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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 "dsputil.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_dsputil_init(&s->dsp, avctx);
93  ff_init_scantable(s->dsp.idct_permutation, &s->scantable, ff_zigzag_direct);
94  s->buffer_size = 0;
95  s->buffer = NULL;
96  s->start_code = -1;
97  s->first_picture = 1;
98  s->got_picture = 0;
99  s->org_height = avctx->coded_height;
100  avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
101 
102  build_basic_mjpeg_vlc(s);
103 
104  if (s->extern_huff) {
105  av_log(avctx, AV_LOG_INFO, "using external huffman table\n");
106  init_get_bits(&s->gb, avctx->extradata, avctx->extradata_size * 8);
107  if (ff_mjpeg_decode_dht(s)) {
108  av_log(avctx, AV_LOG_ERROR,
109  "error using external huffman table, switching back to internal\n");
110  build_basic_mjpeg_vlc(s);
111  }
112  }
113  if (avctx->field_order == AV_FIELD_BB) { /* quicktime icefloe 019 */
114  s->interlace_polarity = 1; /* bottom field first */
115  av_log(avctx, AV_LOG_DEBUG, "bottom field first\n");
116  }
117  if (avctx->codec->id == AV_CODEC_ID_AMV)
118  s->flipped = 1;
119 
120  return 0;
121 }
122 
123 
124 /* quantize tables */
125 int ff_mjpeg_decode_dqt(MJpegDecodeContext *s)
126 {
127  int len, index, i, j;
128 
129  len = get_bits(&s->gb, 16) - 2;
130 
131  while (len >= 65) {
132  int pr = get_bits(&s->gb, 4);
133  if (pr > 1) {
134  av_log(s->avctx, AV_LOG_ERROR, "dqt: invalid precision\n");
135  return AVERROR_INVALIDDATA;
136  }
137  index = get_bits(&s->gb, 4);
138  if (index >= 4)
139  return -1;
140  av_log(s->avctx, AV_LOG_DEBUG, "index=%d\n", index);
141  /* read quant table */
142  for (i = 0; i < 64; i++) {
143  j = s->scantable.permutated[i];
144  s->quant_matrixes[index][j] = get_bits(&s->gb, pr ? 16 : 8);
145  }
146 
147  // XXX FIXME finetune, and perhaps add dc too
148  s->qscale[index] = FFMAX(s->quant_matrixes[index][s->scantable.permutated[1]],
149  s->quant_matrixes[index][s->scantable.permutated[8]]) >> 1;
150  av_log(s->avctx, AV_LOG_DEBUG, "qscale[%d]: %d\n",
151  index, s->qscale[index]);
152  len -= 65;
153  }
154  return 0;
155 }
156 
157 /* decode huffman tables and build VLC decoders */
158 int ff_mjpeg_decode_dht(MJpegDecodeContext *s)
159 {
160  int len, index, i, class, n, v, code_max;
161  uint8_t bits_table[17];
162  uint8_t val_table[256];
163  int ret = 0;
164 
165  len = get_bits(&s->gb, 16) - 2;
166 
167  while (len > 0) {
168  if (len < 17)
169  return AVERROR_INVALIDDATA;
170  class = get_bits(&s->gb, 4);
171  if (class >= 2)
172  return AVERROR_INVALIDDATA;
173  index = get_bits(&s->gb, 4);
174  if (index >= 4)
175  return AVERROR_INVALIDDATA;
176  n = 0;
177  for (i = 1; i <= 16; i++) {
178  bits_table[i] = get_bits(&s->gb, 8);
179  n += bits_table[i];
180  }
181  len -= 17;
182  if (len < n || n > 256)
183  return AVERROR_INVALIDDATA;
184 
185  code_max = 0;
186  for (i = 0; i < n; i++) {
187  v = get_bits(&s->gb, 8);
188  if (v > code_max)
189  code_max = v;
190  val_table[i] = v;
191  }
192  len -= n;
193 
194  /* build VLC and flush previous vlc if present */
195  ff_free_vlc(&s->vlcs[class][index]);
196  av_log(s->avctx, AV_LOG_DEBUG, "class=%d index=%d nb_codes=%d\n",
197  class, index, code_max + 1);
198  if ((ret = build_vlc(&s->vlcs[class][index], bits_table, val_table,
199  code_max + 1, 0, class > 0)) < 0)
200  return ret;
201 
202  if (class > 0) {
203  ff_free_vlc(&s->vlcs[2][index]);
204  if ((ret = build_vlc(&s->vlcs[2][index], bits_table, val_table,
205  code_max + 1, 0, 0)) < 0)
206  return ret;
207  }
208  }
209  return 0;
210 }
211 
212 int ff_mjpeg_decode_sof(MJpegDecodeContext *s)
213 {
214  int len, nb_components, i, width, height, pix_fmt_id;
215  int h_count[MAX_COMPONENTS];
216  int v_count[MAX_COMPONENTS];
217 
218  s->cur_scan = 0;
219  s->upscale_h = s->upscale_v = 0;
220 
221  /* XXX: verify len field validity */
222  len = get_bits(&s->gb, 16);
223  s->bits = get_bits(&s->gb, 8);
224 
225  if (s->pegasus_rct)
226  s->bits = 9;
227  if (s->bits == 9 && !s->pegasus_rct)
228  s->rct = 1; // FIXME ugly
229 
230  if (s->bits != 8 && !s->lossless) {
231  av_log(s->avctx, AV_LOG_ERROR, "only 8 bits/component accepted\n");
232  return -1;
233  }
234 
235  if(s->lossless && s->avctx->lowres){
236  av_log(s->avctx, AV_LOG_ERROR, "lowres is not possible with lossless jpeg\n");
237  return -1;
238  }
239 
240  height = get_bits(&s->gb, 16);
241  width = get_bits(&s->gb, 16);
242 
243  // HACK for odd_height.mov
244  if (s->interlaced && s->width == width && s->height == height + 1)
245  height= s->height;
246 
247  av_log(s->avctx, AV_LOG_DEBUG, "sof0: picture: %dx%d\n", width, height);
248  if (av_image_check_size(width, height, 0, s->avctx))
249  return AVERROR_INVALIDDATA;
250 
251  nb_components = get_bits(&s->gb, 8);
252  if (nb_components <= 0 ||
253  nb_components > MAX_COMPONENTS)
254  return -1;
255  if (s->interlaced && (s->bottom_field == !s->interlace_polarity)) {
256  if (nb_components != s->nb_components) {
257  av_log(s->avctx, AV_LOG_ERROR, "nb_components changing in interlaced picture\n");
258  return AVERROR_INVALIDDATA;
259  }
260  }
261  if (s->ls && !(s->bits <= 8 || nb_components == 1)) {
262  av_log_missing_feature(s->avctx,
263  "For JPEG-LS anything except <= 8 bits/component"
264  " or 16-bit gray", 0);
265  return AVERROR_PATCHWELCOME;
266  }
267  s->nb_components = nb_components;
268  s->h_max = 1;
269  s->v_max = 1;
270  memset(h_count, 0, sizeof(h_count));
271  memset(v_count, 0, sizeof(v_count));
272  for (i = 0; i < nb_components; i++) {
273  /* component id */
274  s->component_id[i] = get_bits(&s->gb, 8) - 1;
275  h_count[i] = get_bits(&s->gb, 4);
276  v_count[i] = get_bits(&s->gb, 4);
277  /* compute hmax and vmax (only used in interleaved case) */
278  if (h_count[i] > s->h_max)
279  s->h_max = h_count[i];
280  if (v_count[i] > s->v_max)
281  s->v_max = v_count[i];
282  if (!h_count[i] || !v_count[i]) {
283  av_log(s->avctx, AV_LOG_ERROR, "h/v_count is 0\n");
284  return -1;
285  }
286  s->quant_index[i] = get_bits(&s->gb, 8);
287  if (s->quant_index[i] >= 4) {
288  av_log(s->avctx, AV_LOG_ERROR, "quant_index is invalid\n");
289  return AVERROR_INVALIDDATA;
290  }
291  av_log(s->avctx, AV_LOG_DEBUG, "component %d %d:%d id: %d quant:%d\n",
292  i, h_count[i], v_count[i],
293  s->component_id[i], s->quant_index[i]);
294  }
295 
296  if (s->ls && (s->h_max > 1 || s->v_max > 1)) {
297  av_log_missing_feature(s->avctx, "Subsampling in JPEG-LS", 0);
298  return AVERROR_PATCHWELCOME;
299  }
300 
301  if (s->v_max == 1 && s->h_max == 1 && s->lossless==1 && nb_components==3)
302  s->rgb = 1;
303 
304  /* if different size, realloc/alloc picture */
305  if ( width != s->width || height != s->height
306  || memcmp(s->h_count, h_count, sizeof(h_count[0])*nb_components)
307  || memcmp(s->v_count, v_count, sizeof(v_count[0])*nb_components)) {
308  av_freep(&s->qscale_table);
309 
310  s->width = width;
311  s->height = height;
