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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 "copy_block.h"
38 #include "internal.h"
39 #include "mjpeg.h"
40 #include "mjpegdec.h"
41 #include "jpeglsdec.h"
42 
43 
44 static int build_vlc(VLC *vlc, const uint8_t *bits_table,
45  const uint8_t *val_table, int nb_codes,
46  int use_static, int is_ac)
47 {
48  uint8_t huff_size[256] = { 0 };
49  uint16_t huff_code[256];
50  uint16_t huff_sym[256];
51  int i;
52 
53  av_assert0(nb_codes <= 256);
54 
55  ff_mjpeg_build_huffman_codes(huff_size, huff_code, bits_table, val_table);
56 
57  for (i = 0; i < 256; i++)
58  huff_sym[i] = i + 16 * is_ac;
59 
60  if (is_ac)
61  huff_sym[0] = 16 * 256;
62 
63  return ff_init_vlc_sparse(vlc, 9, nb_codes, huff_size, 1, 1,
64  huff_code, 2, 2, huff_sym, 2, 2, use_static);
65 }
66 
67 static void build_basic_mjpeg_vlc(MJpegDecodeContext *s)
68 {
69  build_vlc(&s->vlcs[0][0], avpriv_mjpeg_bits_dc_luminance,
70  avpriv_mjpeg_val_dc, 12, 0, 0);
71  build_vlc(&s->vlcs[0][1], avpriv_mjpeg_bits_dc_chrominance,
72  avpriv_mjpeg_val_dc, 12, 0, 0);
73  build_vlc(&s->vlcs[1][0], avpriv_mjpeg_bits_ac_luminance,
74  avpriv_mjpeg_val_ac_luminance, 251, 0, 1);
75  build_vlc(&s->vlcs[1][1], avpriv_mjpeg_bits_ac_chrominance,
76  avpriv_mjpeg_val_ac_chrominance, 251, 0, 1);
77  build_vlc(&s->vlcs[2][0], avpriv_mjpeg_bits_ac_luminance,
78  avpriv_mjpeg_val_ac_luminance, 251, 0, 0);
79  build_vlc(&s->vlcs[2][1], avpriv_mjpeg_bits_ac_chrominance,
80  avpriv_mjpeg_val_ac_chrominance, 251, 0, 0);
81 }
82 
83 av_cold int ff_mjpeg_decode_init(AVCodecContext *avctx)
84 {
85  MJpegDecodeContext *s = avctx->priv_data;
86 
87  if (!s->picture_ptr)
88  s->picture_ptr = &s->picture;
89  avcodec_get_frame_defaults(&s->picture);
90 
91  s->avctx = avctx;
92  ff_hpeldsp_init(&s->hdsp, avctx->flags);
93  ff_dsputil_init(&s->dsp, avctx);
94  ff_init_scantable(s->dsp.idct_permutation, &s->scantable, ff_zigzag_direct);
95  s->buffer_size = 0;
96  s->buffer = NULL;
97  s->start_code = -1;
98  s->first_picture = 1;
99  s->got_picture = 0;
100  s->org_height = avctx->coded_height;
101  avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
102 
103  build_basic_mjpeg_vlc(s);
104 
105  if (s->extern_huff) {
106  av_log(avctx, AV_LOG_INFO, "using external huffman table\n");
107  init_get_bits(&s->gb, avctx->extradata, avctx->extradata_size * 8);
108  if (ff_mjpeg_decode_dht(s)) {
109  av_log(avctx, AV_LOG_ERROR,
110  "error using external huffman table, switching back to internal\n");
111  build_basic_mjpeg_vlc(s);
112  }
113  }
114  if (avctx->field_order == AV_FIELD_BB) { /* quicktime icefloe 019 */
115  s->interlace_polarity = 1; /* bottom field first */
116  av_log(avctx, AV_LOG_DEBUG, "bottom field first\n");
117  }
118  if (avctx->codec->id == AV_CODEC_ID_AMV)
119  s->flipped = 1;
120 
121  return 0;
122 }
123 
124 
125 /* quantize tables */
126 int ff_mjpeg_decode_dqt(MJpegDecodeContext *s)
127 {
128  int len, index, i, j;
129 
130  len = get_bits(&s->gb, 16) - 2;
131 
132  while (len >= 65) {
133  int pr = get_bits(&s->gb, 4);
134  if (pr > 1) {
135  av_log(s->avctx, AV_LOG_ERROR, "dqt: invalid precision\n");
136  return AVERROR_INVALIDDATA;
137  }
138  index = get_bits(&s->gb, 4);
139  if (index >= 4)
140  return -1;
141  av_log(s->avctx, AV_LOG_DEBUG, "index=%d\n", index);
142  /* read quant table */
143  for (i = 0; i < 64; i++) {
144  j = s->scantable.permutated[i];
145  s->quant_matrixes[index][j] = get_bits(&s->gb, pr ? 16 : 8);
146  }
147 
148  // XXX FIXME finetune, and perhaps add dc too
149  s->qscale[index] = FFMAX(s->quant_matrixes[index][s->scantable.permutated[1]],
150  s->quant_matrixes[index][s->scantable.permutated[8]]) >> 1;
151  av_log(s->avctx, AV_LOG_DEBUG, "qscale[%d]: %d\n",
152  index, s->qscale[index]);
153  len -= 65;
154  }
155  return 0;
156 }
157 
158 /* decode huffman tables and build VLC decoders */
159 int ff_mjpeg_decode_dht(MJpegDecodeContext *s)
160 {
161  int len, index, i, class, n, v, code_max;
162  uint8_t bits_table[17];
163  uint8_t val_table[256];
164  int ret = 0;
165 
166  len = get_bits(&s->gb, 16) - 2;
167 
168  while (len > 0) {
169  if (len < 17)
170  return AVERROR_INVALIDDATA;
171  class = get_bits(&s->gb, 4);
172  if (class >= 2)
173  return AVERROR_INVALIDDATA;
174  index = get_bits(&s->gb, 4);
175  if (index >= 4)
176  return AVERROR_INVALIDDATA;
177  n = 0;
178  for (i = 1; i <= 16; i++) {
179  bits_table[i] = get_bits(&s->gb, 8);
180  n += bits_table[i];
181  }
182  len -= 17;
183  if (len < n || n > 256)
184  return AVERROR_INVALIDDATA;
185 
186  code_max = 0;
187  for (i = 0; i < n; i++) {
188  v = get_bits(&s->gb, 8);
189  if (v > code_max)
190  code_max = v;
191  val_table[i] = v;
192  }
193  len -= n;
194 
195  /* build VLC and flush previous vlc if present */
196  ff_free_vlc(&s->vlcs[class][index]);
197  av_log(s->avctx, AV_LOG_DEBUG, "class=%d index=%d nb_codes=%d\n",
198  class, index, code_max + 1);
199  if ((ret = build_vlc(&s->vlcs[class][index], bits_table, val_table,
200  code_max + 1, 0, class > 0)) < 0)
201  return ret;
202 
203  if (class > 0) {
204  ff_free_vlc(&s->vlcs[2][index]);
205  if ((ret = build_vlc(&s->vlcs[2][index], bits_table, val_table,
206  code_max + 1, 0, 0)) < 0)
207  return ret;
208  }
209  }
210  return 0;
211 }
212 
213 int ff_mjpeg_decode_sof(MJpegDecodeContext *s)
214 {
215  int len, nb_components, i, width, height, pix_fmt_id;
216  int h_count[MAX_COMPONENTS];
217  int v_count[MAX_COMPONENTS];
218 
219  s->cur_scan = 0;
220  s->upscale_h = s->upscale_v = 0;
221 
222  /* XXX: verify len field validity */
223  len = get_bits(&s->gb, 16);
224  s->bits = get_bits(&s->gb, 8);
225 
226  if (s->pegasus_rct)
227  s->bits = 9;
228  if (s->bits == 9 && !s->pegasus_rct)
229  s->rct = 1; // FIXME ugly
230 
231  if (s->bits != 8 && !s->lossless) {
232  av_log(s->avctx, AV_LOG_ERROR, "only 8 bits/component accepted\n");
233  return -1;
234  }
235 
236  if(s->lossless && s->avctx->lowres){
237  av_log(s->avctx, AV_LOG_ERROR, "lowres is not possible with lossless jpeg\n");
238  return -1;
239  }
240 
241  height = get_bits(&s->gb, 16);
242  width = get_bits(&s->gb, 16);
243 
244  // HACK for odd_height.mov
245  if (s->interlaced && s->width == width && s->height == height + 1)
246  height= s->height;
247 
248  av_log(s->avctx, AV_LOG_DEBUG, "sof0: picture: %dx%d\n", width, height);
249  if (av_image_check_size(width, height, 0, s->avctx))
250  return AVERROR_INVALIDDATA;
251 
252  nb_components = get_bits(&s->gb, 8);
253  if (nb_components <= 0 ||
254  nb_components > MAX_COMPONENTS)
255  return -1;
256  if (s->interlaced && (s->bottom_field == !s->interlace_polarity)) {
257  if (nb_components != s->nb_components) {
258  av_log(s->avctx, AV_LOG_ERROR, "nb_components changing in interlaced picture\n");
259  return AVERROR_INVALIDDATA;
260  }
261  }
262  if (s->ls && !(s->bits <= 8 || nb_components == 1)) {
263  avpriv_report_missing_feature(s->avctx,
264  "JPEG-LS that is not <= 8 "
265  "bits/component or 16-bit gray");
266  return AVERROR_PATCHWELCOME;
267  }
268  s->nb_components = nb_components;
269  s->h_max = 1;
270  s->v_max = 1;
271  memset(h_count, 0, sizeof(h_count));
272  memset(v_count, 0, sizeof(v_count));
273  for (i = 0; i < nb_components; i++) {
274  /* component id */
