FFmpeg  1.2.4
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 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 
33 #include "libavutil/imgutils.h"
34 #include "libavutil/avassert.h"
35 #include "libavutil/opt.h"
36 #include "avcodec.h"
37 #include "copy_block.h"
38 #include "internal.h"
39 #include "mjpeg.h"
40 #include "mjpegdec.h"
41 #include "jpeglsdec.h"
42 
43 
44 static int build_vlc(VLC *vlc, const uint8_t *bits_table,
45  const uint8_t *val_table, int nb_codes,
46  int use_static, int is_ac)
47 {
48  uint8_t huff_size[256] = { 0 };
49  uint16_t huff_code[256];
50  uint16_t huff_sym[256];
51  int i;
52 
53  av_assert0(nb_codes <= 256);
54 
55  ff_mjpeg_build_huffman_codes(huff_size, huff_code, bits_table, val_table);
56 
57  for (i = 0; i < 256; i++)
58  huff_sym[i] = i + 16 * is_ac;
59 
60  if (is_ac)
61  huff_sym[0] = 16 * 256;
62 
63  return ff_init_vlc_sparse(vlc, 9, nb_codes, huff_size, 1, 1,
64  huff_code, 2, 2, huff_sym, 2, 2, use_static);
65 }
66 
68 {
70  avpriv_mjpeg_val_dc, 12, 0, 0);
72  avpriv_mjpeg_val_dc, 12, 0, 0);
81 }
82 
84 {
85  MJpegDecodeContext *s = avctx->priv_data;
86 
87  if (!s->picture_ptr)
88  s->picture_ptr = &s->picture;
90 
91  s->avctx = avctx;
92  ff_dsputil_init(&s->dsp, avctx);
94  s->buffer_size = 0;
95  s->buffer = NULL;
96  s->start_code = -1;
97  s->first_picture = 1;
98  s->got_picture = 0;
99  s->org_height = avctx->coded_height;
101 
103 
104  if (s->extern_huff) {
105  av_log(avctx, AV_LOG_INFO, "using external huffman table\n");
106  init_get_bits(&s->gb, avctx->extradata, avctx->extradata_size * 8);
107  if (ff_mjpeg_decode_dht(s)) {
108  av_log(avctx, AV_LOG_ERROR,
109  "error using external huffman table, switching back to internal\n");
111  }
112  }
113  if (avctx->field_order == AV_FIELD_BB) { /* quicktime icefloe 019 */
114  s->interlace_polarity = 1; /* bottom field first */
115  av_log(avctx, AV_LOG_DEBUG, "bottom field first\n");
116  }
117  if (avctx->codec->id == AV_CODEC_ID_AMV)
118  s->flipped = 1;
119 
120  return 0;
121 }
122 
123 
124 /* quantize tables */
126 {
127  int len, index, i, j;
128 
129  len = get_bits(&s->gb, 16) - 2;
130 
131  while (len >= 65) {
132  int pr = get_bits(&s->gb, 4);
133  if (pr > 1) {
134  av_log(s->avctx, AV_LOG_ERROR, "dqt: invalid precision\n");
135  return AVERROR_INVALIDDATA;
136  }
137  index = get_bits(&s->gb, 4);
138  if (index >= 4)
139  return -1;
140  av_log(s->avctx, AV_LOG_DEBUG, "index=%d\n", index);
141  /* read quant table */
142  for (i = 0; i < 64; i++) {
143  j = s->scantable.permutated[i];
144  s->quant_matrixes[index][j] = get_bits(&s->gb, pr ? 16 : 8);
145  }
146 
147  // XXX FIXME finetune, and perhaps add dc too
148  s->qscale[index] = FFMAX(s->quant_matrixes[index][s->scantable.permutated[1]],
149  s->quant_matrixes[index][s->scantable.permutated[8]]) >> 1;
150  av_log(s->avctx, AV_LOG_DEBUG, "qscale[%d]: %d\n",
151  index, s->qscale[index]);
152  len -= 65;
153  }
154  return 0;
155 }
156 
157 /* decode huffman tables and build VLC decoders */
159 {
160  int len, index, i, class, n, v, code_max;
161  uint8_t bits_table[17];
162  uint8_t val_table[256];
163  int ret = 0;
164 
165  len = get_bits(&s->gb, 16) - 2;
166 
167  while (len > 0) {
168  if (len < 17)
169  return AVERROR_INVALIDDATA;
170  class = get_bits(&s->gb, 4);
171  if (class >= 2)
172  return AVERROR_INVALIDDATA;
173  index = get_bits(&s->gb, 4);
174  if (index >= 4)
175  return AVERROR_INVALIDDATA;
176  n = 0;
177  for (i = 1; i <= 16; i++) {
178  bits_table[i] = get_bits(&s->gb, 8);
179  n += bits_table[i];
180  }
181  len -= 17;
182  if (len < n || n > 256)
183  return AVERROR_INVALIDDATA;
184 
185  code_max = 0;
186  for (i = 0; i < n; i++) {
187  v = get_bits(&s->gb, 8);
188  if (v > code_max)
189  code_max = v;
190  val_table[i] = v;
191  }
192  len -= n;
193 
194  /* build VLC and flush previous vlc if present */
195  ff_free_vlc(&s->vlcs[class][index]);
196  av_log(s->avctx, AV_LOG_DEBUG, "class=%d index=%d nb_codes=%d\n",
197  class, index, code_max + 1);
198  if ((ret = build_vlc(&s->vlcs[class][index], bits_table, val_table,
199  code_max + 1, 0, class > 0)) < 0)
200  return ret;
201 
202  if (class > 0) {
203  ff_free_vlc(&s->vlcs[2][index]);
204  if ((ret = build_vlc(&s->vlcs[2][index], bits_table, val_table,
205  code_max + 1, 0, 0)) < 0)
206  return ret;
207  }
208  }
209  return 0;
210 }
211 
213 {
214  int len, nb_components, i, width, height, pix_fmt_id;
215  int h_count[MAX_COMPONENTS];
216  int v_count[MAX_COMPONENTS];
217 
218  s->cur_scan = 0;
219  s->upscale_h = s->upscale_v = 0;
220 
221  /* XXX: verify len field validity */
222  len = get_bits(&s->gb, 16);
223  s->bits = get_bits(&s->gb, 8);
224 
225  if (s->pegasus_rct)
226  s->bits = 9;
227  if (s->bits == 9 && !s->pegasus_rct)
228  s->rct = 1; // FIXME ugly
229 
230  if (s->bits != 8 && !s->lossless) {
231  av_log(s->avctx, AV_LOG_ERROR, "only 8 bits/component accepted\n");
232  return -1;
233  }
234 
235  if(s->lossless && s->avctx->lowres){
236  av_log(s->avctx, AV_LOG_ERROR, "lowres is not possible with lossless jpeg\n");
237  return -1;
238  }
239 
240  height = get_bits(&s->gb, 16);
241  width = get_bits(&s->gb, 16);
242 
243  // HACK for odd_height.mov
244  if (s->interlaced && s->width == width && s->height == height + 1)
245  height= s->height;
246 
247  av_log(s->avctx, AV_LOG_DEBUG, "sof0: picture: %dx%d\n", width, height);
248  if (av_image_check_size(width, height, 0, s->avctx))
249  return AVERROR_INVALIDDATA;
250 
251  nb_components = get_bits(&s->gb, 8);
252  if (nb_components <= 0 ||
253  nb_components > MAX_COMPONENTS)
254  return -1;
255  if (s->interlaced && (s->bottom_field == !s->interlace_polarity)) {
256  if (nb_components != s->nb_components) {
257  av_log(s->avctx, AV_LOG_ERROR, "nb_components changing in interlaced picture\n");
258  return AVERROR_INVALIDDATA;
259  }
260  }
261  if (s->ls && !(s->bits <= 8 || nb_components == 1)) {
263  "For JPEG-LS anything except <= 8 bits/component"
264  " or 16-bit gray", 0);
265  return AVERROR_PATCHWELCOME;
266  }
267  s->nb_components = nb_components;
268  s->h_max = 1;
269  s->v_max = 1;
270  memset(h_count, 0, sizeof(h_count));
271  memset(v_count, 0, sizeof(v_count));
272  for (i = 0; i < nb_components; i++) {
273  /* component id */
274  s->component_id[i] = get_bits(&s->gb, 8) - 1;
275  h_count[i] = get_bits(&s->gb, 4);
276  v_count[i] = get_bits(&s->gb, 4);
277  /* compute hmax and vmax (only used in interleaved case) */
278  if (h_count[i] > s->h_max)
279  s->h_max = h_count[i];
280  if (v_count[i] > s->v_max)
281  s->v_max = v_count[i];
282  if (!h_count[i] || !v_count[i]) {
283  av_log(s->avctx, AV_LOG_ERROR, "h/v_count is 0\n");
284  return -1;
