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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 (av_match_ext(p->filename, "raw") || av_match_ext(p->filename, "gif"))
166  return 5;
167  else
168  return AVPROBE_SCORE_EXTENSION;
169  }
170  return 0;
171 }
172 
173 int ff_img_read_header(AVFormatContext *s1)
174 {
175  VideoDemuxData *s = s1->priv_data;
176  int first_index, last_index;
177  AVStream *st;
178  enum AVPixelFormat pix_fmt = AV_PIX_FMT_NONE;
179 
180  s1->ctx_flags |= AVFMTCTX_NOHEADER;
181 
182  st = avformat_new_stream(s1, NULL);
183  if (!st) {
184  return AVERROR(ENOMEM);
185  }
186 
187  if (s->pixel_format &&
188  (pix_fmt = av_get_pix_fmt(s->pixel_format)) == AV_PIX_FMT_NONE) {
189  av_log(s1, AV_LOG_ERROR, "No such pixel format: %s.\n",
190  s->pixel_format);
191  return AVERROR(EINVAL);
192  }
193 
194  av_strlcpy(s->path, s1->filename, sizeof(s->path));
195  s->img_number = 0;
196  s->img_count = 0;
197 
198  /* find format */
199  if (s1->iformat->flags & AVFMT_NOFILE)
200  s->is_pipe = 0;
201  else {
202  s->is_pipe = 1;
203  st->need_parsing = AVSTREAM_PARSE_FULL;
204  }
205 
206  if (s->ts_from_file == 2) {
207 #if !HAVE_STRUCT_STAT_ST_MTIM_TV_NSEC
208  av_log(s1, AV_LOG_ERROR, "POSIX.1-2008 not supported, nanosecond file timestamps unavailable\n");
209  return AVERROR(ENOSYS);
210 #endif
211  avpriv_set_pts_info(st, 64, 1, 1000000000);
212  } else if (s->ts_from_file)
213  avpriv_set_pts_info(st, 64, 1, 1);
214  else
215  avpriv_set_pts_info(st, 64, s->framerate.den, s->framerate.num);
216 
217  if (s->width && s->height) {
218  st->codec->width = s->width;
219  st->codec->height = s->height;
220  }
221 
222  if (!s->is_pipe) {
223  if (s->pattern_type == PT_GLOB_SEQUENCE) {
224  s->use_glob = is_glob(s->path);
225  if (s->use_glob) {
226  char *p = s->path, *q, *dup;
227  int gerr;
228 
229  av_log(s1, AV_LOG_WARNING, "Pattern type 'glob_sequence' is deprecated: "
230  "use pattern_type 'glob' instead\n");
231 #if HAVE_GLOB
232  dup = q = av_strdup(p);
233  while (*q) {
234  /* Do we have room for the next char and a \ insertion? */
235  if ((p - s->path) >= (sizeof(s->path) - 2))
236  break;
237  if (*q == '%' && strspn(q + 1, "%*?[]{}"))
238  ++q;
239  else if (strspn(q, "\\*?[]{}"))
240  *p++ = '\\';
241  *p++ = *q++;
242  }
243  *p = 0;
244  av_free(dup);
245 
246  gerr = glob(s->path, GLOB_NOCHECK|GLOB_BRACE|GLOB_NOMAGIC, NULL, &s->globstate);
247  if (gerr != 0) {
248  return AVERROR(ENOENT);
249  }
250  first_index = 0;
251  last_index = s->globstate.gl_pathc - 1;
252 #endif
253  }
254  }
255  if ((s->pattern_type == PT_GLOB_SEQUENCE && !s->use_glob) || s->pattern_type == PT_SEQUENCE) {
256  if (find_image_range(&first_index, &last_index, s->path,
257  s->start_number, s->start_number_range) < 0) {
258  av_log(s1, AV_LOG_ERROR,
259  "Could find no file with path '%s' and index in the range %d-%d\n",
260  s->path, s->start_number, s->start_number + s->start_number_range - 1);
261  return AVERROR(ENOENT);
262  }
263  } else if (s->pattern_type == PT_GLOB) {
264 #if HAVE_GLOB
265  int gerr;
266  gerr = glob(s->path, GLOB_NOCHECK|GLOB_BRACE|GLOB_NOMAGIC, NULL, &s->globstate);
267  if (gerr != 0) {
268  return AVERROR(ENOENT);
269  }
270  first_index = 0;
271  last_index = s->globstate.gl_pathc - 1;
