/* * copyright (c) 2001 Fabrice Bellard * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef AVCODEC_AVCODEC_H #define AVCODEC_AVCODEC_H /** * @file * external API header */ #include #include "libavutil/samplefmt.h" #include "libavutil/avutil.h" #include "libavutil/cpu.h" #include "libavutil/dict.h" #include "libavutil/log.h" #include "libavutil/pixfmt.h" #include "libavutil/rational.h" #include "libavcodec/version.h" /** * @defgroup libavc Encoding/Decoding Library * @{ * * @defgroup lavc_decoding Decoding * @{ * @} * * @defgroup lavc_encoding Encoding * @{ * @} * * @defgroup lavc_codec Codecs * @{ * @defgroup lavc_codec_native Native Codecs * @{ * @} * @defgroup lavc_codec_wrappers External library wrappers * @{ * @} * @defgroup lavc_codec_hwaccel Hardware Accelerators bridge * @{ * @} * @} * @defgroup lavc_internal Internal * @{ * @} * @} * */ /** * Identify the syntax and semantics of the bitstream. * The principle is roughly: * Two decoders with the same ID can decode the same streams. * Two encoders with the same ID can encode compatible streams. * There may be slight deviations from the principle due to implementation * details. * * If you add a codec ID to this list, add it so that * 1. no value of a existing codec ID changes (that would break ABI), * 2. Give it a value which when taken as ASCII is recognized uniquely by a human as this specific codec. * This ensures that 2 forks can independantly add CodecIDs without producing conflicts. */ enum CodecID { CODEC_ID_NONE, /* video codecs */ CODEC_ID_MPEG1VIDEO, CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding CODEC_ID_MPEG2VIDEO_XVMC, CODEC_ID_H261, CODEC_ID_H263, CODEC_ID_RV10, CODEC_ID_RV20, CODEC_ID_MJPEG, CODEC_ID_MJPEGB, CODEC_ID_LJPEG, CODEC_ID_SP5X, CODEC_ID_JPEGLS, CODEC_ID_MPEG4, CODEC_ID_RAWVIDEO, CODEC_ID_MSMPEG4V1, CODEC_ID_MSMPEG4V2, CODEC_ID_MSMPEG4V3, CODEC_ID_WMV1, CODEC_ID_WMV2, CODEC_ID_H263P, CODEC_ID_H263I, CODEC_ID_FLV1, CODEC_ID_SVQ1, CODEC_ID_SVQ3, CODEC_ID_DVVIDEO, CODEC_ID_HUFFYUV, CODEC_ID_CYUV, CODEC_ID_H264, CODEC_ID_INDEO3, CODEC_ID_VP3, CODEC_ID_THEORA, CODEC_ID_ASV1, CODEC_ID_ASV2, CODEC_ID_FFV1, CODEC_ID_4XM, CODEC_ID_VCR1, CODEC_ID_CLJR, CODEC_ID_MDEC, CODEC_ID_ROQ, CODEC_ID_INTERPLAY_VIDEO, CODEC_ID_XAN_WC3, CODEC_ID_XAN_WC4, CODEC_ID_RPZA, CODEC_ID_CINEPAK, CODEC_ID_WS_VQA, CODEC_ID_MSRLE, CODEC_ID_MSVIDEO1, CODEC_ID_IDCIN, CODEC_ID_8BPS, CODEC_ID_SMC, CODEC_ID_FLIC, CODEC_ID_TRUEMOTION1, CODEC_ID_VMDVIDEO, CODEC_ID_MSZH, CODEC_ID_ZLIB, CODEC_ID_QTRLE, CODEC_ID_SNOW, CODEC_ID_TSCC, CODEC_ID_ULTI, CODEC_ID_QDRAW, CODEC_ID_VIXL, CODEC_ID_QPEG, CODEC_ID_PNG, CODEC_ID_PPM, CODEC_ID_PBM, CODEC_ID_PGM, CODEC_ID_PGMYUV, CODEC_ID_PAM, CODEC_ID_FFVHUFF, CODEC_ID_RV30, CODEC_ID_RV40, CODEC_ID_VC1, CODEC_ID_WMV3, CODEC_ID_LOCO, CODEC_ID_WNV1, CODEC_ID_AASC, CODEC_ID_INDEO2, CODEC_ID_FRAPS, CODEC_ID_TRUEMOTION2, CODEC_ID_BMP, CODEC_ID_CSCD, CODEC_ID_MMVIDEO, CODEC_ID_ZMBV, CODEC_ID_AVS, CODEC_ID_SMACKVIDEO, CODEC_ID_NUV, CODEC_ID_KMVC, CODEC_ID_FLASHSV, CODEC_ID_CAVS, CODEC_ID_JPEG2000, CODEC_ID_VMNC, CODEC_ID_VP5, CODEC_ID_VP6, CODEC_ID_VP6F, CODEC_ID_TARGA, CODEC_ID_DSICINVIDEO, CODEC_ID_TIERTEXSEQVIDEO, CODEC_ID_TIFF, CODEC_ID_GIF, #if LIBAVCODEC_VERSION_MAJOR == 53 CODEC_ID_FFH264, #endif CODEC_ID_DXA, CODEC_ID_DNXHD, CODEC_ID_THP, CODEC_ID_SGI, CODEC_ID_C93, CODEC_ID_BETHSOFTVID, CODEC_ID_PTX, CODEC_ID_TXD, CODEC_ID_VP6A, CODEC_ID_AMV, CODEC_ID_VB, CODEC_ID_PCX, CODEC_ID_SUNRAST, CODEC_ID_INDEO4, CODEC_ID_INDEO5, CODEC_ID_MIMIC, CODEC_ID_RL2, #if LIBAVCODEC_VERSION_MAJOR == 53 CODEC_ID_8SVX_EXP, CODEC_ID_8SVX_FIB, #endif CODEC_ID_ESCAPE124, CODEC_ID_DIRAC, CODEC_ID_BFI, CODEC_ID_CMV, CODEC_ID_MOTIONPIXELS, CODEC_ID_TGV, CODEC_ID_TGQ, CODEC_ID_TQI, CODEC_ID_AURA, CODEC_ID_AURA2, CODEC_ID_V210X, CODEC_ID_TMV, CODEC_ID_V210, CODEC_ID_DPX, CODEC_ID_MAD, CODEC_ID_FRWU, CODEC_ID_FLASHSV2, CODEC_ID_CDGRAPHICS, CODEC_ID_R210, CODEC_ID_ANM, CODEC_ID_BINKVIDEO, CODEC_ID_IFF_ILBM, CODEC_ID_IFF_BYTERUN1, CODEC_ID_KGV1, CODEC_ID_YOP, CODEC_ID_VP8, CODEC_ID_PICTOR, CODEC_ID_ANSI, CODEC_ID_A64_MULTI, CODEC_ID_A64_MULTI5, CODEC_ID_R10K, CODEC_ID_MXPEG, CODEC_ID_LAGARITH, CODEC_ID_PRORES, CODEC_ID_JV, CODEC_ID_DFA, CODEC_ID_WMV3IMAGE, CODEC_ID_VC1IMAGE, #if LIBAVCODEC_VERSION_MAJOR == 53 CODEC_ID_G723_1_DEPRECATED, CODEC_ID_G729_DEPRECATED, #endif CODEC_ID_UTVIDEO_DEPRECATED, CODEC_ID_BMV_VIDEO, CODEC_ID_VBLE, CODEC_ID_DXTORY, CODEC_ID_UTVIDEO = 0x800, CODEC_ID_ESCAPE130 = MKBETAG('E','1','3','0'), CODEC_ID_G2M = MKBETAG( 0 ,'G','2','M'), /* various PCM "codecs" */ CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs CODEC_ID_PCM_S16LE = 0x10000, CODEC_ID_PCM_S16BE, CODEC_ID_PCM_U16LE, CODEC_ID_PCM_U16BE, CODEC_ID_PCM_S8, CODEC_ID_PCM_U8, CODEC_ID_PCM_MULAW, CODEC_ID_PCM_ALAW, CODEC_ID_PCM_S32LE, CODEC_ID_PCM_S32BE, CODEC_ID_PCM_U32LE, CODEC_ID_PCM_U32BE, CODEC_ID_PCM_S24LE, CODEC_ID_PCM_S24BE, CODEC_ID_PCM_U24LE, CODEC_ID_PCM_U24BE, CODEC_ID_PCM_S24DAUD, CODEC_ID_PCM_ZORK, CODEC_ID_PCM_S16LE_PLANAR, CODEC_ID_PCM_DVD, CODEC_ID_PCM_F32BE, CODEC_ID_PCM_F32LE, CODEC_ID_PCM_F64BE, CODEC_ID_PCM_F64LE, CODEC_ID_PCM_BLURAY, CODEC_ID_PCM_LXF, CODEC_ID_S302M, CODEC_ID_PCM_S8_PLANAR, /* various ADPCM codecs */ CODEC_ID_ADPCM_IMA_QT = 0x11000, CODEC_ID_ADPCM_IMA_WAV, CODEC_ID_ADPCM_IMA_DK3, CODEC_ID_ADPCM_IMA_DK4, CODEC_ID_ADPCM_IMA_WS, CODEC_ID_ADPCM_IMA_SMJPEG, CODEC_ID_ADPCM_MS, CODEC_ID_ADPCM_4XM, CODEC_ID_ADPCM_XA, CODEC_ID_ADPCM_ADX, CODEC_ID_ADPCM_EA, CODEC_ID_ADPCM_G726, CODEC_ID_ADPCM_CT, CODEC_ID_ADPCM_SWF, CODEC_ID_ADPCM_YAMAHA, CODEC_ID_ADPCM_SBPRO_4, CODEC_ID_ADPCM_SBPRO_3, CODEC_ID_ADPCM_SBPRO_2, CODEC_ID_ADPCM_THP, CODEC_ID_ADPCM_IMA_AMV, CODEC_ID_ADPCM_EA_R1, CODEC_ID_ADPCM_EA_R3, CODEC_ID_ADPCM_EA_R2, CODEC_ID_ADPCM_IMA_EA_SEAD, CODEC_ID_ADPCM_IMA_EA_EACS, CODEC_ID_ADPCM_EA_XAS, CODEC_ID_ADPCM_EA_MAXIS_XA, CODEC_ID_ADPCM_IMA_ISS, CODEC_ID_ADPCM_G722, /* AMR */ CODEC_ID_AMR_NB = 0x12000, CODEC_ID_AMR_WB, /* RealAudio codecs*/ CODEC_ID_RA_144 = 0x13000, CODEC_ID_RA_288, /* various DPCM codecs */ CODEC_ID_ROQ_DPCM = 0x14000, CODEC_ID_INTERPLAY_DPCM, CODEC_ID_XAN_DPCM, CODEC_ID_SOL_DPCM, /* audio codecs */ CODEC_ID_MP2 = 0x15000, CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3 CODEC_ID_AAC, CODEC_ID_AC3, CODEC_ID_DTS, CODEC_ID_VORBIS, CODEC_ID_DVAUDIO, CODEC_ID_WMAV1, CODEC_ID_WMAV2, CODEC_ID_MACE3, CODEC_ID_MACE6, CODEC_ID_VMDAUDIO, #if LIBAVCODEC_VERSION_MAJOR == 53 CODEC_ID_SONIC, CODEC_ID_SONIC_LS, #endif CODEC_ID_FLAC, CODEC_ID_MP3ADU, CODEC_ID_MP3ON4, CODEC_ID_SHORTEN, CODEC_ID_ALAC, CODEC_ID_WESTWOOD_SND1, CODEC_ID_GSM, ///< as in Berlin toast format CODEC_ID_QDM2, CODEC_ID_COOK, CODEC_ID_TRUESPEECH, CODEC_ID_TTA, CODEC_ID_SMACKAUDIO, CODEC_ID_QCELP, CODEC_ID_WAVPACK, CODEC_ID_DSICINAUDIO, CODEC_ID_IMC, CODEC_ID_MUSEPACK7, CODEC_ID_MLP, CODEC_ID_GSM_MS, /* as found in WAV */ CODEC_ID_ATRAC3, CODEC_ID_VOXWARE, CODEC_ID_APE, CODEC_ID_NELLYMOSER, CODEC_ID_MUSEPACK8, CODEC_ID_SPEEX, CODEC_ID_WMAVOICE, CODEC_ID_WMAPRO, CODEC_ID_WMALOSSLESS, CODEC_ID_ATRAC3P, CODEC_ID_EAC3, CODEC_ID_SIPR, CODEC_ID_MP1, CODEC_ID_TWINVQ, CODEC_ID_TRUEHD, CODEC_ID_MP4ALS, CODEC_ID_ATRAC1, CODEC_ID_BINKAUDIO_RDFT, CODEC_ID_BINKAUDIO_DCT, CODEC_ID_AAC_LATM, CODEC_ID_QDMC, CODEC_ID_CELT, #if LIBAVCODEC_VERSION_MAJOR > 53 CODEC_ID_G723_1_DEPRECATED, CODEC_ID_G729_DEPRECATED, CODEC_ID_8SVX_EXP, CODEC_ID_8SVX_FIB, #endif CODEC_ID_BMV_AUDIO, CODEC_ID_G729 = 0x15800, CODEC_ID_G723_1= 0x15801, CODEC_ID_8SVX_RAW = MKBETAG('8','S','V','X'), /* subtitle codecs */ CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs. CODEC_ID_DVD_SUBTITLE = 0x17000, CODEC_ID_DVB_SUBTITLE, CODEC_ID_TEXT, ///< raw UTF-8 text CODEC_ID_XSUB, CODEC_ID_SSA, CODEC_ID_MOV_TEXT, CODEC_ID_HDMV_PGS_SUBTITLE, CODEC_ID_DVB_TELETEXT, CODEC_ID_SRT, CODEC_ID_MICRODVD = MKBETAG('m','D','V','D'), /* other specific kind of codecs (generally used for attachments) */ CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs. CODEC_ID_TTF = 0x18000, CODEC_ID_BINTEXT = MKBETAG('B','T','X','T'), CODEC_ID_XBIN = MKBETAG('X','B','I','N'), CODEC_ID_IDF = MKBETAG( 0 ,'I','D','F'), CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like CODEC_ID_NONE) but lavf should attempt to identify it CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS * stream (only used by libavformat) */ CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems * stream (only used by libavformat) */ CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information. }; #if FF_API_OLD_SAMPLE_FMT #define SampleFormat AVSampleFormat #define SAMPLE_FMT_NONE AV_SAMPLE_FMT_NONE #define SAMPLE_FMT_U8 AV_SAMPLE_FMT_U8 #define SAMPLE_FMT_S16 AV_SAMPLE_FMT_S16 #define SAMPLE_FMT_S32 AV_SAMPLE_FMT_S32 #define SAMPLE_FMT_FLT AV_SAMPLE_FMT_FLT #define SAMPLE_FMT_DBL AV_SAMPLE_FMT_DBL #define SAMPLE_FMT_NB AV_SAMPLE_FMT_NB #endif #if FF_API_OLD_AUDIOCONVERT #include "libavutil/audioconvert.h" /* Audio channel masks */ #define CH_FRONT_LEFT AV_CH_FRONT_LEFT #define CH_FRONT_RIGHT AV_CH_FRONT_RIGHT #define CH_FRONT_CENTER AV_CH_FRONT_CENTER #define CH_LOW_FREQUENCY AV_CH_LOW_FREQUENCY #define CH_BACK_LEFT AV_CH_BACK_LEFT #define CH_BACK_RIGHT AV_CH_BACK_RIGHT #define CH_FRONT_LEFT_OF_CENTER AV_CH_FRONT_LEFT_OF_CENTER #define CH_FRONT_RIGHT_OF_CENTER AV_CH_FRONT_RIGHT_OF_CENTER #define CH_BACK_CENTER AV_CH_BACK_CENTER #define CH_SIDE_LEFT AV_CH_SIDE_LEFT #define CH_SIDE_RIGHT AV_CH_SIDE_RIGHT #define CH_TOP_CENTER AV_CH_TOP_CENTER #define CH_TOP_FRONT_LEFT AV_CH_TOP_FRONT_LEFT #define CH_TOP_FRONT_CENTER AV_CH_TOP_FRONT_CENTER #define CH_TOP_FRONT_RIGHT AV_CH_TOP_FRONT_RIGHT #define CH_TOP_BACK_LEFT AV_CH_TOP_BACK_LEFT #define CH_TOP_BACK_CENTER AV_CH_TOP_BACK_CENTER #define CH_TOP_BACK_RIGHT AV_CH_TOP_BACK_RIGHT #define CH_STEREO_LEFT AV_CH_STEREO_LEFT #define CH_STEREO_RIGHT AV_CH_STEREO_RIGHT /** Channel mask value used for AVCodecContext.request_channel_layout to indicate that the user requests the channel order of the decoder output to be the native codec channel order. */ #define CH_LAYOUT_NATIVE AV_CH_LAYOUT_NATIVE /* Audio channel convenience macros */ #define CH_LAYOUT_MONO AV_CH_LAYOUT_MONO #define CH_LAYOUT_STEREO AV_CH_LAYOUT_STEREO #define CH_LAYOUT_2_1 AV_CH_LAYOUT_2_1 #define CH_LAYOUT_SURROUND AV_CH_LAYOUT_SURROUND #define CH_LAYOUT_4POINT0 AV_CH_LAYOUT_4POINT0 #define CH_LAYOUT_2_2 AV_CH_LAYOUT_2_2 #define CH_LAYOUT_QUAD AV_CH_LAYOUT_QUAD #define CH_LAYOUT_5POINT0 AV_CH_LAYOUT_5POINT0 #define CH_LAYOUT_5POINT1 AV_CH_LAYOUT_5POINT1 #define CH_LAYOUT_5POINT0_BACK AV_CH_LAYOUT_5POINT0_BACK #define CH_LAYOUT_5POINT1_BACK AV_CH_LAYOUT_5POINT1_BACK #define CH_LAYOUT_7POINT0 AV_CH_LAYOUT_7POINT0 #define CH_LAYOUT_7POINT1 AV_CH_LAYOUT_7POINT1 #define CH_LAYOUT_7POINT1_WIDE AV_CH_LAYOUT_7POINT1_WIDE #define CH_LAYOUT_STEREO_DOWNMIX AV_CH_LAYOUT_STEREO_DOWNMIX #endif #if FF_API_OLD_DECODE_AUDIO /* in bytes */ #define AVCODEC_MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio #endif /** * Required number of additionally allocated bytes at the end of the input bitstream for decoding. * This is mainly needed because some optimized bitstream readers read * 32 or 64 bit at once and could read over the end.
* Note: If the first 23 bits of the additional bytes are not 0, then damaged * MPEG bitstreams could cause overread and segfault. */ #define FF_INPUT_BUFFER_PADDING_SIZE 16 /** * minimum encoding buffer size * Used to avoid some checks during header writing. */ #define FF_MIN_BUFFER_SIZE 16384 /** * motion estimation type. */ enum Motion_Est_ID { ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed ME_FULL, ME_LOG, ME_PHODS, ME_EPZS, ///< enhanced predictive zonal search ME_X1, ///< reserved for experiments ME_HEX, ///< hexagon based search ME_UMH, ///< uneven multi-hexagon search ME_ITER, ///< iterative search ME_TESA, ///< transformed exhaustive search algorithm }; enum AVDiscard{ /* We leave some space between them for extensions (drop some * keyframes for intra-only or drop just some bidir frames). */ AVDISCARD_NONE =-16, ///< discard nothing AVDISCARD_DEFAULT= 0, ///< discard useless packets like 0 size packets in avi AVDISCARD_NONREF = 8, ///< discard all non reference AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes AVDISCARD_ALL = 48, ///< discard all }; enum AVColorPrimaries{ AVCOL_PRI_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B AVCOL_PRI_UNSPECIFIED=2, AVCOL_PRI_BT470M =4, AVCOL_PRI_BT470BG =5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM AVCOL_PRI_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC AVCOL_PRI_SMPTE240M =7, ///< functionally identical to above AVCOL_PRI_FILM =8, AVCOL_PRI_NB , ///< Not part of ABI }; enum AVColorTransferCharacteristic{ AVCOL_TRC_BT709 =1, ///< also ITU-R BT1361 AVCOL_TRC_UNSPECIFIED=2, AVCOL_TRC_GAMMA22 =4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM AVCOL_TRC_GAMMA28 =5, ///< also ITU-R BT470BG AVCOL_TRC_SMPTE240M =7, AVCOL_TRC_NB , ///< Not part of ABI }; enum AVColorSpace{ AVCOL_SPC_RGB =0, AVCOL_SPC_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / SMPTE RP177 Annex B AVCOL_SPC_UNSPECIFIED=2, AVCOL_SPC_FCC =4, AVCOL_SPC_BT470BG =5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM / IEC 61966-2-4 xvYCC601 AVCOL_SPC_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC / functionally identical to above AVCOL_SPC_SMPTE240M =7, AVCOL_SPC_YCGCO =8, AVCOL_SPC_NB , ///< Not part of ABI }; enum AVColorRange{ AVCOL_RANGE_UNSPECIFIED=0, AVCOL_RANGE_MPEG =1, ///< the normal 219*2^(n-8) "MPEG" YUV ranges AVCOL_RANGE_JPEG =2, ///< the normal 2^n-1 "JPEG" YUV ranges AVCOL_RANGE_NB , ///< Not part of ABI }; /** * X X 3 4 X X are luma samples, * 1 2 1-6 are possible chroma positions * X X 5 6 X 0 is undefined/unknown position */ enum AVChromaLocation{ AVCHROMA_LOC_UNSPECIFIED=0, AVCHROMA_LOC_LEFT =1, ///< mpeg2/4, h264 default AVCHROMA_LOC_CENTER =2, ///< mpeg1, jpeg, h263 AVCHROMA_LOC_TOPLEFT =3, ///< DV AVCHROMA_LOC_TOP =4, AVCHROMA_LOC_BOTTOMLEFT =5, AVCHROMA_LOC_BOTTOM =6, AVCHROMA_LOC_NB , ///< Not part of ABI }; #if FF_API_FLAC_GLOBAL_OPTS /** * LPC analysis type */ enum AVLPCType { AV_LPC_TYPE_DEFAULT = -1, ///< use the codec default LPC type AV_LPC_TYPE_NONE = 0, ///< do not use LPC prediction or use all zero coefficients AV_LPC_TYPE_FIXED = 1, ///< fixed LPC coefficients AV_LPC_TYPE_LEVINSON = 2, ///< Levinson-Durbin recursion AV_LPC_TYPE_CHOLESKY = 3, ///< Cholesky factorization AV_LPC_TYPE_NB , ///< Not part of ABI }; #endif enum AVAudioServiceType { AV_AUDIO_SERVICE_TYPE_MAIN = 0, AV_AUDIO_SERVICE_TYPE_EFFECTS = 1, AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2, AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3, AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4, AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5, AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6, AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7, AV_AUDIO_SERVICE_TYPE_KARAOKE = 8, AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI }; typedef struct RcOverride{ int start_frame; int end_frame; int qscale; // If this is 0 then quality_factor will be used instead. float quality_factor; } RcOverride; #define FF_MAX_B_FRAMES 16 /* encoding support These flags can be passed in AVCodecContext.flags before initialization. Note: Not everything is supported yet. */ #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale. #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263. #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC. #define CODEC_FLAG_GMC 0x0020 ///< Use GMC. #define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>. /** * The parent program guarantees that the input for B-frames containing * streams is not written to for at least s->max_b_frames+1 frames, if * this is not set the input will be copied. */ #define CODEC_FLAG_INPUT_PRESERVED 0x0100 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode. #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode. #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale. #define CODEC_FLAG_EMU_EDGE 0x4000 ///< Don't draw edges. #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding. #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random location instead of only at frame boundaries. */ #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization. #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT. #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay. #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe. #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT). /* Fx : Flag for h263+ extra options */ #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction #define CODEC_FLAG_CBP_RD 0x04000000 ///< Use rate distortion optimization for cbp. #define CODEC_FLAG_QP_RD 0x08000000 ///< Use rate distortion optimization for qp selectioon. #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation #define CODEC_FLAG_CLOSED_GOP 0x80000000 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks. #define CODEC_FLAG2_STRICT_GOP 0x00000002 ///< Strictly enforce GOP size. #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding. #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata. #define CODEC_FLAG2_SKIP_RD 0x00004000 ///< RD optimal MB level residual skipping #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries. #define CODEC_FLAG2_SHOW_ALL 0x00400000 ///< Show all frames before the first keyframe /** * @defgroup deprecated_flags Deprecated codec flags * Use corresponding private codec options instead. * @{ */ #if FF_API_MPEGVIDEO_GLOBAL_OPTS #define CODEC_FLAG_OBMC 0x00000001 ///< OBMC #define CODEC_FLAG_H263P_AIV 0x00000008 ///< H.263 alternative inter VLC #define CODEC_FLAG_PART 0x0080 ///< Use data partitioning. #define CODEC_FLAG_ALT_SCAN 0x00100000 ///< Use alternate scan. #define CODEC_FLAG_H263P_UMV 0x02000000 ///< unlimited motion vector #define CODEC_FLAG_H263P_SLICE_STRUCT 0x10000000 #define CODEC_FLAG_SVCD_SCAN_OFFSET 0x40000000 ///< Will reserve space for SVCD scan offset user data. #define CODEC_FLAG2_INTRA_VLC 0x00000800 ///< Use MPEG-2 intra VLC table. #define CODEC_FLAG2_DROP_FRAME_TIMECODE 0x00002000 ///< timecode is in drop frame format. #define CODEC_FLAG2_NON_LINEAR_QUANT 0x00010000 ///< Use MPEG-2 nonlinear quantizer. #endif #if FF_API_MJPEG_GLOBAL_OPTS #define CODEC_FLAG_EXTERN_HUFF 0x1000 ///< Use external Huffman table (for MJPEG). #endif #if FF_API_X264_GLOBAL_OPTS #define CODEC_FLAG2_BPYRAMID 0x00000010 ///< H.264 allow B-frames to be used as references. #define CODEC_FLAG2_WPRED 0x00000020 ///< H.264 weighted biprediction for B-frames #define CODEC_FLAG2_MIXED_REFS 0x00000040 ///< H.264 one reference per partition, as opposed to one reference per macroblock #define CODEC_FLAG2_8X8DCT 0x00000080 ///< H.264 high profile 8x8 transform #define CODEC_FLAG2_FASTPSKIP 0x00000100 ///< H.264 fast pskip #define CODEC_FLAG2_AUD 0x00000200 ///< H.264 access unit delimiters #define CODEC_FLAG2_BRDO 0x00000400 ///< B-frame rate-distortion optimization #define CODEC_FLAG2_MBTREE 0x00040000 ///< Use macroblock tree ratecontrol (x264 only) #define CODEC_FLAG2_PSY 0x00080000 ///< Use psycho visual optimizations. #define CODEC_FLAG2_SSIM 0x00100000 ///< Compute SSIM during encoding, error[] values are undefined. #define CODEC_FLAG2_INTRA_REFRESH 0x00200000 ///< Use periodic insertion of intra blocks instead of keyframes. #endif #if FF_API_SNOW_GLOBAL_OPTS #define CODEC_FLAG2_MEMC_ONLY 0x00001000 ///< Only do ME/MC (I frames -> ref, P frame -> ME+MC). #endif #if FF_API_LAME_GLOBAL_OPTS #define CODEC_FLAG2_BIT_RESERVOIR 0x00020000 ///< Use a bit reservoir when encoding if possible #endif /** * @} */ /* Unsupported options : * Syntax Arithmetic coding (SAC) * Reference Picture Selection * Independent Segment Decoding */ /* /Fx */ /* codec capabilities */ #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback. /** * Codec uses get_buffer() for allocating buffers and supports custom allocators. * If not set, it might not use get_buffer() at all or use operations that * assume the buffer was allocated by avcodec_default_get_buffer. */ #define CODEC_CAP_DR1 0x0002 #if FF_API_PARSE_FRAME /* If 'parse_only' field is true, then avcodec_parse_frame() can be used. */ #define CODEC_CAP_PARSE_ONLY 0x0004 #endif #define CODEC_CAP_TRUNCATED 0x0008 /* Codec can export data for HW decoding (XvMC). */ #define CODEC_CAP_HWACCEL 0x0010 /** * Codec has a nonzero delay and needs to be fed with avpkt->data=NULL, * avpkt->size=0 at the end to get the delayed data until the decoder no longer * returns frames. If this is not set, the codec is guaranteed to never be fed * with NULL data. */ #define CODEC_CAP_DELAY 0x0020 /** * Codec can be fed a final frame with a smaller size. * This can be used to prevent truncation of the last audio samples. */ #define CODEC_CAP_SMALL_LAST_FRAME 0x0040 /** * Codec can export data for HW decoding (VDPAU). */ #define CODEC_CAP_HWACCEL_VDPAU 0x0080 /** * Codec can output multiple frames per AVPacket * Normally demuxers return one frame at a time, demuxers which do not do * are connected to a parser to split what they return into proper frames. * This flag is reserved to the very rare category of codecs which have a * bitstream that cannot be split into frames without timeconsuming * operations like full decoding. Demuxers carring such bitstreams thus * may return multiple frames in a packet. This has many disadvantages like * prohibiting stream copy in many cases thus it should only be considered * as a last resort. */ #define CODEC_CAP_SUBFRAMES 0x0100 /** * Codec is experimental and is thus avoided in favor of non experimental * encoders */ #define CODEC_CAP_EXPERIMENTAL 0x0200 /** * Codec should fill in channel configuration and samplerate instead of container */ #define CODEC_CAP_CHANNEL_CONF 0x0400 /** * Codec is able to deal with negative linesizes */ #define CODEC_CAP_NEG_LINESIZES 0x0800 /** * Codec supports frame-level multithreading. */ #define CODEC_CAP_FRAME_THREADS 0x1000 /** * Codec supports slice-based (or partition-based) multithreading. */ #define CODEC_CAP_SLICE_THREADS 0x2000 /** * Codec is lossless. */ #define CODEC_CAP_LOSSLESS 0x80000000 //The following defines may change, don't expect compatibility if you use them. #define MB_TYPE_INTRA4x4 0x0001 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific #define MB_TYPE_16x16 0x0008 #define MB_TYPE_16x8 0x0010 #define MB_TYPE_8x16 0x0020 #define MB_TYPE_8x8 0x0040 #define MB_TYPE_INTERLACED 0x0080 #define MB_TYPE_DIRECT2 0x0100 //FIXME #define MB_TYPE_ACPRED 0x0200 #define MB_TYPE_GMC 0x0400 #define MB_TYPE_SKIP 0x0800 #define MB_TYPE_P0L0 0x1000 #define MB_TYPE_P1L0 0x2000 #define MB_TYPE_P0L1 0x4000 #define MB_TYPE_P1L1 0x8000 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0) #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1) #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1) #define MB_TYPE_QUANT 0x00010000 #define MB_TYPE_CBP 0x00020000 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...) /** * Pan Scan area. * This specifies the area which should be displayed. * Note there may be multiple such areas for one frame. */ typedef struct AVPanScan{ /** * id * - encoding: Set by user. * - decoding: Set by libavcodec. */ int id; /** * width and height in 1/16 pel * - encoding: Set by user. * - decoding: Set by libavcodec. */ int width; int height; /** * position of the top left corner in 1/16 pel for up to 3 fields/frames * - encoding: Set by user. * - decoding: Set by libavcodec. */ int16_t position[3][2]; }AVPanScan; #define FF_QSCALE_TYPE_MPEG1 0 #define FF_QSCALE_TYPE_MPEG2 1 #define FF_QSCALE_TYPE_H264 2 #define FF_QSCALE_TYPE_VP56 3 #define FF_BUFFER_TYPE_INTERNAL 1 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user) #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared. #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything. #if FF_API_OLD_FF_PICT_TYPES /* DEPRECATED, directly use the AV_PICTURE_TYPE_* enum values */ #define FF_I_TYPE AV_PICTURE_TYPE_I ///< Intra #define FF_P_TYPE AV_PICTURE_TYPE_P ///< Predicted #define FF_B_TYPE AV_PICTURE_TYPE_B ///< Bi-dir predicted #define FF_S_TYPE AV_PICTURE_TYPE_S ///< S(GMC)-VOP MPEG4 #define FF_SI_TYPE AV_PICTURE_TYPE_SI ///< Switching Intra #define FF_SP_TYPE AV_PICTURE_TYPE_SP ///< Switching Predicted #define FF_BI_TYPE AV_PICTURE_TYPE_BI #endif #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore). #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer. #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content. #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update). enum AVPacketSideDataType { AV_PKT_DATA_PALETTE, }; typedef struct AVPacket { /** * Presentation timestamp in AVStream->time_base units; the time at which * the decompressed packet will be presented to the user. * Can be AV_NOPTS_VALUE if it is not stored in the file. * pts MUST be larger or equal to dts as presentation cannot happen before * decompression, unless one wants to view hex dumps. Some formats misuse * the terms dts and pts/cts to mean something different. Such timestamps * must be converted to true pts/dts before they are stored in AVPacket. */ int64_t pts; /** * Decompression timestamp in AVStream->time_base units; the time at which * the packet is decompressed. * Can be AV_NOPTS_VALUE if it is not stored in the file. */ int64_t dts; uint8_t *data; int size; int stream_index; /** * A combination of AV_PKT_FLAG values */ int flags; /** * Additional packet data that can be provided by the container. * Packet can contain several types of side information. */ struct { uint8_t *data; int size; enum AVPacketSideDataType type; } *side_data; int side_data_elems; /** * Duration of this packet in AVStream->time_base units, 0 if unknown. * Equals next_pts - this_pts in presentation order. */ int duration; void (*destruct)(struct AVPacket *); void *priv; int64_t pos; ///< byte position in stream, -1 if unknown /** * Time difference in AVStream->time_base units from the pts of this * packet to the point at which the output from the decoder has converged * independent from the availability of previous frames. That is, the * frames are virtually identical no matter if decoding started from * the very first frame or from this keyframe. * Is AV_NOPTS_VALUE if unknown. * This field is not the display duration of the current packet. * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY * set. * * The purpose of this field is to allow seeking in streams that have no * keyframes in the conventional sense. It corresponds to the * recovery point SEI in H.264 and match_time_delta in NUT. It is also * essential for some types of subtitle streams to ensure that all * subtitles are correctly displayed after seeking. */ int64_t convergence_duration; } AVPacket; #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted /** * Audio Video Frame. * New fields can be added to the end of AVFRAME with minor version * bumps. Similarly fields that are marked as to be only accessed by * av_opt_ptr() can be reordered. This allows 2 forks to add fields * without breaking compatibility with each other. * Removal, reordering and changes in the remaining cases require * a major version bump. * sizeof(AVFrame) must not be used outside libavcodec. */ typedef struct AVFrame { #if FF_API_DATA_POINTERS #define AV_NUM_DATA_POINTERS 4 #else #define AV_NUM_DATA_POINTERS 8 #endif /** * pointer to the picture/channel planes. * This might be different from the first allocated byte * - encoding: Set by user * - decoding: set by AVCodecContext.get_buffer() */ uint8_t *data[AV_NUM_DATA_POINTERS]; /** * Size, in bytes, of the data for each picture/channel plane. * * For audio, only linesize[0] may be set. For planar audio, each channel * plane must be the same size. * * - encoding: Set by user (video only) * - decoding: set by AVCodecContext.get_buffer() */ int linesize[AV_NUM_DATA_POINTERS]; /** * pointer to the first allocated byte of the picture. Can be used in get_buffer/release_buffer. * This isn't used by libavcodec unless the default get/release_buffer() is used. * - encoding: * - decoding: */ uint8_t *base[AV_NUM_DATA_POINTERS]; /** * 1 -> keyframe, 0-> not * - encoding: Set by libavcodec. * - decoding: Set by libavcodec. */ int key_frame; /** * Picture type of the frame, see ?_TYPE below. * - encoding: Set by libavcodec. for coded_picture (and set by user for input). * - decoding: Set by libavcodec. */ enum AVPictureType pict_type; /** * presentation timestamp in time_base units (time when frame should be shown to user) * If AV_NOPTS_VALUE then frame_rate = 1/time_base will be assumed. * - encoding: MUST be set by user. * - decoding: Set by libavcodec. */ int64_t pts; /** * picture number in bitstream order * - encoding: set by * - decoding: Set by libavcodec. */ int coded_picture_number; /** * picture number in display order * - encoding: set by * - decoding: Set by libavcodec. */ int display_picture_number; /** * quality (between 1 (good) and FF_LAMBDA_MAX (bad)) * - encoding: Set by libavcodec. for coded_picture (and set by user for input). * - decoding: Set by libavcodec. */ int quality; /** * buffer age (1->was last buffer and dint change, 2->..., ...). * Set to INT_MAX if the buffer has not been used yet. * - encoding: unused * - decoding: MUST be set by get_buffer() for video. */ int age; /** * is this picture used as reference * The values for this are the same as the MpegEncContext.picture_structure * variable, that is 1->top field, 2->bottom field, 3->frame/both fields. * Set to 4 for delayed, non-reference frames. * - encoding: unused * - decoding: Set by libavcodec. (before get_buffer() call)). */ int reference; /** * QP table * - encoding: unused * - decoding: Set by libavcodec. */ int8_t *qscale_table; /** * QP store stride * - encoding: unused * - decoding: Set by libavcodec. */ int qstride; /** * mbskip_table[mb]>=1 if MB didn't change * stride= mb_width = (width+15)>>4 * - encoding: unused * - decoding: Set by libavcodec. */ uint8_t *mbskip_table; /** * motion vector table * @code * example: * int mv_sample_log2= 4 - motion_subsample_log2; * int mb_width= (width+15)>>4; * int mv_stride= (mb_width << mv_sample_log2) + 1; * motion_val[direction][x + y*mv_stride][0->mv_x, 1->mv_y]; * @endcode * - encoding: Set by user. * - decoding: Set by libavcodec. */ int16_t (*motion_val[2])[2]; /** * macroblock type table * mb_type_base + mb_width + 2 * - encoding: Set by user. * - decoding: Set by libavcodec. */ uint32_t *mb_type; /** * log2 of the size of the block which a single vector in motion_val represents: * (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2) * - encoding: unused * - decoding: Set by libavcodec. */ uint8_t motion_subsample_log2; /** * for some private data of the user * - encoding: unused * - decoding: Set by user. */ void *opaque; /** * error * - encoding: Set by libavcodec. if flags&CODEC_FLAG_PSNR. * - decoding: unused */ uint64_t error[AV_NUM_DATA_POINTERS]; /** * type of the buffer (to keep track of who has to deallocate data[*]) * - encoding: Set by the one who allocates it. * - decoding: Set by the one who allocates it. * Note: User allocated (direct rendering) & internal buffers cannot coexist currently. */ int type; /** * When decoding, this signals how much the picture must be delayed. * extra_delay = repeat_pict / (2*fps) * - encoding: unused * - decoding: Set by libavcodec. */ int repeat_pict; /** * */ int qscale_type; /** * The content of the picture is interlaced. * - encoding: Set by user. * - decoding: Set by libavcodec. (default 0) */ int interlaced_frame; /** * If the content is interlaced, is top field displayed first. * - encoding: Set by user. * - decoding: Set by libavcodec. */ int top_field_first; /** * Pan scan. * - encoding: Set by user. * - decoding: Set by libavcodec. */ AVPanScan *pan_scan; /** * Tell user application that palette has changed from previous frame. * - encoding: ??? (no palette-enabled encoder yet) * - decoding: Set by libavcodec. (default 0). */ int palette_has_changed; /** * codec suggestion on buffer type if != 0 * - encoding: unused * - decoding: Set by libavcodec. (before get_buffer() call)). */ int buffer_hints; /** * DCT coefficients * - encoding: unused * - decoding: Set by libavcodec. */ short *dct_coeff; /** * motion reference frame index * the order in which these are stored can depend on the codec. * - encoding: Set by user. * - decoding: Set by libavcodec. */ int8_t *ref_index[2]; /** * reordered opaque 64bit (generally an integer or a double precision float * PTS but can be anything). * The user sets AVCodecContext.reordered_opaque to represent the input at * that time, * the decoder reorders values as needed and sets AVFrame.reordered_opaque * to exactly one of the values provided by the user through AVCodecContext.reordered_opaque * @deprecated in favor of pkt_pts * - encoding: unused * - decoding: Read by user. */ int64_t reordered_opaque; /** * hardware accelerator private data (FFmpeg-allocated) * - encoding: unused * - decoding: Set by libavcodec */ void *hwaccel_picture_private; /** * reordered pts from the last AVPacket that has been input into the decoder * - encoding: unused * - decoding: Read by user. */ int64_t pkt_pts; /** * dts from the