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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 
158 static int img_read_probe(AVProbeData *p)
159 {
160  if (p->filename && ff_guess_image2_codec(p->filename)) {
161  if (av_filename_number_test(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
172  return AVPROBE_SCORE_EXTENSION;
173  }
174  return 0;
175 }
176 
177 int ff_img_read_header(AVFormatContext *s1)
178 {
179  VideoDemuxData *s = s1->priv_data;
180  int first_index, last_index;
181  AVStream *st;
182  enum AVPixelFormat pix_fmt = AV_PIX_FMT_NONE;
183 
184  s1->ctx_flags |= AVFMTCTX_NOHEADER;
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;
207  st->need_parsing = AVSTREAM_PARSE_FULL;
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
219  avpriv_set_pts_info(st, 64, s->framerate.den, s->framerate.num);
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) {
301  st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
302  st->codec->codec_id = s1->video_codec_id;
303  } else if (s1->audio_codec_id) {
304  st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
305  st->codec->codec_id = s1->audio_codec_id;
306  } else if (s1->iformat->raw_codec_id) {
307  st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
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");
312  st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
313  if (s1->pb) {
314  int probe_buffer_size = 2048;
315  uint8_t *probe_buffer = av_realloc(NULL, probe_buffer_size + AVPROBE_PADDING_SIZE);
316  AVInputFormat *fmt = NULL;
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  ffio_rewind_with_probe_data(s1->pb, &probe_buffer, probe_buffer_size);
345  }
346  if (st->codec->codec_id == AV_CODEC_ID_NONE)
347  st->codec->codec_id = ff_guess_image2_codec(s->path);
348  if (st->codec->codec_id == AV_CODEC_ID_LJPEG)
349  st->codec->codec_id = AV_CODEC_ID_MJPEG;
350  if (st->codec->codec_id == AV_CODEC_ID_ALIAS_PIX) // we cannot distingiush this from BRENDER_PIX
351  st->codec->codec_id = AV_CODEC_ID_NONE;
352  }
353  if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
354  pix_fmt != AV_PIX_FMT_NONE)
355  st->codec->pix_fmt = pix_fmt;
356 
357  return 0;
358 }
359 
360 int ff_img_read_packet(AVFormatContext *s1, AVPacket *pkt)
361 {
362  VideoDemuxData *s = s1->priv_data;
363  char filename_bytes[1024];
364  char *filename = filename_bytes;
365  int i, res;
366  int size[3] = { 0 }, ret[3] = { 0 };
367  AVIOContext *f[3] = { NULL };
368  AVCodecContext *codec = s1->streams[0]->codec;
369 
370  if (!s->is_pipe) {
371  /* loop over input */
372  if (s->loop && s->img_number > s->img_last) {
373  s->img_number = s->img_first;
374  }
375  if (s->img_number > s->img_last)
376  return AVERROR_EOF;
377  if (s->use_glob) {
378 #if HAVE_GLOB
379  filename = s->globstate.gl_pathv[s->img_number];
380 #endif
381  } else {
382  if (av_get_frame_filename(filename_bytes, sizeof(filename_bytes),
383  s->path,
384  s->img_number) < 0 && s->img_number > 1)
385  return AVERROR(EIO);
