FFmpeg  2.6.9
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img2dec.c
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1 /*
2  * Image format
3  * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
4  * Copyright (c) 2004 Michael Niedermayer
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #define _BSD_SOURCE
24 #include <sys/stat.h>
25 #include "libavutil/avstring.h"
26 #include "libavutil/log.h"
27 #include "libavutil/opt.h"
28 #include "libavutil/pixdesc.h"
29 #include "libavutil/parseutils.h"
30 #include "libavutil/intreadwrite.h"
31 #include "avformat.h"
32 #include "avio_internal.h"
33 #include "internal.h"
34 #include "img2.h"
35 
36 #if HAVE_GLOB
37 /* Locally define as 0 (bitwise-OR no-op) any missing glob options that
38  are non-posix glibc/bsd extensions. */
39 #ifndef GLOB_NOMAGIC
40 #define GLOB_NOMAGIC 0
41 #endif
42 #ifndef GLOB_BRACE
43 #define GLOB_BRACE 0
44 #endif
45 
46 #endif /* HAVE_GLOB */
47 
48 static const int sizes[][2] = {
49  { 640, 480 },
50  { 720, 480 },
51  { 720, 576 },
52  { 352, 288 },
53  { 352, 240 },
54  { 160, 128 },
55  { 512, 384 },
56  { 640, 352 },
57  { 640, 240 },
58 };
59 
60 static int infer_size(int *width_ptr, int *height_ptr, int size)
61 {
62  int i;
63 
64  for (i = 0; i < FF_ARRAY_ELEMS(sizes); i++) {
65  if ((sizes[i][0] * sizes[i][1]) == size) {
66  *width_ptr = sizes[i][0];
67  *height_ptr = sizes[i][1];
68  return 0;
69  }
70  }
71 
72  return -1;
73 }
74 
75 static int is_glob(const char *path)
76 {
77 #if HAVE_GLOB
78  size_t span = 0;
79  const char *p = path;
80 
81  while (p = strchr(p, '%')) {
82  if (*(++p) == '%') {
83  ++p;
84  continue;
85  }
86  if (span = strspn(p, "*?[]{}"))
87  break;
88  }
89  /* Did we hit a glob char or get to the end? */
90  return span != 0;
91 #else
92  return 0;
93 #endif
94 }
95 
96 /**
97  * Get index range of image files matched by path.
98  *
99  * @param pfirst_index pointer to index updated with the first number in the range
100  * @param plast_index pointer to index updated with the last number in the range
101  * @param path path which has to be matched by the image files in the range
102  * @param start_index minimum accepted value for the first index in the range
103  * @return -1 if no image file could be found
104  */
105 static int find_image_range(int *pfirst_index, int *plast_index,
106  const char *path, int start_index, int start_index_range)
107 {
108  char buf[1024];
109  int range, last_index, range1, first_index;
110 
111  /* find the first image */
112  for (first_index = start_index; first_index < start_index + start_index_range; first_index++) {
113  if (av_get_frame_filename(buf, sizeof(buf), path, first_index) < 0) {
114  *pfirst_index =
115  *plast_index = 1;
116  if (avio_check(buf, AVIO_FLAG_READ) > 0)
117  return 0;
118  return -1;
119  }
120  if (avio_check(buf, AVIO_FLAG_READ) > 0)
121  break;
122  }
123  if (first_index == start_index + start_index_range)
124  goto fail;
125 
126  /* find the last image */
127  last_index = first_index;
128  for (;;) {
129  range = 0;
130  for (;;) {
