FFmpeg
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/thread.h"
33 
34 #include "avcodec.h"
35 #include "mpegvideo.h"
36 #include "mpeg12.h"
37 #include "mpeg12codecs.h"
38 #include "mpeg12data.h"
39 #include "mpeg12dec.h"
40 #include "rl.h"
41 #include "startcode.h"
42 
43 static const uint8_t table_mb_ptype[7][2] = {
44  { 3, 5 }, // 0x01 MB_INTRA
45  { 1, 2 }, // 0x02 MB_PAT
46  { 1, 3 }, // 0x08 MB_FOR
47  { 1, 1 }, // 0x0A MB_FOR|MB_PAT
48  { 1, 6 }, // 0x11 MB_QUANT|MB_INTRA
49  { 1, 5 }, // 0x12 MB_QUANT|MB_PAT
50  { 2, 5 }, // 0x1A MB_QUANT|MB_FOR|MB_PAT
51 };
52 
53 static const uint8_t table_mb_btype[11][2] = {
54  { 3, 5 }, // 0x01 MB_INTRA
55  { 2, 3 }, // 0x04 MB_BACK
56  { 3, 3 }, // 0x06 MB_BACK|MB_PAT
57  { 2, 4 }, // 0x08 MB_FOR
58  { 3, 4 }, // 0x0A MB_FOR|MB_PAT
59  { 2, 2 }, // 0x0C MB_FOR|MB_BACK
60  { 3, 2 }, // 0x0E MB_FOR|MB_BACK|MB_PAT
61  { 1, 6 }, // 0x11 MB_QUANT|MB_INTRA
62  { 2, 6 }, // 0x16 MB_QUANT|MB_BACK|MB_PAT
63  { 3, 6 }, // 0x1A MB_QUANT|MB_FOR|MB_PAT
64  { 2, 5 }, // 0x1E MB_QUANT|MB_FOR|MB_BACK|MB_PAT
65 };
66 
67 av_cold void ff_init_2d_vlc_rl(const uint16_t table_vlc[][2], RL_VLC_ELEM rl_vlc[],
68  const int8_t table_run[], const uint8_t table_level[],
69  int n, unsigned static_size, int flags)
70 {
71  int i;
72  VLCElem table[680] = { 0 };
73  VLC vlc = { .table = table, .table_allocated = static_size };
74  av_assert0(static_size <= FF_ARRAY_ELEMS(table));
75  init_vlc(&vlc, TEX_VLC_BITS, n + 2, &table_vlc[0][1], 4, 2, &table_vlc[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC | flags);
76 
77  for (i = 0; i < vlc.table_size; i++) {
78  int code = vlc.table[i].sym;
79  int len = vlc.table[i].len;
80  int level, run;
81 
82  if (len == 0) { // illegal code
83  run = 65;
84  level = MAX_LEVEL;
85  } else if (len<0) { //more bits needed
86  run = 0;
87  level = code;
88  } else {
89  if (code == n) { //esc
90  run = 65;
91  level = 0;
92  } else if (code == n + 1) { //eob
93  run = 0;
94  level = 127;
95  } else {
96  run = table_run [code] + 1;
97  level = table_level[code];
98  }
99  }
100  rl_vlc[i].len = len;
101  rl_vlc[i].level = level;
102  rl_vlc[i].run = run;
103  }
104 }
105 
107 {
108  s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
109  s->last_dc[1] = s->last_dc[0];
110  s->last_dc[2] = s->last_dc[0];
111  memset(s->last_mv, 0, sizeof(s->last_mv));
112 }
113 
114 
115 /******************************************/
116 /* decoding */
117 
119 
122 
127 
130 
131 static av_cold void mpeg12_init_vlcs(void)
132 {
135  ff_mpeg12_vlc_dc_lum_code, 2, 2, 512);
138  ff_mpeg12_vlc_dc_chroma_code, 2, 2, 514);
140  &ff_mpeg12_mbMotionVectorTable[0][1], 2, 1,
141  &ff_mpeg12_mbMotionVectorTable[0][0], 2, 1, 266);
143  &ff_mpeg12_mbAddrIncrTable[0][1], 2, 1,
144  &ff_mpeg12_mbAddrIncrTable[0][0], 2, 1, 538);
146  &ff_mpeg12_mbPatTable[0][1], 2, 1,
147  &ff_mpeg12_mbPatTable[0][0], 2, 1, 512);
148 
150  &table_mb_ptype[0][1], 2, 1,
151  &table_mb_ptype[0][0], 2, 1, 64);
153  &table_mb_btype[0][1], 2, 1,
154  &table_mb_btype[0][0], 2, 1, 64);
155 
162 }
163 
165 {
166  static AVOnce init_static_once = AV_ONCE_INIT;
167  ff_thread_once(&init_static_once, mpeg12_init_vlcs);
168 }
169 
170 #if FF_API_FLAG_TRUNCATED
171 /**
172  * Find the end of the current frame in the bitstream.