386  }
387  for (i = 0; i < 3; i++) {
388  if (avio_open2(&f[i], filename, AVIO_FLAG_READ,
389  &s1->interrupt_callback, NULL) < 0) {
390  if (i >= 1)
391  break;
392  av_log(s1, AV_LOG_ERROR, "Could not open file : %s\n",
393  filename);
394  return AVERROR(EIO);
395  }
396  size[i] = avio_size(f[i]);
397 
398  if (!s->split_planes)
399  break;
400  filename[strlen(filename) - 1] = 'U' + i;
401  }
402 
403  if (codec->codec_id == AV_CODEC_ID_NONE) {
404  AVProbeData pd = { 0 };
405  AVInputFormat *ifmt;
406  uint8_t header[PROBE_BUF_MIN + AVPROBE_PADDING_SIZE];
407  int ret;
408  int score = 0;
409 
410  ret = avio_read(f[0], header, PROBE_BUF_MIN);
411  if (ret < 0)
412  return ret;
413  memset(header + ret, 0, sizeof(header) - ret);
414  avio_skip(f[0], -ret);
415  pd.buf = header;
416  pd.buf_size = ret;
417  pd.filename = filename;
418 
419  ifmt = av_probe_input_format3(&pd, 1, &score);
420  if (ifmt && ifmt->read_packet == ff_img_read_packet && ifmt->raw_codec_id)
421  codec->codec_id = ifmt->raw_codec_id;
422  }
423 
424  if (codec->codec_id == AV_CODEC_ID_RAWVIDEO && !codec->width)
425  infer_size(&codec->width, &codec->height, size[0]);
426  } else {
427  f[0] = s1->pb;
428  if (avio_feof(f[0]) && s->loop && s->is_pipe)
429  avio_seek(f[0], 0, SEEK_SET);
430  if (avio_feof(f[0]))
431  return AVERROR_EOF;
432  if (s->frame_size > 0) {
433  size[0] = s->frame_size;
434  } else if (!s1->streams[0]->parser) {
435  size[0] = avio_size(s1->pb);
436  } else {
437  size[0] = 4096;
438  }
439  }
440 
441  res = av_new_packet(pkt, size[0] + size[1] + size[2]);
442  if (res < 0)
443  return res;
444  pkt->stream_index = 0;
445  pkt->flags |= AV_PKT_FLAG_KEY;
446  if (s->ts_from_file) {
447  struct stat img_stat;
448  if (stat(filename, &img_stat))
449  return AVERROR(EIO);
450  pkt->pts = (int64_t)img_stat.st_mtime;
451 #if HAVE_STRUCT_STAT_ST_MTIM_TV_NSEC
452  if (s->ts_from_file == 2)
453  pkt->pts = 1000000000*pkt->pts + img_stat.st_mtim.tv_nsec;
454 #endif
455  av_add_index_entry(s1->streams[0], s->img_number, pkt->pts, 0, 0, AVINDEX_KEYFRAME);
456  } else if (!s->is_pipe) {
457  pkt->pts = s->pts;
458  }
459 
460  if (s->is_pipe)
461  pkt->pos = avio_tell(f[0]);
462 
463  pkt->size = 0;
464  for (i = 0; i < 3; i++) {
465  if (f[i]) {
466  ret[i] = avio_read(f[i], pkt->data + pkt->size, size[i]);
467  if (s->loop && s->is_pipe && ret[i] == AVERROR_EOF) {
468  if (avio_seek(f[i], 0, SEEK_SET) >= 0) {
469  pkt->pos = 0;
470  ret[i] = avio_read(f[i], pkt->data + pkt->size, size[i]);
471  }
472  }
473  if (!s->is_pipe)
474  avio_closep(&f[i]);
475  if (ret[i] > 0)
476  pkt->size += ret[i];
477  }
478  }
479 
480  if (ret[0] <= 0 || ret[1] < 0 || ret[2] < 0) {
481  av_free_packet(pkt);
482  if (ret[0] < 0) {
483  return ret[0];
484  } else if (ret[1] < 0) {
485  return ret[1];
486  } else if (ret[2] < 0)
487  return ret[2];
488  return AVERROR_EOF;
489  } else {
490  s->img_count++;
491  s->img_number++;
492  s->pts++;
493  return 0;
494  }
495 }
496 
