FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
svq1dec.c
Go to the documentation of this file.
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 FFmpeg.
12  *
13  * FFmpeg 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  * FFmpeg 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 FFmpeg; if not, write to the Free Software
25  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
26  */
27 
28 /**
29  * @file
30  * Sorenson Vector Quantizer #1 (SVQ1) video codec.
31  * For more information of the SVQ1 algorithm, visit:
32  * http://www.pcisys.net/~melanson/codecs/
33  */
34 
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 
49 
50 /* motion vector (prediction) */
51 typedef struct svq1_pmv_s {
52  int x;
53  int y;
54 } svq1_pmv;
55 
56 typedef struct SVQ1Context {
60 
63 
64  int width;
65  int height;
67  int nonref; // 1 if the current frame won't be referenced
68 } SVQ1Context;
69 
70 static const uint8_t string_table[256] = {
71  0x00, 0xD5, 0x7F, 0xAA, 0xFE, 0x2B, 0x81, 0x54,
72  0x29, 0xFC, 0x56, 0x83, 0xD7, 0x02, 0xA8, 0x7D,
73  0x52, 0x87, 0x2D, 0xF8, 0xAC, 0x79, 0xD3, 0x06,
74  0x7B, 0xAE, 0x04, 0xD1, 0x85, 0x50, 0xFA, 0x2F,
75  0xA4, 0x71, 0xDB, 0x0E, 0x5A, 0x8F, 0x25, 0xF0,
76  0x8D, 0x58, 0xF2, 0x27, 0x73, 0xA6, 0x0C, 0xD9,
77  0xF6, 0x23, 0x89, 0x5C, 0x08, 0xDD, 0x77, 0xA2,
78  0xDF, 0x0A, 0xA0, 0x75, 0x21, 0xF4, 0x5E, 0x8B,
79  0x9D, 0x48, 0xE2, 0x37, 0x63, 0xB6, 0x1C, 0xC9,
80  0xB4, 0x61, 0xCB, 0x1E, 0x4A, 0x9F, 0x35, 0xE0,
81  0xCF, 0x1A, 0xB0, 0x65, 0x31, 0xE4, 0x4E, 0x9B,
82  0xE6, 0x33, 0x99, 0x4C, 0x18, 0xCD, 0x67, 0xB2,
83  0x39, 0xEC, 0x46, 0x93, 0xC7, 0x12, 0xB8, 0x6D,
84  0x10, 0xC5, 0x6F, 0xBA, 0xEE, 0x3B, 0x91, 0x44,
85  0x6B, 0xBE, 0x14, 0xC1, 0x95, 0x40, 0xEA, 0x3F,
86  0x42, 0x97, 0x3D, 0xE8, 0xBC, 0x69, 0xC3, 0x16,
87  0xEF, 0x3A, 0x90, 0x45, 0x11, 0xC4, 0x6E, 0xBB,
88  0xC6, 0x13, 0xB9, 0x6C, 0x38, 0xED, 0x47, 0x92,
89  0xBD, 0x68, 0xC2, 0x17, 0x43, 0x96, 0x3C, 0xE9,
90  0x94, 0x41, 0xEB, 0x3E, 0x6A, 0xBF, 0x15, 0xC0,
91  0x4B, 0x9E, 0x34, 0xE1, 0xB5, 0x60, 0xCA, 0x1F,
92  0x62, 0xB7, 0x1D, 0xC8, 0x9C, 0x49, 0xE3, 0x36,
93  0x19, 0xCC, 0x66, 0xB3, 0xE7, 0x32, 0x98, 0x4D,
94  0x30, 0xE5, 0x4F, 0x9A, 0xCE, 0x1B, 0xB1, 0x64,
95  0x72, 0xA7, 0x0D, 0xD8, 0x8C, 0x59, 0xF3, 0x26,
96  0x5B, 0x8E, 0x24, 0xF1, 0xA5, 0x70, 0xDA, 0x0F,
97  0x20, 0xF5, 0x5F, 0x8A, 0xDE, 0x0B, 0xA1, 0x74,
98  0x09, 0xDC, 0x76, 0xA3, 0xF7, 0x22, 0x88, 0x5D,
99  0xD6, 0x03, 0xA9, 0x7C, 0x28, 0xFD, 0x57, 0x82,
100  0xFF, 0x2A, 0x80, 0x55, 0x01, 0xD4, 0x7E, 0xAB,
101  0x84, 0x51, 0xFB, 0x2E, 0x7A, 0xAF, 0x05, 0xD0,
102  0xAD, 0x78, 0xD2, 0x07, 0x53, 0x86, 0x2C, 0xF9
103 };
104 
105 #define SVQ1_PROCESS_VECTOR() \
106  for (; level > 0; i++) { \
107  /* process next depth */ \
108  if (i == m) { \
109  m = n; \
110  if (--level == 0) \
111  break; \
112  } \
113  /* divide block if next bit set */ \
114  if (!get_bits1(bitbuf)) \
115  break; \
116  /* add child nodes */ \
117  list[n++] = list[i]; \
118  list[n++] = list[i] + (((level & 1) ? pitch : 1) << ((level >> 1) + 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 << 16) + mean;
155 
