mjpegdec.c
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1 /*
2  * MJPEG decoder
3  * Copyright (c) 2000, 2001 Fabrice Bellard
4  * Copyright (c) 2003 Alex Beregszaszi
5  * Copyright (c) 2003-2004 Michael Niedermayer
6  *
7  * Support for external huffman table, various fixes (AVID workaround),
8  * aspecting, new decode_frame mechanism and apple mjpeg-b support
9  * by Alex Beregszaszi
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 
33 // #define DEBUG
34 #include <assert.h>
35 
36 #include "libavutil/imgutils.h"
37 #include "libavutil/opt.h"
38 #include "avcodec.h"
39 #include "dsputil.h"
40 #include "mjpeg.h"
41 #include "mjpegdec.h"
42 #include "jpeglsdec.h"
43 
44 
45 static int build_vlc(VLC *vlc, const uint8_t *bits_table,
46  const uint8_t *val_table, int nb_codes,
47  int use_static, int is_ac)
48 {
49  uint8_t huff_size[256];
50  uint16_t huff_code[256];
51  uint16_t huff_sym[256];
52  int i;
53 
54  assert(nb_codes <= 256);
55 
56  memset(huff_size, 0, sizeof(huff_size));
57  ff_mjpeg_build_huffman_codes(huff_size, huff_code, bits_table, val_table);
58 
59  for (i = 0; i < 256; i++)
60  huff_sym[i] = i + 16 * is_ac;
61 
62  if (is_ac)
63  huff_sym[0] = 16 * 256;
64 
65  return init_vlc_sparse(vlc, 9, nb_codes, huff_size, 1, 1,
66  huff_code, 2, 2, huff_sym, 2, 2, use_static);
67 }
68 
70 {
72  ff_mjpeg_val_dc, 12, 0, 0);
74  ff_mjpeg_val_dc, 12, 0, 0);
76  ff_mjpeg_val_ac_luminance, 251, 0, 1);
78  ff_mjpeg_val_ac_chrominance, 251, 0, 1);
80  ff_mjpeg_val_ac_luminance, 251, 0, 0);
82  ff_mjpeg_val_ac_chrominance, 251, 0, 0);
83 }
84 
86 {
87  MJpegDecodeContext *s = avctx->priv_data;
88 
89  if (!s->picture_ptr)
90  s->picture_ptr = &s->picture;
91 
92  s->avctx = avctx;
93  dsputil_init(&s->dsp, avctx);
95  s->buffer_size = 0;
96  s->buffer = NULL;
97  s->start_code = -1;
98  s->first_picture = 1;
99  s->org_height = avctx->coded_height;
101 
103 
104 #if FF_API_MJPEG_GLOBAL_OPTS
105  if (avctx->flags & CODEC_FLAG_EXTERN_HUFF)
106  s->extern_huff = 1;
107 #endif
108  if (s->extern_huff) {
109  av_log(avctx, AV_LOG_INFO, "mjpeg: using external huffman table\n");
110  init_get_bits(&s->gb, avctx->extradata, avctx->extradata_size * 8);
111  if (ff_mjpeg_decode_dht(s)) {
112  av_log(avctx, AV_LOG_ERROR,
113  "mjpeg: error using external huffman table\n");
114  return AVERROR_INVALIDDATA;
115  }
116  }
117  if (avctx->field_order == AV_FIELD_BB) { /* quicktime icefloe 019 */
118  s->interlace_polarity = 1; /* bottom field first */
119  av_log(avctx, AV_LOG_DEBUG, "mjpeg bottom field first\n");
120  }
121  if (avctx->codec->id == CODEC_ID_AMV)
122  s->flipped = 1;
123 
124  return 0;
125 }
126 
127 
128 /* quantize tables */
130 {
131  int len, index, i, j;
132 
133  len = get_bits(&s->gb, 16) - 2;
134 
135  while (len >= 65) {
136  /* only 8 bit precision handled */
137  if (get_bits(&s->gb, 4) != 0) {
138  av_log(s->avctx, AV_LOG_ERROR, "dqt: 16bit precision\n");
139  return -1;
140  }
141  index = get_bits(&s->gb, 4);
142  if (index >= 4)
143  return -1;
144  av_log(s->avctx, AV_LOG_DEBUG, "index=%d\n", index);
145  /* read quant table */
146  for (i = 0; i < 64; i++) {
147  j = s->scantable.permutated[i];
148  s->quant_matrixes[index][j] = get_bits(&s->gb, 8);
149  }
150 
151  // XXX FIXME finetune, and perhaps add dc too
152  s->qscale[index] = FFMAX(s->quant_matrixes[index][s->scantable.permutated[1]],
153  s->quant_matrixes[index][s->scantable.permutated[8]]) >> 1;
154  av_log(s->avctx, AV_LOG_DEBUG, "qscale[%d]: %d\n",
155  index, s->qscale[index]);
156  len -= 65;
157  }
158  return 0;
159 }
160 
161 /* decode huffman tables and build VLC decoders */
163 {
164  int len, index, i, class, n, v, code_max;
165  uint8_t bits_table[17];
166  uint8_t val_table[256];
167 
168  len = get_bits(&s->gb, 16) - 2;
169 
170  while (len > 0) {
171  if (len < 17)
172  return -1;
173  class = get_bits(&s->gb, 4);
174  if (class >= 2)
175  return -1;
176  index = get_bits(&s->gb, 4);
177  if (index >= 4)
178  return -1;
179  n = 0;
180  for (i = 1; i <= 16; i++) {
181  bits_table[i] = get_bits(&s->gb, 8);
182  n += bits_table[i];
183  }
184  len -= 17;
185  if (len < n || n > 256)
186  return -1;
187 
188  code_max = 0;
189  for (i = 0; i < n; i++) {
190  v = get_bits(&s->gb, 8);
191  if (v > code_max)
192  code_max = v;
193  val_table[i] = v;
194  }
195  len -= n;
196 
197  /* build VLC and flush previous vlc if present */
198  free_vlc(&s->vlcs[class][index]);
199  av_log(s->avctx, AV_LOG_DEBUG, "class=%d index=%d nb_codes=%d\n",
200  class, index, code_max + 1);
201  if (build_vlc(&s->vlcs[class][index], bits_table, val_table,
202  code_max + 1, 0, class > 0) < 0)
203  return -1;
204 
205  if (class > 0) {
206  free_vlc(&s->vlcs[2][index]);
207  if (build_vlc(&s->vlcs[2][index], bits_table, val_table,
208  code_max + 1, 0, 0) < 0)
209  return -1;
210  }
211  }
212  return 0;
213 }
214 
216 {
217  int len, nb_components, i, width, height, pix_fmt_id;
218 
219  /* XXX: verify len field validity */
220  len = get_bits(&s->gb, 16);
221  s->bits = get_bits(&s->gb, 8);
222 
223  if (s->pegasus_rct)
224  s->bits = 9;
225  if (s->bits == 9 && !s->pegasus_rct)
226  s->rct = 1; // FIXME ugly
227 
228  if (s->bits != 8 && !s->lossless) {
229  av_log(s->avctx, AV_LOG_ERROR, "only 8 bits/component accepted\n");
230  return -1;
231  }
232 
233  height = get_bits(&s->gb, 16);
234  width = get_bits(&s->gb, 16);
235 
236  // HACK for odd_height.mov
237  if (s->interlaced && s->width == width && s->height == height + 1)
238  height= s->height;
239 
240  av_log(s->avctx, AV_LOG_DEBUG, "sof0: picture: %dx%d\n", width, height);
241  if (av_image_check_size(width, height, 0, s->avctx))
242  return -1;
243 
244  nb_components = get_bits(&s->gb, 8);
245  if (nb_components <= 0 ||