285  }
286  s->quant_index[i] = get_bits(&s->gb, 8);
287  if (s->quant_index[i] >= 4) {
288  av_log(s->avctx, AV_LOG_ERROR, "quant_index is invalid\n");
289  return AVERROR_INVALIDDATA;
290  }
291  av_log(s->avctx, AV_LOG_DEBUG, "component %d %d:%d id: %d quant:%d\n",
292  i, h_count[i], v_count[i],
293  s->component_id[i], s->quant_index[i]);
294  }
295 
296  if (s->ls && (s->h_max > 1 || s->v_max > 1)) {
297  av_log_missing_feature(s->avctx, "Subsampling in JPEG-LS", 0);
298  return AVERROR_PATCHWELCOME;
299  }
300 
301 
302  /* if different size, realloc/alloc picture */
303  if ( width != s->width || height != s->height
304  || memcmp(s->h_count, h_count, sizeof(h_count))
305  || memcmp(s->v_count, v_count, sizeof(v_count))) {
306  av_freep(&s->qscale_table);
307 
308  s->width = width;
309  s->height = height;
310  memcpy(s->h_count, h_count, sizeof(h_count));
311  memcpy(s->v_count, v_count, sizeof(v_count));
312  s->interlaced = 0;
313  s->got_picture = 0;
314 
315  /* test interlaced mode */
316  if (s->first_picture &&
317  s->org_height != 0 &&
318  s->height < ((s->org_height * 3) / 4)) {
319  s->interlaced = 1;
323  height *= 2;
324  }
325 
326  avcodec_set_dimensions(s->avctx, width, height);
327 
328  s->qscale_table = av_mallocz((s->width + 15) / 16);
329  s->first_picture = 0;
330  }
331 
332  if (s->interlaced && (s->bottom_field == !s->interlace_polarity)) {
333  if (s->progressive) {
334  av_log_ask_for_sample(s->avctx, "progressively coded interlaced pictures not supported\n");
335  return AVERROR_INVALIDDATA;
336  }
337  } else{
338  if (s->v_max == 1 && s->h_max == 1 && s->lossless==1 && nb_components==3)
339  s->rgb = 1;
340  else if (!s->lossless)
341  s->rgb = 0;
342  /* XXX: not complete test ! */
343  pix_fmt_id = (s->h_count[0] << 28) | (s->v_count[0] << 24) |
344  (s->h_count[1] << 20) | (s->v_count[1] << 16) |
345  (s->h_count[2] << 12) | (s->v_count[2] << 8) |
346  (s->h_count[3] << 4) | s->v_count[3];
347  av_log(s->avctx, AV_LOG_DEBUG, "pix fmt id %x\n", pix_fmt_id);
348  /* NOTE we do not allocate pictures large enough for the possible
349  * padding of h/v_count being 4 */
350  if (!(pix_fmt_id & 0xD0D0D0D0))
351  pix_fmt_id -= (pix_fmt_id & 0xF0F0F0F0) >> 1;
352  if (!(pix_fmt_id & 0x0D0D0D0D))
353  pix_fmt_id -= (pix_fmt_id & 0x0F0F0F0F) >> 1;
354 
355  switch (pix_fmt_id) {
356  case 0x11111100:
357  if (s->rgb)
359  else {
360  if (s->component_id[0] == 'Q' && s->component_id[1] == 'F' && s->component_id[2] == 'A') {
362  } else {
365  }
366  }
367  av_assert0(s->nb_components == 3);
368  break;
369  case 0x12121100:
370  case 0x22122100:
373  s->upscale_v = 2;
374  s->upscale_h = (pix_fmt_id == 0x22122100);
375  s->chroma_height = s->height;
376  break;
377  case 0x21211100:
378  case 0x22211200:
381  s->upscale_v = (pix_fmt_id == 0x22211200);
382  s->upscale_h = 2;
383  s->chroma_height = s->height;
384  break;
385  case 0x22221100:
388  s->upscale_v = 2;
389  s->upscale_h = 2;
390  s->chroma_height = s->height / 2;
391  break;
392  case 0x11000000:
393  case 0x13000000:
394  case 0x14000000:
395  case 0x31000000:
396  case 0x33000000:
397  case 0x34000000:
398  case 0x41000000:
399  case 0x43000000:
400  case 0x44000000:
401  if(s->bits <= 8)
403  else
405  break;
406  case 0x12111100:
407  case 0x22211100:
408  case 0x22112100:
411  s->upscale_h = (pix_fmt_id == 0x22211100) * 2 + (pix_fmt_id == 0x22112100);
412  s->chroma_height = s->height / 2;
413  break;
414  case 0x21111100:
417  break;
418  case 0x22121100:
419  case 0x22111200:
422  s->upscale_v = (pix_fmt_id == 0x22121100) + 1;
423  break;
424  case 0x22111100:
427  break;
428  default:
429  av_log(s->avctx, AV_LOG_ERROR, "Unhandled pixel format 0x%x\n", pix_fmt_id);
430  return AVERROR_PATCHWELCOME;
431  }
432  if ((s->upscale_h || s->upscale_v) && s->avctx->lowres) {
433  av_log(s->avctx, AV_LOG_ERROR, "lowres not supported for weird subsampling\n");
434  return AVERROR_PATCHWELCOME;
435  }
436  if (s->ls) {
437  s->upscale_h = s->upscale_v = 0;
438  if (s->nb_components > 1)
440  else if (s->bits <= 8)
442  else
444  }
445 
446  if (s->picture_ptr->data[0])
448 
449  if (ff_get_buffer(s->avctx, s->picture_ptr) < 0) {
450  av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
451  return -1;
452  }
454  s->picture_ptr->key_frame = 1;
455  s->got_picture = 1;
456 
457  for (i = 0; i < 3; i++)
458  s->linesize[i] = s->picture_ptr->linesize[i] << s->interlaced;
459 
460  av_dlog(s->avctx, "%d %d %d %d %d %d\n",
461  s->width, s->height, s->linesize[0], s->linesize[1],
462  s->interlaced, s->avctx->height);
463 
464  if (len != (8 + (3 * nb_components)))
465  av_log(s->avctx, AV_LOG_DEBUG, "decode_sof0: error, len(%d) mismatch\n", len);
466  }
467 
468  if (s->rgb && !s->lossless && !s->ls) {
469  av_log(s->avctx, AV_LOG_ERROR, "Unsupported coding and pixel format combination\n");
470  return AVERROR_PATCHWELCOME;
471  }
472 
473  /* totally blank picture as progressive JPEG will only add details to it */
474  if (s->progressive) {
475  int bw = (width + s->h_max * 8 - 1) / (s->h_max * 8);
476  int bh = (height + s->v_max * 8 - 1) / (s->v_max * 8);
477  for (i = 0; i < s->nb_components; i++) {
478  int size = bw * bh * s->h_count[i] * s->v_count[i];
479  av_freep(&s->blocks[i]);
480  av_freep(&s->last_nnz[i]);
481  s->blocks[i] = av_malloc(size * sizeof(**s->blocks));
482  s->last_nnz[i] = av_mallocz(size * sizeof(**s->last_nnz));
483  s->block_stride[i] = bw * s->h_count[i];
484  }
485  memset(s->coefs_finished, 0, sizeof(s->coefs_finished));
486  }
487  return 0;
488 }
489 
490 static inline int mjpeg_decode_dc(MJpegDecodeContext *s, int dc_index)
491 {
492  int code;
493  code = get_vlc2(&s->gb, s->vlcs[0][dc_index].table, 9, 2);
494  if (code < 0) {
496  "mjpeg_decode_dc: bad vlc: %d:%d (%p)\n",
497  0, dc_index, &s->vlcs[0][dc_index]);
498  return 0xffff;
499  }
500 
501  if (code)
502  return get_xbits(&s->gb, code);
503  else
504  return 0;
505 }
506 
507 /* decode block and dequantize */
508 static int decode_block(MJpegDecodeContext *s, int16_t *block, int component,
509  int dc_index, int ac_index, int16_t *quant_matrix)
510 {
511  int code, i, j, level, val;
512 
513  /* DC coef */
514  val = mjpeg_decode_dc(s, dc_index);
515  if (val == 0xffff) {
516  av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
517  return AVERROR_INVALIDDATA;
518  }
519  val = val * quant_matrix[0] + s->last_dc[component];
520  s->last_dc[component] = val;
521  block[0] = val;
522  /* AC coefs */
523  i = 0;
524  {OPEN_READER(re, &s->gb);
525  do {
526  UPDATE_CACHE(re, &s->gb);
527  GET_VLC(code, re, &s->gb, s->vlcs[1][ac_index].table, 9, 2);
528 
529  i += ((unsigned)code) >> 4;
530  code &= 0xf;
