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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  char *p = s->path, *q, *dup;
231  int gerr;
232 
233  av_log(s1, AV_LOG_WARNING, "Pattern type 'glob_sequence' is deprecated: "
234  "use pattern_type 'glob' instead\n");
235 #if HAVE_GLOB
236  dup = q = av_strdup(p);
237  while (*q) {
238  /* Do we have room for the next char and a \ insertion? */
239  if ((p - s->path) >= (sizeof(s->path) - 2))
240  break;
241  if (*q == '%' && strspn(q + 1, "%*?[]{}"))
242  ++q;
243  else if (strspn(q, "\\*?[]{}"))
244  *p++ = '\\';
245  *p++ = *q++;
246  }
247  *p = 0;
248  av_free(dup);
249 
250  gerr = glob(s->path, GLOB_NOCHECK|GLOB_BRACE|GLOB_NOMAGIC, NULL, &s->globstate);
251  if (gerr != 0) {
252  return AVERROR(ENOENT);
253  }
254  first_index = 0;
255  last_index = s->globstate.gl_pathc - 1;
256 #endif
257  }
258  }
259  if ((s->pattern_type == PT_GLOB_SEQUENCE && !s->use_glob) || s->pattern_type == PT_SEQUENCE) {
260  if (find_image_range(&first_index, &last_index, s->path,
261  s->start_number, s->start_number_range) < 0) {
262  av_log(s1, AV_LOG_ERROR,
263  "Could find no file with path '%s' and index in the range %d-%d\n",
264  s->path, s->start_number, s->start_number + s->start_number_range - 1);
265  return AVERROR(ENOENT);
266  }
267  } else if (s->pattern_type == PT_GLOB) {
268 #if HAVE_GLOB
269  int gerr;
270  gerr = glob(s->path, GLOB_NOCHECK|GLOB_BRACE|GLOB_NOMAGIC, NULL, &s->globstate);
271  if (gerr != 0) {
272  return AVERROR(ENOENT);
273  }
274  first_index = 0;
275  last_index = s->globstate.gl_pathc - 1;
276  s->use_glob = 1;
277 #else
278  av_log(s1, AV_LOG_ERROR,
279  "Pattern type 'glob' was selected but globbing "
280  "is not supported by this libavformat build\n");
281  return AVERROR(ENOSYS);
282 #endif
283  } else if (s->pattern_type != PT_GLOB_SEQUENCE) {
284  av_log(s1, AV_LOG_ERROR,
285  "Unknown value '%d' for pattern_type option\n", s->pattern_type);
286  return AVERROR(EINVAL);
287  }
288  s->img_first = first_index;
289  s->img_last = last_index;
290  s->img_number = first_index;
291  /* compute duration */
292  if (!s->ts_from_file) {
293  st->start_time = 0;
294  st->duration = last_index - first_index + 1;
295  }
296  }
297 
298  if (s1->video_codec_id) {
299  st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
300  st->codec->codec_id = s1->video_codec_id;
301  } else if (s1->audio_codec_id) {
302  st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
303  st->codec->codec_id = s1->audio_codec_id;
304  } else if (s1->iformat->raw_codec_id) {
305  st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
306  st->codec->codec_id = s1->iformat->raw_codec_id;
307  } else {
308  const char *str = strrchr(s->path, '.');
309  s->split_planes = str && !av_strcasecmp(str + 1, "y");
310  st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
311  if (s1->pb) {
312  int probe_buffer_size = 2048;
313  uint8_t *probe_buffer = av_realloc(NULL, probe_buffer_size + AVPROBE_PADDING_SIZE);
314  AVInputFormat *fmt = NULL;
315  AVProbeData pd = { 0 };
316 
317  if (!probe_buffer)
318  return AVERROR(ENOMEM);
319 
320  probe_buffer_size = avio_read(s1->pb, probe_buffer, probe_buffer_size);
321  if (probe_buffer_size < 0) {
322  av_free(probe_buffer);
323  return probe_buffer_size;
324  }
325  memset(probe_buffer + probe_buffer_size, 0, AVPROBE_PADDING_SIZE);