312  memcpy(s->h_count, h_count, sizeof(h_count));
313  memcpy(s->v_count, v_count, sizeof(v_count));
314  s->interlaced = 0;
315  s->got_picture = 0;
316 
317  /* test interlaced mode */
318  if (s->first_picture &&
319  s->org_height != 0 &&
320  s->height < ((s->org_height * 3) / 4)) {
321  s->interlaced = 1;
322  s->bottom_field = s->interlace_polarity;
323  s->picture_ptr->interlaced_frame = 1;
324  s->picture_ptr->top_field_first = !s->interlace_polarity;
325  height *= 2;
326  }
327 
328  avcodec_set_dimensions(s->avctx, width, height);
329 
330  s->qscale_table = av_mallocz((s->width + 15) / 16);
331  s->first_picture = 0;
332  }
333 
334  if (s->interlaced && (s->bottom_field == !s->interlace_polarity)) {
335  if (s->progressive) {
336  av_log_ask_for_sample(s->avctx, "progressively coded interlaced pictures not supported\n");
337  return AVERROR_INVALIDDATA;
338  }
339  } else{
340  /* XXX: not complete test ! */
341  pix_fmt_id = (s->h_count[0] << 28) | (s->v_count[0] << 24) |
342  (s->h_count[1] << 20) | (s->v_count[1] << 16) |
343  (s->h_count[2] << 12) | (s->v_count[2] << 8) |
344  (s->h_count[3] << 4) | s->v_count[3];
345  av_log(s->avctx, AV_LOG_DEBUG, "pix fmt id %x\n", pix_fmt_id);
346  /* NOTE we do not allocate pictures large enough for the possible
347  * padding of h/v_count being 4 */
348  if (!(pix_fmt_id & 0xD0D0D0D0))
349  pix_fmt_id -= (pix_fmt_id & 0xF0F0F0F0) >> 1;
350  if (!(pix_fmt_id & 0x0D0D0D0D))
351  pix_fmt_id -= (pix_fmt_id & 0x0F0F0F0F) >> 1;
352 
353  switch (pix_fmt_id) {
354  case 0x11111100:
355  if (s->rgb)
356  s->avctx->pix_fmt = AV_PIX_FMT_BGR24;
357  else {
358  if (s->component_id[0] == 'Q' && s->component_id[1] == 'F' && s->component_id[2] == 'A') {
359  s->avctx->pix_fmt = AV_PIX_FMT_GBR24P;
360  } else {
361  s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV444P : AV_PIX_FMT_YUVJ444P;
362  s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
363  }
364  }
365  av_assert0(s->nb_components == 3);
366  break;
367  case 0x12121100:
368  case 0x22122100:
369  s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV444P : AV_PIX_FMT_YUVJ444P;
370  s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
371  s->upscale_v = 2;
372  s->upscale_h = (pix_fmt_id == 0x22122100);
373  s->chroma_height = s->height;
374  break;
375  case 0x21211100:
376  case 0x22211200:
377  s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV444P : AV_PIX_FMT_YUVJ444P;
378  s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
379  s->upscale_v = (pix_fmt_id == 0x22211200);
380  s->upscale_h = 2;
381  s->chroma_height = s->height;
382  break;
383  case 0x22221100:
384  s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV444P : AV_PIX_FMT_YUVJ444P;
385  s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
386  s->upscale_v = 2;
387  s->upscale_h = 2;
388  s->chroma_height = s->height / 2;
389  break;
390  case 0x11000000:
391  case 0x13000000:
392  case 0x14000000:
393  case 0x31000000:
394  case 0x33000000:
395  case 0x34000000:
396  case 0x41000000:
397  case 0x43000000:
398  case 0x44000000:
399  if(s->bits <= 8)
400  s->avctx->pix_fmt = AV_PIX_FMT_GRAY8;
401  else
402  s->avctx->pix_fmt = AV_PIX_FMT_GRAY16;
403  break;
404  case 0x12111100:
405  case 0x22211100:
406  case 0x22112100:
407  s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV440P : AV_PIX_FMT_YUVJ440P;
408  s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
409  s->upscale_h = (pix_fmt_id == 0x22211100) * 2 + (pix_fmt_id == 0x22112100);
410  s->chroma_height = s->height / 2;
411  break;
412  case 0x21111100:
413  s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV422P : AV_PIX_FMT_YUVJ422P;
414  s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
415  break;
416  case 0x22121100:
417  case 0x22111200:
418  s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV422P : AV_PIX_FMT_YUVJ422P;
419  s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
420  s->upscale_v = (pix_fmt_id == 0x22121100) + 1;
421  break;
422  case 0x22111100:
423  s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV420P : AV_PIX_FMT_YUVJ420P;
424  s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
425  break;
426  default:
427  av_log(s->avctx, AV_LOG_ERROR, "Unhandled pixel format 0x%x\n", pix_fmt_id);
428  return AVERROR_PATCHWELCOME;
429  }
430  if ((s->upscale_h || s->upscale_v) && s->avctx->lowres) {
431  av_log(s->avctx, AV_LOG_ERROR, "lowres not supported for weird subsampling\n");
432  return AVERROR_PATCHWELCOME;
433  }
434  if (s->ls) {
435  s->upscale_h = s->upscale_v = 0;
436  if (s->nb_components > 1)
437  s->avctx->pix_fmt = AV_PIX_FMT_RGB24;
438  else if (s->bits <= 8)
439  s->avctx->pix_fmt = AV_PIX_FMT_GRAY8;
440  else
441  s->avctx->pix_fmt = AV_PIX_FMT_GRAY16;
442  }
443 
444  if (s->picture_ptr->data[0])
445  s->avctx->release_buffer(s->avctx, s->picture_ptr);
446 
447  if (ff_get_buffer(s->avctx, s->picture_ptr) < 0) {
448  av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
449  return -1;
450  }
451  s->picture_ptr->pict_type = AV_PICTURE_TYPE_I;
452  s->picture_ptr->key_frame = 1;
453  s->got_picture = 1;
454 
455  for (i = 0; i < 3; i++)
456  s->linesize[i] = s->picture_ptr->linesize[i] << s->interlaced;
457 
458  av_dlog(s->avctx, "%d %d %d %d %d %d\n",
459  s->width, s->height, s->linesize[0], s->linesize[1],
460  s->interlaced, s->avctx->height);
461 
462  if (len != (8 + (3 * nb_components)))
463  av_log(s->avctx, AV_LOG_DEBUG, "decode_sof0: error, len(%d) mismatch\n", len);
464  }
465 
466  /* totally blank picture as progressive JPEG will only add details to it */
467  if (s->progressive) {
468  int bw = (width + s->h_max * 8 - 1) / (s->h_max * 8);
469  int bh = (height + s->v_max * 8 - 1) / (s->v_max * 8);
470  for (i = 0; i < s->nb_components; i++) {
471  int size = bw * bh * s->h_count[i] * s->v_count[i];
472  av_freep(&s->blocks[i]);
473  av_freep(&s->last_nnz[i]);
474  s->blocks[i] = av_malloc(size * sizeof(**s->blocks));
475  s->last_nnz[i] = av_mallocz(size * sizeof(**s->last_nnz));
476  s->block_stride[i] = bw * s->h_count[i];
477  }
478  memset(s->coefs_finished, 0, sizeof(s->coefs_finished));
479  }
480  return 0;
481 }
482 
483 static inline int mjpeg_decode_dc(MJpegDecodeContext *s, int dc_index)
484 {
485  int code;
486  code = get_vlc2(&s->gb, s->vlcs[0][dc_index].table, 9, 2);
487  if (code < 0) {
488  av_log(s->avctx, AV_LOG_WARNING,
489  "mjpeg_decode_dc: bad vlc: %d:%d (%p)\n",
490  0, dc_index, &s->vlcs[0][dc_index]);
491  return 0xffff;
492  }
493 
494  if (code)
495  return get_xbits(&s->gb, code);
496  else
497  return 0;
498 }
499 
500 /* decode block and dequantize */
501 static int decode_block(MJpegDecodeContext *s, DCTELEM *block, int component,
502  int dc_index, int ac_index, int16_t *quant_matrix)
503 {
504  int code, i, j, level, val;
505 
506  /* DC coef */
507  val = mjpeg_decode_dc(s, dc_index);
508  if (val == 0xffff) {
509  av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
510  return AVERROR_INVALIDDATA;
511  }
512  val = val * quant_matrix[0] + s->last_dc[component];
