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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] = { 0 };
250  int v_count[MAX_COMPONENTS] = { 0 };
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  for (i = 0; i < nb_components; i++) {
310  /* component id */
311  s->component_id[i] = get_bits(&s->gb, 8) - 1;
312  h_count[i] = get_bits(&s->gb, 4);
313  v_count[i] = get_bits(&s->gb, 4);
314  /* compute hmax and vmax (only used in interleaved case) */
315  if (h_count[i] > s->h_max)
316  s->h_max = h_count[i];
317  if (v_count[i] > s->v_max)
318  s->v_max = v_count[i];
319  s->quant_index[i] = get_bits(&s->gb, 8);
320  if (s->quant_index[i] >= 4) {
321  av_log(s->avctx, AV_LOG_ERROR, "quant_index is invalid\n");
322  return AVERROR_INVALIDDATA;
323  }
324  if (!h_count[i] || !v_count[i]) {
325  av_log(s->avctx, AV_LOG_ERROR,
326  "Invalid sampling factor in component %d %d:%d\n",
327  i, h_count[i], v_count[i]);
328  return AVERROR_INVALIDDATA;
329  }
330 
331  av_log(s->avctx, AV_LOG_DEBUG, "component %d %d:%d id: %d quant:%d\n",
332  i, h_count[i], v_count[i],
333  s->component_id[i], s->quant_index[i]);
334  }
335 
336  if (s->ls && (s->h_max > 1 || s->v_max > 1)) {
337  avpriv_report_missing_feature(s->avctx, "Subsampling in JPEG-LS");
338  return AVERROR_PATCHWELCOME;
339  }
340 
341 
342  /* if different size, realloc/alloc picture */
343  if (width != s->width || height != s->height || bits != s->bits ||
344  memcmp(s->h_count, h_count, sizeof(h_count)) ||
345  memcmp(s->v_count, v_count, sizeof(v_count))) {
346 
347  s->width = width;
348  s->height = height;
349  s->bits = bits;
350  memcpy(s->h_count, h_count, sizeof(h_count));
351  memcpy(s->v_count, v_count, sizeof(v_count));
352  s->interlaced = 0;
353  s->got_picture = 0;
354 
355  /* test interlaced mode */
356  if (s->first_picture &&
357  s->org_height != 0 &&
358  s->height < ((s->org_height * 3) / 4)) {
359  s->interlaced = 1;
360  s->bottom_field = s->interlace_polarity;
361  s->picture_ptr->interlaced_frame = 1;
362  s->picture_ptr->top_field_first = !s->interlace_polarity;
363  height *= 2;
364  }
365 
366  ret = ff_set_dimensions(s->avctx, width, height);
367  if (ret < 0)
368  return ret;
369 
370  s->first_picture = 0;
371  }
372 
373  if (s->got_picture && s->interlaced && (s->bottom_field == !s->interlace_polarity)) {
374  if (s->progressive) {
375  avpriv_request_sample(s->avctx, "progressively coded interlaced picture");
376  return AVERROR_INVALIDDATA;
377  }
378  } else{
379  if (s->v_max == 1 && s->h_max == 1 && s->lossless==1 && (nb_components==3 || nb_components==4))
380  s->rgb = 1;
381  else if (!s->lossless)
382  s->rgb = 0;
383  /* XXX: not complete test ! */
384  pix_fmt_id = ((unsigned)s->h_count[0] << 28) | (s->v_count[0] << 24) |
385  (s->h_count[1] << 20) | (s->v_count[1] << 16) |
386  (s->h_count[2] << 12) | (s->v_count[2] << 8) |
387  (s->h_count[3] << 4) | s->v_count[3];
388  av_log(s->avctx, AV_LOG_DEBUG, "pix fmt id %x\n", pix_fmt_id);
389  /* NOTE we do not allocate pictures large enough for the possible
390  * padding of h/v_count being 4 */
391  if (!(pix_fmt_id & 0xD0D0D0D0))
392  pix_fmt_id -= (pix_fmt_id & 0xF0F0F0F0) >> 1;
393  if (!(pix_fmt_id & 0x0D0D0D0D))
394  pix_fmt_id -= (pix_fmt_id & 0x0F0F0F0F) >> 1;
395 
396  for (i = 0; i < 8; i++) {
397  int j = 6 + (i&1) - (i&6);
398  int is = (pix_fmt_id >> (4*i)) & 0xF;
399  int js = (pix_fmt_id >> (4*j)) & 0xF;
400 
401  if (is == 1 && js != 2 && (i < 2 || i > 5))
402  js = (pix_fmt_id >> ( 8 + 4*(i&1))) & 0xF;
403  if (is == 1 && js != 2 && (i < 2 || i > 5))
404  js = (pix_fmt_id >> (16 + 4*(i&1))) & 0xF;
405 
406  if (is == 1 && js == 2) {
407  if (i & 1) s->upscale_h |= 1 << (j/2);
408  else s->upscale_v |= 1 << (j/2);
409  }
410  }
411 
412  switch (pix_fmt_id) {
413  case 0x11111100:
414  if (s->rgb)
415  s->avctx->pix_fmt = s->bits <= 9 ? AV_PIX_FMT_BGR24 : AV_PIX_FMT_BGR48;
416  else {
417  if (s->component_id[0] == 'Q' && s->component_id[1] == 'F' && s->component_id[2] == 'A') {
418  s->avctx->pix_fmt = s->bits <= 8 ? AV_PIX_FMT_GBRP : AV_PIX_FMT_GBRP16;
419  } else {
420  if (s->bits <= 8) s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV444P : AV_PIX_FMT_YUVJ444P;
421  else s->avctx->pix_fmt = AV_PIX_FMT_YUV444P16;
422  s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
423  }
424  }
425  av_assert0(s->nb_components == 3);
426  break;
427  case 0x11111111:
428  if (s->rgb)
429  s->avctx->pix_fmt = s->bits <= 9 ? AV_PIX_FMT_ABGR : AV_PIX_FMT_RGBA64;
430  else {
431  if (s->adobe_transform == 0 && s->bits <= 8) {
432  s->avctx->pix_fmt = AV_PIX_FMT_GBRAP;
433  } else {
434  s->avctx->pix_fmt = s->bits <= 8 ? AV_PIX_FMT_YUVA444P : AV_PIX_FMT_YUVA444P16;
435  s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
436  }
437  }
438  av_assert0(s->nb_components == 4);
439  break;
440  case 0x22111122:
441  case 0x22111111:
442  if (s->adobe_transform == 0 && s->bits <= 8) {
443  s->avctx->pix_fmt = AV_PIX_FMT_GBRAP;
444  s->upscale_v |= 6;
445  s->upscale_h |= 6;
446  } else if (s->adobe_transform == 2 && s->bits <= 8) {
447  s->avctx->pix_fmt = AV_PIX_FMT_YUVA444P;
448  s->upscale_v |= 6;
449  s->upscale_h |= 6;
450  s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
451  } else {
452  if (s->bits <= 8) s->avctx->pix_fmt = AV_PIX_FMT_YUVA420P;
453  else s->avctx->pix_fmt = AV_PIX_FMT_YUVA420P16;
454  s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
455  }
456  av_assert0(s->nb_components == 4);
457  break;
458  case 0x12121100:
459  case 0x22122100:
460  case 0x21211100:
461  case 0x22211200:
462  if (s->bits <= 8) s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV444P : AV_PIX_FMT_YUVJ444P;
463  else
464  goto unk_pixfmt;
465  s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
466  break;
467  case 0x22221100:
468  case 0x22112200:
469  case 0x11222200:
470  if (s->bits <= 8) s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV444P : AV_PIX_FMT_YUVJ444P;
471  else
472  goto unk_pixfmt;
473  s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
474  break;
475  case 0x11000000:
476  case 0x13000000:
477  case 0x14000000:
478  case 0x31000000:
479  case 0x33000000:
480  case 0x34000000:
481  case 0x41000000:
482  case 0x43000000:
483  case 0x44000000:
484  if(s->bits <= 8)
485  s->avctx->pix_fmt = AV_PIX_FMT_GRAY8;
486  else
487  s->avctx->pix_fmt = AV_PIX_FMT_GRAY16;
488  break;
489  case 0x12111100:
490  case 0x14121200:
491  case 0x14111100:
492  case 0x22211100:
493  case 0x22112100:
494  if (s->component_id[0] == 'Q' && s->component_id[1] == 'F' && s->component_id[2] == 'A') {
495  if (s->bits <= 8) s->avctx->pix_fmt = AV_PIX_FMT_GBRP;
496  else
497  goto unk_pixfmt;
498  s->upscale_v |= 3;
499  } else {
500  if (pix_fmt_id == 0x14111100)
501  s->upscale_v |= 6;
502  if (s->bits <= 8) s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV440P : AV_PIX_FMT_YUVJ440P;
503  else
504  goto unk_pixfmt;
505  s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
506  }
507  break;
508  case 0x21111100:
509  if (s->component_id[0] == 'Q' && s->component_id[1] == 'F' && s->component_id[2] == 'A') {
510  if (s->bits <= 8) s->avctx->pix_fmt = AV_PIX_FMT_GBRP;
511  else
512  goto unk_pixfmt;
513  s->upscale_h |= 3;
514  } else {
515  if (s->bits <= 8) s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV422P : AV_PIX_FMT_YUVJ422P;
516  else s->avctx->pix_fmt = AV_PIX_FMT_YUV422P16;
517  s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
518  }
519  break;
520  case 0x22121100:
521  case 0x22111200:
522  if (s->bits <= 8) s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV422P : AV_PIX_FMT_YUVJ422P;
523  else
524  goto unk_pixfmt;
525  s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
526  break;
527  case 0x22111100:
528  case 0x42111100:
529  case 0x24111100:
530  if (s->bits <= 8) s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV420P : AV_PIX_FMT_YUVJ420P;
531  else s->avctx->pix_fmt = AV_PIX_FMT_YUV420P16;
532  s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
533  if (pix_fmt_id == 0x42111100) {
534  if (s->bits > 8)
535  goto unk_pixfmt;
536  s->upscale_h = 6;
537  } else if (pix_fmt_id == 0x24111100) {
538  if (s->bits > 8)
539  goto unk_pixfmt;
540  s->upscale_v = 6;
541  }
542  break;
543  case 0x41111100:
544  if (s->bits <= 8) s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV411P : AV_PIX_FMT_YUVJ411P;
545  else
546  goto unk_pixfmt;
547  s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
548  break;
549  default:
550 unk_pixfmt:
551  av_log(s->avctx, AV_LOG_ERROR, "Unhandled pixel format 0x%x bits:%d\n", pix_fmt_id, s->bits);
552  s->upscale_h = s->upscale_v = 0;
553  return AVERROR_PATCHWELCOME;
554  }
555  if ((s->upscale_h || s->upscale_v) && s->avctx->lowres) {
556  av_log(s->avctx, AV_LOG_ERROR, "lowres not supported for weird subsampling\n");
557  return AVERROR_PATCHWELCOME;
558  }
559  if (s->ls) {
560  s->upscale_h = s->upscale_v = 0;
561  if (s->nb_components == 3) {
562  s->avctx->pix_fmt = AV_PIX_FMT_RGB24;
563  } else if (s->nb_components != 1) {
564  av_log(s->avctx, AV_LOG_ERROR, "Unsupported number of components %d\n", s->nb_components);
565  return AVERROR_PATCHWELCOME;
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  if ( 8*(h * mb_x + x) < s->width
1252  && 8*(v * mb_y + y) < s->height) {
1253  ptr = data[c] + block_offset;
1254  } else
1255  ptr = NULL;
1256  if (!s->progressive) {
1257  if (copy_mb) {
1258  if (ptr)
1259  mjpeg_copy_block(s, ptr, reference_data[c] + block_offset,
1260  linesize[c], s->avctx->lowres);
1261 
1262  } else {
1263  s->bdsp.clear_block(s->block);
1264  if (decode_block(s, s->block, i,
1265  s->dc_index[i], s->ac_index[i],
1266  s->quant_matrixes[s->quant_sindex[i]]) < 0) {
1267  av_log(s->avctx, AV_LOG_ERROR,
1268  "error y=%d x=%d\n", mb_y, mb_x);
1269  return AVERROR_INVALIDDATA;
1270  }
1271  if (ptr) {
1272  s->idsp.idct_put(ptr, linesize[c], s->block);
1273  if (s->bits & 7)
1274  shift_output(s, ptr, linesize[c]);
1275  }
1276  }
1277  } else {
1278  int block_idx = s->block_stride[c] * (v * mb_y + y) +
1279  (h * mb_x + x);
1280  int16_t *block = s->blocks[c][block_idx];
1281  if (Ah)
1282  block[0] += get_bits1(&s->gb) *
1283  s->quant_matrixes[s->quant_sindex[i]][0] << Al;
1284  else if (decode_dc_progressive(s, block, i, s->dc_index[i],
1285  s->quant_matrixes[s->quant_sindex[i]],
1286  Al) < 0) {
1287  av_log(s->avctx, AV_LOG_ERROR,
1288  "error y=%d x=%d\n", mb_y, mb_x);
1289  return AVERROR_INVALIDDATA;
1290  }
1291  }
1292  av_dlog(s->avctx, "mb: %d %d processed\n", mb_y, mb_x);
1293  av_dlog(s->avctx, "%d %d %d %d %d %d %d %d \n",
1294  mb_x, mb_y, x, y, c, s->bottom_field,
1295  (v * mb_y + y) * 8, (h * mb_x + x) * 8);
1296  if (++x == h) {
1297  x = 0;
1298  y++;
1299  }
1300  }
1301  }
1302 
1303  handle_rstn(s, nb_components);
1304  }
1305  }
1306  return 0;
1307 }
1308 
1309 static int mjpeg_decode_scan_progressive_ac(MJpegDecodeContext *s, int ss,
1310  int se, int Ah, int Al)
1311 {
1312  int mb_x, mb_y;
1313  int EOBRUN = 0;
1314  int c = s->comp_index[0];
