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/imgutils.h"
40 #include "libavutil/internal.h"
41 #include "libavutil/mem_internal.h"
42 #include "libavutil/pixdesc.h"
43 #include "libavutil/thread.h"
44 
45 #include "avcodec.h"
46 #include "codec_internal.h"
47 #include "dv.h"
48 #include "dv_profile_internal.h"
49 #include "dvdata.h"
50 #include "get_bits.h"
51 #include "internal.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 static const int dv_iweight_bits = 14;
67 
68 static const uint16_t dv_iweight_88[64] = {
69  32768, 16705, 16705, 17734, 17032, 17734, 18205, 18081,
70  18081, 18205, 18725, 18562, 19195, 18562, 18725, 19266,
71  19091, 19705, 19705, 19091, 19266, 21407, 19643, 20267,
72  20228, 20267, 19643, 21407, 22725, 21826, 20853, 20806,
73  20806, 20853, 21826, 22725, 23170, 23170, 21407, 21400,
74  21407, 23170, 23170, 24598, 23786, 22018, 22018, 23786,
75  24598, 25251, 24465, 22654, 24465, 25251, 25972, 25172,
76  25172, 25972, 26722, 27969, 26722, 29692, 29692, 31521,
77 };
78 static const uint16_t dv_iweight_248[64] = {
79  32768, 16384, 16705, 16705, 17734, 17734, 17734, 17734,
80  18081, 18081, 18725, 18725, 21407, 21407, 19091, 19091,
81  19195, 19195, 18205, 18205, 18725, 18725, 19705, 19705,
82  20267, 20267, 21826, 21826, 23170, 23170, 20806, 20806,
83  20267, 20267, 19266, 19266, 21407, 21407, 20853, 20853,
84  21400, 21400, 23786, 23786, 24465, 24465, 22018, 22018,
85  23170, 23170, 22725, 22725, 24598, 24598, 24465, 24465,
86  25172, 25172, 27969, 27969, 25972, 25972, 29692, 29692
87 };
88 
89 /**
90  * The "inverse" DV100 weights are actually just the spec weights (zig-zagged).
91  */
92 static const uint16_t dv_iweight_1080_y[64] = {
93  128, 16, 16, 17, 17, 17, 18, 18,
94  18, 18, 18, 18, 19, 18, 18, 19,
95  19, 19, 19, 19, 19, 42, 38, 40,
96  40, 40, 38, 42, 44, 43, 41, 41,
97  41, 41, 43, 44, 45, 45, 42, 42,
98  42, 45, 45, 48, 46, 43, 43, 46,
99  48, 49, 48, 44, 48, 49, 101, 98,
100  98, 101, 104, 109, 104, 116, 116, 123,
101 };
102 static const uint16_t dv_iweight_1080_c[64] = {
103  128, 16, 16, 17, 17, 17, 25, 25,
104  25, 25, 26, 25, 26, 25, 26, 26,
105  26, 27, 27, 26, 26, 42, 38, 40,
106  40, 40, 38, 42, 44, 43, 41, 41,
107  41, 41, 43, 44, 91, 91, 84, 84,
108  84, 91, 91, 96, 93, 86, 86, 93,
109  96, 197, 191, 177, 191, 197, 203, 197,
110  197, 203, 209, 219, 209, 232, 232, 246,
111 };
112 static const uint16_t dv_iweight_720_y[64] = {
113  128, 16, 16, 17, 17, 17, 18, 18,
114  18, 18, 18, 18, 19, 18, 18, 19,
115  19, 19, 19, 19, 19, 42, 38, 40,
116  40, 40, 38, 42, 44, 43, 41, 41,
117  41, 41, 43, 44, 68, 68, 63, 63,
118  63, 68, 68, 96, 92, 86, 86, 92,
119  96, 98, 96, 88, 96, 98, 202, 196,
120  196, 202, 208, 218, 208, 232, 232, 246,
121 };
122 static const uint16_t dv_iweight_720_c[64] = {
123  128, 24, 24, 26, 26, 26, 36, 36,
124  36, 36, 36, 36, 38, 36, 36, 38,
125  38, 38, 38, 38, 38, 84, 76, 80,
126  80, 80, 76, 84, 88, 86, 82, 82,
127  82, 82, 86, 88, 182, 182, 168, 168,
128  168, 182, 182, 192, 186, 192, 172, 186,
129  192, 394, 382, 354, 382, 394, 406, 394,
130  394, 406, 418, 438, 418, 464, 464, 492,
131 };
132 
133 #define TEX_VLC_BITS 10
134 
135 /* XXX: also include quantization */
136 static RL_VLC_ELEM dv_rl_vlc[1664];
137 
138 static void dv_init_static(void)
139 {
141  VLC dv_vlc = { .table = vlc_buf, .table_allocated = FF_ARRAY_ELEMS(vlc_buf) };
142  uint16_t new_dv_vlc_bits[NB_DV_VLC * 2];
143  uint8_t new_dv_vlc_len[NB_DV_VLC * 2];
144  uint8_t new_dv_vlc_run[NB_DV_VLC * 2];
