Libav
svq1dec.c
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1 /*
2  * SVQ1 decoder
3  * ported to MPlayer by Arpi <arpi@thot.banki.hu>
4  * ported to libavcodec by Nick Kurshev <nickols_k@mail.ru>
5  *
6  * Copyright (C) 2002 the xine project
7  * Copyright (C) 2002 the ffmpeg project
8  *
9  * SVQ1 Encoder (c) 2004 Mike Melanson <melanson@pcisys.net>
10  *
11  * This file is part of Libav.
12  *
13  * Libav is free software; you can redistribute it and/or
14  * modify it under the terms of the GNU Lesser General Public
15  * License as published by the Free Software Foundation; either
16  * version 2.1 of the License, or (at your option) any later version.
17  *
18  * Libav is distributed in the hope that it will be useful,
19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21  * Lesser General Public License for more details.
22  *
23  * You should have received a copy of the GNU Lesser General Public
24  * License along with Libav; if not, write to the Free Software
25  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
26  */
27 
35 #include "avcodec.h"
36 #include "get_bits.h"
37 #include "h263.h"
38 #include "hpeldsp.h"
39 #include "internal.h"
40 #include "mathops.h"
41 #include "svq1.h"
42 
43 #undef NDEBUG
44 #include <assert.h>
45 
52 
53 /* motion vector (prediction) */
54 typedef struct svq1_pmv_s {
55  int x;
56  int y;
57 } svq1_pmv;
58 
59 typedef struct SVQ1Context {
63  int width;
64  int height;
66  int nonref; // 1 if the current frame won't be referenced
67 } SVQ1Context;
68 
69 static const uint8_t string_table[256] = {
70  0x00, 0xD5, 0x7F, 0xAA, 0xFE, 0x2B, 0x81, 0x54,
71  0x29, 0xFC, 0x56, 0x83, 0xD7, 0x02, 0xA8, 0x7D,
72  0x52, 0x87, 0x2D, 0xF8, 0xAC, 0x79, 0xD3, 0x06,
73  0x7B, 0xAE, 0x04, 0xD1, 0x85, 0x50, 0xFA, 0x2F,
74  0xA4, 0x71, 0xDB, 0x0E, 0x5A, 0x8F, 0x25, 0xF0,
75  0x8D, 0x58, 0xF2, 0x27, 0x73, 0xA6, 0x0C, 0xD9,
76  0xF6, 0x23, 0x89, 0x5C, 0x08, 0xDD, 0x77, 0xA2,
77  0xDF, 0x0A, 0xA0, 0x75, 0x21, 0xF4, 0x5E, 0x8B,
78  0x9D, 0x48, 0xE2, 0x37, 0x63, 0xB6, 0x1C, 0xC9,
79  0xB4, 0x61, 0xCB, 0x1E, 0x4A, 0x9F, 0x35, 0xE0,
80  0xCF, 0x1A, 0xB0, 0x65, 0x31, 0xE4, 0x4E, 0x9B,
81  0xE6, 0x33, 0x99, 0x4C, 0x18, 0xCD, 0x67, 0xB2,
82  0x39, 0xEC, 0x46, 0x93, 0xC7, 0x12, 0xB8, 0x6D,
83  0x10, 0xC5, 0x6F, 0xBA, 0xEE, 0x3B, 0x91, 0x44,
84  0x6B, 0xBE, 0x14, 0xC1, 0x95, 0x40, 0xEA, 0x3F,
85  0x42, 0x97, 0x3D, 0xE8, 0xBC, 0x69, 0xC3, 0x16,
86  0xEF, 0x3A, 0x90, 0x45, 0x11, 0xC4, 0x6E, 0xBB,
87  0xC6, 0x13, 0xB9, 0x6C, 0x38, 0xED, 0x47, 0x92,
88  0xBD, 0x68, 0xC2, 0x17, 0x43, 0x96, 0x3C, 0xE9,
89  0x94, 0x41, 0xEB, 0x3E, 0x6A, 0xBF, 0x15, 0xC0,
90  0x4B, 0x9E, 0x34, 0xE1, 0xB5, 0x60, 0xCA, 0x1F,
91  0x62, 0xB7, 0x1D, 0xC8, 0x9C, 0x49, 0xE3, 0x36,
92  0x19, 0xCC, 0x66, 0xB3, 0xE7, 0x32, 0x98, 0x4D,
93  0x30, 0xE5, 0x4F, 0x9A, 0xCE, 0x1B, 0xB1, 0x64,
94  0x72, 0xA7, 0x0D, 0xD8, 0x8C, 0x59, 0xF3, 0x26,
95  0x5B, 0x8E, 0x24, 0xF1, 0xA5, 0x70, 0xDA, 0x0F,
96  0x20, 0xF5, 0x5F, 0x8A, 0xDE, 0x0B, 0xA1, 0x74,
97  0x09, 0xDC, 0x76, 0xA3, 0xF7, 0x22, 0x88, 0x5D,
98  0xD6, 0x03, 0xA9, 0x7C, 0x28, 0xFD, 0x57, 0x82,
99  0xFF, 0x2A, 0x80, 0x55, 0x01, 0xD4, 0x7E, 0xAB,
100  0x84, 0x51, 0xFB, 0x2E, 0x7A, 0xAF, 0x05, 0xD0,
101  0xAD, 0x78, 0xD2, 0x07, 0x53, 0x86, 0x2C, 0xF9
102 };
103 
104 #define SVQ1_PROCESS_VECTOR() \
105  for (; level > 0; i++) { \
106  /* process next depth */ \
107  if (i == m) { \
108  m = n; \
109  if (--level == 0) \
110  break; \
111  } \
112  /* divide block if next bit set */ \
113  if (get_bits1(bitbuf) == 0) \
114  break; \
115  /* add child nodes */ \
116  list[n++] = list[i]; \
117  list[n++] = list[i] + \
118  (((level & 1) ? pitch : 1) << (level / 2 + 1)); \
119  }
120 
121 #define SVQ1_ADD_CODEBOOK() \
122  /* add codebook entries to vector */ \
123  for (j = 0; j < stages; j++) { \
124  n3 = codebook[entries[j]] ^ 0x80808080; \
