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mpeg12.c
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1 /*
2  * MPEG-1/2 decoder
3  * Copyright (c) 2000, 2001 Fabrice Bellard
4  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 /**
24  * @file
25  * MPEG-1/2 decoder
26  */
27 
28 #define UNCHECKED_BITSTREAM_READER 1
29 
30 #include "libavutil/attributes.h"
31 #include "libavutil/avassert.h"
32 #include "libavutil/timecode.h"
33 
34 #include "internal.h"
35 #include "avcodec.h"
36 #include "mpegvideo.h"
37 #include "error_resilience.h"
38 #include "mpeg12.h"
39 #include "mpeg12data.h"
40 #include "mpegvideodata.h"
41 #include "bytestream.h"
42 #include "thread.h"
43 
45 
46 static const uint8_t table_mb_ptype[7][2] = {
47  { 3, 5 }, // 0x01 MB_INTRA
48  { 1, 2 }, // 0x02 MB_PAT
49  { 1, 3 }, // 0x08 MB_FOR
50  { 1, 1 }, // 0x0A MB_FOR|MB_PAT
51  { 1, 6 }, // 0x11 MB_QUANT|MB_INTRA
52  { 1, 5 }, // 0x12 MB_QUANT|MB_PAT
53  { 2, 5 }, // 0x1A MB_QUANT|MB_FOR|MB_PAT
54 };
55 
56 static const uint8_t table_mb_btype[11][2] = {
57  { 3, 5 }, // 0x01 MB_INTRA
58  { 2, 3 }, // 0x04 MB_BACK
59  { 3, 3 }, // 0x06 MB_BACK|MB_PAT
60  { 2, 4 }, // 0x08 MB_FOR
61  { 3, 4 }, // 0x0A MB_FOR|MB_PAT
62  { 2, 2 }, // 0x0C MB_FOR|MB_BACK
63  { 3, 2 }, // 0x0E MB_FOR|MB_BACK|MB_PAT
64  { 1, 6 }, // 0x11 MB_QUANT|MB_INTRA
65  { 2, 6 }, // 0x16 MB_QUANT|MB_BACK|MB_PAT
66  { 3, 6 }, // 0x1A MB_QUANT|MB_FOR|MB_PAT
67  { 2, 5 }, // 0x1E MB_QUANT|MB_FOR|MB_BACK|MB_PAT
68 };
69 
70 #define INIT_2D_VLC_RL(rl, static_size)\
71 {\
72  static RL_VLC_ELEM rl_vlc_table[static_size];\
73  rl.rl_vlc[0] = rl_vlc_table;\
74  init_2d_vlc_rl(&rl, static_size);\
75 }
76 
77 static av_cold void init_2d_vlc_rl(RLTable *rl, unsigned static_size)
78 {
79  int i;
80  VLC_TYPE table[680][2] = {{0}};
81  VLC vlc = { .table = table, .table_allocated = static_size };
82  av_assert0(static_size <= FF_ARRAY_ELEMS(table));
83  init_vlc(&vlc, TEX_VLC_BITS, rl->n + 2, &rl->table_vlc[0][1], 4, 2, &rl->table_vlc[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC);
84 
85  for (i = 0; i < vlc.table_size; i++) {
86  int code = vlc.table[i][0];
87  int len = vlc.table[i][1];
88  int level, run;
89 
90  if (len == 0) { // illegal code
91  run = 65;
92  level = MAX_LEVEL;
93  } else if (len<0) { //more bits needed
94  run = 0;
95  level = code;
96  } else {
97  if (code == rl->n) { //esc
98  run = 65;
99  level = 0;
100  } else if (code == rl->n+1) { //eob
101  run = 0;
102  level = 127;
103  } else {
104  run = rl->table_run [code] + 1;
105  level = rl->table_level[code];
106  }
107  }
108  rl->rl_vlc[0][i].len = len;
109  rl->rl_vlc[0][i].level = level;
110  rl->rl_vlc[0][i].run = run;
111  }
112 }
113 
115 {
116 
117  s->y_dc_scale_table =
119 
120 }
121 
123 {
124  s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
125  s->last_dc[1] = s->last_dc[0];
126  s->last_dc[2] = s->last_dc[0];
127  memset(s->last_mv, 0, sizeof(s->last_mv));
128 }
129 
130 
131 /******************************************/
132 /* decoding */
133 
135 
138 
143 
