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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->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
171  }
172  return 0;
173 }
174 
176 {
177  VideoDemuxData *s = s1->priv_data;
178  int first_index, last_index;
179  AVStream *st;
181 
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;
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
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) {
298  st->codec->codec_id = s1->video_codec_id;
299  } else if (s1->audio_codec_id) {
301  st->codec->codec_id = s1->audio_codec_id;
302  } else if (s1->iformat->raw_codec_id) {
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");
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)
344  if (st->codec->codec_id == AV_CODEC_ID_LJPEG)
346  if (st->codec->codec_id == AV_CODEC_ID_ALIAS_PIX) // we cannot distingiush this from BRENDER_PIX
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 
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;
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_EOF;
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  if (s->is_pipe)
454  pkt->pos = avio_tell(f[0]);
455 
456  pkt->size = 0;
457  for (i = 0; i < 3; i++) {
458  if (f[i]) {
459  ret[i] = avio_read(f[i], pkt->data + pkt->size, size[i]);
460  if (!s->is_pipe)
461  avio_close(f[i]);
462  if (ret[i] > 0)
463  pkt->size += ret[i];
464  }
465  }
466 
467  if (ret[0] <= 0 || ret[1] < 0 || ret[2] < 0) {
468  av_free_packet(pkt);
469  if (ret[0] < 0) {
470  return ret[0];
471  } else if (ret[1] < 0) {
472  return ret[1];
473  } else if (ret[2] < 0)
474  return ret[2];
475  return AVERROR_EOF;
476  } else {
477  s->img_count++;
478  s->img_number++;
479  s->pts++;
480  return 0;
481  }
482 }
483 
484 static int img_read_close(struct AVFormatContext* s1)
485 {
486  VideoDemuxData *s = s1->priv_data;
487 #if HAVE_GLOB
488  if (s->use_glob) {
489  globfree(&s->globstate);
490  }
491 #endif
492  return 0;
493 }
494 
495 static int img_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
496 {
498  AVStream *st = s->streams[0];
499 
500  if (s1->ts_from_file) {
501  int index = av_index_search_timestamp(st, timestamp, flags);
502  if(index < 0)
503  return -1;
504  s1->img_number = st->index_entries[index].pos;
505  return 0;
506  }
507 
508  if (timestamp < 0 || !s1->loop && timestamp > s1->img_last - s1->img_first)
509  return -1;
510  s1->img_number = timestamp%(s1->img_last - s1->img_first + 1) + s1->img_first;
511  s1->pts = timestamp;
512  return 0;
513 }
514 
515 #define OFFSET(x) offsetof(VideoDemuxData, x)
516 #define DEC AV_OPT_FLAG_DECODING_PARAM
518  { "framerate", "set the video framerate", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, 0, DEC },
519  { "loop", "force loop over input file sequence", OFFSET(loop), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 1, DEC },
520 
521  { "pattern_type", "set pattern type", OFFSET(pattern_type), AV_OPT_TYPE_INT, {.i64=PT_GLOB_SEQUENCE}, 0, INT_MAX, DEC, "pattern_type"},
522  { "glob_sequence","select glob/sequence pattern type", 0, AV_OPT_TYPE_CONST, {.i64=PT_GLOB_SEQUENCE}, INT_MIN, INT_MAX, DEC, "pattern_type" },