275  s->component_id[i] = get_bits(&s->gb, 8) - 1;
276  h_count[i] = get_bits(&s->gb, 4);
277  v_count[i] = get_bits(&s->gb, 4);
278  /* compute hmax and vmax (only used in interleaved case) */
279  if (h_count[i] > s->h_max)
280  s->h_max = h_count[i];
281  if (v_count[i] > s->v_max)
282  s->v_max = v_count[i];
283  s->quant_index[i] = get_bits(&s->gb, 8);
284  if (s->quant_index[i] >= 4) {
285  av_log(s->avctx, AV_LOG_ERROR, "quant_index is invalid\n");
286  return AVERROR_INVALIDDATA;
287  }
288  if (!h_count[i] || !v_count[i]) {
289  av_log(s->avctx, AV_LOG_ERROR,
290  "Invalid sampling factor in component %d %d:%d\n",
291  i, h_count[i], v_count[i]);
292  return AVERROR_INVALIDDATA;
293  }
294 
295  av_log(s->avctx, AV_LOG_DEBUG, "component %d %d:%d id: %d quant:%d\n",
296  i, h_count[i], v_count[i],
297  s->component_id[i], s->quant_index[i]);
298  }
299 
300  if (s->ls && (s->h_max > 1 || s->v_max > 1)) {
301  avpriv_report_missing_feature(s->avctx, "Subsampling in JPEG-LS");
302  return AVERROR_PATCHWELCOME;
303  }
304 
305 
306  /* if different size, realloc/alloc picture */
307  if ( width != s->width || height != s->height
308  || memcmp(s->h_count, h_count, sizeof(h_count))
309  || memcmp(s->v_count, v_count, sizeof(v_count))) {
310 
311  s->width = width;
312  s->height = height;
313  memcpy(s->h_count, h_count, sizeof(h_count));
314  memcpy(s->v_count, v_count, sizeof(v_count));
315  s->interlaced = 0;
316  s->got_picture = 0;
317 
318  /* test interlaced mode */
319  if (s->first_picture &&
320  s->org_height != 0 &&
321  s->height < ((s->org_height * 3) / 4)) {
322  s->interlaced = 1;
323  s->bottom_field = s->interlace_polarity;
324  s->picture_ptr->interlaced_frame = 1;
325  s->picture_ptr->top_field_first = !s->interlace_polarity;
326  height *= 2;
327  }
328 
329  avcodec_set_dimensions(s->avctx, width, height);
330 
331  s->first_picture = 0;
332  }
333 
334  if (s->interlaced && (s->bottom_field == !s->interlace_polarity)) {
335  if (s->progressive) {
336  avpriv_request_sample(s->avctx, "progressively coded interlaced picture");
337  return AVERROR_INVALIDDATA;
338  }
339  } else{
340  if (s->v_max == 1 && s->h_max == 1 && s->lossless==1 && nb_components==3)
341  s->rgb = 1;
342  else if (!s->lossless)
343  s->rgb = 0;
344  /* XXX: not complete test ! */
345  pix_fmt_id = (s->h_count[0] << 28) | (s->v_count[0] << 24) |
346  (s->h_count[1] << 20) | (s->v_count[1] << 16) |
347  (s->h_count[2] << 12) | (s->v_count[2] << 8) |
348  (s->h_count[3] << 4) | s->v_count[3];
349  av_log(s->avctx, AV_LOG_DEBUG, "pix fmt id %x\n", pix_fmt_id);
350  /* NOTE we do not allocate pictures large enough for the possible
351  * padding of h/v_count being 4 */
352  if (!(pix_fmt_id & 0xD0D0D0D0))
353  pix_fmt_id -= (pix_fmt_id & 0xF0F0F0F0) >> 1;
354  if (!(pix_fmt_id & 0x0D0D0D0D))
355  pix_fmt_id -= (pix_fmt_id & 0x0F0F0F0F) >> 1;
356 
357  switch (pix_fmt_id) {
358  case 0x11111100:
359  if (s->rgb)
360  s->avctx->pix_fmt = AV_PIX_FMT_BGR24;
361  else {
362  if (s->component_id[0] == 'Q' && s->component_id[1] == 'F' && s->component_id[2] == 'A') {
363  s->avctx->pix_fmt = AV_PIX_FMT_GBR24P;
364  } else {
365  s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV444P : AV_PIX_FMT_YUVJ444P;
366  s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
367  }
368  }
369  av_assert0(s->nb_components == 3);
370  break;
371  case 0x12121100:
372  case 0x22122100:
373  s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV444P : AV_PIX_FMT_YUVJ444P;
374  s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
375  s->upscale_v = 2;
376  s->upscale_h = (pix_fmt_id == 0x22122100);
377  s->chroma_height = s->height;
378  break;
379  case 0x21211100:
380  case 0x22211200:
381  s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV444P : AV_PIX_FMT_YUVJ444P;
382  s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
383  s->upscale_v = (pix_fmt_id == 0x22211200);
384  s->upscale_h = 2;
385  s->chroma_height = s->height;
386  break;
387  case 0x22221100:
388  s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV444P : AV_PIX_FMT_YUVJ444P;
389  s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
390  s->upscale_v = 2;
391  s->upscale_h = 2;
392  s->chroma_height = s->height / 2;
393  break;
394  case 0x11000000:
395  case 0x13000000:
396  case 0x14000000:
397  case 0x31000000:
398  case 0x33000000:
399  case 0x34000000:
400  case 0x41000000:
401  case 0x43000000:
402  case 0x44000000:
403  if(s->bits <= 8)
404  s->avctx->pix_fmt = AV_PIX_FMT_GRAY8;
405  else
406  s->avctx->pix_fmt = AV_PIX_FMT_GRAY16;
407  break;
408  case 0x12111100:
409  case 0x22211100:
410  case 0x22112100:
411  s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV440P : AV_PIX_FMT_YUVJ440P;
412  s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
413  s->upscale_h = (pix_fmt_id == 0x22211100) * 2 + (pix_fmt_id == 0x22112100);
414  s->chroma_height = s->height / 2;
415  break;
416  case 0x21111100:
417  s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV422P : AV_PIX_FMT_YUVJ422P;
418  s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
419  break;
420  case 0x22121100:
421  case 0x22111200:
422  s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV422P : AV_PIX_FMT_YUVJ422P;
423  s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
424  s->upscale_v = (pix_fmt_id == 0x22121100) + 1;
425  break;
426  case 0x22111100:
427  s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV420P : AV_PIX_FMT_YUVJ420P;
428  s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
429  break;
430  case 0x41111100:
431  s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV411P : AV_PIX_FMT_YUVJ411P;
432  s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
433  break;
434  default:
435  av_log(s->avctx, AV_LOG_ERROR, "Unhandled pixel format 0x%x\n", pix_fmt_id);
436  return AVERROR_PATCHWELCOME;
437  }
438  if ((s->upscale_h || s->upscale_v) && s->avctx->lowres) {
439  av_log(s->avctx, AV_LOG_ERROR, "lowres not supported for weird subsampling\n");
440  return AVERROR_PATCHWELCOME;
441  }
442  if (s->ls) {
443  s->upscale_h = s->upscale_v = 0;
444  if (s->nb_components > 1)
445  s->avctx->pix_fmt = AV_PIX_FMT_RGB24;
446  else if (s->bits <= 8)
447  s->avctx->pix_fmt = AV_PIX_FMT_GRAY8;
448  else
449  s->avctx->pix_fmt = AV_PIX_FMT_GRAY16;
450  }
451 
452  av_frame_unref(s->picture_ptr);
453  if (ff_get_buffer(s->avctx, s->picture_ptr, AV_GET_BUFFER_FLAG_REF) < 0)
454  return -1;
455  s->picture_ptr->pict_type = AV_PICTURE_TYPE_I;
456  s->picture_ptr->key_frame = 1;
457  s->got_picture = 1;
458 
459  for (i = 0; i < 3; i++)
460  s->linesize[i] = s->picture_ptr->linesize[i] << s->interlaced;
461 
462  av_dlog(s->avctx, "%d %d %d %d %d %d\n",
463  s->width, s->height, s->linesize[0], s->linesize[1],
464  s->interlaced, s->avctx->height);
465 
466  if (len != (8 + (3 * nb_components)))
467  av_log(s->avctx, AV_LOG_DEBUG, "decode_sof0: error, len(%d) mismatch\n", len);
468  }
469 
470  if (s->rgb && !s->lossless && !s->ls) {
471  av_log(s->avctx, AV_LOG_ERROR, "Unsupported coding and pixel format combination\n");
472  return AVERROR_PATCHWELCOME;
473  }
474 
475  /* totally blank picture as progressive JPEG will only add details to it */
476  if (s->progressive) {
477  int bw = (width + s->h_max * 8 - 1) / (s->h_max * 8);
478  int bh = (height + s->v_max * 8 - 1) / (s->v_max * 8);
