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/emms.h"
40 #include "libavutil/internal.h"
41 #include "libavutil/mem_internal.h"
42 #include "libavutil/thread.h"
43 
44 #include "avcodec.h"
45 #include "codec_internal.h"
46 #include "decode.h"
47 #include "dv.h"
48 #include "dv_internal.h"
49 #include "dv_profile_internal.h"
50 #include "dvdata.h"
51 #include "get_bits.h"
52 #include "idctdsp.h"
53 #include "put_bits.h"
54 #include "simple_idct.h"
55 #include "thread.h"
56 
57 typedef struct BlockInfo {
58  const uint32_t *factor_table;
59  const uint8_t *scan_table;
60  uint8_t pos; /* position in block */
61  void (*idct_put)(uint8_t *dest, ptrdiff_t stride, int16_t *block);
65 } BlockInfo;
66 
67 typedef struct DVDecContext {
68  const AVDVProfile *sys;
69  const AVFrame *frame;
70  const uint8_t *buf;
71 
72  uint8_t dv_zigzag[2][64];
73  DVwork_chunk work_chunks[4 * 12 * 27];
74  uint32_t idct_factor[2 * 4 * 16 * 64];
75  void (*idct_put[2])(uint8_t *dest, ptrdiff_t stride, int16_t *block);
76 
78 } DVDecContext;
79 
80 static const int dv_iweight_bits = 14;
81 
82 static const uint16_t dv_iweight_88[64] = {
83  32768, 16705, 16705, 17734, 17032, 17734, 18205, 18081,
84  18081, 18205, 18725, 18562, 19195, 18562, 18725, 19266,
85  19091, 19705, 19705, 19091, 19266, 21407, 19643, 20267,
86  20228, 20267, 19643, 21407, 22725, 21826, 20853, 20806,
87  20806, 20853, 21826, 22725, 23170, 23170, 21407, 21400,
88  21407, 23170, 23170, 24598, 23786, 22018, 22018, 23786,
89  24598, 25251, 24465, 22654, 24465, 25251, 25972, 25172,
90  25172, 25972, 26722, 27969, 26722, 29692, 29692, 31521,
91 };
92 static const uint16_t dv_iweight_248[64] = {
93  32768, 16384, 16705, 16705, 17734, 17734, 17734, 17734,
94  18081, 18081, 18725, 18725, 21407, 21407, 19091, 19091,
95  19195, 19195, 18205, 18205, 18725, 18725, 19705, 19705,
96  20267, 20267, 21826, 21826, 23170, 23170, 20806, 20806,
97  20267, 20267, 19266, 19266, 21407, 21407, 20853, 20853,
98  21400, 21400, 23786, 23786, 24465, 24465, 22018, 22018,
99  23170, 23170, 22725, 22725, 24598, 24598, 24465, 24465,
100  25172, 25172, 27969, 27969, 25972, 25972, 29692, 29692
101 };
102 
103 /**
104  * The "inverse" DV100 weights are actually just the spec weights (zig-zagged).
105  */
106 static const uint16_t dv_iweight_1080_y[64] = {
107  128, 16, 16, 17, 17, 17, 18, 18,
108  18, 18, 18, 18, 19, 18, 18, 19,
109  19, 19, 19, 19, 19, 42, 38, 40,
110  40, 40, 38, 42, 44, 43, 41, 41,
111  41, 41, 43, 44, 45, 45, 42, 42,
112  42, 45, 45, 48, 46, 43, 43, 46,
113  48, 49, 48, 44, 48, 49, 101, 98,
114  98, 101, 104, 109, 104, 116, 116, 123,
115 };
116 static const uint16_t dv_iweight_1080_c[64] = {
117  128, 16, 16, 17, 17, 17, 25, 25,
118  25, 25, 26, 25, 26, 25, 26, 26,
119  26, 27, 27, 26, 26, 42, 38, 40,
120  40, 40, 38, 42, 44, 43, 41, 41,
121  41, 41, 43, 44, 91, 91, 84, 84,
122  84, 91, 91, 96, 93, 86, 86, 93,
123  96, 197, 191, 177, 191, 197, 203, 197,
124  197, 203, 209, 219, 209, 232, 232, 246,
125 };
126 static const uint16_t dv_iweight_720_y[64] = {
127  128, 16, 16, 17, 17, 17, 18, 18,
128  18, 18, 18, 18, 19, 18, 18, 19,
129  19, 19, 19, 19, 19, 42, 38, 40,
130  40, 40, 38, 42, 44, 43, 41, 41,
131  41, 41, 43, 44, 68, 68, 63, 63,
132  63, 68, 68, 96, 92, 86, 86, 92,
133  96, 98, 96, 88, 96, 98, 202, 196,
134  196, 202, 208, 218, 208, 232, 232, 246,
135 };
136 static const uint16_t dv_iweight_720_c[64] = {
137  128, 24, 24, 26, 26, 26, 36, 36,
138  36, 36, 36, 36, 38, 36, 36, 38,
139  38, 38, 38, 38, 38, 84, 76, 80,
140  80, 80, 76, 84, 88, 86, 82, 82,
141  82, 82, 86, 88, 182, 182, 168, 168,
142  168, 182, 182, 192, 186, 192, 172, 186,
143  192, 394, 382, 354, 382, 394, 406, 394,
144  394, 406, 418, 438, 418, 464, 464, 492,
