FFmpeg
dvdec.c
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1 /*
2  * DV decoder
3  * Copyright (c) 2002 Fabrice Bellard
4  * Copyright (c) 2004 Roman Shaposhnik
5  *
6  * 50 Mbps (DVCPRO50) support
7  * Copyright (c) 2006 Daniel Maas <dmaas@maasdigital.com>
8  *
9  * 100 Mbps (DVCPRO HD) support
10  * Initial code by Daniel Maas <dmaas@maasdigital.com> (funded by BBC R&D)
11  * Final code by Roman Shaposhnik
12  *
13  * Many thanks to Dan Dennedy <dan@dennedy.org> for providing wealth
14  * of DV technical info.
15  *
16  * This file is part of FFmpeg.
17  *
18  * FFmpeg is free software; you can redistribute it and/or
19  * modify it under the terms of the GNU Lesser General Public
20  * License as published by the Free Software Foundation; either
21  * version 2.1 of the License, or (at your option) any later version.
22  *
23  * FFmpeg is distributed in the hope that it will be useful,
24  * but WITHOUT ANY WARRANTY; without even the implied warranty of
25  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
26  * Lesser General Public License for more details.
27  *
28  * You should have received a copy of the GNU Lesser General Public
29  * License along with FFmpeg; if not, write to the Free Software
30  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
31  */
32 
33 /**
34  * @file
35  * DV decoder
36  */
37 
38 #include "libavutil/avassert.h"
39 #include "libavutil/internal.h"
40 #include "libavutil/mem_internal.h"
41 #include "libavutil/thread.h"
42 
43 #include "avcodec.h"
44 #include "codec_internal.h"
45 #include "decode.h"
46 #include "dv.h"
47 #include "dv_internal.h"
48 #include "dv_profile_internal.h"
49 #include "dvdata.h"
50 #include "get_bits.h"
51 #include "idctdsp.h"
52 #include "put_bits.h"
53 #include "simple_idct.h"
54 #include "thread.h"
55 
56 typedef struct BlockInfo {
57  const uint32_t *factor_table;
58  const uint8_t *scan_table;
59  uint8_t pos; /* position in block */
60  void (*idct_put)(uint8_t *dest, ptrdiff_t stride, int16_t *block);
64 } BlockInfo;
65 
66 typedef struct DVDecContext {
67  const AVDVProfile *sys;
68  const AVFrame *frame;
69  const uint8_t *buf;
70 
71  uint8_t dv_zigzag[2][64];
72  DVwork_chunk work_chunks[4 * 12 * 27];
73  uint32_t idct_factor[2 * 4 * 16 * 64];
74  void (*idct_put[2])(uint8_t *dest, ptrdiff_t stride, int16_t *block);
75 
77 } DVDecContext;
78 
79 static const int dv_iweight_bits = 14;
80 
81 static const uint16_t dv_iweight_88[64] = {
82  32768, 16705, 16705, 17734, 17032, 17734, 18205, 18081,
83  18081, 18205, 18725, 18562, 19195, 18562, 18725, 19266,
84  19091, 19705, 19705, 19091, 19266, 21407, 19643, 20267,
85  20228, 20267, 19643, 21407, 22725, 21826, 20853, 20806,
86  20806, 20853, 21826, 22725, 23170, 23170, 21407, 21400,
87  21407, 23170, 23170, 24598, 23786, 22018, 22018, 23786,
88  24598, 25251, 24465, 22654, 24465, 25251, 25972, 25172,
89  25172, 25972, 26722, 27969, 26722, 29692, 29692, 31521,
90 };
91 static const uint16_t dv_iweight_248[64] = {
92  32768, 16384, 16705, 16705, 17734, 17734, 17734, 17734,
93  18081, 18081, 18725, 18725, 21407, 21407, 19091, 19091,
94  19195, 19195, 18205, 18205, 18725, 18725, 19705, 19705,
95  20267, 20267, 21826, 21826, 23170, 23170, 20806, 20806,
96  20267, 20267, 19266, 19266, 21407, 21407, 20853, 20853,
97  21400, 21400, 23786, 23786, 24465, 24465, 22018, 22018,
98  23170, 23170, 22725, 22725, 24598, 24598, 24465, 24465,
99  25172, 25172, 27969, 27969, 25972, 25972, 29692, 29692
100 };
101 
102 /**
103  * The "inverse" DV100 weights are actually just the spec weights (zig-zagged).