479  for (i = 0; i < s->nb_components; i++) {
480  int size = bw * bh * s->h_count[i] * s->v_count[i];
481  av_freep(&s->blocks[i]);
482  av_freep(&s->last_nnz[i]);
483  s->blocks[i] = av_malloc(size * sizeof(**s->blocks));
484  s->last_nnz[i] = av_mallocz(size * sizeof(**s->last_nnz));
485  s->block_stride[i] = bw * s->h_count[i];
486  }
487  memset(s->coefs_finished, 0, sizeof(s->coefs_finished));
488  }
489  return 0;
490 }
491 
492 static inline int mjpeg_decode_dc(MJpegDecodeContext *s, int dc_index)
493 {
494  int code;
495  code = get_vlc2(&s->gb, s->vlcs[0][dc_index].table, 9, 2);
496  if (code < 0) {
497  av_log(s->avctx, AV_LOG_WARNING,
498  "mjpeg_decode_dc: bad vlc: %d:%d (%p)\n",
499  0, dc_index, &s->vlcs[0][dc_index]);
500  return 0xffff;
501  }
502 
503  if (code)
504  return get_xbits(&s->gb, code);
505  else
506  return 0;
507 }
508 
509 /* decode block and dequantize */
510 static int decode_block(MJpegDecodeContext *s, int16_t *block, int component,
511  int dc_index, int ac_index, int16_t *quant_matrix)
512 {
513  int code, i, j, level, val;
514 
515  /* DC coef */
516  val = mjpeg_decode_dc(s, dc_index);
517  if (val == 0xffff) {
518  av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
519  return AVERROR_INVALIDDATA;
520  }
521  val = val * quant_matrix[0] + s->last_dc[component];
522  s->last_dc[component] = val;
523  block[0] = val;
524  /* AC coefs */
525  i = 0;
526  {OPEN_READER(re, &s->gb);
527  do {
528  UPDATE_CACHE(re, &s->gb);
529  GET_VLC(code, re, &s->gb, s->vlcs[1][ac_index].table, 9, 2);
530 
531  i += ((unsigned)code) >> 4;
532  code &= 0xf;
533  if (code) {
534  if (code > MIN_CACHE_BITS - 16)
535  UPDATE_CACHE(re, &s->gb);
536 
537  {
538  int cache = GET_CACHE(re, &s->gb);
539  int sign = (~cache) >> 31;
540  level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
541  }
542 
543  LAST_SKIP_BITS(re, &s->gb, code);
544 
545  if (i > 63) {
546  av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
547  return AVERROR_INVALIDDATA;
548  }
549  j = s->scantable.permutated[i];
550  block[j] = level * quant_matrix[j];
551  }
552  } while (i < 63);
553  CLOSE_READER(re, &s->gb);}
554 
555  return 0;
556 }
557 
558 static int decode_dc_progressive(MJpegDecodeContext *s, int16_t *block,
559  int component, int dc_index,
560  int16_t *quant_matrix, int Al)
561 {
562  int val;
563  s->dsp.clear_block(block);
564  val = mjpeg_decode_dc(s, dc_index);
565  if (val == 0xffff) {
566  av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
567  return AVERROR_INVALIDDATA;
568  }
569  val = (val * quant_matrix[0] << Al) + s->last_dc[component];
570  s->last_dc[component] = val;
571  block[0] = val;
572  return 0;
573 }
574 
575 /* decode block and dequantize - progressive JPEG version */
576 static int decode_block_progressive(MJpegDecodeContext *s, int16_t *block,
577  uint8_t *last_nnz, int ac_index,
578  int16_t *quant_matrix,
579  int ss, int se, int Al, int *EOBRUN)
580 {
581  int code, i, j, level, val, run;
582 
583  if (*EOBRUN) {
584  (*EOBRUN)--;
585  return 0;
586  }
587 
588  {
589  OPEN_READER(re, &s->gb);
590  for (i = ss; ; i++) {
591  UPDATE_CACHE(re, &s->gb);
592  GET_VLC(code, re, &s->gb, s->vlcs[2][ac_index].table, 9, 2);
593 
594  run = ((unsigned) code) >> 4;
595  code &= 0xF;
596  if (code) {
597  i += run;
598  if (code > MIN_CACHE_BITS - 16)
599  UPDATE_CACHE(re, &s->gb);
600 
601  {
602  int cache = GET_CACHE(re, &s->gb);
603  int sign = (~cache) >> 31;
604  level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
605  }
606 
607  LAST_SKIP_BITS(re, &s->gb, code);
608 
609  if (i >= se) {
610  if (i == se) {
611  j = s->scantable.permutated[se];
612  block[j] = level * quant_matrix[j] << Al;
613  break;
614  }
615  av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
616  return AVERROR_INVALIDDATA;
617  }
618  j = s->scantable.permutated[i];
619  block[j] = level * quant_matrix[j] << Al;
620  } else {
621  if (run == 0xF) {// ZRL - skip 15 coefficients
622  i += 15;
623  if (i >= se) {
624  av_log(s->avctx, AV_LOG_ERROR, "ZRL overflow: %d\n", i);
625  return AVERROR_INVALIDDATA;
626  }
627  } else {
628  val = (1 << run);
629  if (run) {
630  UPDATE_CACHE(re, &s->gb);
631  val += NEG_USR32(GET_CACHE(re, &s->gb), run);
632  LAST_SKIP_BITS(re, &s->gb, run);
633  }
634  *EOBRUN = val - 1;
635  break;
636  }
637  }
638  }
639  CLOSE_READER(re, &s->gb);
640  }
641 
642  if (i > *last_nnz)
643  *last_nnz = i;
644 
645  return 0;
646 }
647 
648 #define REFINE_BIT(j) { \
649  UPDATE_CACHE(re, &s->gb); \
650  sign = block[j] >> 15; \
651  block[j] += SHOW_UBITS(re, &s->gb, 1) * \
652  ((quant_matrix[j] ^ sign) - sign) << Al; \
653  LAST_SKIP_BITS(re, &s->gb, 1); \
654 }
655 
656 #define ZERO_RUN \
657 for (; ; i++) { \
658  if (i > last) { \
659  i += run; \
660  if (i > se) { \
661  av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i); \
662  return -1; \
663  } \
664  break; \
665  } \
666  j = s->scantable.permutated[i]; \
667  if (block[j]) \
668  REFINE_BIT(j) \
669  else if (run-- == 0) \
670  break; \
671 }
672 
673 /* decode block and dequantize - progressive JPEG refinement pass */
674 static int decode_block_refinement(MJpegDecodeContext *s, int16_t *block,
675  uint8_t *last_nnz,
676  int ac_index, int16_t *quant_matrix,
677  int ss, int se, int Al, int *EOBRUN)
678 {
679  int code, i = ss, j, sign, val, run;
680  int last = FFMIN(se, *last_nnz);
681 
682  OPEN_READER(re, &s->gb);
683  if (*EOBRUN) {
684  (*EOBRUN)--;
685  } else {
686  for (; ; i++) {
687  UPDATE_CACHE(re, &s->gb);
688  GET_VLC(code, re, &s->gb, s->vlcs[2][ac_index].table, 9, 2);
689 
690  if (code & 0xF) {
691  run = ((unsigned) code) >> 4;
692  UPDATE_CACHE(re, &s->gb);
693  val = SHOW_UBITS(re, &s->gb, 1);
694  LAST_SKIP_BITS(re, &s->gb, 1);
695  ZERO_RUN;
696  j = s->scantable.permutated[i];
697  val--;
698  block[j] = ((quant_matrix[j]^val) - val) << Al;
699  if (i == se) {
700  if (i > *last_nnz)
701  *last_nnz = i;
702  CLOSE_READER(re, &s->gb);
703  return 0;
704  }
705  } else {
706  run = ((unsigned) code) >> 4;
707  if (run == 0xF) {
708  ZERO_RUN;
709  } else {
710  val = run;
711  run = (1 << run);
712  if (val) {
713  UPDATE_CACHE(re, &s->gb);
714  run += SHOW_UBITS(re, &s->gb, val);
715  LAST_SKIP_BITS(re, &s->gb, val);
716  }
717  *EOBRUN = run - 1;
718  break;
719  }
720  }
721  }
722 
723  if (i > *last_nnz)
724  *last_nnz = i;
725  }
726 
727  for (; i <= last; i++) {
728  j = s->scantable.permutated[i];
729  if (block[j])
730  REFINE_BIT(j)
731  }
732  CLOSE_READER(re, &s->gb);
733 
734  return 0;
735 }
736 #undef REFINE_BIT
737 #undef ZERO_RUN
738 
739 static void handle_rstn(MJpegDecodeContext *s, int nb_components)
740 {
741  int i;
742  if (s->restart_interval) {
743  s->restart_count--;
744  if(s->restart_count == 0 && s->avctx->codec_id == AV_CODEC_ID_THP){
745  align_get_bits(&s->gb);
746  for (i = 0; i < nb_components; i++) /* reset dc */
747  s->last_dc[i] = 1024;
748  }
749 
750  i = 8 + ((-get_bits_count(&s->gb)) & 7);
751  /* skip RSTn */
752  if (s->restart_count == 0) {
753  if( show_bits(&s->gb, i) == (1 << i) - 1
754  || show_bits(&s->gb, i) == 0xFF) {
755  int pos = get_bits_count(&s->gb);
756  align_get_bits(&s->gb);
757  while (get_bits_left(&s->gb) >= 8 && show_bits(&s->gb, 8) == 0xFF)