326 
327  pd.buf = probe_buffer;
328  pd.buf_size = probe_buffer_size;
329  pd.filename = s1->filename;
330 
331  while ((fmt = av_iformat_next(fmt))) {
332  if (fmt->read_header != ff_img_read_header ||
333  !fmt->read_probe ||
334  (fmt->flags & AVFMT_NOFILE) ||
335  !fmt->raw_codec_id)
336  continue;
337  if (fmt->read_probe(&pd) > 0) {
338  st->codec->codec_id = fmt->raw_codec_id;
339  break;
340  }
341  }
342  ffio_rewind_with_probe_data(s1->pb, &probe_buffer, probe_buffer_size);
343  }
344  if (st->codec->codec_id == AV_CODEC_ID_NONE)
345  st->codec->codec_id = ff_guess_image2_codec(s->path);
346  if (st->codec->codec_id == AV_CODEC_ID_LJPEG)
347  st->codec->codec_id = AV_CODEC_ID_MJPEG;
348  if (st->codec->codec_id == AV_CODEC_ID_ALIAS_PIX) // we cannot distingiush this from BRENDER_PIX
349  st->codec->codec_id = AV_CODEC_ID_NONE;
350  }
351  if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
352  pix_fmt != AV_PIX_FMT_NONE)
353  st->codec->pix_fmt = pix_fmt;
354 
355  return 0;
356 }
357 
358 int ff_img_read_packet(AVFormatContext *s1, AVPacket *pkt)
359 {
360  VideoDemuxData *s = s1->priv_data;
361  char filename_bytes[1024];
362  char *filename = filename_bytes;
363  int i, res;
364  int size[3] = { 0 }, ret[3] = { 0 };
365  AVIOContext *f[3] = { NULL };
366  AVCodecContext *codec = s1->streams[0]->codec;
367 
368  if (!s->is_pipe) {
369  /* loop over input */
370  if (s->loop && s->img_number > s->img_last) {
371  s->img_number = s->img_first;
372  }
373  if (s->img_number > s->img_last)
374  return AVERROR_EOF;
375  if (s->use_glob) {
376 #if HAVE_GLOB
377  filename = s->globstate.gl_pathv[s->img_number];
378 #endif
379  } else {
380  if (av_get_frame_filename(filename_bytes, sizeof(filename_bytes),
381  s->path,
382  s->img_number) < 0 && s->img_number > 1)
383  return AVERROR(EIO);
384  }
385  for (i = 0; i < 3; i++) {
386  if (avio_open2(&f[i], filename, AVIO_FLAG_READ,
387  &s1->interrupt_callback, NULL) < 0) {
388  if (i >= 1)
389  break;
390  av_log(s1, AV_LOG_ERROR, "Could not open file : %s\n",
391  filename);
392  return AVERROR(EIO);
393  }
394  size[i] = avio_size(f[i]);
395 
396  if (!s->split_planes)
397  break;
398  filename[strlen(filename) - 1] = 'U' + i;
399  }
400 
401  if (codec->codec_id == AV_CODEC_ID_NONE) {
402  AVProbeData pd = { 0 };
403  AVInputFormat *ifmt;
404  uint8_t header[PROBE_BUF_MIN + AVPROBE_PADDING_SIZE];
405  int ret;
406  int score = 0;
407 
408  ret = avio_read(f[0], header, PROBE_BUF_MIN);
409  if (ret < 0)
410  return ret;
411  memset(header + ret, 0, sizeof(header) - ret);
412  avio_skip(f[0], -ret);
413  pd.buf = header;
414  pd.buf_size = ret;
415  pd.filename = filename;
416 
417  ifmt = av_probe_input_format3(&pd, 1, &score);
418  if (ifmt && ifmt->read_packet == ff_img_read_packet && ifmt->raw_codec_id)
419  codec->codec_id = ifmt->raw_codec_id;
420  }
421 
422  if (codec->codec_id == AV_CODEC_ID_RAWVIDEO && !codec->width)
423  infer_size(&codec->width, &codec->height, size[0]);
424  } else {
425  f[0] = s1->pb;
426  if (avio_feof(f[0]) && s->loop && s->is_pipe)
427  avio_seek(f[0], 0, SEEK_SET);
428  if (avio_feof(f[0]))
429  return AVERROR_EOF;
430  if (s->frame_size > 0) {
431  size[0] = s->frame_size;
432  } else if (!s1->streams[0]->parser) {
433  size[0] = avio_size(s1->pb);
434  } else {
435  size[0] = 4096;
436  }
437  }
438 
