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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 
28 /**
29  * @file
30  * MJPEG decoder.
31  */
32 
33 #include "libavutil/imgutils.h"
34 #include "libavutil/avassert.h"
35 #include "libavutil/opt.h"
36 #include "avcodec.h"
37 #include "blockdsp.h"
38 #include "copy_block.h"
39 #include "idctdsp.h"
40 #include "internal.h"
41 #include "mjpeg.h"
42 #include "mjpegdec.h"
43 #include "jpeglsdec.h"
44 #include "tiff.h"
45 #include "exif.h"
46 #include "bytestream.h"
47 
48 
49 static int build_vlc(VLC *vlc, const uint8_t *bits_table,
50  const uint8_t *val_table, int nb_codes,
51  int use_static, int is_ac)
52 {
53  uint8_t huff_size[256] = { 0 };
54  uint16_t huff_code[256];
55  uint16_t huff_sym[256];
56  int i;
57 
58  av_assert0(nb_codes <= 256);
59 
60  ff_mjpeg_build_huffman_codes(huff_size, huff_code, bits_table, val_table);
61 
62  for (i = 0; i < 256; i++)
63  huff_sym[i] = i + 16 * is_ac;
64 
65  if (is_ac)
66  huff_sym[0] = 16 * 256;
67 
68  return ff_init_vlc_sparse(vlc, 9, nb_codes, huff_size, 1, 1,
69  huff_code, 2, 2, huff_sym, 2, 2, use_static);
70 }
71 
72 static void build_basic_mjpeg_vlc(MJpegDecodeContext *s)
73 {
74  build_vlc(&s->vlcs[0][0], avpriv_mjpeg_bits_dc_luminance,
75  avpriv_mjpeg_val_dc, 12, 0, 0);
76  build_vlc(&s->vlcs[0][1], avpriv_mjpeg_bits_dc_chrominance,
77  avpriv_mjpeg_val_dc, 12, 0, 0);
78  build_vlc(&s->vlcs[1][0], avpriv_mjpeg_bits_ac_luminance,
79  avpriv_mjpeg_val_ac_luminance, 251, 0, 1);
80  build_vlc(&s->vlcs[1][1], avpriv_mjpeg_bits_ac_chrominance,
81  avpriv_mjpeg_val_ac_chrominance, 251, 0, 1);
82  build_vlc(&s->vlcs[2][0], avpriv_mjpeg_bits_ac_luminance,
83  avpriv_mjpeg_val_ac_luminance, 251, 0, 0);
84  build_vlc(&s->vlcs[2][1], avpriv_mjpeg_bits_ac_chrominance,
85  avpriv_mjpeg_val_ac_chrominance, 251, 0, 0);
86 }
87 
88 static void parse_avid(MJpegDecodeContext *s, uint8_t *buf, int len)
89 {
90  s->buggy_avid = 1;
91  if (len > 14 && buf[12] == 1) /* 1 - NTSC */
92  s->interlace_polarity = 1;
93  if (len > 14 && buf[12] == 2) /* 2 - PAL */
94  s->interlace_polarity = 0;
95  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
96  av_log(s->avctx, AV_LOG_INFO, "AVID: len:%d %d\n", len, len > 14 ? buf[12] : -1);
97 }
98 
99 av_cold int ff_mjpeg_decode_init(AVCodecContext *avctx)
100 {
101  MJpegDecodeContext *s = avctx->priv_data;
102 
103  if (!s->picture_ptr) {
104  s->picture = av_frame_alloc();
105  if (!s->picture)
106  return AVERROR(ENOMEM);
107  s->picture_ptr = s->picture;
108  }
109 
110  s->avctx = avctx;
111  ff_blockdsp_init(&s->bdsp, avctx);
112  ff_hpeldsp_init(&s->hdsp, avctx->flags);
113  ff_idctdsp_init(&s->idsp, avctx);
114  ff_init_scantable(s->idsp.idct_permutation, &s->scantable,
115  ff_zigzag_direct);
116  s->buffer_size = 0;
117  s->buffer = NULL;
118  s->start_code = -1;
119  s->first_picture = 1;
120  s->got_picture = 0;
121  s->org_height = avctx->coded_height;
122  avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
123  avctx->colorspace = AVCOL_SPC_BT470BG;
124 
125  build_basic_mjpeg_vlc(s);
126 
127  if (s->extern_huff) {
128  av_log(avctx, AV_LOG_INFO, "using external huffman table\n");
129  init_get_bits(&s->gb, avctx->extradata, avctx->extradata_size * 8);
130  if (ff_mjpeg_decode_dht(s)) {
131  av_log(avctx, AV_LOG_ERROR,
132  "error using external huffman table, switching back to internal\n");
133  build_basic_mjpeg_vlc(s);
134  }
135  }
136  if (avctx->field_order == AV_FIELD_BB) { /* quicktime icefloe 019 */
137  s->interlace_polarity = 1; /* bottom field first */
138  av_log(avctx, AV_LOG_DEBUG, "bottom field first\n");
139  } else if (avctx->field_order == AV_FIELD_UNKNOWN) {
140  if (avctx->codec_tag == AV_RL32("MJPG"))
141  s->interlace_polarity = 1;
142  }
143 
144  if ( avctx->extradata_size > 8
145  && AV_RL32(avctx->extradata) == 0x2C
146  && AV_RL32(avctx->extradata+4) == 0x18) {
147  parse_avid(s, avctx->extradata, avctx->extradata_size);
148  }
149 
150  if (avctx->codec->id == AV_CODEC_ID_AMV)
151  s->flipped = 1;
152 
153  return 0;
154 }
155 
156 
157 /* quantize tables */
158 int ff_mjpeg_decode_dqt(MJpegDecodeContext *s)
159 {
160  int len, index, i, j;
161 
162  len = get_bits(&s->gb, 16) - 2;
163 
164  while (len >= 65) {
165  int pr = get_bits(&s->gb, 4);
166  if (pr > 1) {
167  av_log(s->avctx, AV_LOG_ERROR, "dqt: invalid precision\n");
168  return AVERROR_INVALIDDATA;
169  }
170  index = get_bits(&s->gb, 4);
171  if (index >= 4)
172  return -1;
173  av_log(s->avctx, AV_LOG_DEBUG, "index=%d\n", index);
174  /* read quant table */
175  for (i = 0; i < 64; i++) {
176  j = s->scantable.permutated[i];
177  s->quant_matrixes[index][j] = get_bits(&s->gb, pr ? 16 : 8);
178  }
179 
180  // XXX FIXME finetune, and perhaps add dc too
181  s->qscale[index] = FFMAX(s->quant_matrixes[index][s->scantable.permutated[1]],
182  s->quant_matrixes[index][s->scantable.permutated[8]]) >> 1;
183  av_log(s->avctx, AV_LOG_DEBUG, "qscale[%d]: %d\n",
184  index, s->qscale[index]);
185  len -= 65;
186  }
187  return 0;
188 }
189 
190 /* decode huffman tables and build VLC decoders */
191 int ff_mjpeg_decode_dht(MJpegDecodeContext *s)
192 {
193  int len, index, i, class, n, v, code_max;
194  uint8_t bits_table[17];
195  uint8_t val_table[256];
196  int ret = 0;
197 
198  len = get_bits(&s->gb, 16) - 2;
199 
200  while (len > 0) {
201  if (len < 17)
202  return AVERROR_INVALIDDATA;
203  class = get_bits(&s->gb, 4);
204  if (class >= 2)
205  return AVERROR_INVALIDDATA;
206  index = get_bits(&s->gb, 4);
207  if (index >= 4)
208  return AVERROR_INVALIDDATA;
209  n = 0;
210  for (i = 1; i <= 16; i++) {
211  bits_table[i] = get_bits(&s->gb, 8);
212  n += bits_table[i];
213  }
214  len -= 17;
215  if (len < n || n > 256)
216  return AVERROR_INVALIDDATA;
217 
218  code_max = 0;
219  for (i = 0; i < n; i++) {
220  v = get_bits(&s->gb, 8);
221  if (v > code_max)
222  code_max = v;
223  val_table[i] = v;
224  }
225  len -= n;
226 
227  /* build VLC and flush previous vlc if present */
228  ff_free_vlc(&s->vlcs[class][index]);
229  av_log(s->avctx, AV_LOG_DEBUG, "class=%d index=%d nb_codes=%d\n",
230  class, index, code_max + 1);
231  if ((ret = build_vlc(&s->vlcs[class][index], bits_table, val_table,
232  code_max + 1, 0, class > 0)) < 0)
233  return ret;
234 
235  if (class > 0) {
236  ff_free_vlc(&s->vlcs[2][index]);
237  if ((ret = build_vlc(&s->vlcs[2][index], bits_table, val_table,
238  code_max + 1, 0, 0)) < 0)
239  return ret;
240  }
241  }
242  return 0;
243 }
244 
245 int ff_mjpeg_decode_sof(MJpegDecodeContext *s)
246 {
247  int len, nb_components, i, width, height, bits, ret;
248  unsigned pix_fmt_id;
249  int h_count[MAX_COMPONENTS];
250  int v_count[MAX_COMPONENTS];
251 
252  s->cur_scan = 0;
253  s->upscale_h = s->upscale_v = 0;
254 
255  /* XXX: verify len field validity */
256  len = get_bits(&s->gb, 16);
257  s->avctx->bits_per_raw_sample =
258  bits = get_bits(&s->gb, 8);
259 
260  if (bits > 16 || bits < 1) {
261  av_log(s->avctx, AV_LOG_ERROR, "bits %d is invalid\n", bits);
262  return AVERROR_INVALIDDATA;
263  }
264 
265  if (s->pegasus_rct)
266  bits = 9;
267  if (bits == 9 && !s->pegasus_rct)
268  s->rct = 1; // FIXME ugly
269 
270  if(s->lossless && s->avctx->lowres){
271  av_log(s->avctx, AV_LOG_ERROR, "lowres is not possible with lossless jpeg\n");
272  return -1;
273  }
274 
275  height = get_bits(&s->gb, 16);
276  width = get_bits(&s->gb, 16);
277 
278  if (s->avctx->codec_id == AV_CODEC_ID_AMV && (height&15))
279  avpriv_request_sample(s->avctx, "non mod 16 height AMV\n");
280 
281  // HACK for odd_height.mov
282  if (s->interlaced && s->width == width && s->height == height + 1)
283  height= s->height;
284 
285  av_log(s->avctx, AV_LOG_DEBUG, "sof0: picture: %dx%d\n", width, height);
286  if (av_image_check_size(width, height, 0, s->avctx))
287  return AVERROR_INVALIDDATA;
288 
289  nb_components = get_bits(&s->gb, 8);
290  if (nb_components <= 0 ||
291  nb_components > MAX_COMPONENTS)
292  return -1;
293  if (s->interlaced && (s->bottom_field == !s->interlace_polarity)) {
294  if (nb_components != s->nb_components) {
295  av_log(s->avctx, AV_LOG_ERROR,
296  "nb_components changing in interlaced picture\n");
297  return AVERROR_INVALIDDATA;
298  }
299  }
300  if (s->ls && !(bits <= 8 || nb_components == 1)) {
301  avpriv_report_missing_feature(s->avctx,
302  "JPEG-LS that is not <= 8 "
303  "bits/component or 16-bit gray");
304  return AVERROR_PATCHWELCOME;
305  }
306  s->nb_components = nb_components;
307  s->h_max = 1;
308  s->v_max = 1;
309  memset(h_count, 0, sizeof(h_count));
310  memset(v_count, 0, sizeof(v_count));
311  for (i = 0; i < nb_components; i++) {
312  /* component id */
313  s->component_id[i] = get_bits(&s->gb, 8) - 1;
314  h_count[i] = get_bits(&s->gb, 4);
315  v_count[i] = get_bits(&s->gb, 4);
316  /* compute hmax and vmax (only used in interleaved case) */
317  if (h_count[i] > s->h_max)
318  s->h_max = h_count[i];
319  if (v_count[i] > s->v_max)
320  s->v_max = v_count[i];