131  if (!range)
132  range1 = 1;
133  else
134  range1 = 2 * range;
135  if (av_get_frame_filename(buf, sizeof(buf), path,
136  last_index + range1) < 0)
137  goto fail;
138  if (avio_check(buf, AVIO_FLAG_READ) <= 0)
139  break;
140  range = range1;
141  /* just in case... */
142  if (range >= (1 << 30))
143  goto fail;
144  }
145  /* we are sure than image last_index + range exists */
146  if (!range)
147  break;
148  last_index += range;
149  }
150  *pfirst_index = first_index;
151  *plast_index = last_index;
152  return 0;
153 
154 fail:
155  return -1;
156 }
157 
159 {
160  if (p->filename && ff_guess_image2_codec(p->filename)) {
162  return AVPROBE_SCORE_MAX;
163  else if (is_glob(p->filename))
164  return AVPROBE_SCORE_MAX;
165  else if (p->filename[strcspn(p->filename, "*?{")]) // probably PT_GLOB
166  return AVPROBE_SCORE_EXTENSION + 2; // score chosen to be a tad above the image pipes
167  else if (p->buf_size == 0)
168  return 0;
169  else if (av_match_ext(p->filename, "raw") || av_match_ext(p->filename, "gif"))
170  return 5;
171  else
173  }
174  return 0;
175 }
176 
178 {
179  VideoDemuxData *s = s1->priv_data;
180  int first_index, last_index;
181  AVStream *st;
183 
185 
186  st = avformat_new_stream(s1, NULL);
187  if (!st) {
188  return AVERROR(ENOMEM);
189  }
190 
191  if (s->pixel_format &&
192  (pix_fmt = av_get_pix_fmt(s->pixel_format)) == AV_PIX_FMT_NONE) {
193  av_log(s1, AV_LOG_ERROR, "No such pixel format: %s.\n",
194  s->pixel_format);
195  return AVERROR(EINVAL);
196  }
197 
198  av_strlcpy(s->path, s1->filename, sizeof(s->path));
199  s->img_number = 0;
200  s->img_count = 0;
201 
202  /* find format */
203  if (s1->iformat->flags & AVFMT_NOFILE)
204  s->is_pipe = 0;
205  else {
206  s->is_pipe = 1;
208  }
209 
210  if (s->ts_from_file == 2) {
211 #if !HAVE_STRUCT_STAT_ST_MTIM_TV_NSEC
212  av_log(s1, AV_LOG_ERROR, "POSIX.1-2008 not supported, nanosecond file timestamps unavailable\n");
213  return AVERROR(ENOSYS);
214 #endif
215  avpriv_set_pts_info(st, 64, 1, 1000000000);
216  } else if (s->ts_from_file)
217  avpriv_set_pts_info(st, 64, 1, 1);
218  else
220 
221  if (s->width && s->height) {
222  st->codec->width = s->width;
223  st->codec->height = s->height;
224  }
225 
226  if (!s->is_pipe) {
227  if (s->pattern_type == PT_GLOB_SEQUENCE) {
228  s->use_glob = is_glob(s->path);
229  if (s->use_glob) {
230 #if HAVE_GLOB
231  char *p = s->path, *q, *dup;
232  int gerr;
233 #endif
234 
235  av_log(s1, AV_LOG_WARNING, "Pattern type 'glob_sequence' is deprecated: "
236  "use pattern_type 'glob' instead\n");
237 #if HAVE_GLOB
238  dup = q = av_strdup(p);
239  while (*q) {
240  /* Do we have room for the next char and a \ insertion? */
241  if ((p - s->path) >= (sizeof(s->path) - 2))
242  break;
243  if (*q == '%' && strspn(q + 1, "%*?[]{}"))
244  ++q;
245  else if (strspn(q, "\\*?[]{}"))
246  *p++ = '\\';
247  *p++ = *q++;
248  }
249  *p = 0;
250  av_free(dup);
251 
252  gerr = glob(s->path, GLOB_NOCHECK|GLOB_BRACE|GLOB_NOMAGIC, NULL, &s->globstate);
253  if (gerr != 0) {
254  return AVERROR(ENOENT);