513  s->last_dc[component] = val;
514  block[0] = val;
515  /* AC coefs */
516  i = 0;
517  {OPEN_READER(re, &s->gb);
518  do {
519  UPDATE_CACHE(re, &s->gb);
520  GET_VLC(code, re, &s->gb, s->vlcs[1][ac_index].table, 9, 2);
521 
522  i += ((unsigned)code) >> 4;
523  code &= 0xf;
524  if (code) {
525  if (code > MIN_CACHE_BITS - 16)
526  UPDATE_CACHE(re, &s->gb);
527 
528  {
529  int cache = GET_CACHE(re, &s->gb);
530  int sign = (~cache) >> 31;
531  level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
532  }
533 
534  LAST_SKIP_BITS(re, &s->gb, code);
535 
536  if (i > 63) {
537  av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
538  return AVERROR_INVALIDDATA;
539  }
540  j = s->scantable.permutated[i];
541  block[j] = level * quant_matrix[j];
542  }
543  } while (i < 63);
544  CLOSE_READER(re, &s->gb);}
545 
546  return 0;
547 }
548 
549 static int decode_dc_progressive(MJpegDecodeContext *s, DCTELEM *block,
550  int component, int dc_index,
551  int16_t *quant_matrix, int Al)
552 {
553  int val;
554  s->dsp.clear_block(block);
555  val = mjpeg_decode_dc(s, dc_index);
556  if (val == 0xffff) {
557  av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
558  return AVERROR_INVALIDDATA;
559  }
560  val = (val * quant_matrix[0] << Al) + s->last_dc[component];
561  s->last_dc[component] = val;
562  block[0] = val;
563  return 0;
564 }
565 
566 /* decode block and dequantize - progressive JPEG version */
567 static int decode_block_progressive(MJpegDecodeContext *s, DCTELEM *block,
568  uint8_t *last_nnz, int ac_index,
569  int16_t *quant_matrix,
570  int ss, int se, int Al, int *EOBRUN)
571 {
572  int code, i, j, level, val, run;
573 
574  if (*EOBRUN) {
575  (*EOBRUN)--;
576  return 0;
577  }
578 
579  {
580  OPEN_READER(re, &s->gb);
581  for (i = ss; ; i++) {
582  UPDATE_CACHE(re, &s->gb);
583  GET_VLC(code, re, &s->gb, s->vlcs[2][ac_index].table, 9, 2);
584 
585  run = ((unsigned) code) >> 4;
586  code &= 0xF;
587  if (code) {
588  i += run;
589  if (code > MIN_CACHE_BITS - 16)
590  UPDATE_CACHE(re, &s->gb);
591 
592  {
593  int cache = GET_CACHE(re, &s->gb);
594  int sign = (~cache) >> 31;
595  level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
596  }
597 
598  LAST_SKIP_BITS(re, &s->gb, code);
599 
600  if (i >= se) {
601  if (i == se) {
602  j = s->scantable.permutated[se];
603  block[j] = level * quant_matrix[j] << Al;
604  break;
605  }
606  av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
607  return AVERROR_INVALIDDATA;
608  }
609  j = s->scantable.permutated[i];
610  block[j] = level * quant_matrix[j] << Al;
611  } else {
612  if (run == 0xF) {// ZRL - skip 15 coefficients
613  i += 15;
614  if (i >= se) {
615  av_log(s->avctx, AV_LOG_ERROR, "ZRL overflow: %d\n", i);
616  return AVERROR_INVALIDDATA;
617  }
618  } else {
619  val = (1 << run);
620  if (run) {
621  UPDATE_CACHE(re, &s->gb);
622  val += NEG_USR32(GET_CACHE(re, &s->gb), run);
623  LAST_SKIP_BITS(re, &s->gb, run);
624  }
625  *EOBRUN = val - 1;
626  break;
627  }
628  }
629  }
630  CLOSE_READER(re, &s->gb);
631  }
632 
633  if (i > *last_nnz)
634  *last_nnz = i;
635 
636  return 0;
637 }
638 
639 #define REFINE_BIT(j) { \
640  UPDATE_CACHE(re, &s->gb); \
641  sign = block[j] >> 15; \
642  block[j] += SHOW_UBITS(re, &s->gb, 1) * \
643  ((quant_matrix[j] ^ sign) - sign) << Al; \
644  LAST_SKIP_BITS(re, &s->gb, 1); \
645 }
646 
647 #define ZERO_RUN \
648 for (; ; i++) { \
649  if (i > last) { \
650  i += run; \
651  if (i > se) { \
652  av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i); \
653  return -1; \
654  } \
655  break; \
656  } \
657  j = s->scantable.permutated[i]; \
658  if (block[j]) \
659  REFINE_BIT(j) \
660  else if (run-- == 0) \
661  break; \
662 }
663 
664 /* decode block and dequantize - progressive JPEG refinement pass */
665 static int decode_block_refinement(MJpegDecodeContext *s, DCTELEM *block,
666  uint8_t *last_nnz,
667  int ac_index, int16_t *quant_matrix,
668  int ss, int se, int Al, int *EOBRUN)
669 {
670  int code, i = ss, j, sign, val, run;
671  int last = FFMIN(se, *last_nnz);
672 
673  OPEN_READER(re, &s->gb);
674  if (*EOBRUN) {
675  (*EOBRUN)--;
676  } else {
677  for (; ; i++) {
678  UPDATE_CACHE(re, &s->gb);
679  GET_VLC(code, re, &s->gb, s->vlcs[2][ac_index].table, 9, 2);
680 
681  if (code & 0xF) {
682  run = ((unsigned) code) >> 4;
683  UPDATE_CACHE(re, &s->gb);
684  val = SHOW_UBITS(re, &s->gb, 1);
685  LAST_SKIP_BITS(re, &s->gb, 1);
686  ZERO_RUN;
687  j = s->scantable.permutated[i];
688  val--;
689  block[j] = ((quant_matrix[j]^val) - val) << Al;
690  if (i == se) {
691  if (i > *last_nnz)
692  *last_nnz = i;
693  CLOSE_READER(re, &s->gb);
694  return 0;
695  }
696  } else {
697  run = ((unsigned) code) >> 4;
698  if (run == 0xF) {
699  ZERO_RUN;
700  } else {
701  val = run;
702  run = (1 << run);
703  if (val) {
704  UPDATE_CACHE(re, &s->gb);
705  run += SHOW_UBITS(re, &s->gb, val);
706  LAST_SKIP_BITS(re, &s->gb, val);
707  }
708  *EOBRUN = run - 1;
709  break;
710  }
711  }
712  }
713 
714  if (i > *last_nnz)
715  *last_nnz = i;
716  }
717 
718  for (; i <= last; i++) {
719  j = s->scantable.permutated[i];
720  if (block[j])
721  REFINE_BIT(j)
722  }
723  CLOSE_READER(re, &s->gb);
724 
725  return 0;
726 }
727 #undef REFINE_BIT
728 #undef ZERO_RUN
729 
730 static void handle_rstn(MJpegDecodeContext *s, int nb_components)
731 {
732  int i;
733  if (s->restart_interval) {
734  s->restart_count--;
735  if(s->restart_count == 0 && s->avctx->codec_id == AV_CODEC_ID_THP){
736  align_get_bits(&s->gb);
737  for (i = 0; i < nb_components; i++) /* reset dc */
738  s->last_dc[i] = 1024;
739  }
740 
741  i = 8 + ((-get_bits_count(&s->gb)) & 7);
742  /* skip RSTn */
743  if (s->restart_count == 0) {
744  if( show_bits(&s->gb, i) == (1 << i) - 1
745  || show_bits(&s->gb, i) == 0xFF) {
746  int pos = get_bits_count(&s->gb);
747  align_get_bits(&s->gb);
748  while (get_bits_left(&s->gb) >= 8 && show_bits(&s->gb, 8) == 0xFF)
749  skip_bits(&s->gb, 8);
750  if (get_bits_left(&s->gb) >= 8 && (get_bits(&s->gb, 8) & 0xF8) == 0xD0) {
751  for (i = 0; i < nb_components; i++) /* reset dc */
752  s->last_dc[i] = 1024;
753  } else
754  skip_bits_long(&s->gb, pos - get_bits_count(&s->gb));
755  }
756  }
757  }
758 }
759 
760 static int ljpeg_decode_rgb_scan(MJpegDecodeContext *s, int nb_components, int predictor, int point_transform)
761 {
762  int i, mb_x, mb_y;
763  uint16_t (*buffer)[4];
764  int left[3], top[3], topleft[3];
765  const int linesize = s->linesize[0];
766  const int mask = (1 << s->bits) - 1;
767  int resync_mb_y = 0;
768  int resync_mb_x = 0;
769 
770  s->restart_count = s->restart_interval;
771 
772  av_fast_malloc(&s->ljpeg_buffer, &s->ljpeg_buffer_size,
773  (unsigned)s->mb_width * 4 * sizeof(s->ljpeg_buffer[0][0]));
774  buffer = s->ljpeg_buffer;
775 
776  for (i = 0; i < 3; i++)
777  buffer[0][i] = 1 << (s->bits - 1);
778 
779  for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
780  uint8_t *ptr = s->picture.data[0] + (linesize * mb_y);
781 
