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 "mpeg12data.h"
38 #include "mpeg12dec.h"
39 #include "mpegvideodata.h"
40 #include "startcode.h"
41 
42 static const uint8_t table_mb_ptype[7][2] = {
43  { 3, 5 }, // 0x01 MB_INTRA
44  { 1, 2 }, // 0x02 MB_PAT
45  { 1, 3 }, // 0x08 MB_FOR
46  { 1, 1 }, // 0x0A MB_FOR|MB_PAT
47  { 1, 6 }, // 0x11 MB_QUANT|MB_INTRA
48  { 1, 5 }, // 0x12 MB_QUANT|MB_PAT
49  { 2, 5 }, // 0x1A MB_QUANT|MB_FOR|MB_PAT
50 };
51 
52 static const uint8_t table_mb_btype[11][2] = {
53  { 3, 5 }, // 0x01 MB_INTRA
54  { 2, 3 }, // 0x04 MB_BACK
55  { 3, 3 }, // 0x06 MB_BACK|MB_PAT
56  { 2, 4 }, // 0x08 MB_FOR
57  { 3, 4 }, // 0x0A MB_FOR|MB_PAT
58  { 2, 2 }, // 0x0C MB_FOR|MB_BACK
59  { 3, 2 }, // 0x0E MB_FOR|MB_BACK|MB_PAT
60  { 1, 6 }, // 0x11 MB_QUANT|MB_INTRA
61  { 2, 6 }, // 0x16 MB_QUANT|MB_BACK|MB_PAT
62  { 3, 6 }, // 0x1A MB_QUANT|MB_FOR|MB_PAT
63  { 2, 5 }, // 0x1E MB_QUANT|MB_FOR|MB_BACK|MB_PAT
64 };
65 
66 av_cold void ff_init_2d_vlc_rl(RLTable *rl, unsigned static_size, int flags)
67 {
68  int i;
69  VLCElem table[680] = { 0 };
70  VLC vlc = { .table = table, .table_allocated = static_size };
71  av_assert0(static_size <= FF_ARRAY_ELEMS(table));
72  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 | flags);
73 
74  for (i = 0; i < vlc.table_size; i++) {
75  int code = vlc.table[i].sym;
76  int len = vlc.table[i].len;
77  int level, run;
78 
79  if (len == 0) { // illegal code
80  run = 65;
81  level = MAX_LEVEL;
82  } else if (len<0) { //more bits needed
83  run = 0;
84  level = code;
85  } else {
86  if (code == rl->n) { //esc
87  run = 65;
88  level = 0;
89  } else if (code == rl->n+1) { //eob
90  run = 0;
91  level = 127;
92  } else {
93  run = rl->table_run [code] + 1;
94  level = rl->table_level[code];
95  }
96  }
97  rl->rl_vlc[0][i].len = len;
98  rl->rl_vlc[0][i].level = level;
99  rl->rl_vlc[0][i].run = run;
100  }
101 }
102 
104 {
105 
106  s->y_dc_scale_table =
107  s->c_dc_scale_table = ff_mpeg2_dc_scale_table[s->intra_dc_precision];
108 
109 }
110 
112 {
113  s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
114  s->last_dc[1] = s->last_dc[0];
115  s->last_dc[2] = s->last_dc[0];
116  memset(s->last_mv, 0, sizeof(s->last_mv));
117 }
118 
119 
120 /******************************************/
121 /* decoding */
122 
124 
127 
132 
133 static av_cold void mpeg12_init_vlcs(void)
134 {
137  ff_mpeg12_vlc_dc_lum_code, 2, 2, 512);
140  ff_mpeg12_vlc_dc_chroma_code, 2, 2, 514);
142  &ff_mpeg12_mbMotionVectorTable[0][1], 2, 1,
143  &ff_mpeg12_mbMotionVectorTable[0][0], 2, 1, 266);
145  &ff_mpeg12_mbAddrIncrTable[0][1], 2, 1,
146  &ff_mpeg12_mbAddrIncrTable[0][0], 2, 1, 538);
148  &ff_mpeg12_mbPatTable[0][1], 2, 1,
149  &ff_mpeg12_mbPatTable[0][0], 2, 1, 512);
150 
152  &table_mb_ptype[0][1], 2, 1,
153  &table_mb_ptype[0][0], 2, 1, 64);
155  &table_mb_btype[0][1], 2, 1,
156  &table_mb_btype[0][0], 2, 1, 64);
157 
158  INIT_2D_VLC_RL(ff_rl_mpeg1, 680, 0);
159  INIT_2D_VLC_RL(ff_rl_mpeg2, 674, 0);
160 }
161 
163 {
164  static AVOnce init_static_once = AV_ONCE_INIT;
165  ff_thread_once(&init_static_once, mpeg12_init_vlcs);
166 }
167 
168 #if FF_API_FLAG_TRUNCATED
169 /**
170  * Find the end of the current frame in the bitstream.