758  skip_bits(&s->gb, 8);
759  if (get_bits_left(&s->gb) >= 8 && (get_bits(&s->gb, 8) & 0xF8) == 0xD0) {
760  for (i = 0; i < nb_components; i++) /* reset dc */
761  s->last_dc[i] = 1024;
762  } else
763  skip_bits_long(&s->gb, pos - get_bits_count(&s->gb));
764  }
765  }
766  }
767 }
768 
769 static int ljpeg_decode_rgb_scan(MJpegDecodeContext *s, int nb_components, int predictor, int point_transform)
770 {
771  int i, mb_x, mb_y;
772  uint16_t (*buffer)[4];
773  int left[3], top[3], topleft[3];
774  const int linesize = s->linesize[0];
775  const int mask = (1 << s->bits) - 1;
776  int resync_mb_y = 0;
777  int resync_mb_x = 0;
778 
779  s->restart_count = s->restart_interval;
780 
781  av_fast_malloc(&s->ljpeg_buffer, &s->ljpeg_buffer_size,
782  (unsigned)s->mb_width * 4 * sizeof(s->ljpeg_buffer[0][0]));
783  buffer = s->ljpeg_buffer;
784 
785  for (i = 0; i < 3; i++)
786  buffer[0][i] = 1 << (s->bits - 1);
787 
788  for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
789  uint8_t *ptr = s->picture.data[0] + (linesize * mb_y);
790 
791  if (s->interlaced && s->bottom_field)
792  ptr += linesize >> 1;
793 
794  for (i = 0; i < 3; i++)
795  top[i] = left[i] = topleft[i] = buffer[0][i];
796 
797  for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
798  int modified_predictor = predictor;
799 
800  if (s->restart_interval && !s->restart_count){
801  s->restart_count = s->restart_interval;
802  resync_mb_x = mb_x;
803  resync_mb_y = mb_y;
804  for(i=0; i<3; i++)
805  top[i] = left[i]= topleft[i]= 1 << (s->bits - 1);
806  }
807  if (mb_y == resync_mb_y || mb_y == resync_mb_y+1 && mb_x < resync_mb_x || !mb_x)
808  modified_predictor = 1;
809 
810  for (i=0;i<nb_components;i++) {
811  int pred, dc;
812 
813  topleft[i] = top[i];
814  top[i] = buffer[mb_x][i];
815 
816  PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
817 
818  dc = mjpeg_decode_dc(s, s->dc_index[i]);
819  if(dc == 0xFFFF)
820  return -1;
821 
822  left[i] = buffer[mb_x][i] =
823  mask & (pred + (dc << point_transform));
824  }
825 
826  if (s->restart_interval && !--s->restart_count) {
827  align_get_bits(&s->gb);
828  skip_bits(&s->gb, 16); /* skip RSTn */
829  }
830  }
831 
832  if (s->rct) {
833  for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
834  ptr[3*mb_x + 1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2] - 0x200) >> 2);
835  ptr[3*mb_x + 0] = buffer[mb_x][1] + ptr[3*mb_x + 1];
836  ptr[3*mb_x + 2] = buffer[mb_x][2] + ptr[3*mb_x + 1];
837  }
838  } else if (s->pegasus_rct) {
839  for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
840  ptr[3*mb_x + 1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2]) >> 2);
841  ptr[3*mb_x + 0] = buffer[mb_x][1] + ptr[3*mb_x + 1];
842  ptr[3*mb_x + 2] = buffer[mb_x][2] + ptr[3*mb_x + 1];
843  }
844  } else {
845  for(i=0; i<nb_components; i++) {
846  int c= s->comp_index[i];
847  for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
848  ptr[3*mb_x+2-c] = buffer[mb_x][i];
849  }
850  }
851  }
852  }
853  return 0;
854 }
855 
856 static int ljpeg_decode_yuv_scan(MJpegDecodeContext *s, int predictor,
857  int point_transform, int nb_components)
858 {
859  int i, mb_x, mb_y;
860  int bits= (s->bits+7)&~7;
861  int resync_mb_y = 0;
862  int resync_mb_x = 0;
863 
864  point_transform += bits - s->bits;
865 
866  av_assert0(nb_components>=1 && nb_components<=3);
867 
868  for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
869  for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
870  if (s->restart_interval && !s->restart_count){
871  s->restart_count = s->restart_interval;
872  resync_mb_x = mb_x;
873  resync_mb_y = mb_y;
874  }
875 
876  if(!mb_x || mb_y == resync_mb_y || mb_y == resync_mb_y+1 && mb_x < resync_mb_x || s->interlaced){
877  int toprow = mb_y == resync_mb_y || mb_y == resync_mb_y+1 && mb_x < resync_mb_x;
878  int leftcol = !mb_x || mb_y == resync_mb_y && mb_x == resync_mb_x;
879  for (i = 0; i < nb_components; i++) {
880  uint8_t *ptr;
881  uint16_t *ptr16;
882  int n, h, v, x, y, c, j, linesize;
883  n = s->nb_blocks[i];
884  c = s->comp_index[i];
885  h = s->h_scount[i];
886  v = s->v_scount[i];
887  x = 0;
888  y = 0;
889  linesize= s->linesize[c];
890 
891  if(bits>8) linesize /= 2;
892 
893  for(j=0; j<n; j++) {
894  int pred, dc;
895 
896  dc = mjpeg_decode_dc(s, s->dc_index[i]);
897  if(dc == 0xFFFF)
898  return -1;
899  if(bits<=8){
900  ptr = s->picture.data[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
901  if(y==0 && toprow){
902  if(x==0 && leftcol){
903  pred= 1 << (bits - 1);
904  }else{
905  pred= ptr[-1];
906  }
907  }else{
908  if(x==0 && leftcol){
909  pred= ptr[-linesize];
910  }else{
911  PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
912  }
913  }
914 
915  if (s->interlaced && s->bottom_field)
916  ptr += linesize >> 1;
917  pred &= (-1)<<(8-s->bits);
918  *ptr= pred + (dc << point_transform);
919  }else{
920  ptr16 = (uint16_t*)(s->picture.data[c] + 2*(linesize * (v * mb_y + y)) + 2*(h * mb_x + x)); //FIXME optimize this crap
921  if(y==0 && toprow){
922  if(x==0 && leftcol){
923  pred= 1 << (bits - 1);
924  }else{
925  pred= ptr16[-1];
926  }
927  }else{
928  if(x==0 && leftcol){
929  pred= ptr16[-linesize];
930  }else{
931  PREDICT(pred, ptr16[-linesize-1], ptr16[-linesize], ptr16[-1], predictor);
932  }
933  }
934 
935  if (s->interlaced && s->bottom_field)
936  ptr16 += linesize >> 1;
937  pred &= (-1)<<(16-s->bits);
938  *ptr16= pred + (dc << point_transform);
939  }
940  if (++x == h) {
941  x = 0;
942  y++;
943  }
944  }
945  }
946  } else {
947  for (i = 0; i < nb_components; i++) {
948  uint8_t *ptr;
949  uint16_t *ptr16;
950  int n, h, v, x, y, c, j, linesize, dc;
951  n = s->nb_blocks[i];
952  c = s->comp_index[i];
953  h = s->h_scount[i];
954  v = s->v_scount[i];
955  x = 0;
956  y = 0;
957  linesize = s->linesize[c];
958 
959  if(bits>8) linesize /= 2;
960 
961  for (j = 0; j < n; j++) {
962  int pred;
963 
964  dc = mjpeg_decode_dc(s, s->dc_index[i]);
965  if(dc == 0xFFFF)
966  return -1;
967  if(bits<=8){
968  ptr = s->picture.data[c] +
969  (linesize * (v * mb_y + y)) +
970  (h * mb_x + x); //FIXME optimize this crap
971  PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
972 
973  pred &= (-1)<<(8-s->bits);
974  *ptr = pred + (dc << point_transform);
975  }else{
976  ptr16 = (uint16_t*)(s->picture.data[c] + 2*(linesize * (v * mb_y + y)) + 2*(h * mb_x + x)); //FIXME optimize this crap
977  PREDICT(pred, ptr16[-linesize-1], ptr16[-linesize], ptr16[-1], predictor);
978 
979  pred &= (-1)<<(16-s->bits);
980  *ptr16= pred + (dc << point_transform);
981  }
982 
983  if (++x == h) {
984  x = 0;
985  y++;
986  }
987  }
988  }
989  }
990  if (s->restart_interval && !--s->restart_count) {
991  align_get_bits(&s->gb);
992  skip_bits(&s->gb, 16); /* skip RSTn */
993  }
994  }
995  }
996  return 0;
997 }
998 
999 static av_always_inline void mjpeg_copy_block(MJpegDecodeContext *s,
1000  uint8_t *dst, const uint8_t *src,
1001  int linesize, int lowres)
1002 {
1003  switch (lowres) {
1004  case 0: s->hdsp.put_pixels_tab[1][0](dst, src, linesize, 8);
1005  break;
1006  case 1: copy_block4(dst, src, linesize, linesize, 4);
1007  break;
1008  case 2: copy_block2(dst, src, linesize, linesize, 2);
1009  break;
1010  case 3: *dst = *src;
1011  break;
1012  }
1013 }
1014 