145 {
146  static int done = 0;
147 
148  if (!done) {
149  done = 1;
150 
151  INIT_VLC_STATIC(&ff_dc_lum_vlc, DC_VLC_BITS, 12,
153  ff_mpeg12_vlc_dc_lum_code, 2, 2, 512);
154  INIT_VLC_STATIC(&ff_dc_chroma_vlc, DC_VLC_BITS, 12,
156  ff_mpeg12_vlc_dc_chroma_code, 2, 2, 514);
157  INIT_VLC_STATIC(&ff_mv_vlc, MV_VLC_BITS, 17,
158  &ff_mpeg12_mbMotionVectorTable[0][1], 2, 1,
159  &ff_mpeg12_mbMotionVectorTable[0][0], 2, 1, 518);
160  INIT_VLC_STATIC(&ff_mbincr_vlc, MBINCR_VLC_BITS, 36,
161  &ff_mpeg12_mbAddrIncrTable[0][1], 2, 1,
162  &ff_mpeg12_mbAddrIncrTable[0][0], 2, 1, 538);
163  INIT_VLC_STATIC(&ff_mb_pat_vlc, MB_PAT_VLC_BITS, 64,
164  &ff_mpeg12_mbPatTable[0][1], 2, 1,
165  &ff_mpeg12_mbPatTable[0][0], 2, 1, 512);
166 
167  INIT_VLC_STATIC(&ff_mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
168  &table_mb_ptype[0][1], 2, 1,
169  &table_mb_ptype[0][0], 2, 1, 64);
170  INIT_VLC_STATIC(&ff_mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
171  &table_mb_btype[0][1], 2, 1,
172  &table_mb_btype[0][0], 2, 1, 64);
175 
178  }
179 }
180 
181 /**
182  * Find the end of the current frame in the bitstream.
183  * @return the position of the first byte of the next frame, or -1
184  */
186 {
187  int i;
188  uint32_t state = pc->state;
189 
190  /* EOF considered as end of frame */
191  if (buf_size == 0)
192  return 0;
193 
194 /*
195  0 frame start -> 1/4
196  1 first_SEQEXT -> 0/2
197  2 first field start -> 3/0
198  3 second_SEQEXT -> 2/0
199  4 searching end
200 */
201 
202  for (i = 0; i < buf_size; i++) {
203  av_assert1(pc->frame_start_found >= 0 && pc->frame_start_found <= 4);
204  if (pc->frame_start_found & 1) {
205  if (state == EXT_START_CODE && (buf[i] & 0xF0) != 0x80)
206  pc->frame_start_found--;
207  else if (state == EXT_START_CODE + 2) {
208  if ((buf[i] & 3) == 3)
209  pc->frame_start_found = 0;
210  else
211  pc->frame_start_found = (pc->frame_start_found + 1) & 3;
212  }
213  state++;
214  } else {
215  i = avpriv_find_start_code(buf + i, buf + buf_size, &state) - buf - 1;
216  if (pc->frame_start_found == 0 && state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE) {
217  i++;
218  pc->frame_start_found = 4;
219  }
220  if (state == SEQ_END_CODE) {
221  pc->frame_start_found = 0;
222  pc->state=-1;
223  return i+1;
224  }
225  if (pc->frame_start_found == 2 && state == SEQ_START_CODE)
226  pc->frame_start_found = 0;
227  if (pc->frame_start_found < 4 && state == EXT_START_CODE)
228  pc->frame_start_found++;
229  if (pc->frame_start_found == 4 && (state & 0xFFFFFF00) == 0x100) {
230  if (state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE) {
231  pc->frame_start_found = 0;
232  pc->state = -1;
233  return i - 3;
234  }
235  }
236  if (pc->frame_start_found == 0 && s && state == PICTURE_START_CODE) {
237  ff_fetch_timestamp(s, i - 3, 1, i > 3);
238  }
239  }
240  }
241  pc->state = state;
242  return END_NOT_FOUND;
243 }
244 
245 #define MAX_INDEX (64 - 1)
246 
248  const uint16_t *quant_matrix,
249  uint8_t *const scantable, int last_dc[3],
250  int16_t *block, int index, int qscale)