531  if (code) {
532  if (code > MIN_CACHE_BITS - 16)
533  UPDATE_CACHE(re, &s->gb);
534 
535  {
536  int cache = GET_CACHE(re, &s->gb);
537  int sign = (~cache) >> 31;
538  level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
539  }
540 
541  LAST_SKIP_BITS(re, &s->gb, code);
542 
543  if (i > 63) {
544  av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
545  return AVERROR_INVALIDDATA;
546  }
547  j = s->scantable.permutated[i];
548  block[j] = level * quant_matrix[j];
549  }
550  } while (i < 63);
551  CLOSE_READER(re, &s->gb);}
552 
553  return 0;
554 }
555 
557  int component, int dc_index,
558  int16_t *quant_matrix, int Al)
559 {
560  int val;
561  s->dsp.clear_block(block);
562  val = mjpeg_decode_dc(s, dc_index);
563  if (val == 0xffff) {
564  av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
565  return AVERROR_INVALIDDATA;
566  }
567  val = (val * quant_matrix[0] << Al) + s->last_dc[component];
568  s->last_dc[component] = val;
569  block[0] = val;
570  return 0;
571 }
572 
573 /* decode block and dequantize - progressive JPEG version */
575  uint8_t *last_nnz, int ac_index,
576  int16_t *quant_matrix,
577  int ss, int se, int Al, int *EOBRUN)
578 {
579  int code, i, j, level, val, run;
580 
581  if (*EOBRUN) {
582  (*EOBRUN)--;
583  return 0;
584  }
585 
586  {
587  OPEN_READER(re, &s->gb);
588  for (i = ss; ; i++) {
589  UPDATE_CACHE(re, &s->gb);
590  GET_VLC(code, re, &s->gb, s->vlcs[2][ac_index].table, 9, 2);
591 
592  run = ((unsigned) code) >> 4;
593  code &= 0xF;
594  if (code) {
595  i += run;
596  if (code > MIN_CACHE_BITS - 16)
597  UPDATE_CACHE(re, &s->gb);
598 
599  {
600  int cache = GET_CACHE(re, &s->gb);
601  int sign = (~cache) >> 31;
602  level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
603  }
604 
605  LAST_SKIP_BITS(re, &s->gb, code);
606 
607  if (i >= se) {
608  if (i == se) {
609  j = s->scantable.permutated[se];
610  block[j] = level * quant_matrix[j] << Al;
611  break;
612  }
613  av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
614  return AVERROR_INVALIDDATA;
615  }
616  j = s->scantable.permutated[i];
617  block[j] = level * quant_matrix[j] << Al;
618  } else {
619  if (run == 0xF) {// ZRL - skip 15 coefficients
620  i += 15;
621  if (i >= se) {
622  av_log(s->avctx, AV_LOG_ERROR, "ZRL overflow: %d\n", i);
623  return AVERROR_INVALIDDATA;
624  }
625  } else {
626  val = (1 << run);
627  if (run) {
628  UPDATE_CACHE(re, &s->gb);
629  val += NEG_USR32(GET_CACHE(re, &s->gb), run);
630  LAST_SKIP_BITS(re, &s->gb, run);
631  }
632  *EOBRUN = val - 1;
633  break;
634  }
635  }
636  }
637  CLOSE_READER(re, &s->gb);
638  }
639 
640  if (i > *last_nnz)
641  *last_nnz = i;
642 
643  return 0;
644 }
645 
646 #define REFINE_BIT(j) { \
647  UPDATE_CACHE(re, &s->gb); \
648  sign = block[j] >> 15; \
649  block[j] += SHOW_UBITS(re, &s->gb, 1) * \
650  ((quant_matrix[j] ^ sign) - sign) << Al; \
651  LAST_SKIP_BITS(re, &s->gb, 1); \
652 }
653 
654 #define ZERO_RUN \
655 for (; ; i++) { \
656  if (i > last) { \
657  i += run; \
658  if (i > se) { \
659  av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i); \
660  return -1; \
661  } \
662  break; \
663  } \
664  j = s->scantable.permutated[i]; \
665  if (block[j]) \
666  REFINE_BIT(j) \
667  else if (run-- == 0) \
668  break; \
669 }
670 
671 /* decode block and dequantize - progressive JPEG refinement pass */
673  uint8_t *last_nnz,
674  int ac_index, int16_t *quant_matrix,
675  int ss, int se, int Al, int *EOBRUN)
676 {
677  int code, i = ss, j, sign, val, run;
678  int last = FFMIN(se, *last_nnz);
679 
680  OPEN_READER(re, &s->gb);
681  if (*EOBRUN) {
682  (*EOBRUN)--;
683  } else {
684  for (; ; i++) {
685  UPDATE_CACHE(re, &s->gb);
686  GET_VLC(code, re, &s->gb, s->vlcs[2][ac_index].table, 9, 2);
687 
688  if (code & 0xF) {
689  run = ((unsigned) code) >> 4;
690  UPDATE_CACHE(re, &s->gb);
691  val = SHOW_UBITS(re, &s->gb, 1);
692  LAST_SKIP_BITS(re, &s->gb, 1);
693  ZERO_RUN;
694  j = s->scantable.permutated[i];
695  val--;
696  block[j] = ((quant_matrix[j]^val) - val) << Al;
697  if (i == se) {
698  if (i > *last_nnz)
699  *last_nnz = i;
700  CLOSE_READER(re, &s->gb);
701  return 0;
702  }
703  } else {
704  run = ((unsigned) code) >> 4;
705  if (run == 0xF) {
706  ZERO_RUN;
707  } else {
708  val = run;
709  run = (1 << run);
710  if (val) {
711  UPDATE_CACHE(re, &s->gb);
712  run += SHOW_UBITS(re, &s->gb, val);
713  LAST_SKIP_BITS(re, &s->gb, val);
714  }
715  *EOBRUN = run - 1;
716  break;
717  }
718  }
719  }
720 
721  if (i > *last_nnz)
722  *last_nnz = i;
723  }
724 
725  for (; i <= last; i++) {
726  j = s->scantable.permutated[i];
727  if (block[j])
728  REFINE_BIT(j)
729  }
730  CLOSE_READER(re, &s->gb);
731 
732  return 0;
733 }
734 #undef REFINE_BIT
735 #undef ZERO_RUN
736 
737 static void handle_rstn(MJpegDecodeContext *s, int nb_components)
738 {
739  int i;
740  if (s->restart_interval) {
741  s->restart_count--;
742  if(s->restart_count == 0 && s->avctx->codec_id == AV_CODEC_ID_THP){
743  align_get_bits(&s->gb);
744  for (i = 0; i < nb_components; i++) /* reset dc */
745  s->last_dc[i] = 1024;
746  }
747 
748  i = 8 + ((-get_bits_count(&s->gb)) & 7);
749  /* skip RSTn */
750  if (s->restart_count == 0) {
751  if( show_bits(&s->gb, i) == (1 << i) - 1
752  || show_bits(&s->gb, i) == 0xFF) {
753  int pos = get_bits_count(&s->gb);
754  align_get_bits(&s->gb);
755  while (get_bits_left(&s->gb) >= 8 && show_bits(&s->gb, 8) == 0xFF)
756  skip_bits(&s->gb, 8);
757  if (get_bits_left(&s->gb) >= 8 && (get_bits(&s->gb, 8) & 0xF8) == 0xD0) {
758  for (i = 0; i < nb_components; i++) /* reset dc */
759  s->last_dc[i] = 1024;
760  } else
761  skip_bits_long(&s->gb, pos - get_bits_count(&s->gb));
762  }
763  }
764  }
765 }
766 
767 static int ljpeg_decode_rgb_scan(MJpegDecodeContext *s, int nb_components, int predictor, int point_transform)
768 {
769  int i, mb_x, mb_y;
770  uint16_t (*buffer)[4];
771  int left[3], top[3], topleft[3];
772  const int linesize = s->linesize[0];
773  const int mask = (1 << s->bits) - 1;
774  int resync_mb_y = 0;
775  int resync_mb_x = 0;
776 
777  if (s->nb_components != 3 && s->nb_components != 4)
778  return AVERROR_INVALIDDATA;
779  if (s->v_max != 1 || s->h_max != 1 || !s->lossless)
780  return AVERROR_INVALIDDATA;
781 
782 
784 
786  (unsigned)s->mb_width * 4 * sizeof(s->ljpeg_buffer[0][0]));
787  buffer = s->ljpeg_buffer;
788 
789  for (i = 0; i < 3; i++)
790  buffer[0][i] = 1 << (s->bits - 1);
791 
792  for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
793  uint8_t *ptr = s->picture.data[0] + (linesize * mb_y);
794 
795  if (s->interlaced && s->bottom_field)
796  ptr += linesize >> 1;
797 
798  for (i = 0; i < 3; i++)