1015 static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int Ah,
1016  int Al, const uint8_t *mb_bitmask,
1017  const AVFrame *reference)
1018 {
1019  int i, mb_x, mb_y;
1020  uint8_t *data[MAX_COMPONENTS];
1021  const uint8_t *reference_data[MAX_COMPONENTS];
1022  int linesize[MAX_COMPONENTS];
1023  GetBitContext mb_bitmask_gb;
1024 
1025  if (mb_bitmask)
1026  init_get_bits(&mb_bitmask_gb, mb_bitmask, s->mb_width * s->mb_height);
1027 
1028  if (s->flipped && s->avctx->lowres) {
1029  av_log(s->avctx, AV_LOG_ERROR, "Can not flip image with lowres\n");
1030  s->flipped = 0;
1031  }
1032 
1033  for (i = 0; i < nb_components; i++) {
1034  int c = s->comp_index[i];
1035  data[c] = s->picture_ptr->data[c];
1036  reference_data[c] = reference ? reference->data[c] : NULL;
1037  linesize[c] = s->linesize[c];
1038  s->coefs_finished[c] |= 1;
1039  if (s->flipped && !(s->avctx->flags & CODEC_FLAG_EMU_EDGE)) {
1040  // picture should be flipped upside-down for this codec
1041  int offset = (linesize[c] * (s->v_scount[i] *
1042  (8 * s->mb_height - ((s->height / s->v_max) & 7)) - 1));
1043  data[c] += offset;
1044  reference_data[c] += offset;
1045  linesize[c] *= -1;
1046  }
1047  }
1048 
1049  for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
1050  for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
1051  const int copy_mb = mb_bitmask && !get_bits1(&mb_bitmask_gb);
1052 
1053  if (s->restart_interval && !s->restart_count)
1054  s->restart_count = s->restart_interval;
1055 
1056  if (get_bits_left(&s->gb) < 0) {
1057  av_log(s->avctx, AV_LOG_ERROR, "overread %d\n",
1058  -get_bits_left(&s->gb));
1059  return AVERROR_INVALIDDATA;
1060  }
1061  for (i = 0; i < nb_components; i++) {
1062  uint8_t *ptr;
1063  int n, h, v, x, y, c, j;
1064  int block_offset;
1065  n = s->nb_blocks[i];
1066  c = s->comp_index[i];
1067  h = s->h_scount[i];
1068  v = s->v_scount[i];
1069  x = 0;
1070  y = 0;
1071  for (j = 0; j < n; j++) {
1072  block_offset = (((linesize[c] * (v * mb_y + y) * 8) +
1073  (h * mb_x + x) * 8) >> s->avctx->lowres);
1074 
1075  if (s->interlaced && s->bottom_field)
1076  block_offset += linesize[c] >> 1;
1077  ptr = data[c] + block_offset;
1078  if (!s->progressive) {
1079  if (copy_mb)
1080  mjpeg_copy_block(s, ptr, reference_data[c] + block_offset,
1081  linesize[c], s->avctx->lowres);
1082 
1083  else {
1084  s->dsp.clear_block(s->block);
1085  if (decode_block(s, s->block, i,
1086  s->dc_index[i], s->ac_index[i],
1087  s->quant_matrixes[s->quant_index[c]]) < 0) {
1088  av_log(s->avctx, AV_LOG_ERROR,
1089  "error y=%d x=%d\n", mb_y, mb_x);
1090  return AVERROR_INVALIDDATA;
1091  }
1092  s->dsp.idct_put(ptr, linesize[c], s->block);
1093  }
1094  } else {
1095  int block_idx = s->block_stride[c] * (v * mb_y + y) +
1096  (h * mb_x + x);
1097  int16_t *block = s->blocks[c][block_idx];
1098  if (Ah)
1099  block[0] += get_bits1(&s->gb) *
1100  s->quant_matrixes[s->quant_index[c]][0] << Al;
1101  else if (decode_dc_progressive(s, block, i, s->dc_index[i],
1102  s->quant_matrixes[s->quant_index[c]],
1103  Al) < 0) {
1104  av_log(s->avctx, AV_LOG_ERROR,
1105  "error y=%d x=%d\n", mb_y, mb_x);
1106  return AVERROR_INVALIDDATA;
1107  }
1108  }
1109  av_dlog(s->avctx, "mb: %d %d processed\n", mb_y, mb_x);
1110  av_dlog(s->avctx, "%d %d %d %d %d %d %d %d \n",
1111  mb_x, mb_y, x, y, c, s->bottom_field,
1112  (v * mb_y + y) * 8, (h * mb_x + x) * 8);
1113  if (++x == h) {
1114  x = 0;
1115  y++;
1116  }
1117  }
1118  }
1119 
1120  handle_rstn(s, nb_components);
1121  }
1122  }
1123  return 0;
1124 }
1125 
1126 static int mjpeg_decode_scan_progressive_ac(MJpegDecodeContext *s, int ss,
1127  int se, int Ah, int Al)
1128 {
1129  int mb_x, mb_y;
1130  int EOBRUN = 0;
1131  int c = s->comp_index[0];
1132  uint8_t *data = s->picture.data[c];
1133  int linesize = s->linesize[c];
1134  int last_scan = 0;
1135  int16_t *quant_matrix = s->quant_matrixes[s->quant_index[c]];
1136 
1137  av_assert0(ss>=0 && Ah>=0 && Al>=0);
1138  if (se < ss || se > 63) {
1139  av_log(s->avctx, AV_LOG_ERROR, "SS/SE %d/%d is invalid\n", ss, se);
1140  return AVERROR_INVALIDDATA;
1141  }
1142 
1143  if (!Al) {
1144  s->coefs_finished[c] |= (1LL << (se + 1)) - (1LL << ss);
1145  last_scan = !~s->coefs_finished[c];
1146  }
1147 
1148  if (s->interlaced && s->bottom_field)
1149  data += linesize >> 1;
1150 
1151  s->restart_count = 0;
1152 
1153  for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
1154  uint8_t *ptr = data + (mb_y * linesize * 8 >> s->avctx->lowres);
1155  int block_idx = mb_y * s->block_stride[c];
1156  int16_t (*block)[64] = &s->blocks[c][block_idx];
1157  uint8_t *last_nnz = &s->last_nnz[c][block_idx];
1158  for (mb_x = 0; mb_x < s->mb_width; mb_x++, block++, last_nnz++) {
1159  int ret;
1160  if (s->restart_interval && !s->restart_count)
1161  s->restart_count = s->restart_interval;
1162 
1163  if (Ah)
1164  ret = decode_block_refinement(s, *block, last_nnz, s->ac_index[0],
1165  quant_matrix, ss, se, Al, &EOBRUN);
1166  else
1167  ret = decode_block_progressive(s, *block, last_nnz, s->ac_index[0],
1168  quant_matrix, ss, se, Al, &EOBRUN);
1169  if (ret < 0) {
1170  av_log(s->avctx, AV_LOG_ERROR,
1171  "error y=%d x=%d\n", mb_y, mb_x);
1172  return AVERROR_INVALIDDATA;
1173  }
1174 
1175  if (last_scan) {
1176  s->dsp.idct_put(ptr, linesize, *block);
1177  ptr += 8 >> s->avctx->lowres;
1178  }
1179  handle_rstn(s, 0);
1180  }
1181  }
1182  return 0;
1183 }
1184 
1185 int ff_mjpeg_decode_sos(MJpegDecodeContext *s, const uint8_t *mb_bitmask,
1186  const AVFrame *reference)
1187 {
1188  int len, nb_components, i, h, v, predictor, point_transform;
1189  int index, id, ret;
1190  const int block_size = s->lossless ? 1 : 8;
1191  int ilv, prev_shift;
1192 
1193  if (!s->got_picture) {
1194  av_log(s->avctx, AV_LOG_WARNING,
1195  "Can not process SOS before SOF, skipping\n");
1196  return -1;
1197  }
1198 
1199  av_assert0(s->picture_ptr->data[0]);
1200  /* XXX: verify len field validity */
1201  len = get_bits(&s->gb, 16);
1202  nb_components = get_bits(&s->gb, 8);
1203  if (nb_components == 0 || nb_components > MAX_COMPONENTS) {
1204  av_log(s->avctx, AV_LOG_ERROR,
1205  "decode_sos: nb_components (%d) unsupported\n", nb_components);
1206  return AVERROR_PATCHWELCOME;
1207  }
1208  if (len != 6 + 2 * nb_components) {
1209  av_log(s->avctx, AV_LOG_ERROR, "decode_sos: invalid len (%d)\n", len);
1210  return AVERROR_INVALIDDATA;
1211  }
1212  for (i = 0; i < nb_components; i++) {
1213  id = get_bits(&s->gb, 8) - 1;
1214  av_log(s->avctx, AV_LOG_DEBUG, "component: %d\n", id);
1215  /* find component index */
1216  for (index = 0; index < s->nb_components; index++)
1217  if (id == s->component_id[index])
1218  break;
1219  if (index == s->nb_components) {
1220  av_log(s->avctx, AV_LOG_ERROR,
1221  "decode_sos: index(%d) out of components\n", index);
1222  return AVERROR_INVALIDDATA;
1223  }
1224  /* Metasoft MJPEG codec has Cb and Cr swapped */
1225  if (s->avctx->codec_tag == MKTAG('M', 'T', 'S', 'J')
1226  && nb_components == 3 && s->nb_components == 3 && i)
1227  index = 3 - i;
1228 
1229  if(nb_components == 3 && s->nb_components == 3 && s->avctx->pix_fmt == AV_PIX_FMT_GBR24P)
1230  index = (i+2)%3;
1231  if(nb_components == 1 && s->nb_components == 3 && s->avctx->pix_fmt == AV_PIX_FMT_GBR24P)
1232  index = (index+2)%3;
1233 