145 };
146 
147 #define TEX_VLC_BITS 10
148 
149 /* XXX: also include quantization */
150 static RL_VLC_ELEM dv_rl_vlc[1664];
151 
152 static av_cold void dv_init_static(void)
153 {
154  VLCElem vlc_buf[FF_ARRAY_ELEMS(dv_rl_vlc)] = { 0 };
155  VLC dv_vlc = { .table = vlc_buf, .table_allocated = FF_ARRAY_ELEMS(vlc_buf) };
158  int i, j;
159 
160  /* it's faster to include sign bit in a generic VLC parsing scheme */
161  for (i = 0, j = 0; i < NB_DV_VLC; i++, j++) {
162  tmp[j].len = ff_dv_vlc_len[i];
163  tmp[j].run = ff_dv_vlc_run[i];
164  tmp[j].level = ff_dv_vlc_level[i];
165 
166  if (ff_dv_vlc_level[i]) {
167  tmp[j].len++;
168 
169  j++;
170  tmp[j].len = ff_dv_vlc_len[i] + 1;
171  tmp[j].run = ff_dv_vlc_run[i];
172  tmp[j].level = -ff_dv_vlc_level[i];
173  }
174  }
175 
176  /* NOTE: as a trick, we use the fact the no codes are unused
177  * to accelerate the parsing of partial codes */
179  &tmp[0].len, sizeof(tmp[0]),
180  NULL, 0, 0, 0, VLC_INIT_USE_STATIC, NULL);
181  av_assert1(dv_vlc.table_size == 1664);
182 
183  for (int i = 0; i < dv_vlc.table_size; i++) {
184  int code = dv_vlc.table[i].sym;
185  int len = dv_vlc.table[i].len;
186  int level, run;
187 
188  if (len < 0) { // more bits needed
189  run = 0;
190  level = code;
191  } else {
192  av_assert1(i <= code + offset);
193  run = tmp[code].run + 1;
194  level = tmp[code].level;
195  }
196  dv_rl_vlc[i].len = len;
197  dv_rl_vlc[i].level = level;
198  dv_rl_vlc[i].run = run;
199  }
200 }
201 
203 {
204  int j, i, c, s;
205  uint32_t *factor1 = &ctx->idct_factor[0],
206  *factor2 = &ctx->idct_factor[DV_PROFILE_IS_HD(d) ? 4096 : 2816];
207 
208  if (DV_PROFILE_IS_HD(d)) {
209  /* quantization quanta by QNO for DV100 */
210  static const uint8_t dv100_qstep[16] = {
211  1, /* QNO = 0 and 1 both have no quantization */
212  1,
213  2, 3, 4, 5, 6, 7, 8, 16, 18, 20, 22, 24, 28, 52
214  };
215  const uint16_t *iweight1, *iweight2;
216 
217  if (d->height == 720) {
218  iweight1 = &dv_iweight_720_y[0];
219  iweight2 = &dv_iweight_720_c[0];
220  } else {
221  iweight1 = &dv_iweight_1080_y[0];
222  iweight2 = &dv_iweight_1080_c[0];
223  }
224  for (c = 0; c < 4; c++) {
225  for (s = 0; s < 16; s++) {
226  for (i = 0; i < 64; i++) {
227  *factor1++ = (dv100_qstep[s] << (c + 9)) * iweight1[i];
228  *factor2++ = (dv100_qstep[s] << (c + 9)) * iweight2[i];
229  }
230  }
231  }
232  } else {
233  static const uint8_t dv_quant_areas[4] = { 6, 21, 43, 64 };
234  const uint16_t *iweight1 = &dv_iweight_88[0];
235  for (j = 0; j < 2; j++, iweight1 = &dv_iweight_248[0]) {
236  for (s = 0; s < 22; s++) {
237  for (i = c = 0; c < 4; c++) {
238  for (; i < dv_quant_areas[c]; i++) {
239  *factor1 = iweight1[i] << (ff_dv_quant_shifts[s][c] + 1);
240  *factor2++ = (*factor1++) << 1;
241  }
242  }
243  }
244  }
245  }
246 }
247 
249 {
250  static AVOnce init_static_once = AV_ONCE_INIT;
251  DVDecContext *s = avctx->priv_data;
252  int i;
253 
255 
256  ff_idctdsp_init(&s->idsp, avctx);
257 
258  for (i = 0; i < 64; i++)
259  s->dv_zigzag[0][i] = s->idsp.idct_permutation[ff_zigzag_direct[i]];
260 
261  if (avctx->lowres){
262  for (i = 0; i < 64; i++){
263  int j = ff_dv_zigzag248_direct[i];
264  s->dv_zigzag[1][i] = s->idsp.idct_permutation[(j & 7) + (j & 8) * 4 + (j & 48) / 2];
265  }
266  }else
267  memcpy(s->dv_zigzag[1], ff_dv_zigzag248_direct, sizeof(s->dv_zigzag[1]));
268 
269  s->idct_put[0] = s->idsp.idct_put;
270  s->idct_put[1] = ff_simple_idct248_put;
271 
272  ff_thread_once(&init_static_once, dv_init_static);
273 
274  return 0;
275 }
276 
277 /* decode AC coefficients */
278 static void dv_decode_ac(GetBitContext *gb, BlockInfo *mb, int16_t *block)
279 {
280  int last_index = gb->size_in_bits;
281  const uint8_t *scan_table = mb->scan_table;