782  if (s->interlaced && s->bottom_field)
783  ptr += linesize >> 1;
784 
785  for (i = 0; i < 3; i++)
786  top[i] = left[i] = topleft[i] = buffer[0][i];
787 
788  for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
789  int modified_predictor = predictor;
790 
791  if (s->restart_interval && !s->restart_count){
792  s->restart_count = s->restart_interval;
793  resync_mb_x = mb_x;
794  resync_mb_y = mb_y;
795  for(i=0; i<3; i++)
796  top[i] = left[i]= topleft[i]= 1 << (s->bits - 1);
797  }
798  if (mb_y == resync_mb_y || mb_y == resync_mb_y+1 && mb_x < resync_mb_x || !mb_x)
799  modified_predictor = 1;
800 
801  for (i=0;i<nb_components;i++) {
802  int pred, dc;
803 
804  topleft[i] = top[i];
805  top[i] = buffer[mb_x][i];
806 
807  PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
808 
809  dc = mjpeg_decode_dc(s, s->dc_index[i]);
810  if(dc == 0xFFFF)
811  return -1;
812 
813  left[i] = buffer[mb_x][i] =
814  mask & (pred + (dc << point_transform));
815  }
816 
817  if (s->restart_interval && !--s->restart_count) {
818  align_get_bits(&s->gb);
819  skip_bits(&s->gb, 16); /* skip RSTn */
820  }
821  }
822 
823  if (s->rct) {
824  for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
825  ptr[3*mb_x + 1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2] - 0x200) >> 2);
826  ptr[3*mb_x + 0] = buffer[mb_x][1] + ptr[3*mb_x + 1];
827  ptr[3*mb_x + 2] = buffer[mb_x][2] + ptr[3*mb_x + 1];
828  }
829  } else if (s->pegasus_rct) {
830  for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
831  ptr[3*mb_x + 1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2]) >> 2);
832  ptr[3*mb_x + 0] = buffer[mb_x][1] + ptr[3*mb_x + 1];
833  ptr[3*mb_x + 2] = buffer[mb_x][2] + ptr[3*mb_x + 1];
834  }
835  } else {
836  for(i=0; i<nb_components; i++) {
837  int c= s->comp_index[i];
838  for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
839  ptr[3*mb_x+2-c] = buffer[mb_x][i];
840  }
841  }
842  }
843  }
844  return 0;
845 }
846 
847 static int ljpeg_decode_yuv_scan(MJpegDecodeContext *s, int predictor,
848  int point_transform)
849 {
850  int i, mb_x, mb_y;
851  const int nb_components=s->nb_components;
852  int bits= (s->bits+7)&~7;
853  int resync_mb_y = 0;
854  int resync_mb_x = 0;
855 
856  point_transform += bits - s->bits;
857 
858  av_assert0(nb_components==1 || nb_components==3);
859 
860  for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
861  for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
862  if (s->restart_interval && !s->restart_count){
863  s->restart_count = s->restart_interval;
864  resync_mb_x = mb_x;
865  resync_mb_y = mb_y;
866  }
867 
868  if(!mb_x || mb_y == resync_mb_y || mb_y == resync_mb_y+1 && mb_x < resync_mb_x || s->interlaced){
869  int toprow = mb_y == resync_mb_y || mb_y == resync_mb_y+1 && mb_x < resync_mb_x;
870  int leftcol = !mb_x || mb_y == resync_mb_y && mb_x == resync_mb_x;
871  for (i = 0; i < nb_components; i++) {
872  uint8_t *ptr;
873  uint16_t *ptr16;
874  int n, h, v, x, y, c, j, linesize;
875  n = s->nb_blocks[i];
876  c = s->comp_index[i];
877  h = s->h_scount[i];
878  v = s->v_scount[i];
879  x = 0;
880  y = 0;
881  linesize= s->linesize[c];
882 
883  if(bits>8) linesize /= 2;
884 
885  for(j=0; j<n; j++) {
886  int pred, dc;
887 
888  dc = mjpeg_decode_dc(s, s->dc_index[i]);
889  if(dc == 0xFFFF)
890  return -1;
891  if(bits<=8){
892  ptr = s->picture.data[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
893  if(y==0 && toprow){
894  if(x==0 && leftcol){
895  pred= 1 << (bits - 1);
896  }else{
897  pred= ptr[-1];
898  }
899  }else{
900  if(x==0 && leftcol){
901  pred= ptr[-linesize];
902  }else{
903  PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
904  }
905  }
906 
907  if (s->interlaced && s->bottom_field)
908  ptr += linesize >> 1;
909  pred &= (-1)<<(8-s->bits);
910  *ptr= pred + (dc << point_transform);
911  }else{
912  ptr16 = (uint16_t*)(s->picture.data[c] + 2*(linesize * (v * mb_y + y)) + 2*(h * mb_x + x)); //FIXME optimize this crap
913  if(y==0 && toprow){
914  if(x==0 && leftcol){
915  pred= 1 << (bits - 1);
916  }else{
917  pred= ptr16[-1];
918  }
919  }else{
920  if(x==0 && leftcol){
921  pred= ptr16[-linesize];
922  }else{
923  PREDICT(pred, ptr16[-linesize-1], ptr16[-linesize], ptr16[-1], predictor);
924  }
925  }
926 
927  if (s->interlaced && s->bottom_field)
928  ptr16 += linesize >> 1;
929  pred &= (-1)<<(16-s->bits);
930  *ptr16= pred + (dc << point_transform);
931  }
932  if (++x == h) {
933  x = 0;
934  y++;
935  }
936  }
937  }
938  } else {
939  for (i = 0; i < nb_components; i++) {
940  uint8_t *ptr;
941  uint16_t *ptr16;
942  int n, h, v, x, y, c, j, linesize, dc;
943  n = s->nb_blocks[i];
944  c = s->comp_index[i];
945  h = s->h_scount[i];
946  v = s->v_scount[i];
947  x = 0;
948  y = 0;
949  linesize = s->linesize[c];
950 
951  if(bits>8) linesize /= 2;
952 
953  for (j = 0; j < n; j++) {
954  int pred;
955 
956  dc = mjpeg_decode_dc(s, s->dc_index[i]);
957  if(dc == 0xFFFF)
958  return -1;
959  if(bits<=8){
960  ptr = s->picture.data[c] +
961  (linesize * (v * mb_y + y)) +
962  (h * mb_x + x); //FIXME optimize this crap
963  PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
964 
965  pred &= (-1)<<(8-s->bits);
966  *ptr = pred + (dc << point_transform);
967  }else{
968  ptr16 = (uint16_t*)(s->picture.data[c] + 2*(linesize * (v * mb_y + y)) + 2*(h * mb_x + x)); //FIXME optimize this crap
969  PREDICT(pred, ptr16[-linesize-1], ptr16[-linesize], ptr16[-1], predictor);
970 
971  pred &= (-1)<<(16-s->bits);
972  *ptr16= pred + (dc << point_transform);
973  }
974 
975  if (++x == h) {
976  x = 0;
977  y++;
978  }
979  }
980  }
981  }
982  if (s->restart_interval && !--s->restart_count) {
983  align_get_bits(&s->gb);
984  skip_bits(&s->gb, 16); /* skip RSTn */
985  }
986  }
987  }
988  return 0;
989 }
990 
991 static av_always_inline void mjpeg_copy_block(uint8_t *dst, const uint8_t *src,
992  int linesize, int lowres)
993 {
994  switch (lowres) {
995  case 0: copy_block8(dst, src, linesize, linesize, 8);
996  break;
997  case 1: copy_block4(dst, src, linesize, linesize, 4);
998  break;
999  case 2: copy_block2(dst, src, linesize, linesize, 2);
1000  break;
1001  case 3: *dst = *src;
1002  break;
1003  }
1004 }
1005 
1006 static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int Ah,
1007  int Al, const uint8_t *mb_bitmask,
1008  const AVFrame *reference)
1009 {
1010  int i, mb_x, mb_y;
1011  uint8_t *data[MAX_COMPONENTS];
1012  const uint8_t *reference_data[MAX_COMPONENTS];
1013  int linesize[MAX_COMPONENTS];
1014  GetBitContext mb_bitmask_gb;
1015 
1016  if (mb_bitmask)
1017  init_get_bits(&mb_bitmask_gb, mb_bitmask, s->mb_width * s->mb_height);
1018 
1019  if (s->flipped && s->avctx->lowres) {
1020  av_log(s->avctx, AV_LOG_ERROR, "Can not flip image with lowres\n");
1021  s->flipped = 0;
1022  }
1023 
1024  for (i = 0; i < nb_components; i++) {
1025  int c = s->comp_index[i];
1026  data[c] = s->picture_ptr->data[c];
1027  reference_data[c] = reference ? reference->data[c] : NULL;