104  */
105 static const uint16_t dv_iweight_1080_y[64] = {
106  128, 16, 16, 17, 17, 17, 18, 18,
107  18, 18, 18, 18, 19, 18, 18, 19,
108  19, 19, 19, 19, 19, 42, 38, 40,
109  40, 40, 38, 42, 44, 43, 41, 41,
110  41, 41, 43, 44, 45, 45, 42, 42,
111  42, 45, 45, 48, 46, 43, 43, 46,
112  48, 49, 48, 44, 48, 49, 101, 98,
113  98, 101, 104, 109, 104, 116, 116, 123,
114 };
115 static const uint16_t dv_iweight_1080_c[64] = {
116  128, 16, 16, 17, 17, 17, 25, 25,
117  25, 25, 26, 25, 26, 25, 26, 26,
118  26, 27, 27, 26, 26, 42, 38, 40,
119  40, 40, 38, 42, 44, 43, 41, 41,
120  41, 41, 43, 44, 91, 91, 84, 84,
121  84, 91, 91, 96, 93, 86, 86, 93,
122  96, 197, 191, 177, 191, 197, 203, 197,
123  197, 203, 209, 219, 209, 232, 232, 246,
124 };
125 static const uint16_t dv_iweight_720_y[64] = {
126  128, 16, 16, 17, 17, 17, 18, 18,
127  18, 18, 18, 18, 19, 18, 18, 19,
128  19, 19, 19, 19, 19, 42, 38, 40,
129  40, 40, 38, 42, 44, 43, 41, 41,
130  41, 41, 43, 44, 68, 68, 63, 63,
131  63, 68, 68, 96, 92, 86, 86, 92,
132  96, 98, 96, 88, 96, 98, 202, 196,
133  196, 202, 208, 218, 208, 232, 232, 246,
134 };
135 static const uint16_t dv_iweight_720_c[64] = {
136  128, 24, 24, 26, 26, 26, 36, 36,
137  36, 36, 36, 36, 38, 36, 36, 38,
138  38, 38, 38, 38, 38, 84, 76, 80,
139  80, 80, 76, 84, 88, 86, 82, 82,
140  82, 82, 86, 88, 182, 182, 168, 168,
141  168, 182, 182, 192, 186, 192, 172, 186,
142  192, 394, 382, 354, 382, 394, 406, 394,
143  394, 406, 418, 438, 418, 464, 464, 492,
144 };
145 
146 #define TEX_VLC_BITS 10
147 
148 /* XXX: also include quantization */
149 static RL_VLC_ELEM dv_rl_vlc[1664];
150 
151 static av_cold void dv_init_static(void)
152 {
154  VLC dv_vlc = { .table = vlc_buf, .table_allocated = FF_ARRAY_ELEMS(vlc_buf) };
157  int i, j;
158 
159  /* it's faster to include sign bit in a generic VLC parsing scheme */
160  for (i = 0, j = 0; i < NB_DV_VLC; i++, j++) {
161  tmp[j].len = ff_dv_vlc_len[i];
162  tmp[j].run = ff_dv_vlc_run[i];
163  tmp[j].level = ff_dv_vlc_level[i];
164 
165  if (ff_dv_vlc_level[i]) {
166  tmp[j].len++;
167 
168  j++;
169  tmp[j].len = ff_dv_vlc_len[i] + 1;
170  tmp[j].run = ff_dv_vlc_run[i];
171  tmp[j].level = -ff_dv_vlc_level[i];
172  }
173  }
174 
175  /* NOTE: as a trick, we use the fact the no codes are unused
176  * to accelerate the parsing of partial codes */
178  &tmp[0].len, sizeof(tmp[0]),
179  NULL, 0, 0, 0, INIT_VLC_USE_NEW_STATIC, NULL);
180  av_assert1(dv_vlc.table_size == 1664);
181 
182  for (int i = 0; i < dv_vlc.table_size; i++) {
183  int code = dv_vlc.table[i].sym;
184  int len = dv_vlc.table[i].len;
185  int level, run;
186 
187  if (len < 0) { // more bits needed
188  run = 0;
189  level = code;
190  } else {
191  av_assert1(i <= code + offset);
192  run = tmp[code].run + 1;
193  level = tmp[code].level;
194  }
195  dv_rl_vlc[i].len = len;
196  dv_rl_vlc[i].level = level;
197  dv_rl_vlc[i].run = run;
198  }
199 }
200 
202 {
203  int j, i, c, s;
204  uint32_t *factor1 = &ctx->idct_factor[0],
205  *factor2 = &ctx->idct_factor[DV_PROFILE_IS_HD(d) ? 4096 : 2816];
206 
207  if (DV_PROFILE_IS_HD(d)) {
208  /* quantization quanta by QNO for DV100 */
209  static const uint8_t dv100_qstep[16] = {
210  1, /* QNO = 0 and 1 both have no quantization */
211  1,
212  2, 3, 4, 5, 6, 7, 8, 16, 18, 20, 22, 24, 28, 52
213  };
214  const uint16_t *iweight1, *iweight2;
215 
216  if (d->height == 720) {
217  iweight1 = &dv_iweight_720_y[0];
218  iweight2 = &dv_iweight_720_c[0];
219  } else {
220  iweight1 = &dv_iweight_1080_y[0];
221  iweight2 = &dv_iweight_1080_c[0];
222  }
223  for (c = 0; c < 4; c++) {
224  for (s = 0; s < 16; s++) {
225  for (i = 0; i < 64; i++) {
226  *factor1++ = (dv100_qstep[s] << (c + 9)) * iweight1[i];
227  *factor2++ = (dv100_qstep[s] << (c + 9)) * iweight2[i];
228  }
229  }
230  }
231  } else {
232  static const uint8_t dv_quant_areas[4] = { 6, 21, 43, 64 };
233  const uint16_t *iweight1 = &dv_iweight_88[0];
234  for (j = 0; j < 2; j++, iweight1 = &dv_iweight_248[0]) {
235  for (s = 0; s < 22; s++) {
236  for (i = c = 0; c < 4; c++) {
237  for (; i < dv_quant_areas[c]; i++) {
238  *factor1 = iweight1[i] << (ff_dv_quant_shifts[s][c] + 1);
239  *factor2++ = (*factor1++) << 1;
240  }
241  }
242  }
243  }
244  }
245 }
246 
248 {
249  static AVOnce init_static_once = AV_ONCE_INIT;
250  DVDecContext *s = avctx->priv_data;
251  int i;
252 
254 
255  ff_idctdsp_init(&s->idsp, avctx);
256 
257  for (i = 0; i < 64; i++)
258  s->dv_zigzag[0][i] = s->idsp.idct_permutation[ff_zigzag_direct[i]];
259 
260  if (avctx->lowres){
261  for (i = 0; i < 64; i++){
262  int j = ff_dv_zigzag248_direct[i];
263  s->dv_zigzag[1][i] = s->idsp.idct_permutation[(j & 7) + (j & 8) * 4 + (j & 48) / 2];
264  }
265  }else
266  memcpy(s->dv_zigzag[1], ff_dv_zigzag248_direct, sizeof(s->dv_zigzag[1]));
267 
268  s->idct_put[0] = s->idsp.idct_put;
269  s->idct_put[1] = ff_simple_idct248_put;