125  n1 += (n3 & 0xFF00FF00) >> 8; \
126  n2 += n3 & 0x00FF00FF; \
127  } \
128  \
129  /* clip to [0..255] */ \
130  if (n1 & 0xFF00FF00) { \
131  n3 = (n1 >> 15 & 0x00010001 | 0x01000100) - 0x00010001; \
132  n1 += 0x7F007F00; \
133  n1 |= (~n1 >> 15 & 0x00010001 | 0x01000100) - 0x00010001; \
134  n1 &= n3 & 0x00FF00FF; \
135  } \
136  \
137  if (n2 & 0xFF00FF00) { \
138  n3 = (n2 >> 15 & 0x00010001 | 0x01000100) - 0x00010001; \
139  n2 += 0x7F007F00; \
140  n2 |= (~n2 >> 15 & 0x00010001 | 0x01000100) - 0x00010001; \
141  n2 &= n3 & 0x00FF00FF; \
142  }
143 
144 #define SVQ1_CALC_CODEBOOK_ENTRIES(cbook) \
145  codebook = (const uint32_t *)cbook[level]; \
146  if (stages > 0) \
147  bit_cache = get_bits(bitbuf, 4 * stages); \
148  /* calculate codebook entries for this vector */ \
149  for (j = 0; j < stages; j++) { \
150  entries[j] = (((bit_cache >> (4 * (stages - j - 1))) & 0xF) + \
151  16 * j) << (level + 1); \
152  } \
153  mean -= stages * 128; \
154  n4 = mean + (mean >> 31) << 16 | (mean & 0xFFFF);
155 
156 static int svq1_decode_block_intra(GetBitContext *bitbuf, uint8_t *pixels,
157  int pitch)
158 {
159  uint32_t bit_cache;
160  uint8_t *list[63];
161  uint32_t *dst;
162  const uint32_t *codebook;
163  int entries[6];
164  int i, j, m, n;
165  int mean, stages;
166  unsigned x, y, width, height, level;
167  uint32_t n1, n2, n3, n4;
168 
169  /* initialize list for breadth first processing of vectors */
170  list[0] = pixels;
171 
172  /* recursively process vector */
173  for (i = 0, m = 1, n = 1, level = 5; i < n; i++) {
175 
176  /* destination address and vector size */
177  dst = (uint32_t *)list[i];
178  width = 1 << ((4 + level) / 2);
179  height = 1 << ((3 + level) / 2);
180 
181  /* get number of stages (-1 skips vector, 0 for mean only) */
182  stages = get_vlc2(bitbuf, svq1_intra_multistage[level].table, 3, 3) - 1;
183 
184  if (stages == -1) {
185  for (y = 0; y < height; y++)
186  memset(&dst[y * (pitch / 4)], 0, width);
187  continue; /* skip vector */
188  }
189 
190  if (stages > 0 && level >= 4) {
191  av_dlog(NULL,
192  "Error (svq1_decode_block_intra): invalid vector: stages=%i level=%i\n",
193  stages, level);
194  return AVERROR_INVALIDDATA; /* invalid vector */
195  }
196 
197  mean = get_vlc2(bitbuf, svq1_intra_mean.table, 8, 3);
198 
199  if (stages == 0) {
200  for (y = 0; y < height; y++)
201  memset(&dst[y * (pitch / 4)], mean, width);
202  } else {
204 
205  for (y = 0; y < height; y++) {
206  for (x = 0; x < width / 4; x++, codebook++) {
207  n1 = n4;
208  n2 = n4;
210  /* store result */
211  dst[x] = n1 << 8 | n2;
212  }
213  dst += pitch / 4;
214  }
215  }
216  }
217 
218  return 0;
219 }
220 
222  int pitch)
223 {
224  uint32_t bit_cache;
225  uint8_t *list[63];
226  uint32_t *dst;
227  const uint32_t *codebook;
228  int entries[6];
229  int i, j, m, n;
230  int mean, stages;
231  int x, y, width, height, level;
232  uint32_t n1, n2, n3, n4;
233 
234  /* initialize list for breadth first processing of vectors */
235  list[0] = pixels;
236 
237  /* recursively process vector */
238  for (i = 0, m = 1, n = 1, level = 5; i < n; i++) {
240 
241  /* destination address and vector size */
242  dst = (uint32_t *)list[i];
243  width = 1 << ((4 + level) / 2);
244  height = 1 << ((3 + level) / 2);
245 
246  /* get number of stages (-1 skips vector, 0 for mean only) */
247  stages = get_vlc2(bitbuf, svq1_inter_multistage[level].table, 3, 2) - 1;
248 
249  if (stages == -1)
250  continue; /* skip vector */
251 
252  if ((stages > 0) && (level >= 4)) {
253  av_dlog(NULL,
254  "Error (svq1_decode_block_non_intra): invalid vector: stages=%i level=%i\n",
255  stages, level);
256  return AVERROR_INVALIDDATA; /* invalid vector */
257  }
258 
259  mean = get_vlc2(bitbuf, svq1_inter_mean.table, 9, 3) - 256;
260 
262 