1028  linesize[c] = s->linesize[c];
1029  s->coefs_finished[c] |= 1;
1030  if (s->flipped && !(s->avctx->flags & CODEC_FLAG_EMU_EDGE)) {
1031  // picture should be flipped upside-down for this codec
1032  int offset = (linesize[c] * (s->v_scount[i] *
1033  (8 * s->mb_height - ((s->height / s->v_max) & 7)) - 1));
1034  data[c] += offset;
1035  reference_data[c] += offset;
1036  linesize[c] *= -1;
1037  }
1038  }
1039 
1040  for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
1041  for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
1042  const int copy_mb = mb_bitmask && !get_bits1(&mb_bitmask_gb);
1043 
1044  if (s->restart_interval && !s->restart_count)
1045  s->restart_count = s->restart_interval;
1046 
1047  if (get_bits_left(&s->gb) < 0) {
1048  av_log(s->avctx, AV_LOG_ERROR, "overread %d\n",
1049  -get_bits_left(&s->gb));
1050  return AVERROR_INVALIDDATA;
1051  }
1052  for (i = 0; i < nb_components; i++) {
1053  uint8_t *ptr;
1054  int n, h, v, x, y, c, j;
1055  int block_offset;
1056  n = s->nb_blocks[i];
1057  c = s->comp_index[i];
1058  h = s->h_scount[i];
1059  v = s->v_scount[i];
1060  x = 0;
1061  y = 0;
1062  for (j = 0; j < n; j++) {
1063  block_offset = (((linesize[c] * (v * mb_y + y) * 8) +
1064  (h * mb_x + x) * 8) >> s->avctx->lowres);
1065 
1066  if (s->interlaced && s->bottom_field)
1067  block_offset += linesize[c] >> 1;
1068  ptr = data[c] + block_offset;
1069  if (!s->progressive) {
1070  if (copy_mb)
1071  mjpeg_copy_block(ptr, reference_data[c] + block_offset,
1072  linesize[c], s->avctx->lowres);
1073  else {
1074  s->dsp.clear_block(s->block);
1075  if (decode_block(s, s->block, i,
1076  s->dc_index[i], s->ac_index[i],
1077  s->quant_matrixes[s->quant_index[c]]) < 0) {
1078  av_log(s->avctx, AV_LOG_ERROR,
1079  "error y=%d x=%d\n", mb_y, mb_x);
1080  return AVERROR_INVALIDDATA;
1081  }
1082  s->dsp.idct_put(ptr, linesize[c], s->block);
1083  }
1084  } else {
1085  int block_idx = s->block_stride[c] * (v * mb_y + y) +
1086  (h * mb_x + x);
1087  DCTELEM *block = s->blocks[c][block_idx];
1088  if (Ah)
1089  block[0] += get_bits1(&s->gb) *
1090  s->quant_matrixes[s->quant_index[c]][0] << Al;
1091  else if (decode_dc_progressive(s, block, i, s->dc_index[i],
1092  s->quant_matrixes[s->quant_index[c]],
1093  Al) < 0) {
1094  av_log(s->avctx, AV_LOG_ERROR,
1095  "error y=%d x=%d\n", mb_y, mb_x);
1096  return AVERROR_INVALIDDATA;
1097  }
1098  }
1099  av_dlog(s->avctx, "mb: %d %d processed\n", mb_y, mb_x);
1100  av_dlog(s->avctx, "%d %d %d %d %d %d %d %d \n",
1101  mb_x, mb_y, x, y, c, s->bottom_field,
1102  (v * mb_y + y) * 8, (h * mb_x + x) * 8);
1103  if (++x == h) {
1104  x = 0;
1105  y++;
1106  }
1107  }
1108  }
1109 
1110  handle_rstn(s, nb_components);
1111  }
1112  }
1113  return 0;
1114 }
1115 
1116 static int mjpeg_decode_scan_progressive_ac(MJpegDecodeContext *s, int ss,
1117  int se, int Ah, int Al)
1118 {
1119  int mb_x, mb_y;
1120  int EOBRUN = 0;
1121  int c = s->comp_index[0];
1122  uint8_t *data = s->picture.data[c];
1123  int linesize = s->linesize[c];
1124  int last_scan = 0;
1125  int16_t *quant_matrix = s->quant_matrixes[s->quant_index[c]];
1126 
1127  if (se > 63) {
1128  av_log(s->avctx, AV_LOG_ERROR, "SE %d is too large\n", se);
1129  return AVERROR_INVALIDDATA;
1130  }
1131 
1132  if (!Al) {
1133  s->coefs_finished[c] |= (1LL << (se + 1)) - (1LL << ss);
1134  last_scan = !~s->coefs_finished[c];
1135  }
1136 
1137  if (s->interlaced && s->bottom_field)
1138  data += linesize >> 1;
1139 
1140  s->restart_count = 0;
1141 
1142  for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
1143  uint8_t *ptr = data + (mb_y * linesize * 8 >> s->avctx->lowres);
1144  int block_idx = mb_y * s->block_stride[c];
1145  DCTELEM (*block)[64] = &s->blocks[c][block_idx];
1146  uint8_t *last_nnz = &s->last_nnz[c][block_idx];
1147  for (mb_x = 0; mb_x < s->mb_width; mb_x++, block++, last_nnz++) {
1148  int ret;
1149  if (s->restart_interval && !s->restart_count)
1150  s->restart_count = s->restart_interval;
1151 
1152  if (Ah)
1153  ret = decode_block_refinement(s, *block, last_nnz, s->ac_index[0],
1154  quant_matrix, ss, se, Al, &EOBRUN);
1155  else
1156  ret = decode_block_progressive(s, *block, last_nnz, s->ac_index[0],
1157  quant_matrix, ss, se, Al, &EOBRUN);
1158  if (ret < 0) {
1159  av_log(s->avctx, AV_LOG_ERROR,
1160  "error y=%d x=%d\n", mb_y, mb_x);
1161  return AVERROR_INVALIDDATA;
1162  }
1163 
1164  if (last_scan) {
1165  s->dsp.idct_put(ptr, linesize, *block);
1166  ptr += 8 >> s->avctx->lowres;
1167  }
1168  handle_rstn(s, 0);
1169  }
1170  }
1171  return 0;
1172 }
1173 
1174 int ff_mjpeg_decode_sos(MJpegDecodeContext *s, const uint8_t *mb_bitmask,
1175  const AVFrame *reference)
1176 {
1177  int len, nb_components, i, h, v, predictor, point_transform;
1178  int index, id, ret;
1179  const int block_size = s->lossless ? 1 : 8;
1180  int ilv, prev_shift;
1181 
1182  if (!s->got_picture) {
1183  av_log(s->avctx, AV_LOG_WARNING,
1184  "Can not process SOS before SOF, skipping\n");
1185  return -1;
1186  }
1187 
1188  av_assert0(s->picture_ptr->data[0]);
1189  /* XXX: verify len field validity */
1190  len = get_bits(&s->gb, 16);
1191  nb_components = get_bits(&s->gb, 8);
1192  if (nb_components == 0 || nb_components > MAX_COMPONENTS) {
1193  av_log(s->avctx, AV_LOG_ERROR,
1194  "decode_sos: nb_components (%d) unsupported\n", nb_components);
1195  return AVERROR_PATCHWELCOME;
1196  }
1197  if (len != 6 + 2 * nb_components) {
1198  av_log(s->avctx, AV_LOG_ERROR, "decode_sos: invalid len (%d)\n", len);
1199  return AVERROR_INVALIDDATA;
1200  }
1201  for (i = 0; i < nb_components; i++) {
1202  id = get_bits(&s->gb, 8) - 1;
1203  av_log(s->avctx, AV_LOG_DEBUG, "component: %d\n", id);
1204  /* find component index */
1205  for (index = 0; index < s->nb_components; index++)
1206  if (id == s->component_id[index])
1207  break;
1208  if (index == s->nb_components) {
1209  av_log(s->avctx, AV_LOG_ERROR,
1210  "decode_sos: index(%d) out of components\n", index);
1211  return AVERROR_INVALIDDATA;
1212  }
1213  /* Metasoft MJPEG codec has Cb and Cr swapped */
1214  if (s->avctx->codec_tag == MKTAG('M', 'T', 'S', 'J')
1215  && nb_components == 3 && s->nb_components == 3 && i)
1216  index = 3 - i;
1217 
1218  if(nb_components == 3 && s->nb_components == 3 && s->avctx->pix_fmt == AV_PIX_FMT_GBR24P)
1219  index = (i+2)%3;
1220  if(nb_components == 1 && s->nb_components == 3 && s->avctx->pix_fmt == AV_PIX_FMT_GBR24P)
1221  index = (index+2)%3;
1222 
1223  s->comp_index[i] = index;
1224 
1225  s->nb_blocks[i] = s->h_count[index] * s->v_count[index];
1226  s->h_scount[i] = s->h_count[index];
1227  s->v_scount[i] = s->v_count[index];
1228 
1229  s->dc_index[i] = get_bits(&s->gb, 4);
1230  s->ac_index[i] = get_bits(&s->gb, 4);
1231 
1232  if (s->dc_index[i] < 0 || s->ac_index[i] < 0 ||
1233  s->dc_index[i] >= 4 || s->ac_index[i] >= 4)
1234  goto out_of_range;
1235  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))
1236  goto out_of_range;
1237  }
1238 