270 
271  ff_thread_once(&init_static_once, dv_init_static);
272 
273  return 0;
274 }
275 
276 /* decode AC coefficients */
277 static void dv_decode_ac(GetBitContext *gb, BlockInfo *mb, int16_t *block)
278 {
279  int last_index = gb->size_in_bits;
280  const uint8_t *scan_table = mb->scan_table;
281  const uint32_t *factor_table = mb->factor_table;
282  int pos = mb->pos;
283  int partial_bit_count = mb->partial_bit_count;
284  int level, run, vlc_len, index;
285 
286  OPEN_READER_NOSIZE(re, gb);
287  UPDATE_CACHE(re, gb);
288 
289  /* if we must parse a partial VLC, we do it here */
290  if (partial_bit_count > 0) {
291  re_cache = re_cache >> partial_bit_count |
292  mb->partial_bit_buffer;
293  re_index -= partial_bit_count;
294  mb->partial_bit_count = 0;
295  }
296 
297  /* get the AC coefficients until last_index is reached */
298  for (;;) {
299  ff_dlog(NULL, "%2d: bits=%04"PRIx32" index=%u\n",
300  pos, SHOW_UBITS(re, gb, 16), re_index);
301  /* our own optimized GET_RL_VLC */
302  index = NEG_USR32(re_cache, TEX_VLC_BITS);
303  vlc_len = dv_rl_vlc[index].len;
304  if (vlc_len < 0) {
305  index = NEG_USR32((unsigned) re_cache << TEX_VLC_BITS, -vlc_len) +
307  vlc_len = TEX_VLC_BITS - vlc_len;
308  }
310  run = dv_rl_vlc[index].run;
311 
312  /* gotta check if we're still within gb boundaries */
313  if (re_index + vlc_len > last_index) {
314  /* should be < 16 bits otherwise a codeword could have been parsed */
315  mb->partial_bit_count = last_index - re_index;
316  mb->partial_bit_buffer = re_cache & ~(-1u >> mb->partial_bit_count);
317  re_index = last_index;
318  break;
319  }
320  re_index += vlc_len;
321 
322  ff_dlog(NULL, "run=%d level=%d\n", run, level);
323  pos += run;
324  if (pos >= 64)
325  break;
326 
327  level = (level * factor_table[pos] + (1 << (dv_iweight_bits - 1))) >>
329  block[scan_table[pos]] = level;
330 
331  UPDATE_CACHE(re, gb);
332  }
333  CLOSE_READER(re, gb);
334  mb->pos = pos;
335 }
336 
337 static inline void bit_copy(PutBitContext *pb, GetBitContext *gb)
338 {
339  int bits_left = get_bits_left(gb);
340  while (bits_left >= MIN_CACHE_BITS) {
342  bits_left -= MIN_CACHE_BITS;
343  }
344  if (bits_left > 0)
345  put_bits(pb, bits_left, get_bits(gb, bits_left));
346 }
347 
348 static av_always_inline void put_block_8x4(int16_t *block, uint8_t *av_restrict p, int stride)
349 {
350  int i, j;
351 
352  for (i = 0; i < 4; i++) {
353  for (j = 0; j < 8; j++)
354  p[j] = av_clip_uint8(block[j]);
355  block += 8;
356  p += stride;
357  }
358 }
359 
361  int stride, int16_t *blocks)
362 {
363  s->idsp.idct(blocks + 0*64);
364  s->idsp.idct(blocks + 1*64);
365 
366  put_block_8x4(blocks+0*64, data, stride<<1);
367  put_block_8x4(blocks+0*64 + 4*8, data + 8, stride<<1);
368  put_block_8x4(blocks+1*64, data + stride, stride<<1);
369  put_block_8x4(blocks+1*64 + 4*8, data + 8 + stride, stride<<1);
370 }
371 
373  int stride, int16_t *blocks)
374 {
375  s->idsp.idct(blocks + 0*64);
376  s->idsp.idct(blocks + 1*64);
377  s->idsp.idct(blocks + 2*64);
378  s->idsp.idct(blocks + 3*64);
379 
380  put_block_8x4(blocks+0*64, data, stride<<1);
381  put_block_8x4(blocks+0*64 + 4*8, data + 16, stride<<1);
382  put_block_8x4(blocks+1*64, data + 8, stride<<1);
383  put_block_8x4(blocks+1*64 + 4*8, data + 24, stride<<1);
384  put_block_8x4(blocks+2*64, data + stride, stride<<1);
385  put_block_8x4(blocks+2*64 + 4*8, data + 16 + stride, stride<<1);
386  put_block_8x4(blocks+3*64, data + 8 + stride, stride<<1);
387  put_block_8x4(blocks+3*64 + 4*8, data + 24 + stride, stride<<1);
388 }
389 
390 /* mb_x and mb_y are in units of 8 pixels */
391 static int dv_decode_video_segment(AVCodecContext *avctx, void *arg)
392 {
393  const DVDecContext *s = avctx->priv_data;
394  DVwork_chunk *work_chunk = arg;
395  int quant, dc, dct_mode, class1, j;
396  int mb_index, mb_x, mb_y, last_index;
397  int y_stride, linesize;
398  int16_t *block, *block1;
399  int c_offset;
400  uint8_t *y_ptr;
401  const uint8_t *buf_ptr;
402  PutBitContext pb, vs_pb;
403  GetBitContext gb;
404  BlockInfo mb_data[5 * DV_MAX_BPM], *mb, *mb1;
405  LOCAL_ALIGNED_16(int16_t, sblock, [5 * DV_MAX_BPM], [64]);
406  LOCAL_ALIGNED_16(uint8_t, mb_bit_buffer, [80 + AV_INPUT_BUFFER_PADDING_SIZE]); /* allow some slack */
407  LOCAL_ALIGNED_16(uint8_t, vs_bit_buffer, [80 * 5 + AV_INPUT_BUFFER_PADDING_SIZE]); /* allow some slack */
408  const int log2_blocksize = 3 - avctx->lowres;
409  int is_field_mode[5];
410  int vs_bit_buffer_damaged = 0;
411  int mb_bit_buffer_damaged[5] = {0};
412  int retried = 0;
413  int sta;
414 
415  av_assert1((((uintptr_t) mb_bit_buffer) & 7) == 0);
416  av_assert1((((uintptr_t) vs_bit_buffer) & 7) == 0);
417 
418 retry:
419 
420  memset(sblock, 0, 5 * DV_MAX_BPM * sizeof(*sblock));
421 
422  /* pass 1: read DC and AC coefficients in blocks */
423  buf_ptr = &s->buf[work_chunk->buf_offset * 80];