321  s->quant_index[i] = get_bits(&s->gb, 8);
322  if (s->quant_index[i] >= 4) {
323  av_log(s->avctx, AV_LOG_ERROR, "quant_index is invalid\n");
324  return AVERROR_INVALIDDATA;
325  }
326  if (!h_count[i] || !v_count[i]) {
327  av_log(s->avctx, AV_LOG_ERROR,
328  "Invalid sampling factor in component %d %d:%d\n",
329  i, h_count[i], v_count[i]);
330  return AVERROR_INVALIDDATA;
331  }
332 
333  av_log(s->avctx, AV_LOG_DEBUG, "component %d %d:%d id: %d quant:%d\n",
334  i, h_count[i], v_count[i],
335  s->component_id[i], s->quant_index[i]);
336  }
337 
338  if (s->ls && (s->h_max > 1 || s->v_max > 1)) {
339  avpriv_report_missing_feature(s->avctx, "Subsampling in JPEG-LS");
340  return AVERROR_PATCHWELCOME;
341  }
342 
343 
344  /* if different size, realloc/alloc picture */
345  if ( width != s->width || height != s->height
346  || bits != s->bits
347  || memcmp(s->h_count, h_count, sizeof(h_count))
348  || memcmp(s->v_count, v_count, sizeof(v_count))) {
349 
350  s->width = width;
351  s->height = height;
352  s->bits = bits;
353  memcpy(s->h_count, h_count, sizeof(h_count));
354  memcpy(s->v_count, v_count, sizeof(v_count));
355  s->interlaced = 0;
356  s->got_picture = 0;
357 
358  /* test interlaced mode */
359  if (s->first_picture &&
360  s->org_height != 0 &&
361  s->height < ((s->org_height * 3) / 4)) {
362  s->interlaced = 1;
363  s->bottom_field = s->interlace_polarity;
364  s->picture_ptr->interlaced_frame = 1;
365  s->picture_ptr->top_field_first = !s->interlace_polarity;
366  height *= 2;
367  }
368 
369  ret = ff_set_dimensions(s->avctx, width, height);
370  if (ret < 0)
371  return ret;
372 
373  s->first_picture = 0;
374  }
375 
376  if (s->got_picture && s->interlaced && (s->bottom_field == !s->interlace_polarity)) {
377  if (s->progressive) {
378  avpriv_request_sample(s->avctx, "progressively coded interlaced picture");
379  return AVERROR_INVALIDDATA;
380  }
381  } else{
382  if (s->v_max == 1 && s->h_max == 1 && s->lossless==1 && (nb_components==3 || nb_components==4))
383  s->rgb = 1;
384  else if (!s->lossless)
385  s->rgb = 0;
386  /* XXX: not complete test ! */
387  pix_fmt_id = ((unsigned)s->h_count[0] << 28) | (s->v_count[0] << 24) |
388  (s->h_count[1] << 20) | (s->v_count[1] << 16) |
389  (s->h_count[2] << 12) | (s->v_count[2] << 8) |
390  (s->h_count[3] << 4) | s->v_count[3];
391  av_log(s->avctx, AV_LOG_DEBUG, "pix fmt id %x\n", pix_fmt_id);
392  /* NOTE we do not allocate pictures large enough for the possible
393  * padding of h/v_count being 4 */
394  if (!(pix_fmt_id & 0xD0D0D0D0))
395  pix_fmt_id -= (pix_fmt_id & 0xF0F0F0F0) >> 1;
396  if (!(pix_fmt_id & 0x0D0D0D0D))
397  pix_fmt_id -= (pix_fmt_id & 0x0F0F0F0F) >> 1;
398 
399  for (i = 0; i < 8; i++) {
400  int j = 6 + (i&1) - (i&6);
401  int is = (pix_fmt_id >> (4*i)) & 0xF;
402  int js = (pix_fmt_id >> (4*j)) & 0xF;
403 
404  if (is == 1 && js != 2 && (i < 2 || i > 5))
405  js = (pix_fmt_id >> ( 8 + 4*(i&1))) & 0xF;
406  if (is == 1 && js != 2 && (i < 2 || i > 5))
407  js = (pix_fmt_id >> (16 + 4*(i&1))) & 0xF;
408 
409  if (is == 1 && js == 2) {
410  if (i & 1) s->upscale_h |= 1 << (j/2);
411  else s->upscale_v |= 1 << (j/2);
412  }
413  }
414 
415  switch (pix_fmt_id) {
416  case 0x11111100:
417  if (s->rgb)
418  s->avctx->pix_fmt = s->bits <= 9 ? AV_PIX_FMT_BGR24 : AV_PIX_FMT_BGR48;
419  else {
420  if (s->component_id[0] == 'Q' && s->component_id[1] == 'F' && s->component_id[2] == 'A') {
421  s->avctx->pix_fmt = s->bits <= 8 ? AV_PIX_FMT_GBRP : AV_PIX_FMT_GBRP16;
422  } else {
423  if (s->bits <= 8) s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV444P : AV_PIX_FMT_YUVJ444P;
424  else s->avctx->pix_fmt = AV_PIX_FMT_YUV444P16;
425  s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
426  }
427  }
428  av_assert0(s->nb_components == 3);
429  break;
430  case 0x11111111:
431  if (s->rgb)
432  s->avctx->pix_fmt = s->bits <= 9 ? AV_PIX_FMT_ABGR : AV_PIX_FMT_RGBA64;
433  else {
434  if (s->adobe_transform == 0 && s->bits <= 8) {
435  s->avctx->pix_fmt = AV_PIX_FMT_GBRAP;
436  } else {
437  s->avctx->pix_fmt = s->bits <= 8 ? AV_PIX_FMT_YUVA444P : AV_PIX_FMT_YUVA444P16;
438  s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
439  }
440  }
441  av_assert0(s->nb_components == 4);
442  break;
443  case 0x22111122:
444  case 0x22111111:
445  if (s->adobe_transform == 0 && s->bits <= 8) {
446  s->avctx->pix_fmt = AV_PIX_FMT_GBRAP;
447  s->upscale_v |= 6;
448  s->upscale_h |= 6;
449  } else if (s->adobe_transform == 2 && s->bits <= 8) {
450  s->avctx->pix_fmt = AV_PIX_FMT_YUVA444P;
451  s->upscale_v |= 6;
452  s->upscale_h |= 6;
453  s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
454  } else {
455  if (s->bits <= 8) s->avctx->pix_fmt = AV_PIX_FMT_YUVA420P;
456  else s->avctx->pix_fmt = AV_PIX_FMT_YUVA420P16;
457  s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
458  }
459  av_assert0(s->nb_components == 4);
460  break;
461  case 0x12121100:
462  case 0x22122100:
463  case 0x21211100:
464  case 0x22211200:
465  if (s->bits <= 8) s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV444P : AV_PIX_FMT_YUVJ444P;
466  else
467  goto unk_pixfmt;
468  s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
469  break;
470  case 0x22221100:
471  case 0x22112200:
472  case 0x11222200:
473  if (s->bits <= 8) s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV444P : AV_PIX_FMT_YUVJ444P;
474  else
475  goto unk_pixfmt;
476  s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
477  break;
478  case 0x11000000:
479  case 0x13000000:
480  case 0x14000000:
481  case 0x31000000:
482  case 0x33000000:
483  case 0x34000000:
484  case 0x41000000:
485  case 0x43000000:
486  case 0x44000000:
487  if(s->bits <= 8)
488  s->avctx->pix_fmt = AV_PIX_FMT_GRAY8;
489  else
490  s->avctx->pix_fmt = AV_PIX_FMT_GRAY16;
491  break;
492  case 0x12111100:
493  case 0x14121200:
494  case 0x14111100:
495  case 0x22211100:
496  case 0x22112100:
497  if (s->component_id[0] == 'Q' && s->component_id[1] == 'F' && s->component_id[2] == 'A') {
498  if (s->bits <= 8) s->avctx->pix_fmt = AV_PIX_FMT_GBRP;
499  else
500  goto unk_pixfmt;
501  s->upscale_v |= 3;
502  } else {
503  if (pix_fmt_id == 0x14111100)
504  s->upscale_v |= 6;
505  if (s->bits <= 8) s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV440P : AV_PIX_FMT_YUVJ440P;
506  else
507  goto unk_pixfmt;
508  s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
509  }
510  break;
511  case 0x21111100:
512  if (s->component_id[0] == 'Q' && s->component_id[1] == 'F' && s->component_id[2] == 'A') {
513  if (s->bits <= 8) s->avctx->pix_fmt = AV_PIX_FMT_GBRP;
514  else
515  goto unk_pixfmt;
516  s->upscale_h |= 3;
517  } else {
518  if (s->bits <= 8) s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV422P : AV_PIX_FMT_YUVJ422P;
519  else s->avctx->pix_fmt = AV_PIX_FMT_YUV422P16;
520  s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
521  }
522  break;
523  case 0x22121100:
524  case 0x22111200:
525  if (s->bits <= 8) s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV422P : AV_PIX_FMT_YUVJ422P;
526  else
527  goto unk_pixfmt;
528  s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
529  break;
530  case 0x22111100:
531  case 0x42111100:
532  case 0x24111100:
533  if (s->bits <= 8) s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV420P : AV_PIX_FMT_YUVJ420P;
534  else s->avctx->pix_fmt = AV_PIX_FMT_YUV420P16;
535  s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
536  if (pix_fmt_id == 0x42111100) {
537  if (s->bits > 8)
538  goto unk_pixfmt;
539  s->upscale_h = 6;
540  } else if (pix_fmt_id == 0x24111100) {
541  if (s->bits > 8)
542  goto unk_pixfmt;
543  s->upscale_v = 6;
544  }
545  break;
546  case 0x41111100:
547  if (s->bits <= 8) s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV411P : AV_PIX_FMT_YUVJ411P;
548  else
549  goto unk_pixfmt;
550  s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
551  break;
552  default:
553 unk_pixfmt:
554  av_log(s->avctx, AV_LOG_ERROR, "Unhandled pixel format 0x%x bits:%d\n", pix_fmt_id, s->bits);
555  s->upscale_h = s->upscale_v = 0;
556  return AVERROR_PATCHWELCOME;
557  }
558  if ((s->upscale_h || s->upscale_v) && s->avctx->lowres) {
559  av_log(s->avctx, AV_LOG_ERROR, "lowres not supported for weird subsampling\n");
560  return AVERROR_PATCHWELCOME;
561  }
562  if (s->ls) {
563  s->upscale_h = s->upscale_v = 0;
564  if (s->nb_components > 1)
565  s->avctx->pix_fmt = AV_PIX_FMT_RGB24;
566  else if (s->palette_index && s->bits <= 8)
567  s->avctx->pix_fmt = AV_PIX_FMT_PAL8;
568  else if (s->bits <= 8)
569  s->avctx->pix_fmt = AV_PIX_FMT_GRAY8;
570  else
571  s->avctx->pix_fmt = AV_PIX_FMT_GRAY16;
572  }
573 
574  s->pix_desc = av_pix_fmt_desc_get(s->avctx->pix_fmt);
575  if (!s->pix_desc) {
576  av_log(s->avctx, AV_LOG_ERROR, "Could not get a pixel format descriptor.\n");
577  return AVERROR_BUG;
578  }
579 
580  av_frame_unref(s->picture_ptr);
581  if (ff_get_buffer(s->avctx, s->picture_ptr, AV_GET_BUFFER_FLAG_REF) < 0)
582  return -1;
