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 "dsputil.h"
37 #include "get_bits.h"
38 #include "internal.h"
39 #include "mathops.h"
40 #include "svq1.h"
41 
42 #undef NDEBUG
43 #include <assert.h>
44 
45 extern const uint8_t ff_mvtab[33][2];
46 
53 
54 /* motion vector (prediction) */
55 typedef struct svq1_pmv_s {
56  int x;
57  int y;
58 } svq1_pmv;
59 
60 typedef struct SVQ1Context {
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) == 0) \
115  break; \
116  /* add child nodes */ \
117  list[n++] = list[i]; \
118  list[n++] = list[i] + \
119  (((level & 1) ? pitch : 1) << (level / 2 + 1)); \
120  }
121 
122 #define SVQ1_ADD_CODEBOOK() \
123  /* add codebook entries to vector */ \
124  for (j = 0; j < stages; j++) { \
125  n3 = codebook[entries[j]] ^ 0x80808080; \
126  n1 += (n3 & 0xFF00FF00) >> 8; \
127  n2 += n3 & 0x00FF00FF; \
128  } \
129  \
130  /* clip to [0..255] */ \
131  if (n1 & 0xFF00FF00) { \
132  n3 = (n1 >> 15 & 0x00010001 | 0x01000100) - 0x00010001; \
133  n1 += 0x7F007F00; \
134  n1 |= (~n1 >> 15 & 0x00010001 | 0x01000100) - 0x00010001; \
135  n1 &= n3 & 0x00FF00FF; \
136  } \
137  \
138  if (n2 & 0xFF00FF00) { \
139  n3 = (n2 >> 15 & 0x00010001 | 0x01000100) - 0x00010001; \
140  n2 += 0x7F007F00; \
141  n2 |= (~n2 >> 15 & 0x00010001 | 0x01000100) - 0x00010001; \
142  n2 &= n3 & 0x00FF00FF; \
143  }
144 
145 #define SVQ1_CALC_CODEBOOK_ENTRIES(cbook) \
146  codebook = (const uint32_t *)cbook[level]; \
147  if (stages > 0) \
148  bit_cache = get_bits(bitbuf, 4 * stages); \
149  /* calculate codebook entries for this vector */ \
150  for (j = 0; j < stages; j++) { \
151  entries[j] = (((bit_cache >> (4 * (stages - j - 1))) & 0xF) + \
152  16 * j) << (level + 1); \
153  } \
154  mean -= stages * 128; \
155  n4 = mean + (mean >> 31) << 16 | (mean & 0xFFFF);
156 
157 static int svq1_decode_block_intra(GetBitContext *bitbuf, uint8_t *pixels,
158  int pitch)
159 {
160  uint32_t bit_cache;
161  uint8_t *list[63];
162  uint32_t *dst;
163  const uint32_t *codebook;
164  int entries[6];
165  int i, j, m, n;
166  int mean, stages;
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  av_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 
198  mean = get_vlc2(bitbuf, svq1_intra_mean.table, 8, 3);
199 
200  if (stages == 0) {
201  for (y = 0; y < height; y++)
202  memset(&dst[y * (pitch / 4)], mean, width);
203  } else {
205 
206  for (y = 0; y < height; y++) {
207  for (x = 0; x < width / 4; x++, codebook++) {
208  n1 = n4;
209  n2 = n4;
211  /* store result */
212  dst[x] = n1 << 8 | n2;
213  }
214  dst += pitch / 4;
215  }
216  }
217  }
218 
219  return 0;
220 }
221 
223  int pitch)
224 {
225  uint32_t bit_cache;
226  uint8_t *list[63];
227  uint32_t *dst;
228  const uint32_t *codebook;
229  int entries[6];
230  int i, j, m, n;
231  int mean, stages;
232  int x, y, width, height, level;
233  uint32_t n1, n2, n3, n4;
234 
235  /* initialize list for breadth first processing of vectors */