424  block1 = &sblock[0][0];
425  mb1 = mb_data;
426  init_put_bits(&vs_pb, vs_bit_buffer, 5 * 80);
427  for (mb_index = 0; mb_index < 5; mb_index++, mb1 += s->sys->bpm, block1 += s->sys->bpm * 64) {
428  /* skip header */
429  quant = buf_ptr[3] & 0x0f;
430  if (avctx->error_concealment) {
431  if ((buf_ptr[3] >> 4) == 0x0E)
432  vs_bit_buffer_damaged = 1;
433  if (!mb_index) {
434  sta = buf_ptr[3] >> 4;
435  } else if (sta != (buf_ptr[3] >> 4))
436  vs_bit_buffer_damaged = 1;
437  }
438  buf_ptr += 4;
439  init_put_bits(&pb, mb_bit_buffer, 80);
440  mb = mb1;
441  block = block1;
442  is_field_mode[mb_index] = 0;
443  for (j = 0; j < s->sys->bpm; j++) {
444  last_index = s->sys->block_sizes[j];
445  init_get_bits(&gb, buf_ptr, last_index);
446 
447  /* get the DC */
448  dc = get_sbits(&gb, 9);
449  dct_mode = get_bits1(&gb);
450  class1 = get_bits(&gb, 2);
451  if (DV_PROFILE_IS_HD(s->sys)) {
452  mb->idct_put = s->idct_put[0];
453  mb->scan_table = s->dv_zigzag[0];
454  mb->factor_table = &s->idct_factor[(j >= 4) * 4 * 16 * 64 +
455  class1 * 16 * 64 +
456  quant * 64];
457  is_field_mode[mb_index] |= !j && dct_mode;
458  } else {
459  mb->idct_put = s->idct_put[dct_mode && log2_blocksize == 3];
460  mb->scan_table = s->dv_zigzag[dct_mode];
461  mb->factor_table =
462  &s->idct_factor[(class1 == 3) * 2 * 22 * 64 +
463  dct_mode * 22 * 64 +
464  (quant + ff_dv_quant_offset[class1]) * 64];
465  }
466  dc = dc * 4;
467  /* convert to unsigned because 128 is not added in the
468  * standard IDCT */
469  dc += 1024;
470  block[0] = dc;
471  buf_ptr += last_index >> 3;
472  mb->pos = 0;
473  mb->partial_bit_count = 0;
474 
475  ff_dlog(avctx, "MB block: %d, %d ", mb_index, j);
476  dv_decode_ac(&gb, mb, block);
477 
478  /* write the remaining bits in a new buffer only if the
479  * block is finished */
480  if (mb->pos >= 64)
481  bit_copy(&pb, &gb);
482  if (mb->pos >= 64 && mb->pos < 127)
483  vs_bit_buffer_damaged = mb_bit_buffer_damaged[mb_index] = 1;
484 
485  block += 64;
486  mb++;
487  }
488 
489  if (mb_bit_buffer_damaged[mb_index] > 0)
490  continue;
491 
492  /* pass 2: we can do it just after */
493  ff_dlog(avctx, "***pass 2 size=%d MB#=%d\n", put_bits_count(&pb), mb_index);
494  block = block1;
495  mb = mb1;
496  init_get_bits(&gb, mb_bit_buffer, put_bits_count(&pb));
497  put_bits32(&pb, 0); // padding must be zeroed
498  flush_put_bits(&pb);
499  for (j = 0; j < s->sys->bpm; j++, block += 64, mb++) {
500  if (mb->pos < 64 && get_bits_left(&gb) > 0) {
501  dv_decode_ac(&gb, mb, block);
502  /* if still not finished, no need to parse other blocks */
503  if (mb->pos < 64)
504  break;
505  if (mb->pos < 127)
506  vs_bit_buffer_damaged = mb_bit_buffer_damaged[mb_index] = 1;
507  }
508  }
509  /* all blocks are finished, so the extra bytes can be used at
510  * the video segment level */
511  if (j >= s->sys->bpm)
512  bit_copy(&vs_pb, &gb);
513  }
514 
515  /* we need a pass over the whole video segment */
516  ff_dlog(avctx, "***pass 3 size=%d\n", put_bits_count(&vs_pb));
517  block = &sblock[0][0];
518  mb = mb_data;
519  init_get_bits(&gb, vs_bit_buffer, put_bits_count(&vs_pb));
520  put_bits32(&vs_pb, 0); // padding must be zeroed
521  flush_put_bits(&vs_pb);
522  for (mb_index = 0; mb_index < 5; mb_index++) {
523  for (j = 0; j < s->sys->bpm; j++) {
524  if (mb->pos < 64 && get_bits_left(&gb) > 0 && !vs_bit_buffer_damaged) {
525  ff_dlog(avctx, "start %d:%d\n", mb_index, j);
526  dv_decode_ac(&gb, mb, block);
527  }
528 
529  if (mb->pos >= 64 && mb->pos < 127) {
530  av_log(avctx, AV_LOG_ERROR,
531  "AC EOB marker is absent pos=%d\n", mb->pos);
532  vs_bit_buffer_damaged = 1;
533  }
534  block += 64;
535  mb++;
536  }
537  }
538  if (vs_bit_buffer_damaged && !retried) {
539  av_log(avctx, AV_LOG_ERROR, "Concealing bitstream errors\n");
540  retried = 1;
541  goto retry;
542  }
543 
544  /* compute idct and place blocks */
545  block = &sblock[0][0];
546  mb = mb_data;
547  for (mb_index = 0; mb_index < 5; mb_index++) {
548  dv_calculate_mb_xy(s->sys, s->buf, work_chunk, mb_index, &mb_x, &mb_y);
549 
550  /* idct_put'ting luminance */
551  if ((s->sys->pix_fmt == AV_PIX_FMT_YUV420P) ||
552  (s->sys->pix_fmt == AV_PIX_FMT_YUV411P && mb_x >= (704 / 8)) ||
553  (s->sys->height >= 720 && mb_y != 134)) {
554  y_stride = (s->frame->linesize[0] <<
555  ((!is_field_mode[mb_index]) * log2_blocksize));
556  } else {
557  y_stride = (2 << log2_blocksize);
558  }
559  y_ptr = s->frame->data[0] +
560  ((mb_y * s->frame->linesize[0] + mb_x) << log2_blocksize);
561  if (mb_y == 134 && is_field_mode[mb_index]) {
562  dv100_idct_put_last_row_field_luma(s, y_ptr, s->frame->linesize[0], block);
563  } else {
564  linesize = s->frame->linesize[0] << is_field_mode[mb_index];
565  mb[0].idct_put(y_ptr, linesize, block + 0 * 64);
566  if (s->sys->video_stype == 4) { /* SD 422 */