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 stages;
166  unsigned mean;
167  unsigned x, y, width, height, level;
168  uint32_t n1, n2, n3, n4;
169 
170  /* initialize list for breadth first processing of vectors */
171  list[0] = pixels;
172 
173  /* recursively process vector */
174  for (i = 0, m = 1, n = 1, level = 5; i < n; i++) {
176 
177  /* destination address and vector size */
178  dst = (uint32_t *)list[i];
179  width = 1 << ((4 + level) / 2);
180  height = 1 << ((3 + level) / 2);
181 
182  /* get number of stages (-1 skips vector, 0 for mean only) */
183  stages = get_vlc2(bitbuf, svq1_intra_multistage[level].table, 3, 3) - 1;
184 
185  if (stages == -1) {
186  for (y = 0; y < height; y++)
187  memset(&dst[y * (pitch / 4)], 0, width);
188  continue; /* skip vector */
189  }
190 
191  if ((stages > 0 && level >= 4)) {
192  ff_dlog(NULL,
193  "Error (svq1_decode_block_intra): invalid vector: stages=%i level=%i\n",
194  stages, level);
195  return AVERROR_INVALIDDATA; /* invalid vector */
196  }
197  av_assert0(stages >= 0);
198 
199  mean = get_vlc2(bitbuf, svq1_intra_mean.table, 8, 3);
200 
201  if (stages == 0) {
202  for (y = 0; y < height; y++)
203  memset(&dst[y * (pitch / 4)], mean, width);
204  } else {
206 
207  for (y = 0; y < height; y++) {
208  for (x = 0; x < width / 4; x++, codebook++) {
209  n1 = n4;
210  n2 = n4;
212  /* store result */
213  dst[x] = n1 << 8 | n2;
214  }
215  dst += pitch / 4;
216  }
217  }
218  }
219 
220  return 0;
221 }
222 
224  int pitch)
225 {
226  uint32_t bit_cache;
227  uint8_t *list[63];
228  uint32_t *dst;
229  const uint32_t *codebook;
230  int entries[6];
231  int i, j, m, n;
232  int stages;
233  unsigned mean;
234  int x, y, width, height, level;
235  uint32_t n1, n2, n3, n4;
236 
237  /* initialize list for breadth first processing of vectors */
238  list[0] = pixels;
239 
240  /* recursively process vector */
241  for (i = 0, m = 1, n = 1, level = 5; i < n; i++) {
243 
244  /* destination address and vector size */
245  dst = (uint32_t *)list[i];
246  width = 1 << ((4 + level) / 2);
247  height = 1 << ((3 + level) / 2);
248 
249  /* get number of stages (-1 skips vector, 0 for mean only) */
250  stages = get_vlc2(bitbuf, svq1_inter_multistage[level].table, 3, 2) - 1;
251 
252  if (stages == -1)
253  continue; /* skip vector */
254 
255  if ((stages > 0 && level >= 4)) {
256  ff_dlog(NULL,
257  "Error (svq1_decode_block_non_intra): invalid vector: stages=%i level=%i\n",
258  stages, level);
259  return AVERROR_INVALIDDATA; /* invalid vector */
260  }
261  av_assert0(stages >= 0);
262 
263  mean = get_vlc2(bitbuf, svq1_inter_mean.table, 9, 3) - 256;
264 
266 
267  for (y = 0; y < height; y++) {
268  for (x = 0; x < width / 4; x++, codebook++) {
269  n3 = dst[x];
270  /* add mean value to vector */
271  n1 = n4 + ((n3 & 0xFF00FF00) >> 8);
272  n2 = n4 + (n3 & 0x00FF00FF);
274  /* store result */
275  dst[x] = n1 << 8 | n2;
276  }
277  dst += pitch / 4;
278  }
279  }
280  return 0;
281 }
282 
284  svq1_pmv **pmv)
285 {
286  int diff;
287  int i;
288 
289  for (i = 0; i < 2; i++) {
290  /* get motion code */
291  diff = get_vlc2(bitbuf, svq1_motion_component.table, 7, 2);
