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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->buf_size == 0)
166  return 0;
167  else if (av_match_ext(p->filename, "raw") || av_match_ext(p->filename, "gif"))
168  return 5;
169  else
170  return AVPROBE_SCORE_EXTENSION;
171  }
172  return 0;
173 }
174 
175 int ff_img_read_header(AVFormatContext *s1)
176 {
177  VideoDemuxData *s = s1->priv_data;
178  int first_index, last_index;
179  AVStream *st;
180  enum AVPixelFormat pix_fmt = AV_PIX_FMT_NONE;
181 
182  s1->ctx_flags |= AVFMTCTX_NOHEADER;
183 
184  st = avformat_new_stream(s1, NULL);
185  if (!st) {
186  return AVERROR(ENOMEM);
187  }
188 
189  if (s->pixel_format &&
190  (pix_fmt = av_get_pix_fmt(s->pixel_format)) == AV_PIX_FMT_NONE) {
191  av_log(s1, AV_LOG_ERROR, "No such pixel format: %s.\n",
192  s->pixel_format);
193  return AVERROR(EINVAL);
194  }
195 
196  av_strlcpy(s->path, s1->filename, sizeof(s->path));
197  s->img_number = 0;
198  s->img_count = 0;
199 
200  /* find format */
201  if (s1->iformat->flags & AVFMT_NOFILE)
202  s->is_pipe = 0;
203  else {
204  s->is_pipe = 1;
205  st->need_parsing = AVSTREAM_PARSE_FULL;
206  }
207 
208  if (s->ts_from_file == 2) {
209 #if !HAVE_STRUCT_STAT_ST_MTIM_TV_NSEC
210  av_log(s1, AV_LOG_ERROR, "POSIX.1-2008 not supported, nanosecond file timestamps unavailable\n");
211  return AVERROR(ENOSYS);
212 #endif
213  avpriv_set_pts_info(st, 64, 1, 1000000000);
214  } else if (s->ts_from_file)
215  avpriv_set_pts_info(st, 64, 1, 1);
216  else
217  avpriv_set_pts_info(st, 64, s->framerate.den, s->framerate.num);
218 
219  if (s->width && s->height) {
220  st->codec->width = s->width;
221  st->codec->height = s->height;
222  }
223 
224  if (!s->is_pipe) {
225  if (s->pattern_type == PT_GLOB_SEQUENCE) {
226  s->use_glob = is_glob(s->path);
227  if (s->use_glob) {
228  char *p = s->path, *q, *dup;
229  int gerr;
230 
231  av_log(s1, AV_LOG_WARNING, "Pattern type 'glob_sequence' is deprecated: "
232  "use pattern_type 'glob' instead\n");
233 #if HAVE_GLOB
234  dup = q = av_strdup(p);
235  while (*q) {
236  /* Do we have room for the next char and a \ insertion? */
237  if ((p - s->path) >= (sizeof(s->path) - 2))
238  break;
239  if (*q == '%' && strspn(q + 1, "%*?[]{}"))
240  ++q;
241  else if (strspn(q, "\\*?[]{}"))
242  *p++ = '\\';
243  *p++ = *q++;
244  }
245  *p = 0;
246  av_free(dup);
247 
248  gerr = glob(s->path, GLOB_NOCHECK|GLOB_BRACE|GLOB_NOMAGIC, NULL, &s->globstate);
249  if (gerr != 0) {
250  return AVERROR(ENOENT);
251  }
252  first_index = 0;
253  last_index = s->globstate.gl_pathc - 1;
254 #endif
255  }
256  }
257  if ((s->pattern_type == PT_GLOB_SEQUENCE && !s->use_glob) || s->pattern_type == PT_SEQUENCE) {
258  if (find_image_range(&first_index, &last_index, s->path,
259  s->start_number, s->start_number_range) < 0) {
260  av_log(s1, AV_LOG_ERROR,
261  "Could find no file with path '%s' and index in the range %d-%d\n",
262  s->path, s->start_number, s->start_number + s->start_number_range - 1);
263  return AVERROR(ENOENT);
264  }
265  } else if (s->pattern_type == PT_GLOB) {
266 #if HAVE_GLOB
267  int gerr;
268  gerr = glob(s->path, GLOB_NOCHECK|GLOB_BRACE|GLOB_NOMAGIC, NULL, &s->globstate);
269  if (gerr != 0) {
270  return AVERROR(ENOENT);
271  }
272  first_index = 0;
273  last_index = s->globstate.gl_pathc - 1;
274  s->use_glob = 1;
275 #else
276  av_log(s1, AV_LOG_ERROR,
277  "Pattern type 'glob' was selected but globbing "