263  for (y = 0; y < height; y++) {
264  for (x = 0; x < width / 4; x++, codebook++) {
265  n3 = dst[x];
266  /* add mean value to vector */
267  n1 = n4 + ((n3 & 0xFF00FF00) >> 8);
268  n2 = n4 + (n3 & 0x00FF00FF);
270  /* store result */
271  dst[x] = n1 << 8 | n2;
272  }
273  dst += pitch / 4;
274  }
275  }
276  return 0;
277 }
278 
280  svq1_pmv **pmv)
281 {
282  int diff;
283  int i;
284 
285  for (i = 0; i < 2; i++) {
286  /* get motion code */
287  diff = get_vlc2(bitbuf, svq1_motion_component.table, 7, 2);
288  if (diff < 0)
289  return AVERROR_INVALIDDATA;
290  else if (diff) {
291  if (get_bits1(bitbuf))
292  diff = -diff;
293  }
294 
295  /* add median of motion vector predictors and clip result */
296  if (i == 1)
297  mv->y = sign_extend(diff + mid_pred(pmv[0]->y, pmv[1]->y, pmv[2]->y), 6);
298  else
299  mv->x = sign_extend(diff + mid_pred(pmv[0]->x, pmv[1]->x, pmv[2]->x), 6);
300  }
301 
302  return 0;
303 }
304 
305 static void svq1_skip_block(uint8_t *current, uint8_t *previous,
306  int pitch, int x, int y)
307 {
308  uint8_t *src;
309  uint8_t *dst;
310  int i;
311 
312  src = &previous[x + y * pitch];
313  dst = current;
314 
315  for (i = 0; i < 16; i++) {
316  memcpy(dst, src, 16);
317  src += pitch;
318  dst += pitch;
319  }
320 }
321 
323  uint8_t *current, uint8_t *previous,
324  int pitch, svq1_pmv *motion, int x, int y,
325  int width, int height)
326 {
327  uint8_t *src;
328  uint8_t *dst;
329  svq1_pmv mv;
330  svq1_pmv *pmv[3];
331  int result;
332 
333  /* predict and decode motion vector */
334  pmv[0] = &motion[0];
335  if (y == 0) {
336  pmv[1] =
337  pmv[2] = pmv[0];
338  } else {
339  pmv[1] = &motion[x / 8 + 2];
340  pmv[2] = &motion[x / 8 + 4];
341  }
342 
343  result = svq1_decode_motion_vector(bitbuf, &mv, pmv);
344 
345  if (result != 0)
346  return result;
347 
348  motion[0].x =
349  motion[x / 8 + 2].x =
350  motion[x / 8 + 3].x = mv.x;
351  motion[0].y =
352  motion[x / 8 + 2].y =
353  motion[x / 8 + 3].y = mv.y;
354 
355  mv.x = av_clip(mv.x, -2 * x, 2 * (width - x - 16));
356  mv.y = av_clip(mv.y, -2 * y, 2 * (height - y - 16));
357 
358  src = &previous[(x + (mv.x >> 1)) + (y + (mv.y >> 1)) * pitch];
359  dst = current;
360 
361  hdsp->put_pixels_tab[0][(mv.y & 1) << 1 | (mv.x & 1)](dst, src, pitch, 16);
362 
363  return 0;
364 }
365 
367  uint8_t *current, uint8_t *previous,
368  int pitch, svq1_pmv *motion, int x, int y,
369  int width, int height)
370 {
371  uint8_t *src;
372  uint8_t *dst;
373  svq1_pmv mv;
374  svq1_pmv *pmv[4];
375  int i, result;
376 
377  /* predict and decode motion vector (0) */
378  pmv[0] = &motion[0];
379  if (y == 0) {
380  pmv[1] =
381  pmv[2] = pmv[0];
382  } else {
383  pmv[1] = &motion[(x / 8) + 2];
384  pmv[2] = &motion[(x / 8) + 4];
385  }
386 
387  result = svq1_decode_motion_vector(bitbuf, &mv, pmv);
388 
389  if (result != 0)
390  return result;
391 
392  /* predict and decode motion vector (1) */
393  pmv[0] = &mv;
394  if (y == 0) {
395  pmv[1] =
396  pmv[2] = pmv[0];
397  } else {
398  pmv[1] = &motion[(x / 8) + 3];
399  }
400  result = svq1_decode_motion_vector(bitbuf, &motion[0], pmv);
401 
402  if (result != 0)
403  return result;
404 
405  /* predict and decode motion vector (2) */
406  pmv[1] = &motion[0];
407  pmv[2] = &motion[(x / 8) + 1];
408 
409  result = svq1_decode_motion_vector(bitbuf, &motion[(x / 8) + 2], pmv);
410 
411  if (result != 0)
412  return result;
413 
414  /* predict and decode motion vector (3) */
415  pmv[2] = &motion[(x / 8) + 2];
416  pmv[3] = &motion[(x / 8) + 3];
417 
418  result = svq1_decode_motion_vector(bitbuf, pmv[3], pmv);
419 
420  if (result != 0)
421  return result;
422 
423  /* form predictions */
424  for (i = 0; i < 4; i++) {
425  int mvx = pmv[i]->x + (i & 1) * 16;
426  int mvy = pmv[i]->y + (i >> 1) * 16;
427 
428  // FIXME: clipping or padding?