173  * @return the position of the first byte of the next frame, or -1
174  */
175 int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size, AVCodecParserContext *s)
176 {
177  int i;
178  uint32_t state = pc->state;
179 
180  /* EOF considered as end of frame */
181  if (buf_size == 0)
182  return 0;
183 
184 /*
185  0 frame start -> 1/4
186  1 first_SEQEXT -> 0/2
187  2 first field start -> 3/0
188  3 second_SEQEXT -> 2/0
189  4 searching end
190 */
191 
192  for (i = 0; i < buf_size; i++) {
193  av_assert1(pc->frame_start_found >= 0 && pc->frame_start_found <= 4);
194  if (pc->frame_start_found & 1) {
195  if (state == EXT_START_CODE && (buf[i] & 0xF0) != 0x80)
196  pc->frame_start_found--;
197  else if (state == EXT_START_CODE + 2) {
198  if ((buf[i] & 3) == 3)
199  pc->frame_start_found = 0;
200  else
201  pc->frame_start_found = (pc->frame_start_found + 1) & 3;
202  }
203  state++;
204  } else {
205  i = avpriv_find_start_code(buf + i, buf + buf_size, &state) - buf - 1;
207  i++;
208  pc->frame_start_found = 4;
209  }
210  if (state == SEQ_END_CODE) {
211  pc->frame_start_found = 0;
212  pc->state=-1;
213  return i+1;
214  }
215  if (pc->frame_start_found == 2 && state == SEQ_START_CODE)
216  pc->frame_start_found = 0;
217  if (pc->frame_start_found < 4 && state == EXT_START_CODE)
218  pc->frame_start_found++;
219  if (pc->frame_start_found == 4 && (state & 0xFFFFFF00) == 0x100) {
220  if (state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE) {
221  pc->frame_start_found = 0;
222  pc->state = -1;
223  return i - 3;
224  }
225  }
226  if (pc->frame_start_found == 0 && s && state == PICTURE_START_CODE) {
227  ff_fetch_timestamp(s, i - 3, 1, i > 3);
228  }
229  }
230  }
231  pc->state = state;
232  return END_NOT_FOUND;
233 }
234 #endif
235 
236 #define MAX_INDEX (64 - 1)
237 
239  const uint16_t *quant_matrix,
240  const uint8_t *scantable, int last_dc[3],
241  int16_t *block, int index, int qscale)
242 {
243  int dc, diff, i = 0, component;
244 
245  /* DC coefficient */
246  component = index <= 3 ? 0 : index - 4 + 1;
247 
248  diff = decode_dc(gb, component);
249  if (diff >= 0xffff)
250  return AVERROR_INVALIDDATA;
251 
252  dc = last_dc[component];
253  dc += diff;
254  last_dc[component] = dc;
255 
256  block[0] = dc * quant_matrix[0];
257 
258  {
259  OPEN_READER(re, gb);
260  UPDATE_CACHE(re, gb);
261  if (((int32_t)GET_CACHE(re, gb)) <= (int32_t)0xBFFFFFFF)
262  goto end;
263 
264  /* now quantify & encode AC coefficients */
265  while (1) {
266  int level, run, j;
267 
269  TEX_VLC_BITS, 2, 0);
270 
271  if (level != 0) {
272  i += run;
273  if (i > MAX_INDEX)
274  break;
275 
276  j = scantable[i];
277  level = (level * qscale * quant_matrix[j]) >> 4;
278  level = (level - 1) | 1;
279  level = (level ^ SHOW_SBITS(re, gb, 1)) -
280  SHOW_SBITS(re, gb, 1);
281  SKIP_BITS(re, gb, 1);
282  } else {
283  /* escape */
284  run = SHOW_UBITS(re, gb, 6) + 1;
285  LAST_SKIP_BITS(re, gb, 6);
286  UPDATE_CACHE(re, gb);
287  level = SHOW_SBITS(re, gb, 8);
288  SKIP_BITS(re, gb, 8);
289 
290  if (level == -128) {
291  level = SHOW_UBITS(re, gb, 8) - 256;
292  SKIP_BITS(re, gb, 8);
293  } else if (level == 0) {
294  level = SHOW_UBITS(re, gb, 8);
295  SKIP_BITS(re, gb, 8);
296  }
297 
298  i += run;
299  if (i > MAX_INDEX)
300  break;
301 
302  j = scantable[i];
303  if (level < 0) {
304  level = -level;
305  level = (level * qscale * quant_matrix[j]) >> 4;
306  level = (level - 1) | 1;
307  level = -level;
308  } else {
309  level = (level * qscale * quant_matrix[j]) >> 4;
310  level = (level - 1) | 1;
311  }
312  }
313 
314  block[j] = level;
315  if (((int32_t)GET_CACHE(re, gb)) <= (int32_t)0xBFFFFFFF)