278  "is not supported by this libavformat build\n");
279  return AVERROR(ENOSYS);
280 #endif
281  } else if (s->pattern_type != PT_GLOB_SEQUENCE) {
282  av_log(s1, AV_LOG_ERROR,
283  "Unknown value '%d' for pattern_type option\n", s->pattern_type);
284  return AVERROR(EINVAL);
285  }
286  s->img_first = first_index;
287  s->img_last = last_index;
288  s->img_number = first_index;
289  /* compute duration */
290  if (!s->ts_from_file) {
291  st->start_time = 0;
292  st->duration = last_index - first_index + 1;
293  }
294  }
295 
296  if (s1->video_codec_id) {
297  st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
298  st->codec->codec_id = s1->video_codec_id;
299  } else if (s1->audio_codec_id) {
300  st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
301  st->codec->codec_id = s1->audio_codec_id;
302  } else if (s1->iformat->raw_codec_id) {
303  st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
304  st->codec->codec_id = s1->iformat->raw_codec_id;
305  } else {
306  const char *str = strrchr(s->path, '.');
307  s->split_planes = str && !av_strcasecmp(str + 1, "y");
308  st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
309  if (s1->pb) {
310  int probe_buffer_size = 2048;
311  uint8_t *probe_buffer = av_realloc(NULL, probe_buffer_size + AVPROBE_PADDING_SIZE);
312  AVInputFormat *fmt = NULL;
313  AVProbeData pd = { 0 };
314 
315  if (!probe_buffer)
316  return AVERROR(ENOMEM);
317 
318  probe_buffer_size = avio_read(s1->pb, probe_buffer, probe_buffer_size);
319  if (probe_buffer_size < 0) {
320  av_free(probe_buffer);
321  return probe_buffer_size;
322  }
323  memset(probe_buffer + probe_buffer_size, 0, AVPROBE_PADDING_SIZE);
324 
325  pd.buf = probe_buffer;
326  pd.buf_size = probe_buffer_size;
327  pd.filename = s1->filename;
328 
329  while ((fmt = av_iformat_next(fmt))) {
330  if (fmt->read_header != ff_img_read_header ||
331  !fmt->read_probe ||
332  (fmt->flags & AVFMT_NOFILE) ||
333  !fmt->raw_codec_id)
334  continue;
335  if (fmt->read_probe(&pd) > 0) {
336  st->codec->codec_id = fmt->raw_codec_id;
337  break;
338  }
339  }
340  ffio_rewind_with_probe_data(s1->pb, &probe_buffer, probe_buffer_size);
341  }
342  if (st->codec->codec_id == AV_CODEC_ID_NONE)
343  st->codec->codec_id = ff_guess_image2_codec(s->path);
344  if (st->codec->codec_id == AV_CODEC_ID_LJPEG)
345  st->codec->codec_id = AV_CODEC_ID_MJPEG;
346  if (st->codec->codec_id == AV_CODEC_ID_ALIAS_PIX) // we cannot distingiush this from BRENDER_PIX
347  st->codec->codec_id = AV_CODEC_ID_NONE;
348  }
349  if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
350  pix_fmt != AV_PIX_FMT_NONE)
351  st->codec->pix_fmt = pix_fmt;
352 
353  return 0;
354 }
355 
356 int ff_img_read_packet(AVFormatContext *s1, AVPacket *pkt)
357 {
358  VideoDemuxData *s = s1->priv_data;
359  char filename_bytes[1024];
360  char *filename = filename_bytes;
361  int i;
362  int size[3] = { 0 }, ret[3] = { 0 };
363  AVIOContext *f[3] = { NULL };
364  AVCodecContext *codec = s1->streams[0]->codec;
365 
366  if (!s->is_pipe) {
367  /* loop over input */
368  if (s->loop && s->img_number > s->img_last) {
369  s->img_number = s->img_first;
370  }
371  if (s->img_number > s->img_last)
372  return AVERROR_EOF;
373  if (s->use_glob) {
374 #if HAVE_GLOB
375  filename = s->globstate.gl_pathv[s->img_number];
376 #endif
377  } else {
378  if (av_get_frame_filename(filename_bytes, sizeof(filename_bytes),
379  s->path,