282  const uint32_t *factor_table = mb->factor_table;
283  int pos = mb->pos;
284  int partial_bit_count = mb->partial_bit_count;
285  int level, run, vlc_len, index;
286 
287  OPEN_READER_NOSIZE(re, gb);
288  UPDATE_CACHE(re, gb);
289 
290  /* if we must parse a partial VLC, we do it here */
291  if (partial_bit_count > 0) {
292  re_cache = re_cache >> partial_bit_count |
293  mb->partial_bit_buffer;
294  re_index -= partial_bit_count;
295  mb->partial_bit_count = 0;
296  }
297 
298  /* get the AC coefficients until last_index is reached */
299  for (;;) {
300  ff_dlog(NULL, "%2d: bits=%04"PRIx32" index=%u\n",
301  pos, SHOW_UBITS(re, gb, 16), re_index);
302  /* our own optimized GET_RL_VLC */
303  index = NEG_USR32(re_cache, TEX_VLC_BITS);
304  vlc_len = dv_rl_vlc[index].len;
305  if (vlc_len < 0) {
306  index = NEG_USR32((unsigned) re_cache << TEX_VLC_BITS, -vlc_len) +
308  vlc_len = TEX_VLC_BITS - vlc_len;
309  }
311  run = dv_rl_vlc[index].run;
312 
313  /* gotta check if we're still within gb boundaries */
314  if (re_index + vlc_len > last_index) {
315  /* should be < 16 bits otherwise a codeword could have been parsed */
316  mb->partial_bit_count = last_index - re_index;
317  mb->partial_bit_buffer = re_cache & ~(-1u >> mb->partial_bit_count);
318  re_index = last_index;
319  break;
320  }
321  re_index += vlc_len;
322 
323  ff_dlog(NULL, "run=%d level=%d\n", run, level);
324  pos += run;
325  if (pos >= 64)
326  break;
327 
328  level = (level * factor_table[pos] + (1 << (dv_iweight_bits - 1))) >>
330  block[scan_table[pos]] = level;
331 
332  UPDATE_CACHE(re, gb);
333  }
334  CLOSE_READER(re, gb);
335  mb->pos = pos;
336 }
337 
338 static inline void bit_copy(PutBitContext *pb, GetBitContext *gb)
339 {
340  int bits_left = get_bits_left(gb);
341  while (bits_left >= MIN_CACHE_BITS) {
344  }
345  if (bits_left > 0)
347 }
348 
349 static av_always_inline void put_block_8x4(int16_t *block, uint8_t *restrict p, int stride)
350 {
351  int i, j;
352 
353  for (i = 0; i < 4; i++) {
354  for (j = 0; j < 8; j++)
355  p[j] = av_clip_uint8(block[j]);
356  block += 8;
357  p += stride;
358  }
359 }
360 
362  int stride, int16_t *blocks)
363 {
364  s->idsp.idct(blocks + 0*64);
365  s->idsp.idct(blocks + 1*64);
366 
367  put_block_8x4(blocks+0*64, data, stride<<1);
368  put_block_8x4(blocks+0*64 + 4*8, data + 8, stride<<1);
369  put_block_8x4(blocks+1*64, data + stride, stride<<1);
370  put_block_8x4(blocks+1*64 + 4*8, data + 8 + stride, stride<<1);
371 }
372 
374  int stride, int16_t *blocks)
375 {
376  s->idsp.idct(blocks + 0*64);
377  s->idsp.idct(blocks + 1*64);
378  s->idsp.idct(blocks + 2*64);
379  s->idsp.idct(blocks + 3*64);
380 
381  put_block_8x4(blocks+0*64, data, stride<<1);
382  put_block_8x4(blocks+0*64 + 4*8, data + 16, stride<<1);
383  put_block_8x4(blocks+1*64, data + 8, stride<<1);
384  put_block_8x4(blocks+1*64 + 4*8, data + 24, stride<<1);
385  put_block_8x4(blocks+2*64, data + stride, stride<<1);
386  put_block_8x4(blocks+2*64 + 4*8, data + 16 + stride, stride<<1);
387  put_block_8x4(blocks+3*64, data + 8 + stride, stride<<1);
388  put_block_8x4(blocks+3*64 + 4*8, data + 24 + stride, stride<<1);
389 }
390 
391 /* mb_x and mb_y are in units of 8 pixels */
392 static int dv_decode_video_segment(AVCodecContext *avctx, void *arg)
393 {
394  const DVDecContext *s = avctx->priv_data;
395  DVwork_chunk *work_chunk = arg;
396  int quant, dc, dct_mode, class1, j;
397  int mb_index, mb_x, mb_y, last_index;
398  int y_stride, linesize;
399  int16_t *block, *block1;
400  int c_offset;
401  uint8_t *y_ptr;
402  const uint8_t *buf_ptr;
403  PutBitContext pb, vs_pb;
404  GetBitContext gb;
405  BlockInfo mb_data[5 * DV_MAX_BPM], *mb, *mb1;
