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115 lines
4.5 KiB
115 lines
4.5 KiB
/* |
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* Constants for DV codec |
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* Copyright (c) 2002 Fabrice Bellard |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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/** |
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* @file |
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* Constants for DV codec. |
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*/ |
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#ifndef AVCODEC_DVDATA_H |
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#define AVCODEC_DVDATA_H |
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#include "libavutil/rational.h" |
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#include "avcodec.h" |
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typedef struct DVwork_chunk { |
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uint16_t buf_offset; |
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uint16_t mb_coordinates[5]; |
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} DVwork_chunk; |
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/* |
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* DVprofile is used to express the differences between various |
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* DV flavors. For now it's primarily used for differentiating |
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* 525/60 and 625/50, but the plans are to use it for various |
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* DV specs as well (e.g. SMPTE314M vs. IEC 61834). |
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*/ |
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typedef struct DVprofile { |
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int dsf; /* value of the dsf in the DV header */ |
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int video_stype; /* stype for VAUX source pack */ |
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int frame_size; /* total size of one frame in bytes */ |
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int difseg_size; /* number of DIF segments per DIF channel */ |
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int n_difchan; /* number of DIF channels per frame */ |
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AVRational time_base; /* 1/framerate */ |
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int ltc_divisor; /* FPS from the LTS standpoint */ |
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int height; /* picture height in pixels */ |
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int width; /* picture width in pixels */ |
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AVRational sar[2]; /* sample aspect ratios for 4:3 and 16:9 */ |
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DVwork_chunk *work_chunks; /* each thread gets its own chunk of frame to work on */ |
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uint32_t *idct_factor; /* set of iDCT factor tables */ |
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enum PixelFormat pix_fmt; /* picture pixel format */ |
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int bpm; /* blocks per macroblock */ |
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const uint8_t *block_sizes; /* AC block sizes, in bits */ |
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int audio_stride; /* size of audio_shuffle table */ |
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int audio_min_samples[3]; /* min amount of audio samples */ |
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/* for 48kHz, 44.1kHz and 32kHz */ |
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int audio_samples_dist[5]; /* how many samples are supposed to be */ |
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/* in each frame in a 5 frames window */ |
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const uint8_t (*audio_shuffle)[9]; /* PCM shuffling table */ |
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} DVprofile; |
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enum dv_section_type { |
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dv_sect_header = 0x1f, |
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dv_sect_subcode = 0x3f, |
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dv_sect_vaux = 0x56, |
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dv_sect_audio = 0x76, |
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dv_sect_video = 0x96, |
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}; |
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enum dv_pack_type { |
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dv_header525 = 0x3f, /* see dv_write_pack for important details on */ |
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dv_header625 = 0xbf, /* these two packs */ |
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dv_timecode = 0x13, |
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dv_audio_source = 0x50, |
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dv_audio_control = 0x51, |
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dv_audio_recdate = 0x52, |
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dv_audio_rectime = 0x53, |
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dv_video_source = 0x60, |
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dv_video_control = 0x61, |
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dv_video_recdate = 0x62, |
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dv_video_rectime = 0x63, |
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dv_unknown_pack = 0xff, |
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}; |
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#define DV_PROFILE_IS_HD(p) ((p)->video_stype & 0x10) |
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#define DV_PROFILE_IS_1080i50(p) (((p)->video_stype == 0x14) && ((p)->dsf == 1)) |
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#define DV_PROFILE_IS_720p50(p) (((p)->video_stype == 0x18) && ((p)->dsf == 1)) |
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/* minimum number of bytes to read from a DV stream in order to |
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determine the profile */ |
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#define DV_PROFILE_BYTES (6*80) /* 6 DIF blocks */ |
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/** |
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* largest possible DV frame, in bytes (1080i50) |
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*/ |
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#define DV_MAX_FRAME_SIZE 576000 |
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/** |
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* maximum number of blocks per macroblock in any DV format |
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*/ |
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#define DV_MAX_BPM 8 |
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const DVprofile* avpriv_dv_frame_profile(const DVprofile *sys, |
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const uint8_t* frame, unsigned buf_size); |
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const DVprofile* avpriv_dv_frame_profile2(AVCodecContext* codec, const DVprofile *sys, |
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const uint8_t* frame, unsigned buf_size); |
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const DVprofile* avpriv_dv_codec_profile(AVCodecContext* codec); |
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#endif /* AVCODEC_DVDATA_H */
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