292  if (diff < 0)
293  return AVERROR_INVALIDDATA;
294  else if (diff) {
295  if (get_bits1(bitbuf))
296  diff = -diff;
297  }
298 
299  /* add median of motion vector predictors and clip result */
300  if (i == 1)
301  mv->y = sign_extend(diff + mid_pred(pmv[0]->y, pmv[1]->y, pmv[2]->y), 6);
302  else
303  mv->x = sign_extend(diff + mid_pred(pmv[0]->x, pmv[1]->x, pmv[2]->x), 6);
304  }
305 
306  return 0;
307 }
308 
309 static void svq1_skip_block(uint8_t *current, uint8_t *previous,
310  int pitch, int x, int y)
311 {
312  uint8_t *src;
313  uint8_t *dst;
314  int i;
315 
316  src = &previous[x + y * pitch];
317  dst = current;
318 
319  for (i = 0; i < 16; i++) {
320  memcpy(dst, src, 16);
321  src += pitch;
322  dst += pitch;
323  }
324 }
325 
327  uint8_t *current, uint8_t *previous,
328  int pitch, svq1_pmv *motion, int x, int y,
329  int width, int height)
330 {
331  uint8_t *src;
332  uint8_t *dst;
333  svq1_pmv mv;
334  svq1_pmv *pmv[3];
335  int result;
336 
337  /* predict and decode motion vector */
338  pmv[0] = &motion[0];
339  if (y == 0) {
340  pmv[1] =
341  pmv[2] = pmv[0];
342  } else {
343  pmv[1] = &motion[x / 8 + 2];
344  pmv[2] = &motion[x / 8 + 4];
345  }
346 
347  result = svq1_decode_motion_vector(bitbuf, &mv, pmv);
348  if (result)
349  return result;
350 
351  motion[0].x =
352  motion[x / 8 + 2].x =
353  motion[x / 8 + 3].x = mv.x;
354  motion[0].y =
355  motion[x / 8 + 2].y =
356  motion[x / 8 + 3].y = mv.y;
357 
358  mv.x = av_clip(mv.x, -2 * x, 2 * (width - x - 16));
359  mv.y = av_clip(mv.y, -2 * y, 2 * (height - y - 16));
360 
361  src = &previous[(x + (mv.x >> 1)) + (y + (mv.y >> 1)) * pitch];
362  dst = current;
363 
364  hdsp->put_pixels_tab[0][(mv.y & 1) << 1 | (mv.x & 1)](dst, src, pitch, 16);
365 
366  return 0;
367 }
368 
370  uint8_t *current, uint8_t *previous,
371  int pitch, svq1_pmv *motion, int x, int y,
372  int width, int height)
373 {
374  uint8_t *src;
375  uint8_t *dst;
376  svq1_pmv mv;
377  svq1_pmv *pmv[4];
378  int i, result;
379 
380  /* predict and decode motion vector (0) */
381  pmv[0] = &motion[0];
382  if (y == 0) {
383  pmv[1] =
384  pmv[2] = pmv[0];
385  } else {
386  pmv[1] = &motion[(x / 8) + 2];
387  pmv[2] = &motion[(x / 8) + 4];
388  }
389 
390  result = svq1_decode_motion_vector(bitbuf, &mv, pmv);
391  if (result)
392  return result;
393 
394  /* predict and decode motion vector (1) */
395  pmv[0] = &mv;
396  if (y == 0) {
397  pmv[1] =
398  pmv[2] = pmv[0];
399  } else {
400  pmv[1] = &motion[(x / 8) + 3];
401  }
402  result = svq1_decode_motion_vector(bitbuf, &motion[0], pmv);
403  if (result)
404  return result;
405 
406  /* predict and decode motion vector (2) */
407  pmv[1] = &motion[0];
408  pmv[2] = &motion[(x / 8) + 1];
409 
410  result = svq1_decode_motion_vector(bitbuf, &motion[(x / 8) + 2], pmv);
411  if (result)
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  if (result)
420  return result;
421 
422  /* form predictions */
423  for (i = 0; i < 4; i++) {
424  int mvx = pmv[i]->x + (i & 1) * 16;
425  int mvy = pmv[i]->y + (i >> 1) * 16;
426 
427  // FIXME: clipping or padding?