406  LOCAL_ALIGNED_16(int16_t, sblock, [5 * DV_MAX_BPM], [64]);
407  LOCAL_ALIGNED_16(uint8_t, mb_bit_buffer, [80 + AV_INPUT_BUFFER_PADDING_SIZE]); /* allow some slack */
408  LOCAL_ALIGNED_16(uint8_t, vs_bit_buffer, [80 * 5 + AV_INPUT_BUFFER_PADDING_SIZE]); /* allow some slack */
409  const int log2_blocksize = 3 - avctx->lowres;
410  int is_field_mode[5];
411  int vs_bit_buffer_damaged = 0;
412  int mb_bit_buffer_damaged[5] = {0};
413  int retried = 0;
414  int sta;
415 
416  av_assert1((((uintptr_t) mb_bit_buffer) & 7) == 0);
417  av_assert1((((uintptr_t) vs_bit_buffer) & 7) == 0);
418 
419 retry:
420 
421  memset(sblock, 0, 5 * DV_MAX_BPM * sizeof(*sblock));
422 
423  /* pass 1: read DC and AC coefficients in blocks */
424  buf_ptr = &s->buf[work_chunk->buf_offset * 80];
425  block1 = &sblock[0][0];
426  mb1 = mb_data;
427  init_put_bits(&vs_pb, vs_bit_buffer, 5 * 80);
428  for (mb_index = 0; mb_index < 5; mb_index++, mb1 += s->sys->bpm, block1 += s->sys->bpm * 64) {
429  /* skip header */
430  quant = buf_ptr[3] & 0x0f;
431  if (avctx->error_concealment) {
432  if ((buf_ptr[3] >> 4) == 0x0E)
433  vs_bit_buffer_damaged = 1;
434  if (!mb_index) {
435  sta = buf_ptr[3] >> 4;
436  } else if (sta != (buf_ptr[3] >> 4))
437  vs_bit_buffer_damaged = 1;
438  }
439  buf_ptr += 4;
440  init_put_bits(&pb, mb_bit_buffer, 80);
441  mb = mb1;
442  block = block1;
443  is_field_mode[mb_index] = 0;
444  for (j = 0; j < s->sys->bpm; j++) {
445  last_index = s->sys->block_sizes[j];
446  init_get_bits(&gb, buf_ptr, last_index);
447 
448  /* get the DC */
449  dc = get_sbits(&gb, 9);
450  dct_mode = get_bits1(&gb);
451  class1 = get_bits(&gb, 2);
452  if (DV_PROFILE_IS_HD(s->sys)) {
453  mb->idct_put = s->idct_put[0];
454  mb->scan_table = s->dv_zigzag[0];
455  mb->factor_table = &s->idct_factor[(j >= 4) * 4 * 16 * 64 +
456  class1 * 16 * 64 +
457  quant * 64];
458  is_field_mode[mb_index] |= !j && dct_mode;
459  } else {
460  mb->idct_put = s->idct_put[dct_mode && log2_blocksize == 3];
461  mb->scan_table = s->dv_zigzag[dct_mode];
462  mb->factor_table =
463  &s->idct_factor[(class1 == 3) * 2 * 22 * 64 +
464  dct_mode * 22 * 64 +
465  (quant + ff_dv_quant_offset[class1]) * 64];
466  }
467  dc = dc * 4;
468  /* convert to unsigned because 128 is not added in the
469  * standard IDCT */
470  dc += 1024;
471  block[0] = dc;
472  buf_ptr += last_index >> 3;
473  mb->pos = 0;
474  mb->partial_bit_count = 0;
475 
476  ff_dlog(avctx, "MB block: %d, %d ", mb_index, j);
477  dv_decode_ac(&gb, mb, block);
478 
479  /* write the remaining bits in a new buffer only if the
480  * block is finished */
481  if (mb->pos >= 64)
482  bit_copy(&pb, &gb);
483  if (mb->pos >= 64 && mb->pos < 127)
484  vs_bit_buffer_damaged = mb_bit_buffer_damaged[mb_index] = 1;
485 
486  block += 64;
487  mb++;
488  }
489 
490  if (mb_bit_buffer_damaged[mb_index] > 0)
491  continue;
492 
493  /* pass 2: we can do it just after */
494  ff_dlog(avctx, "***pass 2 size=%d MB#=%d\n", put_bits_count(&pb), mb_index);
495  block = block1;
496  mb = mb1;
497  init_get_bits(&gb, mb_bit_buffer, put_bits_count(&pb));
498  put_bits32(&pb, 0); // padding must be zeroed
499  flush_put_bits(&pb);
500  for (j = 0; j < s->sys->bpm; j++, block += 64, mb++) {
501  if (mb->pos < 64 && get_bits_left(&gb) > 0) {
502  dv_decode_ac(&gb, mb, block);
503  /* if still not finished, no need to parse other blocks */
504  if (mb->pos < 64)
505  break;
506  if (mb->pos < 127)
507  vs_bit_buffer_damaged = mb_bit_buffer_damaged[mb_index] = 1;
508  }
509  }
510  /* all blocks are finished, so the extra bytes can be used at
511  * the video segment level */
512  if (j >= s->sys->bpm)
513  bit_copy(&vs_pb, &gb);
514  }
515 
516  /* we need a pass over the whole video segment */