380  s->img_number) < 0 && s->img_number > 1)
381  return AVERROR(EIO);
382  }
383  for (i = 0; i < 3; i++) {
384  if (avio_open2(&f[i], filename, AVIO_FLAG_READ,
385  &s1->interrupt_callback, NULL) < 0) {
386  if (i >= 1)
387  break;
388  av_log(s1, AV_LOG_ERROR, "Could not open file : %s\n",
389  filename);
390  return AVERROR(EIO);
391  }
392  size[i] = avio_size(f[i]);
393 
394  if (!s->split_planes)
395  break;
396  filename[strlen(filename) - 1] = 'U' + i;
397  }
398 
399  if (codec->codec_id == AV_CODEC_ID_NONE) {
400  AVProbeData pd = { 0 };
401  AVInputFormat *ifmt;
402  uint8_t header[PROBE_BUF_MIN + AVPROBE_PADDING_SIZE];
403  int ret;
404  int score = 0;
405 
406  ret = avio_read(f[0], header, PROBE_BUF_MIN);
407  if (ret < 0)
408  return ret;
409  memset(header + ret, 0, sizeof(header) - ret);
410  avio_skip(f[0], -ret);
411  pd.buf = header;
412  pd.buf_size = ret;
413  pd.filename = filename;
414 
415  ifmt = av_probe_input_format3(&pd, 1, &score);
416  if (ifmt && ifmt->read_packet == ff_img_read_packet && ifmt->raw_codec_id)
417  codec->codec_id = ifmt->raw_codec_id;
418  }
419 
420  if (codec->codec_id == AV_CODEC_ID_RAWVIDEO && !codec->width)
421  infer_size(&codec->width, &codec->height, size[0]);
422  } else {
423  f[0] = s1->pb;
424  if (avio_feof(f[0]))
425  return AVERROR(EIO);
426  if (s->frame_size > 0) {
427  size[0] = s->frame_size;
428  } else if (!s1->streams[0]->parser) {
429  size[0] = avio_size(s1->pb);
430  } else {
431  size[0] = 4096;
432  }
433  }
434 
435  if (av_new_packet(pkt, size[0] + size[1] + size[2]) < 0)
436  return AVERROR(ENOMEM);
437  pkt->stream_index = 0;
438  pkt->flags |= AV_PKT_FLAG_KEY;
439  if (s->ts_from_file) {
440  struct stat img_stat;
441  if (stat(filename, &img_stat))
442  return AVERROR(EIO);
443  pkt->pts = (int64_t)img_stat.st_mtime;
444 #if HAVE_STRUCT_STAT_ST_MTIM_TV_NSEC
445  if (s->ts_from_file == 2)
446  pkt->pts = 1000000000*pkt->pts + img_stat.st_mtim.tv_nsec;
447 #endif
448  av_add_index_entry(s1->streams[0], s->img_number, pkt->pts, 0, 0, AVINDEX_KEYFRAME);
449  } else if (!s->is_pipe) {
450  pkt->pts = s->pts;
451  }
452 
453  pkt->size = 0;
454  for (i = 0; i < 3; i++) {
455  if (f[i]) {
456  ret[i] = avio_read(f[i], pkt->data + pkt->size, size[i]);
457  if (!s->is_pipe)
458  avio_close(f[i]);
459  if (ret[i] > 0)
460  pkt->size += ret[i];
461  }
462  }
463 
464  if (ret[0] <= 0 || ret[1] < 0 || ret[2] < 0) {
465  av_free_packet(pkt);
466  return AVERROR(EIO); /* signal EOF */
467  } else {
468  s->img_count++;
469  s->img_number++;
470  s->pts++;
471  return 0;
472  }
473 }
474 
475 static int img_read_close(struct AVFormatContext* s1)
476 {
477  VideoDemuxData *s = s1->priv_data;
478 #if HAVE_GLOB
479  if (s->use_glob) {
480  globfree(&s->globstate);
481  }
482 #endif
483  return 0;
484 }
485 
486 static int img_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
487 {
488  VideoDemuxData *s1 = s->priv_data;
489  AVStream *st = s->streams[0];
490 
491  if (s1->ts_from_file) {
492  int index = av_index_search_timestamp(st, timestamp, flags);
493  if(index < 0)
494  return -1;
495  s1->img_number = st->index_entries[index].pos;
496  return 0;
497  }
498 
499  if (timestamp < 0 || !s1->loop && timestamp > s1->img_last - s1->img_first)
500  return -1;
501  s1->img_number = timestamp%(s1->img_last - s1->img_first + 1) + s1->img_first;
502  s1->pts = timestamp;
503  return 0;
504 }
505 