145  int16_t new_dv_vlc_level[NB_DV_VLC * 2];
146  int i, j;
147 
148  /* it's faster to include sign bit in a generic VLC parsing scheme */
149  for (i = 0, j = 0; i < NB_DV_VLC; i++, j++) {
150  new_dv_vlc_bits[j] = ff_dv_vlc_bits[i];
151  new_dv_vlc_len[j] = ff_dv_vlc_len[i];
152  new_dv_vlc_run[j] = ff_dv_vlc_run[i];
153  new_dv_vlc_level[j] = ff_dv_vlc_level[i];
154 
155  if (ff_dv_vlc_level[i]) {
156  new_dv_vlc_bits[j] <<= 1;
157  new_dv_vlc_len[j]++;
158 
159  j++;
160  new_dv_vlc_bits[j] = (ff_dv_vlc_bits[i] << 1) | 1;
161  new_dv_vlc_len[j] = ff_dv_vlc_len[i] + 1;
162  new_dv_vlc_run[j] = ff_dv_vlc_run[i];
163  new_dv_vlc_level[j] = -ff_dv_vlc_level[i];
164  }
165  }
166 
167  /* NOTE: as a trick, we use the fact the no codes are unused
168  * to accelerate the parsing of partial codes */
169  init_vlc(&dv_vlc, TEX_VLC_BITS, j, new_dv_vlc_len,
170  1, 1, new_dv_vlc_bits, 2, 2, INIT_VLC_USE_NEW_STATIC);
171  av_assert1(dv_vlc.table_size == 1664);
172 
173  for (int i = 0; i < dv_vlc.table_size; i++) {
174  int code = dv_vlc.table[i].sym;
175  int len = dv_vlc.table[i].len;
176  int level, run;
177 
178  if (len < 0) { // more bits needed
179  run = 0;
180  level = code;
181  } else {
182  run = new_dv_vlc_run[code] + 1;
183  level = new_dv_vlc_level[code];
184  }
185  dv_rl_vlc[i].len = len;
186  dv_rl_vlc[i].level = level;
187  dv_rl_vlc[i].run = run;
188  }
189 }
190 
192 {
193  int j, i, c, s;
194  uint32_t *factor1 = &ctx->idct_factor[0],
195  *factor2 = &ctx->idct_factor[DV_PROFILE_IS_HD(d) ? 4096 : 2816];
196 
197  if (DV_PROFILE_IS_HD(d)) {
198  /* quantization quanta by QNO for DV100 */
199  static const uint8_t dv100_qstep[16] = {
200  1, /* QNO = 0 and 1 both have no quantization */
201  1,
202  2, 3, 4, 5, 6, 7, 8, 16, 18, 20, 22, 24, 28, 52
203  };
204  const uint16_t *iweight1, *iweight2;
205 
206  if (d->height == 720) {
207  iweight1 = &dv_iweight_720_y[0];
208  iweight2 = &dv_iweight_720_c[0];
209  } else {
210  iweight1 = &dv_iweight_1080_y[0];
211  iweight2 = &dv_iweight_1080_c[0];
212  }
213  for (c = 0; c < 4; c++) {
214  for (s = 0; s < 16; s++) {
215  for (i = 0; i < 64; i++) {
216  *factor1++ = (dv100_qstep[s] << (c + 9)) * iweight1[i];
217  *factor2++ = (dv100_qstep[s] << (c + 9)) * iweight2[i];
218  }
219  }
220  }
221  } else {
222  static const uint8_t dv_quant_areas[4] = { 6, 21, 43, 64 };
223  const uint16_t *iweight1 = &dv_iweight_88[0];
224  for (j = 0; j < 2; j++, iweight1 = &dv_iweight_248[0]) {
225  for (s = 0; s < 22; s++) {
226  for (i = c = 0; c < 4; c++) {
227  for (; i < dv_quant_areas[c]; i++) {
228  *factor1 = iweight1[i] << (ff_dv_quant_shifts[s][c] + 1);
229  *factor2++ = (*factor1++) << 1;
230  }
231  }
232  }
233  }
234  }
235 }
236 
238 {
239  static AVOnce init_static_once = AV_ONCE_INIT;
240  DVVideoContext *s = avctx->priv_data;
241  int i;
242 
243  ff_idctdsp_init(&s->idsp, avctx);
244 
245  for (i = 0; i < 64; i++)
246  s->dv_zigzag[0][i] = s->idsp.idct_permutation[ff_zigzag_direct[i]];
247 
248  if (avctx->lowres){
249  for (i = 0; i < 64; i++){
250  int j = ff_dv_zigzag248_direct[i];
251  s->dv_zigzag[1][i] = s->idsp.idct_permutation[(j & 7) + (j & 8) * 4 + (j & 48) / 2];
252  }
253  }else
254  memcpy(s->dv_zigzag[1], ff_dv_zigzag248_direct, sizeof(s->dv_zigzag[1]));
255 
256  s->idct_put[0] = s->idsp.idct_put;
257  s->idct_put[1] = ff_simple_idct248_put;
258 
259  ff_thread_once(&init_static_once, dv_init_static);
260 
261  return ff_dvvideo_init(avctx);
262 }
263 