1315  uint8_t *data = s->picture_ptr->data[c];
1316  int linesize = s->linesize[c];
1317  int last_scan = 0;
1318  int16_t *quant_matrix = s->quant_matrixes[s->quant_sindex[0]];
1319  int bytes_per_pixel = 1 + (s->bits > 8);
1320 
1321  av_assert0(ss>=0 && Ah>=0 && Al>=0);
1322  if (se < ss || se > 63) {
1323  av_log(s->avctx, AV_LOG_ERROR, "SS/SE %d/%d is invalid\n", ss, se);
1324  return AVERROR_INVALIDDATA;
1325  }
1326 
1327  if (!Al) {
1328  // s->coefs_finished is a bitmask for coefficients coded
1329  // ss and se are parameters telling start and end coefficients
1330  s->coefs_finished[c] |= (2ULL << se) - (1ULL << ss);
1331  last_scan = !~s->coefs_finished[c];
1332  }
1333 
1334  if (s->interlaced && s->bottom_field)
1335  data += linesize >> 1;
1336 
1337  s->restart_count = 0;
1338 
1339  for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
1340  uint8_t *ptr = data + (mb_y * linesize * 8 >> s->avctx->lowres);
1341  int block_idx = mb_y * s->block_stride[c];
1342  int16_t (*block)[64] = &s->blocks[c][block_idx];
1343  uint8_t *last_nnz = &s->last_nnz[c][block_idx];
1344  for (mb_x = 0; mb_x < s->mb_width; mb_x++, block++, last_nnz++) {
1345  int ret;
1346  if (s->restart_interval && !s->restart_count)
1347  s->restart_count = s->restart_interval;
1348 
1349  if (Ah)
1350  ret = decode_block_refinement(s, *block, last_nnz, s->ac_index[0],
1351  quant_matrix, ss, se, Al, &EOBRUN);
1352  else
1353  ret = decode_block_progressive(s, *block, last_nnz, s->ac_index[0],
1354  quant_matrix, ss, se, Al, &EOBRUN);
1355  if (ret < 0) {
1356  av_log(s->avctx, AV_LOG_ERROR,
1357  "error y=%d x=%d\n", mb_y, mb_x);
1358  return AVERROR_INVALIDDATA;
1359  }
1360 
1361  if (last_scan) {
1362  s->idsp.idct_put(ptr, linesize, *block);
1363  if (s->bits & 7)
1364  shift_output(s, ptr, linesize);
1365  ptr += bytes_per_pixel*8 >> s->avctx->lowres;
1366  }
1367  if (handle_rstn(s, 0))
1368  EOBRUN = 0;
1369  }
1370  }
1371  return 0;
1372 }
1373 
1374 int ff_mjpeg_decode_sos(MJpegDecodeContext *s, const uint8_t *mb_bitmask,
1375  int mb_bitmask_size, const AVFrame *reference)
1376 {
1377  int len, nb_components, i, h, v, predictor, point_transform;
1378  int index, id, ret;
1379  const int block_size = s->lossless ? 1 : 8;
1380  int ilv, prev_shift;
1381 
1382  if (!s->got_picture) {
1383  av_log(s->avctx, AV_LOG_WARNING,
1384  "Can not process SOS before SOF, skipping\n");
1385  return -1;
1386  }
1387 
1388  av_assert0(s->picture_ptr->data[0]);
1389  /* XXX: verify len field validity */
1390  len = get_bits(&s->gb, 16);
1391  nb_components = get_bits(&s->gb, 8);
1392  if (nb_components == 0 || nb_components > MAX_COMPONENTS) {
1393  av_log(s->avctx, AV_LOG_ERROR,
1394  "decode_sos: nb_components (%d) unsupported\n", nb_components);
1395  return AVERROR_PATCHWELCOME;
1396  }
1397  if (len != 6 + 2 * nb_components) {
1398  av_log(s->avctx, AV_LOG_ERROR, "decode_sos: invalid len (%d)\n", len);
1399  return AVERROR_INVALIDDATA;
1400  }
1401  for (i = 0; i < nb_components; i++) {
1402  id = get_bits(&s->gb, 8) - 1;
1403  av_log(s->avctx, AV_LOG_DEBUG, "component: %d\n", id);
1404  /* find component index */
1405  for (index = 0; index < s->nb_components; index++)
1406  if (id == s->component_id[index])
1407  break;
1408  if (index == s->nb_components) {
1409  av_log(s->avctx, AV_LOG_ERROR,
1410  "decode_sos: index(%d) out of components\n", index);
1411  return AVERROR_INVALIDDATA;
1412  }
1413  /* Metasoft MJPEG codec has Cb and Cr swapped */
1414  if (s->avctx->codec_tag == MKTAG('M', 'T', 'S', 'J')
1415  && nb_components == 3 && s->nb_components == 3 && i)
1416  index = 3 - i;
1417 
1418  s->quant_sindex[i] = s->quant_index[index];
1419  s->nb_blocks[i] = s->h_count[index] * s->v_count[index];
1420  s->h_scount[i] = s->h_count[index];
1421  s->v_scount[i] = s->v_count[index];
1422 
1423  if(nb_components == 3 && s->nb_components == 3 && s->avctx->pix_fmt == AV_PIX_FMT_GBR24P)
1424  index = (i+2)%3;
1425  if(nb_components == 1 && s->nb_components == 3 && s->avctx->pix_fmt == AV_PIX_FMT_GBR24P)
1426  index = (index+2)%3;
1427 
1428  s->comp_index[i] = index;
1429 
1430  s->dc_index[i] = get_bits(&s->gb, 4);
1431  s->ac_index[i] = get_bits(&s->gb, 4);
1432 
1433  if (s->dc_index[i] < 0 || s->ac_index[i] < 0 ||
1434  s->dc_index[i] >= 4 || s->ac_index[i] >= 4)
1435  goto out_of_range;
1436  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))
1437  goto out_of_range;
1438  }
1439 
1440  predictor = get_bits(&s->gb, 8); /* JPEG Ss / lossless JPEG predictor /JPEG-LS NEAR */
1441  ilv = get_bits(&s->gb, 8); /* JPEG Se / JPEG-LS ILV */
1442  if(s->avctx->codec_tag != AV_RL32("CJPG")){
1443  prev_shift = get_bits(&s->gb, 4); /* Ah */
1444  point_transform = get_bits(&s->gb, 4); /* Al */
1445  }else
1446  prev_shift = point_transform = 0;
1447 
1448  if (nb_components > 1) {
1449  /* interleaved stream */
1450  s->mb_width = (s->width + s->h_max * block_size - 1) / (s->h_max * block_size);
1451  s->mb_height = (s->height + s->v_max * block_size - 1) / (s->v_max * block_size);
1452  } else if (!s->ls) { /* skip this for JPEG-LS */
1453  h = s->h_max / s->h_scount[0];
1454  v = s->v_max / s->v_scount[0];
1455  s->mb_width = (s->width + h * block_size - 1) / (h * block_size);
1456  s->mb_height = (s->height + v * block_size - 1) / (v * block_size);
1457  s->nb_blocks[0] = 1;
1458  s->h_scount[0] = 1;
1459  s->v_scount[0] = 1;
1460  }
1461 
1462  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1463  av_log(s->avctx, AV_LOG_DEBUG, "%s %s p:%d >>:%d ilv:%d bits:%d skip:%d %s comp:%d\n",