272  s->use_glob = 1;
273 #else
274  av_log(s1, AV_LOG_ERROR,
275  "Pattern type 'glob' was selected but globbing "
276  "is not supported by this libavformat build\n");
277  return AVERROR(ENOSYS);
278 #endif
279  } else if (s->pattern_type != PT_GLOB_SEQUENCE) {
280  av_log(s1, AV_LOG_ERROR,
281  "Unknown value '%d' for pattern_type option\n", s->pattern_type);
282  return AVERROR(EINVAL);
283  }
284  s->img_first = first_index;
285  s->img_last = last_index;
286  s->img_number = first_index;
287  /* compute duration */
288  if (!s->ts_from_file) {
289  st->start_time = 0;
290  st->duration = last_index - first_index + 1;
291  }
292  }
293 
294  if (s1->video_codec_id) {
295  st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
296  st->codec->codec_id = s1->video_codec_id;
297  } else if (s1->audio_codec_id) {
298  st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
299  st->codec->codec_id = s1->audio_codec_id;
300  } else if (s1->iformat->raw_codec_id) {
301  st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
302  st->codec->codec_id = s1->iformat->raw_codec_id;
303  } else {
304  const char *str = strrchr(s->path, '.');
305  s->split_planes = str && !av_strcasecmp(str + 1, "y");
306  st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
307  if (s1->pb) {
308  int probe_buffer_size = 2048;
309  uint8_t *probe_buffer = av_realloc(NULL, probe_buffer_size + AVPROBE_PADDING_SIZE);
310  AVInputFormat *fmt = NULL;
311  AVProbeData pd;
312 
313  if (!probe_buffer)
314  return AVERROR(ENOMEM);
315 
316  probe_buffer_size = avio_read(s1->pb, probe_buffer, probe_buffer_size);
317  if (probe_buffer_size < 0) {
318  av_free(probe_buffer);
319  return probe_buffer_size;
320  }
321  memset(probe_buffer + probe_buffer_size, 0, AVPROBE_PADDING_SIZE);
322 
323  pd.buf = probe_buffer;
324  pd.buf_size = probe_buffer_size;
325  pd.filename = s1->filename;
326 
327  while ((fmt = av_iformat_next(fmt))) {
328  if (fmt->read_header != ff_img_read_header ||
329  !fmt->read_probe ||
330  (fmt->flags & AVFMT_NOFILE) ||
331  !fmt->raw_codec_id)
332  continue;
333  if (fmt->read_probe(&pd) > 0) {
334  st->codec->codec_id = fmt->raw_codec_id;
335  break;
336  }
337  }
338  ffio_rewind_with_probe_data(s1->pb, &probe_buffer, probe_buffer_size);
339  }
340  if (st->codec->codec_id == AV_CODEC_ID_NONE)
341  st->codec->codec_id = ff_guess_image2_codec(s->path);
342  if (st->codec->codec_id == AV_CODEC_ID_LJPEG)
343  st->codec->codec_id = AV_CODEC_ID_MJPEG;
344  if (st->codec->codec_id == AV_CODEC_ID_ALIAS_PIX) // we cannot distingiush this from BRENDER_PIX
345  st->codec->codec_id = AV_CODEC_ID_NONE;
346  }
347  if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
348  pix_fmt != AV_PIX_FMT_NONE)
349  st->codec->pix_fmt = pix_fmt;
350 
351  return 0;
352 }
353 
354 int ff_img_read_packet(AVFormatContext *s1, AVPacket *pkt)
355 {
356  VideoDemuxData *s = s1->priv_data;
357  char filename_bytes[1024];
358  char *filename = filename_bytes;
359  int i;
360  int size[3] = { 0 }, ret[3] = { 0 };
361  AVIOContext *f[3] = { NULL };
362  AVCodecContext *codec = s1->streams[0]->codec;
363 
364  if (!s->is_pipe) {
365  /* loop over input */
366  if (s->loop && s->img_number > s->img_last) {
367  s->img_number = s->img_first;
368  }