171  * @return the position of the first byte of the next frame, or -1
172  */
173 int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size, AVCodecParserContext *s)
174 {
175  int i;
176  uint32_t state = pc->state;
177 
178  /* EOF considered as end of frame */
179  if (buf_size == 0)
180  return 0;
181 
182 /*
183  0 frame start -> 1/4
184  1 first_SEQEXT -> 0/2
185  2 first field start -> 3/0
186  3 second_SEQEXT -> 2/0
187  4 searching end
188 */
189 
190  for (i = 0; i < buf_size; i++) {
191  av_assert1(pc->frame_start_found >= 0 && pc->frame_start_found <= 4);
192  if (pc->frame_start_found & 1) {
193  if (state == EXT_START_CODE && (buf[i] & 0xF0) != 0x80)
194  pc->frame_start_found--;
195  else if (state == EXT_START_CODE + 2) {
196  if ((buf[i] & 3) == 3)
197  pc->frame_start_found = 0;
198  else
199  pc->frame_start_found = (pc->frame_start_found + 1) & 3;
200  }
201  state++;
202  } else {
203  i = avpriv_find_start_code(buf + i, buf + buf_size, &state) - buf - 1;
205  i++;
206  pc->frame_start_found = 4;
207  }
208  if (state == SEQ_END_CODE) {
209  pc->frame_start_found = 0;
210  pc->state=-1;
211  return i+1;
212  }
213  if (pc->frame_start_found == 2 && state == SEQ_START_CODE)
214  pc->frame_start_found = 0;
215  if (pc->frame_start_found < 4 && state == EXT_START_CODE)
216  pc->frame_start_found++;
217  if (pc->frame_start_found == 4 && (state & 0xFFFFFF00) == 0x100) {
218  if (state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE) {
219  pc->frame_start_found = 0;
220  pc->state = -1;
221  return i - 3;
222  }
223  }
224  if (pc->frame_start_found == 0 && s && state == PICTURE_START_CODE) {
225  ff_fetch_timestamp(s, i - 3, 1, i > 3);
226  }
227  }
228  }
229  pc->state = state;
230  return END_NOT_FOUND;
231 }
232 #endif
233 
234 #define MAX_INDEX (64 - 1)
235 
237  const uint16_t *quant_matrix,
238  const uint8_t *scantable, int last_dc[3],
239  int16_t *block, int index, int qscale)
240 {
241  int dc, diff, i = 0, component;
242  RLTable *rl = &ff_rl_mpeg1;
243 
244  /* DC coefficient */
245  component = index <= 3 ? 0 : index - 4 + 1;
246 
247  diff = decode_dc(gb, component);
248  if (diff >= 0xffff)
249  return AVERROR_INVALIDDATA;
250 
251  dc = last_dc[component];
252  dc += diff;
253  last_dc[component] = dc;
254 
255  block[0] = dc * quant_matrix[0];
256 
257  {
258  OPEN_READER(re, gb);
259  UPDATE_CACHE(re, gb);
260  if (((int32_t)GET_CACHE(re, gb)) <= (int32_t)0xBFFFFFFF)
261  goto end;
262 
263  /* now quantify & encode AC coefficients */
264  while (1) {
265  int level, run, j;
266 
267  GET_RL_VLC(level, run, re, gb, rl->rl_vlc[0],
268  TEX_VLC_BITS, 2, 0);
269 
270  if (level != 0) {
271  i += run;
272  if (i > MAX_INDEX)
273  break;
274 
275  j = scantable[i];
276  level = (level * qscale * quant_matrix[j]) >> 4;
277  level = (level - 1) | 1;
278  level = (level ^ SHOW_SBITS(re, gb, 1)) -
279  SHOW_SBITS(re, gb, 1);
280  SKIP_BITS(re, gb, 1);
281  } else {
282  /* escape */
283  run = SHOW_UBITS(re, gb, 6) + 1;
284  LAST_SKIP_BITS(re, gb, 6);
285  UPDATE_CACHE(re, gb);
286  level = SHOW_SBITS(re, gb, 8);
287  SKIP_BITS(re, gb, 8);
288 
289  if (level == -128) {
290  level = SHOW_UBITS(re, gb, 8) - 256;
291  SKIP_BITS(re, gb, 8);
292  } else if (level == 0) {
293  level = SHOW_UBITS(re, gb, 8);
294  SKIP_BITS(re, gb, 8);
295  }
296 
297  i += run;
298  if (i > MAX_INDEX)
299  break;
300 
301  j = scantable[i];
302  if (level < 0) {
303  level = -level;