264 /* decode AC coefficients */
265 static void dv_decode_ac(GetBitContext *gb, BlockInfo *mb, int16_t *block)
266 {
267  int last_index = gb->size_in_bits;
268  const uint8_t *scan_table = mb->scan_table;
269  const uint32_t *factor_table = mb->factor_table;
270  int pos = mb->pos;
271  int partial_bit_count = mb->partial_bit_count;
272  int level, run, vlc_len, index;
273 
274  OPEN_READER_NOSIZE(re, gb);
275  UPDATE_CACHE(re, gb);
276 
277  /* if we must parse a partial VLC, we do it here */
278  if (partial_bit_count > 0) {
279  re_cache = re_cache >> partial_bit_count |
280  mb->partial_bit_buffer;
281  re_index -= partial_bit_count;
282  mb->partial_bit_count = 0;
283  }
284 
285  /* get the AC coefficients until last_index is reached */
286  for (;;) {
287  ff_dlog(NULL, "%2d: bits=%04"PRIx32" index=%u\n",
288  pos, SHOW_UBITS(re, gb, 16), re_index);
289  /* our own optimized GET_RL_VLC */
290  index = NEG_USR32(re_cache, TEX_VLC_BITS);
291  vlc_len = dv_rl_vlc[index].len;
292  if (vlc_len < 0) {
293  index = NEG_USR32((unsigned) re_cache << TEX_VLC_BITS, -vlc_len) +
295  vlc_len = TEX_VLC_BITS - vlc_len;
296  }
298  run = dv_rl_vlc[index].run;
299 
300  /* gotta check if we're still within gb boundaries */
301  if (re_index + vlc_len > last_index) {
302  /* should be < 16 bits otherwise a codeword could have been parsed */
303  mb->partial_bit_count = last_index - re_index;
304  mb->partial_bit_buffer = re_cache & ~(-1u >> mb->partial_bit_count);
305  re_index = last_index;
306  break;
307  }
308  re_index += vlc_len;
309 
310  ff_dlog(NULL, "run=%d level=%d\n", run, level);
311  pos += run;
312  if (pos >= 64)
313  break;
314 
315  level = (level * factor_table[pos] + (1 << (dv_iweight_bits - 1))) >>
317  block[scan_table[pos]] = level;
318 
319  UPDATE_CACHE(re, gb);
320  }
321  CLOSE_READER(re, gb);
322  mb->pos = pos;
323 }
324 
325 static inline void bit_copy(PutBitContext *pb, GetBitContext *gb)
326 {
327  int bits_left = get_bits_left(gb);
328  while (bits_left >= MIN_CACHE_BITS) {
330  bits_left -= MIN_CACHE_BITS;
331  }
332  if (bits_left > 0)
333  put_bits(pb, bits_left, get_bits(gb, bits_left));
334 }
335 
336 static av_always_inline void put_block_8x4(int16_t *block, uint8_t *av_restrict p, int stride)
337 {
338  int i, j;
339 
340  for (i = 0; i < 4; i++) {
341  for (j = 0; j < 8; j++)
342  p[j] = av_clip_uint8(block[j]);
343  block += 8;
344  p += stride;
345  }
346 }
347 
349  int stride, int16_t *blocks)
350 {
351  s->idsp.idct(blocks + 0*64);
352  s->idsp.idct(blocks + 1*64);
353 
354  put_block_8x4(blocks+0*64, data, stride<<1);
355  put_block_8x4(blocks+0*64 + 4*8, data + 8, stride<<1);
356  put_block_8x4(blocks+1*64, data + stride, stride<<1);
357  put_block_8x4(blocks+1*64 + 4*8, data + 8 + stride, stride<<1);
358 }
359 
361  int stride, int16_t *blocks)
362 {
363  s->idsp.idct(blocks + 0*64);
364  s->idsp.idct(blocks + 1*64);
365  s->idsp.idct(blocks + 2*64);
366  s->idsp.idct(blocks + 3*64);
367 
368  put_block_8x4(blocks+0*64, data, stride<<1);
369  put_block_8x4(blocks+0*64 + 4*8, data + 16, stride<<1);
370  put_block_8x4(blocks+1*64, data + 8, stride<<1);
371  put_block_8x4(blocks+1*64 + 4*8, data + 24, stride<<1);
372  put_block_8x4(blocks+2*64, data + stride, stride<<1);
373  put_block_8x4(blocks+2*64 + 4*8, data + 16 + stride, stride<<1);
374  put_block_8x4(blocks+3*64, data + 8 + stride, stride<<1);
375  put_block_8x4(blocks+3*64 + 4*8, data + 24 + stride, stride<<1);
376 }
377 
378 /* mb_x and mb_y are in units of 8 pixels */