255  }
256  first_index = 0;
257  last_index = s->globstate.gl_pathc - 1;
258 #endif
259  }
260  }
261  if ((s->pattern_type == PT_GLOB_SEQUENCE && !s->use_glob) || s->pattern_type == PT_SEQUENCE) {
262  if (find_image_range(&first_index, &last_index, s->path,
263  s->start_number, s->start_number_range) < 0) {
264  av_log(s1, AV_LOG_ERROR,
265  "Could find no file with path '%s' and index in the range %d-%d\n",
266  s->path, s->start_number, s->start_number + s->start_number_range - 1);
267  return AVERROR(ENOENT);
268  }
269  } else if (s->pattern_type == PT_GLOB) {
270 #if HAVE_GLOB
271  int gerr;
272  gerr = glob(s->path, GLOB_NOCHECK|GLOB_BRACE|GLOB_NOMAGIC, NULL, &s->globstate);
273  if (gerr != 0) {
274  return AVERROR(ENOENT);
275  }
276  first_index = 0;
277  last_index = s->globstate.gl_pathc - 1;
278  s->use_glob = 1;
279 #else
280  av_log(s1, AV_LOG_ERROR,
281  "Pattern type 'glob' was selected but globbing "
282  "is not supported by this libavformat build\n");
283  return AVERROR(ENOSYS);
284 #endif
285  } else if (s->pattern_type != PT_GLOB_SEQUENCE) {
286  av_log(s1, AV_LOG_ERROR,
287  "Unknown value '%d' for pattern_type option\n", s->pattern_type);
288  return AVERROR(EINVAL);
289  }
290  s->img_first = first_index;
291  s->img_last = last_index;
292  s->img_number = first_index;
293  /* compute duration */
294  if (!s->ts_from_file) {
295  st->start_time = 0;
296  st->duration = last_index - first_index + 1;
297  }
298  }
299 
300  if (s1->video_codec_id) {
302  st->codec->codec_id = s1->video_codec_id;
303  } else if (s1->audio_codec_id) {
305  st->codec->codec_id = s1->audio_codec_id;
306  } else if (s1->iformat->raw_codec_id) {
308  st->codec->codec_id = s1->iformat->raw_codec_id;
309  } else {
310  const char *str = strrchr(s->path, '.');
311  s->split_planes = str && !av_strcasecmp(str + 1, "y");
313  if (s1->pb) {
314  int probe_buffer_size = 2048;
315  uint8_t *probe_buffer = av_realloc(NULL, probe_buffer_size + AVPROBE_PADDING_SIZE);
317  AVProbeData pd = { 0 };
318 
319  if (!probe_buffer)
320  return AVERROR(ENOMEM);
321 
322  probe_buffer_size = avio_read(s1->pb, probe_buffer, probe_buffer_size);
323  if (probe_buffer_size < 0) {
324  av_free(probe_buffer);
325  return probe_buffer_size;
326  }
327  memset(probe_buffer + probe_buffer_size, 0, AVPROBE_PADDING_SIZE);
328 
329  pd.buf = probe_buffer;
330  pd.buf_size = probe_buffer_size;
331  pd.filename = s1->filename;
332 
333  while ((fmt = av_iformat_next(fmt))) {
334  if (fmt->read_header != ff_img_read_header ||
335  !fmt->read_probe ||
336  (fmt->flags & AVFMT_NOFILE) ||
337  !fmt->raw_codec_id)
338  continue;
339  if (fmt->read_probe(&pd) > 0) {
340  st->codec->codec_id = fmt->raw_codec_id;
341  break;
342  }
343  }
344  if (s1->flags & AVFMT_FLAG_CUSTOM_IO) {
345  avio_seek(s1->pb, 0, SEEK_SET);
346  } else
347  ffio_rewind_with_probe_data(s1->pb, &probe_buffer, probe_buffer_size);
348  }
349  if (st->codec->codec_id == AV_CODEC_ID_NONE)
351  if (st->codec->codec_id == AV_CODEC_ID_LJPEG)
353  if (st->codec->codec_id == AV_CODEC_ID_ALIAS_PIX) // we cannot distingiush this from BRENDER_PIX