304  level = (level * qscale * quant_matrix[j]) >> 4;
305  level = (level - 1) | 1;
306  level = -level;
307  } else {
308  level = (level * qscale * quant_matrix[j]) >> 4;
309  level = (level - 1) | 1;
310  }
311  }
312 
313  block[j] = level;
314  if (((int32_t)GET_CACHE(re, gb)) <= (int32_t)0xBFFFFFFF)
315  break;
316 
317  UPDATE_CACHE(re, gb);
318  }
319 end:
320  LAST_SKIP_BITS(re, gb, 2);
321  CLOSE_READER(re, gb);
322  }
323 
324  if (i > MAX_INDEX)
326 
327  return i;
328 }
ff_rl_mpeg2
RLTable ff_rl_mpeg2
Definition: mpeg12data.c:174
level
uint8_t level
Definition: svq3.c:206
SEQ_END_CODE
#define SEQ_END_CODE
Definition: mpeg12.h:28
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EXT_START_CODE
#define EXT_START_CODE
Definition: cavs.h:35
ff_mbincr_vlc
VLC ff_mbincr_vlc
Definition: mpeg12.c:128
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VLC ff_dc_chroma_vlc
Definition: mpeg12.c:126
INIT_VLC_STATIC
#define INIT_VLC_STATIC(vlc, bits, a, b, c, d, e, f, g, static_size)
Definition: vlc.h:125
SLICE_MAX_START_CODE
#define SLICE_MAX_START_CODE
Definition: cavs.h:34
ff_mpeg12_common_init
av_cold void ff_mpeg12_common_init(MpegEncContext *s)
Definition: mpeg12.c:103
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static const uint8_t table_mb_btype[11][2]
Definition: mpeg12.c:52
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#define init_vlc(vlc, nb_bits, nb_codes, bits, bits_wrap, bits_size, codes, codes_wrap, codes_size, flags)
Definition: vlc.h:43
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static const uint16_t table[]
Definition: prosumer.c:206
RL_VLC_ELEM::run
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Definition: vlc.h:40
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:234
ParseContext::state
uint32_t state
contains the last few bytes in MSB order
Definition: parser.h:33
ff_mpeg12_vlc_dc_chroma_bits
const unsigned char ff_mpeg12_vlc_dc_chroma_bits[12]
Definition: mpeg12data.c:62
ff_mb_pat_vlc
VLC ff_mb_pat_vlc
Definition: mpeg12.c:131
SEQ_START_CODE
#define SEQ_START_CODE
Definition: mpeg12.h:29
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const unsigned char ff_mpeg12_vlc_dc_lum_bits[12]
Definition: mpeg12data.c:55
ff_fetch_timestamp
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
ff_mpeg12_mbAddrIncrTable
const uint8_t ff_mpeg12_mbAddrIncrTable[36][2]
Definition: mpeg12data.c:182
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Definition: parser.h:28
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Definition: rl.h:39
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Definition: get_bits.h:61
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const uint8_t ff_mpeg12_mbMotionVectorTable[17][2]
Definition: mpeg12data.c:288
VLCElem::sym
VLCBaseType sym
Definition: vlc.h:28
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int n
number of entries of table_vlc minus 1
Definition: rl.h:40
mpeg12.h
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static int ff_thread_once(char *control, void(*routine)(void))
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FF_ARRAY_ELEMS
#define FF_ARRAY_ELEMS(a)
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#define av_cold
Definition: attributes.h:90
mpeg12_init_vlcs
static av_cold void mpeg12_init_vlcs(void)
Definition: mpeg12.c:133
ff_rl_mpeg1
RLTable ff_rl_mpeg1
Definition: mpeg12data.c:166
CLOSE_READER
#define CLOSE_READER(name, gb)
Definition: get_bits.h:149
s
#define s(width, name)
Definition: cbs_vp9.c:256