1234  s->comp_index[i] = index;
1235 
1236  s->nb_blocks[i] = s->h_count[index] * s->v_count[index];
1237  s->h_scount[i] = s->h_count[index];
1238  s->v_scount[i] = s->v_count[index];
1239 
1240  s->dc_index[i] = get_bits(&s->gb, 4);
1241  s->ac_index[i] = get_bits(&s->gb, 4);
1242 
1243  if (s->dc_index[i] < 0 || s->ac_index[i] < 0 ||
1244  s->dc_index[i] >= 4 || s->ac_index[i] >= 4)
1245  goto out_of_range;
1246  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))
1247  goto out_of_range;
1248  }
1249 
1250  predictor = get_bits(&s->gb, 8); /* JPEG Ss / lossless JPEG predictor /JPEG-LS NEAR */
1251  ilv = get_bits(&s->gb, 8); /* JPEG Se / JPEG-LS ILV */
1252  if(s->avctx->codec_tag != AV_RL32("CJPG")){
1253  prev_shift = get_bits(&s->gb, 4); /* Ah */
1254  point_transform = get_bits(&s->gb, 4); /* Al */
1255  }else
1256  prev_shift = point_transform = 0;
1257 
1258  if (nb_components > 1) {
1259  /* interleaved stream */
1260  s->mb_width = (s->width + s->h_max * block_size - 1) / (s->h_max * block_size);
1261  s->mb_height = (s->height + s->v_max * block_size - 1) / (s->v_max * block_size);
1262  } else if (!s->ls) { /* skip this for JPEG-LS */
1263  h = s->h_max / s->h_scount[0];
1264  v = s->v_max / s->v_scount[0];
1265  s->mb_width = (s->width + h * block_size - 1) / (h * block_size);
1266  s->mb_height = (s->height + v * block_size - 1) / (v * block_size);
1267  s->nb_blocks[0] = 1;
1268  s->h_scount[0] = 1;
1269  s->v_scount[0] = 1;
1270  }
1271 
1272  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1273  av_log(s->avctx, AV_LOG_DEBUG, "%s %s p:%d >>:%d ilv:%d bits:%d skip:%d %s comp:%d\n",
1274  s->lossless ? "lossless" : "sequential DCT", s->rgb ? "RGB" : "",
1275  predictor, point_transform, ilv, s->bits, s->mjpb_skiptosod,
1276  s->pegasus_rct ? "PRCT" : (s->rct ? "RCT" : ""), nb_components);
1277 
1278 
1279  /* mjpeg-b can have padding bytes between sos and image data, skip them */
1280  for (i = s->mjpb_skiptosod; i > 0; i--)
1281  skip_bits(&s->gb, 8);
1282 
1283 next_field:
1284  for (i = 0; i < nb_components; i++)
1285  s->last_dc[i] = 1024;
1286 
1287  if (s->lossless) {
1288  av_assert0(s->picture_ptr == &s->picture);
1289  if (CONFIG_JPEGLS_DECODER && s->ls) {
1290 // for () {
1291 // reset_ls_coding_parameters(s, 0);
1292 
1293  if ((ret = ff_jpegls_decode_picture(s, predictor,
1294  point_transform, ilv)) < 0)
1295  return ret;
1296  } else {
1297  if (s->rgb) {
1298  if ((ret = ljpeg_decode_rgb_scan(s, nb_components, predictor, point_transform)) < 0)
1299  return ret;
1300  } else {
1301  if ((ret = ljpeg_decode_yuv_scan(s, predictor,
1302  point_transform,
1303  nb_components)) < 0)
1304  return ret;
1305  }
1306  }
1307  } else {
1308  if (s->progressive && predictor) {
1309  av_assert0(s->picture_ptr == &s->picture);
1310  if ((ret = mjpeg_decode_scan_progressive_ac(s, predictor,
1311  ilv, prev_shift,
1312  point_transform)) < 0)
1313  return ret;
1314  } else {
1315  if ((ret = mjpeg_decode_scan(s, nb_components,
1316  prev_shift, point_transform,
1317  mb_bitmask, reference)) < 0)
1318  return ret;
1319  }
1320  }
1321 
1322  if (s->interlaced &&
1323  get_bits_left(&s->gb) > 32 &&
1324  show_bits(&s->gb, 8) == 0xFF) {
1325  GetBitContext bak = s->gb;
1326  align_get_bits(&bak);
1327  if (show_bits(&bak, 16) == 0xFFD1) {
1328  av_log(s->avctx, AV_LOG_DEBUG, "AVRn interlaced picture marker found\n");
1329  s->gb = bak;
1330  skip_bits(&s->gb, 16);
1331  s->bottom_field ^= 1;
1332 
1333  goto next_field;
1334  }
1335  }
1336 
1337  emms_c();
1338  return 0;
1339  out_of_range:
1340  av_log(s->avctx, AV_LOG_ERROR, "decode_sos: ac/dc index out of range\n");
1341  return AVERROR_INVALIDDATA;
1342 }
1343 
1344 static int mjpeg_decode_dri(MJpegDecodeContext *s)
1345 {
1346  if (get_bits(&s->gb, 16) != 4)
1347  return AVERROR_INVALIDDATA;
1348  s->restart_interval = get_bits(&s->gb, 16);
1349  s->restart_count = 0;
1350  av_log(s->avctx, AV_LOG_DEBUG, "restart interval: %d\n",
1351  s->restart_interval);
1352 
1353  return 0;
1354 }
1355 
1356 static int mjpeg_decode_app(MJpegDecodeContext *s)
1357 {
1358  int len, id, i;
1359 
1360  len = get_bits(&s->gb, 16);
1361  if (len < 5)
1362  return AVERROR_INVALIDDATA;
1363  if (8 * len > get_bits_left(&s->gb))
1364  return AVERROR_INVALIDDATA;
1365 
1366  id = get_bits_long(&s->gb, 32);
1367  len -= 6;
1368 
1369  if (s->avctx->debug & FF_DEBUG_STARTCODE)
1370  av_log(s->avctx, AV_LOG_DEBUG, "APPx %8X\n", id);
1371 
1372  /* Buggy AVID, it puts EOI only at every 10th frame. */
1373  /* Also, this fourcc is used by non-avid files too, it holds some
1374  information, but it's always present in AVID-created files. */
1375  if (id == AV_RB32("AVI1")) {
1376  /* structure:
1377  4bytes AVI1
1378  1bytes polarity
1379  1bytes always zero
1380  4bytes field_size
1381  4bytes field_size_less_padding
1382  */
1383  s->buggy_avid = 1;
1384  i = get_bits(&s->gb, 8); len--;
1385  av_log(s->avctx, AV_LOG_DEBUG, "polarity %d\n", i);
1386 #if 0
1387  skip_bits(&s->gb, 8);
1388  skip_bits(&s->gb, 32);
1389  skip_bits(&s->gb, 32);
1390  len -= 10;
1391 #endif
1392  goto out;
1393  }
1394 
1395 // len -= 2;
1396 
1397  if (id == AV_RB32("JFIF")) {
1398  int t_w, t_h, v1, v2;
1399  skip_bits(&s->gb, 8); /* the trailing zero-byte */
1400  v1 = get_bits(&s->gb, 8);
1401  v2 = get_bits(&s->gb, 8);
1402  skip_bits(&s->gb, 8);
1403 
1404  s->avctx->sample_aspect_ratio.num = get_bits(&s->gb, 16);
1405  s->avctx->sample_aspect_ratio.den = get_bits(&s->gb, 16);
1406 
1407  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1408  av_log(s->avctx, AV_LOG_INFO,
1409  "mjpeg: JFIF header found (version: %x.%x) SAR=%d/%d\n",
1410  v1, v2,
1411  s->avctx->sample_aspect_ratio.num,
1412  s->avctx->sample_aspect_ratio.den);
1413 
1414  t_w = get_bits(&s->gb, 8);
1415  t_h = get_bits(&s->gb, 8);
1416  if (t_w && t_h) {
1417  /* skip thumbnail */
1418  if (len -10 - (t_w * t_h * 3) > 0)
1419  len -= t_w * t_h * 3;
1420  }
1421  len -= 10;
1422  goto out;
1423  }
1424 
1425  if (id == AV_RB32("Adob") && (get_bits(&s->gb, 8) == 'e')) {
1426  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1427  av_log(s->avctx, AV_LOG_INFO, "mjpeg: Adobe header found\n");
1428  skip_bits(&s->gb, 16); /* version */
1429  skip_bits(&s->gb, 16); /* flags0 */
1430  skip_bits(&s->gb, 16); /* flags1 */
1431  skip_bits(&s->gb, 8); /* transform */
1432  len -= 7;
1433  goto out;
1434  }
1435 
1436  if (id == AV_RB32("LJIF")) {
1437  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1438  av_log(s->avctx, AV_LOG_INFO,
1439  "Pegasus lossless jpeg header found\n");
1440  skip_bits(&s->gb, 16); /* version ? */
1441  skip_bits(&s->gb, 16); /* unknown always 0? */
1442  skip_bits(&s->gb, 16); /* unknown always 0? */
1443  skip_bits(&s->gb, 16); /* unknown always 0? */
1444  switch (get_bits(&s->gb, 8)) {
1445  case 1:
1446  s->rgb = 1;
1447  s->pegasus_rct = 0;
1448  break;
1449  case 2:
1450  s->rgb = 1;
1451  s->pegasus_rct = 1;
1452  break;
1453  default:
1454  av_log(s->avctx, AV_LOG_ERROR, "unknown colorspace\n");
1455  }
1456  len -= 9;
1457  goto out;
1458  }
1459 
1460  /* Apple MJPEG-A */
1461  if ((s->start_code == APP1) && (len > (0x28 - 8))) {
1462  id = get_bits_long(&s->gb, 32);
1463  len -= 4;
1464  /* Apple MJPEG-A */
1465  if (id == AV_RB32("mjpg")) {
1466 #if 0