246  nb_components > MAX_COMPONENTS)
247  return -1;
248  if (s->ls && !(s->bits <= 8 || nb_components == 1)) {
250  "only <= 8 bits/component or 16-bit gray accepted for JPEG-LS\n");
251  return -1;
252  }
253  s->nb_components = nb_components;
254  s->h_max = 1;
255  s->v_max = 1;
256  for (i = 0; i < nb_components; i++) {
257  /* component id */
258  s->component_id[i] = get_bits(&s->gb, 8) - 1;
259  s->h_count[i] = get_bits(&s->gb, 4);
260  s->v_count[i] = get_bits(&s->gb, 4);
261  /* compute hmax and vmax (only used in interleaved case) */
262  if (s->h_count[i] > s->h_max)
263  s->h_max = s->h_count[i];
264  if (s->v_count[i] > s->v_max)
265  s->v_max = s->v_count[i];
266  s->quant_index[i] = get_bits(&s->gb, 8);
267  if (s->quant_index[i] >= 4)
268  return -1;
269  av_log(s->avctx, AV_LOG_DEBUG, "component %d %d:%d id: %d quant:%d\n",
270  i, s->h_count[i], s->v_count[i],
271  s->component_id[i], s->quant_index[i]);
272  }
273 
274  if (s->ls && (s->h_max > 1 || s->v_max > 1)) {
276  "Subsampling in JPEG-LS is not supported.\n");
277  return -1;
278  }
279 
280  if (s->v_max == 1 && s->h_max == 1 && s->lossless == 1)
281  s->rgb = 1;
282 
283  /* if different size, realloc/alloc picture */
284  /* XXX: also check h_count and v_count */
285  if (width != s->width || height != s->height) {
286  av_freep(&s->qscale_table);
287 
288  s->width = width;
289  s->height = height;
290  s->interlaced = 0;
291 
292  /* test interlaced mode */
293  if (s->first_picture &&
294  s->org_height != 0 &&
295  s->height < ((s->org_height * 3) / 4)) {
296  s->interlaced = 1;
300  height *= 2;
301  }
302 
303  avcodec_set_dimensions(s->avctx, width, height);
304 
305  s->qscale_table = av_mallocz((s->width + 15) / 16);
306  s->first_picture = 0;
307  }
308 
309  if (!(s->interlaced && (s->bottom_field == !s->interlace_polarity))) {
310  /* XXX: not complete test ! */
311  pix_fmt_id = (s->h_count[0] << 28) | (s->v_count[0] << 24) |
312  (s->h_count[1] << 20) | (s->v_count[1] << 16) |
313  (s->h_count[2] << 12) | (s->v_count[2] << 8) |
314  (s->h_count[3] << 4) | s->v_count[3];
315  av_log(s->avctx, AV_LOG_DEBUG, "pix fmt id %x\n", pix_fmt_id);
316  /* NOTE we do not allocate pictures large enough for the possible
317  * padding of h/v_count being 4 */
318  if (!(pix_fmt_id & 0xD0D0D0D0))
319  pix_fmt_id -= (pix_fmt_id & 0xF0F0F0F0) >> 1;
320  if (!(pix_fmt_id & 0x0D0D0D0D))
321  pix_fmt_id -= (pix_fmt_id & 0x0F0F0F0F) >> 1;
322 
323  switch (pix_fmt_id) {
324  case 0x11111100:
325  if (s->rgb)
326  s->avctx->pix_fmt = PIX_FMT_BGRA;
327  else
329  assert(s->nb_components == 3);
330  break;
331  case 0x11000000:
333  break;
334  case 0x12111100:
336  break;
337  case 0x21111100:
339  break;
340  case 0x22111100:
342  break;
343  default:
344  av_log(s->avctx, AV_LOG_ERROR, "Unhandled pixel format 0x%x\n", pix_fmt_id);
345  return -1;
346  }
347  if (s->ls) {
348  if (s->nb_components > 1)
350  else if (s->bits <= 8)
352  else
354  }
355 
356  if (s->picture_ptr->data[0])
358 
359  if (s->avctx->get_buffer(s->avctx, s->picture_ptr) < 0) {
360  av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
361  return -1;
362  }
364  s->picture_ptr->key_frame = 1;
365  s->got_picture = 1;
366 
367  for (i = 0; i < 3; i++)
368  s->linesize[i] = s->picture_ptr->linesize[i] << s->interlaced;
369 
370 // printf("%d %d %d %d %d %d\n",
371 // s->width, s->height, s->linesize[0], s->linesize[1],
372 // s->interlaced, s->avctx->height);
373 
374  if (len != (8 + (3 * nb_components)))
375  av_log(s->avctx, AV_LOG_DEBUG, "decode_sof0: error, len(%d) mismatch\n", len);
376  }
377 
378  /* totally blank picture as progressive JPEG will only add details to it */
379  if (s->progressive) {
380  int bw = (width + s->h_max * 8 - 1) / (s->h_max * 8);
381  int bh = (height + s->v_max * 8 - 1) / (s->v_max * 8);
382  for (i = 0; i < s->nb_components; i++) {
383  int size = bw * bh * s->h_count[i] * s->v_count[i];
384  av_freep(&s->blocks[i]);
385  av_freep(&s->last_nnz[i]);
386  s->blocks[i] = av_malloc(size * sizeof(**s->blocks));
387  s->last_nnz[i] = av_mallocz(size * sizeof(**s->last_nnz));
388  s->block_stride[i] = bw * s->h_count[i];
389  }
390  memset(s->coefs_finished, 0, sizeof(s->coefs_finished));
391  }
392  return 0;
393 }
394 
395 static inline int mjpeg_decode_dc(MJpegDecodeContext *s, int dc_index)
396 {
397  int code;
398  code = get_vlc2(&s->gb, s->vlcs[0][dc_index].table, 9, 2);
399  if (code < 0) {
401  "mjpeg_decode_dc: bad vlc: %d:%d (%p)\n",
402  0, dc_index, &s->vlcs[0][dc_index]);
403  return 0xffff;
404  }
405 
406  if (code)
407  return get_xbits(&s->gb, code);
408  else
409  return 0;
410 }
411 
412 /* decode block and dequantize */
413 static int decode_block(MJpegDecodeContext *s, DCTELEM *block, int component,
414  int dc_index, int ac_index, int16_t *quant_matrix)
415 {
416  int code, i, j, level, val;
417 
418  /* DC coef */
419  val = mjpeg_decode_dc(s, dc_index);
420  if (val == 0xffff) {
421  av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
422  return -1;
423  }
424  val = val * quant_matrix[0] + s->last_dc[component];
425  s->last_dc[component] = val;
426  block[0] = val;
427  /* AC coefs */
428  i = 0;
429  {OPEN_READER(re, &s->gb);
430  do {
431  UPDATE_CACHE(re, &s->gb);
432  GET_VLC(code, re, &s->gb, s->vlcs[1][ac_index].table, 9, 2);
433 
434  i += ((unsigned)code) >> 4;
435  code &= 0xf;
436  if (code) {
437  if (code > MIN_CACHE_BITS - 16)
438  UPDATE_CACHE(re, &s->gb);
439 
440  {
441  int cache = GET_CACHE(re, &s->gb);
442  int sign = (~cache) >> 31;
443  level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
444  }
445 
446  LAST_SKIP_BITS(re, &s->gb, code);
447 
448  if (i > 63) {
449  av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
450  return -1;