last AVPacket that has been input into the decoder * - encoding: unused * - decoding: Read by user. */ int64_t pkt_dts; /** * the AVCodecContext which ff_thread_get_buffer() was last called on * - encoding: Set by libavcodec. * - decoding: Set by libavcodec. */ struct AVCodecContext *owner; /** * used by multithreading to store frame-specific info * - encoding: Set by libavcodec. * - decoding: Set by libavcodec. */ void *thread_opaque; /** * number of audio samples (per channel) described by this frame * - encoding: unused * - decoding: Set by libavcodec */ int nb_samples; /** * pointers to the data planes/channels. * * For video, this should simply point to data[]. * * For planar audio, each channel has a separate data pointer, and * linesize[0] contains the size of each channel buffer. * For packed audio, there is just one data pointer, and linesize[0] * contains the total size of the buffer for all channels. * * Note: Both data and extended_data will always be set by get_buffer(), * but for planar audio with more channels that can fit in data, * extended_data must be used by the decoder in order to access all * channels. * * encoding: unused * decoding: set by AVCodecContext.get_buffer() */ uint8_t **extended_data; /** * frame timestamp estimated using various heuristics, in stream time base * Code outside libavcodec should access this field using: * av_opt_ptr(avcodec_get_frame_class(), frame, "best_effort_timestamp"); * - encoding: unused * - decoding: set by libavcodec, read by user. */ int64_t best_effort_timestamp; /** * reordered pos from the last AVPacket that has been input into the decoder * Code outside libavcodec should access this field using: * av_opt_ptr(avcodec_get_frame_class(), frame, "pkt_pos"); * - encoding: unused * - decoding: Read by user. */ int64_t pkt_pos; /** * reordered sample aspect ratio for the video frame, 0/1 if unknown\unspecified * Code outside libavcodec should access this field using: * av_opt_ptr(avcodec_get_frame_class(), frame, "sample_aspect_ratio"); * - encoding: unused * - decoding: Read by user. */ AVRational sample_aspect_ratio; /** * width and height of the video frame * Code outside libavcodec should access this field using: * av_opt_ptr(avcodec_get_frame_class(), frame, "width"); * - encoding: unused * - decoding: Read by user. */ int width, height; /** * format of the frame, -1 if unknown or unset * It should be cast to the corresponding enum (enum PixelFormat * for video, enum AVSampleFormat for audio) * Code outside libavcodec should access this field using: * av_opt_ptr(avcodec_get_frame_class(), frame, "format"); * - encoding: unused * - decoding: Read by user. */ int format; } AVFrame; struct AVCodecInternal; /** * main external API structure. * New fields can be added to the end with minor version bumps. * Removal, reordering and changes to existing fields require a major * version bump. * Please use AVOptions (av_opt* / av_set/get*()) to access these fields from user * applications. * sizeof(AVCodecContext) must not be used outside libav*. */ typedef struct AVCodecContext { /** * information on struct for av_log * - set by avcodec_alloc_context3 */ const AVClass *av_class; /** * the average bitrate * - encoding: Set by user; unused for constant quantizer encoding. * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream. */ int bit_rate; /** * number of bits the bitstream is allowed to diverge from the reference. * the reference can be CBR (for CBR pass1) or VBR (for pass2) * - encoding: Set by user; unused for constant quantizer encoding. * - decoding: unused */ int bit_rate_tolerance; /** * CODEC_FLAG_*. * - encoding: Set by user. * - decoding: Set by user. */ int flags; /** * Some codecs need additional format info. It is stored here. * If any muxer uses this then ALL demuxers/parsers AND encoders for the * specific codec MUST set it correctly otherwise stream copy breaks. * In general use of this field by muxers is not recommended. * - encoding: Set by libavcodec. * - decoding: Set by libavcodec. (FIXME: Is this OK?) */ int sub_id; /** * Motion estimation algorithm used for video coding. * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex), * 8 (umh), 9 (iter), 10 (tesa) [7, 8, 10 are x264 specific, 9 is snow specific] * - encoding: MUST be set by user. * - decoding: unused */ int me_method; /** * some codecs need / can use extradata like Huffman tables. * mjpeg: Huffman tables * rv10: additional flags * mpeg4: global headers (they can be in the bitstream or here) * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger * than extradata_size to avoid prolems if it is read with the bitstream reader. * The bytewise contents of extradata must not depend on the architecture or CPU endianness. * - encoding: Set/allocated/freed by libavcodec. * - decoding: Set/allocated/freed by user. */ uint8_t *extradata; int extradata_size; /** * This is the fundamental unit of time (in seconds) in terms * of which frame timestamps are represented. For fixed-fps content, * timebase should be 1/framerate and timestamp increments should be * identically 1. * - encoding: MUST be set by user. * - decoding: Set by libavcodec. */ AVRational time_base; /* video only */ /** * picture width / height. * - encoding: MUST be set by user. * - decoding: Set by libavcodec. * Note: For compatibility it is possible to set this instead of * coded_width/height before decoding. */ int width, height; #define FF_ASPECT_EXTENDED 15 /** * the number of pictures in a group of pictures, or 0 for intra_only * - encoding: Set by user. * - decoding: unused */ int gop_size; /** * Pixel format, see PIX_FMT_xxx. * May be set by the demuxer if known from headers. * May be overriden by the decoder if it knows better. * - encoding: Set by user. * - decoding: Set by user if known, overridden by libavcodec if known */ enum PixelFormat pix_fmt; /** * If non NULL, 'draw_horiz_band' is called by the libavcodec * decoder to draw a horizontal band. It improves cache usage. Not * all codecs can do that. You must check the codec capabilities * beforehand. * When multithreading is used, it may be called from multiple threads * at the same time; threads might draw different parts of the same AVFrame, * or multiple AVFrames, and there is no guarantee that slices will be drawn * in order. * The function is also used by hardware acceleration APIs. * It is called at least once during frame decoding to pass * the data needed for hardware render. * In that mode instead of pixel data, AVFrame points to * a structure specific to the acceleration API. The application * reads the structure and can change some fields to indicate progress * or mark state. * - encoding: unused * - decoding: Set by user. * @param height the height of the slice * @param y the y position of the slice * @param type 1->top field, 2->bottom field, 3->frame * @param offset offset into the AVFrame.data from which the slice should be read */ void (*draw_horiz_band)(struct AVCodecContext *s, const AVFrame *src, int offset[AV_NUM_DATA_POINTERS], int y, int type, int height); /* audio only */ int sample_rate; ///< samples per second int channels; ///< number of audio channels /** * audio sample format * - encoding: Set by user. * - decoding: Set by libavcodec. */ enum AVSampleFormat sample_fmt; ///< sample format /* The following data should not be initialized. */ /** * Samples per packet, initialized when calling 'init'. */ int frame_size; int frame_number; ///< audio or video frame number /** * Encoding: Number of frames delay there will be from the encoder input to * the decoder output. (we assume the decoder matches the spec) * Decoding: Number of frames delay in addition to what a standard decoder * as specified in the spec would produce. * - encoding: Set by libavcodec. * - decoding: Set by libavcodec. */ int delay; /* - encoding parameters */ float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0) float qblur; ///< amount of qscale smoothing over time (0.0-1.0) /** * minimum quantizer * - encoding: Set by user. * - decoding: unused */ int qmin; /** * maximum quantizer * - encoding: Set by user. * - decoding: unused */ int qmax; /** * maximum quantizer difference between frames * - encoding: Set by user. * - decoding: unused */ int max_qdiff; /** * maximum number of B-frames between non-B-frames * Note: The output will be delayed by max_b_frames+1 relative to the input. * - encoding: Set by user. * - decoding: unused */ int max_b_frames; /** * qscale factor between IP and B-frames * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset). * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset). * - encoding: Set by user. * - decoding: unused */ float b_quant_factor; /** obsolete FIXME remove */ int rc_strategy; #define FF_RC_STRATEGY_XVID 1 int b_frame_strategy; struct AVCodec *codec; void *priv_data; int rtp_payload_size; /* The size of the RTP payload: the coder will */ /* do its best to deliver a chunk with size */ /* below rtp_payload_size, the chunk will start */ /* with a start code on some codecs like H.263. */ /* This doesn't take account of any particular */ /* headers inside the transmitted RTP payload. */ /* The RTP callback: This function is called */ /* every time the encoder has a packet to send. */ /* It depends on the encoder if the data starts */ /* with a Start Code (it should). H.263 does. */ /* mb_nb contains the number of macroblocks */ /* encoded in the RTP payload. */ void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb); /* statistics, used for 2-pass encoding */ int mv_bits; int header_bits; int i_tex_bits; int p_tex_bits; int i_count; int p_count; int skip_count; int misc_bits; /** * number of bits used for the previously encoded frame * - encoding: Set by libavcodec. * - decoding: unused */ int frame_bits; /** * Private data of the user, can be used to carry app specific stuff. * - encoding: Set by user. * - decoding: Set by user. */ void *opaque; char codec_name[32]; enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */ enum CodecID codec_id; /* see CODEC_ID_xxx */ /** * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A'). * This is used to work around some encoder bugs. * A demuxer should set this to what is stored in the field used to identify the codec. * If there are multiple such fields in a container then the demuxer should choose the one * which maximizes the information about the used codec. * If the codec tag field in a container is larger than 32 bits then the demuxer should * remap the longer ID to 32 bits with a table or other structure. Alternatively a new * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated * first. * - encoding: Set by user, if not then the default based on codec_id will be used. * - decoding: Set by user, will be converted to uppercase by libavcodec during init. */ unsigned int codec_tag; /** * Work around bugs in encoders which sometimes cannot be detected automatically. * - encoding: Set by user * - decoding: Set by user */ int workaround_bugs; #define FF_BUG_AUTODETECT 1 ///< autodetection #define FF_BUG_OLD_MSMPEG4 2 #define FF_BUG_XVID_ILACE 4 #define FF_BUG_UMP4 8 #define FF_BUG_NO_PADDING 16 #define FF_BUG_AMV 32 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default. #define FF_BUG_QPEL_CHROMA 64 #define FF_BUG_STD_QPEL 128 #define FF_BUG_QPEL_CHROMA2 256 #define FF_BUG_DIRECT_BLOCKSIZE 512 #define FF_BUG_EDGE 1024 #define FF_BUG_HPEL_CHROMA 2048 #define FF_BUG_DC_CLIP 4096 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders. #define FF_BUG_TRUNCATED 16384 //#define FF_BUG_FAKE_SCALABILITY 16 //Autodetection should work 100%. /** * luma single coefficient elimination threshold * - encoding: Set by user. * - decoding: unused */ int luma_elim_threshold; /** * chroma single coeff elimination threshold * - encoding: Set by user. * - decoding: unused */ int chroma_elim_threshold; /** * strictly follow the standard (MPEG4, ...). * - encoding: Set by user. * - decoding: Set by user. * Setting this to STRICT or higher means the encoder and decoder will * generally do stupid things, whereas setting it to unofficial or lower * will mean the encoder might produce output that is not supported by all * spec-compliant decoders. Decoders don't differentiate between normal, * unofficial and experimental (that is, they always try to decode things * when they can) unless they are explicitly asked to behave stupidly * (=strictly conform to the specs) */ int strict_std_compliance; #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software. #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences. #define FF_COMPLIANCE_NORMAL 0 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things. /** * qscale offset between IP and B-frames * - encoding: Set by user. * - decoding: unused */ float b_quant_offset; #if FF_API_ER /** * Error recognition; higher values will detect more errors but may * misdetect some more or less valid parts as errors. * - encoding: unused * - decoding: Set by user. */ attribute_deprecated int error_recognition; #define FF_ER_CAREFUL 1 #define FF_ER_COMPLIANT 2 #define FF_ER_AGGRESSIVE 3 #define FF_ER_VERY_AGGRESSIVE 4 #define FF_ER_EXPLODE 5 #endif /* FF_API_ER */ /** * Called at the beginning of each frame to get a buffer for it. * * The function will set AVFrame.data[], AVFrame.linesize[]. * AVFrame.extended_data[] must also be set, but it should be the same as * AVFrame.data[] except for planar audio with more channels than can fit * in AVFrame.data[]. In that case, AVFrame.data[] shall still contain as * many data pointers as it can hold. * * if CODEC_CAP_DR1 is not set then get_buffer() must call * avcodec_default_get_buffer() instead of providing buffers allocated by * some other means. * * AVFrame.data[] should be 32- or 16-byte-aligned unless the CPU doesn't * need it. avcodec_default_get_buffer() aligns the output buffer properly, * but if get_buffer() is overridden then alignment considerations should * be taken into account. * * @see avcodec_default_get_buffer() * * Video: * * If pic.reference is set then the frame will be read later by libavcodec. * avcodec_align_dimensions2() should be used to find the required width and * height, as they normally need to be rounded up to the next multiple of 16. * * If frame multithreading is used and thread_safe_callbacks is set, * it may be called from a different thread, but not from more than one at * once. Does not need to be reentrant. * * @see release_buffer(), reget_buffer() * @see avcodec_align_dimensions2() * * Audio: * * Decoders request a buffer of a particular size by setting * AVFrame.nb_samples prior to calling get_buffer(). The decoder may, * however, utilize only part of the buffer by setting AVFrame.nb_samples * to a smaller value in the output frame. * * Decoders cannot use the buffer after returning from * avcodec_decode_audio4(), so they will not call release_buffer(), as it * is assumed to be released immediately upon return. * * As a convenience, av_samples_get_buffer_size() and * av_samples_fill_arrays() in libavutil may be used by custom get_buffer() * functions to find the required data size and to fill data pointers and * linesize. In AVFrame.linesize, only linesize[0] may be set for audio * since all planes must be the same size. * * @see av_samples_get_buffer_size(), av_samples_fill_arrays() * * - encoding: unused * - decoding: Set by libavcodec, user can override. */ int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic); /** * Called to release buffers which were allocated with get_buffer. * A released buffer can be reused in get_buffer(). * pic.data[*] must be set to NULL. * May be called from a different thread if frame multithreading is used, * but not by more than one thread at once, so does not need to be reentrant. * - encoding: unused * - decoding: Set by libavcodec, user can override. */ void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic); /** * Size of the frame reordering buffer in the decoder. * For MPEG-2 it is 1 IPB or 0 low delay IP. * - encoding: Set by libavcodec. * - decoding: Set by libavcodec. */ int has_b_frames; /** * number of bytes per packet if constant and known or 0 * Used by some WAV based audio codecs. */ int block_align; #if FF_API_PARSE_FRAME /** * If true, only parsing is done. The frame data is returned. * Only MPEG audio decoders support this now. * - encoding: unused * - decoding: Set by user */ attribute_deprecated int parse_only; #endif /** * 0-> h263 quant 1-> mpeg quant * - encoding: Set by user. * - decoding: unused */ int mpeg_quant; /** * pass1 encoding statistics