429  mvx = av_clip(mvx, -2 * x, 2 * (width - x - 8));
430  mvy = av_clip(mvy, -2 * y, 2 * (height - y - 8));
431 
432  src = &previous[(x + (mvx >> 1)) + (y + (mvy >> 1)) * pitch];
433  dst = current;
434 
435  hdsp->put_pixels_tab[1][((mvy & 1) << 1) | (mvx & 1)](dst, src, pitch, 8);
436 
437  /* select next block */
438  if (i & 1)
439  current += 8 * (pitch - 1);
440  else
441  current += 8;
442  }
443 
444  return 0;
445 }
446 
448  GetBitContext *bitbuf,
449  uint8_t *current, uint8_t *previous,
450  int pitch, svq1_pmv *motion, int x, int y,
451  int width, int height)
452 {
453  uint32_t block_type;
454  int result = 0;
455 
456  /* get block type */
457  block_type = get_vlc2(bitbuf, svq1_block_type.table, 2, 2);
458 
459  /* reset motion vectors */
460  if (block_type == SVQ1_BLOCK_SKIP || block_type == SVQ1_BLOCK_INTRA) {
461  motion[0].x =
462  motion[0].y =
463  motion[x / 8 + 2].x =
464  motion[x / 8 + 2].y =
465  motion[x / 8 + 3].x =
466  motion[x / 8 + 3].y = 0;
467  }
468 
469  switch (block_type) {
470  case SVQ1_BLOCK_SKIP:
471  svq1_skip_block(current, previous, pitch, x, y);
472  break;
473 
474  case SVQ1_BLOCK_INTER:
475  result = svq1_motion_inter_block(hdsp, bitbuf, current, previous,
476  pitch, motion, x, y, width, height);
477 
478  if (result != 0) {
479  av_dlog(avctx, "Error in svq1_motion_inter_block %i\n", result);
480  break;
481  }
482  result = svq1_decode_block_non_intra(bitbuf, current, pitch);
483  break;
484 
485  case SVQ1_BLOCK_INTER_4V:
486  result = svq1_motion_inter_4v_block(hdsp, bitbuf, current, previous,
487  pitch, motion, x, y, width, height);
488 
489  if (result != 0) {
490  av_dlog(avctx, "Error in svq1_motion_inter_4v_block %i\n", result);
491  break;
492  }
493  result = svq1_decode_block_non_intra(bitbuf, current, pitch);
494  break;
495 
496  case SVQ1_BLOCK_INTRA:
497  result = svq1_decode_block_intra(bitbuf, current, pitch);
498  break;
499  }
500 
501  return result;
502 }
503 
505 {
506  uint8_t seed;
507  int i;
508 
509  out[0] = get_bits(bitbuf, 8);
510  seed = string_table[out[0]];
511 
512  for (i = 1; i <= out[0]; i++) {
513  out[i] = get_bits(bitbuf, 8) ^ seed;
514  seed = string_table[out[i] ^ seed];
515  }
516 }
517 
519 {
520  SVQ1Context *s = avctx->priv_data;
521  GetBitContext *bitbuf = &s->gb;
522  int frame_size_code;
523 
524  skip_bits(bitbuf, 8); /* temporal_reference */
525 
526  /* frame type */
527  s->nonref = 0;
528  switch (get_bits(bitbuf, 2)) {
529  case 0:
530  frame->pict_type = AV_PICTURE_TYPE_I;
531  break;
532  case 2:
533  s->nonref = 1;
534  case 1:
535  frame->pict_type = AV_PICTURE_TYPE_P;
536  break;
537  default:
538  av_log(avctx, AV_LOG_ERROR, "Invalid frame type.\n");
539  return AVERROR_INVALIDDATA;
540  }
541 
542  if (frame->pict_type == AV_PICTURE_TYPE_I) {
543  /* unknown fields */
544  if (s->frame_code == 0x50 || s->frame_code == 0x60) {
545  int csum = get_bits(bitbuf, 16);
546 
547  csum = ff_svq1_packet_checksum(bitbuf->buffer,
548  bitbuf->size_in_bits >> 3,
549  csum);
550 
551  av_dlog(avctx, "%s checksum (%02x) for packet data\n",
552  (csum == 0) ? "correct" : "incorrect", csum);
553  }
554 
555  if ((s->frame_code ^ 0x10) >= 0x50) {
556  uint8_t msg[256];
557 
558  svq1_parse_string(bitbuf, msg);
559 
560  av_log(avctx, AV_LOG_INFO,
561  "embedded message: \"%s\"\n", (char *)msg);
562  }
563 
564  skip_bits(bitbuf, 2);
565  skip_bits(bitbuf, 2);
566  skip_bits1(bitbuf);
567 
568  /* load frame size */
569  frame_size_code = get_bits(bitbuf, 3);