379 static int dv_decode_video_segment(AVCodecContext *avctx, void *arg)
380 {
381  DVVideoContext *s = avctx->priv_data;
382  DVwork_chunk *work_chunk = arg;
383  int quant, dc, dct_mode, class1, j;
384  int mb_index, mb_x, mb_y, last_index;
385  int y_stride, linesize;
386  int16_t *block, *block1;
387  int c_offset;
388  uint8_t *y_ptr;
389  const uint8_t *buf_ptr;
390  PutBitContext pb, vs_pb;
391  GetBitContext gb;
392  BlockInfo mb_data[5 * DV_MAX_BPM], *mb, *mb1;
393  LOCAL_ALIGNED_16(int16_t, sblock, [5 * DV_MAX_BPM], [64]);
394  LOCAL_ALIGNED_16(uint8_t, mb_bit_buffer, [80 + AV_INPUT_BUFFER_PADDING_SIZE]); /* allow some slack */
395  LOCAL_ALIGNED_16(uint8_t, vs_bit_buffer, [80 * 5 + AV_INPUT_BUFFER_PADDING_SIZE]); /* allow some slack */
396  const int log2_blocksize = 3-s->avctx->lowres;
397  int is_field_mode[5];
398  int vs_bit_buffer_damaged = 0;
399  int mb_bit_buffer_damaged[5] = {0};
400  int retried = 0;
401  int sta;
402 
403  av_assert1((((uintptr_t) mb_bit_buffer) & 7) == 0);
404  av_assert1((((uintptr_t) vs_bit_buffer) & 7) == 0);
405 
406 retry:
407 
408  memset(sblock, 0, 5 * DV_MAX_BPM * sizeof(*sblock));
409 
410  /* pass 1: read DC and AC coefficients in blocks */
411  buf_ptr = &s->buf[work_chunk->buf_offset * 80];
412  block1 = &sblock[0][0];
413  mb1 = mb_data;
414  init_put_bits(&vs_pb, vs_bit_buffer, 5 * 80);
415  for (mb_index = 0; mb_index < 5; mb_index++, mb1 += s->sys->bpm, block1 += s->sys->bpm * 64) {
416  /* skip header */
417  quant = buf_ptr[3] & 0x0f;
418  if (avctx->error_concealment) {
419  if ((buf_ptr[3] >> 4) == 0x0E)
420  vs_bit_buffer_damaged = 1;
421  if (!mb_index) {
422  sta = buf_ptr[3] >> 4;
423  } else if (sta != (buf_ptr[3] >> 4))
424  vs_bit_buffer_damaged = 1;
425  }
426  buf_ptr += 4;
427  init_put_bits(&pb, mb_bit_buffer, 80);
428  mb = mb1;
429  block = block1;
430  is_field_mode[mb_index] = 0;
431  for (j = 0; j < s->sys->bpm; j++) {
432  last_index = s->sys->block_sizes[j];
433  init_get_bits(&gb, buf_ptr, last_index);
434 
435  /* get the DC */
436  dc = get_sbits(&gb, 9);
437  dct_mode = get_bits1(&gb);
438  class1 = get_bits(&gb, 2);
439  if (DV_PROFILE_IS_HD(s->sys)) {
440  mb->idct_put = s->idct_put[0];
441  mb->scan_table = s->dv_zigzag[0];
442  mb->factor_table = &s->idct_factor[(j >= 4) * 4 * 16 * 64 +
443  class1 * 16 * 64 +
444  quant * 64];
445  is_field_mode[mb_index] |= !j && dct_mode;
446  } else {
447  mb->idct_put = s->idct_put[dct_mode && log2_blocksize == 3];
448  mb->scan_table = s->dv_zigzag[dct_mode];
449  mb->factor_table =
450  &s->idct_factor[(class1 == 3) * 2 * 22 * 64 +
451  dct_mode * 22 * 64 +
452  (quant + ff_dv_quant_offset[class1]) * 64];
453  }
454  dc = dc * 4;
455  /* convert to unsigned because 128 is not added in the
456  * standard IDCT */
457  dc += 1024;
458  block[0] = dc;
459  buf_ptr += last_index >> 3;
460  mb->pos = 0;
461  mb->partial_bit_count = 0;
462 
463  ff_dlog(avctx, "MB block: %d, %d ", mb_index, j);
464  dv_decode_ac(&gb, mb, block);
465 
466  /* write the remaining bits in a new buffer only if the
467  * block is finished */
468  if (mb->pos >= 64)
469  bit_copy(&pb, &gb);
470  if (mb->pos >= 64 && mb->pos < 127)
471  vs_bit_buffer_damaged = mb_bit_buffer_damaged[mb_index] = 1;
472 
473  block += 64;
474  mb++;
475  }
476 
477  if (mb_bit_buffer_damaged[mb_index] > 0)
478  continue;
479 
480  /* pass 2: we can do it just after */
481  ff_dlog(avctx, "***pass 2 size=%d MB#=%d\n", put_bits_count(&pb), mb_index);
482  block = block1;