583  s->picture_ptr->pict_type = AV_PICTURE_TYPE_I;
584  s->picture_ptr->key_frame = 1;
585  s->got_picture = 1;
586 
587  for (i = 0; i < 4; i++)
588  s->linesize[i] = s->picture_ptr->linesize[i] << s->interlaced;
589 
590  av_dlog(s->avctx, "%d %d %d %d %d %d\n",
591  s->width, s->height, s->linesize[0], s->linesize[1],
592  s->interlaced, s->avctx->height);
593 
594  if (len != (8 + (3 * nb_components)))
595  av_log(s->avctx, AV_LOG_DEBUG, "decode_sof0: error, len(%d) mismatch\n", len);
596  }
597 
598  if (s->rgb && !s->lossless && !s->ls) {
599  av_log(s->avctx, AV_LOG_ERROR, "Unsupported coding and pixel format combination\n");
600  return AVERROR_PATCHWELCOME;
601  }
602 
603  /* totally blank picture as progressive JPEG will only add details to it */
604  if (s->progressive) {
605  int bw = (width + s->h_max * 8 - 1) / (s->h_max * 8);
606  int bh = (height + s->v_max * 8 - 1) / (s->v_max * 8);
607  for (i = 0; i < s->nb_components; i++) {
608  int size = bw * bh * s->h_count[i] * s->v_count[i];
609  av_freep(&s->blocks[i]);
610  av_freep(&s->last_nnz[i]);
611  s->blocks[i] = av_mallocz_array(size, sizeof(**s->blocks));
612  s->last_nnz[i] = av_mallocz_array(size, sizeof(**s->last_nnz));
613  if (!s->blocks[i] || !s->last_nnz[i])
614  return AVERROR(ENOMEM);
615  s->block_stride[i] = bw * s->h_count[i];
616  }
617  memset(s->coefs_finished, 0, sizeof(s->coefs_finished));
618  }
619  return 0;
620 }
621 
622 static inline int mjpeg_decode_dc(MJpegDecodeContext *s, int dc_index)
623 {
624  int code;
625  code = get_vlc2(&s->gb, s->vlcs[0][dc_index].table, 9, 2);
626  if (code < 0 || code > 16) {
627  av_log(s->avctx, AV_LOG_WARNING,
628  "mjpeg_decode_dc: bad vlc: %d:%d (%p)\n",
629  0, dc_index, &s->vlcs[0][dc_index]);
630  return 0xfffff;
631  }
632 
633  if (code)
634  return get_xbits(&s->gb, code);
635  else
636  return 0;
637 }
638 
639 /* decode block and dequantize */
640 static int decode_block(MJpegDecodeContext *s, int16_t *block, int component,
641  int dc_index, int ac_index, int16_t *quant_matrix)
642 {
643  int code, i, j, level, val;
644 
645  /* DC coef */
646  val = mjpeg_decode_dc(s, dc_index);
647  if (val == 0xfffff) {
648  av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
649  return AVERROR_INVALIDDATA;
650  }
651  val = val * quant_matrix[0] + s->last_dc[component];
652  s->last_dc[component] = val;
653  block[0] = val;
654  /* AC coefs */
655  i = 0;
656  {OPEN_READER(re, &s->gb);
657  do {
658  UPDATE_CACHE(re, &s->gb);
659  GET_VLC(code, re, &s->gb, s->vlcs[1][ac_index].table, 9, 2);
660 
661  i += ((unsigned)code) >> 4;
662  code &= 0xf;
663  if (code) {
664  if (code > MIN_CACHE_BITS - 16)
665  UPDATE_CACHE(re, &s->gb);
666 
667  {
668  int cache = GET_CACHE(re, &s->gb);
669  int sign = (~cache) >> 31;
670  level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
671  }
672 
673  LAST_SKIP_BITS(re, &s->gb, code);
674 
675  if (i > 63) {
676  av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
677  return AVERROR_INVALIDDATA;
678  }
679  j = s->scantable.permutated[i];
680  block[j] = level * quant_matrix[j];
681  }
682  } while (i < 63);
683  CLOSE_READER(re, &s->gb);}
684 
685  return 0;
686 }
687 
688 static int decode_dc_progressive(MJpegDecodeContext *s, int16_t *block,
689  int component, int dc_index,
690  int16_t *quant_matrix, int Al)
691 {
692  int val;
693  s->bdsp.clear_block(block);
694  val = mjpeg_decode_dc(s, dc_index);
695  if (val == 0xfffff) {
696  av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
697  return AVERROR_INVALIDDATA;
698  }
699  val = (val * quant_matrix[0] << Al) + s->last_dc[component];
700  s->last_dc[component] = val;
701  block[0] = val;
702  return 0;
703 }
704 
705 /* decode block and dequantize - progressive JPEG version */
706 static int decode_block_progressive(MJpegDecodeContext *s, int16_t *block,
707  uint8_t *last_nnz, int ac_index,
708  int16_t *quant_matrix,
709  int ss, int se, int Al, int *EOBRUN)
710 {
711  int code, i, j, level, val, run;
712 
713  if (*EOBRUN) {
714  (*EOBRUN)--;
715  return 0;
716  }
717 
718  {
719  OPEN_READER(re, &s->gb);
720  for (i = ss; ; i++) {
721  UPDATE_CACHE(re, &s->gb);
722  GET_VLC(code, re, &s->gb, s->vlcs[2][ac_index].table, 9, 2);
723 
724  run = ((unsigned) code) >> 4;
725  code &= 0xF;
726  if (code) {
727  i += run;
728  if (code > MIN_CACHE_BITS - 16)
729  UPDATE_CACHE(re, &s->gb);
730 
731  {
732  int cache = GET_CACHE(re, &s->gb);
733  int sign = (~cache) >> 31;
734  level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
735  }
736 
737  LAST_SKIP_BITS(re, &s->gb, code);
738 
739  if (i >= se) {
740  if (i == se) {
741  j = s->scantable.permutated[se];
742  block[j] = level * quant_matrix[j] << Al;
743  break;
744  }
745  av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
746  return AVERROR_INVALIDDATA;
747  }
748  j = s->scantable.permutated[i];
749  block[j] = level * quant_matrix[j] << Al;
750  } else {
751  if (run == 0xF) {// ZRL - skip 15 coefficients
752  i += 15;
753  if (i >= se) {
754  av_log(s->avctx, AV_LOG_ERROR, "ZRL overflow: %d\n", i);
755  return AVERROR_INVALIDDATA;
756  }
757  } else {
758  val = (1 << run);
759  if (run) {
760  UPDATE_CACHE(re, &s->gb);
761  val += NEG_USR32(GET_CACHE(re, &s->gb), run);
762  LAST_SKIP_BITS(re, &s->gb, run);
763  }
764  *EOBRUN = val - 1;
765  break;
766  }
767  }
768  }
769  CLOSE_READER(re, &s->gb);
770  }
771 
772  if (i > *last_nnz)
773  *last_nnz = i;
774 
775  return 0;
776 }
777 
778 #define REFINE_BIT(j) { \
779  UPDATE_CACHE(re, &s->gb); \
780  sign = block[j] >> 15; \
781  block[j] += SHOW_UBITS(re, &s->gb, 1) * \
782  ((quant_matrix[j] ^ sign) - sign) << Al; \
783  LAST_SKIP_BITS(re, &s->gb, 1); \
784 }
785 
786 #define ZERO_RUN \
787 for (; ; i++) { \
788  if (i > last) { \
789  i += run; \
790  if (i > se) { \
791  av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i); \
792  return -1; \
793  } \
794  break; \
795  } \
796  j = s->scantable.permutated[i]; \
797  if (block[j]) \
798  REFINE_BIT(j) \
799  else if (run-- == 0) \
800  break; \
801 }
802 
803 /* decode block and dequantize - progressive JPEG refinement pass */
804 static int decode_block_refinement(MJpegDecodeContext *s, int16_t *block,
805  uint8_t *last_nnz,
806  int ac_index, int16_t *quant_matrix,
807  int ss, int se, int Al, int *EOBRUN)
808 {
809  int code, i = ss, j, sign, val, run;
810  int last = FFMIN(se, *last_nnz);
811 
812  OPEN_READER(re, &s->gb);
813  if (*EOBRUN) {
814  (*EOBRUN)--;
815  } else {
816  for (; ; i++) {
817  UPDATE_CACHE(re, &s->gb);
818  GET_VLC(code, re, &s->gb, s->vlcs[2][ac_index].table, 9, 2);
819 
820  if (code & 0xF) {
821  run = ((unsigned) code) >> 4;
822  UPDATE_CACHE(re, &s->gb);
823  val = SHOW_UBITS(re, &s->gb, 1);
824  LAST_SKIP_BITS(re, &s->gb, 1);
825  ZERO_RUN;
826  j = s->scantable.permutated[i];
827  val--;
828  block[j] = ((quant_matrix[j]^val) - val) << Al;
829  if (i == se) {
830  if (i > *last_nnz)
831  *last_nnz = i;
832  CLOSE_READER(re, &s->gb);
833  return 0;
834  }
835  } else {
836  run = ((unsigned) code) >> 4;
837  if (run == 0xF) {
838  ZERO_RUN;
839  } else {
840  val = run;
841  run = (1 << run);
842  if (val) {
843  UPDATE_CACHE(re, &s->gb);
844  run += SHOW_UBITS(re, &s->gb, val);
845  LAST_SKIP_BITS(re, &s->gb, val);
846  }
847  *EOBRUN = run - 1;
848  break;
849  }
850  }
851  }
852 
853  if (i > *last_nnz)
854  *last_nnz = i;
855  }
856 
857  for (; i <= last; i++) {
858  j = s->scantable.permutated[i];
859  if (block[j])
860  REFINE_BIT(j)
861  }
862  CLOSE_READER(re, &s->gb);
863 
864  return 0;
865 }
866 #undef REFINE_BIT
867 #undef ZERO_RUN
868 
869 static int handle_rstn(MJpegDecodeContext *s, int nb_components)
870 {
871  int i;
872  int reset = 0;
873 
874  if (s->restart_interval) {
875  s->restart_count--;
876  if(s->restart_count == 0 && s->avctx->codec_id == AV_CODEC_ID_THP){
877  align_get_bits(&s->gb);
878  for (i = 0; i < nb_components; i++) /* reset dc */
879  s->last_dc[i] = (4 << s->bits);
880  }
881 
882  i = 8 + ((-get_bits_count(&s->gb)) & 7);
883  /* skip RSTn */
884  if (s->restart_count == 0) {
885  if( show_bits(&s->gb, i) == (1 << i) - 1
886  || show_bits(&s->gb, i) == 0xFF) {
887  int pos = get_bits_count(&s->gb);
888  align_get_bits(&s->gb);
889  while (get_bits_left(&s->gb) >= 8 && show_bits(&s->gb, 8) == 0xFF)
890  skip_bits(&s->gb, 8);
891  if (get_bits_left(&s->gb) >= 8 && (get_bits(&s->gb, 8) & 0xF8) == 0xD0) {
892  for (i = 0; i < nb_components; i++) /* reset dc */
893  s->last_dc[i] = (4 << s->bits);
894  reset = 1;
895  } else
896  skip_bits_long(&s->gb, pos - get_bits_count(&s->gb));
897  }
898  }
899  }
900  return reset;
901 }
902 
903 static int ljpeg_decode_rgb_scan(MJpegDecodeContext *s, int nb_components, int predictor, int point_transform)
904 {
905  int i, mb_x, mb_y;
906  uint16_t (*buffer)[4];
907  int left[4], top[4], topleft[4];
908  const int linesize = s->linesize[0];
909  const int mask = ((1 << s->bits) - 1) << point_transform;
910  int resync_mb_y = 0;