799  top[i] = left[i] = topleft[i] = buffer[0][i];
800 
801  for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
802  int modified_predictor = predictor;
803 
804  if (s->restart_interval && !s->restart_count){
806  resync_mb_x = mb_x;
807  resync_mb_y = mb_y;
808  for(i=0; i<3; i++)
809  top[i] = left[i]= topleft[i]= 1 << (s->bits - 1);
810  }
811  if (mb_y == resync_mb_y || mb_y == resync_mb_y+1 && mb_x < resync_mb_x || !mb_x)
812  modified_predictor = 1;
813 
814  for (i=0;i<nb_components;i++) {
815  int pred, dc;
816 
817  topleft[i] = top[i];
818  top[i] = buffer[mb_x][i];
819 
820  PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
821 
822  dc = mjpeg_decode_dc(s, s->dc_index[i]);
823  if(dc == 0xFFFF)
824  return -1;
825 
826  left[i] = buffer[mb_x][i] =
827  mask & (pred + (dc << point_transform));
828  }
829 
830  if (s->restart_interval && !--s->restart_count) {
831  align_get_bits(&s->gb);
832  skip_bits(&s->gb, 16); /* skip RSTn */
833  }
834  }
835 
836  if (s->rct) {
837  for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
838  ptr[3*mb_x + 1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2] - 0x200) >> 2);
839  ptr[3*mb_x + 0] = buffer[mb_x][1] + ptr[3*mb_x + 1];
840  ptr[3*mb_x + 2] = buffer[mb_x][2] + ptr[3*mb_x + 1];
841  }
842  } else if (s->pegasus_rct) {
843  for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
844  ptr[3*mb_x + 1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2]) >> 2);
845  ptr[3*mb_x + 0] = buffer[mb_x][1] + ptr[3*mb_x + 1];
846  ptr[3*mb_x + 2] = buffer[mb_x][2] + ptr[3*mb_x + 1];
847  }
848  } else {
849  for(i=0; i<nb_components; i++) {
850  int c= s->comp_index[i];
851  for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
852  ptr[3*mb_x+2-c] = buffer[mb_x][i];
853  }
854  }
855  }
856  }
857  return 0;
858 }
859 
860 static int ljpeg_decode_yuv_scan(MJpegDecodeContext *s, int nb_components, int predictor,
861  int point_transform)
862 {
863  int i, mb_x, mb_y;
864  int bits= (s->bits+7)&~7;
865  int resync_mb_y = 0;
866  int resync_mb_x = 0;
867 
868  point_transform += bits - s->bits;
869 
870  av_assert0(nb_components>=1 && nb_components<=3);
871 
872  for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
873  for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
874  if (s->restart_interval && !s->restart_count){
876  resync_mb_x = mb_x;
877  resync_mb_y = mb_y;
878  }
879 
880  if(!mb_x || mb_y == resync_mb_y || mb_y == resync_mb_y+1 && mb_x < resync_mb_x || s->interlaced){
881  int toprow = mb_y == resync_mb_y || mb_y == resync_mb_y+1 && mb_x < resync_mb_x;
882  int leftcol = !mb_x || mb_y == resync_mb_y && mb_x == resync_mb_x;
883  for (i = 0; i < nb_components; i++) {
884  uint8_t *ptr;
885  uint16_t *ptr16;
886  int n, h, v, x, y, c, j, linesize;
887  n = s->nb_blocks[i];
888  c = s->comp_index[i];
889  h = s->h_scount[i];
890  v = s->v_scount[i];
891  x = 0;
892  y = 0;
893  linesize= s->linesize[c];
894 
895  if(bits>8) linesize /= 2;
896 
897  for(j=0; j<n; j++) {
898  int pred, dc;
899 
900  dc = mjpeg_decode_dc(s, s->dc_index[i]);
901  if(dc == 0xFFFF)
902  return -1;
903  if(bits<=8){
904  ptr = s->picture.data[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
905  if(y==0 && toprow){
906  if(x==0 && leftcol){
907  pred= 1 << (bits - 1);
908  }else{
909  pred= ptr[-1];
910  }
911  }else{
912  if(x==0 && leftcol){
913  pred= ptr[-linesize];
914  }else{
915  PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
916  }
917  }
918 
919  if (s->interlaced && s->bottom_field)
920  ptr += linesize >> 1;
921  pred &= (-1)<<(8-s->bits);
922  *ptr= pred + (dc << point_transform);
923  }else{
924  ptr16 = (uint16_t*)(s->picture.data[c] + 2*(linesize * (v * mb_y + y)) + 2*(h * mb_x + x)); //FIXME optimize this crap
925  if(y==0 && toprow){
926  if(x==0 && leftcol){
927  pred= 1 << (bits - 1);
928  }else{
929  pred= ptr16[-1];
930  }
931  }else{
932  if(x==0 && leftcol){
933  pred= ptr16[-linesize];
934  }else{
935  PREDICT(pred, ptr16[-linesize-1], ptr16[-linesize], ptr16[-1], predictor);
936  }
937  }
938 
939  if (s->interlaced && s->bottom_field)
940  ptr16 += linesize >> 1;
941  pred &= (-1)<<(16-s->bits);
942  *ptr16= pred + (dc << point_transform);
943  }
944  if (++x == h) {
945  x = 0;
946  y++;
947  }
948  }
949  }
950  } else {
951  for (i = 0; i < nb_components; i++) {
952  uint8_t *ptr;
953  uint16_t *ptr16;
954  int n, h, v, x, y, c, j, linesize, dc;
955  n = s->nb_blocks[i];
956  c = s->comp_index[i];
957  h = s->h_scount[i];
958  v = s->v_scount[i];
959  x = 0;
960  y = 0;
961  linesize = s->linesize[c];
962 
963  if(bits>8) linesize /= 2;
964 
965  for (j = 0; j < n; j++) {
966  int pred;
967 
968  dc = mjpeg_decode_dc(s, s->dc_index[i]);
969  if(dc == 0xFFFF)
970  return -1;
971  if(bits<=8){
972  ptr = s->picture.data[c] +
973  (linesize * (v * mb_y + y)) +
974  (h * mb_x + x); //FIXME optimize this crap
975  PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
976 
977  pred &= (-1)<<(8-s->bits);
978  *ptr = pred + (dc << point_transform);
979  }else{
980  ptr16 = (uint16_t*)(s->picture.data[c] + 2*(linesize * (v * mb_y + y)) + 2*(h * mb_x + x)); //FIXME optimize this crap
981  PREDICT(pred, ptr16[-linesize-1], ptr16[-linesize], ptr16[-1], predictor);
982 
983  pred &= (-1)<<(16-s->bits);
984  *ptr16= pred + (dc << point_transform);
985  }
986 
987  if (++x == h) {
988  x = 0;
989  y++;
990  }
991  }
992  }
993  }
994  if (s->restart_interval && !--s->restart_count) {
995  align_get_bits(&s->gb);
996  skip_bits(&s->gb, 16); /* skip RSTn */
997  }
998  }
999  }
1000  return 0;
1001 }
1002 
1004  uint8_t *dst, const uint8_t *src,
1005  int linesize, int lowres)
1006 {
1007  switch (lowres) {
1008  case 0: s->dsp.put_pixels_tab[1][0](dst, src, linesize, 8);
1009  break;
1010  case 1: copy_block4(dst, src, linesize, linesize, 4);
1011  break;
1012  case 2: copy_block2(dst, src, linesize, linesize, 2);
1013  break;
1014  case 3: *dst = *src;
1015  break;
1016  }
1017 }
1018 
1019 static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int Ah,
1020  int Al, const uint8_t *mb_bitmask,
1021  const AVFrame *reference)
1022 {
1023  int i, mb_x, mb_y;
1025  const uint8_t *reference_data[MAX_COMPONENTS];
1026  int linesize[MAX_COMPONENTS];
1027  GetBitContext mb_bitmask_gb;
1028 
1029  if (mb_bitmask)
1030  init_get_bits(&mb_bitmask_gb, mb_bitmask, s->mb_width * s->mb_height);
1031 
1032  if (s->flipped && s->avctx->lowres) {
1033  av_log(s->avctx, AV_LOG_ERROR, "Can not flip image with lowres\n");
1034  s->flipped = 0;
1035  }
1036 
1037  for (i = 0; i < nb_components; i++) {
1038  int c = s->comp_index[i];
1039  data[c] = s->picture_ptr->data[c];
1040  reference_data[c] = reference ? reference->data[c] : NULL;