355  }
356  if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
357  pix_fmt != AV_PIX_FMT_NONE)
358  st->codec->pix_fmt = pix_fmt;
359 
360  return 0;
361 }
362 
364 {
365  VideoDemuxData *s = s1->priv_data;
366  char filename_bytes[1024];
367  char *filename = filename_bytes;
368  int i, res;
369  int size[3] = { 0 }, ret[3] = { 0 };
370  AVIOContext *f[3] = { NULL };
371  AVCodecContext *codec = s1->streams[0]->codec;
372 
373  if (!s->is_pipe) {
374  /* loop over input */
375  if (s->loop && s->img_number > s->img_last) {
376  s->img_number = s->img_first;
377  }
378  if (s->img_number > s->img_last)
379  return AVERROR_EOF;
380  if (s->use_glob) {
381 #if HAVE_GLOB
382  filename = s->globstate.gl_pathv[s->img_number];
383 #endif
384  } else {
385  if (av_get_frame_filename(filename_bytes, sizeof(filename_bytes),
386  s->path,
387  s->img_number) < 0 && s->img_number > 1)
388  return AVERROR(EIO);
389  }
390  for (i = 0; i < 3; i++) {
391  if (avio_open2(&f[i], filename, AVIO_FLAG_READ,
392  &s1->interrupt_callback, NULL) < 0) {
393  if (i >= 1)
394  break;
395  av_log(s1, AV_LOG_ERROR, "Could not open file : %s\n",
396  filename);
397  return AVERROR(EIO);
398  }
399  size[i] = avio_size(f[i]);
400 
401  if (!s->split_planes)
402  break;
403  filename[strlen(filename) - 1] = 'U' + i;
404  }
405 
406  if (codec->codec_id == AV_CODEC_ID_NONE) {
407  AVProbeData pd = { 0 };
408  AVInputFormat *ifmt;
410  int ret;
411  int score = 0;
412 
413  ret = avio_read(f[0], header, PROBE_BUF_MIN);
414  if (ret < 0)
415  return ret;
416  memset(header + ret, 0, sizeof(header) - ret);
417  avio_skip(f[0], -ret);
418  pd.buf = header;
419  pd.buf_size = ret;
420  pd.filename = filename;
421 
422  ifmt = av_probe_input_format3(&pd, 1, &score);
423  if (ifmt && ifmt->read_packet == ff_img_read_packet && ifmt->raw_codec_id)
424  codec->codec_id = ifmt->raw_codec_id;
425  }
426 
427  if (codec->codec_id == AV_CODEC_ID_RAWVIDEO && !codec->width)
428  infer_size(&codec->width, &codec->height, size[0]);
429  } else {
430  f[0] = s1->pb;
431  if (avio_feof(f[0]) && s->loop && s->is_pipe)
432  avio_seek(f[0], 0, SEEK_SET);
433  if (avio_feof(f[0]))
434  return AVERROR_EOF;
435  if (s->frame_size > 0) {
436  size[0] = s->frame_size;
437  } else if (!s1->streams[0]->parser) {
438  size[0] = avio_size(s1->pb);
439  } else {
440  size[0] = 4096;
441  }
442  }
443 
444  res = av_new_packet(pkt, size[0] + size[1] + size[2]);
445  if (res < 0) {
446  goto fail;
447  }
448  pkt->stream_index = 0;
449  pkt->flags |= AV_PKT_FLAG_KEY;
450  if (s->ts_from_file) {
451  struct stat img_stat;
452  if (stat(filename, &img_stat)) {
453  res = AVERROR(EIO);
454  goto fail;
455  }
456  pkt->pts = (int64_t)img_stat.st_mtime;
458  if (s->ts_from_file == 2)
459  pkt->pts = 1000000000*pkt->pts + img_stat.st_mtim.tv_nsec;
460 #endif
461  av_add_index_entry(s1->streams[0], s->img_number, pkt->pts, 0, 0, AVINDEX_KEYFRAME);
462  } else if (!s->is_pipe) {
463  pkt->pts = s->pts;
464  }
465 
466  if (s->is_pipe)
467  pkt->pos = avio_tell(f[0]);