451  }
452  j = s->scantable.permutated[i];
453  block[j] = level * quant_matrix[j];
454  }
455  } while (i < 63);
456  CLOSE_READER(re, &s->gb);}
457 
458  return 0;
459 }
460 
462  int component, int dc_index,
463  int16_t *quant_matrix, int Al)
464 {
465  int val;
466  s->dsp.clear_block(block);
467  val = mjpeg_decode_dc(s, dc_index);
468  if (val == 0xffff) {
469  av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
470  return -1;
471  }
472  val = (val * quant_matrix[0] << Al) + s->last_dc[component];
473  s->last_dc[component] = val;
474  block[0] = val;
475  return 0;
476 }
477 
478 /* decode block and dequantize - progressive JPEG version */
480  uint8_t *last_nnz, int ac_index,
481  int16_t *quant_matrix,
482  int ss, int se, int Al, int *EOBRUN)
483 {
484  int code, i, j, level, val, run;
485 
486  if (*EOBRUN) {
487  (*EOBRUN)--;
488  return 0;
489  }
490 
491  {
492  OPEN_READER(re, &s->gb);
493  for (i = ss; ; i++) {
494  UPDATE_CACHE(re, &s->gb);
495  GET_VLC(code, re, &s->gb, s->vlcs[2][ac_index].table, 9, 2);
496 
497  run = ((unsigned) code) >> 4;
498  code &= 0xF;
499  if (code) {
500  i += run;
501  if (code > MIN_CACHE_BITS - 16)
502  UPDATE_CACHE(re, &s->gb);
503 
504  {
505  int cache = GET_CACHE(re, &s->gb);
506  int sign = (~cache) >> 31;
507  level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
508  }
509 
510  LAST_SKIP_BITS(re, &s->gb, code);
511 
512  if (i >= se) {
513  if (i == se) {
514  j = s->scantable.permutated[se];
515  block[j] = level * quant_matrix[j] << Al;
516  break;
517  }
518  av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
519  return -1;
520  }
521  j = s->scantable.permutated[i];
522  block[j] = level * quant_matrix[j] << Al;
523  } else {
524  if (run == 0xF) {// ZRL - skip 15 coefficients
525  i += 15;
526  if (i >= se) {
527  av_log(s->avctx, AV_LOG_ERROR, "ZRL overflow: %d\n", i);
528  return -1;
529  }
530  } else {
531  val = (1 << run);
532  if (run) {
533  UPDATE_CACHE(re, &s->gb);
534  val += NEG_USR32(GET_CACHE(re, &s->gb), run);
535  LAST_SKIP_BITS(re, &s->gb, run);
536  }
537  *EOBRUN = val - 1;
538  break;
539  }
540  }
541  }
542  CLOSE_READER(re, &s->gb);
543  }
544 
545  if (i > *last_nnz)
546  *last_nnz = i;
547 
548  return 0;
549 }
550 
551 #define REFINE_BIT(j) { \
552  UPDATE_CACHE(re, &s->gb); \
553  sign = block[j] >> 15; \
554  block[j] += SHOW_UBITS(re, &s->gb, 1) * \
555  ((quant_matrix[j] ^ sign) - sign) << Al; \
556  LAST_SKIP_BITS(re, &s->gb, 1); \
557 }
558 
559 #define ZERO_RUN \
560 for (; ; i++) { \
561  if (i > last) { \
562  i += run; \
563  if (i > se) { \
564  av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i); \
565  return -1; \
566  } \
567  break; \
568  } \
569  j = s->scantable.permutated[i]; \
570  if (block[j]) \
571  REFINE_BIT(j) \
572  else if (run-- == 0) \
573  break; \
574 }
575 
576 /* decode block and dequantize - progressive JPEG refinement pass */
578  uint8_t *last_nnz,
579  int ac_index, int16_t *quant_matrix,
580  int ss, int se, int Al, int *EOBRUN)
581 {
582  int code, i = ss, j, sign, val, run;
583  int last = FFMIN(se, *last_nnz);
584 
585  OPEN_READER(re, &s->gb);
586  if (*EOBRUN) {
587  (*EOBRUN)--;
588  } else {
589  for (; ; i++) {
590  UPDATE_CACHE(re, &s->gb);
591  GET_VLC(code, re, &s->gb, s->vlcs[2][ac_index].table, 9, 2);
592 
593  if (code & 0xF) {
594  run = ((unsigned) code) >> 4;
595  UPDATE_CACHE(re, &s->gb);
596  val = SHOW_UBITS(re, &s->gb, 1);
597  LAST_SKIP_BITS(re, &s->gb, 1);
598  ZERO_RUN;
599  j = s->scantable.permutated[i];
600  val--;
601  block[j] = ((quant_matrix[j]^val) - val) << Al;
602  if (i == se) {
603  if (i > *last_nnz)
604  *last_nnz = i;
605  CLOSE_READER(re, &s->gb);
606  return 0;
607  }
608  } else {
609  run = ((unsigned) code) >> 4;
610  if (run == 0xF) {
611  ZERO_RUN;
612  } else {
613  val = run;
614  run = (1 << run);
615  if (val) {
616  UPDATE_CACHE(re, &s->gb);
617  run += SHOW_UBITS(re, &s->gb, val);
618  LAST_SKIP_BITS(re, &s->gb, val);
619  }
620  *EOBRUN = run - 1;
621  break;
622  }
623  }
624  }
625 
626  if (i > *last_nnz)
627  *last_nnz = i;
628  }
629 
630  for (; i <= last; i++) {
631  j = s->scantable.permutated[i];
632  if (block[j])
633  REFINE_BIT(j)
634  }
635  CLOSE_READER(re, &s->gb);
636 
637  return 0;
638 }
639 #undef REFINE_BIT
640 #undef ZERO_RUN
641 
642 static int ljpeg_decode_rgb_scan(MJpegDecodeContext *s, int predictor,
643  int point_transform)
644 {
645  int i, mb_x, mb_y;
646  uint16_t (*buffer)[4];
647  int left[3], top[3], topleft[3];
648  const int linesize = s->linesize[0];
649  const int mask = (1 << s->bits) - 1;
650 
652  (unsigned)s->mb_width * 4 * sizeof(s->ljpeg_buffer[0][0]));
653  buffer = s->ljpeg_buffer;
654 
655  for (i = 0; i < 3; i++)
656  buffer[0][i] = 1 << (s->bits + point_transform - 1);
657 
658  for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
659  const int modified_predictor = mb_y ? predictor : 1;
660  uint8_t *ptr = s->picture_ptr->data[0] + (linesize * mb_y);
661 
662  if (s->interlaced && s->bottom_field)
663  ptr += linesize >> 1;
664 
665  for (i = 0; i < 3; i++)
666  top[i] = left[i] = topleft[i] = buffer[0][i];
667 
668  for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
669  if (s->restart_interval && !s->restart_count)
671 
672  for (i = 0; i < 3; i++) {
673  int pred;
674 
675  topleft[i] = top[i];
676  top[i] = buffer[mb_x][i];
677 
678  PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
679 
680  left[i] = buffer[mb_x][i] =
681  mask & (pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform));
682  }
683 
684  if (s->restart_interval && !--s->restart_count) {
685  align_get_bits(&s->gb);
686  skip_bits(&s->gb, 16); /* skip RSTn */
687  }
688  }
689 
690  if (s->rct) {