497 static int img_read_close(struct AVFormatContext* s1)
498 {
499 #if HAVE_GLOB
500  VideoDemuxData *s = s1->priv_data;
501  if (s->use_glob) {
502  globfree(&s->globstate);
503  }
504 #endif
505  return 0;
506 }
507 
508 static int img_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
509 {
510  VideoDemuxData *s1 = s->priv_data;
511  AVStream *st = s->streams[0];
512 
513  if (s1->ts_from_file) {
514  int index = av_index_search_timestamp(st, timestamp, flags);
515  if(index < 0)
516  return -1;
517  s1->img_number = st->index_entries[index].pos;
518  return 0;
519  }
520 
521  if (timestamp < 0 || !s1->loop && timestamp > s1->img_last - s1->img_first)
522  return -1;
523  s1->img_number = timestamp%(s1->img_last - s1->img_first + 1) + s1->img_first;
524  s1->pts = timestamp;
525  return 0;
526 }
527 
528 #define OFFSET(x) offsetof(VideoDemuxData, x)
529 #define DEC AV_OPT_FLAG_DECODING_PARAM
530 const AVOption ff_img_options[] = {
531  { "framerate", "set the video framerate", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, 0, DEC },
532  { "loop", "force loop over input file sequence", OFFSET(loop), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 1, DEC },
533 
534  { "pattern_type", "set pattern type", OFFSET(pattern_type), AV_OPT_TYPE_INT, {.i64=PT_GLOB_SEQUENCE}, 0, INT_MAX, DEC, "pattern_type"},
535  { "glob_sequence","select glob/sequence pattern type", 0, AV_OPT_TYPE_CONST, {.i64=PT_GLOB_SEQUENCE}, INT_MIN, INT_MAX, DEC, "pattern_type" },
536  { "glob", "select glob pattern type", 0, AV_OPT_TYPE_CONST, {.i64=PT_GLOB }, INT_MIN, INT_MAX, DEC, "pattern_type" },
537  { "sequence", "select sequence pattern type", 0, AV_OPT_TYPE_CONST, {.i64=PT_SEQUENCE }, INT_MIN, INT_MAX, DEC, "pattern_type" },
538 
539  { "pixel_format", "set video pixel format", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
540  { "start_number", "set first number in the sequence", OFFSET(start_number), AV_OPT_TYPE_INT, {.i64 = 0 }, INT_MIN, INT_MAX, DEC },
541  { "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 },
542  { "video_size", "set video size", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, DEC },
543  { "frame_size", "force frame size in bytes", OFFSET(frame_size), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, DEC },
544  { "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" },
545  { "none", "none", 0, AV_OPT_TYPE_CONST, {.i64 = 0 }, 0, 2, DEC, "ts_type" },
546  { "sec", "second precision", 0, AV_OPT_TYPE_CONST, {.i64 = 1 }, 0, 2, DEC, "ts_type" },
547  { "ns", "nano second precision", 0, AV_OPT_TYPE_CONST, {.i64 = 2 }, 0, 2, DEC, "ts_type" },
548  { NULL },
549 };
550 
551 #if CONFIG_IMAGE2_DEMUXER
552 static const AVClass img2_class = {
553  .class_name = "image2 demuxer",
554  .item_name = av_default_item_name,
555  .option = ff_img_options,
556  .version = LIBAVUTIL_VERSION_INT,
557 };
558 AVInputFormat ff_image2_demuxer = {
559  .name = "image2",
560  .long_name = NULL_IF_CONFIG_SMALL("image2 sequence"),
561  .priv_data_size = sizeof(VideoDemuxData),