428  mvx = av_clip(mvx, -2 * x, 2 * (width - x - 8));
429  mvy = av_clip(mvy, -2 * y, 2 * (height - y - 8));
430 
431  src = &previous[(x + (mvx >> 1)) + (y + (mvy >> 1)) * pitch];
432  dst = current;
433 
434  hdsp->put_pixels_tab[1][((mvy & 1) << 1) | (mvx & 1)](dst, src, pitch, 8);
435 
436  /* select next block */
437  if (i & 1)
438  current += 8 * (pitch - 1);
439  else
440  current += 8;
441  }
442 
443  return 0;
444 }
445 
447  GetBitContext *bitbuf,
448  uint8_t *current, uint8_t *previous,
449  int pitch, svq1_pmv *motion, int x, int y,
450  int width, int height)
451 {
452  uint32_t block_type;
453  int result = 0;
454 
455  /* get block type */
456  block_type = get_vlc2(bitbuf, svq1_block_type.table, 2, 2);
457 
458  /* reset motion vectors */
459  if (block_type == SVQ1_BLOCK_SKIP || block_type == SVQ1_BLOCK_INTRA) {
460  motion[0].x =
461  motion[0].y =
462  motion[x / 8 + 2].x =
463  motion[x / 8 + 2].y =
464  motion[x / 8 + 3].x =
465  motion[x / 8 + 3].y = 0;
466  }
467 
468  switch (block_type) {
469  case SVQ1_BLOCK_SKIP:
470  svq1_skip_block(current, previous, pitch, x, y);
471  break;
472 
473  case SVQ1_BLOCK_INTER:
474  result = svq1_motion_inter_block(hdsp, bitbuf, current, previous,
475  pitch, motion, x, y, width, height);
476 
477  if (result != 0) {
478  ff_dlog(avctx, "Error in svq1_motion_inter_block %i\n", result);
479  break;
480  }
481  result = svq1_decode_block_non_intra(bitbuf, current, pitch);
482  break;
483 
484  case SVQ1_BLOCK_INTER_4V:
485  result = svq1_motion_inter_4v_block(hdsp, bitbuf, current, previous,
486  pitch, motion, x, y, width, height);
487 
488  if (result != 0) {
489  ff_dlog(avctx, "Error in svq1_motion_inter_4v_block %i\n", result);
490  break;
491  }
492  result = svq1_decode_block_non_intra(bitbuf, current, pitch);
493  break;
494 
495  case SVQ1_BLOCK_INTRA:
496  result = svq1_decode_block_intra(bitbuf, current, pitch);
497  break;
498  }
499 
500  return result;
501 }
502 
503 static void svq1_parse_string(GetBitContext *bitbuf, uint8_t out[257])
504 {
505  uint8_t seed;
506  int i;
507 
508  out[0] = get_bits(bitbuf, 8);
509  seed = string_table[out[0]];
510 
511  for (i = 1; i <= out[0]; i++) {
512  out[i] = get_bits(bitbuf, 8) ^ seed;
513  seed = string_table[out[i] ^ seed];
514  }
515  out[i] = 0;
516 }
517 
519 {
520  SVQ1Context *s = avctx->priv_data;
521  GetBitContext *bitbuf = &s->gb;
522  int frame_size_code;
523  int width = s->width;
524  int height = s->height;
525 
526  skip_bits(bitbuf, 8); /* temporal_reference */
527 
528  /* frame type */
529  s->nonref = 0;
530  switch (get_bits(bitbuf, 2)) {
531  case 0:
532  frame->pict_type = AV_PICTURE_TYPE_I;
533  break;
534  case 2:
535  s->nonref = 1;
536  case 1:
537  frame->pict_type = AV_PICTURE_TYPE_P;
538  break;
539  default:
540  av_log(avctx, AV_LOG_ERROR, "Invalid frame type.\n");
541  return AVERROR_INVALIDDATA;
542  }
543 
544  if (frame->pict_type == AV_PICTURE_TYPE_I) {
545  /* unknown fields */
546  if (s->frame_code == 0x50 || s->frame_code == 0x60) {
547  int csum = get_bits(bitbuf, 16);
548 
549  csum = ff_svq1_packet_checksum(bitbuf->buffer,
550  bitbuf->size_in_bits >> 3,
551  csum);
552 
553  ff_dlog(avctx, "%s checksum (%02x) for packet data\n",
554  (csum == 0) ? "correct" : "incorrect", csum);
555  }
556 
557  if ((s->frame_code ^ 0x10) >= 0x50) {
558  uint8_t msg[257];
559 
560  svq1_parse_string(bitbuf, msg);
561 
562  av_log(avctx, AV_LOG_INFO,
563  "embedded message:\n%s\n", ((char *)msg) + 1);
564  }
565 
566  skip_bits(bitbuf, 2);
567  skip_bits(bitbuf, 2);
568  skip_bits1(bitbuf);
569 