911  int resync_mb_x = 0;
912 
913  if (s->nb_components != 3 && s->nb_components != 4)
914  return AVERROR_INVALIDDATA;
915  if (s->v_max != 1 || s->h_max != 1 || !s->lossless)
916  return AVERROR_INVALIDDATA;
917 
918 
919  s->restart_count = s->restart_interval;
920 
921  av_fast_malloc(&s->ljpeg_buffer, &s->ljpeg_buffer_size,
922  (unsigned)s->mb_width * 4 * sizeof(s->ljpeg_buffer[0][0]));
923  buffer = s->ljpeg_buffer;
924 
925  for (i = 0; i < 4; i++)
926  buffer[0][i] = 1 << (s->bits - 1);
927 
928  for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
929  uint8_t *ptr = s->picture_ptr->data[0] + (linesize * mb_y);
930 
931  if (s->interlaced && s->bottom_field)
932  ptr += linesize >> 1;
933 
934  for (i = 0; i < 4; i++)
935  top[i] = left[i] = topleft[i] = buffer[0][i];
936 
937  for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
938  int modified_predictor = predictor;
939 
940  if (s->restart_interval && !s->restart_count){
941  s->restart_count = s->restart_interval;
942  resync_mb_x = mb_x;
943  resync_mb_y = mb_y;
944  for(i=0; i<4; i++)
945  top[i] = left[i]= topleft[i]= 1 << (s->bits - 1);
946  }
947  if (mb_y == resync_mb_y || mb_y == resync_mb_y+1 && mb_x < resync_mb_x || !mb_x)
948  modified_predictor = 1;
949 
950  for (i=0;i<nb_components;i++) {
951  int pred, dc;
952 
953  topleft[i] = top[i];
954  top[i] = buffer[mb_x][i];
955 
956  PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
957 
958  dc = mjpeg_decode_dc(s, s->dc_index[i]);
959  if(dc == 0xFFFFF)
960  return -1;
961 
962  left[i] = buffer[mb_x][i] =
963  mask & (pred + (dc << point_transform));
964  }
965 
966  if (s->restart_interval && !--s->restart_count) {
967  align_get_bits(&s->gb);
968  skip_bits(&s->gb, 16); /* skip RSTn */
969  }
970  }
971  if (s->nb_components == 4) {
972  for(i=0; i<nb_components; i++) {
973  int c= s->comp_index[i];
974  if (s->bits <= 8) {
975  for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
976  ptr[4*mb_x+3-c] = buffer[mb_x][i];
977  }
978  } else if(s->bits == 9) {
979  return AVERROR_PATCHWELCOME;
980  } else {
981  for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
982  ((uint16_t*)ptr)[4*mb_x+c] = buffer[mb_x][i];
983  }
984  }
985  }
986  } else if (s->rct) {
987  for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
988  ptr[3*mb_x + 1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2] - 0x200) >> 2);
989  ptr[3*mb_x + 0] = buffer[mb_x][1] + ptr[3*mb_x + 1];
990  ptr[3*mb_x + 2] = buffer[mb_x][2] + ptr[3*mb_x + 1];
991  }
992  } else if (s->pegasus_rct) {
993  for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
994  ptr[3*mb_x + 1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2]) >> 2);
995  ptr[3*mb_x + 0] = buffer[mb_x][1] + ptr[3*mb_x + 1];
996  ptr[3*mb_x + 2] = buffer[mb_x][2] + ptr[3*mb_x + 1];
997  }
998  } else {
999  for(i=0; i<nb_components; i++) {
1000  int c= s->comp_index[i];
1001  if (s->bits <= 8) {
1002  for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
1003  ptr[3*mb_x+2-c] = buffer[mb_x][i];
1004  }
1005  } else if(s->bits == 9) {
1006  return AVERROR_PATCHWELCOME;
1007  } else {
1008  for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
1009  ((uint16_t*)ptr)[3*mb_x+2-c] = buffer[mb_x][i];
1010  }
1011  }
1012  }
1013  }
1014  }
1015  return 0;
1016 }
1017 
1018 static int ljpeg_decode_yuv_scan(MJpegDecodeContext *s, int predictor,
1019  int point_transform, int nb_components)
1020 {
1021  int i, mb_x, mb_y, mask;
1022  int bits= (s->bits+7)&~7;
1023  int resync_mb_y = 0;
1024  int resync_mb_x = 0;
1025 
1026  point_transform += bits - s->bits;
1027  mask = ((1 << s->bits) - 1) << point_transform;
1028 
1029  av_assert0(nb_components>=1 && nb_components<=4);
1030 
1031  for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
1032  for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
1033  if (s->restart_interval && !s->restart_count){
1034  s->restart_count = s->restart_interval;
1035  resync_mb_x = mb_x;
1036  resync_mb_y = mb_y;
1037  }
1038 
1039  if(!mb_x || mb_y == resync_mb_y || mb_y == resync_mb_y+1 && mb_x < resync_mb_x || s->interlaced){
1040  int toprow = mb_y == resync_mb_y || mb_y == resync_mb_y+1 && mb_x < resync_mb_x;
1041  int leftcol = !mb_x || mb_y == resync_mb_y && mb_x == resync_mb_x;
1042  for (i = 0; i < nb_components; i++) {
1043  uint8_t *ptr;
1044  uint16_t *ptr16;
1045  int n, h, v, x, y, c, j, linesize;
1046  n = s->nb_blocks[i];
1047  c = s->comp_index[i];
1048  h = s->h_scount[i];
1049  v = s->v_scount[i];
1050  x = 0;
1051  y = 0;
1052  linesize= s->linesize[c];
1053 
1054  if(bits>8) linesize /= 2;
1055 
1056  for(j=0; j<n; j++) {
1057  int pred, dc;
1058 
1059  dc = mjpeg_decode_dc(s, s->dc_index[i]);
1060  if(dc == 0xFFFFF)
1061  return -1;
1062  if(bits<=8){
1063  ptr = s->picture_ptr->data[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
1064  if(y==0 && toprow){
1065  if(x==0 && leftcol){
1066  pred= 1 << (bits - 1);
1067  }else{
1068  pred= ptr[-1];
1069  }
1070  }else{
1071  if(x==0 && leftcol){
1072  pred= ptr[-linesize];
1073  }else{
1074  PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
1075  }
1076  }
1077 
1078  if (s->interlaced && s->bottom_field)
1079  ptr += linesize >> 1;
1080  pred &= mask;
1081  *ptr= pred + (dc << point_transform);
1082  }else{
1083  ptr16 = (uint16_t*)(s->picture_ptr->data[c] + 2*(linesize * (v * mb_y + y)) + 2*(h * mb_x + x)); //FIXME optimize this crap
1084  if(y==0 && toprow){
1085  if(x==0 && leftcol){
1086  pred= 1 << (bits - 1);
1087  }else{
1088  pred= ptr16[-1];
1089  }
1090  }else{
1091  if(x==0 && leftcol){
1092  pred= ptr16[-linesize];
1093  }else{
1094  PREDICT(pred, ptr16[-linesize-1], ptr16[-linesize], ptr16[-1], predictor);
1095  }
1096  }
1097 
1098  if (s->interlaced && s->bottom_field)
1099  ptr16 += linesize >> 1;
1100  pred &= mask;
1101  *ptr16= pred + (dc << point_transform);
1102  }
1103  if (++x == h) {
1104  x = 0;
1105  y++;
1106  }
1107  }
1108  }
1109  } else {
1110  for (i = 0; i < nb_components; i++) {
1111  uint8_t *ptr;
1112  uint16_t *ptr16;
1113  int n, h, v, x, y, c, j, linesize, dc;
1114  n = s->nb_blocks[i];
1115  c = s->comp_index[i];
1116  h = s->h_scount[i];
1117  v = s->v_scount[i];
1118  x = 0;
1119  y = 0;
1120  linesize = s->linesize[c];
1121 
1122  if(bits>8) linesize /= 2;
1123 
1124  for (j = 0; j < n; j++) {
1125  int pred;
1126 
1127  dc = mjpeg_decode_dc(s, s->dc_index[i]);
1128  if(dc == 0xFFFFF)
1129  return -1;
1130  if(bits<=8){
1131  ptr = s->picture_ptr->data[c] +
1132  (linesize * (v * mb_y + y)) +
1133  (h * mb_x + x); //FIXME optimize this crap
1134  PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
1135 
1136  pred &= mask;
1137  *ptr = pred + (dc << point_transform);
1138  }else{
1139  ptr16 = (uint16_t*)(s->picture_ptr->data[c] + 2*(linesize * (v * mb_y + y)) + 2*(h * mb_x + x)); //FIXME optimize this crap
1140  PREDICT(pred, ptr16[-linesize-1], ptr16[-linesize], ptr16[-1], predictor);
1141 
1142  pred &= mask;
1143  *ptr16= pred + (dc << point_transform);
1144  }
1145 
1146  if (++x == h) {
1147  x = 0;
1148  y++;
1149  }
1150  }
1151  }
1152  }
1153  if (s->restart_interval && !--s->restart_count) {
1154  align_get_bits(&s->gb);
1155  skip_bits(&s->gb, 16); /* skip RSTn */
1156  }
1157  }
1158  }
1159  return 0;
1160 }
1161 
1162 static av_always_inline void mjpeg_copy_block(MJpegDecodeContext *s,
1163  uint8_t *dst, const uint8_t *src,
1164  int linesize, int lowres)
1165 {
1166  switch (lowres) {
1167  case 0: s->hdsp.put_pixels_tab[1][0](dst, src, linesize, 8);
1168  break;
1169  case 1: copy_block4(dst, src, linesize, linesize, 4);
1170  break;
1171  case 2: copy_block2(dst, src, linesize, linesize, 2);
1172  break;
1173  case 3: *dst = *src;
1174  break;
1175  }
1176 }
1177 
1178 static void shift_output(MJpegDecodeContext *s, uint8_t *ptr, int linesize)
1179 {
1180  int block_x, block_y;
1181  int size = 8 >> s->avctx->lowres;
1182  if (s->bits > 8) {
1183  for (block_y=0; block_y<size; block_y++)
1184  for (block_x=0; block_x<size; block_x++)
1185  *(uint16_t*)(ptr + 2*block_x + block_y*linesize) <<= 16 - s->bits;
1186  } else {
1187  for (block_y=0; block_y<size; block_y++)
1188  for (block_x=0; block_x<size; block_x++)
1189  *(ptr + block_x + block_y*linesize) <<= 8 - s->bits;
1190  }
1191 }
1192 
1193 static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int Ah,
1194  int Al, const uint8_t *mb_bitmask,
1195  int mb_bitmask_size,
1196  const AVFrame *reference)
1197 {
1198  int i, mb_x, mb_y;
1199  uint8_t *data[MAX_COMPONENTS];
1200  const uint8_t *reference_data[MAX_COMPONENTS];
1201  int linesize[MAX_COMPONENTS];
1202  GetBitContext mb_bitmask_gb = {0}; // initialize to silence gcc warning
1203  int bytes_per_pixel = 1 + (s->bits > 8);
1204 
1205  if (mb_bitmask) {
1206  if (mb_bitmask_size != (s->mb_width * s->mb_height + 7)>>3) {
1207  av_log(s->avctx, AV_LOG_ERROR, "mb_bitmask_size mismatches\n");
1208  return AVERROR_INVALIDDATA;
1209  }
1210  init_get_bits(&mb_bitmask_gb, mb_bitmask, s->mb_width * s->mb_height);