517  ff_dlog(avctx, "***pass 3 size=%d\n", put_bits_count(&vs_pb));
518  block = &sblock[0][0];
519  mb = mb_data;
520  init_get_bits(&gb, vs_bit_buffer, put_bits_count(&vs_pb));
521  put_bits32(&vs_pb, 0); // padding must be zeroed
522  flush_put_bits(&vs_pb);
523  for (mb_index = 0; mb_index < 5; mb_index++) {
524  for (j = 0; j < s->sys->bpm; j++) {
525  if (mb->pos < 64 && get_bits_left(&gb) > 0 && !vs_bit_buffer_damaged) {
526  ff_dlog(avctx, "start %d:%d\n", mb_index, j);
527  dv_decode_ac(&gb, mb, block);
528  }
529 
530  if (mb->pos >= 64 && mb->pos < 127) {
531  av_log(avctx, AV_LOG_ERROR,
532  "AC EOB marker is absent pos=%d\n", mb->pos);
533  vs_bit_buffer_damaged = 1;
534  }
535  block += 64;
536  mb++;
537  }
538  }
539  if (vs_bit_buffer_damaged && !retried) {
540  av_log(avctx, AV_LOG_ERROR, "Concealing bitstream errors\n");
541  retried = 1;
542  goto retry;
543  }
544 
545  /* compute idct and place blocks */
546  block = &sblock[0][0];
547  mb = mb_data;
548  for (mb_index = 0; mb_index < 5; mb_index++) {
549  dv_calculate_mb_xy(s->sys, s->buf, work_chunk, mb_index, &mb_x, &mb_y);
550 
551  /* idct_put'ting luminance */
552  if ((s->sys->pix_fmt == AV_PIX_FMT_YUV420P) ||
553  (s->sys->pix_fmt == AV_PIX_FMT_YUV411P && mb_x >= (704 / 8)) ||
554  (s->sys->height >= 720 && mb_y != 134)) {
555  y_stride = (s->frame->linesize[0] <<
556  ((!is_field_mode[mb_index]) * log2_blocksize));
557  } else {
558  y_stride = (2 << log2_blocksize);
559  }
560  y_ptr = s->frame->data[0] +
561  ((mb_y * s->frame->linesize[0] + mb_x) << log2_blocksize);
562  if (mb_y == 134 && is_field_mode[mb_index]) {
563  dv100_idct_put_last_row_field_luma(s, y_ptr, s->frame->linesize[0], block);
564  } else {
565  linesize = s->frame->linesize[0] << is_field_mode[mb_index];
566  mb[0].idct_put(y_ptr, linesize, block + 0 * 64);
567  if (s->sys->video_stype == 4) { /* SD 422 */
568  mb[2].idct_put(y_ptr + (1 << log2_blocksize), linesize, block + 2 * 64);
569  } else {
570  mb[1].idct_put(y_ptr + (1 << log2_blocksize), linesize, block + 1 * 64);
571  mb[2].idct_put(y_ptr + y_stride, linesize, block + 2 * 64);
572  mb[3].idct_put(y_ptr + (1 << log2_blocksize) + y_stride, linesize, block + 3 * 64);
573  }
574  }
575  mb += 4;
576  block += 4 * 64;
577 
578  /* idct_put'ting chrominance */
579  c_offset = (((mb_y >> (s->sys->pix_fmt == AV_PIX_FMT_YUV420P)) * s->frame->linesize[1] +
580  (mb_x >> ((s->sys->pix_fmt == AV_PIX_FMT_YUV411P) ? 2 : 1))) << log2_blocksize);
581  for (j = 2; j; j--) {
582  uint8_t *c_ptr = s->frame->data[j] + c_offset;
583  if (s->sys->pix_fmt == AV_PIX_FMT_YUV411P && mb_x >= (704 / 8)) {
584  uint64_t aligned_pixels[64 / 8];
585  uint8_t *pixels = (uint8_t *) aligned_pixels;
586  uint8_t *c_ptr1, *ptr1;
587  int x, y;
588  mb->idct_put(pixels, 8, block);
589  for (y = 0; y < (1 << log2_blocksize); y++, c_ptr += s->frame->linesize[j], pixels += 8) {
590  ptr1 = pixels + ((1 << (log2_blocksize))>>1);
591  c_ptr1 = c_ptr + (s->frame->linesize[j] << log2_blocksize);
592  for (x = 0; x < (1 << FFMAX(log2_blocksize - 1, 0)); x++) {
593  c_ptr[x] = pixels[x];
594  c_ptr1[x] = ptr1[x];
595  }
596  }
597  block += 64;
598  mb++;
599  } else {
600  y_stride = (mb_y == 134) ? (1 << log2_blocksize) :
601  s->frame->linesize[j] << ((!is_field_mode[mb_index]) * log2_blocksize);
602  if (mb_y == 134 && is_field_mode[mb_index]) {
603  dv100_idct_put_last_row_field_chroma(s, c_ptr, s->frame->linesize[j], block);
604  mb += 2;
605  block += 2*64;
606  } else {
607  linesize = s->frame->linesize[j] << is_field_mode[mb_index];
608  (mb++)->idct_put(c_ptr, linesize, block);
609  block += 64;
610  if (s->sys->bpm == 8) {
611  (mb++)->idct_put(c_ptr + y_stride, linesize, block);