570  /* load frame size */
571  frame_size_code = get_bits(bitbuf, 3);
572 
573  if (frame_size_code == 7) {
574  /* load width, height (12 bits each) */
575  width = get_bits(bitbuf, 12);
576  height = get_bits(bitbuf, 12);
577 
578  if (!width || !height)
579  return AVERROR_INVALIDDATA;
580  } else {
581  /* get width, height from table */
582  width = ff_svq1_frame_size_table[frame_size_code][0];
583  height = ff_svq1_frame_size_table[frame_size_code][1];
584  }
585  }
586 
587  /* unknown fields */
588  if (get_bits1(bitbuf)) {
589  skip_bits1(bitbuf); /* use packet checksum if (1) */
590  skip_bits1(bitbuf); /* component checksums after image data if (1) */
591 
592  if (get_bits(bitbuf, 2) != 0)
593  return AVERROR_INVALIDDATA;
594  }
595 
596  if (get_bits1(bitbuf)) {
597  skip_bits1(bitbuf);
598  skip_bits(bitbuf, 4);
599  skip_bits1(bitbuf);
600  skip_bits(bitbuf, 2);
601 
602  if (skip_1stop_8data_bits(bitbuf) < 0)
603  return AVERROR_INVALIDDATA;
604  }
605 
606  s->width = width;
607  s->height = height;
608  return 0;
609 }
610 
611 static int svq1_decode_frame(AVCodecContext *avctx, void *data,
612  int *got_frame, AVPacket *avpkt)
613 {
614  const uint8_t *buf = avpkt->data;
615  int buf_size = avpkt->size;
616  SVQ1Context *s = avctx->priv_data;
617  AVFrame *cur = data;
618  uint8_t *current;
619  int result, i, x, y, width, height;
620  svq1_pmv *pmv;
621 
622  /* initialize bit buffer */
623  init_get_bits8(&s->gb, buf, buf_size);
624 
625  /* decode frame header */
626  s->frame_code = get_bits(&s->gb, 22);
627 
628  if ((s->frame_code & ~0x70) || !(s->frame_code & 0x60))
629  return AVERROR_INVALIDDATA;
630 
631  /* swap some header bytes (why?) */
632  if (s->frame_code != 0x20) {
633  uint32_t *src;
634 
635  if (buf_size < 9 * 4) {
636  av_log(avctx, AV_LOG_ERROR, "Input packet too small\n");
637  return AVERROR_INVALIDDATA;
638  }
639 
642  buf_size);
643  if (!s->pkt_swapped)
644  return AVERROR(ENOMEM);
645 
646  memcpy(s->pkt_swapped, buf, buf_size);
647  buf = s->pkt_swapped;
648  init_get_bits(&s->gb, buf, buf_size * 8);
649  skip_bits(&s->gb, 22);
650 
651  src = (uint32_t *)(s->pkt_swapped + 4);
652 
653  for (i = 0; i < 4; i++)
654  src[i] = ((src[i] << 16) | (src[i] >> 16)) ^ src[7 - i];
655  }
656 
657  result = svq1_decode_frame_header(avctx, cur);
658  if (result != 0) {
659  ff_dlog(avctx, "Error in svq1_decode_frame_header %i\n", result);
660  return result;
661  }
662 
663  result = ff_set_dimensions(avctx, s->width, s->height);
664  if (result < 0)
665  return result;
666 
667  if ((avctx->skip_frame >= AVDISCARD_NONREF && s->nonref) ||
668  (avctx->skip_frame >= AVDISCARD_NONKEY &&
669  cur->pict_type != AV_PICTURE_TYPE_I) ||
670  avctx->skip_frame >= AVDISCARD_ALL)
671  return buf_size;
672 
673  result = ff_get_buffer(avctx, cur, s->nonref ? 0 : AV_GET_BUFFER_FLAG_REF);
674  if (result < 0)
675  return result;
676 
677  pmv = av_malloc((FFALIGN(s->width, 16) / 8 + 3) * sizeof(*pmv));
678  if (!pmv)
679  return AVERROR(ENOMEM);
680 
681  /* decode y, u and v components */
682  for (i = 0; i < 3; i++) {
683  int linesize = cur->linesize[i];
684  if (i == 0) {
685  width = FFALIGN(s->width, 16);
686  height = FFALIGN(s->height, 16);
687  } else {
688  if (avctx->flags & AV_CODEC_FLAG_GRAY)
689  break;
690  width = FFALIGN(s->width / 4, 16);
691  height = FFALIGN(s->height / 4, 16);
692  }
693 
694  current = cur->data[i];
695 
696  if (cur->pict_type == AV_PICTURE_TYPE_I) {
697  /* keyframe */
698  for (y = 0; y < height; y += 16) {
699  for (x = 0; x < width; x += 16) {
700  result = svq1_decode_block_intra(&s->gb, &current[x],
