mirror of https://git.ffmpeg.org/ffmpeg.git
317 lines
12 KiB
C
317 lines
12 KiB
C
/*
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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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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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/* unquant tables (not used directly) */
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static const uint8_t dv_quant_shifts[22][4] = {
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{ 3,3,4,4 },
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{ 3,3,4,4 },
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{ 2,3,3,4 },
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{ 2,3,3,4 },
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{ 2,2,3,3 },
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{ 2,2,3,3 },
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{ 1,2,2,3 },
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{ 1,2,2,3 },
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{ 1,1,2,2 },
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{ 1,1,2,2 },
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{ 0,1,1,2 },
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{ 0,1,1,2 },
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{ 0,0,1,1 },
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{ 0,0,1,1 },
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{ 0,0,0,1 },
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{ 0,0,0,0 },
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{ 0,0,0,0 },
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{ 0,0,0,0 },
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{ 0,0,0,0 },
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{ 0,0,0,0 },
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{ 0,0,0,0 },
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{ 0,0,0,0 },
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};
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static const uint8_t dv_quant_offset[4] = { 6, 3, 0, 1 };
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static const uint8_t dv_quant_areas[4] = { 6, 21, 43, 64 };
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/* quantization quanta by QNO for DV100 */
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static const uint8_t dv100_qstep[16] = {
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1, /* QNO = 0 and 1 both have no quantization */
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1,
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2, 3, 4, 5, 6, 7, 8, 16, 18, 20, 22, 24, 28, 52
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};
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/* DV25/50 DCT coefficient weights and inverse weights */
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/* created by dvtables.py */
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static const int dv_weight_bits = 18;
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static const int dv_weight_88[64] = {
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131072, 257107, 257107, 242189, 252167, 242189, 235923, 237536,
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237536, 235923, 229376, 231390, 223754, 231390, 229376, 222935,
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224969, 217965, 217965, 224969, 222935, 200636, 218652, 211916,
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212325, 211916, 218652, 200636, 188995, 196781, 205965, 206433,
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206433, 205965, 196781, 188995, 185364, 185364, 200636, 200704,
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200636, 185364, 185364, 174609, 180568, 195068, 195068, 180568,
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174609, 170091, 175557, 189591, 175557, 170091, 165371, 170627,
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170627, 165371, 160727, 153560, 160727, 144651, 144651, 136258,
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};
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static const int dv_weight_248[64] = {
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131072, 242189, 257107, 237536, 229376, 200636, 242189, 223754,
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224969, 196781, 262144, 242189, 229376, 200636, 257107, 237536,
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211916, 185364, 235923, 217965, 229376, 211916, 206433, 180568,
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242189, 223754, 224969, 196781, 211916, 185364, 235923, 217965,
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200704, 175557, 222935, 205965, 200636, 185364, 195068, 170627,
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229376, 211916, 206433, 180568, 200704, 175557, 222935, 205965,
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175557, 153560, 188995, 174609, 165371, 144651, 200636, 185364,
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195068, 170627, 175557, 153560, 188995, 174609, 165371, 144651,
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};
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static const int dv_iweight_bits = 14;
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static const int dv_iweight_88[64] = {
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32768, 16710, 16710, 17735, 17015, 17735, 18197, 18079,
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18079, 18197, 18725, 18559, 19196, 18559, 18725, 19284,
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19108, 19692, 19692, 19108, 19284, 21400, 19645, 20262,
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20214, 20262, 19645, 21400, 22733, 21845, 20867, 20815,
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20815, 20867, 21845, 22733, 23173, 23173, 21400, 21400,
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21400, 23173, 23173, 24600, 23764, 22017, 22017, 23764,
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24600, 25267, 24457, 22672, 24457, 25267, 25971, 25191,
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25191, 25971, 26715, 27962, 26715, 29642, 29642, 31536,
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};
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static const int dv_iweight_248[64] = {
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32768, 17735, 16710, 18079, 18725, 21400, 17735, 19196,
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19108, 21845, 16384, 17735, 18725, 21400, 16710, 18079,
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20262, 23173, 18197, 19692, 18725, 20262, 20815, 23764,
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17735, 19196, 19108, 21845, 20262, 23173, 18197, 19692,
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21400, 24457, 19284, 20867, 21400, 23173, 22017, 25191,
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18725, 20262, 20815, 23764, 21400, 24457, 19284, 20867,
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24457, 27962, 22733, 24600, 25971, 29642, 21400, 23173,
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22017, 25191, 24457, 27962, 22733, 24600, 25971, 29642,
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};
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/**
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* The "inverse" DV100 weights are actually just the spec weights (zig-zagged).