1239  predictor = get_bits(&s->gb, 8); /* JPEG Ss / lossless JPEG predictor /JPEG-LS NEAR */
1240  ilv = get_bits(&s->gb, 8); /* JPEG Se / JPEG-LS ILV */
1241  if(s->avctx->codec_tag != AV_RL32("CJPG")){
1242  prev_shift = get_bits(&s->gb, 4); /* Ah */
1243  point_transform = get_bits(&s->gb, 4); /* Al */
1244  }else
1245  prev_shift = point_transform = 0;
1246 
1247  if (nb_components > 1) {
1248  /* interleaved stream */
1249  s->mb_width = (s->width + s->h_max * block_size - 1) / (s->h_max * block_size);
1250  s->mb_height = (s->height + s->v_max * block_size - 1) / (s->v_max * block_size);
1251  } else if (!s->ls) { /* skip this for JPEG-LS */
1252  h = s->h_max / s->h_scount[0];
1253  v = s->v_max / s->v_scount[0];
1254  s->mb_width = (s->width + h * block_size - 1) / (h * block_size);
1255  s->mb_height = (s->height + v * block_size - 1) / (v * block_size);
1256  s->nb_blocks[0] = 1;
1257  s->h_scount[0] = 1;
1258  s->v_scount[0] = 1;
1259  }
1260 
1261  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1262  av_log(s->avctx, AV_LOG_DEBUG, "%s %s p:%d >>:%d ilv:%d bits:%d skip:%d %s comp:%d\n",
1263  s->lossless ? "lossless" : "sequential DCT", s->rgb ? "RGB" : "",
1264  predictor, point_transform, ilv, s->bits, s->mjpb_skiptosod,
1265  s->pegasus_rct ? "PRCT" : (s->rct ? "RCT" : ""), nb_components);
1266 
1267 
1268  /* mjpeg-b can have padding bytes between sos and image data, skip them */
1269  for (i = s->mjpb_skiptosod; i > 0; i--)
1270  skip_bits(&s->gb, 8);
1271 
1272 next_field:
1273  for (i = 0; i < nb_components; i++)
1274  s->last_dc[i] = 1024;
1275 
1276  if (s->lossless) {
1277  av_assert0(s->picture_ptr == &s->picture);
1278  if (CONFIG_JPEGLS_DECODER && s->ls) {
1279 // for () {
1280 // reset_ls_coding_parameters(s, 0);
1281 
1282  if ((ret = ff_jpegls_decode_picture(s, predictor,
1283  point_transform, ilv)) < 0)
1284  return ret;
1285  } else {
1286  if (s->rgb) {
1287  if ((ret = ljpeg_decode_rgb_scan(s, nb_components, predictor, point_transform)) < 0)
1288  return ret;
1289  } else {
1290  if ((ret = ljpeg_decode_yuv_scan(s, predictor, point_transform)) < 0)
1291  return ret;
1292  }
1293  }
1294  } else {
1295  if (s->progressive && predictor) {
1296  av_assert0(s->picture_ptr == &s->picture);
1297  if ((ret = mjpeg_decode_scan_progressive_ac(s, predictor,
1298  ilv, prev_shift,
1299  point_transform)) < 0)
1300  return ret;
1301  } else {
1302  if ((ret = mjpeg_decode_scan(s, nb_components,
1303  prev_shift, point_transform,
1304  mb_bitmask, reference)) < 0)
1305  return ret;
1306  }
1307  }
1308 
1309  if (s->interlaced &&
1310  get_bits_left(&s->gb) > 32 &&
1311  show_bits(&s->gb, 8) == 0xFF) {
1312  GetBitContext bak = s->gb;
1313  align_get_bits(&bak);
1314  if (show_bits(&bak, 16) == 0xFFD1) {
1315  av_log(s->avctx, AV_LOG_DEBUG, "AVRn interlaced picture marker found\n");
1316  s->gb = bak;
1317  skip_bits(&s->gb, 16);
1318  s->bottom_field ^= 1;
1319 
1320  goto next_field;
1321  }
1322  }
1323 
1324  emms_c();
1325  return 0;
1326  out_of_range:
1327  av_log(s->avctx, AV_LOG_ERROR, "decode_sos: ac/dc index out of range\n");
1328  return AVERROR_INVALIDDATA;
1329 }
1330 
1331 static int mjpeg_decode_dri(MJpegDecodeContext *s)
1332 {
1333  if (get_bits(&s->gb, 16) != 4)
1334  return AVERROR_INVALIDDATA;
1335  s->restart_interval = get_bits(&s->gb, 16);
1336  s->restart_count = 0;
1337  av_log(s->avctx, AV_LOG_DEBUG, "restart interval: %d\n",
1338  s->restart_interval);
1339 
1340  return 0;
1341 }
1342 
1343 static int mjpeg_decode_app(MJpegDecodeContext *s)
1344 {
1345  int len, id, i;
1346 
1347  len = get_bits(&s->gb, 16);
1348  if (len < 5)
1349  return AVERROR_INVALIDDATA;
1350  if (8 * len > get_bits_left(&s->gb))
1351  return AVERROR_INVALIDDATA;
1352 
1353  id = get_bits_long(&s->gb, 32);
1354  id = av_be2ne32(id);
1355  len -= 6;
1356 
1357  if (s->avctx->debug & FF_DEBUG_STARTCODE)
1358  av_log(s->avctx, AV_LOG_DEBUG, "APPx %8X\n", id);
1359 
1360  /* Buggy AVID, it puts EOI only at every 10th frame. */
1361  /* Also, this fourcc is used by non-avid files too, it holds some
1362  information, but it's always present in AVID-created files. */
1363  if (id == AV_RL32("AVI1")) {
1364  /* structure:
1365  4bytes AVI1
1366  1bytes polarity
1367  1bytes always zero
1368  4bytes field_size
1369  4bytes field_size_less_padding
1370  */
1371  s->buggy_avid = 1;
1372  i = get_bits(&s->gb, 8); len--;
1373  av_log(s->avctx, AV_LOG_DEBUG, "polarity %d\n", i);
1374 #if 0
1375  skip_bits(&s->gb, 8);
1376  skip_bits(&s->gb, 32);
1377  skip_bits(&s->gb, 32);
1378  len -= 10;
1379 #endif
1380  goto out;
1381  }
1382 
1383 // len -= 2;
1384 
1385  if (id == AV_RL32("JFIF")) {
1386  int t_w, t_h, v1, v2;
1387  skip_bits(&s->gb, 8); /* the trailing zero-byte */
1388  v1 = get_bits(&s->gb, 8);
1389  v2 = get_bits(&s->gb, 8);
1390  skip_bits(&s->gb, 8);
1391 
1392  s->avctx->sample_aspect_ratio.num = get_bits(&s->gb, 16);
1393  s->avctx->sample_aspect_ratio.den = get_bits(&s->gb, 16);
1394 
1395  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1396  av_log(s->avctx, AV_LOG_INFO,
1397  "mjpeg: JFIF header found (version: %x.%x) SAR=%d/%d\n",
1398  v1, v2,
1399  s->avctx->sample_aspect_ratio.num,
1400  s->avctx->sample_aspect_ratio.den);
1401 
1402  t_w = get_bits(&s->gb, 8);
1403  t_h = get_bits(&s->gb, 8);
1404  if (t_w && t_h) {
1405  /* skip thumbnail */
1406  if (len -10 - (t_w * t_h * 3) > 0)
1407  len -= t_w * t_h * 3;
1408  }
1409  len -= 10;
1410  goto out;
1411  }
1412 
1413  if (id == AV_RL32("Adob") && (get_bits(&s->gb, 8) == 'e')) {
1414  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1415  av_log(s->avctx, AV_LOG_INFO, "mjpeg: Adobe header found\n");
1416  skip_bits(&s->gb, 16); /* version */
1417  skip_bits(&s->gb, 16); /* flags0 */
1418  skip_bits(&s->gb, 16); /* flags1 */
1419  skip_bits(&s->gb, 8); /* transform */
1420  len -= 7;
1421  goto out;
1422  }
1423 
1424  if (id == AV_RL32("LJIF")) {
1425  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1426  av_log(s->avctx, AV_LOG_INFO,
1427  "Pegasus lossless jpeg header found\n");
1428  skip_bits(&s->gb, 16); /* version ? */
1429  skip_bits(&s->gb, 16); /* unknown always 0? */
1430  skip_bits(&s->gb, 16); /* unknown always 0? */
1431  skip_bits(&s->gb, 16); /* unknown always 0? */
1432  switch (get_bits(&s->gb, 8)) {
1433  case 1:
1434  s->rgb = 1;
1435  s->pegasus_rct = 0;
1436  break;
1437  case 2:
1438  s->rgb = 1;
1439  s->pegasus_rct = 1;
1440  break;
1441  default:
1442  av_log(s->avctx, AV_LOG_ERROR, "unknown colorspace\n");
1443  }
1444  len -= 9;
1445  goto out;
1446  }
1447 
1448  /* Apple MJPEG-A */
1449  if ((s->start_code == APP1) && (len > (0x28 - 8))) {
1450  id = get_bits_long(&s->gb, 32);
1451  id = av_be2ne32(id);
1452  len -= 4;
1453  /* Apple MJPEG-A */
1454  if (id == AV_RL32("mjpg")) {
1455 #if 0
1456  skip_bits(&s->gb, 32); /* field size */
1457  skip_bits(&s->gb, 32); /* pad field size */
1458  skip_bits(&s->gb, 32); /* next off */
1459  skip_bits(&s->gb, 32); /* quant off */
1460  skip_bits(&s->gb, 32); /* huff off */