1211  }
1212 
1213  s->restart_count = 0;
1214 
1215  for (i = 0; i < nb_components; i++) {
1216  int c = s->comp_index[i];
1217  data[c] = s->picture_ptr->data[c];
1218  reference_data[c] = reference ? reference->data[c] : NULL;
1219  linesize[c] = s->linesize[c];
1220  s->coefs_finished[c] |= 1;
1221  }
1222 
1223  for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
1224  for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
1225  const int copy_mb = mb_bitmask && !get_bits1(&mb_bitmask_gb);
1226 
1227  if (s->restart_interval && !s->restart_count)
1228  s->restart_count = s->restart_interval;
1229 
1230  if (get_bits_left(&s->gb) < 0) {
1231  av_log(s->avctx, AV_LOG_ERROR, "overread %d\n",
1232  -get_bits_left(&s->gb));
1233  return AVERROR_INVALIDDATA;
1234  }
1235  for (i = 0; i < nb_components; i++) {
1236  uint8_t *ptr;
1237  int n, h, v, x, y, c, j;
1238  int block_offset;
1239  n = s->nb_blocks[i];
1240  c = s->comp_index[i];
1241  h = s->h_scount[i];
1242  v = s->v_scount[i];
1243  x = 0;
1244  y = 0;
1245  for (j = 0; j < n; j++) {
1246  block_offset = (((linesize[c] * (v * mb_y + y) * 8) +
1247  (h * mb_x + x) * 8 * bytes_per_pixel) >> s->avctx->lowres);
1248 
1249  if (s->interlaced && s->bottom_field)
1250  block_offset += linesize[c] >> 1;
1251  ptr = data[c] + block_offset;
1252  if (!s->progressive) {
1253  if (copy_mb)
1254  mjpeg_copy_block(s, ptr, reference_data[c] + block_offset,
1255  linesize[c], s->avctx->lowres);
1256 
1257  else {
1258  s->bdsp.clear_block(s->block);
1259  if (decode_block(s, s->block, i,
1260  s->dc_index[i], s->ac_index[i],
1261  s->quant_matrixes[s->quant_sindex[i]]) < 0) {
1262  av_log(s->avctx, AV_LOG_ERROR,
1263  "error y=%d x=%d\n", mb_y, mb_x);
1264  return AVERROR_INVALIDDATA;
1265  }
1266  s->idsp.idct_put(ptr, linesize[c], s->block);
1267  if (s->bits & 7)
1268  shift_output(s, ptr, linesize[c]);
1269  }
1270  } else {
1271  int block_idx = s->block_stride[c] * (v * mb_y + y) +
1272  (h * mb_x + x);
1273  int16_t *block = s->blocks[c][block_idx];
1274  if (Ah)
1275  block[0] += get_bits1(&s->gb) *
1276  s->quant_matrixes[s->quant_sindex[i]][0] << Al;
1277  else if (decode_dc_progressive(s, block, i, s->dc_index[i],
1278  s->quant_matrixes[s->quant_sindex[i]],
1279  Al) < 0) {
1280  av_log(s->avctx, AV_LOG_ERROR,
1281  "error y=%d x=%d\n", mb_y, mb_x);
1282  return AVERROR_INVALIDDATA;
1283  }
1284  }
1285  av_dlog(s->avctx, "mb: %d %d processed\n", mb_y, mb_x);
1286  av_dlog(s->avctx, "%d %d %d %d %d %d %d %d \n",
1287  mb_x, mb_y, x, y, c, s->bottom_field,
1288  (v * mb_y + y) * 8, (h * mb_x + x) * 8);
1289  if (++x == h) {
1290  x = 0;
1291  y++;
1292  }
1293  }
1294  }
1295 
1296  handle_rstn(s, nb_components);
1297  }
1298  }
1299  return 0;
1300 }
1301 
1302 static int mjpeg_decode_scan_progressive_ac(MJpegDecodeContext *s, int ss,
1303  int se, int Ah, int Al)
1304 {
1305  int mb_x, mb_y;
1306  int EOBRUN = 0;
1307  int c = s->comp_index[0];
1308  uint8_t *data = s->picture_ptr->data[c];
1309  int linesize = s->linesize[c];
1310  int last_scan = 0;
1311  int16_t *quant_matrix = s->quant_matrixes[s->quant_sindex[0]];
1312  int bytes_per_pixel = 1 + (s->bits > 8);
1313 
1314  av_assert0(ss>=0 && Ah>=0 && Al>=0);
1315  if (se < ss || se > 63) {
1316  av_log(s->avctx, AV_LOG_ERROR, "SS/SE %d/%d is invalid\n", ss, se);
1317  return AVERROR_INVALIDDATA;
1318  }
1319 
1320  if (!Al) {
1321  // s->coefs_finished is a bitmask for coefficients coded
1322  // ss and se are parameters telling start and end coefficients
1323  s->coefs_finished[c] |= (2ULL << se) - (1ULL << ss);
1324  last_scan = !~s->coefs_finished[c];
1325  }
1326 
1327  if (s->interlaced && s->bottom_field)
1328  data += linesize >> 1;
1329 
1330  s->restart_count = 0;
1331 
1332  for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
1333  uint8_t *ptr = data + (mb_y * linesize * 8 >> s->avctx->lowres);
1334  int block_idx = mb_y * s->block_stride[c];
1335  int16_t (*block)[64] = &s->blocks[c][block_idx];
1336  uint8_t *last_nnz = &s->last_nnz[c][block_idx];
1337  for (mb_x = 0; mb_x < s->mb_width; mb_x++, block++, last_nnz++) {
1338  int ret;
1339  if (s->restart_interval && !s->restart_count)
1340  s->restart_count = s->restart_interval;
1341 
1342  if (Ah)
1343  ret = decode_block_refinement(s, *block, last_nnz, s->ac_index[0],
1344  quant_matrix, ss, se, Al, &EOBRUN);
1345  else
1346  ret = decode_block_progressive(s, *block, last_nnz, s->ac_index[0],
1347  quant_matrix, ss, se, Al, &EOBRUN);
1348  if (ret < 0) {
1349  av_log(s->avctx, AV_LOG_ERROR,
1350  "error y=%d x=%d\n", mb_y, mb_x);
1351  return AVERROR_INVALIDDATA;
1352  }
1353 
1354  if (last_scan) {
1355  s->idsp.idct_put(ptr, linesize, *block);
1356  if (s->bits & 7)
1357  shift_output(s, ptr, linesize);
1358  ptr += bytes_per_pixel*8 >> s->avctx->lowres;
1359  }
1360  if (handle_rstn(s, 0))
1361  EOBRUN = 0;
1362  }
1363  }
1364  return 0;
1365 }
1366 
1367 int ff_mjpeg_decode_sos(MJpegDecodeContext *s, const uint8_t *mb_bitmask,
1368  int mb_bitmask_size, const AVFrame *reference)
1369 {
1370  int len, nb_components, i, h, v, predictor, point_transform;
1371  int index, id, ret;
1372  const int block_size = s->lossless ? 1 : 8;
1373  int ilv, prev_shift;
1374 
1375  if (!s->got_picture) {
1376  av_log(s->avctx, AV_LOG_WARNING,
1377  "Can not process SOS before SOF, skipping\n");
1378  return -1;
1379  }
1380 
1381  av_assert0(s->picture_ptr->data[0]);
1382  /* XXX: verify len field validity */
1383  len = get_bits(&s->gb, 16);
1384  nb_components = get_bits(&s->gb, 8);
1385  if (nb_components == 0 || nb_components > MAX_COMPONENTS) {
1386  av_log(s->avctx, AV_LOG_ERROR,
1387  "decode_sos: nb_components (%d) unsupported\n", nb_components);
1388  return AVERROR_PATCHWELCOME;
1389  }
1390  if (len != 6 + 2 * nb_components) {
1391  av_log(s->avctx, AV_LOG_ERROR, "decode_sos: invalid len (%d)\n", len);
1392  return AVERROR_INVALIDDATA;
1393  }
1394  for (i = 0; i < nb_components; i++) {
1395  id = get_bits(&s->gb, 8) - 1;
1396  av_log(s->avctx, AV_LOG_DEBUG, "component: %d\n", id);
1397  /* find component index */
1398  for (index = 0; index < s->nb_components; index++)
1399  if (id == s->component_id[index])
1400  break;
1401  if (index == s->nb_components) {
1402  av_log(s->avctx, AV_LOG_ERROR,
1403  "decode_sos: index(%d) out of components\n", index);
1404  return AVERROR_INVALIDDATA;
1405  }
1406  /* Metasoft MJPEG codec has Cb and Cr swapped */
1407  if (s->avctx->codec_tag == MKTAG('M', 'T', 'S', 'J')
1408  && nb_components == 3 && s->nb_components == 3 && i)
1409  index = 3 - i;
1410 
1411  s->quant_sindex[i] = s->quant_index[index];
1412  s->nb_blocks[i] = s->h_count[index] * s->v_count[index];
1413  s->h_scount[i] = s->h_count[index];
1414  s->v_scount[i] = s->v_count[index];
1415 
1416  if(nb_components == 3 && s->nb_components == 3 && s->avctx->pix_fmt == AV_PIX_FMT_GBR24P)
1417  index = (i+2)%3;
1418  if(nb_components == 1 && s->nb_components == 3 && s->avctx->pix_fmt == AV_PIX_FMT_GBR24P)
1419  index = (index+2)%3;
1420 
1421  s->comp_index[i] = index;
1422 
1423  s->dc_index[i] = get_bits(&s->gb, 4);
1424  s->ac_index[i] = get_bits(&s->gb, 4);
1425 
1426  if (s->dc_index[i] < 0 || s->ac_index[i] < 0 ||
1427  s->dc_index[i] >= 4 || s->ac_index[i] >= 4)
1428  goto out_of_range;
1429  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))
1430  goto out_of_range;
1431  }
1432 
1433  predictor = get_bits(&s->gb, 8); /* JPEG Ss / lossless JPEG predictor /JPEG-LS NEAR */
1434  ilv = get_bits(&s->gb, 8); /* JPEG Se / JPEG-LS ILV */
1435  if(s->avctx->codec_tag != AV_RL32("CJPG")){
1436  prev_shift = get_bits(&s->gb, 4); /* Ah */
1437  point_transform = get_bits(&s->gb, 4); /* Al */
1438  }else
1439  prev_shift = point_transform = 0;
1440 
1441  if (nb_components > 1) {
1442  /* interleaved stream */
1443  s->mb_width = (s->width + s->h_max * block_size - 1) / (s->h_max * block_size);
1444  s->mb_height = (s->height + s->v_max * block_size - 1) / (s->v_max * block_size);
1445  } else if (!s->ls) { /* skip this for JPEG-LS */
1446  h = s->h_max / s->h_scount[0];
1447  v = s->v_max / s->v_scount[0];
1448  s->mb_width = (s->width + h * block_size - 1) / (h * block_size);
1449  s->mb_height = (s->height + v * block_size - 1) / (v * block_size);
1450  s->nb_blocks[0] = 1;
1451  s->h_scount[0] = 1;
1452  s->v_scount[0] = 1;
1453  }
1454 
1455  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1456  av_log(s->avctx, AV_LOG_DEBUG, "%s %s p:%d >>:%d ilv:%d bits:%d skip:%d %s comp:%d\n",
1457  s->lossless ? "lossless" : "sequential DCT", s->rgb ? "RGB" : "",
1458  predictor, point_transform, ilv, s->bits, s->mjpb_skiptosod,
1459  s->pegasus_rct ? "PRCT" : (s->rct ? "RCT" : ""), nb_components);
1460 
1461 
1462  /* mjpeg-b can have padding bytes between sos and image data, skip them */
1463  for (i = s->mjpb_skiptosod; i > 0; i--)
1464  skip_bits(&s->gb, 8);
1465 
1466 next_field:
1467  for (i = 0; i < nb_components; i++)
1468  s->last_dc[i] = (4 << s->bits);