483  mb = mb1;
484  init_get_bits(&gb, mb_bit_buffer, put_bits_count(&pb));
485  put_bits32(&pb, 0); // padding must be zeroed
486  flush_put_bits(&pb);
487  for (j = 0; j < s->sys->bpm; j++, block += 64, mb++) {
488  if (mb->pos < 64 && get_bits_left(&gb) > 0) {
489  dv_decode_ac(&gb, mb, block);
490  /* if still not finished, no need to parse other blocks */
491  if (mb->pos < 64)
492  break;
493  if (mb->pos < 127)
494  vs_bit_buffer_damaged = mb_bit_buffer_damaged[mb_index] = 1;
495  }
496  }
497  /* all blocks are finished, so the extra bytes can be used at
498  * the video segment level */
499  if (j >= s->sys->bpm)
500  bit_copy(&vs_pb, &gb);
501  }
502 
503  /* we need a pass over the whole video segment */
504  ff_dlog(avctx, "***pass 3 size=%d\n", put_bits_count(&vs_pb));
505  block = &sblock[0][0];
506  mb = mb_data;
507  init_get_bits(&gb, vs_bit_buffer, put_bits_count(&vs_pb));
508  put_bits32(&vs_pb, 0); // padding must be zeroed
509  flush_put_bits(&vs_pb);
510  for (mb_index = 0; mb_index < 5; mb_index++) {
511  for (j = 0; j < s->sys->bpm; j++) {
512  if (mb->pos < 64 && get_bits_left(&gb) > 0 && !vs_bit_buffer_damaged) {
513  ff_dlog(avctx, "start %d:%d\n", mb_index, j);
514  dv_decode_ac(&gb, mb, block);
515  }
516 
517  if (mb->pos >= 64 && mb->pos < 127) {
518  av_log(avctx, AV_LOG_ERROR,
519  "AC EOB marker is absent pos=%d\n", mb->pos);
520  vs_bit_buffer_damaged = 1;
521  }
522  block += 64;
523  mb++;
524  }
525  }
526  if (vs_bit_buffer_damaged && !retried) {
527  av_log(avctx, AV_LOG_ERROR, "Concealing bitstream errors\n");
528  retried = 1;
529  goto retry;
530  }
531 
532  /* compute idct and place blocks */
533  block = &sblock[0][0];
534  mb = mb_data;
535  for (mb_index = 0; mb_index < 5; mb_index++) {
536  dv_calculate_mb_xy(s, work_chunk, mb_index, &mb_x, &mb_y);
537 
538  /* idct_put'ting luminance */
539  if ((s->sys->pix_fmt == AV_PIX_FMT_YUV420P) ||
540  (s->sys->pix_fmt == AV_PIX_FMT_YUV411P && mb_x >= (704 / 8)) ||
541  (s->sys->height >= 720 && mb_y != 134)) {
542  y_stride = (s->frame->linesize[0] <<
543  ((!is_field_mode[mb_index]) * log2_blocksize));
544  } else {
545  y_stride = (2 << log2_blocksize);
546  }
547  y_ptr = s->frame->data[0] +
548  ((mb_y * s->frame->linesize[0] + mb_x) << log2_blocksize);
549  if (mb_y == 134 && is_field_mode[mb_index]) {
550  dv100_idct_put_last_row_field_luma(s, y_ptr, s->frame->linesize[0], block);
551  } else {
552  linesize = s->frame->linesize[0] << is_field_mode[mb_index];
553  mb[0].idct_put(y_ptr, linesize, block + 0 * 64);
554  if (s->sys->video_stype == 4) { /* SD 422 */
555  mb[2].idct_put(y_ptr + (1 << log2_blocksize), linesize, block + 2 * 64);
556  } else {
557  mb[1].idct_put(y_ptr + (1 << log2_blocksize), linesize, block + 1 * 64);
558  mb[2].idct_put(y_ptr + y_stride, linesize, block + 2 * 64);
559  mb[3].idct_put(y_ptr + (1 << log2_blocksize) + y_stride, linesize, block + 3 * 64);
560  }
561  }
562  mb += 4;
563  block += 4 * 64;
564 
565  /* idct_put'ting chrominance */
566  c_offset = (((mb_y >> (s->sys->pix_fmt == AV_PIX_FMT_YUV420P)) * s->frame->linesize[1] +
567  (mb_x >> ((s->sys->pix_fmt == AV_PIX_FMT_YUV411P) ? 2 : 1))) << log2_blocksize);
568  for (j = 2; j; j--) {
569  uint8_t *c_ptr = s->frame->data[j] + c_offset;
570  if (s->sys->pix_fmt == AV_PIX_FMT_YUV411P && mb_x >= (704 / 8)) {
571  uint64_t aligned_pixels[64 / 8];
572  uint8_t *pixels = (uint8_t *) aligned_pixels;
573  uint8_t *c_ptr1, *ptr1;
574  int x, y;
575  mb->idct_put(pixels, 8, block);