1464  s->lossless ? "lossless" : "sequential DCT", s->rgb ? "RGB" : "",
1465  predictor, point_transform, ilv, s->bits, s->mjpb_skiptosod,
1466  s->pegasus_rct ? "PRCT" : (s->rct ? "RCT" : ""), nb_components);
1467 
1468 
1469  /* mjpeg-b can have padding bytes between sos and image data, skip them */
1470  for (i = s->mjpb_skiptosod; i > 0; i--)
1471  skip_bits(&s->gb, 8);
1472 
1473 next_field:
1474  for (i = 0; i < nb_components; i++)
1475  s->last_dc[i] = (4 << s->bits);
1476 
1477  if (s->lossless) {
1478  av_assert0(s->picture_ptr == s->picture);
1479  if (CONFIG_JPEGLS_DECODER && s->ls) {
1480 // for () {
1481 // reset_ls_coding_parameters(s, 0);
1482 
1483  if ((ret = ff_jpegls_decode_picture(s, predictor,
1484  point_transform, ilv)) < 0)
1485  return ret;
1486  } else {
1487  if (s->rgb) {
1488  if ((ret = ljpeg_decode_rgb_scan(s, nb_components, predictor, point_transform)) < 0)
1489  return ret;
1490  } else {
1491  if ((ret = ljpeg_decode_yuv_scan(s, predictor,
1492  point_transform,
1493  nb_components)) < 0)
1494  return ret;
1495  }
1496  }
1497  } else {
1498  if (s->progressive && predictor) {
1499  av_assert0(s->picture_ptr == s->picture);
1500  if ((ret = mjpeg_decode_scan_progressive_ac(s, predictor,
1501  ilv, prev_shift,
1502  point_transform)) < 0)
1503  return ret;
1504  } else {
1505  if ((ret = mjpeg_decode_scan(s, nb_components,
1506  prev_shift, point_transform,
1507  mb_bitmask, mb_bitmask_size, reference)) < 0)
1508  return ret;
1509  }
1510  }
1511 
1512  if (s->interlaced &&
1513  get_bits_left(&s->gb) > 32 &&
1514  show_bits(&s->gb, 8) == 0xFF) {
1515  GetBitContext bak = s->gb;
1516  align_get_bits(&bak);
1517  if (show_bits(&bak, 16) == 0xFFD1) {
1518  av_log(s->avctx, AV_LOG_DEBUG, "AVRn interlaced picture marker found\n");
1519  s->gb = bak;
1520  skip_bits(&s->gb, 16);
1521  s->bottom_field ^= 1;
1522 
1523  goto next_field;
1524  }
1525  }
1526 
1527  emms_c();
1528  return 0;
1529  out_of_range:
1530  av_log(s->avctx, AV_LOG_ERROR, "decode_sos: ac/dc index out of range\n");
1531  return AVERROR_INVALIDDATA;
1532 }
1533 
1534 static int mjpeg_decode_dri(MJpegDecodeContext *s)
1535 {
1536  if (get_bits(&s->gb, 16) != 4)
1537  return AVERROR_INVALIDDATA;
1538  s->restart_interval = get_bits(&s->gb, 16);
1539  s->restart_count = 0;
1540  av_log(s->avctx, AV_LOG_DEBUG, "restart interval: %d\n",
1541  s->restart_interval);
1542 
1543  return 0;
1544 }
1545 
1546 static int mjpeg_decode_app(MJpegDecodeContext *s)
1547 {
1548  int len, id, i;
1549 
1550  len = get_bits(&s->gb, 16);
1551  if (len < 6)
1552  return AVERROR_INVALIDDATA;
1553  if (8 * len > get_bits_left(&s->gb))
1554  return AVERROR_INVALIDDATA;
1555 
1556  id = get_bits_long(&s->gb, 32);
1557  len -= 6;
1558 
1559  if (s->avctx->debug & FF_DEBUG_STARTCODE) {
1560  char id_str[32];
1561  av_get_codec_tag_string(id_str, sizeof(id_str), av_bswap32(id));
1562  av_log(s->avctx, AV_LOG_DEBUG, "APPx (%s / %8X) len=%d\n", id_str, id, len);
1563  }
1564 
1565  /* Buggy AVID, it puts EOI only at every 10th frame. */
1566  /* Also, this fourcc is used by non-avid files too, it holds some
1567  information, but it's always present in AVID-created files. */
1568  if (id == AV_RB32("AVI1")) {
1569  /* structure:
1570  4bytes AVI1
1571  1bytes polarity
1572  1bytes always zero
1573  4bytes field_size
1574  4bytes field_size_less_padding
1575  */
1576  s->buggy_avid = 1;
1577  i = get_bits(&s->gb, 8); len--;
1578  av_log(s->avctx, AV_LOG_DEBUG, "polarity %d\n", i);
1579 #if 0
1580  skip_bits(&s->gb, 8);
1581  skip_bits(&s->gb, 32);
1582  skip_bits(&s->gb, 32);
1583  len -= 10;
1584 #endif
1585  goto out;
1586  }
1587 
1588 // len -= 2;
1589 
1590  if (id == AV_RB32("JFIF")) {
1591  int t_w, t_h, v1, v2;
1592  skip_bits(&s->gb, 8); /* the trailing zero-byte */
1593  v1 = get_bits(&s->gb, 8);
1594  v2 = get_bits(&s->gb, 8);
1595  skip_bits(&s->gb, 8);
1596 
1597  s->avctx->sample_aspect_ratio.num = get_bits(&s->gb, 16);
1598  s->avctx->sample_aspect_ratio.den = get_bits(&s->gb, 16);
1599  ff_set_sar(s->avctx, s->avctx->sample_aspect_ratio);
1600 
1601  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1602  av_log(s->avctx, AV_LOG_INFO,
1603  "mjpeg: JFIF header found (version: %x.%x) SAR=%d/%d\n",
1604  v1, v2,
1605  s->avctx->sample_aspect_ratio.num,
1606  s->avctx->sample_aspect_ratio.den);
1607 
1608  t_w = get_bits(&s->gb, 8);
1609  t_h = get_bits(&s->gb, 8);
1610  if (t_w && t_h) {
1611  /* skip thumbnail */
1612  if (len -10 - (t_w * t_h * 3) > 0)
1613  len -= t_w * t_h * 3;
1614  }
1615  len -= 10;
1616  goto out;
1617  }
1618 
1619  if (id == AV_RB32("Adob") && (get_bits(&s->gb, 8) == 'e')) {
1620  skip_bits(&s->gb, 16); /* version */
1621  skip_bits(&s->gb, 16); /* flags0 */
1622  skip_bits(&s->gb, 16); /* flags1 */
1623  s->adobe_transform = get_bits(&s->gb, 8);
1624  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1625  av_log(s->avctx, AV_LOG_INFO, "mjpeg: Adobe header found, transform=%d\n", s->adobe_transform);
1626  len -= 7;
1627  goto out;
1628  }
1629 
1630  if (id == AV_RB32("LJIF")) {
1631  int rgb = s->rgb;
1632  int pegasus_rct = s->pegasus_rct;
1633  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1634  av_log(s->avctx, AV_LOG_INFO,
1635  "Pegasus lossless jpeg header found\n");
1636  skip_bits(&s->gb, 16); /* version ? */
1637  skip_bits(&s->gb, 16); /* unknown always 0? */
1638  skip_bits(&s->gb, 16); /* unknown always 0? */
1639  skip_bits(&s->gb, 16); /* unknown always 0? */