570 
571  if (frame_size_code == 7) {
572  /* load width, height (12 bits each) */
573  s->width = get_bits(bitbuf, 12);
574  s->height = get_bits(bitbuf, 12);
575 
576  if (!s->width || !s->height)
577  return AVERROR_INVALIDDATA;
578  } else {
579  /* get width, height from table */
580  s->width = ff_svq1_frame_size_table[frame_size_code][0];
581  s->height = ff_svq1_frame_size_table[frame_size_code][1];
582  }
583  }
584 
585  /* unknown fields */
586  if (get_bits1(bitbuf) == 1) {
587  skip_bits1(bitbuf); /* use packet checksum if (1) */
588  skip_bits1(bitbuf); /* component checksums after image data if (1) */
589 
590  if (get_bits(bitbuf, 2) != 0)
591  return AVERROR_INVALIDDATA;
592  }
593 
594  if (get_bits1(bitbuf) == 1) {
595  skip_bits1(bitbuf);
596  skip_bits(bitbuf, 4);
597  skip_bits1(bitbuf);
598  skip_bits(bitbuf, 2);
599 
600  while (get_bits1(bitbuf) == 1)
601  skip_bits(bitbuf, 8);
602  }
603 
604  return 0;
605 }
606 
607 static int svq1_decode_frame(AVCodecContext *avctx, void *data,
608  int *got_frame, AVPacket *avpkt)
609 {
610  const uint8_t *buf = avpkt->data;
611  int buf_size = avpkt->size;
612  SVQ1Context *s = avctx->priv_data;
613  AVFrame *cur = data;
614  uint8_t *current;
615  int result, i, x, y, width, height;
616  svq1_pmv *pmv;
617 
618  /* initialize bit buffer */
619  init_get_bits(&s->gb, buf, buf_size * 8);
620 
621  /* decode frame header */
622  s->frame_code = get_bits(&s->gb, 22);
623 
624  if ((s->frame_code & ~0x70) || !(s->frame_code & 0x60))
625  return AVERROR_INVALIDDATA;
626 
627  /* swap some header bytes (why?) */
628  if (s->frame_code != 0x20) {
629  uint32_t *src = (uint32_t *)(buf + 4);
630 
631  for (i = 0; i < 4; i++)
632  src[i] = ((src[i] << 16) | (src[i] >> 16)) ^ src[7 - i];
633  }
634 
635  result = svq1_decode_frame_header(avctx, cur);
636 
637  if (result != 0) {
638  av_dlog(avctx, "Error in svq1_decode_frame_header %i\n", result);
639  return result;
640  }
641 
642  result = ff_set_dimensions(avctx, s->width, s->height);
643  if (result < 0)
644  return result;
645 
646  if ((avctx->skip_frame >= AVDISCARD_NONREF && s->nonref) ||
647  (avctx->skip_frame >= AVDISCARD_NONKEY &&
648  cur->pict_type != AV_PICTURE_TYPE_I) ||
649  avctx->skip_frame >= AVDISCARD_ALL)
650  return buf_size;
651 
652  result = ff_get_buffer(avctx, cur, s->nonref ? 0 : AV_GET_BUFFER_FLAG_REF);
653  if (result < 0)
654  return result;
655 
656  pmv = av_malloc((FFALIGN(s->width, 16) / 8 + 3) * sizeof(*pmv));
657  if (!pmv)
658  return AVERROR(ENOMEM);
659 
660  /* decode y, u and v components */
661  for (i = 0; i < 3; i++) {
662  int linesize = cur->linesize[i];
663  if (i == 0) {
664  width = FFALIGN(s->width, 16);
665  height = FFALIGN(s->height, 16);
666  } else {
667  if (avctx->flags & CODEC_FLAG_GRAY)
668  break;
669  width = FFALIGN(s->width / 4, 16);
670  height = FFALIGN(s->height / 4, 16);
671  }
672 
673  current = cur->data[i];
674 
675  if (cur->pict_type == AV_PICTURE_TYPE_I) {
676  /* keyframe */
677  for (y = 0; y < height; y += 16) {
678  for (x = 0; x < width; x += 16) {
679  result = svq1_decode_block_intra(&s->gb, &current[x],
680  linesize);
681  if (result != 0) {
682  av_log(avctx, AV_LOG_INFO,
683  "Error in svq1_decode_block %i (keyframe)\n",
684  result);
685  goto err;
686  }
687  }
688  current += 16 * linesize;
689  }
690  } else {
691  /* delta frame */
692  uint8_t *previous = s->prev->data[i];
693  if (!previous ||
694  s->prev->width != s->width || s->prev->height != s->height) {