1041  linesize[c] = s->linesize[c];
1042  s->coefs_finished[c] |= 1;
1043  if (s->flipped && !(s->avctx->flags & CODEC_FLAG_EMU_EDGE)) {
1044  // picture should be flipped upside-down for this codec
1045  int offset = (linesize[c] * (s->v_scount[i] *
1046  (8 * s->mb_height - ((s->height / s->v_max) & 7)) - 1));
1047  data[c] += offset;
1048  reference_data[c] += offset;
1049  linesize[c] *= -1;
1050  }
1051  }
1052 
1053  for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
1054  for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
1055  const int copy_mb = mb_bitmask && !get_bits1(&mb_bitmask_gb);
1056 
1057  if (s->restart_interval && !s->restart_count)
1059 
1060  if (get_bits_left(&s->gb) < 0) {
1061  av_log(s->avctx, AV_LOG_ERROR, "overread %d\n",
1062  -get_bits_left(&s->gb));
1063  return AVERROR_INVALIDDATA;
1064  }
1065  for (i = 0; i < nb_components; i++) {
1066  uint8_t *ptr;
1067  int n, h, v, x, y, c, j;
1068  int block_offset;
1069  n = s->nb_blocks[i];
1070  c = s->comp_index[i];
1071  h = s->h_scount[i];
1072  v = s->v_scount[i];
1073  x = 0;
1074  y = 0;
1075  for (j = 0; j < n; j++) {
1076  block_offset = (((linesize[c] * (v * mb_y + y) * 8) +
1077  (h * mb_x + x) * 8) >> s->avctx->lowres);
1078 
1079  if (s->interlaced && s->bottom_field)
1080  block_offset += linesize[c] >> 1;
1081  ptr = data[c] + block_offset;
1082  if (!s->progressive) {
1083  if (copy_mb)
1084  mjpeg_copy_block(s, ptr, reference_data[c] + block_offset,
1085  linesize[c], s->avctx->lowres);
1086 
1087  else {
1088  s->dsp.clear_block(s->block);
1089  if (decode_block(s, s->block, i,
1090  s->dc_index[i], s->ac_index[i],
1091  s->quant_matrixes[s->quant_index[c]]) < 0) {
1093  "error y=%d x=%d\n", mb_y, mb_x);
1094  return AVERROR_INVALIDDATA;
1095  }
1096  s->dsp.idct_put(ptr, linesize[c], s->block);
1097  }
1098  } else {
1099  int block_idx = s->block_stride[c] * (v * mb_y + y) +
1100  (h * mb_x + x);
1101  int16_t *block = s->blocks[c][block_idx];
1102  if (Ah)
1103  block[0] += get_bits1(&s->gb) *
1104  s->quant_matrixes[s->quant_index[c]][0] << Al;
1105  else if (decode_dc_progressive(s, block, i, s->dc_index[i],
1106  s->quant_matrixes[s->quant_index[c]],
1107  Al) < 0) {
1109  "error y=%d x=%d\n", mb_y, mb_x);
1110  return AVERROR_INVALIDDATA;
1111  }
1112  }
1113  av_dlog(s->avctx, "mb: %d %d processed\n", mb_y, mb_x);
1114  av_dlog(s->avctx, "%d %d %d %d %d %d %d %d \n",
1115  mb_x, mb_y, x, y, c, s->bottom_field,
1116  (v * mb_y + y) * 8, (h * mb_x + x) * 8);
1117  if (++x == h) {
1118  x = 0;
1119  y++;
1120  }
1121  }
1122  }
1123 
1124  handle_rstn(s, nb_components);
1125  }
1126  }
1127  return 0;
1128 }
1129 
1131  int se, int Ah, int Al)
1132 {
1133  int mb_x, mb_y;
1134  int EOBRUN = 0;
1135  int c = s->comp_index[0];
1136  uint8_t *data = s->picture.data[c];
1137  int linesize = s->linesize[c];
1138  int last_scan = 0;
1139  int16_t *quant_matrix = s->quant_matrixes[s->quant_index[c]];
1140 
1141  if (se > 63) {
1142  av_log(s->avctx, AV_LOG_ERROR, "SE %d is too large\n", se);
1143  return AVERROR_INVALIDDATA;
1144  }
1145 
1146  if (!Al) {
1147  s->coefs_finished[c] |= (1LL << (se + 1)) - (1LL << ss);
1148  last_scan = !~s->coefs_finished[c];
1149  }
1150 
1151  if (s->interlaced && s->bottom_field)
1152  data += linesize >> 1;
1153 
1154  s->restart_count = 0;
1155 
1156  for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
1157  uint8_t *ptr = data + (mb_y * linesize * 8 >> s->avctx->lowres);
1158  int block_idx = mb_y * s->block_stride[c];
1159  int16_t (*block)[64] = &s->blocks[c][block_idx];
1160  uint8_t *last_nnz = &s->last_nnz[c][block_idx];
1161  for (mb_x = 0; mb_x < s->mb_width; mb_x++, block++, last_nnz++) {
1162  int ret;
1163  if (s->restart_interval && !s->restart_count)
1165 
1166  if (Ah)
1167  ret = decode_block_refinement(s, *block, last_nnz, s->ac_index[0],
1168  quant_matrix, ss, se, Al, &EOBRUN);
1169  else
1170  ret = decode_block_progressive(s, *block, last_nnz, s->ac_index[0],
1171  quant_matrix, ss, se, Al, &EOBRUN);
1172  if (ret < 0) {
1174  "error y=%d x=%d\n", mb_y, mb_x);
1175  return AVERROR_INVALIDDATA;
1176  }
1177 
1178  if (last_scan) {
1179  s->dsp.idct_put(ptr, linesize, *block);
1180  ptr += 8 >> s->avctx->lowres;
1181  }
1182  handle_rstn(s, 0);
1183  }
1184  }
1185  return 0;
1186 }
1187 
1189  const AVFrame *reference)
1190 {
1191  int len, nb_components, i, h, v, predictor, point_transform;
1192  int index, id, ret;
1193  const int block_size = s->lossless ? 1 : 8;
1194  int ilv, prev_shift;
1195 
1196  if (!s->got_picture) {
1198  "Can not process SOS before SOF, skipping\n");
1199  return -1;
1200  }
1201 
1202  av_assert0(s->picture_ptr->data[0]);
1203  /* XXX: verify len field validity */
1204  len = get_bits(&s->gb, 16);
1205  nb_components = get_bits(&s->gb, 8);
1206  if (nb_components == 0 || nb_components > MAX_COMPONENTS) {
1208  "decode_sos: nb_components (%d) unsupported\n", nb_components);
1209  return AVERROR_PATCHWELCOME;
1210  }
1211  if (len != 6 + 2 * nb_components) {
1212  av_log(s->avctx, AV_LOG_ERROR, "decode_sos: invalid len (%d)\n", len);
1213  return AVERROR_INVALIDDATA;
1214  }
1215  for (i = 0; i < nb_components; i++) {
1216  id = get_bits(&s->gb, 8) - 1;
1217  av_log(s->avctx, AV_LOG_DEBUG, "component: %d\n", id);
1218  /* find component index */
1219  for (index = 0; index < s->nb_components; index++)
1220  if (id == s->component_id[index])
1221  break;
1222  if (index == s->nb_components) {
1224  "decode_sos: index(%d) out of components\n", index);
1225  return AVERROR_INVALIDDATA;
1226  }
1227  /* Metasoft MJPEG codec has Cb and Cr swapped */
1228  if (s->avctx->codec_tag == MKTAG('M', 'T', 'S', 'J')
1229  && nb_components == 3 && s->nb_components == 3 && i)
1230  index = 3 - i;
1231 
1232  if(nb_components == 3 && s->nb_components == 3 && s->avctx->pix_fmt == AV_PIX_FMT_GBR24P)
1233  index = (i+2)%3;
1234  if(nb_components == 1 && s->nb_components == 3 && s->avctx->pix_fmt == AV_PIX_FMT_GBR24P)
1235  index = (index+2)%3;
1236 
1237  s->comp_index[i] = index;
1238 
1239  s->nb_blocks[i] = s->h_count[index] * s->v_count[index];
1240  s->h_scount[i] = s->h_count[index];
1241  s->v_scount[i] = s->v_count[index];
1242 
1243  s->dc_index[i] = get_bits(&s->gb, 4);
1244  s->ac_index[i] = get_bits(&s->gb, 4);
1245 
1246  if (s->dc_index[i] < 0 || s->ac_index[i] < 0 ||
1247  s->dc_index[i] >= 4 || s->ac_index[i] >= 4)
1248  goto out_of_range;
1249  if (!s->vlcs[0][s->dc_index[i]].table || !(s->progressive ? s->vlcs[2][s->ac_index[0]].table : s->vlcs[1][s->ac_index[i]].table))
1250  goto out_of_range;
1251  }
1252 
1253  predictor = get_bits(&s->gb, 8); /* JPEG Ss / lossless JPEG predictor /JPEG-LS NEAR */