251 {
252  int dc, diff, i = 0, component;
253  RLTable *rl = &ff_rl_mpeg1;
254 
255  /* DC coefficient */
256  component = index <= 3 ? 0 : index - 4 + 1;
257 
258  diff = decode_dc(gb, component);
259  if (diff >= 0xffff)
260  return AVERROR_INVALIDDATA;
261 
262  dc = last_dc[component];
263  dc += diff;
264  last_dc[component] = dc;
265 
266  block[0] = dc * quant_matrix[0];
267 
268  {
269  OPEN_READER(re, gb);
270  UPDATE_CACHE(re, gb);
271  if (((int32_t)GET_CACHE(re, gb)) <= (int32_t)0xBFFFFFFF)
272  goto end;
273 
274  /* now quantify & encode AC coefficients */
275  while (1) {
276  int level, run, j;
277 
278  GET_RL_VLC(level, run, re, gb, rl->rl_vlc[0],
279  TEX_VLC_BITS, 2, 0);
280 
281  if (level != 0) {
282  i += run;
283  if (i > MAX_INDEX)
284  break;
285 
286  j = scantable[i];
287  level = (level * qscale * quant_matrix[j]) >> 4;
288  level = (level - 1) | 1;
289  level = (level ^ SHOW_SBITS(re, gb, 1)) -
290  SHOW_SBITS(re, gb, 1);
291  SKIP_BITS(re, gb, 1);
292  } else {
293  /* escape */
294  run = SHOW_UBITS(re, gb, 6) + 1;
295  LAST_SKIP_BITS(re, gb, 6);
296  UPDATE_CACHE(re, gb);
297  level = SHOW_SBITS(re, gb, 8);
298  SKIP_BITS(re, gb, 8);
299 
300  if (level == -128) {
301  level = SHOW_UBITS(re, gb, 8) - 256;
302  SKIP_BITS(re, gb, 8);
303  } else if (level == 0) {
304  level = SHOW_UBITS(re, gb, 8);
305  SKIP_BITS(re, gb, 8);
306  }
307 
308  i += run;
309  if (i > MAX_INDEX)
310  break;
311 
312  j = scantable[i];
313  if (level < 0) {
314  level = -level;
315  level = (level * qscale * quant_matrix[j]) >> 4;
316  level = (level - 1) | 1;
317  level = -level;
318  } else {
319  level = (level * qscale * quant_matrix[j]) >> 4;
320  level = (level - 1) | 1;
321  }
322  }
323 
324  block[j] = level;
325  if (((int32_t)GET_CACHE(re, gb)) <= (int32_t)0xBFFFFFFF)
326  break;
327 
328  UPDATE_CACHE(re, gb);
329  }
330 end:
331  LAST_SKIP_BITS(re, gb, 2);
332  CLOSE_READER(re, gb);
333  }
334 
335  if (i > MAX_INDEX)
337 
338  return i;
339 }
int table_size
Definition: vlc.h:29
const char * s
Definition: avisynth_c.h:768
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
#define SLICE_MAX_START_CODE
Definition: cavs.h:32
VLC ff_dc_lum_vlc
Definition: mpeg12.c:136
const uint8_t * y_dc_scale_table
qscale -> y_dc_scale table
Definition: mpegvideo.h:185
int last_mv[2][2][2]
last MV, used for MV prediction in MPEG-1 & B-frame MPEG-4
Definition: mpegvideo.h:278
float re
Definition: fft.c:82
av_cold void ff_mpeg12_init_vlcs(void)
Definition: mpeg12.c:144
#define INIT_VLC_STATIC(vlc, bits, a, b, c, d, e, f, g, static_size)
Definition: vlc.h:57
const unsigned char ff_mpeg12_vlc_dc_lum_bits[12]
Definition: mpeg12data.c:55
void ff_mpeg1_clean_buffers(MpegEncContext *s)
Definition: mpeg12.c:122
mpegvideo header.
const uint16_t ff_mpeg12_vlc_dc_lum_code[12]
Definition: mpeg12data.c:52
const int8_t * table_level
Definition: rl.h:44
uint8_t run
Definition: svq3.c:206
#define SLICE_MIN_START_CODE
Definition: mpegvideo.h:70
int frame_start_found
Definition: parser.h:34
RLTable.