316  break;
317 
318  UPDATE_CACHE(re, gb);
319  }
320 end:
321  LAST_SKIP_BITS(re, gb, 2);
322  CLOSE_READER(re, gb);
323  }
324 
325  if (i > MAX_INDEX)
327 
328  return i;
329 }
level
uint8_t level
Definition: svq3.c:204
SEQ_END_CODE
#define SEQ_END_CODE
Definition: mpeg12.h:28
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Definition: cavs.h:39
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Definition: mpeg12.c:123
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Definition: mpeg12.c:121
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Definition: vlc.h:125
SLICE_MAX_START_CODE
#define SLICE_MAX_START_CODE
Definition: cavs.h:38
MPEG12_RL_NB_ELEMS
#define MPEG12_RL_NB_ELEMS
Definition: mpeg12vlc.h:52
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static const uint8_t table_mb_btype[11][2]
Definition: mpeg12.c:53
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static const uint16_t table[]
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VLCElem::len
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Definition: vlc.h:28
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#define UPDATE_CACHE(name, gb)
Definition: get_bits.h:178
MAX_INDEX
#define MAX_INDEX
Definition: mpeg12.c:236
ParseContext::state
uint32_t state
contains the last few bytes in MSB order
Definition: parser.h:33
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const unsigned char ff_mpeg12_vlc_dc_chroma_bits[12]
Definition: mpeg12data.c:63
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VLC ff_mb_pat_vlc
Definition: mpeg12.c:126
SEQ_START_CODE
#define SEQ_START_CODE
Definition: mpeg12.h:29
ff_mpeg12_vlc_dc_lum_bits
const unsigned char ff_mpeg12_vlc_dc_lum_bits[12]
Definition: mpeg12data.c:56
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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:84
GET_CACHE
#define GET_CACHE(name, gb)
Definition: get_bits.h:215
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RL_VLC_ELEM ff_mpeg2_rl_vlc[674]
Definition: mpeg12.c:129
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const uint8_t ff_mpeg12_mbAddrIncrTable[36][2]
Definition: mpeg12data.c:167
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Definition: parser.h:28
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Definition: get_bits.h:61
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const uint8_t ff_mpeg12_mbMotionVectorTable[17][2]
Definition: mpeg12data.c:273
VLCElem::sym
VLCBaseType sym
Definition: vlc.h:28
avassert.h
mpeg12.h
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Definition: attributes.h:90
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static av_cold void mpeg12_init_vlcs(void)
Definition: mpeg12.c:131
CLOSE_READER
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Definition: get_bits.h:149
s
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Definition: cbs_vp9.c:256
SHOW_SBITS
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Definition: get_bits.h:212
av_assert0
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
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Definition: get_bits.h:193
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#define MB_PTYPE_VLC_BITS
Definition: mpeg12vlc.h:39
AV_ONCE_INIT
#define AV_ONCE_INIT
Definition: thread.h:182
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uint8_t run
Definition: svq3.c:203
SLICE_MIN_START_CODE
#define SLICE_MIN_START_CODE
Definition: mpeg12.h:32
ParseContext::frame_start_found
int frame_start_found
Definition: parser.h:34
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#define INIT_VLC_USE_NEW_STATIC
Definition: vlc.h:100
LAST_SKIP_BITS