506 #define OFFSET(x) offsetof(VideoDemuxData, x)
507 #define DEC AV_OPT_FLAG_DECODING_PARAM
508 const AVOption ff_img_options[] = {
509  { "framerate", "set the video framerate", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, 0, DEC },
510  { "loop", "force loop over input file sequence", OFFSET(loop), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 1, DEC },
511 
512  { "pattern_type", "set pattern type", OFFSET(pattern_type), AV_OPT_TYPE_INT, {.i64=PT_GLOB_SEQUENCE}, 0, INT_MAX, DEC, "pattern_type"},
513  { "glob_sequence","select glob/sequence pattern type", 0, AV_OPT_TYPE_CONST, {.i64=PT_GLOB_SEQUENCE}, INT_MIN, INT_MAX, DEC, "pattern_type" },
514  { "glob", "select glob pattern type", 0, AV_OPT_TYPE_CONST, {.i64=PT_GLOB }, INT_MIN, INT_MAX, DEC, "pattern_type" },
515  { "sequence", "select sequence pattern type", 0, AV_OPT_TYPE_CONST, {.i64=PT_SEQUENCE }, INT_MIN, INT_MAX, DEC, "pattern_type" },
516 
517  { "pixel_format", "set video pixel format", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
518  { "start_number", "set first number in the sequence", OFFSET(start_number), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, DEC },
519  { "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 },
520  { "video_size", "set video size", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, DEC },
521  { "frame_size", "force frame size in bytes", OFFSET(frame_size), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, DEC },
522  { "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" },
523  { "none", "none", 0, AV_OPT_TYPE_CONST, {.i64 = 0 }, 0, 2, DEC, "ts_type" },
524  { "sec", "second precision", 0, AV_OPT_TYPE_CONST, {.i64 = 1 }, 0, 2, DEC, "ts_type" },
525  { "ns", "nano second precision", 0, AV_OPT_TYPE_CONST, {.i64 = 2 }, 0, 2, DEC, "ts_type" },
526  { NULL },
527 };
528 
529 #if CONFIG_IMAGE2_DEMUXER
530 static const AVClass img2_class = {
531  .class_name = "image2 demuxer",
532  .item_name = av_default_item_name,
533  .option = ff_img_options,
534  .version = LIBAVUTIL_VERSION_INT,
535 };
536 AVInputFormat ff_image2_demuxer = {
537  .name = "image2",
538  .long_name = NULL_IF_CONFIG_SMALL("image2 sequence"),
539  .priv_data_size = sizeof(VideoDemuxData),
540  .read_probe = img_read_probe,
541  .read_header = ff_img_read_header,
542  .read_packet = ff_img_read_packet,
543  .read_close = img_read_close,
544  .read_seek = img_read_seek,
545  .flags = AVFMT_NOFILE,
546  .priv_class = &img2_class,
547 };
548 #endif
549 #if CONFIG_IMAGE2PIPE_DEMUXER
550 static const AVClass img2pipe_class = {
551  .class_name = "image2pipe demuxer",
552  .item_name = av_default_item_name,
553  .option = ff_img_options,
554  .version = LIBAVUTIL_VERSION_INT,
555 };
556 AVInputFormat ff_image2pipe_demuxer = {
557  .name = "image2pipe",
558  .long_name = NULL_IF_CONFIG_SMALL("piped image2 sequence"),
559  .priv_data_size = sizeof(VideoDemuxData),
560  .read_header = ff_img_read_header,
561  .read_packet = ff_img_read_packet,
562  .priv_class = &img2pipe_class,
563 };
564 #endif
565 
566 static int bmp_probe(AVProbeData *p)
567 {
568  const uint8_t *b = p->buf;
569  int ihsize;
570 
571  if (AV_RB16(b) != 0x424d)
572  return 0;
573 
574  ihsize = AV_RL32(b+14);
575  if (ihsize < 12 || ihsize > 255)
576  return 0;
577 
578  if (!AV_RN32(b + 6)) {
579  return AVPROBE_SCORE_EXTENSION - 1; // lower than extension as bmp pipe has bugs
580  } else {
581  return AVPROBE_SCORE_EXTENSION / 4;