1467  skip_bits(&s->gb, 32); /* field size */
1468  skip_bits(&s->gb, 32); /* pad field size */
1469  skip_bits(&s->gb, 32); /* next off */
1470  skip_bits(&s->gb, 32); /* quant off */
1471  skip_bits(&s->gb, 32); /* huff off */
1472  skip_bits(&s->gb, 32); /* image off */
1473  skip_bits(&s->gb, 32); /* scan off */
1474  skip_bits(&s->gb, 32); /* data off */
1475 #endif
1476  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1477  av_log(s->avctx, AV_LOG_INFO, "mjpeg: Apple MJPEG-A header found\n");
1478  }
1479  }
1480 
1481 out:
1482  /* slow but needed for extreme adobe jpegs */
1483  if (len < 0)
1484  av_log(s->avctx, AV_LOG_ERROR,
1485  "mjpeg: error, decode_app parser read over the end\n");
1486  while (--len > 0)
1487  skip_bits(&s->gb, 8);
1488 
1489  return 0;
1490 }
1491 
1492 static int mjpeg_decode_com(MJpegDecodeContext *s)
1493 {
1494  int len = get_bits(&s->gb, 16);
1495  if (len >= 2 && 8 * len - 16 <= get_bits_left(&s->gb)) {
1496  char *cbuf = av_malloc(len - 1);
1497  if (cbuf) {
1498  int i;
1499  for (i = 0; i < len - 2; i++)
1500  cbuf[i] = get_bits(&s->gb, 8);
1501  if (i > 0 && cbuf[i - 1] == '\n')
1502  cbuf[i - 1] = 0;
1503  else
1504  cbuf[i] = 0;
1505 
1506  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1507  av_log(s->avctx, AV_LOG_INFO, "comment: '%s'\n", cbuf);
1508 
1509  /* buggy avid, it puts EOI only at every 10th frame */
1510  if (!strncmp(cbuf, "AVID", 4)) {
1511  s->buggy_avid = 1;
1512  if (len > 14 && cbuf[12] == 1) /* 1 - NTSC, 2 - PAL */
1513  s->interlace_polarity = 1;
1514  } else if (!strcmp(cbuf, "CS=ITU601"))
1515  s->cs_itu601 = 1;
1516  else if ((!strncmp(cbuf, "Intel(R) JPEG Library, version 1", 32)) ||
1517  (!strncmp(cbuf, "Metasoft MJPEG Codec", 20)))
1518  s->flipped = 1;
1519 
1520  av_free(cbuf);
1521  }
1522  }
1523 
1524  return 0;
1525 }
1526 
1527 /* return the 8 bit start code value and update the search
1528  state. Return -1 if no start code found */
1529 static int find_marker(const uint8_t **pbuf_ptr, const uint8_t *buf_end)
1530 {
1531  const uint8_t *buf_ptr;
1532  unsigned int v, v2;
1533  int val;
1534  int skipped = 0;
1535 
1536  buf_ptr = *pbuf_ptr;
1537  while (buf_ptr < buf_end) {
1538  v = *buf_ptr++;
1539  v2 = *buf_ptr;
1540  if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe) && buf_ptr < buf_end) {
1541  val = *buf_ptr++;
1542  goto found;
1543  }
1544  skipped++;
1545  }
1546  val = -1;
1547 found:
1548  av_dlog(NULL, "find_marker skipped %d bytes\n", skipped);
1549  *pbuf_ptr = buf_ptr;
1550  return val;
1551 }
1552 
1553 int ff_mjpeg_find_marker(MJpegDecodeContext *s,
1554  const uint8_t **buf_ptr, const uint8_t *buf_end,
1555  const uint8_t **unescaped_buf_ptr,
1556  int *unescaped_buf_size)
1557 {
1558  int start_code;
1559  start_code = find_marker(buf_ptr, buf_end);
1560 
1561  av_fast_padded_malloc(&s->buffer, &s->buffer_size, buf_end - *buf_ptr);
1562  if (!s->buffer)
1563  return AVERROR(ENOMEM);
1564 
1565  /* unescape buffer of SOS, use special treatment for JPEG-LS */
1566  if (start_code == SOS && !s->ls) {
1567  const uint8_t *src = *buf_ptr;
1568  uint8_t *dst = s->buffer;
1569 
1570  while (src < buf_end) {
1571  uint8_t x = *(src++);
1572 
1573  *(dst++) = x;
1574  if (s->avctx->codec_id != AV_CODEC_ID_THP) {
1575  if (x == 0xff) {
1576  while (src < buf_end && x == 0xff)
1577  x = *(src++);
1578 
1579  if (x >= 0xd0 && x <= 0xd7)
1580  *(dst++) = x;
1581  else if (x)
1582  break;
1583  }
1584  }
1585  }
1586  *unescaped_buf_ptr = s->buffer;
1587  *unescaped_buf_size = dst - s->buffer;
1588  memset(s->buffer + *unescaped_buf_size, 0,
1589  FF_INPUT_BUFFER_PADDING_SIZE);
1590 
1591  av_log(s->avctx, AV_LOG_DEBUG, "escaping removed %td bytes\n",
1592  (buf_end - *buf_ptr) - (dst - s->buffer));
1593  } else if (start_code == SOS && s->ls) {
1594  const uint8_t *src = *buf_ptr;
1595  uint8_t *dst = s->buffer;
1596  int bit_count = 0;
1597  int t = 0, b = 0;
1598  PutBitContext pb;
1599 
1600  s->cur_scan++;
1601 
1602  /* find marker */
1603  while (src + t < buf_end) {
1604  uint8_t x = src[t++];
1605  if (x == 0xff) {
1606  while ((src + t < buf_end) && x == 0xff)
1607  x = src[t++];
1608  if (x & 0x80) {
1609  t -= FFMIN(2, t);
1610  break;
1611  }
1612  }
1613  }
1614  bit_count = t * 8;
1615  init_put_bits(&pb, dst, t);
1616 
1617  /* unescape bitstream */
1618  while (b < t) {
1619  uint8_t x = src[b++];
1620  put_bits(&pb, 8, x);
1621  if (x == 0xFF) {
1622  x = src[b++];
1623  put_bits(&pb, 7, x);
1624  bit_count--;
1625  }
1626  }
1627  flush_put_bits(&pb);
1628 
1629  *unescaped_buf_ptr = dst;
1630  *unescaped_buf_size = (bit_count + 7) >> 3;
1631  memset(s->buffer + *unescaped_buf_size, 0,
1632  FF_INPUT_BUFFER_PADDING_SIZE);
1633  } else {
1634  *unescaped_buf_ptr = *buf_ptr;
1635  *unescaped_buf_size = buf_end - *buf_ptr;
1636  }
1637 
1638  return start_code;
1639 }
1640 
1641 int ff_mjpeg_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
1642  AVPacket *avpkt)
1643 {
1644  const uint8_t *buf = avpkt->data;
1645  int buf_size = avpkt->size;
1646  MJpegDecodeContext *s = avctx->priv_data;
1647  const uint8_t *buf_end, *buf_ptr;
1648  const uint8_t *unescaped_buf_ptr;
1649  int hshift, vshift;
1650  int unescaped_buf_size;
1651  int start_code;
1652  int i, index;
1653  int ret = 0;
1654 
1655  buf_ptr = buf;
1656  buf_end = buf + buf_size;
1657  while (buf_ptr < buf_end) {
1658  /* find start next marker */
1659  start_code = ff_mjpeg_find_marker(s, &buf_ptr, buf_end,
1660  &unescaped_buf_ptr,
1661  &unescaped_buf_size);
1662  /* EOF */
1663  if (start_code < 0) {
1664  goto the_end;
1665  } else if (unescaped_buf_size > (1U<<28)) {
1666  av_log(avctx, AV_LOG_ERROR, "MJPEG packet 0x%x too big (0x%x/0x%x), corrupt data?\n",
1667  start_code, unescaped_buf_size, buf_size);
1668  return AVERROR_INVALIDDATA;
1669  } else {
1670  av_log(avctx, AV_LOG_DEBUG, "marker=%x avail_size_in_buf=%td\n",
1671  start_code, buf_end - buf_ptr);
1672  if ((ret = init_get_bits8(&s->gb, unescaped_buf_ptr, unescaped_buf_size)) < 0) {
1673  av_log(avctx, AV_LOG_ERROR, "invalid buffer\n");
1674  goto fail;
1675  }
1676 
1677  s->start_code = start_code;
1678  if (s->avctx->debug & FF_DEBUG_STARTCODE)
1679  av_log(avctx, AV_LOG_DEBUG, "startcode: %X\n", start_code);
1680 
1681  /* process markers */
1682  if (start_code >= 0xd0 && start_code <= 0xd7)
1683  av_log(avctx, AV_LOG_DEBUG,
1684  "restart marker: %d\n", start_code & 0x0f);
1685  /* APP fields */
1686  else if (start_code >= APP0 && start_code <= APP15)
1687  mjpeg_decode_app(s);
1688  /* Comment */
1689  else if (start_code == COM)
1690  mjpeg_decode_com(s);
1691 
1692  ret = -1;
1693 
1694  if (!CONFIG_JPEGLS_DECODER &&
1695  (start_code == SOF48 || start_code == LSE)) {
1696  av_log(avctx, AV_LOG_ERROR, "JPEG-LS support not enabled.\n");
1697  return AVERROR(ENOSYS);
1698  }
1699 
1700  switch (start_code) {
1701  case SOI:
1702  s->restart_interval = 0;
1703  s->restart_count = 0;
1704  /* nothing to do on SOI */
1705  break;
1706  case DQT:
1707  ff_mjpeg_decode_dqt(s);
1708  break;
1709  case DHT:
1710  if ((ret = ff_mjpeg_decode_dht(s)) < 0) {
1711  av_log(avctx, AV_LOG_ERROR, "huffman table decode error\n");
1712  goto fail;
1713  }
1714  break;
1715  case SOF0:
1716  case SOF1:
1717  s->lossless = 0;
1718  s->ls = 0;