236  list[0] = pixels;
237 
238  /* recursively process vector */
239  for (i = 0, m = 1, n = 1, level = 5; i < n; i++) {
241 
242  /* destination address and vector size */
243  dst = (uint32_t *)list[i];
244  width = 1 << ((4 + level) / 2);
245  height = 1 << ((3 + level) / 2);
246 
247  /* get number of stages (-1 skips vector, 0 for mean only) */
248  stages = get_vlc2(bitbuf, svq1_inter_multistage[level].table, 3, 2) - 1;
249 
250  if (stages == -1)
251  continue; /* skip vector */
252 
253  if ((stages > 0) && (level >= 4)) {
254  av_dlog(NULL,
255  "Error (svq1_decode_block_non_intra): invalid vector: stages=%i level=%i\n",
256  stages, level);
257  return AVERROR_INVALIDDATA; /* invalid vector */
258  }
259 
260  mean = get_vlc2(bitbuf, svq1_inter_mean.table, 9, 3) - 256;
261 
263 
264  for (y = 0; y < height; y++) {
265  for (x = 0; x < width / 4; x++, codebook++) {
266  n3 = dst[x];
267  /* add mean value to vector */
268  n1 = n4 + ((n3 & 0xFF00FF00) >> 8);
269  n2 = n4 + (n3 & 0x00FF00FF);
271  /* store result */
272  dst[x] = n1 << 8 | n2;
273  }
274  dst += pitch / 4;
275  }
276  }
277  return 0;
278 }
279 
281  svq1_pmv **pmv)
282 {
283  int diff;
284  int i;
285 
286  for (i = 0; i < 2; i++) {
287  /* get motion code */
288  diff = get_vlc2(bitbuf, svq1_motion_component.table, 7, 2);
289  if (diff < 0)
290  return AVERROR_INVALIDDATA;
291  else if (diff) {
292  if (get_bits1(bitbuf))
293  diff = -diff;
294  }
295 
296  /* add median of motion vector predictors and clip result */
297  if (i == 1)
298  mv->y = sign_extend(diff + mid_pred(pmv[0]->y, pmv[1]->y, pmv[2]->y), 6);
299  else
300  mv->x = sign_extend(diff + mid_pred(pmv[0]->x, pmv[1]->x, pmv[2]->x), 6);
301  }
302 
303  return 0;
304 }
305 
306 static void svq1_skip_block(uint8_t *current, uint8_t *previous,
307  int pitch, int x, int y)
308 {
309  uint8_t *src;
310  uint8_t *dst;
311  int i;
312 
313  src = &previous[x + y * pitch];
314  dst = current;
315 
316  for (i = 0; i < 16; i++) {
317  memcpy(dst, src, 16);
318  src += pitch;
319  dst += pitch;
320  }
321 }
322 
324  uint8_t *current, uint8_t *previous,
325  int pitch, svq1_pmv *motion, int x, int y,
326  int width, int height)
327 {
328  uint8_t *src;
329  uint8_t *dst;
330  svq1_pmv mv;
331  svq1_pmv *pmv[3];
332  int result;
333 
334  /* predict and decode motion vector */
335  pmv[0] = &motion[0];
336  if (y == 0) {
337  pmv[1] =
338  pmv[2] = pmv[0];
339  } else {
340  pmv[1] = &motion[x / 8 + 2];
341  pmv[2] = &motion[x / 8 + 4];
342  }
343 
344  result = svq1_decode_motion_vector(bitbuf, &mv, pmv);
345 
346  if (result != 0)
347  return result;
348 
349  motion[0].x =
350  motion[x / 8 + 2].x =
351  motion[x / 8 + 3].x = mv.x;
352  motion[0].y =
353  motion[x / 8 + 2].y =
354  motion[x / 8 + 3].y = mv.y;
355 
356  mv.x = av_clip(mv.x, -2 * x, 2 * (width - x - 16));
357  mv.y = av_clip(mv.y, -2 * y, 2 * (height - y - 16));
358 
359  src = &previous[(x + (mv.x >> 1)) + (y + (mv.y >> 1)) * pitch];