1469 
1470  if (s->lossless) {
1471  av_assert0(s->picture_ptr == s->picture);
1472  if (CONFIG_JPEGLS_DECODER && s->ls) {
1473 // for () {
1474 // reset_ls_coding_parameters(s, 0);
1475 
1476  if ((ret = ff_jpegls_decode_picture(s, predictor,
1477  point_transform, ilv)) < 0)
1478  return ret;
1479  } else {
1480  if (s->rgb) {
1481  if ((ret = ljpeg_decode_rgb_scan(s, nb_components, predictor, point_transform)) < 0)
1482  return ret;
1483  } else {
1484  if ((ret = ljpeg_decode_yuv_scan(s, predictor,
1485  point_transform,
1486  nb_components)) < 0)
1487  return ret;
1488  }
1489  }
1490  } else {
1491  if (s->progressive && predictor) {
1492  av_assert0(s->picture_ptr == s->picture);
1493  if ((ret = mjpeg_decode_scan_progressive_ac(s, predictor,
1494  ilv, prev_shift,
1495  point_transform)) < 0)
1496  return ret;
1497  } else {
1498  if ((ret = mjpeg_decode_scan(s, nb_components,
1499  prev_shift, point_transform,
1500  mb_bitmask, mb_bitmask_size, reference)) < 0)
1501  return ret;
1502  }
1503  }
1504 
1505  if (s->interlaced &&
1506  get_bits_left(&s->gb) > 32 &&
1507  show_bits(&s->gb, 8) == 0xFF) {
1508  GetBitContext bak = s->gb;
1509  align_get_bits(&bak);
1510  if (show_bits(&bak, 16) == 0xFFD1) {
1511  av_log(s->avctx, AV_LOG_DEBUG, "AVRn interlaced picture marker found\n");
1512  s->gb = bak;
1513  skip_bits(&s->gb, 16);
1514  s->bottom_field ^= 1;
1515 
1516  goto next_field;
1517  }
1518  }
1519 
1520  emms_c();
1521  return 0;
1522  out_of_range:
1523  av_log(s->avctx, AV_LOG_ERROR, "decode_sos: ac/dc index out of range\n");
1524  return AVERROR_INVALIDDATA;
1525 }
1526 
1527 static int mjpeg_decode_dri(MJpegDecodeContext *s)
1528 {
1529  if (get_bits(&s->gb, 16) != 4)
1530  return AVERROR_INVALIDDATA;
1531  s->restart_interval = get_bits(&s->gb, 16);
1532  s->restart_count = 0;
1533  av_log(s->avctx, AV_LOG_DEBUG, "restart interval: %d\n",
1534  s->restart_interval);
1535 
1536  return 0;
1537 }
1538 
1539 static int mjpeg_decode_app(MJpegDecodeContext *s)
1540 {
1541  int len, id, i;
1542 
1543  len = get_bits(&s->gb, 16);
1544  if (len < 6)
1545  return AVERROR_INVALIDDATA;
1546  if (8 * len > get_bits_left(&s->gb))
1547  return AVERROR_INVALIDDATA;
1548 
1549  id = get_bits_long(&s->gb, 32);
1550  len -= 6;
1551 
1552  if (s->avctx->debug & FF_DEBUG_STARTCODE) {
1553  char id_str[32];
1554  av_get_codec_tag_string(id_str, sizeof(id_str), av_bswap32(id));
1555  av_log(s->avctx, AV_LOG_DEBUG, "APPx (%s / %8X) len=%d\n", id_str, id, len);
1556  }
1557 
1558  /* Buggy AVID, it puts EOI only at every 10th frame. */
1559  /* Also, this fourcc is used by non-avid files too, it holds some
1560  information, but it's always present in AVID-created files. */
1561  if (id == AV_RB32("AVI1")) {
1562  /* structure:
1563  4bytes AVI1
1564  1bytes polarity
1565  1bytes always zero
1566  4bytes field_size
1567  4bytes field_size_less_padding
1568  */
1569  s->buggy_avid = 1;
1570  i = get_bits(&s->gb, 8); len--;
1571  av_log(s->avctx, AV_LOG_DEBUG, "polarity %d\n", i);
1572 #if 0
1573  skip_bits(&s->gb, 8);
1574  skip_bits(&s->gb, 32);
1575  skip_bits(&s->gb, 32);
1576  len -= 10;
1577 #endif
1578  goto out;
1579  }
1580 
1581 // len -= 2;
1582 
1583  if (id == AV_RB32("JFIF")) {
1584  int t_w, t_h, v1, v2;
1585  skip_bits(&s->gb, 8); /* the trailing zero-byte */
1586  v1 = get_bits(&s->gb, 8);
1587  v2 = get_bits(&s->gb, 8);
1588  skip_bits(&s->gb, 8);
1589 
1590  s->avctx->sample_aspect_ratio.num = get_bits(&s->gb, 16);
1591  s->avctx->sample_aspect_ratio.den = get_bits(&s->gb, 16);
1592  ff_set_sar(s->avctx, s->avctx->sample_aspect_ratio);
1593 
1594  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1595  av_log(s->avctx, AV_LOG_INFO,
1596  "mjpeg: JFIF header found (version: %x.%x) SAR=%d/%d\n",
1597  v1, v2,
1598  s->avctx->sample_aspect_ratio.num,
1599  s->avctx->sample_aspect_ratio.den);
1600 
1601  t_w = get_bits(&s->gb, 8);
1602  t_h = get_bits(&s->gb, 8);
1603  if (t_w && t_h) {
1604  /* skip thumbnail */
1605  if (len -10 - (t_w * t_h * 3) > 0)
1606  len -= t_w * t_h * 3;
1607  }
1608  len -= 10;
1609  goto out;
1610  }
1611 
1612  if (id == AV_RB32("Adob") && (get_bits(&s->gb, 8) == 'e')) {
1613  skip_bits(&s->gb, 16); /* version */
1614  skip_bits(&s->gb, 16); /* flags0 */
1615  skip_bits(&s->gb, 16); /* flags1 */
1616  s->adobe_transform = get_bits(&s->gb, 8);
1617  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1618  av_log(s->avctx, AV_LOG_INFO, "mjpeg: Adobe header found, transform=%d\n", s->adobe_transform);
1619  len -= 7;
1620  goto out;
1621  }
1622 
1623  if (id == AV_RB32("LJIF")) {
1624  int rgb = s->rgb;
1625  int pegasus_rct = s->pegasus_rct;
1626  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1627  av_log(s->avctx, AV_LOG_INFO,
1628  "Pegasus lossless jpeg header found\n");
1629  skip_bits(&s->gb, 16); /* version ? */
1630  skip_bits(&s->gb, 16); /* unknown always 0? */
1631  skip_bits(&s->gb, 16); /* unknown always 0? */
1632  skip_bits(&s->gb, 16); /* unknown always 0? */
1633  switch (i=get_bits(&s->gb, 8)) {
1634  case 1:
1635  rgb = 1;
1636  pegasus_rct = 0;
1637  break;
1638  case 2:
1639  rgb = 1;
1640  pegasus_rct = 1;
1641  break;
1642  default:
1643  av_log(s->avctx, AV_LOG_ERROR, "unknown colorspace %d\n", i);
1644  }
1645 
1646  len -= 9;
1647  if (s->got_picture)
1648  if (rgb != s->rgb || pegasus_rct != s->pegasus_rct) {
1649  av_log(s->avctx, AV_LOG_WARNING, "Mismatching LJIF tag\n");
1650  goto out;
1651  }
1652 
1653  s->rgb = rgb;
1654  s->pegasus_rct = pegasus_rct;
1655 
1656  goto out;
1657  }
1658  if (id == AV_RL32("colr") && len > 0) {
1659  s->colr = get_bits(&s->gb, 8);
1660  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1661  av_log(s->avctx, AV_LOG_INFO, "COLR %d\n", s->colr);
1662  len --;
1663  goto out;
1664  }
1665  if (id == AV_RL32("xfrm") && len > 0) {
1666  s->xfrm = get_bits(&s->gb, 8);
1667  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1668  av_log(s->avctx, AV_LOG_INFO, "XFRM %d\n", s->xfrm);
1669  len --;
1670  goto out;
1671  }
1672 
1673  /* JPS extension by VRex */
1674  if (s->start_code == APP3 && id == AV_RB32("_JPS") && len >= 10) {
1675  int flags, layout, type;
1676  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1677  av_log(s->avctx, AV_LOG_INFO, "_JPSJPS_\n");
1678 
1679  skip_bits(&s->gb, 32); len -= 4; /* JPS_ */
1680  skip_bits(&s->gb, 16); len -= 2; /* block length */
1681  skip_bits(&s->gb, 8); /* reserved */
1682  flags = get_bits(&s->gb, 8);
1683  layout = get_bits(&s->gb, 8);
1684  type = get_bits(&s->gb, 8);
1685  len -= 4;
1686 
1687  s->stereo3d = av_stereo3d_alloc();
1688  if (!s->stereo3d) {
1689  goto out;
1690  }
1691  if (type == 0) {
1692  s->stereo3d->type = AV_STEREO3D_2D;
1693  } else if (type == 1) {
1694  switch (layout) {
1695  case 0x01:
1696  s->stereo3d->type = AV_STEREO3D_LINES;
1697  break;
1698  case 0x02:
1699  s->stereo3d->type = AV_STEREO3D_SIDEBYSIDE;
1700  break;
1701  case 0x03:
1702  s->stereo3d->type = AV_STEREO3D_TOPBOTTOM;
1703  break;
1704  }
1705  if (!(flags & 0x04)) {
1706  s->stereo3d->flags = AV_STEREO3D_FLAG_INVERT;
1707  }
1708  }
1709  goto out;
1710  }
1711 
1712  /* EXIF metadata */
1713  if (s->start_code == APP1 && id == AV_RB32("Exif") && len >= 2) {
1714  GetByteContext gbytes;
1715  int ret, le, ifd_offset, bytes_read;
1716  const uint8_t *aligned;
1717 
1718  skip_bits(&s->gb, 16); // skip padding
1719  len -= 2;
1720 
1721  // init byte wise reading
1722  aligned = align_get_bits(&s->gb);
1723  bytestream2_init(&gbytes, aligned, len);
1724 
1725  // read TIFF header
1726  ret = ff_tdecode_header(&gbytes, &le, &ifd_offset);
1727  if (ret) {
1728  av_log(s->avctx, AV_LOG_ERROR, "mjpeg: invalid TIFF header in EXIF data\n");
1729  } else {
1730  bytestream2_seek(&gbytes, ifd_offset, SEEK_SET);
1731 
1732  // read 0th IFD and store the metadata
1733  // (return values > 0 indicate the presence of subimage metadata)
1734  ret = avpriv_exif_decode_ifd(s->avctx, &gbytes, le, 0, &s->exif_metadata);
1735  if (ret < 0) {
1736  av_log(s->avctx, AV_LOG_ERROR, "mjpeg: error decoding EXIF data\n");
1737  }
1738  }
1739 
1740  bytes_read = bytestream2_tell(&gbytes);
1741  skip_bits(&s->gb, bytes_read << 3);
1742  len -= bytes_read;
1743 
1744  goto out;
1745  }
1746 
1747  /* Apple MJPEG-A */
1748  if ((s->start_code == APP1) && (len > (0x28 - 8))) {
1749  id = get_bits_long(&s->gb, 32);
1750  len -= 4;
1751  /* Apple MJPEG-A */
1752  if (id == AV_RB32("mjpg")) {
1753 #if 0
1754  skip_bits(&s->gb, 32); /* field size */
1755  skip_bits(&s->gb, 32); /* pad field size */
1756  skip_bits(&s->gb, 32); /* next off */
1757  skip_bits(&s->gb, 32); /* quant off */
1758  skip_bits(&s->gb, 32); /* huff off */
1759  skip_bits(&s->gb, 32); /* image off */
1760  skip_bits(&s->gb, 32); /* scan off */
1761  skip_bits(&s->gb, 32); /* data off */
1762 #endif
1763  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1764  av_log(s->avctx, AV_LOG_INFO, "mjpeg: Apple MJPEG-A header found\n");
1765  }