1254  ilv = get_bits(&s->gb, 8); /* JPEG Se / JPEG-LS ILV */
1255  if(s->avctx->codec_tag != AV_RL32("CJPG")){
1256  prev_shift = get_bits(&s->gb, 4); /* Ah */
1257  point_transform = get_bits(&s->gb, 4); /* Al */
1258  }else
1259  prev_shift = point_transform = 0;
1260 
1261  if (nb_components > 1) {
1262  /* interleaved stream */
1263  s->mb_width = (s->width + s->h_max * block_size - 1) / (s->h_max * block_size);
1264  s->mb_height = (s->height + s->v_max * block_size - 1) / (s->v_max * block_size);
1265  } else if (!s->ls) { /* skip this for JPEG-LS */
1266  h = s->h_max / s->h_scount[0];
1267  v = s->v_max / s->v_scount[0];
1268  s->mb_width = (s->width + h * block_size - 1) / (h * block_size);
1269  s->mb_height = (s->height + v * block_size - 1) / (v * block_size);
1270  s->nb_blocks[0] = 1;
1271  s->h_scount[0] = 1;
1272  s->v_scount[0] = 1;
1273  }
1274 
1275  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1276  av_log(s->avctx, AV_LOG_DEBUG, "%s %s p:%d >>:%d ilv:%d bits:%d skip:%d %s comp:%d\n",
1277  s->lossless ? "lossless" : "sequential DCT", s->rgb ? "RGB" : "",
1278  predictor, point_transform, ilv, s->bits, s->mjpb_skiptosod,
1279  s->pegasus_rct ? "PRCT" : (s->rct ? "RCT" : ""), nb_components);
1280 
1281 
1282  /* mjpeg-b can have padding bytes between sos and image data, skip them */
1283  for (i = s->mjpb_skiptosod; i > 0; i--)
1284  skip_bits(&s->gb, 8);
1285 
1286 next_field:
1287  for (i = 0; i < nb_components; i++)
1288  s->last_dc[i] = 1024;
1289 
1290  if (s->lossless) {
1291  av_assert0(s->picture_ptr == &s->picture);
1292  if (CONFIG_JPEGLS_DECODER && s->ls) {
1293 // for () {
1294 // reset_ls_coding_parameters(s, 0);
1295 
1296  if ((ret = ff_jpegls_decode_picture(s, predictor,
1297  point_transform, ilv)) < 0)
1298  return ret;
1299  } else {
1300  if (s->rgb) {
1301  if ((ret = ljpeg_decode_rgb_scan(s, nb_components, predictor, point_transform)) < 0)
1302  return ret;
1303  } else {
1304  if ((ret = ljpeg_decode_yuv_scan(s, nb_components, predictor, point_transform)) < 0)
1305  return ret;
1306  }
1307  }
1308  } else {
1309  if (s->progressive && predictor) {
1310  av_assert0(s->picture_ptr == &s->picture);
1311  if ((ret = mjpeg_decode_scan_progressive_ac(s, predictor,
1312  ilv, prev_shift,
1313  point_transform)) < 0)
1314  return ret;
1315  } else {
1316  if ((ret = mjpeg_decode_scan(s, nb_components,
1317  prev_shift, point_transform,
1318  mb_bitmask, reference)) < 0)
1319  return ret;
1320  }
1321  }
1322 
1323  if (s->interlaced &&
1324  get_bits_left(&s->gb) > 32 &&
1325  show_bits(&s->gb, 8) == 0xFF) {
1326  GetBitContext bak = s->gb;
1327  align_get_bits(&bak);
1328  if (show_bits(&bak, 16) == 0xFFD1) {
1329  av_log(s->avctx, AV_LOG_DEBUG, "AVRn interlaced picture marker found\n");
1330  s->gb = bak;
1331  skip_bits(&s->gb, 16);
1332  s->bottom_field ^= 1;
1333 
1334  goto next_field;
1335  }
1336  }
1337 
1338  emms_c();
1339  return 0;
1340  out_of_range:
1341  av_log(s->avctx, AV_LOG_ERROR, "decode_sos: ac/dc index out of range\n");
1342  return AVERROR_INVALIDDATA;
1343 }
1344 
1346 {
1347  if (get_bits(&s->gb, 16) != 4)
1348  return AVERROR_INVALIDDATA;
1349  s->restart_interval = get_bits(&s->gb, 16);
1350  s->restart_count = 0;
1351  av_log(s->avctx, AV_LOG_DEBUG, "restart interval: %d\n",
1352  s->restart_interval);
1353 
1354  return 0;
1355 }
1356 
1358 {
1359  int len, id, i;
1360 
1361  len = get_bits(&s->gb, 16);
1362  if (len < 5)
1363  return AVERROR_INVALIDDATA;
1364  if (8 * len > get_bits_left(&s->gb))
1365  return AVERROR_INVALIDDATA;
1366 
1367  id = get_bits_long(&s->gb, 32);
1368  len -= 6;
1369 
1370  if (s->avctx->debug & FF_DEBUG_STARTCODE)
1371  av_log(s->avctx, AV_LOG_DEBUG, "APPx %8X\n", id);
1372 
1373  /* Buggy AVID, it puts EOI only at every 10th frame. */
1374  /* Also, this fourcc is used by non-avid files too, it holds some
1375  information, but it's always present in AVID-created files. */
1376  if (id == AV_RB32("AVI1")) {
1377  /* structure:
1378  4bytes AVI1
1379  1bytes polarity
1380  1bytes always zero
1381  4bytes field_size
1382  4bytes field_size_less_padding
1383  */
1384  s->buggy_avid = 1;
1385  i = get_bits(&s->gb, 8); len--;
1386  av_log(s->avctx, AV_LOG_DEBUG, "polarity %d\n", i);
1387 #if 0
1388  skip_bits(&s->gb, 8);
1389  skip_bits(&s->gb, 32);
1390  skip_bits(&s->gb, 32);
1391  len -= 10;
1392 #endif
1393  goto out;
1394  }
1395 
1396 // len -= 2;
1397 
1398  if (id == AV_RB32("JFIF")) {
1399  int t_w, t_h, v1, v2;
1400  skip_bits(&s->gb, 8); /* the trailing zero-byte */
1401  v1 = get_bits(&s->gb, 8);
1402  v2 = get_bits(&s->gb, 8);
1403  skip_bits(&s->gb, 8);
1404 
1405  s->avctx->sample_aspect_ratio.num = get_bits(&s->gb, 16);
1406  s->avctx->sample_aspect_ratio.den = get_bits(&s->gb, 16);
1407 
1408  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1409  av_log(s->avctx, AV_LOG_INFO,
1410  "mjpeg: JFIF header found (version: %x.%x) SAR=%d/%d\n",
1411  v1, v2,
1414 
1415  t_w = get_bits(&s->gb, 8);
1416  t_h = get_bits(&s->gb, 8);
1417  if (t_w && t_h) {
1418  /* skip thumbnail */
1419  if (len -10 - (t_w * t_h * 3) > 0)
1420  len -= t_w * t_h * 3;
1421  }
1422  len -= 10;
1423  goto out;
1424  }
1425 
1426  if (id == AV_RB32("Adob") && (get_bits(&s->gb, 8) == 'e')) {
1427  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1428  av_log(s->avctx, AV_LOG_INFO, "mjpeg: Adobe header found\n");
1429  skip_bits(&s->gb, 16); /* version */
1430  skip_bits(&s->gb, 16); /* flags0 */
1431  skip_bits(&s->gb, 16); /* flags1 */
1432  skip_bits(&s->gb, 8); /* transform */
1433  len -= 7;
1434  goto out;
1435  }
1436 
1437  if (id == AV_RB32("LJIF")) {
1438  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1439  av_log(s->avctx, AV_LOG_INFO,
1440  "Pegasus lossless jpeg header found\n");
1441  skip_bits(&s->gb, 16); /* version ? */
1442  skip_bits(&s->gb, 16); /* unknown always 0? */
1443  skip_bits(&s->gb, 16); /* unknown always 0? */
1444  skip_bits(&s->gb, 16); /* unknown always 0? */
1445  switch (get_bits(&s->gb, 8)) {
1446  case 1:
1447  s->rgb = 1;
1448  s->pegasus_rct = 0;
1449  break;
1450  case 2:
1451  s->rgb = 1;
1452  s->pegasus_rct = 1;
1453  break;
1454  default:
1455  av_log(s->avctx, AV_LOG_ERROR, "unknown colorspace\n");
1456  }
1457  len -= 9;
1458  goto out;
1459  }
1460 
1461  /* Apple MJPEG-A */
1462  if ((s->start_code == APP1) && (len > (0x28 - 8))) {
1463  id = get_bits_long(&s->gb, 32);
1464  len -= 4;
1465  /* Apple MJPEG-A */
1466  if (id == AV_RB32("mjpg")) {
1467 #if 0
1468  skip_bits(&s->gb, 32); /* field size */
1469  skip_bits(&s->gb, 32); /* pad field size */
1470  skip_bits(&s->gb, 32); /* next off */
1471  skip_bits(&s->gb, 32); /* quant off */