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const uint8_t *const ff_mpeg2_dc_scale_table[4]
Definition: mpegvideodata.c:77
SHOW_SBITS
#define SHOW_SBITS(name, gb, num)
Definition: get_bits.h:212
av_assert0
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
SKIP_BITS
#define SKIP_BITS(name, gb, num)
Definition: get_bits.h:193
MB_PTYPE_VLC_BITS
#define MB_PTYPE_VLC_BITS
Definition: mpeg12vlc.h:39
AV_ONCE_INIT
#define AV_ONCE_INIT
Definition: thread.h:177
run
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Definition: svq3.c:205
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SLICE_MIN_START_CODE
#define SLICE_MIN_START_CODE
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Definition: parser.h:34
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Definition: vlc.h:100
LAST_SKIP_BITS
#define LAST_SKIP_BITS(name, gb, num)
Definition: get_bits.h:199
avpriv_find_start_code
const uint8_t * avpriv_find_start_code(const uint8_t *p, const uint8_t *end, uint32_t *state)
MB_BTYPE_VLC_BITS
#define MB_BTYPE_VLC_BITS
Definition: mpeg12vlc.h:40
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#define AVOnce
Definition: thread.h:176
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int index
Definition: gxfenc.c:89
RL_VLC_ELEM::len
int8_t len
Definition: vlc.h:39
ff_mb_ptype_vlc
VLC ff_mb_ptype_vlc
Definition: mpeg12.c:129
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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:173
startcode.h
RLTable::table_level
const int8_t * table_level
Definition: rl.h:44
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
ff_mpeg1_clean_buffers
void ff_mpeg1_clean_buffers(MpegEncContext *s)
Definition: mpeg12.c:111
INIT_2D_VLC_RL
#define INIT_2D_VLC_RL(rl, static_size, flags)
Definition: mpeg12dec.h:29
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
mpegvideodata.h
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:236
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:162
MB_PAT_VLC_BITS
#define MB_PAT_VLC_BITS
Definition: mpeg12vlc.h:38
len
int len
Definition: vorbis_enc_data.h:426
ff_init_2d_vlc_rl
av_cold void ff_init_2d_vlc_rl(RLTable *rl, unsigned static_size, int flags)
Definition: mpeg12.c:66
table_mb_ptype
static const uint8_t table_mb_ptype[7][2]
Definition: mpeg12.c:42
ff_mpeg12_mbPatTable
const uint8_t ff_mpeg12_mbPatTable[64][2]
Definition: mpeg12data.c:221
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:59
TEX_VLC_BITS
#define TEX_VLC_BITS
Definition: dvdec.c:133
ff_dc_lum_vlc
VLC ff_dc_lum_vlc
Definition: mpeg12.c:125
mpeg12data.h
SHOW_UBITS
#define SHOW_UBITS(name, gb, num)
Definition: get_bits.h:211
mpeg12dec.h
VLC
Definition: vlc.h:31
ff_mb_btype_vlc
VLC ff_mb_btype_vlc
Definition: mpeg12.c:130
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:123
END_NOT_FOUND
#define END_NOT_FOUND
Definition: parser.h:40
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:52
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:39
MV_VLC_BITS
#define MV_VLC_BITS
Definition: mpeg12vlc.h:34
MpegEncContext
MpegEncContext.
Definition: mpegvideo.h:62
decode_dc
static int decode_dc(GetBitContext *gb, int component)
Definition: mpeg12dec.h:38
RLTable::table_run
const int8_t * table_run
Definition: rl.h:43
RLTable::rl_vlc
RL_VLC_ELEM * rl_vlc[32]
decoding only
Definition: rl.h:48
RL_VLC_ELEM::level
int16_t level
Definition: vlc.h:38
MBINCR_VLC_BITS
#define MBINCR_VLC_BITS
Definition: mpeg12vlc.h:37
re
float re
Definition: fft.c:79