691  for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
692  ptr[4 * mb_x + 1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2] - 0x200) >> 2);
693  ptr[4 * mb_x + 0] = buffer[mb_x][1] + ptr[4 * mb_x + 1];
694  ptr[4 * mb_x + 2] = buffer[mb_x][2] + ptr[4 * mb_x + 1];
695  }
696  } else if (s->pegasus_rct) {
697  for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
698  ptr[4 * mb_x + 1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2]) >> 2);
699  ptr[4 * mb_x + 0] = buffer[mb_x][1] + ptr[4 * mb_x + 1];
700  ptr[4 * mb_x + 2] = buffer[mb_x][2] + ptr[4 * mb_x + 1];
701  }
702  } else {
703  for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
704  ptr[4 * mb_x + 0] = buffer[mb_x][2];
705  ptr[4 * mb_x + 1] = buffer[mb_x][1];
706  ptr[4 * mb_x + 2] = buffer[mb_x][0];
707  }
708  }
709  }
710  return 0;
711 }
712 
713 static int ljpeg_decode_yuv_scan(MJpegDecodeContext *s, int predictor,
714  int point_transform)
715 {
716  int i, mb_x, mb_y;
717  const int nb_components = 3;
718 
719  for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
720  for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
721  if (s->restart_interval && !s->restart_count)
723 
724  if (mb_x == 0 || mb_y == 0 || s->interlaced) {
725  for (i = 0; i < nb_components; i++) {
726  uint8_t *ptr;
727  int n, h, v, x, y, c, j, linesize;
728  n = s->nb_blocks[i];
729  c = s->comp_index[i];
730  h = s->h_scount[i];
731  v = s->v_scount[i];
732  x = 0;
733  y = 0;
734  linesize = s->linesize[c];
735 
736  for (j = 0; j < n; j++) {
737  int pred;
738  // FIXME optimize this crap
739  ptr = s->picture_ptr->data[c] +
740  (linesize * (v * mb_y + y)) +
741  (h * mb_x + x);
742  if (y == 0 && mb_y == 0) {
743  if (x == 0 && mb_x == 0)
744  pred = 128 << point_transform;
745  else
746  pred = ptr[-1];
747  } else {
748  if (x == 0 && mb_x == 0)
749  pred = ptr[-linesize];
750  else
751  PREDICT(pred, ptr[-linesize - 1],
752  ptr[-linesize], ptr[-1], predictor);
753  }
754 
755  if (s->interlaced && s->bottom_field)
756  ptr += linesize >> 1;
757  *ptr = pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform);
758 
759  if (++x == h) {
760  x = 0;
761  y++;
762  }
763  }
764  }
765  } else {
766  for (i = 0; i < nb_components; i++) {
767  uint8_t *ptr;
768  int n, h, v, x, y, c, j, linesize;
769  n = s->nb_blocks[i];
770  c = s->comp_index[i];
771  h = s->h_scount[i];
772  v = s->v_scount[i];
773  x = 0;
774  y = 0;
775  linesize = s->linesize[c];
776 
777  for (j = 0; j < n; j++) {
778  int pred;
779 
780  // FIXME optimize this crap
781  ptr = s->picture_ptr->data[c] +
782  (linesize * (v * mb_y + y)) +
783  (h * mb_x + x);
784  PREDICT(pred, ptr[-linesize - 1],
785  ptr[-linesize], ptr[-1], predictor);
786  *ptr = pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform);
787  if (++x == h) {
788  x = 0;
789  y++;
790  }
791  }
792  }
793  }
794  if (s->restart_interval && !--s->restart_count) {
795  align_get_bits(&s->gb);
796  skip_bits(&s->gb, 16); /* skip RSTn */
797  }
798  }
799  }
800  return 0;
801 }
802 
803 static av_always_inline void mjpeg_copy_block(uint8_t *dst, const uint8_t *src,
804  int linesize, int lowres)
805 {
806  switch (lowres) {
807  case 0: copy_block8(dst, src, linesize, linesize, 8);
808  break;
809  case 1: copy_block4(dst, src, linesize, linesize, 4);
810  break;
811  case 2: copy_block2(dst, src, linesize, linesize, 2);
812  break;
813  case 3: *dst = *src;
814  break;
815  }
816 }
817 
818 static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int Ah,
819  int Al, const uint8_t *mb_bitmask,
820  const AVFrame *reference)
821 {
822  int i, mb_x, mb_y;
823  uint8_t *data[MAX_COMPONENTS];
824  const uint8_t *reference_data[MAX_COMPONENTS];
825  int linesize[MAX_COMPONENTS];
826  GetBitContext mb_bitmask_gb;
827 
828  if (mb_bitmask)
829  init_get_bits(&mb_bitmask_gb, mb_bitmask, s->mb_width * s->mb_height);
830 
831  if (s->flipped && s->avctx->flags & CODEC_FLAG_EMU_EDGE) {
833  "Can not flip image with CODEC_FLAG_EMU_EDGE set!\n");
834  s->flipped = 0;
835  }
836 
837  for (i = 0; i < nb_components; i++) {
838  int c = s->comp_index[i];
839  data[c] = s->picture_ptr->data[c];
840  reference_data[c] = reference ? reference->data[c] : NULL;
841  linesize[c] = s->linesize[c];
842  s->coefs_finished[c] |= 1;
843  if (s->flipped) {
844  // picture should be flipped upside-down for this codec
845  int offset = (linesize[c] * (s->v_scount[i] *
846  (8 * s->mb_height - ((s->height / s->v_max) & 7)) - 1));
847  data[c] += offset;
848  reference_data[c] += offset;
849  linesize[c] *= -1;
850  }
851  }
852 
853  for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
854  for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
855  const int copy_mb = mb_bitmask && !get_bits1(&mb_bitmask_gb);
856 
857  if (s->restart_interval && !s->restart_count)
859 
860  if (get_bits_left(&s->gb) < 0) {
861  av_log(s->avctx, AV_LOG_ERROR, "overread %d\n",
862  -get_bits_left(&s->gb));
863  return -1;
864  }
865  for (i = 0; i < nb_components; i++) {
866  uint8_t *ptr;
867  int n, h, v, x, y, c, j;
868  int block_offset;
869  n = s->nb_blocks[i];
870  c = s->comp_index[i];
871  h = s->h_scount[i];
872  v = s->v_scount[i];
873  x = 0;
874  y = 0;
875  for (j = 0; j < n; j++) {
876  block_offset = (((linesize[c] * (v * mb_y + y) * 8) +
877  (h * mb_x + x) * 8) >> s->avctx->lowres);
878 
879  if (s->interlaced && s->bottom_field)
880  block_offset += linesize[c] >> 1;
881  ptr = data[c] + block_offset;
882  if (!s->progressive) {
883  if (copy_mb)
884  mjpeg_copy_block(ptr, reference_data[c] + block_offset,
885  linesize[c], s->avctx->lowres);
886  else {
887  s->dsp.clear_block(s->block);
888  if (decode_block(s, s->block, i,
889  s->dc_index[i], s->ac_index[i],
890  s->quant_matrixes[s->quant_index[c]]) < 0) {