576  for (y = 0; y < (1 << log2_blocksize); y++, c_ptr += s->frame->linesize[j], pixels += 8) {
577  ptr1 = pixels + ((1 << (log2_blocksize))>>1);
578  c_ptr1 = c_ptr + (s->frame->linesize[j] << log2_blocksize);
579  for (x = 0; x < (1 << FFMAX(log2_blocksize - 1, 0)); x++) {
580  c_ptr[x] = pixels[x];
581  c_ptr1[x] = ptr1[x];
582  }
583  }
584  block += 64;
585  mb++;
586  } else {
587  y_stride = (mb_y == 134) ? (1 << log2_blocksize) :
588  s->frame->linesize[j] << ((!is_field_mode[mb_index]) * log2_blocksize);
589  if (mb_y == 134 && is_field_mode[mb_index]) {
590  dv100_idct_put_last_row_field_chroma(s, c_ptr, s->frame->linesize[j], block);
591  mb += 2;
592  block += 2*64;
593  } else {
594  linesize = s->frame->linesize[j] << is_field_mode[mb_index];
595  (mb++)->idct_put(c_ptr, linesize, block);
596  block += 64;
597  if (s->sys->bpm == 8) {
598  (mb++)->idct_put(c_ptr + y_stride, linesize, block);
599  block += 64;
600  }
601  }
602  }
603  }
604  }
605  return 0;
606 }
607 
608 /* NOTE: exactly one frame must be given (120000 bytes for NTSC,
609  * 144000 bytes for PAL - or twice those for 50Mbps) */
611  int *got_frame, AVPacket *avpkt)
612 {
613  uint8_t *buf = avpkt->data;
614  int buf_size = avpkt->size;
615  DVVideoContext *s = avctx->priv_data;
616  const uint8_t *vsc_pack;
617  int apt, is16_9, ret;
618  const AVDVProfile *sys;
619 
620  sys = ff_dv_frame_profile(avctx, s->sys, buf, buf_size);
621  if (!sys || buf_size < sys->frame_size) {
622  av_log(avctx, AV_LOG_ERROR, "could not find dv frame profile\n");
623  return -1; /* NOTE: we only accept several full frames */
624  }
625 
626  if (sys != s->sys) {
628  if (ret < 0) {
629  av_log(avctx, AV_LOG_ERROR, "Error initializing the work tables.\n");
630  return ret;
631  }
632  dv_init_weight_tables(s, sys);
633  s->sys = sys;
634  }
635 
636  s->frame = frame;
637  frame->key_frame = 1;
638  frame->pict_type = AV_PICTURE_TYPE_I;
639  avctx->pix_fmt = s->sys->pix_fmt;
640  avctx->framerate = av_inv_q(s->sys->time_base);
641 
642  ret = ff_set_dimensions(avctx, s->sys->width, s->sys->height);
643  if (ret < 0)
644  return ret;
645 
646  /* Determine the codec's sample_aspect ratio from the packet */
647  vsc_pack = buf + 80 * 5 + 48 + 5;
648  if (*vsc_pack == dv_video_control) {
649  apt = buf[4] & 0x07;
650  is16_9 = (vsc_pack[2] & 0x07) == 0x02 ||
651  (!apt && (vsc_pack[2] & 0x07) == 0x07);
652  ff_set_sar(avctx, s->sys->sar[is16_9]);
653  }
654 
655  if ((ret = ff_thread_get_buffer(avctx, frame, 0)) < 0)
656  return ret;
657 
658  /* Determine the codec's field order from the packet */
659  if ( *vsc_pack == dv_video_control ) {
660  if (avctx->height == 720) {
661  frame->interlaced_frame = 0;
662  frame->top_field_first = 0;
663  } else if (avctx->height == 1080) {
664  frame->interlaced_frame = 1;
665  frame->top_field_first = (vsc_pack[3] & 0x40) == 0x40;
666  } else {
667  frame->interlaced_frame = (vsc_pack[3] & 0x10) == 0x10;
668  frame->top_field_first = !(vsc_pack[3] & 0x40);
669  }
670  }
671 
672  s->buf = buf;
673  avctx->execute(avctx, dv_decode_video_segment, s->work_chunks, NULL,
674  dv_work_pool_size(s->sys), sizeof(DVwork_chunk));
675 
676  emms_c();
677 
678  /* return image */
679  *got_frame = 1;
680 
681  return s->sys->frame_size;
682 }
683 
685  .p.name = "dvvideo",
686  .p.long_name = NULL_IF_CONFIG_SMALL("DV (Digital Video)"),
687  .p.type = AVMEDIA_TYPE_VIDEO,
688  .p.id = AV_CODEC_ID_DVVIDEO,
689  .priv_data_size = sizeof(DVVideoContext),