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*/
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static const int dv_iweight_1080_y[64] = {
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128, 16, 16, 17, 17, 17, 18, 18,
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18, 18, 18, 18, 19, 18, 18, 19,
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19, 19, 19, 19, 19, 42, 38, 40,
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40, 40, 38, 42, 44, 43, 41, 41,
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41, 41, 43, 44, 45, 45, 42, 42,
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42, 45, 45, 48, 46, 43, 43, 46,
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48, 49, 48, 44, 48, 49, 101, 98,
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98, 101, 104, 109, 104, 116, 116, 123,
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};
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static const int dv_iweight_1080_c[64] = {
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128, 16, 16, 17, 17, 17, 25, 25,
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25, 25, 26, 25, 26, 25, 26, 26,
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26, 27, 27, 26, 26, 42, 38, 40,
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40, 40, 38, 42, 44, 43, 41, 41,
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41, 41, 43, 44, 91, 91, 84, 84,
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84, 91, 91, 96, 93, 86, 86, 93,
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96, 197, 191, 177, 191, 197, 203, 197,
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197, 203, 209, 219, 209, 232, 232, 246,
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};
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static const int dv_iweight_720_y[64] = {
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128, 16, 16, 17, 17, 17, 18, 18,
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18, 18, 18, 18, 19, 18, 18, 19,
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19, 19, 19, 19, 19, 42, 38, 40,
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40, 40, 38, 42, 44, 43, 41, 41,
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41, 41, 43, 44, 68, 68, 63, 63,
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63, 68, 68, 96, 92, 86, 86, 92,
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96, 98, 96, 88, 96, 98, 202, 196,
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196, 202, 208, 218, 208, 232, 232, 246,
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};
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static const int dv_iweight_720_c[64] = {
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128, 24, 24, 26, 26, 26, 36, 36,
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36, 36, 36, 36, 38, 36, 36, 38,
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38, 38, 38, 38, 38, 84, 76, 80,
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80, 80, 76, 84, 88, 86, 82, 82,
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82, 82, 86, 88, 182, 182, 168, 168,
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168, 182, 182, 192, 186, 192, 172, 186,
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192, 394, 382, 354, 382, 394, 406, 394,
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394, 406, 418, 438, 418, 464, 464, 492,
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};
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static const uint8_t dv_audio_shuffle525[10][9] = {
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{ 0, 30, 60, 20, 50, 80, 10, 40, 70 }, /* 1st channel */
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{ 6, 36, 66, 26, 56, 86, 16, 46, 76 },
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{ 12, 42, 72, 2, 32, 62, 22, 52, 82 },
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{ 18, 48, 78, 8, 38, 68, 28, 58, 88 },
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{ 24, 54, 84, 14, 44, 74, 4, 34, 64 },
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{ 1, 31, 61, 21, 51, 81, 11, 41, 71 }, /* 2nd channel */
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{ 7, 37, 67, 27, 57, 87, 17, 47, 77 },
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{ 13, 43, 73, 3, 33, 63, 23, 53, 83 },
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{ 19, 49, 79, 9, 39, 69, 29, 59, 89 },
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{ 25, 55, 85, 15, 45, 75, 5, 35, 65 },
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};
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static const uint8_t dv_audio_shuffle625[12][9] = {
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{ 0, 36, 72, 26, 62, 98, 16, 52, 88}, /* 1st channel */
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{ 6, 42, 78, 32, 68, 104, 22, 58, 94},
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{ 12, 48, 84, 2, 38, 74, 28, 64, 100},
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{ 18, 54, 90, 8, 44, 80, 34, 70, 106},
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{ 24, 60, 96, 14, 50, 86, 4, 40, 76},
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{ 30, 66, 102, 20, 56, 92, 10, 46, 82},
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{ 1, 37, 73, 27, 63, 99, 17, 53, 89}, /* 2nd channel */
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{ 7, 43, 79, 33, 69, 105, 23, 59, 95},
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{ 13, 49, 85, 3, 39, 75, 29, 65, 101},
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{ 19, 55, 91, 9, 45, 81, 35, 71, 107},
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{ 25, 61, 97, 15, 51, 87, 5, 41, 77},
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{ 31, 67, 103, 21, 57, 93, 11, 47, 83},
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};
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static const av_unused int dv_audio_frequency[3] = {
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48000, 44100, 32000,
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};
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/* macroblock bit budgets */
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static const uint8_t block_sizes_dv2550[8] = {
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112, 112, 112, 112, 80, 80, 0, 0,
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};
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static const uint8_t block_sizes_dv100[8] = {
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80, 80, 80, 80, 80, 80, 64, 64,
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};
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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_codec_profile(AVCodecContext* codec);
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static inline int dv_write_dif_id(enum dv_section_type t, uint8_t chan_num,
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uint8_t seq_num, uint8_t dif_num,
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uint8_t* buf)
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{
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buf[0] = (uint8_t)t; /* Section type */
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buf[1] = (seq_num << 4) | /* DIF seq number 0-9 for 525/60; 0-11 for 625/50 */
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(chan_num << 3) | /* FSC: for 50Mb/s 0 - first channel; 1 - second */
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7; /* reserved -- always 1 */
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buf[2] = dif_num; /* DIF block number Video: 0-134, Audio: 0-8 */
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return 3;
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}
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static inline int dv_write_ssyb_id(uint8_t syb_num, uint8_t fr, uint8_t* buf)
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{
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if (syb_num == 0 || syb_num == 6) {
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buf[0] = (fr << 7) | /* FR ID 1 - first half of each channel; 0 - second */
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(0 << 4) | /* AP3 (Subcode application ID) */
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0x0f; /* reserved -- always 1 */
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}
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else if (syb_num == 11) {
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buf[0] = (fr << 7) | /* FR ID 1 - first half of each channel; 0 - second */
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0x7f; /* reserved -- always 1 */
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}
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else {
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buf[0] = (fr << 7) | /* FR ID 1 - first half of each channel; 0 - second */
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(0 << 4) | /* APT (Track application ID) */
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0x0f; /* reserved -- always 1 */
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}
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buf[1] = 0xf0 | /* reserved -- always 1 */
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(syb_num & 0x0f); /* SSYB number 0 - 11 */
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buf[2] = 0xff; /* reserved -- always 1 */
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return 3;
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}
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#endif /* AVCODEC_DVDATA_H */
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