892  "error y=%d x=%d\n", mb_y, mb_x);
893  return -1;
894  }
895  s->dsp.idct_put(ptr, linesize[c], s->block);
896  }
897  } else {
898  int block_idx = s->block_stride[c] * (v * mb_y + y) +
899  (h * mb_x + x);
900  DCTELEM *block = s->blocks[c][block_idx];
901  if (Ah)
902  block[0] += get_bits1(&s->gb) *
903  s->quant_matrixes[s->quant_index[c]][0] << Al;
904  else if (decode_dc_progressive(s, block, i, s->dc_index[i],
905  s->quant_matrixes[s->quant_index[c]],
906  Al) < 0) {
908  "error y=%d x=%d\n", mb_y, mb_x);
909  return -1;
910  }
911  }
912  // av_log(s->avctx, AV_LOG_DEBUG, "mb: %d %d processed\n",
913  // mb_y, mb_x);
914  // av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d %d %d %d %d \n",
915  // mb_x, mb_y, x, y, c, s->bottom_field,
916  // (v * mb_y + y) * 8, (h * mb_x + x) * 8);
917  if (++x == h) {
918  x = 0;
919  y++;
920  }
921  }
922  }
923 
924  if (s->restart_interval) {
925  s->restart_count--;
926  i = 8 + ((-get_bits_count(&s->gb)) & 7);
927  /* skip RSTn */
928  if (show_bits(&s->gb, i) == (1 << i) - 1) {
929  int pos = get_bits_count(&s->gb);
930  align_get_bits(&s->gb);
931  while (get_bits_left(&s->gb) >= 8 && show_bits(&s->gb, 8) == 0xFF)
932  skip_bits(&s->gb, 8);
933  if ((get_bits(&s->gb, 8) & 0xF8) == 0xD0) {
934  for (i = 0; i < nb_components; i++) /* reset dc */
935  s->last_dc[i] = 1024;
936  } else
937  skip_bits_long(&s->gb, pos - get_bits_count(&s->gb));
938  }
939  }
940  }
941  }
942  return 0;
943 }
944 
946  int se, int Ah, int Al,
947  const uint8_t *mb_bitmask,
948  const AVFrame *reference)
949 {
950  int mb_x, mb_y;
951  int EOBRUN = 0;
952  int c = s->comp_index[0];
953  uint8_t *data = s->picture_ptr->data[c];
954  const uint8_t *reference_data = reference ? reference->data[c] : NULL;
955  int linesize = s->linesize[c];
956  int last_scan = 0;
957  int16_t *quant_matrix = s->quant_matrixes[s->quant_index[c]];
958  GetBitContext mb_bitmask_gb;
959 
960  if (mb_bitmask)
961  init_get_bits(&mb_bitmask_gb, mb_bitmask, s->mb_width * s->mb_height);
962 
963  if (!Al) {
964  s->coefs_finished[c] |= (1LL << (se + 1)) - (1LL << ss);
965  last_scan = !~s->coefs_finished[c];
966  }
967 
968  if (s->interlaced && s->bottom_field) {
969  int offset = linesize >> 1;
970  data += offset;
971  reference_data += offset;
972  }
973 
974  for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
975  int block_offset = (mb_y * linesize * 8 >> s->avctx->lowres);
976  uint8_t *ptr = data + block_offset;
977  int block_idx = mb_y * s->block_stride[c];
978  DCTELEM (*block)[64] = &s->blocks[c][block_idx];
979  uint8_t *last_nnz = &s->last_nnz[c][block_idx];
980  for (mb_x = 0; mb_x < s->mb_width; mb_x++, block++, last_nnz++) {
981  const int copy_mb = mb_bitmask && !get_bits1(&mb_bitmask_gb);
982 
983  if (!copy_mb) {
984  int ret;
985  if (Ah)
986  ret = decode_block_refinement(s, *block, last_nnz, s->ac_index[0],
987  quant_matrix, ss, se, Al, &EOBRUN);
988  else
989  ret = decode_block_progressive(s, *block, last_nnz, s->ac_index[0],
990  quant_matrix, ss, se, Al, &EOBRUN);
991  if (ret < 0) {
993  "error y=%d x=%d\n", mb_y, mb_x);
994  return -1;
995  }
996  }
997 
998  if (last_scan) {
999  if (copy_mb) {
1000  mjpeg_copy_block(ptr, reference_data + block_offset,
1001  linesize, s->avctx->lowres);
1002  } else {
1003  s->dsp.idct_put(ptr, linesize, *block);
1004  ptr += 8 >> s->avctx->lowres;
1005  }
1006  }
1007  }
1008  }
1009  return 0;
1010 }
1011 
1012 int ff_mjpeg_decode_sos(MJpegDecodeContext *s, const uint8_t *mb_bitmask,
1013  const AVFrame *reference)
1014 {
1015  int len, nb_components, i, h, v, predictor, point_transform;
1016  int index, id;
1017  const int block_size = s->lossless ? 1 : 8;
1018  int ilv, prev_shift;
1019 
1020  /* XXX: verify len field validity */
1021  len = get_bits(&s->gb, 16);
1022  nb_components = get_bits(&s->gb, 8);
1023  if (nb_components == 0 || nb_components > MAX_COMPONENTS) {
1025  "decode_sos: nb_components (%d) unsupported\n", nb_components);
1026  return -1;
1027  }
1028  if (len != 6 + 2 * nb_components) {
1029  av_log(s->avctx, AV_LOG_ERROR, "decode_sos: invalid len (%d)\n", len);
1030  return -1;
1031  }
1032  for (i = 0; i < nb_components; i++) {
1033  id = get_bits(&s->gb, 8) - 1;
1034  av_log(s->avctx, AV_LOG_DEBUG, "component: %d\n", id);
1035  /* find component index */
1036  for (index = 0; index < s->nb_components; index++)
1037  if (id == s->component_id[index])
1038  break;
1039  if (index == s->nb_components) {
1041  "decode_sos: index(%d) out of components\n", index);
1042  return -1;
1043  }
1044  /* Metasoft MJPEG codec has Cb and Cr swapped */
1045  if (s->avctx->codec_tag == MKTAG('M', 'T', 'S', 'J')
1046  && nb_components == 3 && s->nb_components == 3 && i)
1047  index = 3 - i;
1048 
1049  s->comp_index[i] = index;
1050 
1051  s->nb_blocks[i] = s->h_count[index] * s->v_count[index];
1052  s->h_scount[i] = s->h_count[index];
1053  s->v_scount[i] = s->v_count[index];
1054 
1055  s->dc_index[i] = get_bits(&s->gb, 4);
1056  s->ac_index[i] = get_bits(&s->gb, 4);
1057 
1058  if (s->dc_index[i] < 0 || s->ac_index[i] < 0 ||
1059  s->dc_index[i] >= 4 || s->ac_index[i] >= 4)
1060  goto out_of_range;
1061  if (!s->vlcs[0][s->dc_index[i]].table ||
1062  !s->vlcs[1][s->ac_index[i]].table)
1063  goto out_of_range;
1064  }
1065 
1066  predictor = get_bits(&s->gb, 8); /* JPEG Ss / lossless JPEG predictor /JPEG-LS NEAR */
1067  ilv = get_bits(&s->gb, 8); /* JPEG Se / JPEG-LS ILV */
1068  prev_shift = get_bits(&s->gb, 4); /* Ah */
1069  point_transform = get_bits(&s->gb, 4); /* Al */
1070 
1071  for (i = 0; i < nb_components; i++)
1072  s->last_dc[i] = 1024;
1073 
1074  if (nb_components > 1) {
1075  /* interleaved stream */