#define LAST_SKIP_BITS(name, gb, num)
Definition: get_bits.h:199
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const uint8_t * avpriv_find_start_code(const uint8_t *p, const uint8_t *end, uint32_t *state)
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Definition: mpeg12.c:128
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#define MB_BTYPE_VLC_BITS
Definition: mpeg12vlc.h:40
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Definition: thread.h:181
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Definition: gxfenc.c:89
ff_mpeg12_run
const int8_t ff_mpeg12_run[MPEG12_RL_NB_ELEMS]
Definition: mpeg12data.c:150
ff_init_2d_vlc_rl
av_cold void ff_init_2d_vlc_rl(const uint16_t table_vlc[][2], RL_VLC_ELEM rl_vlc[], const int8_t table_run[], const uint8_t table_level[], int n, unsigned static_size, int flags)
Definition: mpeg12.c:67
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Definition: mpeg12.c:124
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#define MAX_LEVEL
Definition: rl.h:36
ff_mpeg1_find_frame_end
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:175
startcode.h
dc
Tag MUST be and< 10hcoeff half pel interpolation filter coefficients, hcoeff[0] are the 2 middle coefficients[1] are the next outer ones and so on, resulting in a filter like:...eff[2], hcoeff[1], hcoeff[0], hcoeff[0], hcoeff[1], hcoeff[2] ... the sign of the coefficients is not explicitly stored but alternates after each coeff and coeff[0] is positive, so ...,+,-,+,-,+,+,-,+,-,+,... hcoeff[0] is not explicitly stored but found by subtracting the sum of all stored coefficients with signs from 32 hcoeff[0]=32 - hcoeff[1] - hcoeff[2] - ... a good choice for hcoeff and htaps is htaps=6 hcoeff={40,-10, 2} an alternative which requires more computations at both encoder and decoder side and may or may not be better is htaps=8 hcoeff={42,-14, 6,-2}ref_frames minimum of the number of available reference frames and max_ref_frames for example the first frame after a key frame always has ref_frames=1spatial_decomposition_type wavelet type 0 is a 9/7 symmetric compact integer wavelet 1 is a 5/3 symmetric compact integer wavelet others are reserved stored as delta from last, last is reset to 0 if always_reset||keyframeqlog quality(logarithmic quantizer scale) stored as delta from last, last is reset to 0 if always_reset||keyframemv_scale stored as delta from last, last is reset to 0 if always_reset||keyframe FIXME check that everything works fine if this changes between framesqbias dequantization bias stored as delta from last, last is reset to 0 if always_reset||keyframeblock_max_depth maximum depth of the block tree stored as delta from last, last is reset to 0 if always_reset||keyframequant_table quantization tableHighlevel bitstream structure:==============================--------------------------------------------|Header|--------------------------------------------|------------------------------------|||Block0||||split?||||yes no||||......... intra?||||:Block01 :yes no||||:Block02 :....... ..........||||:Block03 ::y DC ::ref index:||||:Block04 ::cb DC ::motion x :||||......... :cr DC ::motion y :||||....... ..........|||------------------------------------||------------------------------------|||Block1|||...|--------------------------------------------|------------ ------------ ------------|||Y subbands||Cb subbands||Cr subbands||||--- ---||--- ---||--- ---|||||LL0||HL0||||LL0||HL0||||LL0||HL0|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||LH0||HH0||||LH0||HH0||||LH0||HH0|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||HL1||LH1||||HL1||LH1||||HL1||LH1|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||HH1||HL2||||HH1||HL2||||HH1||HL2|||||...