Definition: rl.h:39
Macro definitions for various function/variable attributes.
static int16_t block[64]
Definition: dct.c:113
#define INIT_2D_VLC_RL(rl, static_size)
Definition: mpeg12.c:70
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
#define MBINCR_VLC_BITS
Definition: mpeg12vlc.h:37
uint8_t
#define av_cold
Definition: attributes.h:82
RLTable ff_rl_mpeg2
Definition: mpeg12data.c:174
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
Multithreading support functions.
int intra_dc_precision
Definition: mpegvideo.h:460
static const uint8_t table_mb_ptype[7][2]
Definition: mpeg12.c:46
VLC ff_mv_vlc
Definition: mpeg12.c:134
#define MAX_LEVEL
Definition: rl.h:36
const uint8_t * avpriv_find_start_code(const uint8_t *p, const uint8_t *end, uint32_t *state)
#define MAX_INDEX
Definition: mpeg12.c:245
#define UPDATE_CACHE(name, gb)
Definition: get_bits.h:160
int last_dc[3]
last DC values for MPEG-1
Definition: mpegvideo.h:182
#define init_vlc(vlc, nb_bits, nb_codes,bits, bits_wrap, bits_size,codes, codes_wrap, codes_size,flags)
Definition: vlc.h:38
static const struct endianess table[]
const uint16_t ff_mpeg12_vlc_dc_chroma_code[12]
Definition: mpeg12data.c:59
simple assert() macros that are a bit more flexible than ISO C assert().
#define SEQ_END_CODE
Definition: mpegvideo.h:66
#define CLOSE_READER(name, gb)
Definition: get_bits.h:131
VLC ff_mb_pat_vlc
Definition: mpeg12.c:142
static int decode_dc(GetBitContext *gb, int component)
Definition: mpeg12.h:32
int8_t len
Definition: vlc.h:34
#define GET_RL_VLC(level, run, name, gb, table, bits,max_depth, need_update)
Definition: get_bits.h:494
Definition: vlc.h:26
#define SKIP_BITS(name, gb, num)
Definition: get_bits.h:175
static const uint8_t table_mb_btype[11][2]
Definition: mpeg12.c:56
const uint8_t *const ff_mpeg2_dc_scale_table[4]
Definition: mpegvideodata.c:82
int n
number of entries of table_vlc minus 1
Definition: rl.h:40
#define MB_PAT_VLC_BITS
Definition: mpeg12vlc.h:38
#define av_assert1(cond)
assert() equivalent, that does not lie in speed critical code.
Definition: avassert.h:53
const uint16_t(* table_vlc)[2]
Definition: rl.h:42
const unsigned char ff_mpeg12_vlc_dc_chroma_bits[12]
Definition: mpeg12data.c:62
RLTable ff_rl_mpeg1
Definition: mpeg12data.c:166
#define MB_BTYPE_VLC_BITS
Definition: mpeg12vlc.h:40
int32_t
const int8_t * table_run
Definition: rl.h:43
#define LAST_SKIP_BITS(name, gb, num)
Definition: get_bits.h:181
#define EXT_START_CODE
Definition: cavs.h:33
RL_VLC_ELEM * rl_vlc[32]
decoding only
Definition: rl.h:48
#define SHOW_UBITS(name, gb, num)
Definition: get_bits.h:193
#define FF_ARRAY_ELEMS(a)
static av_cold void init_2d_vlc_rl(RLTable *rl, unsigned static_size)
Definition: mpeg12.c:77
#define MV_VLC_BITS
Definition: ituh263dec.c:54
VLC ff_dc_chroma_vlc
Definition: mpeg12.c:137
Libavcodec external API header.
Timecode helpers header.