567  mb[2].idct_put(y_ptr + (1 << log2_blocksize), linesize, block + 2 * 64);
568  } else {
569  mb[1].idct_put(y_ptr + (1 << log2_blocksize), linesize, block + 1 * 64);
570  mb[2].idct_put(y_ptr + y_stride, linesize, block + 2 * 64);
571  mb[3].idct_put(y_ptr + (1 << log2_blocksize) + y_stride, linesize, block + 3 * 64);
572  }
573  }
574  mb += 4;
575  block += 4 * 64;
576 
577  /* idct_put'ting chrominance */
578  c_offset = (((mb_y >> (s->sys->pix_fmt == AV_PIX_FMT_YUV420P)) * s->frame->linesize[1] +
579  (mb_x >> ((s->sys->pix_fmt == AV_PIX_FMT_YUV411P) ? 2 : 1))) << log2_blocksize);
580  for (j = 2; j; j--) {
581  uint8_t *c_ptr = s->frame->data[j] + c_offset;
582  if (s->sys->pix_fmt == AV_PIX_FMT_YUV411P && mb_x >= (704 / 8)) {
583  uint64_t aligned_pixels[64 / 8];
584  uint8_t *pixels = (uint8_t *) aligned_pixels;
585  uint8_t *c_ptr1, *ptr1;
586  int x, y;
587  mb->idct_put(pixels, 8, block);
588  for (y = 0; y < (1 << log2_blocksize); y++, c_ptr += s->frame->linesize[j], pixels += 8) {
589  ptr1 = pixels + ((1 << (log2_blocksize))>>1);
590  c_ptr1 = c_ptr + (s->frame->linesize[j] << log2_blocksize);
591  for (x = 0; x < (1 << FFMAX(log2_blocksize - 1, 0)); x++) {
592  c_ptr[x] = pixels[x];
593  c_ptr1[x] = ptr1[x];
594  }
595  }
596  block += 64;
597  mb++;
598  } else {
599  y_stride = (mb_y == 134) ? (1 << log2_blocksize) :
600  s->frame->linesize[j] << ((!is_field_mode[mb_index]) * log2_blocksize);
601  if (mb_y == 134 && is_field_mode[mb_index]) {
602  dv100_idct_put_last_row_field_chroma(s, c_ptr, s->frame->linesize[j], block);
603  mb += 2;
604  block += 2*64;
605  } else {
606  linesize = s->frame->linesize[j] << is_field_mode[mb_index];
607  (mb++)->idct_put(c_ptr, linesize, block);
608  block += 64;
609  if (s->sys->bpm == 8) {
610  (mb++)->idct_put(c_ptr + y_stride, linesize, block);
611  block += 64;
612  }
613  }
614  }
615  }
616  }
617  return 0;
618 }
619 
620 /* NOTE: exactly one frame must be given (120000 bytes for NTSC,
621  * 144000 bytes for PAL - or twice those for 50Mbps) */
623  int *got_frame, AVPacket *avpkt)
624 {
625  uint8_t *buf = avpkt->data;
626  int buf_size = avpkt->size;
627  DVDecContext *s = avctx->priv_data;
628  const uint8_t *vsc_pack;
629  int apt, is16_9, ret;
630  const AVDVProfile *sys;
631 
632  sys = ff_dv_frame_profile(avctx, s->sys, buf, buf_size);
633  if (!sys || buf_size < sys->frame_size) {
634  av_log(avctx, AV_LOG_ERROR, "could not find dv frame profile\n");
635  return -1; /* NOTE: we only accept several full frames */
636  }
637 
638  if (sys != s->sys) {
639  ret = ff_dv_init_dynamic_tables(s->work_chunks, sys);
640  if (ret < 0) {
641  av_log(avctx, AV_LOG_ERROR, "Error initializing the work tables.\n");
642  return ret;
643  }
644  dv_init_weight_tables(s, sys);
645  s->sys = sys;
646  }
647 
648  s->frame = frame;
649  frame->key_frame = 1;
650  frame->pict_type = AV_PICTURE_TYPE_I;
651  avctx->pix_fmt = s->sys->pix_fmt;
652  avctx->framerate = av_inv_q(s->sys->time_base);
653 
654  ret = ff_set_dimensions(avctx, s->sys->width, s->sys->height);
655  if (ret < 0)
656  return ret;
657 
658  /* Determine the codec's sample_aspect ratio from the packet */
659  vsc_pack = buf + 80 * 5 + 48 + 5;
660  if (*vsc_pack == DV_VIDEO_CONTROL) {
661  apt = buf[4] & 0x07;
662  is16_9 = (vsc_pack[2] & 0x07) == 0x02 ||
663  (!apt && (vsc_pack[2] & 0x07) == 0x07);
664  ff_set_sar(avctx, s->sys->sar[is16_9]);
665  }
666 
667  if ((ret = ff_thread_get_buffer(avctx, frame, 0)) < 0)
668  return ret;
669 
670  /* Determine the codec's field order from the packet */
671  if ( *vsc_pack == DV_VIDEO_CONTROL ) {
672  if (avctx->height == 720) {
673  frame->interlaced_frame = 0;
674  frame->top_field_first = 0;
675  } else if (avctx->height == 1080) {
676  frame->interlaced_frame = 1;
677  frame->top_field_first = (vsc_pack[3] & 0x40) == 0x40;
678  } else {
679  frame->interlaced_frame = (vsc_pack[3] & 0x10) == 0x10;
680  frame->top_field_first = !(vsc_pack[3] & 0x40);
681  }
682  }
683 
684  s->buf = buf;
685  avctx->execute(avctx, dv_decode_video_segment, s->work_chunks, NULL,
686  dv_work_pool_size(s->sys), sizeof(DVwork_chunk));
687 
688  emms_c();
689 
690  /* return image */
691  *got_frame = 1;
692 
693  return s->sys->frame_size;
694 }
695 
697  .p.name = "dvvideo",
698  CODEC_LONG_NAME("DV (Digital Video)"),
699  .p.type = AVMEDIA_TYPE_VIDEO,
700  .p.id = AV_CODEC_ID_DVVIDEO,
701  .priv_data_size = sizeof(DVDecContext),
705  .p.max_lowres = 3,
706 };
level
uint8_t level
Definition: svq3.c:204
DVDecContext::dv_zigzag
uint8_t dv_zigzag[2][64]
Definition: dvdec.c:71
DV_MAX_BPM
#define DV_MAX_BPM
maximum number of blocks per macroblock in any DV format
Definition: dv.h:66
get_bits_left
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:839
put_bits32
static void av_unused put_bits32(PutBitContext *s, uint32_t value)
Write exactly 32 bits into a bitstream.