468 
469  pkt->size = 0;
470  for (i = 0; i < 3; i++) {
471  if (f[i]) {
472  ret[i] = avio_read(f[i], pkt->data + pkt->size, size[i]);
473  if (s->loop && s->is_pipe && ret[i] == AVERROR_EOF) {
474  if (avio_seek(f[i], 0, SEEK_SET) >= 0) {
475  pkt->pos = 0;
476  ret[i] = avio_read(f[i], pkt->data + pkt->size, size[i]);
477  }
478  }
479  if (!s->is_pipe)
480  avio_closep(&f[i]);
481  if (ret[i] > 0)
482  pkt->size += ret[i];
483  }
484  }
485 
486  if (ret[0] <= 0 || ret[1] < 0 || ret[2] < 0) {
487  av_free_packet(pkt);
488  if (ret[0] < 0) {
489  res = ret[0];
490  } else if (ret[1] < 0) {
491  res = ret[1];
492  } else if (ret[2] < 0) {
493  res = ret[2];
494  } else {
495  res = AVERROR_EOF;
496  }
497  goto fail;
498  } else {
499  s->img_count++;
500  s->img_number++;
501  s->pts++;
502  return 0;
503  }
504 
505 fail:
506  if (!s->is_pipe) {
507  for (i = 0; i < 3; i++) {
508  avio_closep(&f[i]);
509  }
510  }
511  return res;
512 }
513 
514 static int img_read_close(struct AVFormatContext* s1)
515 {
516 #if HAVE_GLOB
517  VideoDemuxData *s = s1->priv_data;
518  if (s->use_glob) {
519  globfree(&s->globstate);
520  }
521 #endif
522  return 0;
523 }
524 
525 static int img_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
526 {
528  AVStream *st = s->streams[0];
529 
530  if (s1->ts_from_file) {
531  int index = av_index_search_timestamp(st, timestamp, flags);
532  if(index < 0)
533  return -1;
534  s1->img_number = st->index_entries[index].pos;
535  return 0;
536  }
537 
538  if (timestamp < 0 || !s1->loop && timestamp > s1->img_last - s1->img_first)
539  return -1;
540  s1->img_number = timestamp%(s1->img_last - s1->img_first + 1) + s1->img_first;
541  s1->pts = timestamp;
542  return 0;
543 }
544 
545 #define OFFSET(x) offsetof(VideoDemuxData, x)
546 #define DEC AV_OPT_FLAG_DECODING_PARAM
548  { "framerate", "set the video framerate", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, 0, DEC },
549  { "loop", "force loop over input file sequence", OFFSET(loop), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 1, DEC },
550 
551  { "pattern_type", "set pattern type", OFFSET(pattern_type), AV_OPT_TYPE_INT, {.i64=PT_GLOB_SEQUENCE}, 0, INT_MAX, DEC, "pattern_type"},
552  { "glob_sequence","select glob/sequence pattern type", 0, AV_OPT_TYPE_CONST, {.i64=PT_GLOB_SEQUENCE}, INT_MIN, INT_MAX, DEC, "pattern_type" },
553  { "glob", "select glob pattern type", 0, AV_OPT_TYPE_CONST, {.i64=PT_GLOB }, INT_MIN, INT_MAX, DEC, "pattern_type" },
554  { "sequence", "select sequence pattern type", 0, AV_OPT_TYPE_CONST, {.i64=PT_SEQUENCE }, INT_MIN, INT_MAX, DEC, "pattern_type" },
555 
556  { "pixel_format", "set video pixel format", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
557  { "start_number", "set first number in the sequence", OFFSET(start_number), AV_OPT_TYPE_INT, {.i64 = 0 }, INT_MIN, INT_MAX, DEC },
558  { "start_number_range", "set range for looking at the first sequence number", OFFSET(start_number_range), AV_OPT_TYPE_INT, {.i64 = 5}, 1, INT_MAX, DEC },