612  block += 64;
613  }
614  }
615  }
616  }
617  }
618  return 0;
619 }
620 
621 /* NOTE: exactly one frame must be given (120000 bytes for NTSC,
622  * 144000 bytes for PAL - or twice those for 50Mbps) */
624  int *got_frame, AVPacket *avpkt)
625 {
626  uint8_t *buf = avpkt->data;
627  int buf_size = avpkt->size;
628  DVDecContext *s = avctx->priv_data;
629  const uint8_t *vsc_pack;
630  int apt, is16_9, ret;
631  const AVDVProfile *sys;
632 
633  sys = ff_dv_frame_profile(avctx, s->sys, buf, buf_size);
634  if (!sys || buf_size < sys->frame_size) {
635  av_log(avctx, AV_LOG_ERROR, "could not find dv frame profile\n");
636  return -1; /* NOTE: we only accept several full frames */
637  }
638 
639  if (sys != s->sys) {
640  ff_dv_init_dynamic_tables(s->work_chunks, sys);
641  dv_init_weight_tables(s, sys);
642  s->sys = sys;
643  }
644 
645  s->frame = frame;
646  avctx->pix_fmt = s->sys->pix_fmt;
647  avctx->framerate = av_inv_q(s->sys->time_base);
648  avctx->bit_rate = av_rescale_q(s->sys->frame_size,
649  (AVRational) { 8, 1 },
650  s->sys->time_base);
651 
652  ret = ff_set_dimensions(avctx, s->sys->width, s->sys->height);
653  if (ret < 0)
654  return ret;
655 
656  /* Determine the codec's sample_aspect ratio from the packet */
657  vsc_pack = buf + 80 * 5 + 48 + 5;
658  if (*vsc_pack == DV_VIDEO_CONTROL) {
659  apt = buf[4] & 0x07;
660  is16_9 = (vsc_pack[2] & 0x07) == 0x02 ||
661  (!apt && (vsc_pack[2] & 0x07) == 0x07);
662  ff_set_sar(avctx, s->sys->sar[is16_9]);
663  }
664 
665  if ((ret = ff_thread_get_buffer(avctx, frame, 0)) < 0)
666  return ret;
667 
668  /* Determine the codec's field order from the packet */
669  if ( *vsc_pack == DV_VIDEO_CONTROL ) {
670  if (avctx->height == 720) {
671  frame->flags &= ~AV_FRAME_FLAG_INTERLACED;
673  } else if (avctx->height == 1080) {
675  frame->flags |= AV_FRAME_FLAG_TOP_FIELD_FIRST * ((vsc_pack[3] & 0x40) == 0x40);
676  } else {
677  frame->flags |= AV_FRAME_FLAG_INTERLACED * ((vsc_pack[3] & 0x10) == 0x10);
678  frame->flags |= AV_FRAME_FLAG_TOP_FIELD_FIRST * !(vsc_pack[3] & 0x40);
679  }
680  }
681 
682  s->buf = buf;
683  avctx->execute(avctx, dv_decode_video_segment, s->work_chunks, NULL,
684  dv_work_pool_size(s->sys), sizeof(DVwork_chunk));
685 
686  emms_c();
687 
688  /* return image */
689  *got_frame = 1;
690 
691  return s->sys->frame_size;
692 }
693 
695  .p.name = "dvvideo",
696  CODEC_LONG_NAME("DV (Digital Video)"),
697  .p.type = AVMEDIA_TYPE_VIDEO,
698  .p.id = AV_CODEC_ID_DVVIDEO,
699  .priv_data_size = sizeof(DVDecContext),
703  .p.max_lowres = 3,
704 };
ff_vlc_init_from_lengths
int ff_vlc_init_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:306
level
uint8_t level
Definition: svq3.c:205
DVDecContext::dv_zigzag
uint8_t dv_zigzag[2][64]
Definition: dvdec.c:72
DV_MAX_BPM
#define DV_MAX_BPM
maximum number of blocks per macroblock in any DV format
Definition: dv.h:72
get_bits_left
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:695
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:202
DVDecContext
Definition: dvdec.c:67
dv_profile_internal.h
u
#define u(width, name, range_min, range_max)
Definition: cbs_h2645.c:251
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:60
GetBitContext::size_in_bits
int size_in_bits
Definition: get_bits.h:111
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:373
DVDecContext::frame
const AVFrame * frame
Definition: dvdec.c:69
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:374
put_bits
static void put_bits(Jpeg2000EncoderContext *s, int val, int n)
put n times val bit
Definition: j2kenc.c:223
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:338
AVPacket::data
uint8_t * data
Definition: packet.h:524
RL_VLC_ELEM::run
uint8_t run
Definition: vlc.h:59