360  dst = current;
361 
362  dsp->put_pixels_tab[0][(mv.y & 1) << 1 | (mv.x & 1)](dst, src, pitch, 16);
363 
364  return 0;
365 }
366 
368  uint8_t *current, uint8_t *previous,
369  int pitch, svq1_pmv *motion, int x, int y,
370  int width, int height)
371 {
372  uint8_t *src;
373  uint8_t *dst;
374  svq1_pmv mv;
375  svq1_pmv *pmv[4];
376  int i, result;
377 
378  /* predict and decode motion vector (0) */
379  pmv[0] = &motion[0];
380  if (y == 0) {
381  pmv[1] =
382  pmv[2] = pmv[0];
383  } else {
384  pmv[1] = &motion[(x / 8) + 2];
385  pmv[2] = &motion[(x / 8) + 4];
386  }
387 
388  result = svq1_decode_motion_vector(bitbuf, &mv, pmv);
389 
390  if (result != 0)
391  return result;
392 
393  /* predict and decode motion vector (1) */
394  pmv[0] = &mv;
395  if (y == 0) {
396  pmv[1] =
397  pmv[2] = pmv[0];
398  } else {
399  pmv[1] = &motion[(x / 8) + 3];
400  }
401  result = svq1_decode_motion_vector(bitbuf, &motion[0], pmv);
402 
403  if (result != 0)
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 
412  if (result != 0)
413  return result;
414 
415  /* predict and decode motion vector (3) */
416  pmv[2] = &motion[(x / 8) + 2];
417  pmv[3] = &motion[(x / 8) + 3];
418 
419  result = svq1_decode_motion_vector(bitbuf, pmv[3], pmv);
420 
421  if (result != 0)
422  return result;
423 
424  /* form predictions */
425  for (i = 0; i < 4; i++) {
426  int mvx = pmv[i]->x + (i & 1) * 16;
427  int mvy = pmv[i]->y + (i >> 1) * 16;
428 
429  // FIXME: clipping or padding?
430  mvx = av_clip(mvx, -2 * x, 2 * (width - x - 8));
431  mvy = av_clip(mvy, -2 * y, 2 * (height - y - 8));
432 
433  src = &previous[(x + (mvx >> 1)) + (y + (mvy >> 1)) * pitch];
434  dst = current;
435 
436  dsp->put_pixels_tab[1][((mvy & 1) << 1) | (mvx & 1)](dst, src, pitch, 8);
437 
438  /* select next block */
439  if (i & 1)
440  current += 8 * (pitch - 1);
441  else
442  current += 8;
443  }
444 
445  return 0;
446 }
447 
449  GetBitContext *bitbuf,
450  uint8_t *current, uint8_t *previous,
451  int pitch, svq1_pmv *motion, int x, int y,
452  int width, int height)
453 {
454  uint32_t block_type;
455  int result = 0;
456 
457  /* get block type */
458  block_type = get_vlc2(bitbuf, svq1_block_type.table, 2, 2);
459 
460  /* reset motion vectors */
461  if (block_type == SVQ1_BLOCK_SKIP || block_type == SVQ1_BLOCK_INTRA) {
462  motion[0].x =
463  motion[0].y =
464  motion[x / 8 + 2].x =
465  motion[x / 8 + 2].y =
466  motion[x / 8 + 3].x =
467  motion[x / 8 + 3].y = 0;
468  }
469 
470  switch (block_type) {
471  case SVQ1_BLOCK_SKIP:
472  svq1_skip_block(current, previous, pitch, x, y);
473  break;
474 
475  case SVQ1_BLOCK_INTER:
476  result = svq1_motion_inter_block(dsp, bitbuf, current, previous,
477  pitch, motion, x, y, width, height);
478 
479  if (result != 0) {
480  av_dlog(avctx, "Error in svq1_motion_inter_block %i\n", result);
481  break;
482  }
483  result = svq1_decode_block_non_intra(bitbuf, current, pitch);
484  break;