1076  s->mb_width = (s->width + s->h_max * block_size - 1) / (s->h_max * block_size);
1077  s->mb_height = (s->height + s->v_max * block_size - 1) / (s->v_max * block_size);
1078  } else if (!s->ls) { /* skip this for JPEG-LS */
1079  h = s->h_max / s->h_scount[0];
1080  v = s->v_max / s->v_scount[0];
1081  s->mb_width = (s->width + h * block_size - 1) / (h * block_size);
1082  s->mb_height = (s->height + v * block_size - 1) / (v * block_size);
1083  s->nb_blocks[0] = 1;
1084  s->h_scount[0] = 1;
1085  s->v_scount[0] = 1;
1086  }
1087 
1088  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1089  av_log(s->avctx, AV_LOG_DEBUG, "%s %s p:%d >>:%d ilv:%d bits:%d %s\n",
1090  s->lossless ? "lossless" : "sequential DCT", s->rgb ? "RGB" : "",
1091  predictor, point_transform, ilv, s->bits,
1092  s->pegasus_rct ? "PRCT" : (s->rct ? "RCT" : ""));
1093 
1094 
1095  /* mjpeg-b can have padding bytes between sos and image data, skip them */
1096  for (i = s->mjpb_skiptosod; i > 0; i--)
1097  skip_bits(&s->gb, 8);
1098 
1099  if (s->lossless) {
1100  if (CONFIG_JPEGLS_DECODER && s->ls) {
1101 // for () {
1102 // reset_ls_coding_parameters(s, 0);
1103 
1104  if (ff_jpegls_decode_picture(s, predictor, point_transform, ilv) < 0)
1105  return -1;
1106  } else {
1107  if (s->rgb) {
1108  if (ljpeg_decode_rgb_scan(s, predictor, point_transform) < 0)
1109  return -1;
1110  } else {
1111  if (ljpeg_decode_yuv_scan(s, predictor, point_transform) < 0)
1112  return -1;
1113  }
1114  }
1115  } else {
1116  if (s->progressive && predictor) {
1117  if (mjpeg_decode_scan_progressive_ac(s, predictor, ilv, prev_shift,
1118  point_transform,
1119  mb_bitmask, reference) < 0)
1120  return -1;
1121  } else {
1122  if (mjpeg_decode_scan(s, nb_components, prev_shift, point_transform,
1123  mb_bitmask, reference) < 0)
1124  return -1;
1125  }
1126  }
1127  emms_c();
1128  return 0;
1129  out_of_range:
1130  av_log(s->avctx, AV_LOG_ERROR, "decode_sos: ac/dc index out of range\n");
1131  return -1;
1132 }
1133 
1135 {
1136  if (get_bits(&s->gb, 16) != 4)
1137  return -1;
1138  s->restart_interval = get_bits(&s->gb, 16);
1139  s->restart_count = 0;
1140  av_log(s->avctx, AV_LOG_DEBUG, "restart interval: %d\n",
1141  s->restart_interval);
1142 
1143  return 0;
1144 }
1145 
1147 {
1148  int len, id, i;
1149 
1150  len = get_bits(&s->gb, 16);
1151  if (len < 5)
1152  return -1;
1153  if (8 * len > get_bits_left(&s->gb))
1154  return -1;
1155 
1156  id = get_bits_long(&s->gb, 32);
1157  id = av_be2ne32(id);
1158  len -= 6;
1159 
1160  if (s->avctx->debug & FF_DEBUG_STARTCODE)
1161  av_log(s->avctx, AV_LOG_DEBUG, "APPx %8X\n", id);
1162 
1163  /* Buggy AVID, it puts EOI only at every 10th frame. */
1164  /* Also, this fourcc is used by non-avid files too, it holds some
1165  information, but it's always present in AVID-created files. */
1166  if (id == AV_RL32("AVI1")) {
1167  /* structure:
1168  4bytes AVI1
1169  1bytes polarity
1170  1bytes always zero
1171  4bytes field_size
1172  4bytes field_size_less_padding
1173  */
1174  s->buggy_avid = 1;
1175 // if (s->first_picture)
1176 // printf("mjpeg: workarounding buggy AVID\n");
1177  i = get_bits(&s->gb, 8);
1178  if (i == 2)
1179  s->bottom_field = 1;
1180  else if (i == 1)
1181  s->bottom_field = 0;
1182 #if 0
1183  skip_bits(&s->gb, 8);
1184  skip_bits(&s->gb, 32);
1185  skip_bits(&s->gb, 32);
1186  len -= 10;
1187 #endif
1188 // if (s->interlace_polarity)
1189 // printf("mjpeg: interlace polarity: %d\n", s->interlace_polarity);
1190  goto out;
1191  }
1192 
1193 // len -= 2;
1194 
1195  if (id == AV_RL32("JFIF")) {
1196  int t_w, t_h, v1, v2;
1197  skip_bits(&s->gb, 8); /* the trailing zero-byte */
1198  v1 = get_bits(&s->gb, 8);
1199  v2 = get_bits(&s->gb, 8);
1200  skip_bits(&s->gb, 8);
1201 
1202  s->avctx->sample_aspect_ratio.num = get_bits(&s->gb, 16);
1203  s->avctx->sample_aspect_ratio.den = get_bits(&s->gb, 16);
1204 
1205  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1206  av_log(s->avctx, AV_LOG_INFO,
1207  "mjpeg: JFIF header found (version: %x.%x) SAR=%d/%d\n",
1208  v1, v2,
1211 
1212  t_w = get_bits(&s->gb, 8);
1213  t_h = get_bits(&s->gb, 8);
1214  if (t_w && t_h) {
1215  /* skip thumbnail */
1216  if (len -10 - (t_w * t_h * 3) > 0)
1217  len -= t_w * t_h * 3;
1218  }
1219  len -= 10;
1220  goto out;
1221  }
1222 
1223  if (id == AV_RL32("Adob") && (get_bits(&s->gb, 8) == 'e')) {
1224  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1225  av_log(s->avctx, AV_LOG_INFO, "mjpeg: Adobe header found\n");
1226  skip_bits(&s->gb, 16); /* version */
1227  skip_bits(&s->gb, 16); /* flags0 */
1228  skip_bits(&s->gb, 16); /* flags1 */
1229  skip_bits(&s->gb, 8); /* transform */
1230  len -= 7;
1231  goto out;
1232  }
1233 
1234  if (id == AV_RL32("LJIF")) {
1235  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1236  av_log(s->avctx, AV_LOG_INFO,
1237  "Pegasus lossless jpeg header found\n");
1238  skip_bits(&s->gb, 16); /* version ? */
1239  skip_bits(&s->gb, 16); /* unknwon always 0? */
1240  skip_bits(&s->gb, 16); /* unknwon always 0? */
1241  skip_bits(&s->gb, 16); /* unknwon always 0? */
1242  switch (get_bits(&s->gb, 8)) {
1243  case 1:
1244  s->rgb = 1;
1245  s->pegasus_rct = 0;
1246  break;
1247  case 2:
1248  s->rgb = 1;
1249  s->pegasus_rct = 1;
1250  break;
1251  default:
1252  av_log(s->avctx, AV_LOG_ERROR, "unknown colorspace\n");
1253  }
1254  len -= 9;
1255  goto out;
1256  }
1257 
1258  /* Apple MJPEG-A */
1259  if ((s->start_code == APP1) && (len > (0x28 - 8))) {
1260  id = get_bits_long(&s->gb, 32);
1261  id = av_be2ne32(id);
1262  len -= 4;
1263  /* Apple MJPEG-A */
1264  if (id == AV_RL32("mjpg")) {
1265 #if 0
1266  skip_bits(&s->gb, 32); /* field size */
1267  skip_bits(&s->gb, 32); /* pad field size */
1268  skip_bits(&s->gb, 32); /* next off */