693  .p.max_lowres = 3,
694  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
695 };
level
uint8_t level
Definition: svq3.c:206
DV_MAX_BPM
#define DV_MAX_BPM
maximum number of blocks per macroblock in any DV format
Definition: dv.h:97
get_bits_left
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:850
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.h:37
mem_internal.h
dv100_idct_put_last_row_field_luma
static void dv100_idct_put_last_row_field_luma(DVVideoContext *s, uint8_t *data, int stride, int16_t *blocks)
Definition: dvdec.c:360
dv_profile_internal.h
u
#define u(width, name, range_min, range_max)
Definition: cbs_h2645.c:264
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
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:69
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
pixdesc.h
DVwork_chunk
Definition: dv.h:36
bit_copy
static void bit_copy(PutBitContext *pb, GetBitContext *gb)
Definition: dvdec.c:325
internal.h
AVPacket::data
uint8_t * data
Definition: packet.h:374
init_vlc
#define init_vlc(vlc, nb_bits, nb_codes, bits, bits_wrap, bits_size, codes, codes_wrap, codes_size, flags)
Definition: vlc.h:43
RL_VLC_ELEM::run
uint8_t run
Definition: vlc.h:40
data
const char data[16]
Definition: mxf.c:143
FFCodec
Definition: codec_internal.h:112
VLCElem::len
VLCBaseType len
Definition: vlc.h:28
UPDATE_CACHE
#define UPDATE_CACHE(name, gb)
Definition: get_bits.h:179
FFMAX
#define FFMAX(a, b)
Definition: macros.h:47
dv_init_weight_tables
static void dv_init_weight_tables(DVVideoContext *ctx, const AVDVProfile *d)
Definition: dvdec.c:191
init_get_bits
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:660
thread.h
ff_idctdsp_init
av_cold void ff_idctdsp_init(IDCTDSPContext *c, AVCodecContext *avctx)
Definition: idctdsp.c:240
OPEN_READER_NOSIZE
#define OPEN_READER_NOSIZE(name, gb)
Definition: get_bits.h:134
init
static int init
Definition: av_tx.c:47
AVCodecContext::framerate
AVRational framerate
Definition: avcodec.h:1733
get_bits
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:380
FFCodec::p
AVCodec p
The public AVCodec.
Definition: codec_internal.h:116
GetBitContext
Definition: get_bits.h:62
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
dv100_idct_put_last_row_field_chroma
static void dv100_idct_put_last_row_field_chroma(DVVideoContext *s, uint8_t *data, int stride, int16_t *blocks)
Definition: dvdec.c:348
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:112
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:68
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:92
avassert.h
ff_thread_once
static int ff_thread_once(char *control, void(*routine)(void))
Definition: thread.h:179
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
ff_dv_init_dynamic_tables
int ff_dv_init_dynamic_tables(DVVideoContext *ctx, const AVDVProfile *d)
Definition: dv.c:165
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:379
dvvideo_decode_init
static av_cold int dvvideo_decode_init(AVCodecContext *avctx)
Definition: dvdec.c:237
CLOSE_READER
#define CLOSE_READER(name, gb)
Definition: get_bits.h:150
FF_CODEC_DECODE_CB
#define FF_CODEC_DECODE_CB(func)
Definition: codec_internal.h:254
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:265
frame_size
int frame_size
Definition: mxfenc.c:2201
AVCodecContext::error_concealment
int error_concealment
error concealment flags
Definition: avcodec.h:1312
vlc_buf
static VLCElem vlc_buf[16716]
Definition: clearvideo.c:87
LOCAL_ALIGNED_16
#define LOCAL_ALIGNED_16(t, v,...)