1461  skip_bits(&s->gb, 32); /* image off */
1462  skip_bits(&s->gb, 32); /* scan off */
1463  skip_bits(&s->gb, 32); /* data off */
1464 #endif
1465  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1466  av_log(s->avctx, AV_LOG_INFO, "mjpeg: Apple MJPEG-A header found\n");
1467  }
1468  }
1469 
1470 out:
1471  /* slow but needed for extreme adobe jpegs */
1472  if (len < 0)
1473  av_log(s->avctx, AV_LOG_ERROR,
1474  "mjpeg: error, decode_app parser read over the end\n");
1475  while (--len > 0)
1476  skip_bits(&s->gb, 8);
1477 
1478  return 0;
1479 }
1480 
1481 static int mjpeg_decode_com(MJpegDecodeContext *s)
1482 {
1483  int len = get_bits(&s->gb, 16);
1484  if (len >= 2 && 8 * len - 16 <= get_bits_left(&s->gb)) {
1485  char *cbuf = av_malloc(len - 1);
1486  if (cbuf) {
1487  int i;
1488  for (i = 0; i < len - 2; i++)
1489  cbuf[i] = get_bits(&s->gb, 8);
1490  if (i > 0 && cbuf[i - 1] == '\n')
1491  cbuf[i - 1] = 0;
1492  else
1493  cbuf[i] = 0;
1494 
1495  if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1496  av_log(s->avctx, AV_LOG_INFO, "comment: '%s'\n", cbuf);
1497 
1498  /* buggy avid, it puts EOI only at every 10th frame */
1499  if (!strcmp(cbuf, "AVID")) {
1500  s->buggy_avid = 1;
1501  } else if (!strcmp(cbuf, "CS=ITU601"))
1502  s->cs_itu601 = 1;
1503  else if ((len > 31 && !strncmp(cbuf, "Intel(R) JPEG Library, version 1", 32)) ||
1504  (len > 19 && !strncmp(cbuf, "Metasoft MJPEG Codec", 20)))
1505  s->flipped = 1;
1506 
1507  av_free(cbuf);
1508  }
1509  }
1510 
1511  return 0;
1512 }
1513 
1514 /* return the 8 bit start code value and update the search
1515  state. Return -1 if no start code found */
1516 static int find_marker(const uint8_t **pbuf_ptr, const uint8_t *buf_end)
1517 {
1518  const uint8_t *buf_ptr;
1519  unsigned int v, v2;
1520  int val;
1521  int skipped = 0;
1522 
1523  buf_ptr = *pbuf_ptr;
1524  while (buf_ptr < buf_end) {
1525  v = *buf_ptr++;
1526  v2 = *buf_ptr;
1527  if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe) && buf_ptr < buf_end) {
1528  val = *buf_ptr++;
1529  goto found;
1530  }
1531  skipped++;
1532  }
1533  val = -1;
1534 found:
1535  av_dlog(NULL, "find_marker skipped %d bytes\n", skipped);
1536  *pbuf_ptr = buf_ptr;
1537  return val;
1538 }
1539 
1540 int ff_mjpeg_find_marker(MJpegDecodeContext *s,
1541  const uint8_t **buf_ptr, const uint8_t *buf_end,
1542  const uint8_t **unescaped_buf_ptr,
1543  int *unescaped_buf_size)
1544 {
1545  int start_code;
1546  start_code = find_marker(buf_ptr, buf_end);
1547 
1548  av_fast_padded_malloc(&s->buffer, &s->buffer_size, buf_end - *buf_ptr);
1549  if (!s->buffer)
1550  return AVERROR(ENOMEM);
1551 
1552  /* unescape buffer of SOS, use special treatment for JPEG-LS */
1553  if (start_code == SOS && !s->ls) {
1554  const uint8_t *src = *buf_ptr;
1555  uint8_t *dst = s->buffer;
1556 
1557  while (src < buf_end) {
1558  uint8_t x = *(src++);
1559 
1560  *(dst++) = x;
1561  if (s->avctx->codec_id != AV_CODEC_ID_THP) {
1562  if (x == 0xff) {
1563  while (src < buf_end && x == 0xff)
1564  x = *(src++);
1565 
1566  if (x >= 0xd0 && x <= 0xd7)
1567  *(dst++) = x;
1568  else if (x)
1569  break;
1570  }
1571  }
1572  }
1573  *unescaped_buf_ptr = s->buffer;
1574  *unescaped_buf_size = dst - s->buffer;
1575  memset(s->buffer + *unescaped_buf_size, 0,
1576  FF_INPUT_BUFFER_PADDING_SIZE);
1577 
1578  av_log(s->avctx, AV_LOG_DEBUG, "escaping removed %td bytes\n",
1579  (buf_end - *buf_ptr) - (dst - s->buffer));
1580  } else if (start_code == SOS && s->ls) {
1581  const uint8_t *src = *buf_ptr;
1582  uint8_t *dst = s->buffer;
1583  int bit_count = 0;
1584  int t = 0, b = 0;
1585  PutBitContext pb;
1586 
1587  s->cur_scan++;
1588 
1589  /* find marker */
1590  while (src + t < buf_end) {
1591  uint8_t x = src[t++];
1592  if (x == 0xff) {
1593  while ((src + t < buf_end) && x == 0xff)
1594  x = src[t++];
1595  if (x & 0x80) {
1596  t -= 2;
1597  break;
1598  }
1599  }
1600  }
1601  bit_count = t * 8;
1602  init_put_bits(&pb, dst, t);
1603 
1604  /* unescape bitstream */
1605  while (b < t) {
1606  uint8_t x = src[b++];
1607  put_bits(&pb, 8, x);
1608  if (x == 0xFF) {
1609  x = src[b++];
1610  put_bits(&pb, 7, x);
1611  bit_count--;
1612  }
1613  }
1614  flush_put_bits(&pb);
1615 
1616  *unescaped_buf_ptr = dst;
1617  *unescaped_buf_size = (bit_count + 7) >> 3;
1618  memset(s->buffer + *unescaped_buf_size, 0,
1619  FF_INPUT_BUFFER_PADDING_SIZE);
1620  } else {
1621  *unescaped_buf_ptr = *buf_ptr;
1622  *unescaped_buf_size = buf_end - *buf_ptr;
1623  }
1624 
1625  return start_code;
1626 }
1627 
1628 int ff_mjpeg_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
1629  AVPacket *avpkt)
1630 {
1631  const uint8_t *buf = avpkt->data;
1632  int buf_size = avpkt->size;
1633  MJpegDecodeContext *s = avctx->priv_data;
1634  const uint8_t *buf_end, *buf_ptr;
1635  const uint8_t *unescaped_buf_ptr;
1636  int hshift, vshift;
1637  int unescaped_buf_size;
1638  int start_code;
1639  int i, index;
1640  int ret = 0;
1641  AVFrame *picture = data;
1642 
1643  buf_ptr = buf;
1644  buf_end = buf + buf_size;
1645  while (buf_ptr < buf_end) {
1646  /* find start next marker */
1647  start_code = ff_mjpeg_find_marker(s, &buf_ptr, buf_end,
1648  &unescaped_buf_ptr,
1649  &unescaped_buf_size);
1650  /* EOF */
1651  if (start_code < 0) {
1652  goto the_end;
1653  } else if (unescaped_buf_size > (1U<<28)) {
1654  av_log(avctx, AV_LOG_ERROR, "MJPEG packet 0x%x too big (0x%x/0x%x), corrupt data?\n",
1655  start_code, unescaped_buf_size, buf_size);
1656  return AVERROR_INVALIDDATA;
1657  } else {
1658  av_log(avctx, AV_LOG_DEBUG, "marker=%x avail_size_in_buf=%td\n",
1659  start_code, buf_end - buf_ptr);
1660 
1661  init_get_bits(&s->gb, unescaped_buf_ptr, unescaped_buf_size * 8);
1662 
1663  s->start_code = start_code;
1664  if (s->avctx->debug & FF_DEBUG_STARTCODE)
1665  av_log(avctx, AV_LOG_DEBUG, "startcode: %X\n", start_code);
1666 
1667  /* process markers */
1668  if (start_code >= 0xd0 && start_code <= 0xd7)
1669  av_log(avctx, AV_LOG_DEBUG,
1670  "restart marker: %d\n", start_code & 0x0f);
1671  /* APP fields */
1672  else if (start_code >= APP0 && start_code <= APP15)
1673  mjpeg_decode_app(s);
1674  /* Comment */
1675  else if (start_code == COM)
1676  mjpeg_decode_com(s);
1677 
1678  ret = -1;
1679  switch (start_code) {
1680  case SOI:
1681  s->restart_interval = 0;
1682  s->restart_count = 0;
1683  /* nothing to do on SOI */
1684  break;
1685  case DQT:
1686  ff_mjpeg_decode_dqt(s);
1687  break;
1688  case DHT:
1689  if ((ret = ff_mjpeg_decode_dht(s)) < 0) {
1690  av_log(avctx, AV_LOG_ERROR, "huffman table decode error\n");
1691  goto fail;
1692  }
1693  break;
1694  case SOF0:
1695  case SOF1:
1696  s->lossless = 0;
1697  s->ls = 0;
1698  s->progressive = 0;
1699  if ((ret = ff_mjpeg_decode_sof(s)) < 0)
1700  goto fail;
1701  break;
1702  case SOF2:
1703  s->lossless = 0;
1704  s->ls = 0;
1705  s->progressive = 1;
1706  if ((ret = ff_mjpeg_decode_sof(s)) < 0)
1707  goto fail;
1708  break;
1709  case SOF3:
1710  s->lossless = 1;