559  { "video_size", "set video size", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, DEC },
560  { "frame_size", "force frame size in bytes", OFFSET(frame_size), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, DEC },
561  { "ts_from_file", "set frame timestamp from file's one", OFFSET(ts_from_file), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 2, DEC, "ts_type" },
562  { "none", "none", 0, AV_OPT_TYPE_CONST, {.i64 = 0 }, 0, 2, DEC, "ts_type" },
563  { "sec", "second precision", 0, AV_OPT_TYPE_CONST, {.i64 = 1 }, 0, 2, DEC, "ts_type" },
564  { "ns", "nano second precision", 0, AV_OPT_TYPE_CONST, {.i64 = 2 }, 0, 2, DEC, "ts_type" },
565  { NULL },
566 };
567 
568 #if CONFIG_IMAGE2_DEMUXER
569 static const AVClass img2_class = {
570  .class_name = "image2 demuxer",
571  .item_name = av_default_item_name,
572  .option = ff_img_options,
573  .version = LIBAVUTIL_VERSION_INT,
574 };
575 AVInputFormat ff_image2_demuxer = {
576  .name = "image2",
577  .long_name = NULL_IF_CONFIG_SMALL("image2 sequence"),
578  .priv_data_size = sizeof(VideoDemuxData),
584  .flags = AVFMT_NOFILE,
585  .priv_class = &img2_class,
586 };
587 #endif
588 #if CONFIG_IMAGE2PIPE_DEMUXER
589 static const AVClass img2pipe_class = {
590  .class_name = "image2pipe demuxer",
591  .item_name = av_default_item_name,
592  .option = ff_img_options,
593  .version = LIBAVUTIL_VERSION_INT,
594 };
595 AVInputFormat ff_image2pipe_demuxer = {
596  .name = "image2pipe",
597  .long_name = NULL_IF_CONFIG_SMALL("piped image2 sequence"),
598  .priv_data_size = sizeof(VideoDemuxData),
601  .priv_class = &img2pipe_class,
602 };
603 #endif
604 
605 static int bmp_probe(AVProbeData *p)
606 {
607  const uint8_t *b = p->buf;
608  int ihsize;
609 
610  if (AV_RB16(b) != 0x424d)
611  return 0;
612 
613  ihsize = AV_RL32(b+14);
614  if (ihsize < 12 || ihsize > 255)
615  return 0;
616 
617  if (!AV_RN32(b + 6)) {
618  return AVPROBE_SCORE_EXTENSION + 1;
619  }
620  return AVPROBE_SCORE_EXTENSION / 4;
621 }
622 
623 static int dpx_probe(AVProbeData *p)
624 {
625  const uint8_t *b = p->buf;
626  int w, h;
627  int is_big = (AV_RN32(b) == AV_RN32("SDPX"));
628 
629  if (p->buf_size < 0x304+8)
630  return 0;
631  w = is_big ? AV_RB32(p->buf + 0x304) : AV_RL32(p->buf + 0x304);
632  h = is_big ? AV_RB32(p->buf + 0x308) : AV_RL32(p->buf + 0x308);
633  if (w <= 0 || h <= 0)
634  return 0;
635 
636  if (is_big || AV_RN32(b) == AV_RN32("XPDS"))
637  return AVPROBE_SCORE_EXTENSION + 1;
638  return 0;
639 }
640 
641 static int exr_probe(AVProbeData *p)
642 {
643  const uint8_t *b = p->buf;
644 
645  if (AV_RL32(b) == 20000630)
646  return AVPROBE_SCORE_EXTENSION + 1;
647  return 0;
648 }
649 
650 static int j2k_probe(AVProbeData *p)
651 {
652  const uint8_t *b = p->buf;
653 
654  if (AV_RB64(b) == 0x0000000c6a502020 ||
655  AV_RB32(b) == 0xff4fff51)
656  return AVPROBE_SCORE_EXTENSION + 1;
657  return 0;
658 }
659 
660 static int jpeg_probe(AVProbeData *p)
661 {
662  const uint8_t *b = p->buf;
663  int i, state = 0xD8, exif_size = 0;
664 
665  if (AV_RB16(b) != 0xFFD8 ||
666  AV_RB32(b) == 0xFFD8FFF7)
667  return 0;
668 