1766  }
1767 
1768 out:
1769  /* slow but needed for extreme adobe jpegs */
1770  if (len < 0)
1771  av_log(s->avctx, AV_LOG_ERROR,
1772  "mjpeg: error, decode_app parser read over the end\n");
1773  while (--len > 0)
1774  skip_bits(&s->gb, 8);
1775 
1776  return 0;
1777 }
1778 
1779 static int mjpeg_decode_com(MJpegDecodeContext *s)
1780 {
1781  int len = get_bits(&s->gb, 16);
1782  if (len >= 2 && 8 * len - 16 <= get_bits_left(&s->gb)) {
1783  char *cbuf = av_malloc(len - 1);
1784  if (cbuf) {
1785  int i;
1786  for (i = 0; i < len - 2; i++)
1787  cbuf[i] = get_bits(&s->gb, 8);
1788  if (i > 0 && cbuf[i - 1] == '\n')
1789  cbuf[i - 1] = 0;
1790  else
1791  cbuf[i] = 0;
1792 
1793  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1794  av_log(s->avctx, AV_LOG_INFO, "comment: '%s'\n", cbuf);
1795 
1796  /* buggy avid, it puts EOI only at every 10th frame */
1797  if (!strncmp(cbuf, "AVID", 4)) {
1798  parse_avid(s, cbuf, len);
1799  } else if (!strcmp(cbuf, "CS=ITU601"))
1800  s->cs_itu601 = 1;
1801  else if ((!strncmp(cbuf, "Intel(R) JPEG Library, version 1", 32) && s->avctx->codec_tag) ||
1802  (!strncmp(cbuf, "Metasoft MJPEG Codec", 20)))
1803  s->flipped = 1;
1804 
1805  av_free(cbuf);
1806  }
1807  }
1808 
1809  return 0;
1810 }
1811 
1812 /* return the 8 bit start code value and update the search
1813  state. Return -1 if no start code found */
1814 static int find_marker(const uint8_t **pbuf_ptr, const uint8_t *buf_end)
1815 {
1816  const uint8_t *buf_ptr;
1817  unsigned int v, v2;
1818  int val;
1819  int skipped = 0;
1820 
1821  buf_ptr = *pbuf_ptr;
1822  while (buf_end - buf_ptr > 1) {
1823  v = *buf_ptr++;
1824  v2 = *buf_ptr;
1825  if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe) && buf_ptr < buf_end) {
1826  val = *buf_ptr++;
1827  goto found;
1828  }
1829  skipped++;
1830  }
1831  buf_ptr = buf_end;
1832  val = -1;
1833 found:
1834  av_dlog(NULL, "find_marker skipped %d bytes\n", skipped);
1835  *pbuf_ptr = buf_ptr;
1836  return val;
1837 }
1838 
1839 int ff_mjpeg_find_marker(MJpegDecodeContext *s,
1840  const uint8_t **buf_ptr, const uint8_t *buf_end,
1841  const uint8_t **unescaped_buf_ptr,
1842  int *unescaped_buf_size)
1843 {
1844  int start_code;
1845  start_code = find_marker(buf_ptr, buf_end);
1846 
1847  av_fast_padded_malloc(&s->buffer, &s->buffer_size, buf_end - *buf_ptr);
1848  if (!s->buffer)
1849  return AVERROR(ENOMEM);
1850 
1851  /* unescape buffer of SOS, use special treatment for JPEG-LS */
1852  if (start_code == SOS && !s->ls) {
1853  const uint8_t *src = *buf_ptr;
1854  uint8_t *dst = s->buffer;
1855 
1856  while (src < buf_end) {
1857  uint8_t x = *(src++);
1858 
1859  *(dst++) = x;
1860  if (s->avctx->codec_id != AV_CODEC_ID_THP) {
1861  if (x == 0xff) {
1862  while (src < buf_end && x == 0xff)
1863  x = *(src++);
1864 
1865  if (x >= 0xd0 && x <= 0xd7)
1866  *(dst++) = x;
1867  else if (x)
1868  break;
1869  }
1870  }
1871  }
1872  *unescaped_buf_ptr = s->buffer;
1873  *unescaped_buf_size = dst - s->buffer;
1874  memset(s->buffer + *unescaped_buf_size, 0,
1875  FF_INPUT_BUFFER_PADDING_SIZE);
1876 
1877  av_log(s->avctx, AV_LOG_DEBUG, "escaping removed %"PTRDIFF_SPECIFIER" bytes\n",
1878  (buf_end - *buf_ptr) - (dst - s->buffer));
1879  } else if (start_code == SOS && s->ls) {
1880  const uint8_t *src = *buf_ptr;
1881  uint8_t *dst = s->buffer;
1882  int bit_count = 0;
1883  int t = 0, b = 0;
1884  PutBitContext pb;
1885 
1886  /* find marker */
1887  while (src + t < buf_end) {
1888  uint8_t x = src[t++];
1889  if (x == 0xff) {
1890  while ((src + t < buf_end) && x == 0xff)
1891  x = src[t++];
1892  if (x & 0x80) {
1893  t -= FFMIN(2, t);
1894  break;
1895  }
1896  }
1897  }
1898  bit_count = t * 8;
1899  init_put_bits(&pb, dst, t);
1900 
1901  /* unescape bitstream */
1902  while (b < t) {
1903  uint8_t x = src[b++];
1904  put_bits(&pb, 8, x);
1905  if (x == 0xFF) {
1906  x = src[b++];
1907  put_bits(&pb, 7, x);
1908  bit_count--;
1909  }
1910  }
1911  flush_put_bits(&pb);
1912 
1913  *unescaped_buf_ptr = dst;
1914  *unescaped_buf_size = (bit_count + 7) >> 3;
1915  memset(s->buffer + *unescaped_buf_size, 0,
1916  FF_INPUT_BUFFER_PADDING_SIZE);
1917  } else {
1918  *unescaped_buf_ptr = *buf_ptr;
1919  *unescaped_buf_size = buf_end - *buf_ptr;
1920  }
1921 
1922  return start_code;
1923 }
1924 
1925 int ff_mjpeg_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
1926  AVPacket *avpkt)
1927 {
1928  AVFrame *frame = data;
1929  const uint8_t *buf = avpkt->data;
1930  int buf_size = avpkt->size;
1931  MJpegDecodeContext *s = avctx->priv_data;
1932  const uint8_t *buf_end, *buf_ptr;
1933  const uint8_t *unescaped_buf_ptr;
1934  int hshift, vshift;
1935  int unescaped_buf_size;
1936  int start_code;
1937  int i, index;
1938  int ret = 0;
1939  int is16bit;
1940 
1941  av_dict_free(&s->exif_metadata);
1942  av_freep(&s->stereo3d);
1943  s->adobe_transform = -1;
1944 
1945  buf_ptr = buf;
1946  buf_end = buf + buf_size;
1947  while (buf_ptr < buf_end) {
1948  /* find start next marker */
1949  start_code = ff_mjpeg_find_marker(s, &buf_ptr, buf_end,
1950  &unescaped_buf_ptr,
1951  &unescaped_buf_size);
1952  /* EOF */
1953  if (start_code < 0) {
1954  break;
1955  } else if (unescaped_buf_size > INT_MAX / 8) {
1956  av_log(avctx, AV_LOG_ERROR,
1957  "MJPEG packet 0x%x too big (%d/%d), corrupt data?\n",
1958  start_code, unescaped_buf_size, buf_size);
1959  return AVERROR_INVALIDDATA;
1960  }
1961  av_log(avctx, AV_LOG_DEBUG, "marker=%x avail_size_in_buf=%"PTRDIFF_SPECIFIER"\n",
1962  start_code, buf_end - buf_ptr);
1963 
1964  ret = init_get_bits8(&s->gb, unescaped_buf_ptr, unescaped_buf_size);
1965 
1966  if (ret < 0) {
1967  av_log(avctx, AV_LOG_ERROR, "invalid buffer\n");
1968  goto fail;
1969  }
1970 
1971  s->start_code = start_code;
1972  if (s->avctx->debug & FF_DEBUG_STARTCODE)
1973  av_log(avctx, AV_LOG_DEBUG, "startcode: %X\n", start_code);
1974 
1975  /* process markers */
1976  if (start_code >= 0xd0 && start_code <= 0xd7)
1977  av_log(avctx, AV_LOG_DEBUG,
1978  "restart marker: %d\n", start_code & 0x0f);
1979  /* APP fields */
1980  else if (start_code >= APP0 && start_code <= APP15)
1981  mjpeg_decode_app(s);
1982  /* Comment */
1983  else if (start_code == COM)
1984  mjpeg_decode_com(s);
1985 
1986  ret = -1;
1987 
1988  if (!CONFIG_JPEGLS_DECODER &&
1989  (start_code == SOF48 || start_code == LSE)) {
1990  av_log(avctx, AV_LOG_ERROR, "JPEG-LS support not enabled.\n");
1991  return AVERROR(ENOSYS);
1992  }
1993 
1994  switch (start_code) {
1995  case SOI:
1996  s->restart_interval = 0;
1997  s->restart_count = 0;
1998  /* nothing to do on SOI */
1999  break;
2000  case DQT:
2001  ff_mjpeg_decode_dqt(s);
2002  break;
2003  case DHT:
2004  if ((ret = ff_mjpeg_decode_dht(s)) < 0) {
2005  av_log(avctx, AV_LOG_ERROR, "huffman table decode error\n");
2006  goto fail;
2007  }
2008  break;
2009  case SOF0:
2010  case SOF1:
2011  s->lossless = 0;
2012  s->ls = 0;
2013  s->progressive = 0;
2014  if ((ret = ff_mjpeg_decode_sof(s)) < 0)
2015  goto fail;
2016  break;
2017  case SOF2:
2018  s->lossless = 0;
2019  s->ls = 0;
2020  s->progressive = 1;
2021  if ((ret = ff_mjpeg_decode_sof(s)) < 0)
2022  goto fail;
2023  break;
2024  case SOF3:
2025  s->lossless = 1;
2026  s->ls = 0;
2027  s->progressive = 0;
2028  if ((ret = ff_mjpeg_decode_sof(s)) < 0)
2029  goto fail;
2030  break;
2031  case SOF48:
2032  s->lossless = 1;
2033  s->ls = 1;
2034  s->progressive = 0;
2035  if ((ret = ff_mjpeg_decode_sof(s)) < 0)
2036  goto fail;
2037  break;
2038  case LSE:
2039  if (!CONFIG_JPEGLS_DECODER ||
2040  (ret = ff_jpegls_decode_lse(s)) < 0)
2041  goto fail;
2042  break;
2043  case EOI:
2044 eoi_parser:
2045  s->cur_scan = 0;
2046  if (!s->got_picture) {
2047  av_log(avctx, AV_LOG_WARNING,
2048  "Found EOI before any SOF, ignoring\n");
2049  break;
2050  }
2051  if (s->interlaced) {
2052  s->bottom_field ^= 1;
2053  /* if not bottom field, do not output image yet */
2054  if (s->bottom_field == !s->interlace_polarity)
2055  break;
2056  }
2057  if ((ret = av_frame_ref(frame, s->picture_ptr)) < 0)
2058  return ret;
2059  *got_frame = 1;
2060  s->got_picture = 0;
2061 
2062  if (!s->lossless) {
2063  int qp = FFMAX3(s->qscale[0],
2064  s->qscale[1],
2065  s->qscale[2]);
2066  int qpw = (s->width + 15) / 16;
2067  AVBufferRef *qp_table_buf = av_buffer_alloc(qpw);
2068  if (qp_table_buf) {
2069  memset(qp_table_buf->data, qp, qpw);
2070  av_frame_set_qp_table(data, qp_table_buf, 0, FF_QSCALE_TYPE_MPEG1);
2071  }
2072 
2073  if(avctx->debug & FF_DEBUG_QP)
2074  av_log(avctx, AV_LOG_DEBUG, "QP: %d\n", qp);
2075  }
2076 
2077  goto the_end;
2078  case SOS:
2079  s->cur_scan++;
2080  if ((ret = ff_mjpeg_decode_sos(s, NULL, 0, NULL)) < 0 &&
2081  (avctx->err_recognition & AV_EF_EXPLODE))
2082  goto fail;
2083  break;
2084  case DRI:
2085  mjpeg_decode_dri(s);
2086  break;
2087  case SOF5:
2088  case SOF6:
2089  case SOF7:
2090  case SOF9:
2091  case SOF10:
2092  case SOF11:
2093  case SOF13:
2094  case SOF14:
2095  case SOF15:
2096  case JPG:
2097  av_log(avctx, AV_LOG_ERROR,
2098  "mjpeg: unsupported coding type (%x)\n", start_code);
2099  break;
2100  }
2101 
2102  /* eof process start code */
2103  buf_ptr += (get_bits_count(&s->gb) + 7) / 8;
2104  av_log(avctx, AV_LOG_DEBUG,
2105  "marker parser used %d bytes (%d bits)\n",
2106  (get_bits_count(&s->gb) + 7) / 8, get_bits_count(&s->gb));
2107  }
2108  if (s->got_picture && s->cur_scan) {
2109  av_log(avctx, AV_LOG_WARNING, "EOI missing, emulating\n");
2110  goto eoi_parser;
2111  }
2112  av_log(avctx, AV_LOG_FATAL, "No JPEG data found in image\n");
2113  return AVERROR_INVALIDDATA;
2114 fail:
2115  s->got_picture = 0;
2116  return ret;
2117 the_end:
2118 
2119  is16bit = av_pix_fmt_desc_get(s->avctx->pix_fmt)->comp[0].step_minus1;
2120 
2121  if (s->upscale_h) {
2122  int p;
2123  av_assert0(avctx->pix_fmt == AV_PIX_FMT_YUVJ444P ||
2124  avctx->pix_fmt == AV_PIX_FMT_YUV444P ||
2125  avctx->pix_fmt == AV_PIX_FMT_YUVJ440P ||
2126  avctx->pix_fmt == AV_PIX_FMT_YUV440P ||
2127  avctx->pix_fmt == AV_PIX_FMT_YUVA444P ||
2128  avctx->pix_fmt == AV_PIX_FMT_YUVJ420P ||
2129  avctx->pix_fmt == AV_PIX_FMT_YUV420P ||
2130  avctx->pix_fmt == AV_PIX_FMT_YUV420P16||
2131  avctx->pix_fmt == AV_PIX_FMT_YUVA420P ||
2132  avctx->pix_fmt == AV_PIX_FMT_YUVA420P16||
2133  avctx->pix_fmt == AV_PIX_FMT_GBRP ||
2134  avctx->pix_fmt == AV_PIX_FMT_GBRAP
2135  );
2136  avcodec_get_chroma_sub_sample(s->avctx->pix_fmt, &hshift, &vshift);
2137  for (p = 0; p<4; p++) {
2138  uint8_t *line = s->picture_ptr->data[p];
2139  int w = s->width;
2140  int h = s->height;
2141  if (!(s->upscale_h & (1<<p)))
2142  continue;
2143  if (p==1 || p==2) {
2144  w = FF_CEIL_RSHIFT(w, hshift);
2145  h = FF_CEIL_RSHIFT(h, vshift);
2146  }
2147  if (s->upscale_v & (1<<p))
2148  h = (h+1)>>1;
2149  av_assert0(w > 0);
2150  for (i = 0; i < h; i++) {
2151  if (is16bit) ((uint16_t*)line)[w - 1] = ((uint16_t*)line)[(w - 1) / 2];
2152  else line[w - 1] = line[(w - 1) / 2];
2153  for (index = w - 2; index > 0; index--) {
2154  if (is16bit)
2155  ((uint16_t*)line)[index] = (((uint16_t*)line)[index / 2] + ((uint16_t*)line)[(index + 1) / 2]) >> 1;
2156  else
2157  line[index] = (line[index / 2] + line[(index + 1) / 2]) >> 1;
2158  }
2159  line += s->linesize[p];
2160  }
2161  }
2162  }
2163  if (s->upscale_v) {
2164  int p;
2165  av_assert0(avctx->pix_fmt == AV_PIX_FMT_YUVJ444P ||
2166  avctx->pix_fmt == AV_PIX_FMT_YUV444P ||
2167  avctx->pix_fmt == AV_PIX_FMT_YUVJ422P ||
2168  avctx->pix_fmt == AV_PIX_FMT_YUV422P ||
2169  avctx->pix_fmt == AV_PIX_FMT_YUVJ420P ||
2170  avctx->pix_fmt == AV_PIX_FMT_YUV420P ||
2171  avctx->pix_fmt == AV_PIX_FMT_YUV440P ||
2172  avctx->pix_fmt == AV_PIX_FMT_YUVJ440P ||
2173  avctx->pix_fmt == AV_PIX_FMT_YUVA444P ||
2174  avctx->pix_fmt == AV_PIX_FMT_YUVA420P ||
2175  avctx->pix_fmt == AV_PIX_FMT_YUVA420P16||
2176  avctx->pix_fmt == AV_PIX_FMT_GBRP ||
2177  avctx->pix_fmt == AV_PIX_FMT_GBRAP
2178  );
2179  avcodec_get_chroma_sub_sample(s->avctx->pix_fmt, &hshift, &vshift);
2180  for (p = 0; p < 4; p++) {
2181  uint8_t *dst;
2182  int w = s->width;
2183  int h = s->height;
2184  if (!(s->upscale_v & (1<<p)))
2185  continue;
2186  if (p==1 || p==2) {
2187  w = FF_CEIL_RSHIFT(w, hshift);
2188  h = FF_CEIL_RSHIFT(h, vshift);
2189  }
2190  dst = &((uint8_t *)s->picture_ptr->data[p])[(h - 1) * s->linesize[p]];
2191  for (i = h - 1; i; i--) {
2192  uint8_t *src1 = &((uint8_t *)s->picture_ptr->data[p])[i / 2 * s->linesize[p]];
2193  uint8_t *src2 = &((uint8_t *)s->picture_ptr->data[p])[(i + 1) / 2 * s->linesize[p]];
2194  if (src1 == src2 || i == h - 1) {
2195  memcpy(dst, src1, w);
2196  } else {
2197  for (index = 0; index < w; index++)
2198  dst[index] = (src1[index] + src2[index]) >> 1;
2199  }
2200  dst -= s->linesize[p];
2201  }
2202  }
2203  }
2204  if (s->flipped) {
2205  int j;
2206  avcodec_get_chroma_sub_sample(s->avctx->pix_fmt, &hshift, &vshift);
2207  for (index=0; index<4; index++) {
2208  uint8_t *dst = s->picture_ptr->data[index];
2209  int w = s->picture_ptr->width;
2210  int h = s->picture_ptr->height;
2211  if(index && index<3){
2212  w = FF_CEIL_RSHIFT(w, hshift);
2213  h = FF_CEIL_RSHIFT(h, vshift);
2214  }
2215  if(dst){
2216  uint8_t *dst2 = dst + s->picture_ptr->linesize[index]*(h-1);
2217  for (i=0; i<h/2; i++) {
2218  for (j=0; j<w; j++)
2219  FFSWAP(int, dst[j], dst2[j]);
2220  dst += s->picture_ptr->linesize[index];
2221  dst2 -= s->picture_ptr->linesize[index];
2222  }
2223  }
2224  }
2225  }
2226  if (s->adobe_transform == 0 && s->avctx->pix_fmt == AV_PIX_FMT_GBRAP) {
2227  int w = s->picture_ptr->width;
2228  int h = s->picture_ptr->height;
2229  for (i=0; i<h; i++) {
2230  int j;
2231  uint8_t *dst[4];
2232  for (index=0; index<4; index++) {
2233  dst[index] = s->picture_ptr->data[index]
2234  + s->picture_ptr->linesize[index]*i;
2235  }
2236  for (j=0; j<w; j++) {
2237  int k = dst[3][j];
2238  int r = dst[0][j] * k;
2239  int g = dst[1][j] * k;
2240  int b = dst[2][j] * k;
2241  dst[0][j] = g*257 >> 16;
2242  dst[1][j] = b*257 >> 16;
2243  dst[2][j] = r*257 >> 16;
2244  dst[3][j] = 255;
2245  }
2246  }
2247  }
2248  if (s->adobe_transform == 2 && s->avctx->pix_fmt == AV_PIX_FMT_YUVA444P) {
2249  int w = s->picture_ptr->width;
2250  int h = s->picture_ptr->height;
2251  for (i=0; i<h; i++) {
2252  int j;
2253  uint8_t *dst[4];
2254  for (index=0; index<4; index++) {
2255  dst[index] = s->picture_ptr->data[index]
2256  + s->picture_ptr->linesize[index]*i;
2257  }
2258  for (j=0; j<w; j++) {
2259  int k = dst[3][j];
2260  int r = (255 - dst[0][j]) * k;
2261  int g = (128 - dst[1][j]) * k;
2262  int b = (128 - dst[2][j]) * k;
2263  dst[0][j] = r*257 >> 16;
2264  dst[1][j] = (g*257 >> 16) + 128;
2265  dst[2][j] = (b*257 >> 16) + 128;
2266  dst[3][j] = 255;
2267  }
2268  }
2269  }
2270 
2271  if (s->stereo3d) {
2272  AVStereo3D *stereo = av_stereo3d_create_side_data(data);
2273  if (stereo) {
2274  stereo->type = s->stereo3d->type;
2275  stereo->flags = s->stereo3d->flags;
2276  }
2277  av_freep(&s->stereo3d);
2278  }
2279 
2280  av_dict_copy(avpriv_frame_get_metadatap(data), s->exif_metadata, 0);
2281  av_dict_free(&s->exif_metadata);
2282 
2283  av_log(avctx, AV_LOG_DEBUG, "decode frame unused %"PTRDIFF_SPECIFIER" bytes\n",
2284  buf_end - buf_ptr);
2285 // return buf_end - buf_ptr;
2286  return buf_ptr - buf;
2287 }
2288 
2289 av_cold int ff_mjpeg_decode_end(AVCodecContext *avctx)
2290 {
2291  MJpegDecodeContext *s = avctx->priv_data;
2292  int i, j;
2293 
2294  if (s->interlaced && s->bottom_field == !s->interlace_polarity && s->got_picture && !avctx->frame_number) {
2295  av_log(avctx, AV_LOG_INFO, "Single field\n");
2296  }
2297 
2298  if (s->picture) {
2299  av_frame_free(&s->picture);
2300  s->picture_ptr = NULL;
2301  } else if (s->picture_ptr)
2302  av_frame_unref(s->picture_ptr);
2303 
2304  av_freep(&s->buffer);
2305  av_freep(&s->stereo3d);
2306  av_freep(&s->ljpeg_buffer);
2307  s->ljpeg_buffer_size = 0;
2308 
2309  for (i = 0; i < 3; i++) {
2310  for (j = 0; j < 4; j++)
2311  ff_free_vlc(&s->vlcs[i][j]);
2312  }
2313  for (i = 0; i < MAX_COMPONENTS; i++) {
2314  av_freep(&s->blocks[i]);
2315  av_freep(&s->last_nnz[i]);
2316  }
2317  av_dict_free(&s->exif_metadata);
2318  return 0;
2319 }
2320 
2321 static void decode_flush(AVCodecContext *avctx)
2322 {
2323  MJpegDecodeContext *s = avctx->priv_data;
2324  s->got_picture = 0;
2325 }
2326 
2327 #if CONFIG_MJPEG_DECODER
2328 #define OFFSET(x) offsetof(MJpegDecodeContext, x)
2329 #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
2330 static const AVOption options[] = {
2331  { "extern_huff", "Use external huffman table.",
2332  OFFSET(extern_huff), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VD },
2333  { NULL },
2334 };
2335 
2336 static const AVClass mjpegdec_class = {
2337  .class_name = "MJPEG decoder",
2338  .item_name = av_default_item_name,
2339  .option = options,
2340  .version = LIBAVUTIL_VERSION_INT,
2341 };
2342 
2343 AVCodec ff_mjpeg_decoder = {
2344  .name = "mjpeg",
2345  .long_name = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),
2346  .type = AVMEDIA_TYPE_VIDEO,
2347  .id = AV_CODEC_ID_MJPEG,
2348  .priv_data_size = sizeof(MJpegDecodeContext),
2349  .init = ff_mjpeg_decode_init,
2350  .close = ff_mjpeg_decode_end,
2351  .decode = ff_mjpeg_decode_frame,
2352  .flush = decode_flush,
2353  .capabilities = CODEC_CAP_DR1,
2354  .max_lowres = 3,
2355  .priv_class = &mjpegdec_class,
2356 };
2357 #endif
2358 #if CONFIG_THP_DECODER
2359 AVCodec ff_thp_decoder = {
2360  .name = "thp",
2361  .long_name = NULL_IF_CONFIG_SMALL("Nintendo Gamecube THP video"),
2362  .type = AVMEDIA_TYPE_VIDEO,
2363  .id = AV_CODEC_ID_THP,
2364  .priv_data_size = sizeof(MJpegDecodeContext),
2365  .init = ff_mjpeg_decode_init,
2366  .close = ff_mjpeg_decode_end,
2367  .decode = ff_mjpeg_decode_frame,
2368  .flush = decode_flush,
2369  .capabilities = CODEC_CAP_DR1,
2370  .max_lowres = 3,
2371 };
2372 #endif
Generated on Fri Dec 5 2014 04:41:58 for FFmpeg by   doxygen 1.8.2