582  }
583  return 0;
584 }
585 
586 static int dpx_probe(AVProbeData *p)
587 {
588  const uint8_t *b = p->buf;
589 
590  if (AV_RN32(b) == AV_RN32("SDPX") || AV_RN32(b) == AV_RN32("XPDS"))
591  return AVPROBE_SCORE_EXTENSION + 1;
592  return 0;
593 }
594 
595 static int exr_probe(AVProbeData *p)
596 {
597  const uint8_t *b = p->buf;
598 
599  if (AV_RL32(b) == 20000630)
600  return AVPROBE_SCORE_EXTENSION + 1;
601  return 0;
602 }
603 
604 static int j2k_probe(AVProbeData *p)
605 {
606  const uint8_t *b = p->buf;
607 
608  if (AV_RB64(b) == 0x0000000c6a502020 ||
609  AV_RB32(b) == 0xff4fff51)
610  return AVPROBE_SCORE_EXTENSION + 1;
611  return 0;
612 }
613 
614 static int jpegls_probe(AVProbeData *p)
615 {
616  const uint8_t *b = p->buf;
617 
618  if (AV_RB32(b) == 0xffd8fff7)
619  return AVPROBE_SCORE_EXTENSION + 1;
620  return 0;
621 }
622 
623 static int pictor_probe(AVProbeData *p)
624 {
625  const uint8_t *b = p->buf;
626 
627  if (AV_RL16(b) == 0x1234)
628  return AVPROBE_SCORE_EXTENSION / 4;
629  return 0;
630 }
631 
632 static int png_probe(AVProbeData *p)
633 {
634  const uint8_t *b = p->buf;
635 
636  if (AV_RB64(b) == 0x89504e470d0a1a0a)
637  return AVPROBE_SCORE_MAX - 1;
638  return 0;
639 }
640 
641 static int sgi_probe(AVProbeData *p)
642 {
643  const uint8_t *b = p->buf;
644 
645  if (AV_RB16(b) == 474 &&
646  (b[2] & ~1) == 0 &&
647  (b[3] & ~3) == 0 && b[3] &&
648  (AV_RB16(b + 4) & ~7) == 0 && AV_RB16(b + 4))
649  return AVPROBE_SCORE_EXTENSION + 1;
650  return 0;
651 }
652 
653 static int sunrast_probe(AVProbeData *p)
654 {
655  const uint8_t *b = p->buf;
656 
657  if (AV_RB32(b) == 0x59a66a95)
658  return AVPROBE_SCORE_EXTENSION + 1;
659  return 0;
660 }
661 
662 static int tiff_probe(AVProbeData *p)
663 {
664  const uint8_t *b = p->buf;
665 
666  if (AV_RB32(b) == 0x49492a00 ||
667  AV_RB32(b) == 0x4D4D002a)
668  return AVPROBE_SCORE_EXTENSION + 1;
669  return 0;
670 }
671 
672 static int webp_probe(AVProbeData *p)
673 {
674  const uint8_t *b = p->buf;
675 
676  if (AV_RB32(b) == 0x52494646 &&
677  AV_RB32(b + 8) == 0x57454250)
678  return AVPROBE_SCORE_MAX - 1;
679  return 0;
680 }
681 
682 #define IMAGEAUTO_DEMUXER(imgname, codecid)\
683 static const AVClass imgname ## _class = {\
684  .class_name = AV_STRINGIFY(imgname) " demuxer",\
685  .item_name = av_default_item_name,\
686  .option = ff_img_options,\
687  .version = LIBAVUTIL_VERSION_INT,\
688 };\
689 AVInputFormat ff_image_ ## imgname ## _pipe_demuxer = {\
690  .name = AV_STRINGIFY(imgname) "_pipe",\
691  .long_name = NULL_IF_CONFIG_SMALL("piped " AV_STRINGIFY(imgname) " sequence"),\
692  .priv_data_size = sizeof(VideoDemuxData),\
693  .read_probe = imgname ## _probe,\
694  .read_header = ff_img_read_header,\
695  .read_packet = ff_img_read_packet,\
696  .priv_class = & imgname ## _class,\
697  .raw_codec_id = codecid,\
698 };
699 
700 IMAGEAUTO_DEMUXER(bmp, AV_CODEC_ID_BMP)
701 IMAGEAUTO_DEMUXER(dpx, AV_CODEC_ID_DPX)
702 IMAGEAUTO_DEMUXER(exr, AV_CODEC_ID_EXR)
703 IMAGEAUTO_DEMUXER(j2k, AV_CODEC_ID_JPEG2000)
704 IMAGEAUTO_DEMUXER(jpegls, AV_CODEC_ID_JPEGLS)
705 IMAGEAUTO_DEMUXER(pictor, AV_CODEC_ID_PICTOR)
706 IMAGEAUTO_DEMUXER(png, AV_CODEC_ID_PNG)
707 IMAGEAUTO_DEMUXER(sgi, AV_CODEC_ID_SGI)
708 IMAGEAUTO_DEMUXER(sunrast, AV_CODEC_ID_SUNRAST)
709 IMAGEAUTO_DEMUXER(tiff, AV_CODEC_ID_TIFF)
710 IMAGEAUTO_DEMUXER(webp, AV_CODEC_ID_WEBP)
Generated on Sun Sep 14 2014 18:56:12 for FFmpeg by   doxygen 1.8.2