701  linesize);
702  if (result) {
703  av_log(avctx, AV_LOG_ERROR,
704  "Error in svq1_decode_block %i (keyframe)\n",
705  result);
706  goto err;
707  }
708  }
709  current += 16 * linesize;
710  }
711  } else {
712  /* delta frame */
713  uint8_t *previous = s->prev->data[i];
714  if (!previous ||
715  s->prev->width != s->width || s->prev->height != s->height) {
716  av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n");
717  result = AVERROR_INVALIDDATA;
718  goto err;
719  }
720 
721  memset(pmv, 0, ((width / 8) + 3) * sizeof(svq1_pmv));
722 
723  for (y = 0; y < height; y += 16) {
724  for (x = 0; x < width; x += 16) {
725  result = svq1_decode_delta_block(avctx, &s->hdsp,
726  &s->gb, &current[x],
727  previous, linesize,
728  pmv, x, y, width, height);
729  if (result != 0) {
730  ff_dlog(avctx,
731  "Error in svq1_decode_delta_block %i\n",
732  result);
733  goto err;
734  }
735  }
736 
737  pmv[0].x =
738  pmv[0].y = 0;
739 
740  current += 16 * linesize;
741  }
742  }
743  }
744 
745  if (!s->nonref) {
746  av_frame_unref(s->prev);
747  result = av_frame_ref(s->prev, cur);
748  if (result < 0)
749  goto err;
750  }
751 
752  *got_frame = 1;
753  result = buf_size;
754 
755 err:
756  av_free(pmv);
757  return result;
758 }
759 
761 {
762  SVQ1Context *s = avctx->priv_data;
763  int i;
764  int offset = 0;
765 
766  s->prev = av_frame_alloc();
767  if (!s->prev)
768  return AVERROR(ENOMEM);
769 
770  s->width = avctx->width + 3 & ~3;
771  s->height = avctx->height + 3 & ~3;
772  avctx->pix_fmt = AV_PIX_FMT_YUV410P;
773 
774  ff_hpeldsp_init(&s->hdsp, avctx->flags);
775 
776  INIT_VLC_STATIC(&svq1_block_type, 2, 4,
777  &ff_svq1_block_type_vlc[0][1], 2, 1,
778  &ff_svq1_block_type_vlc[0][0], 2, 1, 6);
779 
780  INIT_VLC_STATIC(&svq1_motion_component, 7, 33,
781  &ff_mvtab[0][1], 2, 1,
782  &ff_mvtab[0][0], 2, 1, 176);
783 
784  for (i = 0; i < 6; i++) {
785  static const uint8_t sizes[2][6] = { { 14, 10, 14, 18, 16, 18 },
786  { 10, 10, 14, 14, 14, 16 } };
787  static VLC_TYPE table[168][2];
788  svq1_intra_multistage[i].table = &table[offset];
789  svq1_intra_multistage[i].table_allocated = sizes[0][i];
790  offset += sizes[0][i];
791  init_vlc(&svq1_intra_multistage[i], 3, 8,
792  &ff_svq1_intra_multistage_vlc[i][0][1], 2, 1,
793  &ff_svq1_intra_multistage_vlc[i][0][0], 2, 1,
795  svq1_inter_multistage[i].table = &table[offset];
796  svq1_inter_multistage[i].table_allocated = sizes[1][i];
797  offset += sizes[1][i];
798  init_vlc(&svq1_inter_multistage[i], 3, 8,
799  &ff_svq1_inter_multistage_vlc[i][0][1], 2, 1,
800  &ff_svq1_inter_multistage_vlc[i][0][0], 2, 1,
802  }
803 
804  INIT_VLC_STATIC(&svq1_intra_mean, 8, 256,
805  &ff_svq1_intra_mean_vlc[0][1], 4, 2,
806  &ff_svq1_intra_mean_vlc[0][0], 4, 2, 632);
807 
808  INIT_VLC_STATIC(&svq1_inter_mean, 9, 512,
809  &ff_svq1_inter_mean_vlc[0][1], 4, 2,
810  &ff_svq1_inter_mean_vlc[0][0], 4, 2, 1434);
811 
812  return 0;
813 }
814 
816 {
817  SVQ1Context *s = avctx->priv_data;
818 
819  av_frame_free(&s->prev);
820  av_freep(&s->pkt_swapped);
821  s->pkt_swapped_allocated = 0;
822 
823  return 0;
824 }
825 
826 static void svq1_flush(AVCodecContext *avctx)
827 {
828  SVQ1Context *s = avctx->priv_data;
829 
830  av_frame_unref(s->prev);
831 }
832 
834  .name = "svq1",
835  .long_name = NULL_IF_CONFIG_SMALL("Sorenson Vector Quantizer 1 / Sorenson Video 1 / SVQ1"),
836  .type = AVMEDIA_TYPE_VIDEO,
837  .id = AV_CODEC_ID_SVQ1,
838  .priv_data_size = sizeof(SVQ1Context),
840  .close = svq1_decode_end,
842  .capabilities = AV_CODEC_CAP_DR1,
843  .flush = svq1_flush,