523  { "glob", "select glob pattern type", 0, AV_OPT_TYPE_CONST, {.i64=PT_GLOB }, INT_MIN, INT_MAX, DEC, "pattern_type" },
524  { "sequence", "select sequence pattern type", 0, AV_OPT_TYPE_CONST, {.i64=PT_SEQUENCE }, INT_MIN, INT_MAX, DEC, "pattern_type" },
525 
526  { "pixel_format", "set video pixel format", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
527  { "start_number", "set first number in the sequence", OFFSET(start_number), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, DEC },
528  { "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 },
529  { "video_size", "set video size", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, DEC },
530  { "frame_size", "force frame size in bytes", OFFSET(frame_size), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, DEC },
531  { "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" },
532  { "none", "none", 0, AV_OPT_TYPE_CONST, {.i64 = 0 }, 0, 2, DEC, "ts_type" },
533  { "sec", "second precision", 0, AV_OPT_TYPE_CONST, {.i64 = 1 }, 0, 2, DEC, "ts_type" },
534  { "ns", "nano second precision", 0, AV_OPT_TYPE_CONST, {.i64 = 2 }, 0, 2, DEC, "ts_type" },
535  { NULL },
536 };
537 
538 #if CONFIG_IMAGE2_DEMUXER
539 static const AVClass img2_class = {
540  .class_name = "image2 demuxer",
541  .item_name = av_default_item_name,
542  .option = ff_img_options,
543  .version = LIBAVUTIL_VERSION_INT,
544 };
545 AVInputFormat ff_image2_demuxer = {
546  .name = "image2",
547  .long_name = NULL_IF_CONFIG_SMALL("image2 sequence"),
548  .priv_data_size = sizeof(VideoDemuxData),
554  .flags = AVFMT_NOFILE,
555  .priv_class = &img2_class,
556 };
557 #endif
558 #if CONFIG_IMAGE2PIPE_DEMUXER
559 static const AVClass img2pipe_class = {
560  .class_name = "image2pipe demuxer",
561  .item_name = av_default_item_name,
562  .option = ff_img_options,
563  .version = LIBAVUTIL_VERSION_INT,
564 };
565 AVInputFormat ff_image2pipe_demuxer = {
566  .name = "image2pipe",
567  .long_name = NULL_IF_CONFIG_SMALL("piped image2 sequence"),
568  .priv_data_size = sizeof(VideoDemuxData),
571  .priv_class = &img2pipe_class,
572 };
573 #endif
574 
575 static int bmp_probe(AVProbeData *p)
576 {
577  const uint8_t *b = p->buf;
578  int ihsize;
579 
580  if (AV_RB16(b) != 0x424d)
581  return 0;
582 
583  ihsize = AV_RL32(b+14);
584  if (ihsize < 12 || ihsize > 255)
585  return 0;
586 
587  if (!AV_RN32(b + 6)) {
588  return AVPROBE_SCORE_EXTENSION - 1; // lower than extension as bmp pipe has bugs
589  } else {
590  return AVPROBE_SCORE_EXTENSION / 4;
591  }
592  return 0;
593 }
594 
595 static int dpx_probe(AVProbeData *p)
596 {
597  const uint8_t *b = p->buf;
598 
599  if (AV_RN32(b) == AV_RN32("SDPX") || AV_RN32(b) == AV_RN32("XPDS"))
600  return AVPROBE_SCORE_EXTENSION + 1;
601  return 0;
602 }
603 
604 static int exr_probe(AVProbeData *p)
605 {
606  const uint8_t *b = p->buf;
607 
608  if (AV_RL32(b) == 20000630)
609  return AVPROBE_SCORE_EXTENSION + 1;
610  return 0;
611 }
612 
613 static int j2k_probe(AVProbeData *p)
614 {
615  const uint8_t *b = p->buf;
616 
617  if (AV_RB64(b) == 0x0000000c6a502020 ||
618  AV_RB32(b) == 0xff4fff51)
619  return AVPROBE_SCORE_EXTENSION + 1;