1472  skip_bits(&s->gb, 32); /* huff off */
1473  skip_bits(&s->gb, 32); /* image off */
1474  skip_bits(&s->gb, 32); /* scan off */
1475  skip_bits(&s->gb, 32); /* data off */
1476 #endif
1477  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1478  av_log(s->avctx, AV_LOG_INFO, "mjpeg: Apple MJPEG-A header found\n");
1479  }
1480  }
1481 
1482 out:
1483  /* slow but needed for extreme adobe jpegs */
1484  if (len < 0)
1486  "mjpeg: error, decode_app parser read over the end\n");
1487  while (--len > 0)
1488  skip_bits(&s->gb, 8);
1489 
1490  return 0;
1491 }
1492 
1494 {
1495  int len = get_bits(&s->gb, 16);
1496  if (len >= 2 && 8 * len - 16 <= get_bits_left(&s->gb)) {
1497  char *cbuf = av_malloc(len - 1);
1498  if (cbuf) {
1499  int i;
1500  for (i = 0; i < len - 2; i++)
1501  cbuf[i] = get_bits(&s->gb, 8);
1502  if (i > 0 && cbuf[i - 1] == '\n')
1503  cbuf[i - 1] = 0;
1504  else
1505  cbuf[i] = 0;
1506 
1507  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1508  av_log(s->avctx, AV_LOG_INFO, "comment: '%s'\n", cbuf);
1509 
1510  /* buggy avid, it puts EOI only at every 10th frame */
1511  if (!strcmp(cbuf, "AVID")) {
1512  s->buggy_avid = 1;
1513  } else if (!strcmp(cbuf, "CS=ITU601"))
1514  s->cs_itu601 = 1;
1515  else if ((len > 31 && !strncmp(cbuf, "Intel(R) JPEG Library, version 1", 32)) ||
1516  (len > 19 && !strncmp(cbuf, "Metasoft MJPEG Codec", 20)))
1517  s->flipped = 1;
1518 
1519  av_free(cbuf);
1520  }
1521  }
1522 
1523  return 0;
1524 }
1525 
1526 /* return the 8 bit start code value and update the search
1527  state. Return -1 if no start code found */
1528 static int find_marker(const uint8_t **pbuf_ptr, const uint8_t *buf_end)
1529 {
1530  const uint8_t *buf_ptr;
1531  unsigned int v, v2;
1532  int val;
1533  int skipped = 0;
1534 
1535  buf_ptr = *pbuf_ptr;
1536  while (buf_ptr < buf_end) {
1537  v = *buf_ptr++;
1538  v2 = *buf_ptr;
1539  if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe) && buf_ptr < buf_end) {
1540  val = *buf_ptr++;
1541  goto found;
1542  }
1543  skipped++;
1544  }
1545  val = -1;
1546 found:
1547  av_dlog(NULL, "find_marker skipped %d bytes\n", skipped);
1548  *pbuf_ptr = buf_ptr;
1549  return val;
1550 }
1551 
1553  const uint8_t **buf_ptr, const uint8_t *buf_end,
1554  const uint8_t **unescaped_buf_ptr,
1555  int *unescaped_buf_size)
1556 {
1557  int start_code;
1558  start_code = find_marker(buf_ptr, buf_end);
1559 
1560  av_fast_padded_malloc(&s->buffer, &s->buffer_size, buf_end - *buf_ptr);
1561  if (!s->buffer)
1562  return AVERROR(ENOMEM);
1563 
1564  /* unescape buffer of SOS, use special treatment for JPEG-LS */
1565  if (start_code == SOS && !s->ls) {
1566  const uint8_t *src = *buf_ptr;
1567  uint8_t *dst = s->buffer;
1568 
1569  while (src < buf_end) {
1570  uint8_t x = *(src++);
1571 
1572  *(dst++) = x;
1573  if (s->avctx->codec_id != AV_CODEC_ID_THP) {
1574  if (x == 0xff) {
1575  while (src < buf_end && x == 0xff)
1576  x = *(src++);
1577 
1578  if (x >= 0xd0 && x <= 0xd7)
1579  *(dst++) = x;
1580  else if (x)
1581  break;
1582  }
1583  }
1584  }
1585  *unescaped_buf_ptr = s->buffer;
1586  *unescaped_buf_size = dst - s->buffer;
1587  memset(s->buffer + *unescaped_buf_size, 0,
1589 
1590  av_log(s->avctx, AV_LOG_DEBUG, "escaping removed %td bytes\n",
1591  (buf_end - *buf_ptr) - (dst - s->buffer));
1592  } else if (start_code == SOS && s->ls) {
1593  const uint8_t *src = *buf_ptr;
1594  uint8_t *dst = s->buffer;
1595  int bit_count = 0;
1596  int t = 0, b = 0;
1597  PutBitContext pb;
1598 
1599  s->cur_scan++;
1600 
1601  /* find marker */
1602  while (src + t < buf_end) {
1603  uint8_t x = src[t++];
1604  if (x == 0xff) {
1605  while ((src + t < buf_end) && x == 0xff)
1606  x = src[t++];
1607  if (x & 0x80) {
1608  t -= FFMIN(2, t);
1609  break;
1610  }
1611  }
1612  }
1613  bit_count = t * 8;
1614  init_put_bits(&pb, dst, t);
1615 
1616  /* unescape bitstream */
1617  while (b < t) {
1618  uint8_t x = src[b++];
1619  put_bits(&pb, 8, x);
1620  if (x == 0xFF) {
1621  x = src[b++];
1622  put_bits(&pb, 7, x);
1623  bit_count--;
1624  }
1625  }
1626  flush_put_bits(&pb);
1627 
1628  *unescaped_buf_ptr = dst;
1629  *unescaped_buf_size = (bit_count + 7) >> 3;
1630  memset(s->buffer + *unescaped_buf_size, 0,
1632  } else {
1633  *unescaped_buf_ptr = *buf_ptr;
1634  *unescaped_buf_size = buf_end - *buf_ptr;
1635  }
1636 
1637  return start_code;
1638 }
1639 
1640 int ff_mjpeg_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
1641  AVPacket *avpkt)
1642 {
1643  const uint8_t *buf = avpkt->data;
1644  int buf_size = avpkt->size;
1645  MJpegDecodeContext *s = avctx->priv_data;
1646  const uint8_t *buf_end, *buf_ptr;
1647  const uint8_t *unescaped_buf_ptr;
1648  int hshift, vshift;
1649  int unescaped_buf_size;
1650  int start_code;
1651  int i, index;
1652  int ret = 0;
1653  AVFrame *picture = data;
1654 
1655  buf_ptr = buf;
1656  buf_end = buf + buf_size;
1657  while (buf_ptr < buf_end) {
1658  /* find start next marker */
1659  start_code = ff_mjpeg_find_marker(s, &buf_ptr, buf_end,
1660  &unescaped_buf_ptr,
1661  &unescaped_buf_size);
1662  /* EOF */
1663  if (start_code < 0) {
1664  goto the_end;
1665  } else if (unescaped_buf_size > (1U<<28)) {
1666  av_log(avctx, AV_LOG_ERROR, "MJPEG packet 0x%x too big (0x%x/0x%x), corrupt data?\n",
1667  start_code, unescaped_buf_size, buf_size);
1668  return AVERROR_INVALIDDATA;
1669  } else {
1670  av_log(avctx, AV_LOG_DEBUG, "marker=%x avail_size_in_buf=%td\n",
1671  start_code, buf_end - buf_ptr);
1672 
1673  init_get_bits(&s->gb, unescaped_buf_ptr, unescaped_buf_size * 8);
1674 
1675  s->start_code = start_code;
1676  if (s->avctx->debug & FF_DEBUG_STARTCODE)
1677  av_log(avctx, AV_LOG_DEBUG, "startcode: %X\n", start_code);
1678 
1679  /* process markers */
1680  if (start_code >= 0xd0 && start_code <= 0xd7)
1681  av_log(avctx, AV_LOG_DEBUG,
1682  "restart marker: %d\n", start_code & 0x0f);
1683  /* APP fields */
1684  else if (start_code >= APP0 && start_code <= APP15)
1685  mjpeg_decode_app(s);
1686  /* Comment */
1687  else if (start_code == COM)
1688  mjpeg_decode_com(s);
1689 
1690  ret = -1;
1691  switch (start_code) {
1692  case SOI:
1693  s->restart_interval = 0;
1694  s->restart_count = 0;
1695  /* nothing to do on SOI */
1696  break;
1697  case DQT:
1699  break;
1700  case DHT:
1701  if ((ret = ff_mjpeg_decode_dht(s)) < 0) {
1702  av_log(avctx, AV_LOG_ERROR, "huffman table decode error\n");
1703  goto fail;
1704  }
1705  break;
1706  case SOF0:
1707  case SOF1:
1708  s->lossless = 0;
1709  s->ls = 0;
1710  s->progressive = 0;
1711  if ((ret = ff_mjpeg_decode_sof(s)) < 0)
1712  goto fail;
1713  break;
1714  case SOF2:
1715  s->lossless = 0;
1716  s->ls = 0;