369  if (s->img_number > s->img_last)
370  return AVERROR_EOF;
371  if (s->use_glob) {
372 #if HAVE_GLOB
373  filename = s->globstate.gl_pathv[s->img_number];
374 #endif
375  } else {
376  if (av_get_frame_filename(filename_bytes, sizeof(filename_bytes),
377  s->path,
378  s->img_number) < 0 && s->img_number > 1)
379  return AVERROR(EIO);
380  }
381  for (i = 0; i < 3; i++) {
382  if (avio_open2(&f[i], filename, AVIO_FLAG_READ,
383  &s1->interrupt_callback, NULL) < 0) {
384  if (i >= 1)
385  break;
386  av_log(s1, AV_LOG_ERROR, "Could not open file : %s\n",
387  filename);
388  return AVERROR(EIO);
389  }
390  size[i] = avio_size(f[i]);
391 
392  if (!s->split_planes)
393  break;
394  filename[strlen(filename) - 1] = 'U' + i;
395  }
396 
397  if (codec->codec_id == AV_CODEC_ID_NONE) {
398  AVProbeData pd;
399  AVInputFormat *ifmt;
400  uint8_t header[PROBE_BUF_MIN + AVPROBE_PADDING_SIZE];
401  int ret;
402  int score = 0;
403 
404  ret = avio_read(f[0], header, PROBE_BUF_MIN);
405  if (ret < 0)
406  return ret;
407  memset(header + ret, 0, sizeof(header) - ret);
408  avio_skip(f[0], -ret);
409  pd.buf = header;
410  pd.buf_size = ret;
411  pd.filename = filename;
412 
413  ifmt = av_probe_input_format3(&pd, 1, &score);
414  if (ifmt && ifmt->read_packet == ff_img_read_packet && ifmt->raw_codec_id)
415  codec->codec_id = ifmt->raw_codec_id;
416  }
417 
418  if (codec->codec_id == AV_CODEC_ID_RAWVIDEO && !codec->width)
419  infer_size(&codec->width, &codec->height, size[0]);
420  } else {
421  f[0] = s1->pb;
422  if (url_feof(f[0]))
423  return AVERROR(EIO);
424  if (s->frame_size > 0) {
425  size[0] = s->frame_size;
426  } else if (!s1->streams[0]->parser) {
427  size[0] = avio_size(s1->pb);
428  } else {
429  size[0] = 4096;
430  }
431  }
432 
433  if (av_new_packet(pkt, size[0] + size[1] + size[2]) < 0)
434  return AVERROR(ENOMEM);
435  pkt->stream_index = 0;
436  pkt->flags |= AV_PKT_FLAG_KEY;
437  if (s->ts_from_file) {
438  struct stat img_stat;
439  if (stat(filename, &img_stat))
440  return AVERROR(EIO);
441  pkt->pts = (int64_t)img_stat.st_mtime;
442 #if HAVE_STRUCT_STAT_ST_MTIM_TV_NSEC
443  if (s->ts_from_file == 2)
444  pkt->pts = 1000000000*pkt->pts + img_stat.st_mtim.tv_nsec;
445 #endif
446  av_add_index_entry(s1->streams[0], s->img_number, pkt->pts, 0, 0, AVINDEX_KEYFRAME);
447  } else if (!s->is_pipe) {
448  pkt->pts = s->pts;
449  }
450 
451  pkt->size = 0;
452  for (i = 0; i < 3; i++) {
453  if (f[i]) {
454  ret[i] = avio_read(f[i], pkt->data + pkt->size, size[i]);
455  if (!s->is_pipe)
456  avio_close(f[i]);
457  if (ret[i] > 0)
458  pkt->size += ret[i];
459  }
460  }
461 
462  if (ret[0] <= 0 || ret[1] < 0 || ret[2] < 0) {
463  av_free_packet(pkt);
464  return AVERROR(EIO); /* signal EOF */
465  } else {
466  s->img_count++;
467  s->img_number++;
468  s->pts++;
469  return 0;
470  }
471 }
472 
473 static int img_read_close(struct AVFormatContext* s1)
474 {
475  VideoDemuxData *s = s1->priv_data;
476 #if HAVE_GLOB
477  if (s->use_glob) {
478  globfree(&s->globstate);
479  }
480 #endif
481  return 0;
482 }
483 
484 static int img_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
485 {
486  VideoDemuxData *s1 = s->priv_data;
487  AVStream *st = s->streams[0];
488 
489  if (s1->ts_from_file) {
490  int index = av_index_search_timestamp(st, timestamp, flags);