1269  skip_bits(&s->gb, 32); /* quant off */
1270  skip_bits(&s->gb, 32); /* huff off */
1271  skip_bits(&s->gb, 32); /* image off */
1272  skip_bits(&s->gb, 32); /* scan off */
1273  skip_bits(&s->gb, 32); /* data off */
1274 #endif
1275  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1276  av_log(s->avctx, AV_LOG_INFO, "mjpeg: Apple MJPEG-A header found\n");
1277  }
1278  }
1279 
1280 out:
1281  /* slow but needed for extreme adobe jpegs */
1282  if (len < 0)
1284  "mjpeg: error, decode_app parser read over the end\n");
1285  while (--len > 0)
1286  skip_bits(&s->gb, 8);
1287 
1288  return 0;
1289 }
1290 
1292 {
1293  int len = get_bits(&s->gb, 16);
1294  if (len >= 2 && 8 * len - 16 <= get_bits_left(&s->gb)) {
1295  char *cbuf = av_malloc(len - 1);
1296  if (cbuf) {
1297  int i;
1298  for (i = 0; i < len - 2; i++)
1299  cbuf[i] = get_bits(&s->gb, 8);
1300  if (i > 0 && cbuf[i - 1] == '\n')
1301  cbuf[i - 1] = 0;
1302  else
1303  cbuf[i] = 0;
1304 
1305  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1306  av_log(s->avctx, AV_LOG_INFO, "mjpeg comment: '%s'\n", cbuf);
1307 
1308  /* buggy avid, it puts EOI only at every 10th frame */
1309  if (!strcmp(cbuf, "AVID")) {
1310  s->buggy_avid = 1;
1311  // if (s->first_picture)
1312  // printf("mjpeg: workarounding buggy AVID\n");
1313  } else if (!strcmp(cbuf, "CS=ITU601"))
1314  s->cs_itu601 = 1;
1315  else if ((len > 20 && !strncmp(cbuf, "Intel(R) JPEG Library", 21)) ||
1316  (len > 19 && !strncmp(cbuf, "Metasoft MJPEG Codec", 20)))
1317  s->flipped = 1;
1318 
1319  av_free(cbuf);
1320  }
1321  }
1322 
1323  return 0;
1324 }
1325 
1326 /* return the 8 bit start code value and update the search
1327  state. Return -1 if no start code found */
1328 static int find_marker(const uint8_t **pbuf_ptr, const uint8_t *buf_end)
1329 {
1330  const uint8_t *buf_ptr;
1331  unsigned int v, v2;
1332  int val;
1333 #ifdef DEBUG
1334  int skipped = 0;
1335 #endif
1336 
1337  buf_ptr = *pbuf_ptr;
1338  while (buf_ptr < buf_end) {
1339  v = *buf_ptr++;
1340  v2 = *buf_ptr;
1341  if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe) && buf_ptr < buf_end) {
1342  val = *buf_ptr++;
1343  goto found;
1344  }
1345 #ifdef DEBUG
1346  skipped++;
1347 #endif
1348  }
1349  val = -1;
1350 found:
1351  av_dlog(NULL, "find_marker skipped %d bytes\n", skipped);
1352  *pbuf_ptr = buf_ptr;
1353  return val;
1354 }
1355 
1357  const uint8_t **buf_ptr, const uint8_t *buf_end,
1358  const uint8_t **unescaped_buf_ptr,
1359  int *unescaped_buf_size)
1360 {
1361  int start_code;
1362  start_code = find_marker(buf_ptr, buf_end);
1363 
1364  if ((buf_end - *buf_ptr) > s->buffer_size) {
1365  av_free(s->buffer);
1366  s->buffer_size = buf_end - *buf_ptr;
1369  "buffer too small, expanding to %d bytes\n", s->buffer_size);
1370  }
1371 
1372  /* unescape buffer of SOS, use special treatment for JPEG-LS */
1373  if (start_code == SOS && !s->ls) {
1374  const uint8_t *src = *buf_ptr;
1375  uint8_t *dst = s->buffer;
1376 
1377  while (src < buf_end) {
1378  uint8_t x = *(src++);
1379 
1380  *(dst++) = x;
1381  if (s->avctx->codec_id != CODEC_ID_THP) {
1382  if (x == 0xff) {
1383  while (src < buf_end && x == 0xff)
1384  x = *(src++);
1385 
1386  if (x >= 0xd0 && x <= 0xd7)
1387  *(dst++) = x;
1388  else if (x)
1389  break;
1390  }
1391  }
1392  }
1393  *unescaped_buf_ptr = s->buffer;
1394  *unescaped_buf_size = dst - s->buffer;
1395 
1396  av_log(s->avctx, AV_LOG_DEBUG, "escaping removed %td bytes\n",
1397  (buf_end - *buf_ptr) - (dst - s->buffer));
1398  } else if (start_code == SOS && s->ls) {
1399  const uint8_t *src = *buf_ptr;
1400  uint8_t *dst = s->buffer;
1401  int bit_count = 0;
1402  int t = 0, b = 0;
1403  PutBitContext pb;
1404 
1405  s->cur_scan++;
1406 
1407  /* find marker */
1408  while (src + t < buf_end) {
1409  uint8_t x = src[t++];
1410  if (x == 0xff) {
1411  while ((src + t < buf_end) && x == 0xff)
1412  x = src[t++];
1413  if (x & 0x80) {
1414  t -= 2;
1415  break;
1416  }
1417  }
1418  }
1419  bit_count = t * 8;
1420  init_put_bits(&pb, dst, t);
1421 
1422  /* unescape bitstream */
1423  while (b < t) {
1424  uint8_t x = src[b++];
1425  put_bits(&pb, 8, x);
1426  if (x == 0xFF) {
1427  x = src[b++];
1428  put_bits(&pb, 7, x);
1429  bit_count--;
1430  }
1431  }
1432  flush_put_bits(&pb);
1433 
1434  *unescaped_buf_ptr = dst;
1435  *unescaped_buf_size = (bit_count + 7) >> 3;
1436  } else {
1437  *unescaped_buf_ptr = *buf_ptr;
1438  *unescaped_buf_size = buf_end - *buf_ptr;
1439  }
1440 
1441  return start_code;
1442 }
1443 
1444 int ff_mjpeg_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
1445  AVPacket *avpkt)
1446 {
1447  const uint8_t *buf = avpkt->data;
1448  int buf_size = avpkt->size;
1449  MJpegDecodeContext *s = avctx->priv_data;
1450  const uint8_t *buf_end, *buf_ptr;
1451  const uint8_t *unescaped_buf_ptr;
1452  int unescaped_buf_size;
1453  int start_code;
1454  AVFrame *picture = data;
1455 
1456  s->got_picture = 0; // picture from previous image can not be reused
1457  buf_ptr = buf;
1458  buf_end = buf + buf_size;
1459  while (buf_ptr < buf_end) {
1460  /* find start next marker */
1461  start_code = ff_mjpeg_find_marker(s, &buf_ptr, buf_end,
1462  &unescaped_buf_ptr,
1463  &unescaped_buf_size);
1464  /* EOF */
1465  if (start_code < 0) {
1466  goto the_end;
1467  } else if (unescaped_buf_size > (1U<<29)) {
1468  av_log(avctx, AV_LOG_ERROR, "MJPEG packet 0x%x too big (0x%x/0x%x), corrupt data?\n",
1469  start_code, unescaped_buf_ptr, buf_size);
1470  return AVERROR_INVALIDDATA;
1471  } else {
1472  av_log(avctx, AV_LOG_DEBUG, "marker=%x avail_size_in_buf=%td\n",
1473  start_code, buf_end - buf_ptr);
1474 
1475  init_get_bits(&s->gb, unescaped_buf_ptr, unescaped_buf_size * 8);
1476 