1717  s->progressive = 1;
1718  if ((ret = ff_mjpeg_decode_sof(s)) < 0)
1719  goto fail;
1720  break;
1721  case SOF3:
1722  s->lossless = 1;
1723  s->ls = 0;
1724  s->progressive = 0;
1725  if ((ret = ff_mjpeg_decode_sof(s)) < 0)
1726  goto fail;
1727  break;
1728  case SOF48:
1729  s->lossless = 1;
1730  s->ls = 1;
1731  s->progressive = 0;
1732  if ((ret = ff_mjpeg_decode_sof(s)) < 0)
1733  goto fail;
1734  break;
1735  case LSE:
1736  if (!CONFIG_JPEGLS_DECODER ||
1737  (ret = ff_jpegls_decode_lse(s)) < 0)
1738  goto fail;
1739  break;
1740  case EOI:
1741 eoi_parser:
1742  s->cur_scan = 0;
1743  if (!s->got_picture) {
1744  av_log(avctx, AV_LOG_WARNING,
1745  "Found EOI before any SOF, ignoring\n");
1746  break;
1747  }
1748  if (s->interlaced) {
1749  s->bottom_field ^= 1;
1750  /* if not bottom field, do not output image yet */
1751  if (s->bottom_field == !s->interlace_polarity)
1752  break;
1753  }
1754  *picture = *s->picture_ptr;
1755  *got_frame = 1;
1756  s->got_picture = 0;
1757 
1758  if (!s->lossless) {
1759  picture->quality = FFMAX3(s->qscale[0],
1760  s->qscale[1],
1761  s->qscale[2]);
1762  picture->qstride = 0;
1763  picture->qscale_table = s->qscale_table;
1764  memset(picture->qscale_table, picture->quality,
1765  (s->width + 15) / 16);
1766  if (avctx->debug & FF_DEBUG_QP)
1767  av_log(avctx, AV_LOG_DEBUG,
1768  "QP: %d\n", picture->quality);
1769  picture->quality *= FF_QP2LAMBDA;
1770  }
1771 
1772  goto the_end;
1773  case SOS:
1774  if ((ret = ff_mjpeg_decode_sos(s, NULL, NULL)) < 0 &&
1775  (avctx->err_recognition & AV_EF_EXPLODE))
1776  goto fail;
1777  break;
1778  case DRI:
1779  mjpeg_decode_dri(s);
1780  break;
1781  case SOF5:
1782  case SOF6:
1783  case SOF7:
1784  case SOF9:
1785  case SOF10:
1786  case SOF11:
1787  case SOF13:
1788  case SOF14:
1789  case SOF15:
1790  case JPG:
1791  av_log(avctx, AV_LOG_ERROR,
1792  "mjpeg: unsupported coding type (%x)\n", start_code);
1793  break;
1794  }
1795 
1796  /* eof process start code */
1797  buf_ptr += (get_bits_count(&s->gb) + 7) / 8;
1798  av_log(avctx, AV_LOG_DEBUG,
1799  "marker parser used %d bytes (%d bits)\n",
1800  (get_bits_count(&s->gb) + 7) / 8, get_bits_count(&s->gb));
1801  }
1802  }
1803  if (s->got_picture) {
1804  av_log(avctx, AV_LOG_WARNING, "EOI missing, emulating\n");
1805  goto eoi_parser;
1806  }
1807  av_log(avctx, AV_LOG_FATAL, "No JPEG data found in image\n");
1808  return AVERROR_INVALIDDATA;
1809 fail:
1810  s->got_picture = 0;
1811  return ret;
1812 the_end:
1813  if (s->upscale_h) {
1814  uint8_t *line = s->picture_ptr->data[s->upscale_h];
1816  avctx->pix_fmt == AV_PIX_FMT_YUV444P ||
1817  avctx->pix_fmt == AV_PIX_FMT_YUVJ440P ||
1818  avctx->pix_fmt == AV_PIX_FMT_YUV440P);
1819  for (i = 0; i < s->chroma_height; i++) {
1820  for (index = s->width - 1; index; index--)
1821  line[index] = (line[index / 2] + line[(index + 1) / 2]) >> 1;
1822  line += s->linesize[s->upscale_h];
1823  }
1824  }
1825  if (s->upscale_v) {
1826  uint8_t *dst = &((uint8_t *)s->picture_ptr->data[s->upscale_v])[(s->height - 1) * s->linesize[s->upscale_v]];
1827  int w;
1828  avcodec_get_chroma_sub_sample(s->avctx->pix_fmt, &hshift, &vshift);
1829  w = s->width >> hshift;
1831  avctx->pix_fmt == AV_PIX_FMT_YUV444P ||
1832  avctx->pix_fmt == AV_PIX_FMT_YUVJ422P ||
1833  avctx->pix_fmt == AV_PIX_FMT_YUV422P);
1834  for (i = s->height - 1; i; i--) {
1835  uint8_t *src1 = &((uint8_t *)s->picture_ptr->data[s->upscale_v])[i / 2 * s->linesize[s->upscale_v]];
1836  uint8_t *src2 = &((uint8_t *)s->picture_ptr->data[s->upscale_v])[(i + 1) / 2 * s->linesize[s->upscale_v]];
1837  if (src1 == src2) {
1838  memcpy(dst, src1, w);
1839  } else {
1840  for (index = 0; index < w; index++)
1841  dst[index] = (src1[index] + src2[index]) >> 1;
1842  }
1843  dst -= s->linesize[s->upscale_v];
1844  }
1845  }
1846  if (s->flipped && (s->avctx->flags & CODEC_FLAG_EMU_EDGE)) {
1847  int j;
1848  avcodec_get_chroma_sub_sample(s->avctx->pix_fmt, &hshift, &vshift);
1849  for (index=0; index<4; index++) {
1850  uint8_t *dst = s->picture_ptr->data[index];
1851  int w = s->width;
1852  int h = s->height;
1853  if(index && index<3){
1854  w = -((-w) >> hshift);
1855  h = -((-h) >> vshift);
1856  }
1857  if(dst){
1858  uint8_t *dst2 = dst + s->linesize[index]*(h-1);
1859  for (i=0; i<h/2; i++) {
1860  for (j=0; j<w; j++)
1861  FFSWAP(int, dst[j], dst2[j]);
1862  dst += s->linesize[index];
1863  dst2 -= s->linesize[index];
1864  }
1865  }
1866  }
1867  }
1868 
1869  av_log(avctx, AV_LOG_DEBUG, "decode frame unused %td bytes\n",
1870  buf_end - buf_ptr);
1871 // return buf_end - buf_ptr;
1872  return buf_ptr - buf;
1873 }
1874 
1876 {
1877  MJpegDecodeContext *s = avctx->priv_data;
1878  int i, j;
1879 
1880  if (s->picture_ptr && s->picture_ptr->data[0])
1881  avctx->release_buffer(avctx, s->picture_ptr);
1882 
1883  av_free(s->buffer);
1884  av_free(s->qscale_table);
1885  av_freep(&s->ljpeg_buffer);
1886  s->ljpeg_buffer_size = 0;
1887 
1888  for (i = 0; i < 3; i++) {
1889  for (j = 0; j < 4; j++)
1890  ff_free_vlc(&s->vlcs[i][j]);
1891  }
1892  for (i = 0; i < MAX_COMPONENTS; i++) {
1893  av_freep(&s->blocks[i]);
1894  av_freep(&s->last_nnz[i]);
1895  }
1896  return 0;
1897 }
1898 
1899 static void decode_flush(AVCodecContext *avctx)
1900 {
1901  MJpegDecodeContext *s = avctx->priv_data;
1902  s->got_picture = 0;
1903 }
1904 
1905 #if CONFIG_MJPEG_DECODER
1906 #define OFFSET(x) offsetof(MJpegDecodeContext, x)
1907 #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
1908 static const AVOption options[] = {
1909  { "extern_huff", "Use external huffman table.",
1910  OFFSET(extern_huff), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VD },
1911  { NULL },
1912 };
1913 
1914 static const AVClass mjpegdec_class = {
1915  .class_name = "MJPEG decoder",
1916  .item_name = av_default_item_name,
1917  .option = options,
1918  .version = LIBAVUTIL_VERSION_INT,
1919 };
1920 
1921 AVCodec ff_mjpeg_decoder = {
1922  .name = "mjpeg",
1923  .type = AVMEDIA_TYPE_VIDEO,
1924  .id = AV_CODEC_ID_MJPEG,
1925  .priv_data_size = sizeof(MJpegDecodeContext),
1929  .flush = decode_flush,
1930  .capabilities = CODEC_CAP_DR1,
1931  .max_lowres = 3,
1932  .long_name = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),
1933  .priv_class = &mjpegdec_class,
1934 };
1935 #endif
1936 #if CONFIG_THP_DECODER
1937 AVCodec ff_thp_decoder = {
1938  .name = "thp",
1939  .type = AVMEDIA_TYPE_VIDEO,
1940  .id = AV_CODEC_ID_THP,
1941  .priv_data_size = sizeof(MJpegDecodeContext),
1945  .flush = decode_flush,
1946  .capabilities = CODEC_CAP_DR1,
1947  .max_lowres = 3,
1948  .long_name = NULL_IF_CONFIG_SMALL("Nintendo Gamecube THP video"),
1949 };
1950 #endif