491  if(index < 0)
492  return -1;
493  s1->img_number = st->index_entries[index].pos;
494  return 0;
495  }
496 
497  if (timestamp < 0 || !s1->loop && timestamp > s1->img_last - s1->img_first)
498  return -1;
499  s1->img_number = timestamp%(s1->img_last - s1->img_first + 1) + s1->img_first;
500  s1->pts = timestamp;
501  return 0;
502 }
503 
504 #define OFFSET(x) offsetof(VideoDemuxData, x)
505 #define DEC AV_OPT_FLAG_DECODING_PARAM
506 static const AVOption options[] = {
507  { "framerate", "set the video framerate", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, 0, DEC },
508  { "loop", "force loop over input file sequence", OFFSET(loop), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 1, DEC },
509 
510  { "pattern_type", "set pattern type", OFFSET(pattern_type), AV_OPT_TYPE_INT, {.i64=PT_GLOB_SEQUENCE}, 0, INT_MAX, DEC, "pattern_type"},
511  { "glob_sequence","select glob/sequence pattern type", 0, AV_OPT_TYPE_CONST, {.i64=PT_GLOB_SEQUENCE}, INT_MIN, INT_MAX, DEC, "pattern_type" },
512  { "glob", "select glob pattern type", 0, AV_OPT_TYPE_CONST, {.i64=PT_GLOB }, INT_MIN, INT_MAX, DEC, "pattern_type" },
513  { "sequence", "select sequence pattern type", 0, AV_OPT_TYPE_CONST, {.i64=PT_SEQUENCE }, INT_MIN, INT_MAX, DEC, "pattern_type" },
514 
515  { "pixel_format", "set video pixel format", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
516  { "start_number", "set first number in the sequence", OFFSET(start_number), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, DEC },
517  { "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 },
518  { "video_size", "set video size", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, DEC },
519  { "frame_size", "force frame size in bytes", OFFSET(frame_size), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, DEC },
520  { "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" },
521  { "none", "none", 0, AV_OPT_TYPE_CONST, {.i64 = 0 }, 0, 2, DEC, "ts_type" },
522  { "sec", "second precision", 0, AV_OPT_TYPE_CONST, {.i64 = 1 }, 0, 2, DEC, "ts_type" },
523  { "ns", "nano second precision", 0, AV_OPT_TYPE_CONST, {.i64 = 2 }, 0, 2, DEC, "ts_type" },
524  { NULL },
525 };
526 
527 #if CONFIG_IMAGE2_DEMUXER
528 static const AVClass img2_class = {
529  .class_name = "image2 demuxer",
530  .item_name = av_default_item_name,
531  .option = options,
532  .version = LIBAVUTIL_VERSION_INT,
533 };
534 AVInputFormat ff_image2_demuxer = {
535  .name = "image2",
536  .long_name = NULL_IF_CONFIG_SMALL("image2 sequence"),
537  .priv_data_size = sizeof(VideoDemuxData),
538  .read_probe = img_read_probe,
539  .read_header = ff_img_read_header,
540  .read_packet = ff_img_read_packet,
541  .read_close = img_read_close,
542  .read_seek = img_read_seek,
543  .flags = AVFMT_NOFILE,
544  .priv_class = &img2_class,
545 };
546 #endif
547 #if CONFIG_IMAGE2PIPE_DEMUXER
548 static const AVClass img2pipe_class = {
549  .class_name = "image2pipe demuxer",
550  .item_name = av_default_item_name,
551  .option = options,
552  .version = LIBAVUTIL_VERSION_INT,
553 };
554 AVInputFormat ff_image2pipe_demuxer = {
555  .name = "image2pipe",
556  .long_name = NULL_IF_CONFIG_SMALL("piped image2 sequence"),
557  .priv_data_size = sizeof(VideoDemuxData),
558  .read_header = ff_img_read_header,