485 
486  case SVQ1_BLOCK_INTER_4V:
487  result = svq1_motion_inter_4v_block(dsp, bitbuf, current, previous,
488  pitch, motion, x, y, width, height);
489 
490  if (result != 0) {
491  av_dlog(avctx, "Error in svq1_motion_inter_4v_block %i\n", result);
492  break;
493  }
494  result = svq1_decode_block_non_intra(bitbuf, current, pitch);
495  break;
496 
497  case SVQ1_BLOCK_INTRA:
498  result = svq1_decode_block_intra(bitbuf, current, pitch);
499  break;
500  }
501 
502  return result;
503 }
504 
505 static void svq1_parse_string(GetBitContext *bitbuf, uint8_t *out)
506 {
507  uint8_t seed;
508  int i;
509 
510  out[0] = get_bits(bitbuf, 8);
511  seed = string_table[out[0]];
512 
513  for (i = 1; i <= out[0]; i++) {
514  out[i] = get_bits(bitbuf, 8) ^ seed;
515  seed = string_table[out[i] ^ seed];
516  }
517 }
518 
520 {
521  SVQ1Context *s = avctx->priv_data;
522  GetBitContext *bitbuf = &s->gb;
523  int frame_size_code;
524 
525  skip_bits(bitbuf, 8); /* temporal_reference */
526 
527  /* frame type */
528  s->nonref = 0;
529  switch (get_bits(bitbuf, 2)) {
530  case 0:
531  frame->pict_type = AV_PICTURE_TYPE_I;
532  break;
533  case 2:
534  s->nonref = 1;
535  case 1:
536  frame->pict_type = AV_PICTURE_TYPE_P;
537  break;
538  default:
539  av_log(avctx, AV_LOG_ERROR, "Invalid frame type.\n");
540  return AVERROR_INVALIDDATA;
541  }
542 
543  if (frame->pict_type == AV_PICTURE_TYPE_I) {
544  /* unknown fields */
545  if (s->frame_code == 0x50 || s->frame_code == 0x60) {
546  int csum = get_bits(bitbuf, 16);
547 
548  csum = ff_svq1_packet_checksum(bitbuf->buffer,
549  bitbuf->size_in_bits >> 3,
550  csum);
551 
552  av_dlog(avctx, "%s checksum (%02x) for packet data\n",
553  (csum == 0) ? "correct" : "incorrect", csum);
554  }
555 
556  if ((s->frame_code ^ 0x10) >= 0x50) {
557  uint8_t msg[256];
558 
559  svq1_parse_string(bitbuf, msg);
560 
561  av_log(avctx, AV_LOG_INFO,
562  "embedded message: \"%s\"\n", (char *)msg);
563  }
564 
565  skip_bits(bitbuf, 2);
566  skip_bits(bitbuf, 2);
567  skip_bits1(bitbuf);
568 
569  /* load frame size */
570  frame_size_code = get_bits(bitbuf, 3);
571 
572  if (frame_size_code == 7) {
573  /* load width, height (12 bits each) */
574  s->width = get_bits(bitbuf, 12);
575  s->height = get_bits(bitbuf, 12);
576 
577  if (!s->width || !s->height)
578  return AVERROR_INVALIDDATA;
579  } else {
580  /* get width, height from table */
581  s->width = ff_svq1_frame_size_table[frame_size_code].width;
582  s->height = ff_svq1_frame_size_table[frame_size_code].height;
583  }
584  }
585 
586  /* unknown fields */
587  if (get_bits1(bitbuf) == 1) {
588  skip_bits1(bitbuf); /* use packet checksum if (1) */
589  skip_bits1(bitbuf); /* component checksums after image data if (1) */
590 
591  if (get_bits(bitbuf, 2) != 0)
592  return AVERROR_INVALIDDATA;
593  }
594 
595  if (get_bits1(bitbuf) == 1) {
596  skip_bits1(bitbuf);
597  skip_bits(bitbuf, 4);
598  skip_bits1(bitbuf);
599  skip_bits(bitbuf, 2);