439  res = av_new_packet(pkt, size[0] + size[1] + size[2]);
440  if (res < 0)
441  return res;
442  pkt->stream_index = 0;
443  pkt->flags |= AV_PKT_FLAG_KEY;
444  if (s->ts_from_file) {
445  struct stat img_stat;
446  if (stat(filename, &img_stat))
447  return AVERROR(EIO);
448  pkt->pts = (int64_t)img_stat.st_mtime;
449 #if HAVE_STRUCT_STAT_ST_MTIM_TV_NSEC
450  if (s->ts_from_file == 2)
451  pkt->pts = 1000000000*pkt->pts + img_stat.st_mtim.tv_nsec;
452 #endif
453  av_add_index_entry(s1->streams[0], s->img_number, pkt->pts, 0, 0, AVINDEX_KEYFRAME);
454  } else if (!s->is_pipe) {
455  pkt->pts = s->pts;
456  }
457 
458  if (s->is_pipe)
459  pkt->pos = avio_tell(f[0]);
460 
461  pkt->size = 0;
462  for (i = 0; i < 3; i++) {
463  if (f[i]) {
464  ret[i] = avio_read(f[i], pkt->data + pkt->size, size[i]);
465  if (s->loop && s->is_pipe && ret[i] == AVERROR_EOF) {
466  if (avio_seek(f[i], 0, SEEK_SET) >= 0) {
467  pkt->pos = 0;
468  ret[i] = avio_read(f[i], pkt->data + pkt->size, size[i]);
469  }
470  }
471  if (!s->is_pipe)
472  avio_close(f[i]);
473  if (ret[i] > 0)
474  pkt->size += ret[i];
475  }
476  }
477 
478  if (ret[0] <= 0 || ret[1] < 0 || ret[2] < 0) {
479  av_free_packet(pkt);
480  if (ret[0] < 0) {
481  return ret[0];
482  } else if (ret[1] < 0) {
483  return ret[1];
484  } else if (ret[2] < 0)
485  return ret[2];
486  return AVERROR_EOF;
487  } else {
488  s->img_count++;
489  s->img_number++;
490  s->pts++;
491  return 0;
492  }
493 }
494 
495 static int img_read_close(struct AVFormatContext* s1)
496 {
497  VideoDemuxData *s = s1->priv_data;
498 #if HAVE_GLOB
499  if (s->use_glob) {
500  globfree(&s->globstate);
501  }
502 #endif
503  return 0;
504 }
505 
506 static int img_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
507 {
508  VideoDemuxData *s1 = s->priv_data;
509  AVStream *st = s->streams[0];
510 
511  if (s1->ts_from_file) {
512  int index = av_index_search_timestamp(st, timestamp, flags);
513  if(index < 0)
514  return -1;
515  s1->img_number = st->index_entries[index].pos;
516  return 0;
517  }
518 
519  if (timestamp < 0 || !s1->loop && timestamp > s1->img_last - s1->img_first)
520  return -1;
521  s1->img_number = timestamp%(s1->img_last - s1->img_first + 1) + s1->img_first;
522  s1->pts = timestamp;
523  return 0;
524 }
525 
526 #define OFFSET(x) offsetof(VideoDemuxData, x)
527 #define DEC AV_OPT_FLAG_DECODING_PARAM
528 const AVOption ff_img_options[] = {
529  { "framerate", "set the video framerate", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, 0, DEC },
530  { "loop", "force loop over input file sequence", OFFSET(loop), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 1, DEC },
531 
532  { "pattern_type", "set pattern type", OFFSET(pattern_type), AV_OPT_TYPE_INT, {.i64=PT_GLOB_SEQUENCE}, 0, INT_MAX, DEC, "pattern_type"},
533  { "glob_sequence","select glob/sequence pattern type", 0, AV_OPT_TYPE_CONST, {.i64=PT_GLOB_SEQUENCE}, INT_MIN, INT_MAX, DEC, "pattern_type" },
534  { "glob", "select glob pattern type", 0, AV_OPT_TYPE_CONST, {.i64=PT_GLOB }, INT_MIN, INT_MAX, DEC, "pattern_type" },
535  { "sequence", "select sequence pattern type", 0, AV_OPT_TYPE_CONST, {.i64=PT_SEQUENCE }, INT_MIN, INT_MAX, DEC, "pattern_type" },
536 
537  { "pixel_format", "set video pixel format", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
538  { "start_number", "set first number in the sequence", OFFSET(start_number), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, DEC },