1640  switch (i=get_bits(&s->gb, 8)) {
1641  case 1:
1642  rgb = 1;
1643  pegasus_rct = 0;
1644  break;
1645  case 2:
1646  rgb = 1;
1647  pegasus_rct = 1;
1648  break;
1649  default:
1650  av_log(s->avctx, AV_LOG_ERROR, "unknown colorspace %d\n", i);
1651  }
1652 
1653  len -= 9;
1654  if (s->got_picture)
1655  if (rgb != s->rgb || pegasus_rct != s->pegasus_rct) {
1656  av_log(s->avctx, AV_LOG_WARNING, "Mismatching LJIF tag\n");
1657  goto out;
1658  }
1659 
1660  s->rgb = rgb;
1661  s->pegasus_rct = pegasus_rct;
1662 
1663  goto out;
1664  }
1665  if (id == AV_RL32("colr") && len > 0) {
1666  s->colr = get_bits(&s->gb, 8);
1667  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1668  av_log(s->avctx, AV_LOG_INFO, "COLR %d\n", s->colr);
1669  len --;
1670  goto out;
1671  }
1672  if (id == AV_RL32("xfrm") && len > 0) {
1673  s->xfrm = get_bits(&s->gb, 8);
1674  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1675  av_log(s->avctx, AV_LOG_INFO, "XFRM %d\n", s->xfrm);
1676  len --;
1677  goto out;
1678  }
1679 
1680  /* JPS extension by VRex */
1681  if (s->start_code == APP3 && id == AV_RB32("_JPS") && len >= 10) {
1682  int flags, layout, type;
1683  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1684  av_log(s->avctx, AV_LOG_INFO, "_JPSJPS_\n");
1685 
1686  skip_bits(&s->gb, 32); len -= 4; /* JPS_ */
1687  skip_bits(&s->gb, 16); len -= 2; /* block length */
1688  skip_bits(&s->gb, 8); /* reserved */
1689  flags = get_bits(&s->gb, 8);
1690  layout = get_bits(&s->gb, 8);
1691  type = get_bits(&s->gb, 8);
1692  len -= 4;
1693 
1694  s->stereo3d = av_stereo3d_alloc();
1695  if (!s->stereo3d) {
1696  goto out;
1697  }
1698  if (type == 0) {
1699  s->stereo3d->type = AV_STEREO3D_2D;
1700  } else if (type == 1) {
1701  switch (layout) {
1702  case 0x01:
1703  s->stereo3d->type = AV_STEREO3D_LINES;
1704  break;
1705  case 0x02:
1706  s->stereo3d->type = AV_STEREO3D_SIDEBYSIDE;
1707  break;
1708  case 0x03:
1709  s->stereo3d->type = AV_STEREO3D_TOPBOTTOM;
1710  break;
1711  }
1712  if (!(flags & 0x04)) {
1713  s->stereo3d->flags = AV_STEREO3D_FLAG_INVERT;
1714  }
1715  }
1716  goto out;
1717  }
1718 
1719  /* EXIF metadata */
1720  if (s->start_code == APP1 && id == AV_RB32("Exif") && len >= 2) {
1721  GetByteContext gbytes;
1722  int ret, le, ifd_offset, bytes_read;
1723  const uint8_t *aligned;
1724 
1725  skip_bits(&s->gb, 16); // skip padding
1726  len -= 2;
1727 
1728  // init byte wise reading
1729  aligned = align_get_bits(&s->gb);
1730  bytestream2_init(&gbytes, aligned, len);
1731 
1732  // read TIFF header
1733  ret = ff_tdecode_header(&gbytes, &le, &ifd_offset);
1734  if (ret) {
1735  av_log(s->avctx, AV_LOG_ERROR, "mjpeg: invalid TIFF header in EXIF data\n");
1736  } else {
1737  bytestream2_seek(&gbytes, ifd_offset, SEEK_SET);
1738 
1739  // read 0th IFD and store the metadata
1740  // (return values > 0 indicate the presence of subimage metadata)
1741  ret = avpriv_exif_decode_ifd(s->avctx, &gbytes, le, 0, &s->exif_metadata);
1742  if (ret < 0) {
1743  av_log(s->avctx, AV_LOG_ERROR, "mjpeg: error decoding EXIF data\n");
1744  }
1745  }
1746 
1747  bytes_read = bytestream2_tell(&gbytes);
1748  skip_bits(&s->gb, bytes_read << 3);
1749  len -= bytes_read;
1750 
1751  goto out;
1752  }
1753 
1754  /* Apple MJPEG-A */
1755  if ((s->start_code == APP1) && (len > (0x28 - 8))) {
1756  id = get_bits_long(&s->gb, 32);
1757  len -= 4;
1758  /* Apple MJPEG-A */
1759  if (id == AV_RB32("mjpg")) {
1760 #if 0
1761  skip_bits(&s->gb, 32); /* field size */
1762  skip_bits(&s->gb, 32); /* pad field size */
1763  skip_bits(&s->gb, 32); /* next off */
1764  skip_bits(&s->gb, 32); /* quant off */
1765  skip_bits(&s->gb, 32); /* huff off */
1766  skip_bits(&s->gb, 32); /* image off */
1767  skip_bits(&s->gb, 32); /* scan off */
1768  skip_bits(&s->gb, 32); /* data off */
1769 #endif
1770  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1771  av_log(s->avctx, AV_LOG_INFO, "mjpeg: Apple MJPEG-A header found\n");
1772  }
1773  }
1774 
1775 out:
1776  /* slow but needed for extreme adobe jpegs */
1777  if (len < 0)
1778  av_log(s->avctx, AV_LOG_ERROR,
1779  "mjpeg: error, decode_app parser read over the end\n");
1780  while (--len > 0)
1781  skip_bits(&s->gb, 8);
1782 
1783  return 0;
1784 }
1785 
1786 static int mjpeg_decode_com(MJpegDecodeContext *s)
1787 {
1788  int len = get_bits(&s->gb, 16);
1789  if (len >= 2 && 8 * len - 16 <= get_bits_left(&s->gb)) {
1790  char *cbuf = av_malloc(len - 1);
1791  if (cbuf) {
1792  int i;
1793  for (i = 0; i < len - 2; i++)
1794  cbuf[i] = get_bits(&s->gb, 8);
1795  if (i > 0 && cbuf[i - 1] == '\n')
1796  cbuf[i - 1] = 0;
1797  else
1798  cbuf[i] = 0;
1799 
1800  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1801  av_log(s->avctx, AV_LOG_INFO, "comment: '%s'\n", cbuf);
1802 
1803  /* buggy avid, it puts EOI only at every 10th frame */
1804  if (!strncmp(cbuf, "AVID", 4)) {
1805  parse_avid(s, cbuf, len);
1806  } else if (!strcmp(cbuf, "CS=ITU601"))
1807  s->cs_itu601 = 1;
1808  else if ((!strncmp(cbuf, "Intel(R) JPEG Library, version 1", 32) && s->avctx->codec_tag) ||
1809  (!strncmp(cbuf, "Metasoft MJPEG Codec", 20)))
1810  s->flipped = 1;
1811 
1812  av_free(cbuf);
1813  }
1814  }
1815 
1816  return 0;
1817 }
1818 
1819 /* return the 8 bit start code value and update the search
1820  state. Return -1 if no start code found */
1821 static int find_marker(const uint8_t **pbuf_ptr, const uint8_t *buf_end)
1822 {
1823  const uint8_t *buf_ptr;
1824  unsigned int v, v2;
1825  int val;
1826  int skipped = 0;