695  av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n");
696  result = AVERROR_INVALIDDATA;
697  goto err;
698  }
699 
700  memset(pmv, 0, ((width / 8) + 3) * sizeof(svq1_pmv));
701 
702  for (y = 0; y < height; y += 16) {
703  for (x = 0; x < width; x += 16) {
704  result = svq1_decode_delta_block(avctx, &s->hdsp,
705  &s->gb, &current[x],
706  previous, linesize,
707  pmv, x, y, width, height);
708  if (result != 0) {
709  av_dlog(avctx,
710  "Error in svq1_decode_delta_block %i\n",
711  result);
712  goto err;
713  }
714  }
715 
716  pmv[0].x =
717  pmv[0].y = 0;
718 
719  current += 16 * linesize;
720  }
721  }
722  }
723 
724  if (!s->nonref) {
725  av_frame_unref(s->prev);
726  result = av_frame_ref(s->prev, cur);
727  if (result < 0)
728  goto err;
729  }
730 
731  *got_frame = 1;
732  result = buf_size;
733 
734 err:
735  av_free(pmv);
736  return result;
737 }
738 
740 {
741  SVQ1Context *s = avctx->priv_data;
742  int i;
743  int offset = 0;
744 
745  s->prev = av_frame_alloc();
746  if (!s->prev)
747  return AVERROR(ENOMEM);
748 
749  s->width = avctx->width + 3 & ~3;
750  s->height = avctx->height + 3 & ~3;
751  avctx->pix_fmt = AV_PIX_FMT_YUV410P;
752 
753  ff_hpeldsp_init(&s->hdsp, avctx->flags);
754 
755  INIT_VLC_STATIC(&svq1_block_type, 2, 4,
756  &ff_svq1_block_type_vlc[0][1], 2, 1,
757  &ff_svq1_block_type_vlc[0][0], 2, 1, 6);
758 
759  INIT_VLC_STATIC(&svq1_motion_component, 7, 33,
760  &ff_mvtab[0][1], 2, 1,
761  &ff_mvtab[0][0], 2, 1, 176);
762 
763  for (i = 0; i < 6; i++) {
764  static const uint8_t sizes[2][6] = { { 14, 10, 14, 18, 16, 18 },
765  { 10, 10, 14, 14, 14, 16 } };
766  static VLC_TYPE table[168][2];
767  svq1_intra_multistage[i].table = &table[offset];
768  svq1_intra_multistage[i].table_allocated = sizes[0][i];
769  offset += sizes[0][i];
770  init_vlc(&svq1_intra_multistage[i], 3, 8,
771  &ff_svq1_intra_multistage_vlc[i][0][1], 2, 1,
772  &ff_svq1_intra_multistage_vlc[i][0][0], 2, 1,
774  svq1_inter_multistage[i].table = &table[offset];
775  svq1_inter_multistage[i].table_allocated = sizes[1][i];
776  offset += sizes[1][i];
777  init_vlc(&svq1_inter_multistage[i], 3, 8,
778  &ff_svq1_inter_multistage_vlc[i][0][1], 2, 1,
779  &ff_svq1_inter_multistage_vlc[i][0][0], 2, 1,
781  }
782 
783  INIT_VLC_STATIC(&svq1_intra_mean, 8, 256,
784  &ff_svq1_intra_mean_vlc[0][1], 4, 2,
785  &ff_svq1_intra_mean_vlc[0][0], 4, 2, 632);
786 
787  INIT_VLC_STATIC(&svq1_inter_mean, 9, 512,
788  &ff_svq1_inter_mean_vlc[0][1], 4, 2,
789  &ff_svq1_inter_mean_vlc[0][0], 4, 2, 1434);
790 
791  return 0;
792 }
793 
795 {
796  SVQ1Context *s = avctx->priv_data;
797 
798  av_frame_free(&s->prev);
799 
800  return 0;
801 }
802 
803 static void svq1_flush(AVCodecContext *avctx)
804 {
805  SVQ1Context *s = avctx->priv_data;
806 
807  av_frame_unref(s->prev);
808 }
809 
811  .name = "svq1",
812  .long_name = NULL_IF_CONFIG_SMALL("Sorenson Vector Quantizer 1 / Sorenson Video 1 / SVQ1"),
813  .type = AVMEDIA_TYPE_VIDEO,
814  .id = AV_CODEC_ID_SVQ1,
815  .priv_data_size = sizeof(SVQ1Context),
819  .capabilities = CODEC_CAP_DR1,
820  .flush = svq1_flush,
821  .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV410P,
822  AV_PIX_FMT_NONE },
823 };
void * av_malloc(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:62
discard all frames except keyframes
Definition: avcodec.h:545
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:54
static VLC svq1_inter_multistage[6]
Definition: svq1dec.c:49
This structure describes decoded (raw) audio or video data.