1711  s->ls = 0;
1712  s->progressive = 0;
1713  if ((ret = ff_mjpeg_decode_sof(s)) < 0)
1714  goto fail;
1715  break;
1716  case SOF48:
1717  s->lossless = 1;
1718  s->ls = 1;
1719  s->progressive = 0;
1720  if ((ret = ff_mjpeg_decode_sof(s)) < 0)
1721  goto fail;
1722  break;
1723  case LSE:
1724  if (!CONFIG_JPEGLS_DECODER ||
1725  (ret = ff_jpegls_decode_lse(s)) < 0)
1726  goto fail;
1727  break;
1728  case EOI:
1729 eoi_parser:
1730  s->cur_scan = 0;
1731  if (!s->got_picture) {
1732  av_log(avctx, AV_LOG_WARNING,
1733  "Found EOI before any SOF, ignoring\n");
1734  break;
1735  }
1736  if (s->interlaced) {
1737  s->bottom_field ^= 1;
1738  /* if not bottom field, do not output image yet */
1739  if (s->bottom_field == !s->interlace_polarity)
1740  break;
1741  }
1742  *picture = *s->picture_ptr;
1743  *got_frame = 1;
1744  s->got_picture = 0;
1745 
1746  if (!s->lossless) {
1747  picture->quality = FFMAX3(s->qscale[0],
1748  s->qscale[1],
1749  s->qscale[2]);
1750  picture->qstride = 0;
1751  picture->qscale_table = s->qscale_table;
1752  memset(picture->qscale_table, picture->quality,
1753  (s->width + 15) / 16);
1754  if (avctx->debug & FF_DEBUG_QP)
1755  av_log(avctx, AV_LOG_DEBUG,
1756  "QP: %d\n", picture->quality);
1757  picture->quality *= FF_QP2LAMBDA;
1758  }
1759 
1760  goto the_end;
1761  case SOS:
1762  if ((ret = ff_mjpeg_decode_sos(s, NULL, NULL)) < 0 &&
1763  (avctx->err_recognition & AV_EF_EXPLODE))
1764  goto fail;
1765  break;
1766  case DRI:
1767  mjpeg_decode_dri(s);
1768  break;
1769  case SOF5:
1770  case SOF6:
1771  case SOF7:
1772  case SOF9:
1773  case SOF10:
1774  case SOF11:
1775  case SOF13:
1776  case SOF14:
1777  case SOF15:
1778  case JPG:
1779  av_log(avctx, AV_LOG_ERROR,
1780  "mjpeg: unsupported coding type (%x)\n", start_code);
1781  break;
1782  }
1783 
1784  /* eof process start code */
1785  buf_ptr += (get_bits_count(&s->gb) + 7) / 8;
1786  av_log(avctx, AV_LOG_DEBUG,
1787  "marker parser used %d bytes (%d bits)\n",
1788  (get_bits_count(&s->gb) + 7) / 8, get_bits_count(&s->gb));
1789  }
1790  }
1791  if (s->got_picture) {
1792  av_log(avctx, AV_LOG_WARNING, "EOI missing, emulating\n");
1793  goto eoi_parser;
1794  }
1795  av_log(avctx, AV_LOG_FATAL, "No JPEG data found in image\n");
1796  return AVERROR_INVALIDDATA;
1797 fail:
1798  s->got_picture = 0;
1799  return ret;
1800 the_end:
1801  if (s->upscale_h) {
1802  uint8_t *line = s->picture_ptr->data[s->upscale_h];
1803  av_assert0(avctx->pix_fmt == AV_PIX_FMT_YUVJ444P ||
1804  avctx->pix_fmt == AV_PIX_FMT_YUV444P ||
1805  avctx->pix_fmt == AV_PIX_FMT_YUVJ440P ||
1806  avctx->pix_fmt == AV_PIX_FMT_YUV440P);
1807  for (i = 0; i < s->chroma_height; i++) {
1808  for (index = s->width - 1; index; index--)
1809  line[index] = (line[index / 2] + line[(index + 1) / 2]) >> 1;
1810  line += s->linesize[s->upscale_h];
1811  }
1812  }
1813  if (s->upscale_v) {
1814  uint8_t *dst = &((uint8_t *)s->picture_ptr->data[s->upscale_v])[(s->height - 1) * s->linesize[s->upscale_v]];
1815  int w;
1816  avcodec_get_chroma_sub_sample(s->avctx->pix_fmt, &hshift, &vshift);
1817  w = s->width >> hshift;
1818  av_assert0(avctx->pix_fmt == AV_PIX_FMT_YUVJ444P ||
1819  avctx->pix_fmt == AV_PIX_FMT_YUV444P ||
1820  avctx->pix_fmt == AV_PIX_FMT_YUVJ422P ||
1821  avctx->pix_fmt == AV_PIX_FMT_YUV422P);
1822  for (i = s->height - 1; i; i--) {
1823  uint8_t *src1 = &((uint8_t *)s->picture_ptr->data[s->upscale_v])[i / 2 * s->linesize[s->upscale_v]];
1824  uint8_t *src2 = &((uint8_t *)s->picture_ptr->data[s->upscale_v])[(i + 1) / 2 * s->linesize[s->upscale_v]];
1825  if (src1 == src2) {
1826  memcpy(dst, src1, w);
1827  } else {
1828  for (index = 0; index < w; index++)
1829  dst[index] = (src1[index] + src2[index]) >> 1;
1830  }
1831  dst -= s->linesize[s->upscale_v];
1832  }
1833  }
1834  if (s->flipped && (s->avctx->flags & CODEC_FLAG_EMU_EDGE)) {
1835  int j;
1836  avcodec_get_chroma_sub_sample(s->avctx->pix_fmt, &hshift, &vshift);
1837  for (index=0; index<4; index++) {
1838  uint8_t *dst = s->picture_ptr->data[index];
1839  int w = s->width;
1840  int h = s->height;
1841  if(index && index<3){
1842  w = -((-w) >> hshift);
1843  h = -((-h) >> vshift);
1844  }
1845  if(dst){
1846  uint8_t *dst2 = dst + s->linesize[index]*(h-1);
1847  for (i=0; i<h/2; i++) {
1848  for (j=0; j<w; j++)
1849  FFSWAP(int, dst[j], dst2[j]);
1850  dst += s->linesize[index];
1851  dst2 -= s->linesize[index];
1852  }
1853  }
1854  }
1855  }
1856 
1857  av_log(avctx, AV_LOG_DEBUG, "decode frame unused %td bytes\n",
1858  buf_end - buf_ptr);
1859 // return buf_end - buf_ptr;
1860  return buf_ptr - buf;
1861 }
1862 
1863 av_cold int ff_mjpeg_decode_end(AVCodecContext *avctx)
1864 {
1865  MJpegDecodeContext *s = avctx->priv_data;
1866  int i, j;
1867 
1868  if (s->picture_ptr && s->picture_ptr->data[0])
1869  avctx->release_buffer(avctx, s->picture_ptr);
1870 
1871  av_free(s->buffer);
1872  av_free(s->qscale_table);
1873  av_freep(&s->ljpeg_buffer);
1874  s->ljpeg_buffer_size = 0;
1875 
1876  for (i = 0; i < 3; i++) {
1877  for (j = 0; j < 4; j++)
1878  ff_free_vlc(&s->vlcs[i][j]);
1879  }
1880  for (i = 0; i < MAX_COMPONENTS; i++) {
1881  av_freep(&s->blocks[i]);
1882  av_freep(&s->last_nnz[i]);
1883  }
1884  return 0;
1885 }
1886 
1887 static void decode_flush(AVCodecContext *avctx)
1888 {
1889  MJpegDecodeContext *s = avctx->priv_data;
1890  s->got_picture = 0;
1891 }
1892 
1893 #if CONFIG_MJPEG_DECODER
1894 #define OFFSET(x) offsetof(MJpegDecodeContext, x)
1895 #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
1896 static const AVOption options[] = {
1897  { "extern_huff", "Use external huffman table.",
1898  OFFSET(extern_huff), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VD },
1899  { NULL },
1900 };
1901 
1902 static const AVClass mjpegdec_class = {
1903  .class_name = "MJPEG decoder",
1904  .item_name = av_default_item_name,
1905  .option = options,
1906  .version = LIBAVUTIL_VERSION_INT,
1907 };
1908 
1909 AVCodec ff_mjpeg_decoder = {
1910  .name = "mjpeg",
1911  .type = AVMEDIA_TYPE_VIDEO,
1912  .id = AV_CODEC_ID_MJPEG,
1913  .priv_data_size = sizeof(MJpegDecodeContext),
1914  .init = ff_mjpeg_decode_init,
1915  .close = ff_mjpeg_decode_end,
1916  .decode = ff_mjpeg_decode_frame,
1917  .flush = decode_flush,
1918  .capabilities = CODEC_CAP_DR1,
1919  .max_lowres = 3,
1920  .long_name = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),
1921  .priv_class = &mjpegdec_class,
1922 };
1923 #endif
1924 #if CONFIG_THP_DECODER
1925 AVCodec ff_thp_decoder = {
1926  .name = "thp",
1927  .type = AVMEDIA_TYPE_VIDEO,
1928  .id = AV_CODEC_ID_THP,
1929  .priv_data_size = sizeof(MJpegDecodeContext),
1930  .init = ff_mjpeg_decode_init,
1931  .close = ff_mjpeg_decode_end,
1932  .decode = ff_mjpeg_decode_frame,
1933  .flush = decode_flush,
1934  .capabilities = CODEC_CAP_DR1,
1935  .max_lowres = 3,
1936  .long_name = NULL_IF_CONFIG_SMALL("Nintendo Gamecube THP video"),
1937 };
1938 #endif
Generated on Sat May 25 2013 03:58:37 for FFmpeg by   doxygen 1.8.2