844  .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV410P,
845  AV_PIX_FMT_NONE },
846 };
#define NULL
Definition: coverity.c:32
discard all frames except keyframes
Definition: avcodec.h:687
const char * s
Definition: avisynth_c.h:631
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
static VLC svq1_inter_multistage[6]
Definition: svq1dec.c:46
This structure describes decoded (raw) audio or video data.
Definition: frame.h:171
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:369
static VLC svq1_motion_component
Definition: svq1dec.c:44
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
static void flush(AVCodecContext *avctx)
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:260
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:216
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
int size
Definition: avcodec.h:1423
const uint8_t * buffer
Definition: get_bits.h:55
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1721
void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size)
Same behaviour av_fast_malloc but the buffer has additional AV_INPUT_BUFFER_PADDING_SIZE at the end w...
Definition: utils.c:126
#define VLC_TYPE
Definition: get_bits.h:61
discard all
Definition: avcodec.h:688
#define SVQ1_BLOCK_INTRA
Definition: svq1.h:43
AVCodec.
Definition: avcodec.h:3473
#define FFALIGN(x, a)
Definition: common.h:71
enum AVDiscard skip_frame
Skip decoding for selected frames.
Definition: avcodec.h:3227
const uint16_t ff_svq1_frame_size_table[7][2]
Definition: svq1.c:40
#define SVQ1_BLOCK_SKIP
Definition: svq1.h:40
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
static av_cold int svq1_decode_end(AVCodecContext *avctx)
Definition: svq1dec.c:815
uint8_t
#define av_cold
Definition: attributes.h:74
#define av_malloc(s)
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:135
static VLC svq1_intra_mean
Definition: svq1dec.c:47
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:476
static VLC svq1_intra_multistage[6]
Definition: svq1dec.c:45
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:363
static AVFrame * frame
uint8_t * data
Definition: avcodec.h:1422
bitstream reader API header.
#define AV_CODEC_FLAG_GRAY
Only decode/encode grayscale.
Definition: avcodec.h:762
#define av_log(a,...)
unsigned m
Definition: audioconvert.c:187
#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:220
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
static const int sizes[][2]
Definition: img2dec.c:48
#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:148
static const struct endianess table[]
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:175
#define SVQ1_CALC_CODEBOOK_ENTRIES(cbook)
Definition: svq1dec.c:144
int flags
AV_CODEC_FLAG_*.
Definition: avcodec.h:1596
const char * name
Name of the codec implementation.
Definition: avcodec.h:3480
#define SVQ1_BLOCK_INTER
Definition: svq1.h:41
static const uint8_t offset[127][2]
Definition: vf_spp.c:92
static void svq1_skip_block(uint8_t *current, uint8_t *previous, int pitch, int x, int y)
Definition: svq1dec.c:309
Libavcodec external API header.
Sorenson Vector Quantizer #1 (SVQ1) video codec.
Definition: get_bits.h:63
av_cold void ff_hpeldsp_init(HpelDSPContext *c, int flags)
Definition: hpeldsp.c:338
Half-pel DSP context.
Definition: hpeldsp.h:45
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:242
float y
static int svq1_decode_block_intra(GetBitContext *bitbuf, uint8_t *pixels, int pitch)
Definition: svq1dec.c:156
int width
Definition: svq1dec.c:64
const uint8_t ff_svq1_block_type_vlc[4][2]
Definition: svq1_vlc.h:27
int width
picture width / height.