669  b += 2;
670  if (AV_RB16(b) == 0xFFE1 && AV_RB32(b + 4) == AV_RB32("Exif")) {
671  exif_size = AV_RB16(b + 2) + 2;
672  b += exif_size;
673  }
674  for (i = 0; i + exif_size < p->buf_size - 2; i++) {
675  int c;
676  if (b[i] != 0xFF)
677  continue;
678  c = b[i + 1];
679  switch (c) {
680  case 0xD8:
681  return 0;
682  case 0xC0:
683  case 0xC1:
684  case 0xC2:
685  case 0xC3:
686  case 0xC5:
687  case 0xC6:
688  case 0xC7:
689  if (state != 0xD8)
690  return 0;
691  state = 0xC0;
692  break;
693  case 0xDA:
694  if (state != 0xC0)
695  return 0;
696  state = 0xDA;
697  break;
698  case 0xD9:
699  if (state != 0xDA)
700  return 0;
701  state = 0xD9;
702  break;
703  default:
704  if ( (c >= 0x02 && c <= 0xBF)
705  || c == 0xC8)
706  return 0;
707  }
708  }
709 
710  if (state == 0xD9)
711  return AVPROBE_SCORE_EXTENSION + 1;
712  return AVPROBE_SCORE_EXTENSION / 8;
713 }
714 
715 static int jpegls_probe(AVProbeData *p)
716 {
717  const uint8_t *b = p->buf;
718 
719  if (AV_RB32(b) == 0xffd8fff7)
720  return AVPROBE_SCORE_EXTENSION + 1;
721  return 0;
722 }
723 
724 static int pictor_probe(AVProbeData *p)
725 {
726  const uint8_t *b = p->buf;
727 
728  if (AV_RL16(b) == 0x1234)
729  return AVPROBE_SCORE_EXTENSION / 4;
730  return 0;
731 }
732 
733 static int png_probe(AVProbeData *p)
734 {
735  const uint8_t *b = p->buf;
736 
737  if (AV_RB64(b) == 0x89504e470d0a1a0a)
738  return AVPROBE_SCORE_MAX - 1;
739  return 0;
740 }
741 
742 static int sgi_probe(AVProbeData *p)
743 {
744  const uint8_t *b = p->buf;
745 
746  if (AV_RB16(b) == 474 &&
747  (b[2] & ~1) == 0 &&
748  (b[3] & ~3) == 0 && b[3] &&
749  (AV_RB16(b + 4) & ~7) == 0 && AV_RB16(b + 4))
750  return AVPROBE_SCORE_EXTENSION + 1;
751  return 0;
752 }
753 
755 {
756  const uint8_t *b = p->buf;
757 
758  if (AV_RB32(b) == 0x59a66a95)
759  return AVPROBE_SCORE_EXTENSION + 1;
760  return 0;
761 }
762 
763 static int tiff_probe(AVProbeData *p)
764 {
765  const uint8_t *b = p->buf;
766 
767  if (AV_RB32(b) == 0x49492a00 ||
768  AV_RB32(b) == 0x4D4D002a)
769  return AVPROBE_SCORE_EXTENSION + 1;
770  return 0;
771 }
772 
773 static int webp_probe(AVProbeData *p)
774 {
775  const uint8_t *b = p->buf;
776 
777  if (AV_RB32(b) == 0x52494646 &&
778  AV_RB32(b + 8) == 0x57454250)
779  return AVPROBE_SCORE_MAX - 1;
780  return 0;
781 }
782 
783 #define IMAGEAUTO_DEMUXER(imgname, codecid)\
784 static const AVClass imgname ## _class = {\
785  .class_name = AV_STRINGIFY(imgname) " demuxer",\
786  .item_name = av_default_item_name,\
787  .option = ff_img_options,\
788  .version = LIBAVUTIL_VERSION_INT,\
789 };\
790 AVInputFormat ff_image_ ## imgname ## _pipe_demuxer = {\
791  .name = AV_STRINGIFY(imgname) "_pipe",\
792  .long_name = NULL_IF_CONFIG_SMALL("piped " AV_STRINGIFY(imgname) " sequence"),\
793  .priv_data_size = sizeof(VideoDemuxData),\
794  .read_probe = imgname ## _probe,\
795  .read_header = ff_img_read_header,\
796  .read_packet = ff_img_read_packet,\
797  .priv_class = & imgname ## _class,\
798  .flags = AVFMT_GENERIC_INDEX, \
799  .raw_codec_id = codecid,\
800 };
801