600 
601  while (get_bits1(bitbuf) == 1)
602  skip_bits(bitbuf, 8);
603  }
604 
605  return 0;
606 }
607 
608 static int svq1_decode_frame(AVCodecContext *avctx, void *data,
609  int *got_frame, AVPacket *avpkt)
610 {
611  const uint8_t *buf = avpkt->data;
612  int buf_size = avpkt->size;
613  SVQ1Context *s = avctx->priv_data;
614  AVFrame *cur = s->cur;
615  uint8_t *current;
616  int result, i, x, y, width, height;
617  svq1_pmv *pmv;
618 
619  if (cur->data[0])
620  avctx->release_buffer(avctx, cur);
621 
622  /* initialize bit buffer */
623  init_get_bits(&s->gb, buf, buf_size * 8);
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 = (uint32_t *)(buf + 4);
634 
635  for (i = 0; i < 4; i++)
636  src[i] = ((src[i] << 16) | (src[i] >> 16)) ^ src[7 - i];
637  }
638 
639  result = svq1_decode_frame_header(avctx, cur);
640 
641  if (result != 0) {
642  av_dlog(avctx, "Error in svq1_decode_frame_header %i\n", result);
643  return result;
644  }
645  avcodec_set_dimensions(avctx, s->width, s->height);
646 
647  if ((avctx->skip_frame >= AVDISCARD_NONREF && s->nonref) ||
648  (avctx->skip_frame >= AVDISCARD_NONKEY &&
649  cur->pict_type != AV_PICTURE_TYPE_I) ||
650  avctx->skip_frame >= AVDISCARD_ALL)
651  return buf_size;
652 
653  result = ff_get_buffer(avctx, cur);
654  if (result < 0)
655  return result;
656 
657  pmv = av_malloc((FFALIGN(s->width, 16) / 8 + 3) * sizeof(*pmv));
658  if (!pmv)
659  return AVERROR(ENOMEM);
660 
661  /* decode y, u and v components */
662  for (i = 0; i < 3; i++) {
663  int linesize = cur->linesize[i];
664  if (i == 0) {
665  width = FFALIGN(s->width, 16);
666  height = FFALIGN(s->height, 16);
667  } else {
668  if (avctx->flags & CODEC_FLAG_GRAY)
669  break;
670  width = FFALIGN(s->width / 4, 16);
671  height = FFALIGN(s->height / 4, 16);
672  }
673 
674  current = cur->data[i];
675 
676  if (cur->pict_type == AV_PICTURE_TYPE_I) {
677  /* keyframe */
678  for (y = 0; y < height; y += 16) {
679  for (x = 0; x < width; x += 16) {
680  result = svq1_decode_block_intra(&s->gb, &current[x],
681  linesize);
682  if (result != 0) {
683  av_log(avctx, AV_LOG_INFO,
684  "Error in svq1_decode_block %i (keyframe)\n",
685  result);
686  goto err;
687  }
688  }
689  current += 16 * linesize;
690  }
691  } else {
692  /* delta frame */
693  uint8_t *previous = s->prev->data[i];
694  if (!previous ||
695  s->prev->width != s->width || s->prev->height != s->height) {
696  av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n");
697  result = AVERROR_INVALIDDATA;
698  goto err;
699  }
700 
701  memset(pmv, 0, ((width / 8) + 3) * sizeof(svq1_pmv));
702 
703  for (y = 0; y < height; y += 16) {
704  for (x = 0; x < width; x += 16) {
705  result = svq1_decode_delta_block(avctx, &s->dsp,
706  &s->gb, &current[x],
707  previous, linesize,
708  pmv, x, y, width, height);
709  if (result != 0) {
710  av_dlog(avctx,
711  "Error in svq1_decode_delta_block %i\n",
712  result);
713  goto err;
714  }