Definition: frame.h:107
static int svq1_motion_inter_4v_block(HpelDSPContext *hdsp, GetBitContext *bitbuf, uint8_t *current, uint8_t *previous, int pitch, svq1_pmv *motion, int x, int y, int width, int height)
Definition: svq1dec.c:366
static VLC svq1_motion_component
Definition: svq1dec.c:47
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:240
uint16_t ff_svq1_packet_checksum(const uint8_t *data, const int length, int value)
Definition: svq13.c:60
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:144
int size
Definition: avcodec.h:974
const uint8_t * buffer
Definition: get_bits.h:54
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1247
#define VLC_TYPE
Definition: get_bits.h:62
av_dlog(ac->avr,"%d samples - audio_convert: %s to %s (%s)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt), use_generic?ac->func_descr_generic:ac->func_descr)
discard all
Definition: avcodec.h:546
#define SVQ1_BLOCK_INTRA
Definition: svq1.h:43
AVCodec.
Definition: avcodec.h:2755
#define FFALIGN(x, a)
Definition: common.h:62
enum AVDiscard skip_frame
Definition: avcodec.h:2701
const uint16_t ff_svq1_frame_size_table[7][2]
Definition: svq1.c:40
#define SVQ1_BLOCK_SKIP
Definition: svq1.h:40
static av_cold int svq1_decode_end(AVCodecContext *avctx)
Definition: svq1dec.c:794
static int decode(MimicContext *ctx, int quality, int num_coeffs, int is_iframe)
Definition: mimic.c:269
uint8_t
#define av_cold
Definition: attributes.h:66
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:43
static VLC svq1_intra_mean
Definition: svq1dec.c:50
const int8_t *const ff_svq1_inter_codebooks[6]
Definition: svq1_cb.h:776
#define INIT_VLC_STATIC(vlc, bits, a, b, c, d, e, f, g, static_size)
Definition: get_bits.h:443
static VLC svq1_intra_multistage[6]
Definition: svq1dec.c:48
const uint8_t ff_mvtab[33][2]
Definition: h263data.h:91
int av_frame_ref(AVFrame *dst, const AVFrame *src)
Set up a new reference to the data described by the source frame.
Definition: frame.c:174
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(constint16_t *) pi >>8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(constint32_t *) pi >>24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(constfloat *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(constfloat *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(constfloat *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(constdouble *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(constdouble *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(constdouble *) pi *(1U<< 31))))#defineSET_CONV_FUNC_GROUP(ofmt, ifmt) staticvoidset_generic_function(AudioConvert *ac){}voidff_audio_convert_free(AudioConvert **ac){if(!*ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);}AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enumAVSampleFormatout_fmt, enumAVSampleFormatin_fmt, intchannels, intsample_rate, intapply_map){AudioConvert *ac;intin_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) returnNULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method!=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt)>2){ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc){av_free(ac);returnNULL;}returnac;}in_planar=av_sample_fmt_is_planar(in_fmt);out_planar=av_sample_fmt_is_planar(out_fmt);if(in_planar==out_planar){ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar?ac->channels:1;}elseif(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;elseac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);returnac;}intff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in){intuse_generic=1;intlen=in->nb_samples;intp;if(ac->dc){av_dlog(ac->avr,"%dsamples-audio_convert:%sto%s(dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));returnff_convert_dither(ac-> out
#define CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:711
const char data[16]
Definition: mxf.c:66
uint8_t * data
Definition: avcodec.h:973
bitstream reader API header.
#define SVQ1_ADD_CODEBOOK()
Definition: svq1dec.c:121
static int svq1_decode_frame_header(AVCodecContext *avctx, AVFrame *frame)
Definition: svq1dec.c:518
int width
width and height of the video frame
Definition: frame.h:146
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:123
void av_free(void *ptr)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc(). ...
Definition: mem.c:186
static const int sizes[][2]
Definition: img2dec.c:46
#define AVERROR(e)
Definition: error.h:43
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:55
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:142
#define SVQ1_CALC_CODEBOOK_ENTRIES(cbook)
Definition: svq1dec.c:144
int flags
CODEC_FLAG_*.
Definition: avcodec.h:1142
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:148
const char * name
Name of the codec implementation.
Definition: avcodec.h:2762
#define SVQ1_BLOCK_INTER
Definition: svq1.h:41
static void svq1_skip_block(uint8_t *current, uint8_t *previous, int pitch, int x, int y)
Definition: svq1dec.c:305
Sorenson Vector Quantizer #1 (SVQ1) video codec.
Definition: get_bits.h:64
av_cold void ff_hpeldsp_init(HpelDSPContext *c, int flags)
Definition: hpeldsp.c:37
Half-pel DSP context.
Definition: hpeldsp.h:45
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:168
static int svq1_decode_block_intra(GetBitContext *bitbuf, uint8_t *pixels, int pitch)
Definition: svq1dec.c:156
static void svq1_parse_string(GetBitContext *bitbuf, uint8_t *out)
Definition: svq1dec.c:504
int width
Definition: svq1dec.c:63
const uint8_t ff_svq1_block_type_vlc[4][2]
Definition: svq1_vlc.h:27
int width
picture width / height.