Definition: put_bits.h:291
DVwork_chunk::buf_offset
uint16_t buf_offset
Definition: dv_internal.h:31
mem_internal.h
dv_init_weight_tables
static void dv_init_weight_tables(DVDecContext *ctx, const AVDVProfile *d)
Definition: dvdec.c:201
DVDecContext
Definition: dvdec.c:66
dv_profile_internal.h
u
#define u(width, name, range_min, range_max)
Definition: cbs_h2645.c:262
thread.h
ff_dv_frame_profile
const AVDVProfile * ff_dv_frame_profile(AVCodecContext *codec, const AVDVProfile *sys, const uint8_t *frame, unsigned buf_size)
Get a DV profile for the provided compressed frame.
Definition: dv_profile.c:261
NB_DV_VLC
#define NB_DV_VLC
Definition: dvdata.h:29
NB_DV_ZERO_LEVEL_ENTRIES
#define NB_DV_ZERO_LEVEL_ENTRIES
Definition: dvdata.h:31
init_put_bits
static void init_put_bits(PutBitContext *s, uint8_t *buffer, int buffer_size)
Initialize the PutBitContext s.
Definition: put_bits.h:62
BlockInfo::pos
uint8_t pos
Definition: dvdec.c:59
GetBitContext::size_in_bits
int size_in_bits
Definition: get_bits.h:68
dv100_idct_put_last_row_field_luma
static void dv100_idct_put_last_row_field_luma(const DVDecContext *s, uint8_t *data, int stride, int16_t *blocks)
Definition: dvdec.c:372
DVDecContext::frame
const AVFrame * frame
Definition: dvdec.c:68
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:325
put_bits
static void put_bits(Jpeg2000EncoderContext *s, int val, int n)
put n times val bit
Definition: j2kenc.c:221
tmp
static uint8_t tmp[11]
Definition: aes_ctr.c:28
DVwork_chunk
Definition: dv_internal.h:30
bit_copy
static void bit_copy(PutBitContext *pb, GetBitContext *gb)
Definition: dvdec.c:337
AVPacket::data
uint8_t * data
Definition: packet.h:374
RL_VLC_ELEM::run
uint8_t run
Definition: vlc.h:40
data
const char data[16]
Definition: mxf.c:146
FFCodec
Definition: codec_internal.h:119
VLCElem::len
VLCBaseType len
Definition: vlc.h:28
UPDATE_CACHE
#define UPDATE_CACHE(name, gb)
Definition: get_bits.h:178
FFMAX
#define FFMAX(a, b)
Definition: macros.h:47
ff_set_dimensions
int ff_set_dimensions(AVCodecContext *s, int width, int height)
Check that the provided frame dimensions are valid and set them on the codec context.
Definition: utils.c:91
init_get_bits
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:649
thread.h
ff_idctdsp_init
av_cold void ff_idctdsp_init(IDCTDSPContext *c, AVCodecContext *avctx)
Definition: idctdsp.c:228
OPEN_READER_NOSIZE
#define OPEN_READER_NOSIZE(name, gb)
Definition: get_bits.h:133
AVCodecContext::framerate
AVRational framerate
Definition: avcodec.h:1735
get_bits
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:379
FFCodec::p
AVCodec p
The public AVCodec.
Definition: codec_internal.h:123
GetBitContext
Definition: get_bits.h:61
ff_thread_get_buffer
the pkt_dts and pkt_pts fields in AVFrame will work as usual Restrictions on codec whose streams don t reset across will not work because their bitstreams cannot be decoded in parallel *The contents of buffers must not be read before as well as code calling up to before the decode process starts Call have so the codec calls ff_thread_report set FF_CODEC_CAP_ALLOCATE_PROGRESS in AVCodec caps_internal and use ff_thread_get_buffer() to allocate frames. The frames must then be freed with ff_thread_release_buffer(). Otherwise decode directly into the user-supplied frames. Call ff_thread_report_progress() after some part of the current picture has decoded. A good place to put this is where draw_horiz_band() is called - add this if it isn 't called anywhere
DV_VIDEO_CONTROL
@ DV_VIDEO_CONTROL
Definition: dv.h:47
VLCElem::sym
VLCBaseType sym
Definition: vlc.h:28
ff_simple_idct248_put
void ff_simple_idct248_put(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
Definition: simple_idct.c:105
dv_iweight_720_y
static const uint16_t dv_iweight_720_y[64]
Definition: dvdec.c:125
dv100_idct_put_last_row_field_chroma
static void dv100_idct_put_last_row_field_chroma(const DVDecContext *s, uint8_t *data, int stride, int16_t *blocks)
Definition: dvdec.c:360
DVDecContext::sys
const AVDVProfile * sys
Definition: dvdec.c:67
BlockInfo::partial_bit_buffer
uint32_t partial_bit_buffer
Definition: dvdec.c:62
quant
static int quant(float coef, const float Q, const float rounding)
Quantize one coefficient.