Definition: mem_internal.h:130
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:360
ctx
AVFormatContext * ctx
Definition: movenc.c:48
get_bits.h
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
arg
const char * arg
Definition: jacosubdec.c:67
dv_iweight_720_c
static const uint16_t dv_iweight_720_c[64]
Definition: dvdec.c:122
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:177
dvvideo_decode_frame
static int dvvideo_decode_frame(AVCodecContext *avctx, AVFrame *frame, int *got_frame, AVPacket *avpkt)
Definition: dvdec.c:610
NULL
#define NULL
Definition: coverity.c:32
run
uint8_t run
Definition: svq3.c:205
idct_put
static void idct_put(FourXContext *f, int x, int y)
Definition: 4xm.c:559
BlockInfo::idct_put
void(* idct_put)(uint8_t *dest, ptrdiff_t stride, int16_t *block)
Definition: dvdec.c:60
DVVideoContext
Definition: dv.h:41
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:499
INIT_VLC_USE_NEW_STATIC
#define INIT_VLC_USE_NEW_STATIC
Definition: vlc.h:100
AVOnce
#define AVOnce
Definition: thread.h:176
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:1455
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
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
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:136
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
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:242
DV_PROFILE_IS_HD
#define DV_PROFILE_IS_HD(p)
Definition: dv.h:84
ff_dv_vlc_run
const uint8_t ff_dv_vlc_run[NB_DV_VLC]
Definition: dvdata.c:187
mb
#define mb
Definition: vf_colormatrix.c:101
NEG_USR32
#define NEG_USR32(a, s)
Definition: mathops.h:168
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:271
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
ff_dv_vlc_bits
const uint16_t ff_dv_vlc_bits[NB_DV_VLC]
Definition: dvdata.c:77
dv_iweight_248
static const uint16_t dv_iweight_248[64]
Definition: dvdec.c:78
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:129
av_always_inline
#define av_always_inline
Definition: attributes.h:49
FF_CODEC_CAP_INIT_THREADSAFE
#define FF_CODEC_CAP_INIT_THREADSAFE
The codec does not modify any global variables in the init function, allowing to call the init functi...
Definition: codec_internal.h:31
AV_CODEC_ID_DVVIDEO
@ AV_CODEC_ID_DVVIDEO
Definition: codec_id.h:74
dv_work_pool_size
static int dv_work_pool_size(const AVDVProfile *d)
Definition: dv.h:103
dv_video_control
@ dv_video_control
Definition: dv.h:78
put_block_8x4
static av_always_inline void put_block_8x4(int16_t *block, uint8_t *av_restrict p, int stride)
Definition: dvdec.c:336
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:203
av_inv_q
static av_always_inline AVRational av_inv_q(AVRational q)
Invert a rational.
Definition: rational.h:159
BlockInfo::scan_table
const uint8_t * scan_table
Definition: dvdec.c:58
len
int len
Definition: vorbis_enc_data.h:426
AVCodecContext::height
int height
Definition: avcodec.h:562
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:599
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:132
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
dv_calculate_mb_xy
static void dv_calculate_mb_xy(DVVideoContext *s, DVwork_chunk *work_chunk, int m, int *mb_x, int *mb_y)
Definition: dv.h:113
TEX_VLC_BITS
#define TEX_VLC_BITS
Definition: dvdec.c:133
pos
unsigned int pos
Definition: spdifenc.c:412
AV_INPUT_BUFFER_PADDING_SIZE
#define AV_INPUT_BUFFER_PADDING_SIZE
Definition: defs.h:40
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:105
AVCodecContext
main external API structure.
Definition: avcodec.h:389
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:1514
SHOW_UBITS
#define SHOW_UBITS(name, gb, num)
Definition: get_bits.h:212
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
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:90
flush_put_bits
static void flush_put_bits(PutBitContext *s)
Pad the end of the output stream with zeros.
Definition: put_bits.h:143
ff_dvvideo_init
av_cold int ff_dvvideo_init(AVCodecContext *avctx)
Definition: dv.c:188
dv_iweight_1080_c
static const uint16_t dv_iweight_1080_c[64]
Definition: dvdec.c:102
AVPacket
This structure stores compressed data.
Definition: packet.h:351
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:416
dv_init_static
static void dv_init_static(void)
Definition: dvdec.c:138
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:153
imgutils.h
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:66
block1
static int16_t block1[64]
Definition: dct.c:118
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:684