||...||...|||------------ ------------ ------------|--------------------------------------------Decoding process:=================------------|||Subbands|------------||||------------|Intra DC||||LL0 subband prediction ------------|\ Dequantization ------------------- \||Reference frames|\ IDWT|------- -------|Motion \|||Frame 0||Frame 1||Compensation . OBMC v -------|------- -------|--------------. \------> Frame n output Frame Frame<----------------------------------/|...|------------------- Range Coder:============Binary Range Coder:------------------- The implemented range coder is an adapted version based upon "Range encoding: an algorithm for removing redundancy from a digitised message." by G. N. N. Martin. The symbols encoded by the Snow range coder are bits(0|1). The associated probabilities are not fix but change depending on the symbol mix seen so far. bit seen|new state ---------+----------------------------------------------- 0|256 - state_transition_table[256 - old_state];1|state_transition_table[old_state];state_transition_table={ 0, 0, 0, 0, 0, 0, 0, 0, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 190, 191, 192, 194, 194, 195, 196, 197, 198, 199, 200, 201, 202, 202, 204, 205, 206, 207, 208, 209, 209, 210, 211, 212, 213, 215, 215, 216, 217, 218, 219, 220, 220, 222, 223, 224, 225, 226, 227, 227, 229, 229, 230, 231, 232, 234, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 248, 0, 0, 0, 0, 0, 0, 0};FIXME Range Coding of integers:------------------------- FIXME Neighboring Blocks:===================left and top are set to the respective blocks unless they are outside of the image in which case they are set to the Null block top-left is set to the top left block unless it is outside of the image in which case it is set to the left block if this block has no larger parent block or it is at the left side of its parent block and the top right block is not outside of the image then the top right block is used for top-right else the top-left block is used Null block y, cb, cr are 128 level, ref, mx and my are 0 Motion Vector Prediction:=========================1. the motion vectors of all the neighboring blocks are scaled to compensate for the difference of reference frames scaled_mv=(mv *(256 *(current_reference+1)/(mv.reference+1))+128)> the median of the scaled top and top right vectors is used as motion vector prediction the used motion vector is the sum of the predictor and(mvx_diff, mvy_diff) *mv_scale Intra DC Prediction block[y][x] dc[1]
Definition: snow.txt:400
RL_VLC_ELEM
Definition: vlc.h:37
ff_mpeg12_level
const int8_t ff_mpeg12_level[MPEG12_RL_NB_ELEMS]
Definition: mpeg12data.c:133
ff_mpeg1_clean_buffers
void ff_mpeg1_clean_buffers(MpegEncContext *s)
Definition: mpeg12.c:106
VLCElem
Definition: vlc.h:27
PICTURE_START_CODE
#define PICTURE_START_CODE
Definition: mpeg12.h:31
OPEN_READER
#define OPEN_READER(name, gb)
Definition: get_bits.h:138
attributes.h
ff_mpeg1_decode_block_intra
int ff_mpeg1_decode_block_intra(GetBitContext *gb, const uint16_t *quant_matrix, const uint8_t *scantable, int last_dc[3], int16_t *block, int index, int qscale)
Definition: mpeg12.c:238
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
code
and forward the test the status of outputs and forward it to the corresponding return FFERROR_NOT_READY If the filters stores internally one or a few frame for some it can consider them to be part of the FIFO and delay acknowledging a status change accordingly Example code
Definition: filter_design.txt:178
av_assert1
#define av_assert1(cond)
assert() equivalent, that does not lie in speed critical code.