715  }
716 
717  pmv[0].x =
718  pmv[0].y = 0;
719 
720  current += 16 * linesize;
721  }
722  }
723  }
724 
725  *(AVFrame*)data = *cur;
726  if (!s->nonref)
727  FFSWAP(AVFrame*, s->cur, s->prev);
728 
729  *got_frame = 1;
730  result = buf_size;
731 
732 err:
733  av_free(pmv);
734  return result;
735 }
736 
738 {
739  SVQ1Context *s = avctx->priv_data;
740  int i;
741  int offset = 0;
742 
743  s->cur = avcodec_alloc_frame();
744  s->prev = avcodec_alloc_frame();
745  if (!s->cur || !s->prev) {
746  avcodec_free_frame(&s->cur);
748  return AVERROR(ENOMEM);
749  }
750 
751  s->width = avctx->width + 3 & ~3;
752  s->height = avctx->height + 3 & ~3;
753  avctx->pix_fmt = AV_PIX_FMT_YUV410P;
754 
755  ff_dsputil_init(&s->dsp, avctx);
756 
757  INIT_VLC_STATIC(&svq1_block_type, 2, 4,
758  &ff_svq1_block_type_vlc[0][1], 2, 1,
759  &ff_svq1_block_type_vlc[0][0], 2, 1, 6);
760 
761  INIT_VLC_STATIC(&svq1_motion_component, 7, 33,
762  &ff_mvtab[0][1], 2, 1,
763  &ff_mvtab[0][0], 2, 1, 176);
764 
765  for (i = 0; i < 6; i++) {
766  static const uint8_t sizes[2][6] = { { 14, 10, 14, 18, 16, 18 },
767  { 10, 10, 14, 14, 14, 16 } };
768  static VLC_TYPE table[168][2];
769  svq1_intra_multistage[i].table = &table[offset];
770  svq1_intra_multistage[i].table_allocated = sizes[0][i];
771  offset += sizes[0][i];
772  init_vlc(&svq1_intra_multistage[i], 3, 8,
773  &ff_svq1_intra_multistage_vlc[i][0][1], 2, 1,
774  &ff_svq1_intra_multistage_vlc[i][0][0], 2, 1,
776  svq1_inter_multistage[i].table = &table[offset];
777  svq1_inter_multistage[i].table_allocated = sizes[1][i];
778  offset += sizes[1][i];
779  init_vlc(&svq1_inter_multistage[i], 3, 8,
780  &ff_svq1_inter_multistage_vlc[i][0][1], 2, 1,
781  &ff_svq1_inter_multistage_vlc[i][0][0], 2, 1,
783  }
784 
785  INIT_VLC_STATIC(&svq1_intra_mean, 8, 256,
786  &ff_svq1_intra_mean_vlc[0][1], 4, 2,
787  &ff_svq1_intra_mean_vlc[0][0], 4, 2, 632);
788 
789  INIT_VLC_STATIC(&svq1_inter_mean, 9, 512,
790  &ff_svq1_inter_mean_vlc[0][1], 4, 2,
791  &ff_svq1_inter_mean_vlc[0][0], 4, 2, 1434);
792 
793  return 0;
794 }
795 
797 {
798  SVQ1Context *s = avctx->priv_data;
799 
800  if (s->cur->data[0])
801  avctx->release_buffer(avctx, s->cur);
802  if (s->prev->data[0])
803  avctx->release_buffer(avctx, s->prev);
804  avcodec_free_frame(&s->cur);
806 
807  return 0;
808 }
809 
810 static void svq1_flush(AVCodecContext *avctx)
811 {
812  SVQ1Context *s = avctx->priv_data;
813 
814  if (s->cur->data[0])
815  avctx->release_buffer(avctx, s->cur);
816  if (s->prev->data[0])
817  avctx->release_buffer(avctx, s->prev);
818 }
819 
821  .name = "svq1",
822  .type = AVMEDIA_TYPE_VIDEO,
823  .id = AV_CODEC_ID_SVQ1,
824  .priv_data_size = sizeof(SVQ1Context),
828  .capabilities = CODEC_CAP_DR1,
829  .flush = svq1_flush,
830  .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV410P,
831  AV_PIX_FMT_NONE },
832  .long_name = NULL_IF_CONFIG_SMALL("Sorenson Vector Quantizer 1 / Sorenson Video 1 / SVQ1"),
833 };