1827 
1828  buf_ptr = *pbuf_ptr;
1829  while (buf_end - buf_ptr > 1) {
1830  v = *buf_ptr++;
1831  v2 = *buf_ptr;
1832  if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe) && buf_ptr < buf_end) {
1833  val = *buf_ptr++;
1834  goto found;
1835  }
1836  skipped++;
1837  }
1838  buf_ptr = buf_end;
1839  val = -1;
1840 found:
1841  av_dlog(NULL, "find_marker skipped %d bytes\n", skipped);
1842  *pbuf_ptr = buf_ptr;
1843  return val;
1844 }
1845 
1846 int ff_mjpeg_find_marker(MJpegDecodeContext *s,
1847  const uint8_t **buf_ptr, const uint8_t *buf_end,
1848  const uint8_t **unescaped_buf_ptr,
1849  int *unescaped_buf_size)
1850 {
1851  int start_code;
1852  start_code = find_marker(buf_ptr, buf_end);
1853 
1854  av_fast_padded_malloc(&s->buffer, &s->buffer_size, buf_end - *buf_ptr);
1855  if (!s->buffer)
1856  return AVERROR(ENOMEM);
1857 
1858  /* unescape buffer of SOS, use special treatment for JPEG-LS */
1859  if (start_code == SOS && !s->ls) {
1860  const uint8_t *src = *buf_ptr;
1861  uint8_t *dst = s->buffer;
1862 
1863  while (src < buf_end) {
1864  uint8_t x = *(src++);
1865 
1866  *(dst++) = x;
1867  if (s->avctx->codec_id != AV_CODEC_ID_THP) {
1868  if (x == 0xff) {
1869  while (src < buf_end && x == 0xff)
1870  x = *(src++);
1871 
1872  if (x >= 0xd0 && x <= 0xd7)
1873  *(dst++) = x;
1874  else if (x)
1875  break;
1876  }
1877  }
1878  }
1879  *unescaped_buf_ptr = s->buffer;
1880  *unescaped_buf_size = dst - s->buffer;
1881  memset(s->buffer + *unescaped_buf_size, 0,
1882  FF_INPUT_BUFFER_PADDING_SIZE);
1883 
1884  av_log(s->avctx, AV_LOG_DEBUG, "escaping removed %"PTRDIFF_SPECIFIER" bytes\n",
1885  (buf_end - *buf_ptr) - (dst - s->buffer));
1886  } else if (start_code == SOS && s->ls) {
1887  const uint8_t *src = *buf_ptr;
1888  uint8_t *dst = s->buffer;
1889  int bit_count = 0;
1890  int t = 0, b = 0;
1891  PutBitContext pb;
1892 
1893  /* find marker */
1894  while (src + t < buf_end) {
1895  uint8_t x = src[t++];
1896  if (x == 0xff) {
1897  while ((src + t < buf_end) && x == 0xff)
1898  x = src[t++];
1899  if (x & 0x80) {
1900  t -= FFMIN(2, t);
1901  break;
1902  }
1903  }
1904  }
1905  bit_count = t * 8;
1906  init_put_bits(&pb, dst, t);
1907 
1908  /* unescape bitstream */
1909  while (b < t) {
1910  uint8_t x = src[b++];
1911  put_bits(&pb, 8, x);
1912  if (x == 0xFF) {
1913  x = src[b++];
1914  if (x & 0x80) {
1915  av_log(s->avctx, AV_LOG_WARNING, "Invalid escape sequence\n");
1916  x &= 0x7f;
1917  }
1918  put_bits(&pb, 7, x);
1919  bit_count--;
1920  }
1921  }
1922  flush_put_bits(&pb);
1923 
1924  *unescaped_buf_ptr = dst;
1925  *unescaped_buf_size = (bit_count + 7) >> 3;
1926  memset(s->buffer + *unescaped_buf_size, 0,
1927  FF_INPUT_BUFFER_PADDING_SIZE);
1928  } else {
1929  *unescaped_buf_ptr = *buf_ptr;
1930  *unescaped_buf_size = buf_end - *buf_ptr;
1931  }
1932 
1933  return start_code;
1934 }
1935 
1936 int ff_mjpeg_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
1937  AVPacket *avpkt)
1938 {
1939  AVFrame *frame = data;
1940  const uint8_t *buf = avpkt->data;
1941  int buf_size = avpkt->size;
1942  MJpegDecodeContext *s = avctx->priv_data;
1943  const uint8_t *buf_end, *buf_ptr;
1944  const uint8_t *unescaped_buf_ptr;
1945  int hshift, vshift;
1946  int unescaped_buf_size;
1947  int start_code;
1948  int i, index;
1949  int ret = 0;
1950  int is16bit;
1951 
1952  av_dict_free(&s->exif_metadata);
1953  av_freep(&s->stereo3d);
1954  s->adobe_transform = -1;
1955 
1956  buf_ptr = buf;
1957  buf_end = buf + buf_size;
1958  while (buf_ptr < buf_end) {
1959  /* find start next marker */
1960  start_code = ff_mjpeg_find_marker(s, &buf_ptr, buf_end,
1961  &unescaped_buf_ptr,
1962  &unescaped_buf_size);
1963  /* EOF */
1964  if (start_code < 0) {
1965  break;
1966  } else if (unescaped_buf_size > INT_MAX / 8) {
1967  av_log(avctx, AV_LOG_ERROR,
1968  "MJPEG packet 0x%x too big (%d/%d), corrupt data?\n",
1969  start_code, unescaped_buf_size, buf_size);
1970  return AVERROR_INVALIDDATA;
1971  }
1972  av_log(avctx, AV_LOG_DEBUG, "marker=%x avail_size_in_buf=%"PTRDIFF_SPECIFIER"\n",
1973  start_code, buf_end - buf_ptr);
1974 
1975  ret = init_get_bits8(&s->gb, unescaped_buf_ptr, unescaped_buf_size);
1976 
1977  if (ret < 0) {
1978  av_log(avctx, AV_LOG_ERROR, "invalid buffer\n");
1979  goto fail;
1980  }
1981 
1982  s->start_code = start_code;
1983  if (s->avctx->debug & FF_DEBUG_STARTCODE)
1984  av_log(avctx, AV_LOG_DEBUG, "startcode: %X\n", start_code);
1985 
1986  /* process markers */
1987  if (start_code >= 0xd0 && start_code <= 0xd7)
1988  av_log(avctx, AV_LOG_DEBUG,
1989  "restart marker: %d\n", start_code & 0x0f);
1990  /* APP fields */
1991  else if (start_code >= APP0 && start_code <= APP15)
1992  mjpeg_decode_app(s);
1993  /* Comment */
1994  else if (start_code == COM)
1995  mjpeg_decode_com(s);
1996 
1997  ret = -1;
1998 
1999  if (!CONFIG_JPEGLS_DECODER &&
2000  (start_code == SOF48 || start_code == LSE)) {
2001  av_log(avctx, AV_LOG_ERROR, "JPEG-LS support not enabled.\n");
2002  return AVERROR(ENOSYS);
2003  }
2004 
2005  switch (start_code) {
2006  case SOI:
2007  s->restart_interval = 0;
2008  s->restart_count = 0;
2009  /* nothing to do on SOI */
2010  break;
2011  case DQT:
2012  ff_mjpeg_decode_dqt(s);
2013  break;
2014  case DHT:
2015  if ((ret = ff_mjpeg_decode_dht(s)) < 0) {
2016  av_log(avctx, AV_LOG_ERROR, "huffman table decode error\n");
2017  goto fail;
2018  }
2019  break;
2020  case SOF0:
2021  case SOF1:
2022  s->lossless = 0;
2023  s->ls = 0;
2024  s->progressive = 0;