Definition: avcodec.h:1680
HpelDSPContext hdsp
Definition: svq1dec.c:57
int size_in_bits
Definition: get_bits.h:57
uint8_t * pkt_swapped
Definition: svq1dec.c:61
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:555
int n
Definition: avisynth_c.h:547
static void svq1_flush(AVCodecContext *avctx)
Definition: svq1dec.c:826
int pkt_swapped_allocated
Definition: svq1dec.c:62
static void svq1_parse_string(GetBitContext *bitbuf, uint8_t out[257])
Definition: svq1dec.c:503
#define INIT_VLC_USE_NEW_STATIC
Definition: get_bits.h:474
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:446
int table_allocated
Definition: get_bits.h:66
static const int8_t mv[256][2]
Definition: 4xm.c:77
Half-pel DSP functions.
#define AV_LOG_INFO
Standard information.
Definition: log.h:187
AVS_Value src
Definition: avisynth_c.h:482
#define ff_dlog(ctx,...)
Definition: internal.h:54
AVFrame * prev
Definition: svq1dec.c:59
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:199
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:441
main external API structure.
Definition: avcodec.h:1501
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:1040
#define init_vlc(vlc, nb_bits, nb_codes,bits, bits_wrap, bits_size,codes, codes_wrap, codes_size,flags)
Definition: get_bits.h:457
op_pixels_func put_pixels_tab[4][4]
Halfpel motion compensation with rounding (a+b+1)>>1.
Definition: hpeldsp.h:56
void * buf
Definition: avisynth_c.h:553
static VLC svq1_inter_mean
Definition: svq1dec.c:48
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:304
BYTE int const BYTE int int int height
Definition: avisynth_c.h:676
static void skip_bits1(GetBitContext *s)
Definition: get_bits.h:329
planar YUV 4:1:0, 9bpp, (1 Cr & Cb sample per 4x4 Y samples)
Definition: pixfmt.h:69
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:326
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:297
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:410
GetBitContext gb
Definition: svq1dec.c:58
#define mid_pred
Definition: mathops.h:96
static int svq1_decode_block_non_intra(GetBitContext *bitbuf, uint8_t *pixels, int pitch)
Definition: svq1dec.c:223
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:209
static av_const int sign_extend(int val, unsigned bits)
Definition: mathops.h:139
int height
Definition: svq1dec.c:65
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
Definition: frame.c:462
#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:182
uint8_t level
Definition: svq3.c:150
static int decode(AVCodecContext *avctx, void *data, int *got_sub, AVPacket *avpkt)
Definition: ccaption_dec.c:522
discard all non reference
Definition: avcodec.h:684
static int svq1_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: svq1dec.c:611
const int8_t *const ff_svq1_intra_codebooks[6]
Definition: svq1_cb.h:1519
common internal api header.
const uint8_t ff_svq1_intra_multistage_vlc[6][8][2]
Definition: svq1_vlc.h:33
int frame_code
Definition: svq1dec.c:66
static const uint8_t string_table[256]
Definition: svq1dec.c:70
static int svq1_decode_motion_vector(GetBitContext *bitbuf, svq1_pmv *mv, svq1_pmv **pmv)
Definition: svq1dec.c:283
const uint16_t ff_svq1_inter_mean_vlc[512][2]
Definition: svq1_vlc.h:136
int y
Definition: svq1dec.c:53
void * priv_data
Definition: avcodec.h:1543
static av_always_inline int diff(const uint32_t a, const uint32_t b)
#define av_free(p)
int pixels
Definition: avisynth_c.h:298
#define SVQ1_PROCESS_VECTOR()
Definition: svq1dec.c:105
int nonref
Definition: svq1dec.c:67
VLC_TYPE(* table)[2]
code, bits
Definition: get_bits.h:65
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=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);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_AARCH64) ff_audio_convert_init_aarch64(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_log(ac->avr, AV_LOG_TRACE,"%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
static av_cold int svq1_decode_init(AVCodecContext *avctx)
Definition: svq1dec.c:760
int height
Definition: frame.h:220
#define av_freep(p)
static int skip_1stop_8data_bits(GetBitContext *gb)
Definition: get_bits.h:593
static VLC svq1_block_type
Definition: svq1dec.c:43
AVCodec ff_svq1_decoder
Definition: svq1dec.c:833
AVPixelFormat
Pixel format.
Definition: pixfmt.h:61
This structure stores compressed data.
Definition: avcodec.h:1399
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:1215
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:856
Predicted.
Definition: avutil.h:275
const uint8_t ff_mvtab[33][2]
Definition: h263data.c:90
int x
Definition: svq1dec.c:52
static int width