1719  s->progressive = 0;
1720  if ((ret = ff_mjpeg_decode_sof(s)) < 0)
1721  goto fail;
1722  break;
1723  case SOF2:
1724  s->lossless = 0;
1725  s->ls = 0;
1726  s->progressive = 1;
1727  if ((ret = ff_mjpeg_decode_sof(s)) < 0)
1728  goto fail;
1729  break;
1730  case SOF3:
1731  s->lossless = 1;
1732  s->ls = 0;
1733  s->progressive = 0;
1734  if ((ret = ff_mjpeg_decode_sof(s)) < 0)
1735  goto fail;
1736  break;
1737  case SOF48:
1738  s->lossless = 1;
1739  s->ls = 1;
1740  s->progressive = 0;
1741  if ((ret = ff_mjpeg_decode_sof(s)) < 0)
1742  goto fail;
1743  break;
1744  case LSE:
1745  if (!CONFIG_JPEGLS_DECODER ||
1746  (ret = ff_jpegls_decode_lse(s)) < 0)
1747  goto fail;
1748  break;
1749  case EOI:
1750 eoi_parser:
1751  s->cur_scan = 0;
1752  if (!s->got_picture) {
1753  av_log(avctx, AV_LOG_WARNING,
1754  "Found EOI before any SOF, ignoring\n");
1755  break;
1756  }
1757  if (s->interlaced) {
1758  s->bottom_field ^= 1;
1759  /* if not bottom field, do not output image yet */
1760  if (s->bottom_field == !s->interlace_polarity)
1761  break;
1762  }
1763  if ((ret = av_frame_ref(data, s->picture_ptr)) < 0)
1764  return ret;
1765  *got_frame = 1;
1766  s->got_picture = 0;
1767 
1768  if (!s->lossless) {
1769  int qp = FFMAX3(s->qscale[0],
1770  s->qscale[1],
1771  s->qscale[2]);
1772  int qpw = (s->width + 15) / 16;
1773  AVBufferRef *qp_table_buf = av_buffer_alloc(qpw);
1774  if (qp_table_buf) {
1775  memset(qp_table_buf->data, qp, qpw);
1776  av_frame_set_qp_table(data, qp_table_buf, 0, FF_QSCALE_TYPE_MPEG1);
1777  }
1778 
1779  if(avctx->debug & FF_DEBUG_QP)
1780  av_log(avctx, AV_LOG_DEBUG, "QP: %d\n", qp);
1781  }
1782 
1783  goto the_end;
1784  case SOS:
1785  if ((ret = ff_mjpeg_decode_sos(s, NULL, NULL)) < 0 &&
1786  (avctx->err_recognition & AV_EF_EXPLODE))
1787  goto fail;
1788  break;
1789  case DRI:
1790  mjpeg_decode_dri(s);
1791  break;
1792  case SOF5:
1793  case SOF6:
1794  case SOF7:
1795  case SOF9:
1796  case SOF10:
1797  case SOF11:
1798  case SOF13:
1799  case SOF14:
1800  case SOF15:
1801  case JPG:
1802  av_log(avctx, AV_LOG_ERROR,
1803  "mjpeg: unsupported coding type (%x)\n", start_code);
1804  break;
1805  }
1806 
1807  /* eof process start code */
1808  buf_ptr += (get_bits_count(&s->gb) + 7) / 8;
1809  av_log(avctx, AV_LOG_DEBUG,
1810  "marker parser used %d bytes (%d bits)\n",
1811  (get_bits_count(&s->gb) + 7) / 8, get_bits_count(&s->gb));
1812  }
1813  }
1814  if (s->got_picture) {
1815  av_log(avctx, AV_LOG_WARNING, "EOI missing, emulating\n");
1816  goto eoi_parser;
1817  }
1818  av_log(avctx, AV_LOG_FATAL, "No JPEG data found in image\n");
1819  return AVERROR_INVALIDDATA;
1820 fail:
1821  s->got_picture = 0;
1822  return ret;
1823 the_end:
1824  if (s->upscale_h) {
1825  uint8_t *line = s->picture_ptr->data[s->upscale_h];
1826  av_assert0(avctx->pix_fmt == AV_PIX_FMT_YUVJ444P ||
1827  avctx->pix_fmt == AV_PIX_FMT_YUV444P ||
1828  avctx->pix_fmt == AV_PIX_FMT_YUVJ440P ||
1829  avctx->pix_fmt == AV_PIX_FMT_YUV440P);
1830  for (i = 0; i < s->chroma_height; i++) {
1831  for (index = s->width - 1; index; index--)
1832  line[index] = (line[index / 2] + line[(index + 1) / 2]) >> 1;
1833  line += s->linesize[s->upscale_h];
1834  }
1835  }
1836  if (s->upscale_v) {
1837  uint8_t *dst = &((uint8_t *)s->picture_ptr->data[s->upscale_v])[(s->height - 1) * s->linesize[s->upscale_v]];
1838  int w;
1839  avcodec_get_chroma_sub_sample(s->avctx->pix_fmt, &hshift, &vshift);
1840  w = s->width >> hshift;
1841  av_assert0(avctx->pix_fmt == AV_PIX_FMT_YUVJ444P ||
1842  avctx->pix_fmt == AV_PIX_FMT_YUV444P ||
1843  avctx->pix_fmt == AV_PIX_FMT_YUVJ422P ||
1844  avctx->pix_fmt == AV_PIX_FMT_YUV422P);
1845  for (i = s->height - 1; i; i--) {
1846  uint8_t *src1 = &((uint8_t *)s->picture_ptr->data[s->upscale_v])[i / 2 * s->linesize[s->upscale_v]];
1847  uint8_t *src2 = &((uint8_t *)s->picture_ptr->data[s->upscale_v])[(i + 1) / 2 * s->linesize[s->upscale_v]];
1848  if (src1 == src2) {
1849  memcpy(dst, src1, w);
1850  } else {
1851  for (index = 0; index < w; index++)
1852  dst[index] = (src1[index] + src2[index]) >> 1;
1853  }
1854  dst -= s->linesize[s->upscale_v];
1855  }
1856  }
1857  if (s->flipped && (s->avctx->flags & CODEC_FLAG_EMU_EDGE)) {
1858  int j;
1859  avcodec_get_chroma_sub_sample(s->avctx->pix_fmt, &hshift, &vshift);
1860  for (index=0; index<4; index++) {
1861  uint8_t *dst = s->picture_ptr->data[index];
1862  int w = s->width;
1863  int h = s->height;
1864  if(index && index<3){
1865  w = FF_CEIL_RSHIFT(w, hshift);
1866  h = FF_CEIL_RSHIFT(h, vshift);
1867  }
1868  if(dst){
1869  uint8_t *dst2 = dst + s->linesize[index]*(h-1);
1870  for (i=0; i<h/2; i++) {
1871  for (j=0; j<w; j++)
1872  FFSWAP(int, dst[j], dst2[j]);
1873  dst += s->linesize[index];
1874  dst2 -= s->linesize[index];
1875  }
1876  }
1877  }
1878  }
1879 
1880  av_log(avctx, AV_LOG_DEBUG, "decode frame unused %td bytes\n",
1881  buf_end - buf_ptr);
1882 // return buf_end - buf_ptr;
1883  return buf_ptr - buf;
1884 }
1885 
1886 av_cold int ff_mjpeg_decode_end(AVCodecContext *avctx)
1887 {
1888  MJpegDecodeContext *s = avctx->priv_data;
1889  int i, j;
1890 
1891  if (s->picture_ptr)
1892  av_frame_unref(s->picture_ptr);
1893 
1894  av_free(s->buffer);
1895  av_freep(&s->ljpeg_buffer);
1896  s->ljpeg_buffer_size = 0;
1897 
1898  for (i = 0; i < 3; i++) {
1899  for (j = 0; j < 4; j++)
1900  ff_free_vlc(&s->vlcs[i][j]);
1901  }
1902  for (i = 0; i < MAX_COMPONENTS; i++) {
1903  av_freep(&s->blocks[i]);
1904  av_freep(&s->last_nnz[i]);
1905  }
1906  return 0;
1907 }
1908 
1909 static void decode_flush(AVCodecContext *avctx)
1910 {
1911  MJpegDecodeContext *s = avctx->priv_data;
1912  s->got_picture = 0;
1913 }
1914 
1915 #if CONFIG_MJPEG_DECODER
1916 #define OFFSET(x) offsetof(MJpegDecodeContext, x)
1917 #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
1918 static const AVOption options[] = {
1919  { "extern_huff", "Use external huffman table.",
1920  OFFSET(extern_huff), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VD },
1921  { NULL },
1922 };
1923 
1924 static const AVClass mjpegdec_class = {
1925  .class_name = "MJPEG decoder",
1926  .item_name = av_default_item_name,
1927  .option = options,
1928  .version = LIBAVUTIL_VERSION_INT,
1929 };
1930 
1931 AVCodec ff_mjpeg_decoder = {
1932  .name = "mjpeg",
1933  .type = AVMEDIA_TYPE_VIDEO,
1934  .id = AV_CODEC_ID_MJPEG,
1935  .priv_data_size = sizeof(MJpegDecodeContext),
1936  .init = ff_mjpeg_decode_init,
1937  .close = ff_mjpeg_decode_end,
1938  .decode = ff_mjpeg_decode_frame,
1939  .flush = decode_flush,
1940  .capabilities = CODEC_CAP_DR1,
1941  .max_lowres = 3,
1942  .long_name = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),
1943  .priv_class = &mjpegdec_class,
1944 };
1945 #endif
1946 #if CONFIG_THP_DECODER
1947 AVCodec ff_thp_decoder = {
1948  .name = "thp",
1949  .type = AVMEDIA_TYPE_VIDEO,
1950  .id = AV_CODEC_ID_THP,
1951  .priv_data_size = sizeof(MJpegDecodeContext),
1952  .init = ff_mjpeg_decode_init,
1953  .close = ff_mjpeg_decode_end,
1954  .decode = ff_mjpeg_decode_frame,
1955  .flush = decode_flush,
1956  .capabilities = CODEC_CAP_DR1,
1957  .max_lowres = 3,
1958  .long_name = NULL_IF_CONFIG_SMALL("Nintendo Gamecube THP video"),
1959 };
1960 #endif
Generated on Tue May 21 2013 19:20:54 for FFmpeg by   doxygen 1.8.2