2025  if ((ret = ff_mjpeg_decode_sof(s)) < 0)
2026  goto fail;
2027  break;
2028  case SOF2:
2029  s->lossless = 0;
2030  s->ls = 0;
2031  s->progressive = 1;
2032  if ((ret = ff_mjpeg_decode_sof(s)) < 0)
2033  goto fail;
2034  break;
2035  case SOF3:
2036  s->lossless = 1;
2037  s->ls = 0;
2038  s->progressive = 0;
2039  if ((ret = ff_mjpeg_decode_sof(s)) < 0)
2040  goto fail;
2041  break;
2042  case SOF48:
2043  s->lossless = 1;
2044  s->ls = 1;
2045  s->progressive = 0;
2046  if ((ret = ff_mjpeg_decode_sof(s)) < 0)
2047  goto fail;
2048  break;
2049  case LSE:
2050  if (!CONFIG_JPEGLS_DECODER ||
2051  (ret = ff_jpegls_decode_lse(s)) < 0)
2052  goto fail;
2053  break;
2054  case EOI:
2055 eoi_parser:
2056  s->cur_scan = 0;
2057  if (!s->got_picture) {
2058  av_log(avctx, AV_LOG_WARNING,
2059  "Found EOI before any SOF, ignoring\n");
2060  break;
2061  }
2062  if (s->interlaced) {
2063  s->bottom_field ^= 1;
2064  /* if not bottom field, do not output image yet */
2065  if (s->bottom_field == !s->interlace_polarity)
2066  break;
2067  }
2068  if ((ret = av_frame_ref(frame, s->picture_ptr)) < 0)
2069  return ret;
2070  *got_frame = 1;
2071  s->got_picture = 0;
2072 
2073  if (!s->lossless) {
2074  int qp = FFMAX3(s->qscale[0],
2075  s->qscale[1],
2076  s->qscale[2]);
2077  int qpw = (s->width + 15) / 16;
2078  AVBufferRef *qp_table_buf = av_buffer_alloc(qpw);
2079  if (qp_table_buf) {
2080  memset(qp_table_buf->data, qp, qpw);
2081  av_frame_set_qp_table(data, qp_table_buf, 0, FF_QSCALE_TYPE_MPEG1);
2082  }
2083 
2084  if(avctx->debug & FF_DEBUG_QP)
2085  av_log(avctx, AV_LOG_DEBUG, "QP: %d\n", qp);
2086  }
2087 
2088  goto the_end;
2089  case SOS:
2090  s->cur_scan++;
2091  if ((ret = ff_mjpeg_decode_sos(s, NULL, 0, NULL)) < 0 &&
2092  (avctx->err_recognition & AV_EF_EXPLODE))
2093  goto fail;
2094  break;
2095  case DRI:
2096  mjpeg_decode_dri(s);
2097  break;
2098  case SOF5:
2099  case SOF6:
2100  case SOF7:
2101  case SOF9:
2102  case SOF10:
2103  case SOF11:
2104  case SOF13:
2105  case SOF14:
2106  case SOF15:
2107  case JPG:
2108  av_log(avctx, AV_LOG_ERROR,
2109  "mjpeg: unsupported coding type (%x)\n", start_code);
2110  break;
2111  }
2112 
2113  /* eof process start code */
2114  buf_ptr += (get_bits_count(&s->gb) + 7) / 8;
2115  av_log(avctx, AV_LOG_DEBUG,
2116  "marker parser used %d bytes (%d bits)\n",
2117  (get_bits_count(&s->gb) + 7) / 8, get_bits_count(&s->gb));
2118  }
2119  if (s->got_picture && s->cur_scan) {
2120  av_log(avctx, AV_LOG_WARNING, "EOI missing, emulating\n");
2121  goto eoi_parser;
2122  }
2123  av_log(avctx, AV_LOG_FATAL, "No JPEG data found in image\n");
2124  return AVERROR_INVALIDDATA;
2125 fail:
2126  s->got_picture = 0;
2127  return ret;
2128 the_end:
2129 
2130  is16bit = av_pix_fmt_desc_get(s->avctx->pix_fmt)->comp[0].step_minus1;
2131 
2132  if (s->upscale_h) {
2133  int p;
2134  av_assert0(avctx->pix_fmt == AV_PIX_FMT_YUVJ444P ||
2135  avctx->pix_fmt == AV_PIX_FMT_YUV444P ||
2136  avctx->pix_fmt == AV_PIX_FMT_YUVJ440P ||
2137  avctx->pix_fmt == AV_PIX_FMT_YUV440P ||
2138  avctx->pix_fmt == AV_PIX_FMT_YUVA444P ||
2139  avctx->pix_fmt == AV_PIX_FMT_YUVJ420P ||
2140  avctx->pix_fmt == AV_PIX_FMT_YUV420P ||
2141  avctx->pix_fmt == AV_PIX_FMT_YUV420P16||
2142  avctx->pix_fmt == AV_PIX_FMT_YUVA420P ||
2143  avctx->pix_fmt == AV_PIX_FMT_YUVA420P16||
2144  avctx->pix_fmt == AV_PIX_FMT_GBRP ||
2145  avctx->pix_fmt == AV_PIX_FMT_GBRAP
2146  );
2147  avcodec_get_chroma_sub_sample(s->avctx->pix_fmt, &hshift, &vshift);
2148  for (p = 0; p<4; p++) {
2149  uint8_t *line = s->picture_ptr->data[p];
2150  int w = s->width;
2151  int h = s->height;
2152  if (!(s->upscale_h & (1<<p)))
2153  continue;
2154  if (p==1 || p==2) {
2155  w = FF_CEIL_RSHIFT(w, hshift);
2156  h = FF_CEIL_RSHIFT(h, vshift);
2157  }
2158  if (s->upscale_v & (1<<p))
2159  h = (h+1)>>1;
2160  av_assert0(w > 0);
2161  for (i = 0; i < h; i++) {
2162  if (is16bit) ((uint16_t*)line)[w - 1] = ((uint16_t*)line)[(w - 1) / 2];
2163  else line[w - 1] = line[(w - 1) / 2];
2164  for (index = w - 2; index > 0; index--) {
2165  if (is16bit)
2166  ((uint16_t*)line)[index] = (((uint16_t*)line)[index / 2] + ((uint16_t*)line)[(index + 1) / 2]) >> 1;
2167  else
2168  line[index] = (line[index / 2] + line[(index + 1) / 2]) >> 1;
2169  }
2170  line += s->linesize[p];
2171  }
2172  }
2173  }
2174  if (s->upscale_v) {
2175  int p;
2176  av_assert0(avctx->pix_fmt == AV_PIX_FMT_YUVJ444P ||
2177  avctx->pix_fmt == AV_PIX_FMT_YUV444P ||
2178  avctx->pix_fmt == AV_PIX_FMT_YUVJ422P ||
2179  avctx->pix_fmt == AV_PIX_FMT_YUV422P ||
2180  avctx->pix_fmt == AV_PIX_FMT_YUVJ420P ||
2181  avctx->pix_fmt == AV_PIX_FMT_YUV420P ||
2182  avctx->pix_fmt == AV_PIX_FMT_YUV440P ||
2183  avctx->pix_fmt == AV_PIX_FMT_YUVJ440P ||
2184  avctx->pix_fmt == AV_PIX_FMT_YUVA444P ||
2185  avctx->pix_fmt == AV_PIX_FMT_YUVA420P ||
2186  avctx->pix_fmt == AV_PIX_FMT_YUVA420P16||
2187  avctx->pix_fmt == AV_PIX_FMT_GBRP ||
2188  avctx->pix_fmt == AV_PIX_FMT_GBRAP
2189  );
2190  avcodec_get_chroma_sub_sample(s->avctx->pix_fmt, &hshift, &vshift);
2191  for (p = 0; p < 4; p++) {
2192  uint8_t *dst;
2193  int w = s->width;
2194  int h = s->height;
2195  if (!(s->upscale_v & (1<<p)))
2196  continue;
2197  if (p==1 || p==2) {
2198  w = FF_CEIL_RSHIFT(w, hshift);
2199  h = FF_CEIL_RSHIFT(h, vshift);
2200  }
2201  dst = &((uint8_t *)s->picture_ptr->data[p])[(h - 1) * s->linesize[p]];
2202  for (i = h - 1; i; i--) {
2203  uint8_t *src1 = &((uint8_t *)s->picture_ptr->data[p])[i / 2 * s->linesize[p]];