data
const char data[16]
Definition: mxf.c:148
FFCodec
Definition: codec_internal.h:126
VLCElem::len
VLCBaseType len
Definition: vlc.h:33
UPDATE_CACHE
#define UPDATE_CACHE(name, gb)
Definition: get_bits.h:225
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:94
init_get_bits
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:514
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:172
AV_FRAME_FLAG_TOP_FIELD_FIRST
#define AV_FRAME_FLAG_TOP_FIELD_FIRST
A flag to mark frames where the top field is displayed first if the content is interlaced.
Definition: frame.h:638
AVCodecContext::framerate
AVRational framerate
Definition: avcodec.h:560
get_bits
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:335
FFCodec::p
AVCodec p
The public AVCodec.
Definition: codec_internal.h:130
GetBitContext
Definition: get_bits.h:108
DV_VIDEO_CONTROL
@ DV_VIDEO_CONTROL
Definition: dv.h:47
VLCElem::sym
VLCBaseType sym
Definition: vlc.h:33
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:126
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:361
DVDecContext::sys
const AVDVProfile * sys
Definition: dvdec.c:68
BlockInfo::partial_bit_buffer
uint32_t partial_bit_buffer
Definition: dvdec.c:63
dv_iweight_88
static const uint16_t dv_iweight_88[64]
Definition: dvdec.c:82
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:106
quant
static const uint8_t quant[64]
Definition: vmixdec.c:71
avassert.h
ff_thread_once
static int ff_thread_once(char *control, void(*routine)(void))
Definition: thread.h:205
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:392
dvvideo_decode_init
static av_cold int dvvideo_decode_init(AVCodecContext *avctx)
Definition: dvdec.c:248
emms_c
#define emms_c()
Definition: emms.h:63
CLOSE_READER
#define CLOSE_READER(name, gb)
Definition: get_bits.h:188
FF_CODEC_DECODE_CB
#define FF_CODEC_DECODE_CB(func)
Definition: codec_internal.h:286
s
#define s(width, name)
Definition: cbs_vp9.c:198
dv_decode_ac
static void dv_decode_ac(GetBitContext *gb, BlockInfo *mb, int16_t *block)
Definition: dvdec.c:278
frame_size
int frame_size
Definition: mxfenc.c:2423
ff_thread_get_buffer
int ff_thread_get_buffer(AVCodecContext *avctx, AVFrame *f, int flags)
Wrapper around get_buffer() for frame-multithreaded codecs.
Definition: pthread_frame.c:986
AVCodecContext::error_concealment
int error_concealment
error concealment flags
Definition: avcodec.h:1386
LOCAL_ALIGNED_16
#define LOCAL_ALIGNED_16(t, v,...)
Definition: mem_internal.h:150
BlockInfo::factor_table
const uint32_t * factor_table
Definition: dvdec.c:58
get_sbits
static int get_sbits(GetBitContext *s, int n)
Definition: get_bits.h:320
ctx
AVFormatContext * ctx
Definition: movenc.c:49
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
av_rescale_q
int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq)
Rescale a 64-bit integer by 2 rational numbers.
Definition: mathematics.c:142
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:73
PutBitContext
Definition: put_bits.h:50
CODEC_LONG_NAME
#define CODEC_LONG_NAME(str)
Definition: codec_internal.h:271
arg
const char * arg
Definition: jacosubdec.c:67
dv_iweight_720_c
static const uint16_t dv_iweight_720_c[64]
Definition: dvdec.c:136
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:110
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:203
dvvideo_decode_frame
static int dvvideo_decode_frame(AVCodecContext *avctx, AVFrame *frame, int *got_frame, AVPacket *avpkt)
Definition: dvdec.c:623
NULL
#define NULL
Definition: coverity.c:32
bits_left
#define bits_left
Definition: bitstream.h:114
run
uint8_t run
Definition: svq3.c:204
idct_put
static void idct_put(FourXContext *f, int x, int y)
Definition: 4xm.c:558
AVRational
Rational number (pair of numerator and denominator).