output buffer * - encoding: Set by libavcodec. * - decoding: unused */ char *stats_out; /** * pass2 encoding statistics input buffer * Concatenated stuff from stats_out of pass1 should be placed here. * - encoding: Allocated/set/freed by user. * - decoding: unused */ char *stats_in; /** * ratecontrol qmin qmax limiting method * 0-> clipping, 1-> use a nice continous function to limit qscale wthin qmin/qmax. * - encoding: Set by user. * - decoding: unused */ float rc_qsquish; float rc_qmod_amp; int rc_qmod_freq; /** * ratecontrol override, see RcOverride * - encoding: Allocated/set/freed by user. * - decoding: unused */ RcOverride *rc_override; int rc_override_count; /** * rate control equation * - encoding: Set by user * - decoding: unused */ const char *rc_eq; /** * maximum bitrate * - encoding: Set by user. * - decoding: unused */ int rc_max_rate; /** * minimum bitrate * - encoding: Set by user. * - decoding: unused */ int rc_min_rate; /** * decoder bitstream buffer size * - encoding: Set by user. * - decoding: unused */ int rc_buffer_size; float rc_buffer_aggressivity; /** * qscale factor between P and I-frames * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset). * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset). * - encoding: Set by user. * - decoding: unused */ float i_quant_factor; /** * qscale offset between P and I-frames * - encoding: Set by user. * - decoding: unused */ float i_quant_offset; /** * initial complexity for pass1 ratecontrol * - encoding: Set by user. * - decoding: unused */ float rc_initial_cplx; /** * DCT algorithm, see FF_DCT_* below * - encoding: Set by user. * - decoding: unused */ int dct_algo; #define FF_DCT_AUTO 0 #define FF_DCT_FASTINT 1 #define FF_DCT_INT 2 #define FF_DCT_MMX 3 #define FF_DCT_MLIB 4 #define FF_DCT_ALTIVEC 5 #define FF_DCT_FAAN 6 /** * luminance masking (0-> disabled) * - encoding: Set by user. * - decoding: unused */ float lumi_masking; /** * temporary complexity masking (0-> disabled) * - encoding: Set by user. * - decoding: unused */ float temporal_cplx_masking; /** * spatial complexity masking (0-> disabled) * - encoding: Set by user. * - decoding: unused */ float spatial_cplx_masking; /** * p block masking (0-> disabled) * - encoding: Set by user. * - decoding: unused */ float p_masking; /** * darkness masking (0-> disabled) * - encoding: Set by user. * - decoding: unused */ float dark_masking; /** * IDCT algorithm, see FF_IDCT_* below. * - encoding: Set by user. * - decoding: Set by user. */ int idct_algo; #define FF_IDCT_AUTO 0 #define FF_IDCT_INT 1 #define FF_IDCT_SIMPLE 2 #define FF_IDCT_SIMPLEMMX 3 #define FF_IDCT_LIBMPEG2MMX 4 #define FF_IDCT_PS2 5 #define FF_IDCT_MLIB 6 #define FF_IDCT_ARM 7 #define FF_IDCT_ALTIVEC 8 #define FF_IDCT_SH4 9 #define FF_IDCT_SIMPLEARM 10 #define FF_IDCT_H264 11 #define FF_IDCT_VP3 12 #define FF_IDCT_IPP 13 #define FF_IDCT_XVIDMMX 14 #define FF_IDCT_CAVS 15 #define FF_IDCT_SIMPLEARMV5TE 16 #define FF_IDCT_SIMPLEARMV6 17 #define FF_IDCT_SIMPLEVIS 18 #define FF_IDCT_WMV2 19 #define FF_IDCT_FAAN 20 #define FF_IDCT_EA 21 #define FF_IDCT_SIMPLENEON 22 #define FF_IDCT_SIMPLEALPHA 23 #define FF_IDCT_BINK 24 /** * slice count * - encoding: Set by libavcodec. * - decoding: Set by user (or 0). */ int slice_count; /** * slice offsets in the frame in bytes * - encoding: Set/allocated by libavcodec. * - decoding: Set/allocated by user (or NULL). */ int *slice_offset; /** * error concealment flags * - encoding: unused * - decoding: Set by user. */ int error_concealment; #define FF_EC_GUESS_MVS 1 #define FF_EC_DEBLOCK 2 /** * dsp_mask could be add used to disable unwanted CPU features * CPU features (i.e. MMX, SSE. ...) * * With the FORCE flag you may instead enable given CPU features. * (Dangerous: Usable in case of misdetection, improper usage however will * result into program crash.) */ unsigned dsp_mask; /** * bits per sample/pixel from the demuxer (needed for huffyuv). * - encoding: Set by libavcodec. * - decoding: Set by user. */ int bits_per_coded_sample; /** * prediction method (needed for huffyuv) * - encoding: Set by user. * - decoding: unused */ int prediction_method; #define FF_PRED_LEFT 0 #define FF_PRED_PLANE 1 #define FF_PRED_MEDIAN 2 /** * sample aspect ratio (0 if unknown) * That is the width of a pixel divided by the height of the pixel. * Numerator and denominator must be relatively prime and smaller than 256 for some video standards. * - encoding: Set by user. * - decoding: Set by libavcodec. */ AVRational sample_aspect_ratio; /** * the picture in the bitstream * - encoding: Set by libavcodec. * - decoding: Set by libavcodec. */ AVFrame *coded_frame; /** * debug * - encoding: Set by user. * - decoding: Set by user. */ int debug; #define FF_DEBUG_PICT_INFO 1 #define FF_DEBUG_RC 2 #define FF_DEBUG_BITSTREAM 4 #define FF_DEBUG_MB_TYPE 8 #define FF_DEBUG_QP 16 #define FF_DEBUG_MV 32 #define FF_DEBUG_DCT_COEFF 0x00000040 #define FF_DEBUG_SKIP 0x00000080 #define FF_DEBUG_STARTCODE 0x00000100 #define FF_DEBUG_PTS 0x00000200 #define FF_DEBUG_ER 0x00000400 #define FF_DEBUG_MMCO 0x00000800 #define FF_DEBUG_BUGS 0x00001000 #define FF_DEBUG_VIS_QP 0x00002000 #define FF_DEBUG_VIS_MB_TYPE 0x00004000 #define FF_DEBUG_BUFFERS 0x00008000 #define FF_DEBUG_THREADS 0x00010000 /** * debug * - encoding: Set by user. * - decoding: Set by user. */ int debug_mv; #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames /** * error * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR. * - decoding: unused */ uint64_t error[AV_NUM_DATA_POINTERS]; /** * motion estimation comparison function * - encoding: Set by user. * - decoding: unused */ int me_cmp; /** * subpixel motion estimation comparison function * - encoding: Set by user. * - decoding: unused */ int me_sub_cmp; /** * macroblock comparison function (not supported yet) * - encoding: Set by user. * - decoding: unused */ int mb_cmp; /** * interlaced DCT comparison function * - encoding: Set by user. * - decoding: unused */ int ildct_cmp; #define FF_CMP_SAD 0 #define FF_CMP_SSE 1 #define FF_CMP_SATD 2 #define FF_CMP_DCT 3 #define FF_CMP_PSNR 4 #define FF_CMP_BIT 5 #define FF_CMP_RD 6 #define FF_CMP_ZERO 7 #define FF_CMP_VSAD 8 #define FF_CMP_VSSE 9 #define FF_CMP_NSSE 10 #define FF_CMP_W53 11 #define FF_CMP_W97 12 #define FF_CMP_DCTMAX 13 #define FF_CMP_DCT264 14 #define FF_CMP_CHROMA 256 /** * ME diamond size & shape * - encoding: Set by user. * - decoding: unused */ int dia_size; /** * amount of previous MV predictors (2a+1 x 2a+1 square) * - encoding: Set by user. * - decoding: unused */ int last_predictor_count; /** * prepass for motion estimation * - encoding: Set by user. * - decoding: unused */ int pre_me; /** * motion estimation prepass comparison function * - encoding: Set by user. * - decoding: unused */ int me_pre_cmp; /** * ME prepass diamond size & shape * - encoding: Set by user. * - decoding: unused */ int pre_dia_size; /** * subpel ME quality * - encoding: Set by user. * - decoding: unused */ int me_subpel_quality; /** * callback to negotiate the pixelFormat * @param fmt is the list of formats which are supported by the codec, * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality. * The first is always the native one. * @return the chosen format * - encoding: unused * - decoding: Set by user, if not set the native format will be chosen. */ enum PixelFormat (*get_format)(struct AVCodecContext *s, const enum PixelFormat * fmt); /** * DTG active format information (additional aspect ratio * information only used in DVB MPEG-2 transport streams) * 0 if not set. * * - encoding: unused * - decoding: Set by decoder. */ int dtg_active_format; #define FF_DTG_AFD_SAME 8 #define FF_DTG_AFD_4_3 9 #define FF_DTG_AFD_16_9 10 #define FF_DTG_AFD_14_9 11 #define FF_DTG_AFD_4_3_SP_14_9 13 #define FF_DTG_AFD_16_9_SP_14_9 14 #define FF_DTG_AFD_SP_4_3 15 /** * maximum motion estimation search range in subpel units * If 0 then no limit. * * - encoding: Set by user. * - decoding: unused */ int me_range; /** * intra quantizer bias * - encoding: Set by user. * - decoding: unused */ int intra_quant_bias; #define FF_DEFAULT_QUANT_BIAS 999999 /** * inter quantizer bias * - encoding: Set by user. * - decoding: unused */ int inter_quant_bias; /** * color table ID * - encoding: unused * - decoding: Which clrtable should be used for 8bit RGB images. * Tables have to be stored somewhere. FIXME */ int color_table_id; #if FF_API_INTERNAL_CONTEXT /** * internal_buffer count * Don't touch, used by libavcodec default_get_buffer(). * @deprecated this field was moved to an internal context */ attribute_deprecated int internal_buffer_count; /** * internal_buffers * Don't touch, used by libavcodec default_get_buffer(). * @deprecated this field was moved to an internal context */ attribute_deprecated void *internal_buffer; #endif /** * Global quality for codecs which cannot change it per frame. * This should be proportional to MPEG-1/2/4 qscale. * - encoding: Set by user. * - decoding: unused */ int global_quality; #define FF_CODER_TYPE_VLC 0 #define FF_CODER_TYPE_AC 1 #define FF_CODER_TYPE_RAW 2 #define FF_CODER_TYPE_RLE 3 #define FF_CODER_TYPE_DEFLATE 4 /** * coder type * - encoding: Set by user. * - decoding: unused */ int coder_type; /** * context model * - encoding: Set by user. * - decoding: unused */ int context_model; #if 0 /** * * - encoding: unused * - decoding: Set by user. */ uint8_t * (*realloc)(struct AVCodecContext *s, uint8_t *buf, int buf_size); #endif /** * slice flags * - encoding: unused * - decoding: Set by user. */ int slice_flags; #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics) #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1) /** * XVideo Motion Acceleration * - encoding: forbidden * - decoding: set by decoder */ int xvmc_acceleration; /** * macroblock decision mode * - encoding: Set by user. * - decoding: unused */ int mb_decision; #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits #define FF_MB_DECISION_RD 2 ///< rate distortion /** * custom intra quantization matrix * - encoding: Set by user, can be NULL. * - decoding: Set by libavcodec. */ uint16_t *intra_matrix; /** * custom inter quantization matrix * - encoding: Set by user, can be NULL. * - decoding: Set by libavcodec. */ uint16_t *inter_matrix; /** * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A'). * This is used to work around some encoder bugs. * - encoding: unused * - decoding: Set by user, will be converted to uppercase by libavcodec during init. */ unsigned int stream_codec_tag; /** * scene change detection threshold * 0 is default, larger means fewer detected scene changes. * - encoding: Set by user. * - decoding: unused */ int scenechange_threshold; /** * minimum Lagrange multipler * - encoding: Set by user. * - decoding: unused */ int lmin; /** * maximum Lagrange multipler * - encoding: Set by user. * - decoding: unused */ int lmax; #if FF_API_PALETTE_CONTROL /** * palette control structure * - encoding: ??? (no palette-enabled encoder yet) * - decoding: Set by user. */ struct AVPaletteControl *palctrl; #endif /** * noise reduction strength * - encoding: Set by user. * - decoding: unused */ int noise_reduction; /** * Called at the beginning of a frame to get cr buffer for it. * Buffer type (size, hints) must be the same. libavcodec won't check it. * libavcodec will pass previous buffer in pic, function should return * same buffer or new buffer with old frame "painted" into it. * If pic.data[0] == NULL must behave like get_buffer(). * if CODEC_CAP_DR1 is not set then reget_buffer() must call * avcodec_default_reget_buffer() instead of providing buffers allocated by * some other means. * - encoding: unused * - decoding: Set by libavcodec, user can override. */ int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic); /** * Number of bits which should be loaded into the rc buffer before decoding starts. * - encoding: Set by user. * - decoding: unused */ int rc_initial_buffer_occupancy; /** * * - encoding: Set by user. * - decoding: unused */ int inter_threshold; /** * CODEC_FLAG2_* * - encoding: Set by user. * - decoding: Set by user. */ int flags2; /** * Simulates errors in the bitstream to test error concealment. * - encoding: Set by user. * - decoding: unused */ int error_rate; #if FF_API_ANTIALIAS_ALGO /** * MP3 antialias algorithm, see FF_AA_* below. * - encoding: unused * - decoding: Set by user. */ attribute_deprecated int antialias_algo; #define FF_AA_AUTO 0 #define FF_AA_FASTINT 1 //not implemented yet #define FF_AA_INT 2 #define FF_AA_FLOAT 3 #endif /** * quantizer noise shaping * - encoding: Set by user. * - decoding: unused */ int quantizer_noise_shaping; /** * thread count * is used to decide how many independent tasks should be passed to execute() * - encoding: Set by user. * - decoding: Set by user. */ int thread_count; /** * The codec may call this to execute several independent things. * It will return only after finishing all tasks. * The user may replace this with some multithreaded implementation, * the default implementation will execute the parts serially. * @param count the number of things to execute * - encoding: Set by libavcodec, user can override. * - decoding: Set by libavcodec, user can override. */ int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size); /** * thread opaque * Can be used by execute() to store some per AVCodecContext stuff. * - encoding: set by execute() * - decoding: set by execute() */ void *thread_opaque; /** * Motion estimation threshold below which no motion estimation is * performed, but instead the user specified motion vectors are used. * * - encoding: Set by user. * - decoding: unused */ int me_threshold; /** * Macroblock threshold below which the user specified macroblock types will be used. * - encoding: Set by user. * - decoding: unused */ int mb_threshold; /** * precision of the intra DC coefficient - 8 * - encoding: Set by user. * - decoding: unused */ int intra_dc_precision; /** * noise vs. sse weight for the nsse comparsion function * - encoding: Set by user. * - decoding: unused */ int nsse_weight; /** * Number of macroblock rows at the top which are skipped. * - encoding: unused * - decoding: Set by user. */ int skip_top; /** * Number of macroblock rows at the bottom which are skipped. * - encoding: unused * - decoding: Set by user. */ int skip_bottom; /** * profile * - encoding: Set by user. * - decoding: Set by libavcodec. */ int profile; #define FF_PROFILE_UNKNOWN -99 #define FF_PROFILE_RESERVED -100 #define FF_PROFILE_AAC_MAIN 0 #define FF_PROFILE_AAC_LOW 1 #define FF_PROFILE_AAC_SSR 2 #define FF_PROFILE_AAC_LTP 3 #define FF_PROFILE_DTS 20 #define FF_PROFILE_DTS_ES 30 #define FF_PROFILE_DTS_96_24 40 #define FF_PROFILE_DTS_HD_HRA 50 #define FF_PROFILE_DTS_HD_MA 60 #define FF_PROFILE_MPEG2_422 0 #define FF_PROFILE_MPEG2_HIGH 1 #define FF_PROFILE_MPEG2_SS 2 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3 #define FF_PROFILE_MPEG2_MAIN 4 #define FF_PROFILE_MPEG2_SIMPLE 5 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag #define FF_PROFILE_H264_BASELINE 66 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED) #define FF_PROFILE_H264_MAIN 77 #define FF_PROFILE_H264_EXTENDED 88 #define FF_PROFILE_H264_HIGH 100 #define FF_PROFILE_H264_HIGH_10 110 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA) #define FF_PROFILE_H264_HIGH_422 122 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA) #define FF_PROFILE_H264_HIGH_444 144 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA) #define FF_PROFILE_H264_CAVLC_444 44 #define FF_PROFILE_VC1_SIMPLE 0 #define FF_PROFILE_VC1_MAIN 1 #define FF_PROFILE_VC1_COMPLEX 2 #define FF_PROFILE_VC1_ADVANCED 3 #define FF_PROFILE_MPEG4_SIMPLE 0 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1 #define FF_PROFILE_MPEG4_CORE 2 #define FF_PROFILE_MPEG4_MAIN 3 #define FF_PROFILE_MPEG4_N_BIT 4 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7 #define FF_PROFILE_MPEG4_HYBRID 8 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15 /** * level * - encoding: Set by user. * - decoding: Set by libavcodec. */ int level; #define FF_LEVEL_UNKNOWN -99 /** * low resolution decoding, 1-> 1/2 size, 2->1/4 size * - encoding: unused * - decoding: Set by user. */ int lowres; /** * Bitstream width / height, may be different from width/height if lowres enabled. * - encoding: unused * - decoding: Set by user before init if known. Codec should override / dynamically change if needed. */ int coded_width, coded_height; /** * frame skip threshold * - encoding: Set by user. * - decoding: unused */ int frame_skip_threshold; /** * frame