2204  uint8_t *src2 = &((uint8_t *)s->picture_ptr->data[p])[(i + 1) / 2 * s->linesize[p]];
2205  if (src1 == src2 || i == h - 1) {
2206  memcpy(dst, src1, w);
2207  } else {
2208  for (index = 0; index < w; index++)
2209  dst[index] = (src1[index] + src2[index]) >> 1;
2210  }
2211  dst -= s->linesize[p];
2212  }
2213  }
2214  }
2215  if (s->flipped) {
2216  int j;
2217  avcodec_get_chroma_sub_sample(s->avctx->pix_fmt, &hshift, &vshift);
2218  for (index=0; index<4; index++) {
2219  uint8_t *dst = s->picture_ptr->data[index];
2220  int w = s->picture_ptr->width;
2221  int h = s->picture_ptr->height;
2222  if(index && index<3){
2223  w = FF_CEIL_RSHIFT(w, hshift);
2224  h = FF_CEIL_RSHIFT(h, vshift);
2225  }
2226  if(dst){
2227  uint8_t *dst2 = dst + s->picture_ptr->linesize[index]*(h-1);
2228  for (i=0; i<h/2; i++) {
2229  for (j=0; j<w; j++)
2230  FFSWAP(int, dst[j], dst2[j]);
2231  dst += s->picture_ptr->linesize[index];
2232  dst2 -= s->picture_ptr->linesize[index];
2233  }
2234  }
2235  }
2236  }
2237  if (s->adobe_transform == 0 && s->avctx->pix_fmt == AV_PIX_FMT_GBRAP) {
2238  int w = s->picture_ptr->width;
2239  int h = s->picture_ptr->height;
2240  for (i=0; i<h; i++) {
2241  int j;
2242  uint8_t *dst[4];
2243  for (index=0; index<4; index++) {
2244  dst[index] = s->picture_ptr->data[index]
2245  + s->picture_ptr->linesize[index]*i;
2246  }
2247  for (j=0; j<w; j++) {
2248  int k = dst[3][j];
2249  int r = dst[0][j] * k;
2250  int g = dst[1][j] * k;
2251  int b = dst[2][j] * k;
2252  dst[0][j] = g*257 >> 16;
2253  dst[1][j] = b*257 >> 16;
2254  dst[2][j] = r*257 >> 16;
2255  dst[3][j] = 255;
2256  }
2257  }
2258  }
2259  if (s->adobe_transform == 2 && s->avctx->pix_fmt == AV_PIX_FMT_YUVA444P) {
2260  int w = s->picture_ptr->width;
2261  int h = s->picture_ptr->height;
2262  for (i=0; i<h; i++) {
2263  int j;
2264  uint8_t *dst[4];
2265  for (index=0; index<4; index++) {
2266  dst[index] = s->picture_ptr->data[index]
2267  + s->picture_ptr->linesize[index]*i;
2268  }
2269  for (j=0; j<w; j++) {
2270  int k = dst[3][j];
2271  int r = (255 - dst[0][j]) * k;
2272  int g = (128 - dst[1][j]) * k;
2273  int b = (128 - dst[2][j]) * k;
2274  dst[0][j] = r*257 >> 16;
2275  dst[1][j] = (g*257 >> 16) + 128;
2276  dst[2][j] = (b*257 >> 16) + 128;
2277  dst[3][j] = 255;
2278  }
2279  }
2280  }
2281 
2282  if (s->stereo3d) {
2283  AVStereo3D *stereo = av_stereo3d_create_side_data(data);
2284  if (stereo) {
2285  stereo->type = s->stereo3d->type;
2286  stereo->flags = s->stereo3d->flags;
2287  }
2288  av_freep(&s->stereo3d);
2289  }
2290 
2291  av_dict_copy(avpriv_frame_get_metadatap(data), s->exif_metadata, 0);
2292  av_dict_free(&s->exif_metadata);
2293 
2294  av_log(avctx, AV_LOG_DEBUG, "decode frame unused %"PTRDIFF_SPECIFIER" bytes\n",
2295  buf_end - buf_ptr);
2296 // return buf_end - buf_ptr;
2297  return buf_ptr - buf;
2298 }
2299 
2300 av_cold int ff_mjpeg_decode_end(AVCodecContext *avctx)
2301 {
2302  MJpegDecodeContext *s = avctx->priv_data;
2303  int i, j;
2304 
2305  if (s->interlaced && s->bottom_field == !s->interlace_polarity && s->got_picture && !avctx->frame_number) {
2306  av_log(avctx, AV_LOG_INFO, "Single field\n");
2307  }
2308 
2309  if (s->picture) {
2310  av_frame_free(&s->picture);
2311  s->picture_ptr = NULL;
2312  } else if (s->picture_ptr)
2313  av_frame_unref(s->picture_ptr);
2314 
2315  av_freep(&s->buffer);
2316  av_freep(&s->stereo3d);
2317  av_freep(&s->ljpeg_buffer);
2318  s->ljpeg_buffer_size = 0;
2319 
2320  for (i = 0; i < 3; i++) {
2321  for (j = 0; j < 4; j++)
2322  ff_free_vlc(&s->vlcs[i][j]);
2323  }
2324  for (i = 0; i < MAX_COMPONENTS; i++) {
2325  av_freep(&s->blocks[i]);
2326  av_freep(&s->last_nnz[i]);
2327  }
2328  av_dict_free(&s->exif_metadata);
2329  return 0;
2330 }
2331 
2332 static void decode_flush(AVCodecContext *avctx)
2333 {
2334  MJpegDecodeContext *s = avctx->priv_data;
2335  s->got_picture = 0;
2336 }
2337 
2338 #if CONFIG_MJPEG_DECODER
2339 #define OFFSET(x) offsetof(MJpegDecodeContext, x)
2340 #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
2341 static const AVOption options[] = {
2342  { "extern_huff", "Use external huffman table.",
2343  OFFSET(extern_huff), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VD },
2344  { NULL },
2345 };
2346 
2347 static const AVClass mjpegdec_class = {
2348  .class_name = "MJPEG decoder",
2349  .item_name = av_default_item_name,
2350  .option = options,
2351  .version = LIBAVUTIL_VERSION_INT,
2352 };
2353 
2354 AVCodec ff_mjpeg_decoder = {
2355  .name = "mjpeg",
2356  .long_name = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),
2357  .type = AVMEDIA_TYPE_VIDEO,
2358  .id = AV_CODEC_ID_MJPEG,
2359  .priv_data_size = sizeof(MJpegDecodeContext),
2360  .init = ff_mjpeg_decode_init,
2361  .close = ff_mjpeg_decode_end,
2362  .decode = ff_mjpeg_decode_frame,
2363  .flush = decode_flush,
2364  .capabilities = CODEC_CAP_DR1,
2365  .max_lowres = 3,
2366  .priv_class = &mjpegdec_class,
2367 };
2368 #endif
2369 #if CONFIG_THP_DECODER
2370 AVCodec ff_thp_decoder = {
2371  .name = "thp",
2372  .long_name = NULL_IF_CONFIG_SMALL("Nintendo Gamecube THP video"),
2373  .type = AVMEDIA_TYPE_VIDEO,
2374  .id = AV_CODEC_ID_THP,
2375  .priv_data_size = sizeof(MJpegDecodeContext),
2376  .init = ff_mjpeg_decode_init,
2377  .close = ff_mjpeg_decode_end,
2378  .decode = ff_mjpeg_decode_frame,
2379  .flush = decode_flush,
2380  .capabilities = CODEC_CAP_DR1,
2381  .max_lowres = 3,
2382 };
2383 #endif
Generated on Sun Mar 8 2015 02:34:56 for FFmpeg by   doxygen 1.8.2