Definition: aacenc_utils.h:59
dv_iweight_88
static const uint16_t dv_iweight_88[64]
Definition: dvdec.c:81
dv_work_pool_size
static int dv_work_pool_size(const AVDVProfile *d)
Definition: dv_internal.h:37
dv_iweight_1080_y
static const uint16_t dv_iweight_1080_y[64]
The "inverse" DV100 weights are actually just the spec weights (zig-zagged).
Definition: dvdec.c:105
avassert.h
ff_thread_once
static int ff_thread_once(char *control, void(*routine)(void))
Definition: thread.h:184
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
FF_ARRAY_ELEMS
#define FF_ARRAY_ELEMS(a)
Definition: sinewin_tablegen.c:29
av_cold
#define av_cold
Definition: attributes.h:90
dv_decode_video_segment
static int dv_decode_video_segment(AVCodecContext *avctx, void *arg)
Definition: dvdec.c:391
dvvideo_decode_init
static av_cold int dvvideo_decode_init(AVCodecContext *avctx)
Definition: dvdec.c:247
CLOSE_READER
#define CLOSE_READER(name, gb)
Definition: get_bits.h:149
FF_CODEC_DECODE_CB
#define FF_CODEC_DECODE_CB(func)
Definition: codec_internal.h:298
s
#define s(width, name)
Definition: cbs_vp9.c:256
dv_decode_ac
static void dv_decode_ac(GetBitContext *gb, BlockInfo *mb, int16_t *block)
Definition: dvdec.c:277
frame_size
int frame_size
Definition: mxfenc.c:2202
init
int(* init)(AVBSFContext *ctx)
Definition: dts2pts_bsf.c:363
AVCodecContext::error_concealment
int error_concealment
error concealment flags
Definition: avcodec.h:1317
vlc_buf
static VLCElem vlc_buf[16716]
Definition: clearvideo.c:80
LOCAL_ALIGNED_16
#define LOCAL_ALIGNED_16(t, v,...)
Definition: mem_internal.h:131
BlockInfo::factor_table
const uint32_t * factor_table
Definition: dvdec.c:57
get_sbits
static int get_sbits(GetBitContext *s, int n)
Definition: get_bits.h:359
ctx
AVFormatContext * ctx
Definition: movenc.c:48
decode.h
get_bits.h
dv_calculate_mb_xy
static void dv_calculate_mb_xy(const AVDVProfile *sys, const uint8_t *buf, const DVwork_chunk *work_chunk, int m, int *mb_x, int *mb_y)
Definition: dv_internal.h:47
simple_idct.h
AV_PIX_FMT_YUV420P
@ AV_PIX_FMT_YUV420P
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:66
PutBitContext
Definition: put_bits.h:50
CODEC_LONG_NAME
#define CODEC_LONG_NAME(str)
Definition: codec_internal.h:264
arg
const char * arg
Definition: jacosubdec.c:67
dv_iweight_720_c
static const uint16_t dv_iweight_720_c[64]
Definition: dvdec.c:135
if
if(ret)
Definition: filter_design.txt:179
AV_CODEC_CAP_FRAME_THREADS
#define AV_CODEC_CAP_FRAME_THREADS
Codec supports frame-level multithreading.
Definition: codec.h:113
ff_dv_quant_shifts
const uint8_t ff_dv_quant_shifts[22][4]
Definition: dvdata.c:45
AV_ONCE_INIT
#define AV_ONCE_INIT
Definition: thread.h:182
dvvideo_decode_frame
static int dvvideo_decode_frame(AVCodecContext *avctx, AVFrame *frame, int *got_frame, AVPacket *avpkt)
Definition: dvdec.c:622
NULL
#define NULL
Definition: coverity.c:32
run
uint8_t run
Definition: svq3.c:203
idct_put
static void idct_put(FourXContext *f, int x, int y)
Definition: 4xm.c:559
AVCHROMA_LOC_TOPLEFT
@ AVCHROMA_LOC_TOPLEFT
ITU-R 601, SMPTE 274M 296M S314M(DV 4:1:1), mpeg2 4:2:2.
Definition: pixfmt.h:684
BlockInfo::idct_put
void(* idct_put)(uint8_t *dest, ptrdiff_t stride, int16_t *block)
Definition: dvdec.c:60
AV_PICTURE_TYPE_I
@ AV_PICTURE_TYPE_I
Intra.
Definition: avutil.h:274
get_bits1
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:498
ff_init_vlc_from_lengths
int ff_init_vlc_from_lengths(VLC *vlc, int nb_bits, int nb_codes, const int8_t *lens, int lens_wrap, const void *symbols, int symbols_wrap, int symbols_size, int offset, int flags, void *logctx)
Build VLC decoding tables suitable for use with get_vlc2()
Definition: vlc.c:328
ff_set_sar
int ff_set_sar(AVCodecContext *avctx, AVRational sar)
Check that the provided sample aspect ratio is valid and set it on the codec context.
Definition: utils.c:106
INIT_VLC_USE_NEW_STATIC
#define INIT_VLC_USE_NEW_STATIC
Definition: vlc.h:100
DVDecContext::idct_put
void(* idct_put[2])(uint8_t *dest, ptrdiff_t stride, int16_t *block)
Definition: dvdec.c:74
AVOnce
#define AVOnce
Definition: thread.h:181
index
int index
Definition: gxfenc.c:89
c
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
BlockInfo
Definition: dvdec.c:56
RL_VLC_ELEM::len
int8_t len
Definition: vlc.h:39
ff_dlog
#define ff_dlog(a,...)