skip factor * - encoding: Set by user. * - decoding: unused */ int frame_skip_factor; /** * frame skip exponent * - encoding: Set by user. * - decoding: unused */ int frame_skip_exp; /** * frame skip comparison function * - encoding: Set by user. * - decoding: unused */ int frame_skip_cmp; /** * Border processing masking, raises the quantizer for mbs on the borders * of the picture. * - encoding: Set by user. * - decoding: unused */ float border_masking; /** * minimum MB lagrange multipler * - encoding: Set by user. * - decoding: unused */ int mb_lmin; /** * maximum MB lagrange multipler * - encoding: Set by user. * - decoding: unused */ int mb_lmax; /** * * - encoding: Set by user. * - decoding: unused */ int me_penalty_compensation; /** * * - encoding: unused * - decoding: Set by user. */ enum AVDiscard skip_loop_filter; /** * * - encoding: unused * - decoding: Set by user. */ enum AVDiscard skip_idct; /** * * - encoding: unused * - decoding: Set by user. */ enum AVDiscard skip_frame; /** * * - encoding: Set by user. * - decoding: unused */ int bidir_refine; /** * * - encoding: Set by user. * - decoding: unused */ int brd_scale; #if FF_API_X264_GLOBAL_OPTS /** * constant rate factor - quality-based VBR - values ~correspond to qps * - encoding: Set by user. * - decoding: unused * @deprecated use 'crf' libx264 private option */ attribute_deprecated float crf; /** * constant quantization parameter rate control method * - encoding: Set by user. * - decoding: unused * @deprecated use 'cqp' libx264 private option */ attribute_deprecated int cqp; #endif /** * minimum GOP size * - encoding: Set by user. * - decoding: unused */ int keyint_min; /** * number of reference frames * - encoding: Set by user. * - decoding: Set by lavc. */ int refs; /** * chroma qp offset from luma * - encoding: Set by user. * - decoding: unused */ int chromaoffset; #if FF_API_X264_GLOBAL_OPTS /** * Influences how often B-frames are used. * - encoding: Set by user. * - decoding: unused */ attribute_deprecated int bframebias; #endif /** * trellis RD quantization * - encoding: Set by user. * - decoding: unused */ int trellis; #if FF_API_X264_GLOBAL_OPTS /** * Reduce fluctuations in qp (before curve compression). * - encoding: Set by user. * - decoding: unused */ attribute_deprecated float complexityblur; /** * in-loop deblocking filter alphac0 parameter * alpha is in the range -6...6 * - encoding: Set by user. * - decoding: unused */ attribute_deprecated int deblockalpha; /** * in-loop deblocking filter beta parameter * beta is in the range -6...6 * - encoding: Set by user. * - decoding: unused */ attribute_deprecated int deblockbeta; /** * macroblock subpartition sizes to consider - p8x8, p4x4, b8x8, i8x8, i4x4 * - encoding: Set by user. * - decoding: unused */ attribute_deprecated int partitions; #define X264_PART_I4X4 0x001 /* Analyze i4x4 */ #define X264_PART_I8X8 0x002 /* Analyze i8x8 (requires 8x8 transform) */ #define X264_PART_P8X8 0x010 /* Analyze p16x8, p8x16 and p8x8 */ #define X264_PART_P4X4 0x020 /* Analyze p8x4, p4x8, p4x4 */ #define X264_PART_B8X8 0x100 /* Analyze b16x8, b8x16 and b8x8 */ /** * direct MV prediction mode - 0 (none), 1 (spatial), 2 (temporal), 3 (auto) * - encoding: Set by user. * - decoding: unused */ attribute_deprecated int directpred; #endif /** * Audio cutoff bandwidth (0 means "automatic") * - encoding: Set by user. * - decoding: unused */ int cutoff; /** * Multiplied by qscale for each frame and added to scene_change_score. * - encoding: Set by user. * - decoding: unused */ int scenechange_factor; /** * * Note: Value depends upon the compare function used for fullpel ME. * - encoding: Set by user. * - decoding: unused */ int mv0_threshold; /** * Adjusts sensitivity of b_frame_strategy 1. * - encoding: Set by user. * - decoding: unused */ int b_sensitivity; /** * - encoding: Set by user. * - decoding: unused */ int compression_level; #define FF_COMPRESSION_DEFAULT -1 /** * - encoding: Set by user. * - decoding: unused */ int min_prediction_order; /** * - encoding: Set by user. * - decoding: unused */ int max_prediction_order; #if FF_API_FLAC_GLOBAL_OPTS /** * @name FLAC options * @deprecated Use FLAC encoder private options instead. * @{ */ /** * LPC coefficient precision - used by FLAC encoder * - encoding: Set by user. * - decoding: unused */ attribute_deprecated int lpc_coeff_precision; /** * search method for selecting prediction order * - encoding: Set by user. * - decoding: unused */ attribute_deprecated int prediction_order_method; /** * - encoding: Set by user. * - decoding: unused */ attribute_deprecated int min_partition_order; /** * - encoding: Set by user. * - decoding: unused */ attribute_deprecated int max_partition_order; /** * @} */ #endif /** * GOP timecode frame start number * - encoding: Set by user, in non drop frame format * - decoding: Set by libavcodec (timecode in the 25 bits format, -1 if unset) */ int64_t timecode_frame_start; #if FF_API_REQUEST_CHANNELS /** * Decoder should decode to this many channels if it can (0 for default) * - encoding: unused * - decoding: Set by user. * @deprecated Deprecated in favor of request_channel_layout. */ int request_channels; #endif #if FF_API_DRC_SCALE /** * Percentage of dynamic range compression to be applied by the decoder. * The default value is 1.0, corresponding to full compression. * - encoding: unused * - decoding: Set by user. * @deprecated use AC3 decoder private option instead. */ attribute_deprecated float drc_scale; #endif /** * opaque 64bit number (generally a PTS) that will be reordered and * output in AVFrame.reordered_opaque * @deprecated in favor of pkt_pts * - encoding: unused * - decoding: Set by user. */ int64_t reordered_opaque; /** * Bits per sample/pixel of internal libavcodec pixel/sample format. * - encoding: set by user. * - decoding: set by libavcodec. */ int bits_per_raw_sample; /** * Audio channel layout. * - encoding: set by user. * - decoding: set by user, may be overwritten by libavcodec. */ uint64_t channel_layout; /** * Request decoder to use this channel layout if it can (0 for default) * - encoding: unused * - decoding: Set by user. */ uint64_t request_channel_layout; /** * Ratecontrol attempt to use, at maximum, of what can be used without an underflow. * - encoding: Set by user. * - decoding: unused. */ float rc_max_available_vbv_use; /** * Ratecontrol attempt to use, at least, times the amount needed to prevent a vbv overflow. * - encoding: Set by user. * - decoding: unused. */ float rc_min_vbv_overflow_use; /** * Hardware accelerator in use * - encoding: unused. * - decoding: Set by libavcodec */ struct AVHWAccel *hwaccel; /** * For some codecs, the time base is closer to the field rate than the frame rate. * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration * if no telecine is used ... * * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2. */ int ticks_per_frame; /** * Hardware accelerator context. * For some hardware accelerators, a global context needs to be * provided by the user. In that case, this holds display-dependent * data FFmpeg cannot instantiate itself. Please refer to the * FFmpeg HW accelerator documentation to know how to fill this * is. e.g. for VA API, this is a struct vaapi_context. * - encoding: unused * - decoding: Set by user */ void *hwaccel_context; /** * Chromaticity coordinates of the source primaries. * - encoding: Set by user * - decoding: Set by libavcodec */ enum AVColorPrimaries color_primaries; /** * Color Transfer Characteristic. * - encoding: Set by user * - decoding: Set by libavcodec */ enum AVColorTransferCharacteristic color_trc; /** * YUV colorspace type. * - encoding: Set by user * - decoding: Set by libavcodec */ enum AVColorSpace colorspace; /** * MPEG vs JPEG YUV range. * - encoding: Set by user * - decoding: Set by libavcodec */ enum AVColorRange color_range; /** * This defines the location of chroma samples. * - encoding: Set by user * - decoding: Set by libavcodec */ enum AVChromaLocation chroma_sample_location; /** * The codec may call this to execute several independent things. * It will return only after finishing all tasks. * The user may replace this with some multithreaded implementation, * the default implementation will execute the parts serially. * Also see avcodec_thread_init and e.g. the --enable-pthread configure option. * @param c context passed also to func * @param count the number of things to execute * @param arg2 argument passed unchanged to func * @param ret return values of executed functions, must have space for "count" values. May be NULL. * @param func function that will be called count times, with jobnr from 0 to count-1. * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no * two instances of func executing at the same time will have the same threadnr. * @return always 0 currently, but code should handle a future improvement where when any call to func * returns < 0 no further calls to func may be done and < 0 is returned. * - encoding: Set by libavcodec, user can override. * - decoding: Set by libavcodec, user can override. */ int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count); #if FF_API_X264_GLOBAL_OPTS /** * explicit P-frame weighted prediction analysis method * 0: off * 1: fast blind weighting (one reference duplicate with -1 offset) * 2: smart weighting (full fade detection analysis) * - encoding: Set by user. * - decoding: unused */ attribute_deprecated int weighted_p_pred; /** * AQ mode * 0: Disabled * 1: Variance AQ (complexity mask) * 2: Auto-variance AQ (experimental) * - encoding: Set by user * - decoding: unused */ attribute_deprecated int aq_mode; /** * AQ strength * Reduces blocking and blurring in flat and textured areas. * - encoding: Set by user * - decoding: unused */ attribute_deprecated float aq_strength; /** * PSY RD * Strength of psychovisual optimization * - encoding: Set by user * - decoding: unused */ attribute_deprecated float psy_rd; /** * PSY trellis * Strength of psychovisual optimization * - encoding: Set by user * - decoding: unused */ attribute_deprecated float psy_trellis; /** * RC lookahead * Number of frames for frametype and ratecontrol lookahead * - encoding: Set by user * - decoding: unused */ attribute_deprecated int rc_lookahead; /** * Constant rate factor maximum * With CRF encoding mode and VBV restrictions enabled, prevents quality from being worse * than crf_max, even if doing so would violate VBV restrictions. * - encoding: Set by user. * - decoding: unused */ attribute_deprecated float crf_max; #endif int log_level_offset; #if FF_API_FLAC_GLOBAL_OPTS /** * Determines which LPC analysis algorithm to use. * - encoding: Set by user * - decoding: unused */ attribute_deprecated enum AVLPCType lpc_type; /** * Number of passes to use for Cholesky factorization during LPC analysis * - encoding: Set by user * - decoding: unused */ attribute_deprecated int lpc_passes; #endif /** * Number of slices. * Indicates number of picture subdivisions. Used for parallelized * decoding. * - encoding: Set by user * - decoding: unused */ int slices; /** * Header containing style information for text subtitles. * For SUBTITLE_ASS subtitle type, it should contain the whole ASS * [Script Info] and [V4+ Styles] section, plus the [Events] line and * the Format line following. It shouldn't include any Dialogue line. * - encoding: Set/allocated/freed by user (before avcodec_open2()) * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2()) */ uint8_t *subtitle_header; int subtitle_header_size; /** * Current packet as passed into the decoder, to avoid having * to pass the packet into every function. Currently only valid * inside lavc and get/release_buffer callbacks. * - decoding: set by avcodec_decode_*, read by get_buffer() for setting pkt_pts * - encoding: unused */ AVPacket *pkt; #if FF_API_INTERNAL_CONTEXT /** * Whether this is a copy of the context which had init() called on it. * This is used by multithreading - shared tables and picture pointers * should be freed from the original context only. * - encoding: Set by libavcodec. * - decoding: Set by libavcodec. * * @deprecated this field has been moved to an internal context */ attribute_deprecated int is_copy; #endif /** * Which multithreading methods to use. * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread, * so clients which cannot provide future frames should not use it. * * - encoding: Set by user, otherwise the default is used. * - decoding: Set by user, otherwise the default is used. */ int thread_type; #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once /** * Which multithreading methods are in use by the codec. * - encoding: Set by libavcodec. * - decoding: Set by libavcodec. */ int active_thread_type; /** * Set by the client if its custom get_buffer() callback can be called * from another thread, which allows faster multithreaded decoding. * draw_horiz_band() will be called from other threads regardless of this setting. * Ignored if the default get_buffer() is used. * - encoding: Set by user. * - decoding: Set by user. */ int thread_safe_callbacks; /** * VBV delay coded in the last frame (in periods of a 27 MHz clock). * Used for compliant TS muxing. * - encoding: Set by libavcodec. * - decoding: unused. */ uint64_t vbv_delay; /** * Type of service that the audio stream conveys. * - encoding: Set by user. * - decoding: Set by libavcodec. */ enum AVAudioServiceType audio_service_type; /** * desired sample format * - encoding: Not used. * - decoding: Set by user. * Decoder will decode to this format if it can. */ enum AVSampleFormat request_sample_fmt; /** * Error recognition; may misdetect some more or less valid parts as errors. * - encoding: unused * - decoding: Set by user. */ int err_recognition; #define AV_EF_CRCCHECK (1<<0) #define AV_EF_BITSTREAM (1<<1) #define AV_EF_BUFFER (1<<2) #define AV_EF_EXPLODE (1<<3) #define AV_EF_CAREFUL (1<<16) #define AV_EF_COMPLIANT (1<<17) #define AV_EF_AGGRESSIVE (1<<18) /** * Private context used for internal data. * * Unlike priv_data, this is not codec-specific. It is used in general * libavcodec functions. */ struct AVCodecInternal *internal; /** * Current statistics for PTS correction. * - decoding: maintained and used by libavcodec, not intended to be used by user apps * - encoding: unused */ int64_t pts_correction_num_faulty_pts; /// Number of incorrect PTS values so far int64_t pts_correction_num_faulty_dts; /// Number of incorrect DTS values so far int64_t pts_correction_last_pts; /// PTS of the last frame int64_t pts_correction_last_dts; /// DTS of the last frame } AVCodecContext; /** * AVProfile. */ typedef struct AVProfile { int profile; const char *name; ///< short name for the profile } AVProfile; typedef struct AVCodecDefault AVCodecDefault; /** * AVCodec. */ typedef struct AVCodec { /** * Name of the codec implementation. * The name is globally unique among encoders and among decoders (but an * encoder and a decoder can share the same name). * This is the primary way to find a codec from the user perspective. */ const char *name; enum AVMediaType type; enum CodecID id; int priv_data_size; int (*init)(AVCodecContext *); int (*encode)(AVCodecContext *, uint8_t *buf, int buf_size, void *data); int (*close)(AVCodecContext *); int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt); /** * Codec capabilities. * see CODEC_CAP_* */ int capabilities; struct AVCodec *next; /** * Flush buffers. * Will be called when seeking */ void (*flush)(AVCodecContext *); const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0} const enum PixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1 /** * Descriptive name for the codec, meant to be more human readable than name. * You should use the NULL_IF_CONFIG_SMALL() macro to define it. */ const char *long_name; const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0 uint8_t max_lowres; ///< maximum value for lowres supported by the decoder const AVClass *priv_class; ///< AVClass for the private context const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN} /** * @name Frame-level threading support functions * @{ */ /** * If defined, called on thread contexts when they are created. * If the codec allocates writable tables in init(), re-allocate them here. * priv_data will be set to a copy of the original. */ int (*init_thread_copy)(AVCodecContext *); /** * Copy necessary context variables from a previous thread context to the current one. * If not defined, the next thread will start automatically; otherwise, the codec * must call ff_thread_finish_setup(). * * dst and src will (rarely) point to the same context, in which case memcpy should be skipped. */ int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src); /** @} */ /** * Private codec-specific defaults. */ const AVCodecDefault *defaults; /** * Initialize codec static data, called from avcodec_register(). */ void (*init_static_data)(struct AVCodec *codec); } AVCodec; /** * AVHWAccel. */ typedef struct AVHWAccel { /** * Name of the hardware accelerated codec. * The name is globally unique among encoders and among decoders (but an * encoder and a decoder can share the same name). */ const char *name; /** * Type of codec implemented by the hardware accelerator. * * See AVMEDIA_TYPE_xxx */ enum AVMediaType type; /** * Codec implemented by the hardware accelerator. * * See CODEC_ID_xxx */ enum CodecID id; /** * Supported pixel format. * * Only hardware accelerated formats are supported here. */ enum PixelFormat pix_fmt; /** * Hardware accelerated codec capabilities. * see FF_HWACCEL_CODEC_CAP_* */ int capabilities; struct AVHWAccel *next; /** * Called at the beginning of each frame or field picture. * * Meaningful frame information (codec specific) is guaranteed to * be parsed at this point. This function is mandatory. * * Note that buf can be NULL along with buf_size set to 0. * Otherwise, this means the whole frame is available at this point. * * @param avctx the codec context * @param buf the frame data buffer base * @param buf_size the size of the frame in bytes * @return zero if successful, a negative value otherwise */ int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size); /** * Callback for each slice. * * Meaningful slice information (codec specific) is guaranteed to * be parsed at this point. This function is mandatory. * * @param avctx the codec context * @param buf the slice data buffer base * @param buf_size the size of the slice in bytes * @return zero if successful, a negative value otherwise */ int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size); /** * Called at the end of each frame or field picture. * * The whole picture is parsed at this point and can now be sent * to the hardware accelerator. This function is mandatory. * * @param avctx the codec context * @return zero if successful, a negative value otherwise */ int (*end_frame)(AVCodecContext *avctx); /** * Size of HW accelerator private data. * * Private data is allocated with av_mallocz() before * AVCodecContext.get_buffer() and deallocated after * AVCodecContext.release_buffer(). */ int priv_data_size; } AVHWAccel; /** * four components are given, that's all. * the last component is alpha */ typedef struct AVPicture { uint8_t *data[AV_NUM_DATA_POINTERS]; int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line } AVPicture; #define AVPALETTE_SIZE 1024 #define AVPALETTE_COUNT 256 #if FF_API_PALETTE_CONTROL /** * AVPaletteControl * This structure defines a method for communicating palette changes * between and demuxer and a decoder. * * @deprecated Use AVPacket to send palette changes instead. * This is totally broken. */ typedef struct AVPaletteControl { /* Demuxer sets this to 1 to indicate the palette has changed; * decoder resets to 0. */ int palette_changed; /* 4-byte ARGB palette entries, stored in native byte order; note that * the individual palette components should be on a 8-bit scale; if * the palette data comes from an IBM VGA native format, the component * data is probably 6 bits in size and needs to be scaled. */ unsigned int palette[AVPALETTE_COUNT]; } AVPaletteControl attribute_deprecated; #endif enum AVSubtitleType { SUBTITLE_NONE, SUBTITLE_BITMAP, ///< A bitmap, pict will be set /** * Plain text, the text field must be set by the decoder and is * authoritative. ass and pict fields may contain approximations. */ SUBTITLE_TEXT, /** * Formatted text, the ass field must be set by the decoder and is * authoritative. pict and text fields may contain approximations. */ SUBTITLE_ASS, }; typedef struct AVSubtitleRect { int x; ///< top left corner of pict, undefined when pict is not set int y; ///< top left corner of pict, undefined when pict is not set int w; ///< width of pict, undefined when pict is not set int h; ///< height of pict, undefined when pict is not set int nb_colors; ///< number of colors in pict, undefined when pict is not set /** * data+linesize for the bitmap of this subtitle. * can be set for text/ass as well once they where rendered */ AVPicture pict; enum AVSubtitleType type; char *text; ///< 0 terminated plain UTF-8 text /** * 0 terminated ASS/SSA compatible event line. * The pressentation of this is unaffected by the other values in this * struct. */ char *ass; } AVSubtitleRect; typedef struct AVSubtitle { uint16_t format; /* 0 = graphics */ uint32_t start_display_time; /* relative to packet pts, in ms */ uint32_t end_display_time; /* relative to packet pts, in ms */ unsigned num_rects; AVSubtitleRect **rects; int64_t pts; ///< Same as packet pts, in AV_TIME_BASE } AVSubtitle; /* packet functions */ /** * @deprecated use NULL instead */ attribute_deprecated void av_destruct_packet_nofree(AVPacket *pkt); /** * Default packet destructor. */ void av_destruct_packet(AVPacket *pkt); /** * Initialize optional fields of a packet with default values. * * @param pkt packet */ void av_init_packet(AVPacket *pkt); /** * Allocate the payload of a packet and initialize its fields with * default values. * * @param pkt packet * @param size wanted payload size * @return 0 if OK, AVERROR_xxx otherwise */ int av_new_packet(AVPacket *pkt, int size); /** * Reduce packet size, correctly zeroing padding * * @param pkt packet * @param size new size */ void av_shrink_packet(AVPacket *pkt, int size); /** * Increase packet size, correctly zeroing padding * * @param pkt packet * @param grow_by number of bytes by which to increase the size of the packet */ int av_grow_packet(AVPacket *pkt, int grow_by); /** * @warning This is a hack - the packet memory allocation stuff is broken. The * packet is allocated if it was not really allocated. */ int av_dup_packet(AVPacket *pkt); /** * Free a packet. * * @param pkt packet to free */ void av_free_packet(AVPacket *pkt); /** * Allocate new information of a packet. * * @param pkt packet * @param type side information type * @param size side information size * @return pointer to fresh allocated data or NULL otherwise */ uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type, int size); /** * Get side information from packet. * * @param pkt packet * @param type desired side information type * @param size pointer for side information size to store (optional) * @return pointer to data if present or NULL otherwise */ uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type, int *size); int av_packet_merge_side_data(AVPacket *pkt); int av_packet_split_side_data(AVPacket *pkt); /* resample.c */ struct ReSampleContext; struct AVResampleContext; typedef struct ReSampleContext ReSampleContext; /** * Initialize audio resampling context. * * @param output_channels number of output channels * @param input_channels number of input channels * @param output_rate output sample rate * @param input_rate input sample rate * @param sample_fmt_out requested output sample format * @param sample_fmt_in input sample format * @param filter_length length of each FIR filter in the filterbank relative to the cutoff frequency * @param log2_phase_count log2 of the number of entries in the polyphase filterbank * @param linear if 1 then the used FIR filter will be linearly interpolated between the 2 closest, if 0 the closest will be used * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate * @return allocated ReSampleContext, NULL if error occurred */ ReSampleContext *av_audio_resample_init(int output_channels, int input_channels, int output_rate, int input_rate, enum AVSampleFormat sample_fmt_out, enum AVSampleFormat sample_fmt_in, int filter_length, int log2_phase_count, int linear, double cutoff); int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples); /** * Free resample context. * * @param s a non-NULL pointer to a resample context previously * created with av_audio_resample_init() */ void audio_resample_close(ReSampleContext *s); /** * Initialize an audio resampler. * Note, if either rate is not an integer then simply scale both rates up so they are. * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq * @param log2_phase_count log2 of the number of entries in the polyphase filterbank * @param linear If 1 then the used FIR filter will be linearly interpolated between the 2 closest, if 0 the closest will be used * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate */ struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff); /** * Resample an array of samples using a previously configured context. * @param src an array of unconsumed samples * @param consumed the number of samples of src which have been consumed are returned here * @param src_size the number of unconsumed samples available * @param dst_size the amount of space in samples available in dst * @param update_ctx If this is 0 then the context will not be modified, that way several channels can be resampled with the same context. * @return the number of samples written in dst or -1 if an error occurred */ int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx); /** * Compensate samplerate/timestamp drift. The compensation is done by changing * the resampler parameters, so no audible clicks or similar distortions occur * @param compensation_distance distance in output samples over which the compensation should be performed * @param sample_delta number of output samples which should be output less * * example: av_resample_compensate(c, 10, 500) * here instead of 510 samples only 500 samples would be output * * note, due to rounding the actual compensation might be slightly different, * especially if the compensation_distance is large and the in_rate used during init is small */ void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance); void av_resample_close(struct AVResampleContext *c); /** * Allocate memory for a picture. Call avpicture_free() to free it. * * @see avpicture_fill() * * @param picture the picture to be filled in * @param pix_fmt the format of the picture * @param width the width of the picture * @param height the height of the picture * @return zero if successful, a negative value if not */ int avpicture_alloc(AVPicture *picture, enum PixelFormat pix_fmt, int width, int height); /** * Free a picture previously allocated by avpicture_alloc(). * The data buffer used by the AVPicture is freed, but the AVPicture structure * itself is not. * * @param picture the AVPicture to be freed */ void avpicture_free(AVPicture *picture); /** * Fill in the AVPicture fields. * The fields of the given AVPicture are filled in by using the 'ptr' address * which points to the image data buffer. Depending on the specified picture * format, one or multiple image data pointers and line sizes will be set. * If a planar format is specified, several pointers will be set pointing to * the different picture planes and the line sizes of the different planes * will be stored in the lines_sizes array. * Call with ptr == NULL to get the required size for the ptr buffer. * * To allocate the buffer and fill in the AVPicture fields in one call, * use avpicture_alloc(). * * @param picture AVPicture whose fields are to be filled in * @param ptr Buffer which will contain or contains the actual image data * @param pix_fmt The format in which the picture data is stored. * @param width the width of the image in pixels * @param height the height of the image in pixels * @return size of the image data in bytes */ int avpicture_fill(AVPicture *picture, uint8_t *ptr, enum PixelFormat pix_fmt, int width, int height); /** * Copy pixel data from an AVPicture into a buffer. * The data is stored compactly, without any gaps for alignment or padding * which may be applied by avpicture_fill(). * * @see avpicture_get_size() * * @param[in] src AVPicture containing image data * @param[in] pix_fmt The format in which the picture data is stored. * @param[in] width the width of the image in pixels. * @param[in] height the height of the image in pixels. * @param[out] dest A buffer into which picture data will be copied. * @param[in] dest_size The size of 'dest'. * @return The number of bytes written to dest, or a negative value (error code) on error. */ int avpicture_layout(const AVPicture* src, enum PixelFormat pix_fmt, int width, int height, unsigned char *dest, int dest_size); /** * Calculate the size in bytes that a picture of the given width and height * would occupy if stored in the given picture format. * Note that this returns the size of a compact representation as generated * by avpicture_layout(), which can be smaller than the size required for e.g. * avpicture_fill(). * * @param pix_fmt the given picture format * @param width the width of the image * @param height the height of the image * @return Image data size in bytes or -1 on error (e.g. too large dimensions). */ int avpicture_get_size(enum PixelFormat pix_fmt, int width, int height); void avcodec_get_chroma_sub_sample(enum PixelFormat pix_fmt, int *h_shift, int *v_shift); /** * Get the name of a codec. * @return a static string identifying the codec; never NULL */ const char *avcodec_get_name(enum CodecID id); #if FF_API_GET_PIX_FMT_NAME /** * Return the short name for a pixel format. * * \see av_get_pix_fmt(), av_get_pix_fmt_string(). * @deprecated Deprecated in favor of av_get_pix_fmt_name(). */ attribute_deprecated const char *avcodec_get_pix_fmt_name(enum PixelFormat pix_fmt); #endif void avcodec_set_dimensions(AVCodecContext *s, int width, int height); /** * Return a value representing the fourCC code associated to the * pixel format pix_fmt, or 0 if no associated fourCC code can be * found. */ unsigned int avcodec_pix_fmt_to_codec_tag(enum PixelFormat pix_fmt); /** * Put a string representing the codec tag codec_tag in buf. * * @param buf_size size in bytes of buf * @return the length of the string that would have been generated if * enough space had been available, excluding the trailing null */ size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag); #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */ #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */ #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */ #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */ #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */ #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */ /** * Compute what kind of losses will occur when converting from one specific * pixel format to another. * When converting from one pixel format to another, information loss may occur. * For example, when converting from RGB24 to GRAY, the color information will * be lost. Similarly, other losses occur when converting from some formats to * other formats. These losses can involve loss of chroma, but also loss of * resolution, loss of color depth, loss due to the color space conversion, loss * of the alpha bits or loss due to color quantization. * avcodec_get_fix_fmt_loss() informs you about the various types of losses * which will occur when converting from one pixel format to another. * * @param[in] dst_pix_fmt destination pixel format * @param[in] src_pix_fmt source pixel format * @param[in] has_alpha Whether the source pixel format alpha channel is used. * @return Combination of flags informing you what kind of losses will occur * (maximum loss for an invalid dst_pix_fmt). */ int avcodec_get_pix_fmt_loss(enum PixelFormat dst_pix_fmt, enum PixelFormat src_pix_fmt, int has_alpha); /** * Find the best pixel format to convert to given a certain source pixel * format. When converting from one pixel format to another, information loss * may occur. For example, when converting from RGB24 to GRAY, the color * information will be lost. Similarly, other losses occur when converting from * some formats to other formats. avcodec_find_best_pix_fmt() searches which of * the given pixel formats should be used to suffer the least amount of loss. * The pixel formats from which it chooses one, are determined by the * pix_fmt_mask parameter. * * Note, only the first 64 pixel formats will fit in pix_fmt_mask. * * @code * src_pix_fmt = PIX_FMT_YUV420P; * pix_fmt_mask = (1 << PIX_FMT_YUV422P) | (1 << PIX_FMT_RGB24); * dst_pix_fmt = avcodec_find_best_pix_fmt(pix_fmt_mask, src_pix_fmt, alpha, &loss); * @endcode * * @param[in] pix_fmt_mask bitmask determining which pixel format to choose from * @param[in] src_pix_fmt source pixel format * @param[in] has_alpha Whether the source pixel format alpha channel is used. * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur. * @return The best pixel format to convert to or -1 if none was found. */ enum PixelFormat avcodec_find_best_pix_fmt(int64_t pix_fmt_mask, enum PixelFormat src_pix_fmt, int has_alpha, int *loss_ptr); /** * Find the best pixel format to convert to given a certain source pixel * format and a selection of two destination pixel formats. When converting from * one pixel format to another, information loss may occur. For example, when converting * from RGB24 to GRAY, the color information will be lost. Similarly, other losses occur when * converting from some formats to other formats. avcodec_find_best_pix_fmt2() selects which of * the given pixel formats should be used to suffer the least amount of loss. * * If one of the destination formats is PIX_FMT_NONE the other pixel format (if valid) will be * returned. * * @code * src_pix_fmt = PIX_FMT_YUV420P; * dst_pix_fmt1= PIX_FMT_RGB24; * dst_pix_fmt2= PIX_FMT_GRAY8; * dst_pix_fmt3= PIX_FMT_RGB8; * loss= FF_LOSS_CHROMA; // don't care about chroma loss, so chroma loss will be ignored. * dst_pix_fmt = avcodec_find_best_pix_fmt2(dst_pix_fmt1, dst_pix_fmt2, src_pix_fmt, alpha, &loss); * dst_pix_fmt = avcodec_find_best_pix_fmt2(dst_pix_fmt, dst_pix_fmt3, src_pix_fmt, alpha, &loss); * @endcode * * @param[in] dst_pix_fmt1 One of the two destination pixel formats to choose from * @param[in] dst_pix_fmt2 The other of the two destination pixel formats to choose from * @param[in] src_pix_fmt Source pixel format * @param[in] has_alpha Whether the source pixel format alpha channel is used. * @param[in, out] loss_ptr Combination of loss flags. In: selects which of the losses to ignore, i.e. * NULL or value of zero means we care about all losses. Out: the loss * that occurs when converting from src to selected dst pixel format. * @return The best pixel format to convert to or -1 if none was found. */ enum PixelFormat avcodec_find_best_pix_fmt2(enum PixelFormat dst_pix_fmt1, enum PixelFormat dst_pix_fmt2, enum PixelFormat src_pix_fmt, int has_alpha, int *loss_ptr); #if FF_API_GET_ALPHA_INFO #define FF_ALPHA_TRANSP 0x0001 /* image has some totally transparent pixels */ #define FF_ALPHA_SEMI_TRANSP 0x0002 /* image has some transparent pixels */ /** * Tell if an image really has transparent alpha values. * @return ored mask of FF_ALPHA_xxx constants */ attribute_deprecated int img_get_alpha_info(const AVPicture *src, enum PixelFormat pix_fmt, int width, int height); #endif /* deinterlace a picture */ /* deinterlace - if not supported return -1 */ int avpicture_deinterlace(AVPicture *dst, const AVPicture *src, enum PixelFormat pix_fmt, int width, int height); /* external high level API */ /** * If c is NULL, returns the first registered codec, * if c is non-NULL, returns the next registered codec after c, * or NULL if c is the last one. */ AVCodec *av_codec_next(AVCodec *c); /** * Return the LIBAVCODEC_VERSION_INT constant. */ unsigned avcodec_version(void); /** * Return the libavcodec build-time configuration. */ const char *avcodec_configuration(void); /** * Return the libavcodec license. */ const char *avcodec_license(void); #if FF_API_AVCODEC_INIT /** * @deprecated this function is called automatically from avcodec_register() * and avcodec_register_all(), there is no need to call it manually */ attribute_deprecated void avcodec_init(void); #endif /** * Register the codec codec and initialize libavcodec. * * @warning either this function or avcodec_register_all() must be called * before any other libavcodec functions. * * @see avcodec_register_all() */ void avcodec_register(AVCodec *codec); /** * Find a registered encoder with a matching codec ID. * * @param id CodecID of the requested encoder * @return An encoder if one was found, NULL otherwise. */ AVCodec *avcodec_find_encoder(enum CodecID id); /** * Find a registered encoder with the specified name. * * @param name name of the requested encoder * @return An encoder if one was found, NULL otherwise. */ AVCodec *avcodec_find_encoder_by_name(const char *name); /** * Find a registered decoder with a matching codec ID. * * @param id CodecID of the requested decoder * @return A decoder if one was found, NULL otherwise. */ AVCodec *avcodec_find_decoder(enum CodecID id); /** * Find a registered decoder with the specified name. * * @param name name of the requested decoder * @return A decoder if one was found, NULL otherwise. */ AVCodec *avcodec_find_decoder_by_name(const char *name); void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode); /** * Return a name for the specified profile, if available. * * @param codec the codec that is searched for the given profile * @param profile the profile value for which a name is requested * @return A name for the profile if found, NULL otherwise. */ const char *av_get_profile_name(const AVCodec *codec, int profile); #if FF_API_ALLOC_CONTEXT /** * Set the fields of the given AVCodecContext to default values. * * @param s The AVCodecContext of which the fields should be set to default values. * @deprecated use avcodec_get_context_defaults3 */ attribute_deprecated void avcodec_get_context_defaults(AVCodecContext *s); /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API! * we WILL change its arguments and name a few times! */ attribute_deprecated void avcodec_get_context_defaults2(AVCodecContext *s, enum AVMediaType); #endif /** * Set the fields of the given AVCodecContext to default values corresponding * to the given codec (defaults may be codec-dependent). * * Do not call this function if a non-NULL codec has been passed * to avcodec_alloc_context3() that allocated this AVCodecContext. * If codec is non-NULL, it is illegal to call avcodec_open2() with a * different codec on this AVCodecContext. */ int avcodec_get_context_defaults3(AVCodecContext *s, AVCodec *codec); #if FF_API_ALLOC_CONTEXT /** * Allocate an AVCodecContext and set its fields to default values. The * resulting struct can be deallocated by simply calling av_free(). * * @return An AVCodecContext filled with default values or NULL on failure. * @see avcodec_get_context_defaults * * @deprecated use avcodec_alloc_context3() */ attribute_deprecated AVCodecContext *avcodec_alloc_context(void); /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API! * we WILL change its arguments and name a few times! */ attribute_deprecated AVCodecContext *avcodec_alloc_context2(enum AVMediaType); #endif /** * Allocate an AVCodecContext and set its fields to default values. The * resulting struct can be deallocated by simply calling av_free(). * * @param codec if non-NULL, allocate private data and initialize defaults * for the given codec. It is illegal to then call avcodec_open2() * with a different codec. * * @return An AVCodecContext filled with default values or NULL on failure. * @see avcodec_get_context_defaults */ AVCodecContext *avcodec_alloc_context3(AVCodec *codec); /** * Copy the settings of the source AVCodecContext into the destination * AVCodecContext. The resulting destination codec context will be * unopened, i.e. you are required to call avcodec_open2() before you * can use this AVCodecContext to decode/encode video/audio data. * * @param dest target codec context, should be initialized with * avcodec_alloc_context3(), but otherwise uninitialized * @param src source codec context * @return AVERROR() on error (e.g. memory allocation error), 0 on success */ int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src); /** * Set the fields of the given AVFrame to default values. * * @param pic The AVFrame of which the fields should be set to default values. */ void avcodec_get_frame_defaults(AVFrame *pic); /** * Allocate an AVFrame and set its fields to default values. The resulting * struct can be deallocated by simply calling av_free(). * * @return An AVFrame filled with default values or NULL on failure. * @see avcodec_get_frame_defaults */ AVFrame *avcodec_alloc_frame(void); int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic); void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic); int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic); /** * Return the amount of padding in pixels which the get_buffer callback must * provide around the edge of the image for codecs which do not have the * CODEC_FLAG_EMU_EDGE flag. * * @return Required padding in pixels. */ unsigned avcodec_get_edge_width(void); /** * Modify width and height values so that they will result in a memory * buffer that is acceptable for the codec if you do not use any horizontal * padding. * * May only be used if a codec with CODEC_CAP_DR1 has been opened. * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased * according to avcodec_get_edge_width() before. */ void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height); /** * Modify width and height values so that they will result in a memory * buffer that is acceptable for the codec if you also ensure that all * line sizes are a multiple of the respective linesize_align[i]. * * May only be used if a codec with CODEC_CAP_DR1 has been opened. * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased * according to avcodec_get_edge_width() before. */ void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height, int linesize_align[AV_NUM_DATA_POINTERS]); enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt); #if FF_API_THREAD_INIT /** * @deprecated Set s->thread_count before calling avcodec_open2() instead of calling this. */ attribute_deprecated int avcodec_thread_init(AVCodecContext *s, int thread_count); #endif int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size); int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count); //FIXME func typedef #if FF_API_AVCODEC_OPEN /** * Initialize the AVCodecContext to use the given AVCodec. Prior to using this * function the context has to be allocated. * * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(), * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for * retrieving a codec. * * @warning This function is not thread safe! * * @code * avcodec_register_all(); * codec = avcodec_find_decoder(CODEC_ID_H264); * if (!codec) * exit(1); * * context = avcodec_alloc_context3(codec); * * if (avcodec_open(context, codec) < 0) * exit(1); * @endcode * * @param avctx The context which will be set up to use the given codec. * @param codec The codec to use within the context. * @return zero on success, a negative value on error * @see avcodec_alloc_context3, avcodec_find_decoder, avcodec_find_encoder, avcodec_close * * @deprecated use avcodec_open2 */ attribute_deprecated int avcodec_open(AVCodecContext *avctx, AVCodec *codec); #endif /** * Initialize the AVCodecContext to use the given AVCodec. Prior to using this * function the context has to be allocated with avcodec_alloc_context3(). * * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(), * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for * retrieving a codec. * * @warning This function is not thread safe! * * @code * avcodec_register_all(); * av_dict_set(&opts, "b", "2.5M", 0); * codec = avcodec_find_decoder(CODEC_ID_H264); * if (!codec) * exit(1); * * context = avcodec_alloc_context3(codec); * * if (avcodec_open2(context, codec, opts) < 0) * exit(1); * @endcode * * @param avctx The context to initialize. * @param options A dictionary filled with AVCodecContext and codec-private options. * On return this object will be filled with options that were not found. * * @return zero on success, a negative value on error * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(), * av_dict_set(), av_opt_find(). */ int avcodec_open2(AVCodecContext *avctx, AVCodec *codec, AVDictionary **options); #if FF_API_OLD_DECODE_AUDIO /** * Wrapper function which calls avcodec_decode_audio4. * * @deprecated Use avcodec_decode_audio4 instead. * * Decode the audio frame of size avpkt->size from avpkt->data into samples. * Some decoders may support multiple frames in a single AVPacket, such * decoders would then just decode the first frame. In this case, * avcodec_decode_audio3 has to be called again with an AVPacket that contains * the remaining data in order to decode the second frame etc. * If no frame * could be outputted, frame_size_ptr is zero. Otherwise, it is the * decompressed frame size in bytes. * * @warning You must set frame_size_ptr to the allocated size of the * output buffer before calling avcodec_decode_audio3(). * * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than * the actual read bytes because some optimized bitstream readers read 32 or 64 * bits at once and could read over the end. * * @warning The end of the input buffer avpkt->data should be set to 0 to ensure that * no overreading happens for damaged MPEG streams. * * @note You might have to align the input buffer avpkt->data and output buffer * samples. The alignment requirements depend on the CPU: On some CPUs it isn't * necessary at all, on others it won't work at all if not aligned and on others * it will work but it will have an impact on performance. * * In practice, avpkt->data should have 4 byte alignment at minimum and * samples should be 16 byte aligned unless the CPU doesn't need it * (AltiVec and SSE do). * * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay * between input and output, these need to be fed with avpkt->data=NULL, * avpkt->size=0 at the end to return the remaining frames. * * @param avctx the codec context * @param[out] samples the output buffer, sample type in avctx->sample_fmt * If the sample format is planar, each channel plane will * be the same size, with no padding between channels. * @param[in,out] frame_size_ptr the output buffer size in bytes * @param[in] avpkt The input AVPacket containing the input buffer. * You can create such packet with av_init_packet() and by then setting * data and size, some decoders might in addition need other fields. * All decoders are designed to use the least fields possible though. * @return On error a negative value is returned, otherwise the number of bytes * used or zero if no frame data was decompressed (used) from the input AVPacket. */ attribute_deprecated int avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples, int *frame_size_ptr, AVPacket *avpkt); #endif /** * Decode the audio frame of size avpkt->size from avpkt->data into frame. * * Some decoders may support multiple frames in a single AVPacket. Such * decoders would then just decode the first frame. In this case, * avcodec_decode_audio4 has to be called again with an AVPacket containing * the remaining data in order to decode the second frame, etc... * Even if no frames are returned, the packet needs to be fed to the decoder * with remaining data until it is completely consumed or an error occurs. * * @warning The input buffer, avpkt->data must be FF_INPUT_BUFFER_PADDING_SIZE * larger than the actual read bytes because some optimized bitstream * readers read 32 or 64 bits at once and could read over the end. * * @note You might have to align the input buffer. The alignment requirements * depend on the CPU and the decoder. * * @param avctx the codec context * @param[out] frame The AVFrame in which to store decoded audio samples. * Decoders request a buffer of a particular size by setting * AVFrame.nb_samples prior to calling get_buffer(). The * decoder may, however, only utilize part of the buffer by * setting AVFrame.nb_samples to a smaller value in the * output frame. * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is * non-zero. * @param[in] avpkt The input AVPacket containing the input buffer. * At least avpkt->data and avpkt->size should be set. Some * decoders might also require additional fields to be set. * @return A negative error code is returned if an error occurred during * decoding, otherwise the number of bytes consumed from the input * AVPacket is returned. */ int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame, int *got_frame_ptr, AVPacket *avpkt); /** * Decode the video frame of size avpkt->size from avpkt->data into picture. * Some decoders may support multiple frames in a single AVPacket, such * decoders would then just decode the first frame. * * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than * the actual read bytes because some optimized bitstream readers read 32 or 64 * bits at once and could read over the end. * * @warning The end of the input buffer buf should be set to 0 to ensure that * no overreading happens for