559  .read_packet = ff_img_read_packet,
560  .priv_class = &img2pipe_class,
561 };
562 #endif
563 
564 static int bmp_probe(AVProbeData *p)
565 {
566  const uint8_t *b = p->buf;
567  int ihsize;
568 
569  if (AV_RB16(b) != 0x424d)
570  return 0;
571 
572  ihsize = AV_RL32(b+14);
573  if (ihsize < 12 || ihsize > 255)
574  return 0;
575 
576  if (!AV_RN32(b + 6)) {
577  return AVPROBE_SCORE_EXTENSION + 1;
578  } else {
579  return AVPROBE_SCORE_EXTENSION / 4;
580  }
581  return 0;
582 }
583 
584 static int dpx_probe(AVProbeData *p)
585 {
586  const uint8_t *b = p->buf;
587 
588  if (AV_RN32(b) == AV_RN32("SDPX") || AV_RN32(b) == AV_RN32("XPDS"))
589  return AVPROBE_SCORE_EXTENSION + 1;
590  return 0;
591 }
592 
593 static int exr_probe(AVProbeData *p)
594 {
595  const uint8_t *b = p->buf;
596 
597  if (AV_RL32(b) == 20000630)
598  return AVPROBE_SCORE_EXTENSION + 1;
599  return 0;
600 }
601 
602 static int j2k_probe(AVProbeData *p)
603 {
604  const uint8_t *b = p->buf;
605 
606  if (AV_RB64(b) == 0x0000000c6a502020 ||
607  AV_RB32(b) == 0xff4fff51)
608  return AVPROBE_SCORE_EXTENSION + 1;
609  return 0;
610 }
611 
612 static int pictor_probe(AVProbeData *p)
613 {
614  const uint8_t *b = p->buf;
615 
616  if (AV_RL16(b) == 0x1234)
617  return AVPROBE_SCORE_EXTENSION / 4;
618  return 0;
619 }
620 
621 static int png_probe(AVProbeData *p)
622 {
623  const uint8_t *b = p->buf;
624 
625  if (AV_RB64(b) == 0x89504e470d0a1a0a)
626  return AVPROBE_SCORE_MAX - 1;
627  return 0;
628 }
629 
630 static int sgi_probe(AVProbeData *p)
631 {
632  const uint8_t *b = p->buf;
633 
634  if (AV_RB16(b) == 474 &&
635  (b[2] & ~1) == 0 &&
636  (b[3] & ~3) == 0 && b[3] &&
637  (AV_RB16(b + 4) & ~7) == 0 && AV_RB16(b + 4))
638  return AVPROBE_SCORE_EXTENSION + 1;
639  return 0;
640 }
641 
642 static int sunrast_probe(AVProbeData *p)
643 {
644  const uint8_t *b = p->buf;
645 
646  if (AV_RB32(b) == 0x59a66a95)
647  return AVPROBE_SCORE_EXTENSION + 1;
648  return 0;
649 }
650 
651 static int tiff_probe(AVProbeData *p)
652 {
653  const uint8_t *b = p->buf;
654 
655  if (AV_RB32(b) == 0x49492a00)
656  return AVPROBE_SCORE_EXTENSION + 1;
657  return 0;
658 }
659 
660 #define IMAGEAUTO_DEMUXER(imgname, codecid)\
661 static const AVClass imgname ## _class = {\
662  .class_name = AV_STRINGIFY(imgname) " demuxer",\
663  .item_name = av_default_item_name,\
664  .option = options,\
665  .version = LIBAVUTIL_VERSION_INT,\
666 };\
667 AVInputFormat ff_image_ ## imgname ## _pipe_demuxer = {\
668  .name = AV_STRINGIFY(imgname) "_pipe",\
669  .priv_data_size = sizeof(VideoDemuxData),\
670  .read_probe = imgname ## _probe,\
671  .read_header = ff_img_read_header,\
672  .read_packet = ff_img_read_packet,\
673  .priv_class = & imgname ## _class,\
674  .raw_codec_id = codecid,\
675 };
676 
677 IMAGEAUTO_DEMUXER(bmp, AV_CODEC_ID_BMP)
678 IMAGEAUTO_DEMUXER(dpx, AV_CODEC_ID_DPX)
679 IMAGEAUTO_DEMUXER(exr, AV_CODEC_ID_EXR)
680 IMAGEAUTO_DEMUXER(j2k, AV_CODEC_ID_JPEG2000)
681 IMAGEAUTO_DEMUXER(pictor, AV_CODEC_ID_PICTOR)
682 IMAGEAUTO_DEMUXER(png, AV_CODEC_ID_PNG)
683 IMAGEAUTO_DEMUXER(sgi, AV_CODEC_ID_SGI)
684 IMAGEAUTO_DEMUXER(sunrast, AV_CODEC_ID_SUNRAST)
685 IMAGEAUTO_DEMUXER(tiff, AV_CODEC_ID_TIFF)
Generated on Sun Jul 20 2014 23:06:03 for FFmpeg by   doxygen 1.8.2