Definition: avcodec.h:1217
HpelDSPContext hdsp
Definition: svq1dec.c:60
int size_in_bits
Definition: get_bits.h:56
static av_always_inline int get_vlc2(GetBitContext *s, VLC_TYPE(*table)[2], int bits, int max_depth)
Parse a vlc code.
Definition: get_bits.h:522
static void svq1_flush(AVCodecContext *avctx)
Definition: svq1dec.c:803
#define INIT_VLC_USE_NEW_STATIC
Definition: get_bits.h:441
const uint8_t ff_svq1_inter_multistage_vlc[6][8][2]
Definition: svq1_vlc.h:50
static int svq1_decode_delta_block(AVCodecContext *avctx, HpelDSPContext *hdsp, GetBitContext *bitbuf, uint8_t *current, uint8_t *previous, int pitch, svq1_pmv *motion, int x, int y, int width, int height)
Definition: svq1dec.c:447
int table_allocated
Definition: get_bits.h:67
static const int8_t mv[256][2]
Definition: 4xm.c:72
NULL
Definition: eval.c:55
Half-pel DSP functions.
static int width
Definition: utils.c:156
#define AV_LOG_INFO
Standard information.
Definition: log.h:134
Libavcodec external API header.
AVFrame * prev
Definition: svq1dec.c:62
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:125
main external API structure.
Definition: avcodec.h:1054
static void close(AVCodecParserContext *s)
Definition: h264_parser.c:489
static unsigned int seed
Definition: videogen.c:78
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: utils.c:575
#define init_vlc(vlc, nb_bits, nb_codes,bits, bits_wrap, bits_size,codes, codes_wrap, codes_size,flags)
Definition: get_bits.h:424
op_pixels_func put_pixels_tab[4][4]
Halfpel motion compensation with rounding (a+b+1)>>1.
Definition: hpeldsp.h:56
static VLC svq1_inter_mean
Definition: svq1dec.c:51
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:271
static void skip_bits1(GetBitContext *s)
Definition: get_bits.h:296
planar YUV 4:1:0, 9bpp, (1 Cr & Cb sample per 4x4 Y samples)
Definition: pixfmt.h:71
static int svq1_motion_inter_block(HpelDSPContext *hdsp, GetBitContext *bitbuf, uint8_t *current, uint8_t *previous, int pitch, svq1_pmv *motion, int x, int y, int width, int height)
Definition: svq1dec.c:322
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:263
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:375
GetBitContext gb
Definition: svq1dec.c:61
#define mid_pred
Definition: mathops.h:94
static int svq1_decode_block_non_intra(GetBitContext *bitbuf, uint8_t *pixels, int pitch)
Definition: svq1dec.c:221
static av_const int sign_extend(int val, unsigned bits)
Definition: mathops.h:123
int height
Definition: svq1dec.c:64
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
Definition: frame.c:273
#define SVQ1_BLOCK_INTER_4V
Definition: svq1.h:42
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:113
uint8_t level
Definition: svq3.c:143
int height
Definition: gxfenc.c:72
discard all non reference
Definition: avcodec.h:543
static int svq1_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: svq1dec.c:607
const int8_t *const ff_svq1_intra_codebooks[6]
Definition: svq1_cb.h:1519
common internal api header.
#define CODEC_FLAG_GRAY
Only decode/encode grayscale.
Definition: avcodec.h:670
const uint8_t ff_svq1_intra_multistage_vlc[6][8][2]
Definition: svq1_vlc.h:33
static av_cold void flush(AVCodecContext *avctx)
Flush (reset) the frame ID after seeking.
Definition: alsdec.c:1766
int frame_code
Definition: svq1dec.c:65
static const uint8_t string_table[256]
Definition: svq1dec.c:69
static int svq1_decode_motion_vector(GetBitContext *bitbuf, svq1_pmv *mv, svq1_pmv **pmv)
Definition: svq1dec.c:279
const uint16_t ff_svq1_inter_mean_vlc[512][2]
Definition: svq1_vlc.h:136
static av_cold int init(AVCodecParserContext *s)
Definition: h264_parser.c:498
int y
Definition: svq1dec.c:56
void * priv_data
Definition: avcodec.h:1090
#define SVQ1_PROCESS_VECTOR()
Definition: svq1dec.c:104
int nonref
Definition: svq1dec.c:66
VLC_TYPE(* table)[2]
code, bits
Definition: get_bits.h:66
static av_cold int svq1_decode_init(AVCodecContext *avctx)
Definition: svq1dec.c:739
int height
Definition: frame.h:146
static VLC svq1_block_type
Definition: svq1dec.c:46
AVCodec ff_svq1_decoder
Definition: svq1dec.c:810
AVPixelFormat
Pixel format.
Definition: pixfmt.h:63
This structure stores compressed data.
Definition: avcodec.h:950
const uint16_t ff_svq1_intra_mean_vlc[256][2]
Definition: svq1_vlc.h:67
#define AV_GET_BUFFER_FLAG_REF
The decoder will keep a reference to the frame and may reuse it later.
Definition: avcodec.h:877
Predicted.
Definition: avutil.h:254
int x
Definition: svq1dec.c:55