Definition: tableprint_vlc.h:28
dv.h
AVCodecContext::lowres
int lowres
low resolution decoding, 1-> 1/2 size, 2->1/4 size
Definition: avcodec.h:1458
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:52
AVPacket::size
int size
Definition: packet.h:375
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
codec_internal.h
VLCElem
Definition: vlc.h:27
dv_rl_vlc
static RL_VLC_ELEM dv_rl_vlc[1664]
Definition: dvdec.c:149
ff_dv_zigzag248_direct
const uint8_t ff_dv_zigzag248_direct[64]
Definition: dvdata.c:33
AV_CODEC_CAP_SLICE_THREADS
#define AV_CODEC_CAP_SLICE_THREADS
Codec supports slice-based (or partition-based) multithreading.
Definition: codec.h:117
DVDecContext::idct_factor
uint32_t idct_factor[2 *4 *16 *64]
Definition: dvdec.c:73
offset
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf offset
Definition: writing_filters.txt:86
BlockInfo::shift_offset
int shift_offset
Definition: dvdec.c:63
ff_dv_vlc_level
const uint8_t ff_dv_vlc_level[NB_DV_VLC]
Definition: dvdata.c:185
dv_init_static
static av_cold void dv_init_static(void)
Definition: dvdec.c:151
DV_PROFILE_IS_HD
#define DV_PROFILE_IS_HD(p)
Definition: dv.h:53
ff_dv_vlc_run
const uint8_t ff_dv_vlc_run[NB_DV_VLC]
Definition: dvdata.c:131
mb
#define mb
Definition: vf_colormatrix.c:101
DVDecContext::work_chunks
DVwork_chunk work_chunks[4 *12 *27]
Definition: dvdec.c:72
NEG_USR32
#define NEG_USR32(a, s)
Definition: mathops.h:169
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
put_bits_count
static int put_bits_count(PutBitContext *s)
Definition: put_bits.h:80
dv_iweight_248
static const uint16_t dv_iweight_248[64]
Definition: dvdec.c:91
internal.h
av_assert1
#define av_assert1(cond)
assert() equivalent, that does not lie in speed critical code.
Definition: avassert.h:53
MIN_CACHE_BITS
#define MIN_CACHE_BITS
Definition: get_bits.h:128
av_always_inline
#define av_always_inline
Definition: attributes.h:49
AV_CODEC_ID_DVVIDEO
@ AV_CODEC_ID_DVVIDEO
Definition: codec_id.h:76
put_block_8x4
static av_always_inline void put_block_8x4(int16_t *block, uint8_t *av_restrict p, int stride)
Definition: dvdec.c:348
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:211
av_inv_q
static av_always_inline AVRational av_inv_q(AVRational q)
Invert a rational.
Definition: rational.h:159
AVCodecContext::chroma_sample_location
enum AVChromaLocation chroma_sample_location
This defines the location of chroma samples.
Definition: avcodec.h:989
BlockInfo::scan_table
const uint8_t * scan_table
Definition: dvdec.c:58
len
int len
Definition: vorbis_enc_data.h:426
DVDecContext::idsp
IDCTDSPContext idsp
Definition: dvdec.c:76
AVCodecContext::height
int height
Definition: avcodec.h:571
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:608
idctdsp.h
avcodec.h
stride
#define stride
Definition: h264pred_template.c:537
ff_zigzag_direct
const uint8_t ff_zigzag_direct[64]
Definition: mathtables.c:98
ff_dv_vlc_len
const uint8_t ff_dv_vlc_len[NB_DV_VLC]
Definition: dvdata.c:77
ret
ret
Definition: filter_design.txt:187
frame
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
Definition: filter_design.txt:264
TEX_VLC_BITS
#define TEX_VLC_BITS
Definition: dvdec.c:146
pos
unsigned int pos
Definition: spdifenc.c:412
IDCTDSPContext
Definition: idctdsp.h:44
AV_INPUT_BUFFER_PADDING_SIZE
#define AV_INPUT_BUFFER_PADDING_SIZE
Definition: defs.h:40
dv_internal.h
AVCodecContext
main external API structure.
Definition: avcodec.h:398
ff_dv_quant_offset
const uint8_t ff_dv_quant_offset[4]
Definition: dvdata.c:70
AVCodecContext::execute
int(* execute)(struct AVCodecContext *c, int(*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size)
The codec may call this to execute several independent things.
Definition: avcodec.h:1517
SHOW_UBITS
#define SHOW_UBITS(name, gb, num)
Definition: get_bits.h:211
VLC
Definition: vlc.h:31
AVDVProfile
Definition: dv_profile.h:38
VLC::table
VLCElem * table
Definition: vlc.h:33
av_clip_uint8
#define av_clip_uint8
Definition: common.h:101
VLC::table_size
int table_size
Definition: vlc.h:34
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
flush_put_bits
static void flush_put_bits(PutBitContext *s)
Pad the end of the output stream with zeros.
Definition: put_bits.h:143
dv_iweight_1080_c
static const uint16_t dv_iweight_1080_c[64]
Definition: dvdec.c:115
AVPacket
This structure stores compressed data.
Definition: packet.h:351
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:425
AV_PIX_FMT_YUV411P
@ AV_PIX_FMT_YUV411P
planar YUV 4:1:1, 12bpp, (1 Cr & Cb sample per 4x1 Y samples)
Definition: pixfmt.h:73
d
d
Definition: ffmpeg_filter.c:156
block
The exact code depends on how similar the blocks are and how related they are to the block
Definition: filter_design.txt:207
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
put_bits.h
dv_iweight_bits
static const int dv_iweight_bits
Definition: dvdec.c:79
block1
static int16_t block1[64]
Definition: dct.c:118
ff_dv_init_dynamic_tables
int ff_dv_init_dynamic_tables(DVwork_chunk *work_chunks, const AVDVProfile *d)
Definition: dv.c:169
RL_VLC_ELEM::level
int16_t level
Definition: vlc.h:38
dvdata.h
BlockInfo::partial_bit_count
uint8_t partial_bit_count
Definition: dvdec.c:61
re
float re
Definition: fft.c:79
ff_dvvideo_decoder
const FFCodec ff_dvvideo_decoder
Definition: dvdec.c:696
DVDecContext::buf
const uint8_t * buf
Definition: dvdec.c:69