539  { "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 },
540  { "video_size", "set video size", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, DEC },
541  { "frame_size", "force frame size in bytes", OFFSET(frame_size), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, DEC },
542  { "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" },
543  { "none", "none", 0, AV_OPT_TYPE_CONST, {.i64 = 0 }, 0, 2, DEC, "ts_type" },
544  { "sec", "second precision", 0, AV_OPT_TYPE_CONST, {.i64 = 1 }, 0, 2, DEC, "ts_type" },
545  { "ns", "nano second precision", 0, AV_OPT_TYPE_CONST, {.i64 = 2 }, 0, 2, DEC, "ts_type" },
546  { NULL },
547 };
548 
549 #if CONFIG_IMAGE2_DEMUXER
550 static const AVClass img2_class = {
551  .class_name = "image2 demuxer",
552  .item_name = av_default_item_name,
553  .option = ff_img_options,
554  .version = LIBAVUTIL_VERSION_INT,
555 };
556 AVInputFormat ff_image2_demuxer = {
557  .name = "image2",
558  .long_name = NULL_IF_CONFIG_SMALL("image2 sequence"),
559  .priv_data_size = sizeof(VideoDemuxData),
560  .read_probe = img_read_probe,
561  .read_header = ff_img_read_header,
562  .read_packet = ff_img_read_packet,
563  .read_close = img_read_close,
564  .read_seek = img_read_seek,
565  .flags = AVFMT_NOFILE,
566  .priv_class = &img2_class,
567 };
568 #endif
569 #if CONFIG_IMAGE2PIPE_DEMUXER
570 static const AVClass img2pipe_class = {
571  .class_name = "image2pipe demuxer",
572  .item_name = av_default_item_name,
573  .option = ff_img_options,
574  .version = LIBAVUTIL_VERSION_INT,
575 };
576 AVInputFormat ff_image2pipe_demuxer = {
577  .name = "image2pipe",
578  .long_name = NULL_IF_CONFIG_SMALL("piped image2 sequence"),
579  .priv_data_size = sizeof(VideoDemuxData),
580  .read_header = ff_img_read_header,
581  .read_packet = ff_img_read_packet,
582  .priv_class = &img2pipe_class,
583 };
584 #endif
585 
586 static int bmp_probe(AVProbeData *p)
587 {
588  const uint8_t *b = p->buf;
589  int ihsize;
590 
591  if (AV_RB16(b) != 0x424d)
592  return 0;
593 
594  ihsize = AV_RL32(b+14);
595  if (ihsize < 12 || ihsize > 255)
596  return 0;
597 
598  if (!AV_RN32(b + 6)) {
599  return AVPROBE_SCORE_EXTENSION + 1;
600  } else {
601  return AVPROBE_SCORE_EXTENSION / 4;
602  }
603  return 0;
604 }
605 
606 static int dpx_probe(AVProbeData *p)
607 {
608  const uint8_t *b = p->buf;
609 
610  if (AV_RN32(b) == AV_RN32("SDPX") || AV_RN32(b) == AV_RN32("XPDS"))
611  return AVPROBE_SCORE_EXTENSION + 1;
612  return 0;
613 }
614 
615 static int exr_probe(AVProbeData *p)
616 {
617  const uint8_t *b = p->buf;
618 
619  if (AV_RL32(b) == 20000630)
620  return AVPROBE_SCORE_EXTENSION + 1;
621  return 0;
622 }
623 
624 static int j2k_probe(AVProbeData *p)
625 {
626  const uint8_t *b = p->buf;
627 
628  if (AV_RB64(b) == 0x0000000c6a502020 ||
629  AV_RB32(b) == 0xff4fff51)
630  return AVPROBE_SCORE_EXTENSION + 1;
631  return 0;
632 }
633 
634 static int jpeg_probe(AVProbeData *p)
635 {
636  const uint8_t *b = p->buf;
637  int i, state = 0xD8;
638 
639  if (AV_RB16(b) != 0xFFD8 ||
640  AV_RB32(b) == 0xFFD8FFF7)
641  return 0;
642 
643  b += 2;
644  for (i = 0; i < p->buf_size - 2; i++) {
645  int c;
646  if (b[i] != 0xFF)
647  continue;
648  c = b[i + 1];
649  switch (c) {
650  case 0xD8:
651  return 0;
652  case 0xC0:
653  case 0xC1:
654  case 0xC2:
655  case 0xC3:
656  case 0xC5:
657  case 0xC6:
658  case 0xC7:
659  if (state != 0xD8)
660  return 0;
661  state = 0xC0;
662  break;
663  case 0xDA:
664  if (state != 0xC0)
665  return 0;
666  state = 0xDA;
667  break;
668  case 0xD9:
669  if (state != 0xDA)
670  return 0;
671  state = 0xD9;
672  break;
673  default:
674  if ( (c >= 0x02 && c <= 0xBF)
675  || c == 0xC8)
676  return 0;
677  }
678  }
679 
680  if (state == 0xD9)
681  return AVPROBE_SCORE_EXTENSION + 1;
682  return AVPROBE_SCORE_EXTENSION / 8;
683 }
684 
685 static int jpegls_probe(AVProbeData *p)
686 {
687  const uint8_t *b = p->buf;
688 
689  if (AV_RB32(b) == 0xffd8fff7)
690  return AVPROBE_SCORE_EXTENSION + 1;
691  return 0;
692 }
693 
694 static int pictor_probe(AVProbeData *p)
695 {
696  const uint8_t *b = p->buf;
697 
698  if (AV_RL16(b) == 0x1234)
699  return AVPROBE_SCORE_EXTENSION / 4;
700  return 0;
701 }
702 
703 static int png_probe(AVProbeData *p)
704 {
705  const uint8_t *b = p->buf;
706 
707  if (AV_RB64(b) == 0x89504e470d0a1a0a)
708  return AVPROBE_SCORE_MAX - 1;
709  return 0;
710 }
711 
712 static int sgi_probe(AVProbeData *p)
713 {
714  const uint8_t *b = p->buf;
715 
716  if (AV_RB16(b) == 474 &&
717  (b[2] & ~1) == 0 &&
718  (b[3] & ~3) == 0 && b[3] &&
719  (AV_RB16(b + 4) & ~7) == 0 && AV_RB16(b + 4))
720  return AVPROBE_SCORE_EXTENSION + 1;
721  return 0;
722 }
723 
724 static int sunrast_probe(AVProbeData *p)
725 {
726  const uint8_t *b = p->buf;
727 
728  if (AV_RB32(b) == 0x59a66a95)
729  return AVPROBE_SCORE_EXTENSION + 1;
730  return 0;
731 }
732 
733 static int tiff_probe(AVProbeData *p)
734 {
735  const uint8_t *b = p->buf;
736 
737  if (AV_RB32(b) == 0x49492a00 ||
738  AV_RB32(b) == 0x4D4D002a)
739  return AVPROBE_SCORE_EXTENSION + 1;
740  return 0;
741 }
742 
743 static int webp_probe(AVProbeData *p)
744 {
745  const uint8_t *b = p->buf;
746 
747  if (AV_RB32(b) == 0x52494646 &&
748  AV_RB32(b + 8) == 0x57454250)
749  return AVPROBE_SCORE_MAX - 1;
750  return 0;
751 }
752 
753 #define IMAGEAUTO_DEMUXER(imgname, codecid)\
754 static const AVClass imgname ## _class = {\
755  .class_name = AV_STRINGIFY(imgname) " demuxer",\
756  .item_name = av_default_item_name,\
757  .option = ff_img_options,\
758  .version = LIBAVUTIL_VERSION_INT,\
759 };\
760 AVInputFormat ff_image_ ## imgname ## _pipe_demuxer = {\
761  .name = AV_STRINGIFY(imgname) "_pipe",\
762  .long_name = NULL_IF_CONFIG_SMALL("piped " AV_STRINGIFY(imgname) " sequence"),\
763  .priv_data_size = sizeof(VideoDemuxData),\
764  .read_probe = imgname ## _probe,\
765  .read_header = ff_img_read_header,\
766  .read_packet = ff_img_read_packet,\
767  .priv_class = & imgname ## _class,\
768  .flags = AVFMT_GENERIC_INDEX, \
769  .raw_codec_id = codecid,\
770 };
771 
772 IMAGEAUTO_DEMUXER(bmp, AV_CODEC_ID_BMP)
773 IMAGEAUTO_DEMUXER(dpx, AV_CODEC_ID_DPX)
774 IMAGEAUTO_DEMUXER(exr, AV_CODEC_ID_EXR)
775 IMAGEAUTO_DEMUXER(j2k, AV_CODEC_ID_JPEG2000)
776 IMAGEAUTO_DEMUXER(jpeg, AV_CODEC_ID_MJPEG)
777 IMAGEAUTO_DEMUXER(jpegls, AV_CODEC_ID_JPEGLS)
778 IMAGEAUTO_DEMUXER(pictor, AV_CODEC_ID_PICTOR)
779 IMAGEAUTO_DEMUXER(png, AV_CODEC_ID_PNG)
780 IMAGEAUTO_DEMUXER(sgi, AV_CODEC_ID_SGI)
781 IMAGEAUTO_DEMUXER(sunrast, AV_CODEC_ID_SUNRAST)
782 IMAGEAUTO_DEMUXER(tiff, AV_CODEC_ID_TIFF)
783 IMAGEAUTO_DEMUXER(webp, AV_CODEC_ID_WEBP)
Generated on Fri Dec 5 2014 04:42:11 for FFmpeg by   doxygen 1.8.2