1477  s->start_code = start_code;
1478  if (s->avctx->debug & FF_DEBUG_STARTCODE)
1479  av_log(avctx, AV_LOG_DEBUG, "startcode: %X\n", start_code);
1480 
1481  /* process markers */
1482  if (start_code >= 0xd0 && start_code <= 0xd7)
1483  av_log(avctx, AV_LOG_DEBUG,
1484  "restart marker: %d\n", start_code & 0x0f);
1485  /* APP fields */
1486  else if (start_code >= APP0 && start_code <= APP15)
1487  mjpeg_decode_app(s);
1488  /* Comment */
1489  else if (start_code == COM)
1490  mjpeg_decode_com(s);
1491 
1492  switch (start_code) {
1493  case SOI:
1494  s->restart_interval = 0;
1495  s->restart_count = 0;
1496  /* nothing to do on SOI */
1497  break;
1498  case DQT:
1500  break;
1501  case DHT:
1502  if (ff_mjpeg_decode_dht(s) < 0) {
1503  av_log(avctx, AV_LOG_ERROR, "huffman table decode error\n");
1504  return -1;
1505  }
1506  break;
1507  case SOF0:
1508  case SOF1:
1509  s->lossless = 0;
1510  s->ls = 0;
1511  s->progressive = 0;
1512  if (ff_mjpeg_decode_sof(s) < 0)
1513  return -1;
1514  break;
1515  case SOF2:
1516  s->lossless = 0;
1517  s->ls = 0;
1518  s->progressive = 1;
1519  if (ff_mjpeg_decode_sof(s) < 0)
1520  return -1;
1521  break;
1522  case SOF3:
1523  s->lossless = 1;
1524  s->ls = 0;
1525  s->progressive = 0;
1526  if (ff_mjpeg_decode_sof(s) < 0)
1527  return -1;
1528  break;
1529  case SOF48:
1530  s->lossless = 1;
1531  s->ls = 1;
1532  s->progressive = 0;
1533  if (ff_mjpeg_decode_sof(s) < 0)
1534  return -1;
1535  break;
1536  case LSE:
1538  return -1;
1539  break;
1540  case EOI:
1541  s->cur_scan = 0;
1542  if ((s->buggy_avid && !s->interlaced) || s->restart_interval)
1543  break;
1544 eoi_parser:
1545  if (!s->got_picture) {
1546  av_log(avctx, AV_LOG_WARNING,
1547  "Found EOI before any SOF, ignoring\n");
1548  break;
1549  }
1550  if (s->interlaced) {
1551  s->bottom_field ^= 1;
1552  /* if not bottom field, do not output image yet */
1553  if (s->bottom_field == !s->interlace_polarity)
1554  goto not_the_end;
1555  }
1556  *picture = *s->picture_ptr;
1557  *data_size = sizeof(AVFrame);
1558 
1559  if (!s->lossless) {
1560  picture->quality = FFMAX3(s->qscale[0],
1561  s->qscale[1],
1562  s->qscale[2]);
1563  picture->qstride = 0;
1564  picture->qscale_table = s->qscale_table;
1565  memset(picture->qscale_table, picture->quality,
1566  (s->width + 15) / 16);
1567  if (avctx->debug & FF_DEBUG_QP)
1568  av_log(avctx, AV_LOG_DEBUG,
1569  "QP: %d\n", picture->quality);
1570  picture->quality *= FF_QP2LAMBDA;
1571  }
1572 
1573  goto the_end;
1574  case SOS:
1575  if (!s->got_picture) {
1576  av_log(avctx, AV_LOG_WARNING,
1577  "Can not process SOS before SOF, skipping\n");
1578  break;
1579  }
1580  if (ff_mjpeg_decode_sos(s, NULL, NULL) < 0 &&
1581  (avctx->err_recognition & AV_EF_EXPLODE))
1582  return AVERROR_INVALIDDATA;
1583  /* buggy avid puts EOI every 10-20th frame */
1584  /* if restart period is over process EOI */
1585  if ((s->buggy_avid && !s->interlaced) || s->restart_interval)
1586  goto eoi_parser;
1587  break;
1588  case DRI:
1589  mjpeg_decode_dri(s);
1590  break;
1591  case SOF5:
1592  case SOF6:
1593  case SOF7:
1594  case SOF9:
1595  case SOF10:
1596  case SOF11:
1597  case SOF13:
1598  case SOF14:
1599  case SOF15:
1600  case JPG:
1601  av_log(avctx, AV_LOG_ERROR,
1602  "mjpeg: unsupported coding type (%x)\n", start_code);
1603  break;
1604 // default:
1605 // printf("mjpeg: unsupported marker (%x)\n", start_code);
1606 // break;
1607  }
1608 
1609 not_the_end:
1610  /* eof process start code */
1611  buf_ptr += (get_bits_count(&s->gb) + 7) / 8;
1612  av_log(avctx, AV_LOG_DEBUG,
1613  "marker parser used %d bytes (%d bits)\n",
1614  (get_bits_count(&s->gb) + 7) / 8, get_bits_count(&s->gb));
1615  }
1616  }
1617  if (s->got_picture) {
1618  av_log(avctx, AV_LOG_WARNING, "EOI missing, emulating\n");
1619  goto eoi_parser;
1620  }
1621  av_log(avctx, AV_LOG_FATAL, "No JPEG data found in image\n");
1622  return -1;
1623 the_end:
1624  av_log(avctx, AV_LOG_DEBUG, "mjpeg decode frame unused %td bytes\n",
1625  buf_end - buf_ptr);
1626 // return buf_end - buf_ptr;
1627  return buf_ptr - buf;
1628 }
1629 
1631 {
1632  MJpegDecodeContext *s = avctx->priv_data;
1633  int i, j;
1634 
1635  if (s->picture_ptr && s->picture_ptr->data[0])
1636  avctx->release_buffer(avctx, s->picture_ptr);
1637 
1638  av_free(s->buffer);
1639  av_free(s->qscale_table);
1640  av_freep(&s->ljpeg_buffer);
1641  s->ljpeg_buffer_size = 0;
1642 
1643  for (i = 0; i < 3; i++) {
1644  for (j = 0; j < 4; j++)
1645  free_vlc(&s->vlcs[i][j]);
1646  }
1647  for (i = 0; i < MAX_COMPONENTS; i++) {
1648  av_freep(&s->blocks[i]);
1649  av_freep(&s->last_nnz[i]);
1650  }
1651  return 0;
1652 }
1653 
1654 #define OFFSET(x) offsetof(MJpegDecodeContext, x)
1655 #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
1656 static const AVOption options[] = {
1657  { "extern_huff", "Use external huffman table.",
1658  OFFSET(extern_huff), AV_OPT_TYPE_INT, { 0 }, 0, 1, VD },
1659  { NULL },
1660 };
1661 
1662 static const AVClass mjpegdec_class = {
1663  .class_name = "MJPEG decoder",
1664  .item_name = av_default_item_name,
1665  .option = options,
1666  .version = LIBAVUTIL_VERSION_INT,
1667 };
1668 
1670  .name = "mjpeg",
1671  .type = AVMEDIA_TYPE_VIDEO,
1672  .id = CODEC_ID_MJPEG,
1673  .priv_data_size = sizeof(MJpegDecodeContext),
1677  .capabilities = CODEC_CAP_DR1,
1678  .max_lowres = 3,
1679  .long_name = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),
1680  .priv_class = &mjpegdec_class,
1681 };
1682 
1684  .name = "thp",
1685  .type = AVMEDIA_TYPE_VIDEO,
1686  .id = CODEC_ID_THP,
1687  .priv_data_size = sizeof(MJpegDecodeContext),
1691  .capabilities = CODEC_CAP_DR1,
1692  .max_lowres = 3,
1693  .long_name = NULL_IF_CONFIG_SMALL("Nintendo Gamecube THP video"),
1694 };