Definition: rational.h:58
AVCHROMA_LOC_TOPLEFT
@ AVCHROMA_LOC_TOPLEFT
ITU-R 601, SMPTE 274M 296M S314M(DV 4:1:1), mpeg2 4:2:2.
Definition: pixfmt.h:709
BlockInfo::idct_put
void(* idct_put)(uint8_t *dest, ptrdiff_t stride, int16_t *block)
Definition: dvdec.c:61
AVCodecContext::bit_rate
int64_t bit_rate
the average bitrate
Definition: avcodec.h:495
get_bits1
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:388
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:109
DVDecContext::idct_put
void(* idct_put[2])(uint8_t *dest, ptrdiff_t stride, int16_t *block)
Definition: dvdec.c:75
AVOnce
#define AVOnce
Definition: thread.h:202
index
int index
Definition: gxfenc.c:90
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:57
RL_VLC_ELEM::len
int8_t len
Definition: vlc.h:58
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:1855
init
int(* init)(AVBSFContext *ctx)
Definition: dts2pts.c:366
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:525
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:56
codec_internal.h
VLCElem
Definition: vlc.h:32
dv_rl_vlc
static RL_VLC_ELEM dv_rl_vlc[1664]
Definition: dvdec.c:150
ff_dv_zigzag248_direct
const uint8_t ff_dv_zigzag248_direct[64]
Definition: dvdata.c:33
block1
static int16_t block1[64]
Definition: dct.c:120
AV_CODEC_CAP_SLICE_THREADS
#define AV_CODEC_CAP_SLICE_THREADS
Codec supports slice-based (or partition-based) multithreading.
Definition: codec.h:114
DVDecContext::idct_factor
uint32_t idct_factor[2 *4 *16 *64]
Definition: dvdec.c:74
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:64
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:152
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:99
DVDecContext::work_chunks
DVwork_chunk work_chunks[4 *12 *27]
Definition: dvdec.c:73
emms.h
NEG_USR32
#define NEG_USR32(a, s)
Definition: mathops.h:178
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:256
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:92
internal.h
av_assert1
#define av_assert1(cond)
assert() equivalent, that does not lie in speed critical code.
Definition: avassert.h:56
MIN_CACHE_BITS
#define MIN_CACHE_BITS
Definition: get_bits.h:169
av_always_inline
#define av_always_inline
Definition: attributes.h:49
AV_CODEC_ID_DVVIDEO
@ AV_CODEC_ID_DVVIDEO
Definition: codec_id.h:76
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:194
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:702
BlockInfo::scan_table
const uint8_t * scan_table
Definition: dvdec.c:59
len
int len
Definition: vorbis_enc_data.h:426
DVDecContext::idsp
IDCTDSPContext idsp
Definition: dvdec.c:77
AVCodecContext::height
int height
Definition: avcodec.h:618
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:657
AV_FRAME_FLAG_INTERLACED
#define AV_FRAME_FLAG_INTERLACED
A flag to mark frames whose content is interlaced.
Definition: frame.h:633
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:147
pos
unsigned int pos
Definition: spdifenc.c:414
IDCTDSPContext
Definition: idctdsp.h:43
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:445
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:1613
SHOW_UBITS
#define SHOW_UBITS(name, gb, num)
Definition: get_bits.h:259
VLC
Definition: vlc.h:36
AVDVProfile
Definition: dv_profile.h:38
VLC::table
VLCElem * table
Definition: vlc.h:38
av_clip_uint8
#define av_clip_uint8
Definition: common.h:105
VLC::table_size
int table_size
Definition: vlc.h:39
ff_dv_init_dynamic_tables
void ff_dv_init_dynamic_tables(DVwork_chunk *work_chunks, const AVDVProfile *d)
Definition: dv.c:169
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
put_block_8x4
static av_always_inline void put_block_8x4(int16_t *block, uint8_t *restrict p, int stride)
Definition: dvdec.c:349
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:116
AVPacket
This structure stores compressed data.
Definition: packet.h:501
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:472
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:80
d
d
Definition: ffmpeg_filter.c:424
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
VLC_INIT_USE_STATIC
#define VLC_INIT_USE_STATIC
Definition: vlc.h:182
put_bits.h
dv_iweight_bits
static const int dv_iweight_bits
Definition: dvdec.c:80
RL_VLC_ELEM::level
int16_t level
Definition: vlc.h:57
dvdata.h
BlockInfo::partial_bit_count
uint8_t partial_bit_count
Definition: dvdec.c:62
ff_dvvideo_decoder
const FFCodec ff_dvvideo_decoder
Definition: dvdec.c:694
DVDecContext::buf
const uint8_t * buf
Definition: dvdec.c:70