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172 lines
6.1 KiB
172 lines
6.1 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 Libav. |
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* |
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* Libav 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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* Libav 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 Libav; 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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#include "dsputil.h" |
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#include "get_bits.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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typedef struct DVVideoContext { |
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const DVprofile *sys; |
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AVFrame picture; |
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AVCodecContext *avctx; |
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uint8_t *buf; |
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uint8_t dv_zigzag[2][64]; |
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void (*get_pixels)(DCTELEM *block, const uint8_t *pixels, int line_size); |
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void (*fdct[2])(DCTELEM *block); |
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void (*idct_put[2])(uint8_t *dest, int line_size, DCTELEM *block); |
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me_cmp_func ildct_cmp; |
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} DVVideoContext; |
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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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extern const uint8_t ff_dv_quant_shifts[22][4]; |
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extern const uint8_t ff_dv_quant_offset[4]; |
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extern const int ff_dv_iweight_88[64]; |
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extern const int ff_dv_iweight_248[64]; |
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extern const int ff_dv_iweight_1080_y[64]; |
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extern const int ff_dv_iweight_1080_c[64]; |
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extern const int ff_dv_iweight_720_y[64]; |
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extern const int ff_dv_iweight_720_c[64]; |
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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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#define TEX_VLC_BITS 9 |
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extern RL_VLC_ELEM ff_dv_rl_vlc[1184]; |
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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_codec_profile(AVCodecContext* codec); |
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int ff_dv_init_dynamic_tables(const DVprofile *d); |
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int ff_dvvideo_init(AVCodecContext *avctx); |
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static inline int dv_work_pool_size(const DVprofile *d) |
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{ |
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int size = d->n_difchan*d->difseg_size*27; |
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if (DV_PROFILE_IS_1080i50(d)) |
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size -= 3*27; |
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if (DV_PROFILE_IS_720p50(d)) |
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size -= 4*27; |
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return size; |
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} |
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static inline void dv_calculate_mb_xy(DVVideoContext *s, DVwork_chunk *work_chunk, int m, int *mb_x, int *mb_y) |
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{ |
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*mb_x = work_chunk->mb_coordinates[m] & 0xff; |
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*mb_y = work_chunk->mb_coordinates[m] >> 8; |
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/* We work with 720p frames split in half. The odd half-frame (chan==2,3) is displaced :-( */ |
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if (s->sys->height == 720 && !(s->buf[1]&0x0C)) { |
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*mb_y -= (*mb_y>17)?18:-72; /* shifting the Y coordinate down by 72/2 macro blocks */ |
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} |
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} |
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/** |
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* Print all allowed DV profiles into logctx at specified logging level. |
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*/ |
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void ff_dv_print_profiles(void *logctx, int loglevel); |
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#endif /* AVCODEC_DVDATA_H */
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