620  return 0;
621 }
622 
623 static int jpeg_probe(AVProbeData *p)
624 {
625  const uint8_t *b = p->buf;
626  int i, state = 0xD8;
627 
628  if (AV_RB16(b) != 0xFFD8 ||
629  AV_RB32(b) == 0xFFD8FFF7)
630  return 0;
631 
632  b += 2;
633  for (i = 0; i < p->buf_size - 2; i++) {
634  int c;
635  if (b[i] != 0xFF)
636  continue;
637  c = b[i + 1];
638  switch (c) {
639  case 0xD8:
640  return 0;
641  case 0xC0:
642  case 0xC1:
643  case 0xC2:
644  case 0xC3:
645  case 0xC5:
646  case 0xC6:
647  case 0xC7:
648  if (state != 0xD8)
649  return 0;
650  state = 0xC0;
651  break;
652  case 0xDA:
653  if (state != 0xC0)
654  return 0;
655  state = 0xDA;
656  break;
657  case 0xD9:
658  if (state != 0xDA)
659  return 0;
660  state = 0xD9;
661  break;
662  default:
663  if ( (c >= 0x02 && c <= 0xBF)
664  || c == 0xC8)
665  return 0;
666  }
667  }
668 
669  if (state == 0xD9)
670  return AVPROBE_SCORE_EXTENSION + 1;
671  return AVPROBE_SCORE_EXTENSION / 8;
672 }
673 
674 static int jpegls_probe(AVProbeData *p)
675 {
676  const uint8_t *b = p->buf;
677 
678  if (AV_RB32(b) == 0xffd8fff7)
679  return AVPROBE_SCORE_EXTENSION + 1;
680  return 0;
681 }
682 
683 static int pictor_probe(AVProbeData *p)
684 {
685  const uint8_t *b = p->buf;
686 
687  if (AV_RL16(b) == 0x1234)
688  return AVPROBE_SCORE_EXTENSION / 4;
689  return 0;
690 }
691 
692 static int png_probe(AVProbeData *p)
693 {
694  const uint8_t *b = p->buf;
695 
696  if (AV_RB64(b) == 0x89504e470d0a1a0a)
697  return AVPROBE_SCORE_MAX - 1;
698  return 0;
699 }
700 
701 static int sgi_probe(AVProbeData *p)
702 {
703  const uint8_t *b = p->buf;
704 
705  if (AV_RB16(b) == 474 &&
706  (b[2] & ~1) == 0 &&
707  (b[3] & ~3) == 0 && b[3] &&
708  (AV_RB16(b + 4) & ~7) == 0 && AV_RB16(b + 4))
709  return AVPROBE_SCORE_EXTENSION + 1;
710  return 0;
711 }
712 
714 {
715  const uint8_t *b = p->buf;
716 
717  if (AV_RB32(b) == 0x59a66a95)
718  return AVPROBE_SCORE_EXTENSION + 1;
719  return 0;
720 }
721 
722 static int tiff_probe(AVProbeData *p)
723 {
724  const uint8_t *b = p->buf;
725 
726  if (AV_RB32(b) == 0x49492a00 ||
727  AV_RB32(b) == 0x4D4D002a)
728  return AVPROBE_SCORE_EXTENSION + 1;
729  return 0;
730 }
731 
732 static int webp_probe(AVProbeData *p)
733 {
734  const uint8_t *b = p->buf;
735 
736  if (AV_RB32(b) == 0x52494646 &&
737  AV_RB32(b + 8) == 0x57454250)
738  return AVPROBE_SCORE_MAX - 1;
739  return 0;
740 }
741 
742 #define IMAGEAUTO_DEMUXER(imgname, codecid)\
743 static const AVClass imgname ## _class = {\
744  .class_name = AV_STRINGIFY(imgname) " demuxer",\
745  .item_name = av_default_item_name,\
746  .option = ff_img_options,\
747  .version = LIBAVUTIL_VERSION_INT,\
748 };\
749 AVInputFormat ff_image_ ## imgname ## _pipe_demuxer = {\
750  .name = AV_STRINGIFY(imgname) "_pipe",\
751  .long_name = NULL_IF_CONFIG_SMALL("piped " AV_STRINGIFY(imgname) " sequence"),\
752  .priv_data_size = sizeof(VideoDemuxData),\
753  .read_probe = imgname ## _probe,\
754  .read_header = ff_img_read_header,\
755  .read_packet = ff_img_read_packet,\
756  .priv_class = & imgname ## _class,\
757  .flags = AVFMT_GENERIC_INDEX, \
758  .raw_codec_id = codecid,\
759 };
760