562  .read_probe = img_read_probe,
563  .read_header = ff_img_read_header,
564  .read_packet = ff_img_read_packet,
565  .read_close = img_read_close,
566  .read_seek = img_read_seek,
567  .flags = AVFMT_NOFILE,
568  .priv_class = &img2_class,
569 };
570 #endif
571 #if CONFIG_IMAGE2PIPE_DEMUXER
572 static const AVClass img2pipe_class = {
573  .class_name = "image2pipe demuxer",
574  .item_name = av_default_item_name,
575  .option = ff_img_options,
576  .version = LIBAVUTIL_VERSION_INT,
577 };
578 AVInputFormat ff_image2pipe_demuxer = {
579  .name = "image2pipe",
580  .long_name = NULL_IF_CONFIG_SMALL("piped image2 sequence"),
581  .priv_data_size = sizeof(VideoDemuxData),
582  .read_header = ff_img_read_header,
583  .read_packet = ff_img_read_packet,
584  .priv_class = &img2pipe_class,
585 };
586 #endif
587 
588 static int bmp_probe(AVProbeData *p)
589 {
590  const uint8_t *b = p->buf;
591  int ihsize;
592 
593  if (AV_RB16(b) != 0x424d)
594  return 0;
595 
596  ihsize = AV_RL32(b+14);
597  if (ihsize < 12 || ihsize > 255)
598  return 0;
599 
600  if (!AV_RN32(b + 6)) {
601  return AVPROBE_SCORE_EXTENSION + 1;
602  }
603  return AVPROBE_SCORE_EXTENSION / 4;
604 }
605 
606 static int dpx_probe(AVProbeData *p)
607 {
608  const uint8_t *b = p->buf;
609  int w, h;
610  int is_big = (AV_RN32(b) == AV_RN32("SDPX"));
611 
612  if (p->buf_size < 0x304+8)
613  return 0;
614  w = is_big ? AV_RB32(p->buf + 0x304) : AV_RL32(p->buf + 0x304);
615  h = is_big ? AV_RB32(p->buf + 0x308) : AV_RL32(p->buf + 0x308);
616  if (w <= 0 || h <= 0)
617  return 0;
618 
619  if (is_big || AV_RN32(b) == AV_RN32("XPDS"))
620  return AVPROBE_SCORE_EXTENSION + 1;
621  return 0;
622 }
623 
624 static int exr_probe(AVProbeData *p)
625 {
626  const uint8_t *b = p->buf;
627 
628  if (AV_RL32(b) == 20000630)
629  return AVPROBE_SCORE_EXTENSION + 1;
630  return 0;
631 }
632 
633 static int j2k_probe(AVProbeData *p)
634 {
635  const uint8_t *b = p->buf;
636 
637  if (AV_RB64(b) == 0x0000000c6a502020 ||
638  AV_RB32(b) == 0xff4fff51)
639  return AVPROBE_SCORE_EXTENSION + 1;
640  return 0;
641 }
642 
643 static int jpeg_probe(AVProbeData *p)
644 {
645  const uint8_t *b = p->buf;
646  int i, state = 0xD8, exif_size = 0;
647 
648  if (AV_RB16(b) != 0xFFD8 ||
649  AV_RB32(b) == 0xFFD8FFF7)
650  return 0;
651 
652  b += 2;
653  if (AV_RB16(b) == 0xFFE1 && AV_RB32(b + 4) == AV_RB32("Exif")) {
654  exif_size = AV_RB16(b + 2) + 2;
655  b += exif_size;
656  }
657  for (i = 0; i + exif_size < p->buf_size - 2; i++) {
658  int c;
659  if (b[i] != 0xFF)
660  continue;
661  c = b[i + 1];
662  switch (c) {
663  case 0xD8:
664  return 0;
665  case 0xC0:
666  case 0xC1:
667  case 0xC2:
668  case 0xC3:
669  case 0xC5:
670  case 0xC6:
671  case 0xC7:
672  if (state != 0xD8)
673  return 0;
674  state = 0xC0;
675  break;
676  case 0xDA:
677  if (state != 0xC0)
678  return 0;
679  state = 0xDA;
680  break;
681  case 0xD9:
682  if (state != 0xDA)
683  return 0;
684  state = 0xD9;
685  break;
686  default:
687  if ( (c >= 0x02 && c <= 0xBF)