Definition: avassert.h:53
ff_mpeg12_init_vlcs
av_cold void ff_mpeg12_init_vlcs(void)
Definition: mpeg12.c:164
MB_PAT_VLC_BITS
#define MB_PAT_VLC_BITS
Definition: mpeg12vlc.h:38
len
int len
Definition: vorbis_enc_data.h:426
table_mb_ptype
static const uint8_t table_mb_ptype[7][2]
Definition: mpeg12.c:43
ff_mpeg12_mbPatTable
const uint8_t ff_mpeg12_mbPatTable[64][2]
Definition: mpeg12data.c:206
avcodec.h
AVCodecParserContext
Definition: avcodec.h:2800
GET_RL_VLC
#define GET_RL_VLC(level, run, name, gb, table, bits, max_depth, need_update)
Definition: get_bits.h:728
ff_mpeg12_vlc_dc_chroma_code
const uint16_t ff_mpeg12_vlc_dc_chroma_code[12]
Definition: mpeg12data.c:60
TEX_VLC_BITS
#define TEX_VLC_BITS
Definition: dvdec.c:146
ff_mpeg1_vlc_table
const uint16_t ff_mpeg1_vlc_table[MPEG12_RL_NB_ELEMS+2][2]
Definition: mpeg12data.c:67
ff_dc_lum_vlc
VLC ff_dc_lum_vlc
Definition: mpeg12.c:120
mpeg12data.h
SHOW_UBITS
#define SHOW_UBITS(name, gb, num)
Definition: get_bits.h:211
mpeg12dec.h
VLC
Definition: vlc.h:31
ff_mpeg2_vlc_table
const uint16_t ff_mpeg2_vlc_table[MPEG12_RL_NB_ELEMS+2][2]
Definition: mpeg12data.c:100
ff_mb_btype_vlc
VLC ff_mb_btype_vlc
Definition: mpeg12.c:125
VLC::table
VLCElem * table
Definition: vlc.h:33
VLC::table_size
int table_size
Definition: vlc.h:34
diff
static av_always_inline int diff(const uint32_t a, const uint32_t b)
Definition: vf_palettegen.c:139
ff_mv_vlc
VLC ff_mv_vlc
Definition: mpeg12.c:118
END_NOT_FOUND
#define END_NOT_FOUND
Definition: parser.h:40
rl.h
int32_t
int32_t
Definition: audioconvert.c:56
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:561
ff_mpeg12_vlc_dc_lum_code
const uint16_t ff_mpeg12_vlc_dc_lum_code[12]
Definition: mpeg12data.c:53
block
The exact code depends on how similar the blocks are and how related they are to the block
Definition: filter_design.txt:207
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
DC_VLC_BITS
#define DC_VLC_BITS
Definition: intrax8.c:40
MV_VLC_BITS
#define MV_VLC_BITS
Definition: mpeg12vlc.h:34
MpegEncContext
MpegEncContext.
Definition: mpegvideo.h:70
decode_dc
static int decode_dc(GetBitContext *gb, int component)
Definition: mpeg12dec.h:28
MBINCR_VLC_BITS
#define MBINCR_VLC_BITS
Definition: mpeg12vlc.h:37
re
float re
Definition: fft.c:79
rl_vlc
static VLC rl_vlc[2]
Definition: mobiclip.c:277