damaged MPEG streams. * * @note You might have to align the input buffer avpkt->data. * The alignment requirements depend on the CPU: on some CPUs it isn't * necessary at all, on others it won't work at all if not aligned and on others * it will work but it will have an impact on performance. * * In practice, avpkt->data should have 4 byte alignment at minimum. * * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay * between input and output, these need to be fed with avpkt->data=NULL, * avpkt->size=0 at the end to return the remaining frames. * * @param avctx the codec context * @param[out] picture The AVFrame in which the decoded video frame will be stored. * Use avcodec_alloc_frame to get an AVFrame, the codec will * allocate memory for the actual bitmap. * with default get/release_buffer(), the decoder frees/reuses the bitmap as it sees fit. * with overridden get/release_buffer() (needs CODEC_CAP_DR1) the user decides into what buffer the decoder * decodes and the decoder tells the user once it does not need the data anymore, * the user app can at this point free/reuse/keep the memory as it sees fit. * * @param[in] avpkt The input AVpacket containing the input buffer. * You can create such packet with av_init_packet() and by then setting * data and size, some decoders might in addition need other fields like * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least * fields possible. * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero. * @return On error a negative value is returned, otherwise the number of bytes * used or zero if no frame could be decompressed. */ int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture, int *got_picture_ptr, AVPacket *avpkt); /** * Decode a subtitle message. * Return a negative value on error, otherwise return the number of bytes used. * If no subtitle could be decompressed, got_sub_ptr is zero. * Otherwise, the subtitle is stored in *sub. * Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for * simplicity, because the performance difference is expect to be negligible * and reusing a get_buffer written for video codecs would probably perform badly * due to a potentially very different allocation pattern. * * @param avctx the codec context * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be freed with avsubtitle_free if *got_sub_ptr is set. * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero. * @param[in] avpkt The input AVPacket containing the input buffer. */ int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub, int *got_sub_ptr, AVPacket *avpkt); /** * Frees all allocated data in the given subtitle struct. * * @param sub AVSubtitle to free. */ void avsubtitle_free(AVSubtitle *sub); /** * Encode an audio frame from samples into buf. * * @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large. * However, for PCM audio the user will know how much space is needed * because it depends on the value passed in buf_size as described * below. In that case a lower value can be used. * * @param avctx the codec context * @param[out] buf the output buffer * @param[in] buf_size the output buffer size * @param[in] samples the input buffer containing the samples * The number of samples read from this buffer is frame_size*channels, * both of which are defined in avctx. * For PCM audio the number of samples read from samples is equal to * buf_size * input_sample_size / output_sample_size. * @return On error a negative value is returned, on success zero or the number * of bytes used to encode the data read from the input buffer. */ int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size, const short *samples); /** * Encode a video frame from pict into buf. * The input picture should be * stored using a specific format, namely avctx.pix_fmt. * * @param avctx the codec context * @param[out] buf the output buffer for the bitstream of encoded frame * @param[in] buf_size the size of the output buffer in bytes * @param[in] pict the input picture to encode * @return On error a negative value is returned, on success zero or the number * of bytes used from the output buffer. */ int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size, const AVFrame *pict); int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size, const AVSubtitle *sub); int avcodec_close(AVCodecContext *avctx); /** * Register all the codecs, parsers and bitstream filters which were enabled at * configuration time. If you do not call this function you can select exactly * which formats you want to support, by using the individual registration * functions. * * @see avcodec_register * @see av_register_codec_parser * @see av_register_bitstream_filter */ void avcodec_register_all(void); /** * Flush buffers, should be called when seeking or when switching to a different stream. */ void avcodec_flush_buffers(AVCodecContext *avctx); void avcodec_default_free_buffers(AVCodecContext *s); /* misc useful functions */ #if FF_API_OLD_FF_PICT_TYPES /** * Return a single letter to describe the given picture type pict_type. * * @param[in] pict_type the picture type * @return A single character representing the picture type. * @deprecated Use av_get_picture_type_char() instead. */ attribute_deprecated char av_get_pict_type_char(int pict_type); #endif /** * Return codec bits per sample. * * @param[in] codec_id the codec * @return Number of bits per sample or zero if unknown for the given codec. */ int av_get_bits_per_sample(enum CodecID codec_id); #if FF_API_OLD_SAMPLE_FMT /** * @deprecated Use av_get_bytes_per_sample() instead. */ attribute_deprecated int av_get_bits_per_sample_format(enum AVSampleFormat sample_fmt); #endif /* frame parsing */ typedef struct AVCodecParserContext { void *priv_data; struct AVCodecParser *parser; int64_t frame_offset; /* offset of the current frame */ int64_t cur_offset; /* current offset (incremented by each av_parser_parse()) */ int64_t next_frame_offset; /* offset of the next frame */ /* video info */ int pict_type; /* XXX: Put it back in AVCodecContext. */ /** * This field is used for proper frame duration computation in lavf. * It signals, how much longer the frame duration of the current frame * is compared to normal frame duration. * * frame_duration = (1 + repeat_pict) * time_base * * It is used by codecs like H.264 to display telecined material. */ int repeat_pict; /* XXX: Put it back in AVCodecContext. */ int64_t pts; /* pts of the current frame */ int64_t dts; /* dts of the current frame */ /* private data */ int64_t last_pts; int64_t last_dts; int fetch_timestamp; #define AV_PARSER_PTS_NB 4 int cur_frame_start_index; int64_t cur_frame_offset[AV_PARSER_PTS_NB]; int64_t cur_frame_pts[AV_PARSER_PTS_NB]; int64_t cur_frame_dts[AV_PARSER_PTS_NB]; int flags; #define PARSER_FLAG_COMPLETE_FRAMES 0x0001 #define PARSER_FLAG_ONCE 0x0002 /// Set if the parser has a valid file offset #define PARSER_FLAG_FETCHED_OFFSET 0x0004 int64_t offset; ///< byte offset from starting packet start int64_t cur_frame_end[AV_PARSER_PTS_NB]; /** * Set by parser to 1 for key frames and 0 for non-key frames. * It is initialized to -1, so if the parser doesn't set this flag, * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames * will be used. */ int key_frame; /** * Time difference in stream time base units from the pts of this * packet to the point at which the output from the decoder has converged * independent from the availability of previous frames. That is, the * frames are virtually identical no matter if decoding started from * the very first frame or from this keyframe. * Is AV_NOPTS_VALUE if unknown. * This field is not the display duration of the current frame. * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY * set. * * The purpose of this field is to allow seeking in streams that have no * keyframes in the conventional sense. It corresponds to the * recovery point SEI in H.264 and match_time_delta in NUT. It is also * essential for some types of subtitle streams to ensure that all * subtitles are correctly displayed after seeking. */ int64_t convergence_duration; // Timestamp generation support: /** * Synchronization point for start of timestamp generation. * * Set to >0 for sync point, 0 for no sync point and <0 for undefined * (default). * * For example, this corresponds to presence of H.264 buffering period * SEI message. */ int dts_sync_point; /** * Offset of the current timestamp against last timestamp sync point in * units of AVCodecContext.time_base. * * Set to INT_MIN when dts_sync_point unused. Otherwise, it must * contain a valid timestamp offset. * * Note that the timestamp of sync point has usually a nonzero * dts_ref_dts_delta, which refers to the previous sync point. Offset of * the next frame after timestamp sync point will be usually 1. * * For example, this corresponds to H.264 cpb_removal_delay. */ int dts_ref_dts_delta; /** * Presentation delay of current frame in units of AVCodecContext.time_base. * * Set to INT_MIN when dts_sync_point unused. Otherwise, it must * contain valid non-negative timestamp delta (presentation time of a frame * must not lie in the past). * * This delay represents the difference between decoding and presentation * time of the frame. * * For example, this corresponds to H.264 dpb_output_delay. */ int pts_dts_delta; /** * Position of the packet in file. * * Analogous to cur_frame_pts/dts */ int64_t cur_frame_pos[AV_PARSER_PTS_NB]; /** * Byte position of currently parsed frame in stream. */ int64_t pos; /** * Previous frame byte position. */ int64_t last_pos; } AVCodecParserContext; typedef struct AVCodecParser { int codec_ids[5]; /* several codec IDs are permitted */ int priv_data_size; int (*parser_init)(AVCodecParserContext *s); int (*parser_parse)(AVCodecParserContext *s, AVCodecContext *avctx, const uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size); void (*parser_close)(AVCodecParserContext *s); int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size); struct AVCodecParser *next; } AVCodecParser; AVCodecParser *av_parser_next(AVCodecParser *c); void av_register_codec_parser(AVCodecParser *parser); AVCodecParserContext *av_parser_init(int codec_id); /** * Parse a packet. * * @param s parser context. * @param avctx codec context. * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished. * @param poutbuf_size set to size of parsed buffer or zero if not yet finished. * @param buf input buffer. * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output). * @param pts input presentation timestamp. * @param dts input decoding timestamp. * @param pos input byte position in stream. * @return the number of bytes of the input bitstream used. * * Example: * @code * while(in_len){ * len = av_parser_parse2(myparser, AVCodecContext, &data, &size, * in_data, in_len, * pts, dts, pos); * in_data += len; * in_len -= len; * * if(size) * decode_frame(data, size); * } * @endcode */ int av_parser_parse2(AVCodecParserContext *s, AVCodecContext *avctx, uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size, int64_t pts, int64_t dts, int64_t pos); int av_parser_change(AVCodecParserContext *s, AVCodecContext *avctx, uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size, int keyframe); void av_parser_close(AVCodecParserContext *s); typedef struct AVBitStreamFilterContext { void *priv_data; struct AVBitStreamFilter *filter; AVCodecParserContext *parser; struct AVBitStreamFilterContext *next; } AVBitStreamFilterContext; typedef struct AVBitStreamFilter { const char *name; int priv_data_size; int (*filter)(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args, uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size, int keyframe); void (*close)(AVBitStreamFilterContext *bsfc); struct AVBitStreamFilter *next; } AVBitStreamFilter; void av_register_bitstream_filter(AVBitStreamFilter *bsf); AVBitStreamFilterContext *av_bitstream_filter_init(const char *name); int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args, uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size, int keyframe); void av_bitstream_filter_close(AVBitStreamFilterContext *bsf); AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f); /* memory */ /** * Reallocate the given block if it is not large enough, otherwise do nothing. * * @see av_realloc */ void *av_fast_realloc(void *ptr, unsigned int *size, size_t min_size); /** * Allocate a buffer, reusing the given one if large enough. * * Contrary to av_fast_realloc the current buffer contents might not be * preserved and on error the old buffer is freed, thus no special * handling to avoid memleaks is necessary. * * @param ptr pointer to pointer to already allocated buffer, overwritten with pointer to new buffer * @param size size of the buffer *ptr points to * @param min_size minimum size of *ptr buffer after returning, *ptr will be NULL and * *size 0 if an error occurred. */ void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size); /** * Copy image src to dst. Wraps av_picture_data_copy() above. */ void av_picture_copy(AVPicture *dst, const AVPicture *src, enum PixelFormat pix_fmt, int width, int height); /** * Crop image top and left side. */ int av_picture_crop(AVPicture *dst, const AVPicture *src, enum PixelFormat pix_fmt, int top_band, int left_band); /** * Pad image. */ int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum PixelFormat pix_fmt, int padtop, int padbottom, int padleft, int padright, int *color); /** * Encode extradata length to a buffer. Used by xiph codecs. * * @param s buffer to write to; must be at least (v/255+1) bytes long * @param v size of extradata in bytes * @return number of bytes written to the buffer. */ unsigned int av_xiphlacing(unsigned char *s, unsigned int v); /** * Logs a generic warning message about a missing feature. This function is * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.) * only, and would normally not be used by applications. * @param[in] avc a pointer to an arbitrary struct of which the first field is * a pointer to an AVClass struct * @param[in] feature string containing the name of the missing feature * @param[in] want_sample indicates if samples are wanted which exhibit this feature. * If want_sample is non-zero, additional verbage will be added to the log * message which tells the user how to report samples to the development * mailing list. */ void av_log_missing_feature(void *avc, const char *feature, int want_sample); /** * Log a generic warning message asking for a sample. This function is * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.) * only, and would normally not be used by applications. * @param[in] avc a pointer to an arbitrary struct of which the first field is * a pointer to an AVClass struct * @param[in] msg string containing an optional message, or NULL if no message */ void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3); /** * Register the hardware accelerator hwaccel. */ void av_register_hwaccel(AVHWAccel *hwaccel); /** * If hwaccel is NULL, returns the first registered hardware accelerator, * if hwaccel is non-NULL, returns the next registered hardware accelerator * after hwaccel, or NULL if hwaccel is the last one. */ AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel); /** * Lock operation used by lockmgr */ enum AVLockOp { AV_LOCK_CREATE, ///< Create a mutex AV_LOCK_OBTAIN, ///< Lock the mutex AV_LOCK_RELEASE, ///< Unlock the mutex AV_LOCK_DESTROY, ///< Free mutex resources }; /** * Register a user provided lock manager supporting the operations * specified by AVLockOp. mutex points to a (void *) where the * lockmgr should store/get a pointer to a user allocated mutex. It's * NULL upon AV_LOCK_CREATE and != NULL for all other ops. * * @param cb User defined callback. Note: FFmpeg may invoke calls to this * callback during the call to av_lockmgr_register(). * Thus, the application must be prepared to handle that. * If cb is set to NULL the lockmgr will be unregistered. * Also note that during unregistration the previously registered * lockmgr callback may also be invoked. */ int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op)); /** * Get the type of the given codec. */ enum AVMediaType avcodec_get_type(enum CodecID codec_id); /** * Get the AVClass for AVCodecContext. It can be used in combination with * AV_OPT_SEARCH_FAKE_OBJ for examining options. * * @see av_opt_find(). */ const AVClass *avcodec_get_class(void); /** * Get the AVClass for AVFrame. It can be used in combination with * AV_OPT_SEARCH_FAKE_OBJ for examining options. * * @see av_opt_find(). */ const AVClass *avcodec_get_frame_class(void); #endif /* AVCODEC_AVCODEC_H */