688  || c == 0xC8)
689  return 0;
690  }
691  }
692 
693  if (state == 0xD9)
694  return AVPROBE_SCORE_EXTENSION + 1;
695  return AVPROBE_SCORE_EXTENSION / 8;
696 }
697 
698 static int jpegls_probe(AVProbeData *p)
699 {
700  const uint8_t *b = p->buf;
701 
702  if (AV_RB32(b) == 0xffd8fff7)
703  return AVPROBE_SCORE_EXTENSION + 1;
704  return 0;
705 }
706 
707 static int pictor_probe(AVProbeData *p)
708 {
709  const uint8_t *b = p->buf;
710 
711  if (AV_RL16(b) == 0x1234)
712  return AVPROBE_SCORE_EXTENSION / 4;
713  return 0;
714 }
715 
716 static int png_probe(AVProbeData *p)
717 {
718  const uint8_t *b = p->buf;
719 
720  if (AV_RB64(b) == 0x89504e470d0a1a0a)
721  return AVPROBE_SCORE_MAX - 1;
722  return 0;
723 }
724 
725 static int sgi_probe(AVProbeData *p)
726 {
727  const uint8_t *b = p->buf;
728 
729  if (AV_RB16(b) == 474 &&
730  (b[2] & ~1) == 0 &&
731  (b[3] & ~3) == 0 && b[3] &&
732  (AV_RB16(b + 4) & ~7) == 0 && AV_RB16(b + 4))
733  return AVPROBE_SCORE_EXTENSION + 1;
734  return 0;
735 }
736 
737 static int sunrast_probe(AVProbeData *p)
738 {
739  const uint8_t *b = p->buf;
740 
741  if (AV_RB32(b) == 0x59a66a95)
742  return AVPROBE_SCORE_EXTENSION + 1;
743  return 0;
744 }
745 
746 static int tiff_probe(AVProbeData *p)
747 {
748  const uint8_t *b = p->buf;
749 
750  if (AV_RB32(b) == 0x49492a00 ||
751  AV_RB32(b) == 0x4D4D002a)
752  return AVPROBE_SCORE_EXTENSION + 1;
753  return 0;
754 }
755 
756 static int webp_probe(AVProbeData *p)
757 {
758  const uint8_t *b = p->buf;
759 
760  if (AV_RB32(b) == 0x52494646 &&
761  AV_RB32(b + 8) == 0x57454250)
762  return AVPROBE_SCORE_MAX - 1;
763  return 0;
764 }
765 
766 #define IMAGEAUTO_DEMUXER(imgname, codecid)\
767 static const AVClass imgname ## _class = {\
768  .class_name = AV_STRINGIFY(imgname) " demuxer",\
769  .item_name = av_default_item_name,\
770  .option = ff_img_options,\
771  .version = LIBAVUTIL_VERSION_INT,\
772 };\
773 AVInputFormat ff_image_ ## imgname ## _pipe_demuxer = {\
774  .name = AV_STRINGIFY(imgname) "_pipe",\
775  .long_name = NULL_IF_CONFIG_SMALL("piped " AV_STRINGIFY(imgname) " sequence"),\
776  .priv_data_size = sizeof(VideoDemuxData),\
777  .read_probe = imgname ## _probe,\
778  .read_header = ff_img_read_header,\
779  .read_packet = ff_img_read_packet,\
780  .priv_class = & imgname ## _class,\
781  .flags = AVFMT_GENERIC_INDEX, \
782  .raw_codec_id = codecid,\
783 };
784 
785 IMAGEAUTO_DEMUXER(bmp, AV_CODEC_ID_BMP)
786 IMAGEAUTO_DEMUXER(dpx, AV_CODEC_ID_DPX)
787 IMAGEAUTO_DEMUXER(exr, AV_CODEC_ID_EXR)
788 IMAGEAUTO_DEMUXER(j2k, AV_CODEC_ID_JPEG2000)
789 IMAGEAUTO_DEMUXER(jpeg, AV_CODEC_ID_MJPEG)
790 IMAGEAUTO_DEMUXER(jpegls, AV_CODEC_ID_JPEGLS)
791 IMAGEAUTO_DEMUXER(pictor, AV_CODEC_ID_PICTOR)
792 IMAGEAUTO_DEMUXER(png, AV_CODEC_ID_PNG)
793 IMAGEAUTO_DEMUXER(sgi, AV_CODEC_ID_SGI)
794 IMAGEAUTO_DEMUXER(sunrast, AV_CODEC_ID_SUNRAST)
795 IMAGEAUTO_DEMUXER(tiff, AV_CODEC_ID_TIFF)
796 IMAGEAUTO_DEMUXER(webp, AV_CODEC_ID_WEBP)
Generated on Sun Mar 8 2015 02:35:09 for FFmpeg by   doxygen 1.8.2