#define MB_PTYPE_VLC_BITS
Definition: mpeg12vlc.h:39
MPEG-1/2 tables.
static struct @246 state
#define OPEN_READER(name, gb)
Definition: get_bits.h:120
av_cold int ff_rl_init(RLTable *rl, uint8_t static_store[2][2 *MAX_RUN+MAX_LEVEL+3])
Definition: rl.c:39
void * buf
Definition: avisynth_c.h:690
uint32_t state
contains the last few bytes in MSB order
Definition: parser.h:33
int index
Definition: gxfenc.c:89
VLC ff_mb_ptype_vlc
Definition: mpeg12.c:140
#define GET_CACHE(name, gb)
Definition: get_bits.h:197
int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size, AVCodecParserContext *s)
Find the end of the current frame in the bitstream.
Definition: mpeg12.c:185
#define END_NOT_FOUND
Definition: parser.h:40
av_cold void ff_mpeg12_common_init(MpegEncContext *s)
Definition: mpeg12.c:114
const uint8_t * c_dc_scale_table
qscale -> c_dc_scale table
Definition: mpegvideo.h:186
uint8_t level
Definition: svq3.c:207
#define DC_VLC_BITS
Definition: intrax8.c:37
MpegEncContext.
Definition: mpegvideo.h:78
uint8_t run
Definition: vlc.h:35
#define MAX_RUN
Definition: rl.h:35
#define SHOW_SBITS(name, gb, num)
Definition: get_bits.h:194
int ff_mpeg1_decode_block_intra(GetBitContext *gb, const uint16_t *quant_matrix, uint8_t *const scantable, int last_dc[3], int16_t *block, int index, int qscale)
Definition: mpeg12.c:247
common internal api header.
#define TEX_VLC_BITS
Definition: dv.h:93
uint8_t ff_mpeg12_static_rl_table_store[2][2][2 *MAX_RUN+MAX_LEVEL+3]
Definition: mpeg12.c:44
#define INIT_VLC_USE_NEW_STATIC
Definition: vlc.h:55
VLC ff_mbincr_vlc
Definition: mpeg12.c:139
const uint8_t ff_mpeg12_mbPatTable[64][2]
Definition: mpeg12data.c:221
static av_always_inline int diff(const uint32_t a, const uint32_t b)
int len
#define SEQ_START_CODE
Definition: mpegvideo.h:67
const uint8_t ff_mpeg12_mbAddrIncrTable[36][2]
Definition: mpeg12data.c:182
VLC_TYPE(* table)[2]
code, bits
Definition: vlc.h:28
int16_t level
Definition: vlc.h:33
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(constint16_t *) pi >>8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(constint32_t *) pi >>24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(constfloat *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(constfloat *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(constfloat *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(constdouble *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(constdouble *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(constdouble *) pi *(1U<< 31))))#defineSET_CONV_FUNC_GROUP(ofmt, ifmt) staticvoidset_generic_function(AudioConvert *ac){}voidff_audio_convert_free(AudioConvert **ac){if(!*ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);}AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enumAVSampleFormatout_fmt, enumAVSampleFormatin_fmt, intchannels, intsample_rate, intapply_map){AudioConvert *ac;intin_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) returnNULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method!=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt)>2){ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc){av_free(ac);returnNULL;}returnac;}in_planar=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);if(in_planar==out_planar){ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar?ac->channels:1;}elseif(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;elseac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_AARCH64) ff_audio_convert_init_aarch64(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);returnac;}intff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in){intuse_generic=1;intlen=in->nb_samples;intp;if(ac->dc){av_log(ac->avr, AV_LOG_TRACE,"%dsamples-audio_convert:%sto%s(dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));returnff_convert_dither(ac-> dc
const uint8_t ff_mpeg12_mbMotionVectorTable[17][2]
Definition: mpeg12data.c:288
#define PICTURE_START_CODE
Definition: mpegvideo.h:69
#define VLC_TYPE
Definition: vlc.h:24
void ff_fetch_timestamp(AVCodecParserContext *s, int off, int remove, int fuzzy)
Fetch timestamps for a specific byte within the current access unit.
Definition: parser.c:105
VLC ff_mb_btype_vlc
Definition: mpeg12.c:141