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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 #include <sys/stat.h>
24 #include "libavutil/avstring.h"
25 #include "libavutil/log.h"
26 #include "libavutil/opt.h"
27 #include "libavutil/pixdesc.h"
28 #include "libavutil/parseutils.h"
29 #include "avformat.h"
30 #include "internal.h"
31 #if HAVE_GLOB
32 #include <glob.h>
33 
34 /* Locally define as 0 (bitwise-OR no-op) any missing glob options that
35  are non-posix glibc/bsd extensions. */
36 #ifndef GLOB_NOMAGIC
37 #define GLOB_NOMAGIC 0
38 #endif
39 #ifndef GLOB_BRACE
40 #define GLOB_BRACE 0
41 #endif
42 
43 #endif /* HAVE_GLOB */
44 
45 typedef struct {
46  const AVClass *class; /**< Class for private options. */
47  int img_first;
48  int img_last;
50  int64_t pts;
51  int img_count;
52  int is_pipe;
53  int split_planes; /**< use independent file for each Y, U, V plane */
54  char path[1024];
55  char *pixel_format; /**< Set by a private option. */
56  int width, height; /**< Set by a private option. */
57  AVRational framerate; /**< Set by a private option. */
58  int loop;
59  enum { PT_GLOB_SEQUENCE, PT_GLOB, PT_SEQUENCE } pattern_type;
60  int use_glob;
61 #if HAVE_GLOB
62  glob_t globstate;
63 #endif
69 
70 static const int sizes[][2] = {
71  { 640, 480 },
72  { 720, 480 },
73  { 720, 576 },
74  { 352, 288 },
75  { 352, 240 },
76  { 160, 128 },
77  { 512, 384 },
78  { 640, 352 },
79  { 640, 240 },
80 };
81 
82 static int infer_size(int *width_ptr, int *height_ptr, int size)
83 {
84  int i;
85 
86  for (i = 0; i < FF_ARRAY_ELEMS(sizes); i++) {
87  if ((sizes[i][0] * sizes[i][1]) == size) {
88  *width_ptr = sizes[i][0];
89  *height_ptr = sizes[i][1];
90  return 0;
91  }
92  }
93 
94  return -1;
95 }
96 
97 static int is_glob(const char *path)
98 {
99 #if HAVE_GLOB
100  size_t span = 0;
101  const char *p = path;
102 
103  while (p = strchr(p, '%')) {
104  if (*(++p) == '%') {
105  ++p;
106  continue;
107  }
108  if (span = strspn(p, "*?[]{}"))
109  break;
110  }
111  /* Did we hit a glob char or get to the end? */
112  return span != 0;
113 #else
114  return 0;
115 #endif
116 }
117 
118 /**
119  * Get index range of image files matched by path.
120  *
121  * @param pfirst_index pointer to index updated with the first number in the range
122  * @param plast_index pointer to index updated with the last number in the range
123  * @param path path which has to be matched by the image files in the range
124  * @param start_index minimum accepted value for the first index in the range
125  * @return -1 if no image file could be found
126  */
127 static int find_image_range(int *pfirst_index, int *plast_index,
128  const char *path, int start_index, int start_index_range)
129 {
130  char buf[1024];
131  int range, last_index, range1, first_index;
132 
133  /* find the first image */
134  for (first_index = start_index; first_index < start_index + start_index_range; first_index++) {
135  if (av_get_frame_filename(buf, sizeof(buf), path, first_index) < 0) {
136  *pfirst_index =
137  *plast_index = 1;
138  if (avio_check(buf, AVIO_FLAG_READ) > 0)
139  return 0;
140  return -1;
141  }
142  if (avio_check(buf, AVIO_FLAG_READ) > 0)
143  break;
144  }
145  if (first_index == start_index + start_index_range)
146  goto fail;
147 
148  /* find the last image */
149  last_index = first_index;
150  for (;;) {
151  range = 0;
152  for (;;) {
153  if (!range)
154  range1 = 1;
155  else
156  range1 = 2 * range;
157  if (av_get_frame_filename(buf, sizeof(buf), path,
158  last_index + range1) < 0)
159  goto fail;
160  if (avio_check(buf, AVIO_FLAG_READ) <= 0)
161  break;
162  range = range1;
163  /* just in case... */
164  if (range >= (1 << 30))
165  goto fail;
166  }
167  /* we are sure than image last_index + range exists */
168  if (!range)
169  break;
170  last_index += range;
171  }
172  *pfirst_index = first_index;
173  *plast_index = last_index;
174  return 0;
175 
176 fail:
177  return -1;
178 }
179 
181 {
182  if (p->filename && ff_guess_image2_codec(p->filename)) {
184  return AVPROBE_SCORE_MAX;
185  else if (is_glob(p->filename))
186  return AVPROBE_SCORE_MAX;
187  else if (av_match_ext(p->filename, "raw") || av_match_ext(p->filename, "gif"))
188  return 5;
189  else
191  }
192  return 0;
193 }
194 
196 {
197  VideoDemuxData *s = s1->priv_data;
198  int first_index, last_index;
199  AVStream *st;
201 
203 
204  st = avformat_new_stream(s1, NULL);
205  if (!st) {
206  return AVERROR(ENOMEM);
207  }
208 
209  if (s->pixel_format &&
210  (pix_fmt = av_get_pix_fmt(s->pixel_format)) == AV_PIX_FMT_NONE) {
211  av_log(s1, AV_LOG_ERROR, "No such pixel format: %s.\n",
212  s->pixel_format);
213  return AVERROR(EINVAL);
214  }
215 
216  av_strlcpy(s->path, s1->filename, sizeof(s->path));
217  s->img_number = 0;
218  s->img_count = 0;
219 
220  /* find format */
221  if (s1->iformat->flags & AVFMT_NOFILE)
222  s->is_pipe = 0;
223  else {
224  s->is_pipe = 1;
226  }
227 
228  if (s->ts_from_file)
229  avpriv_set_pts_info(st, 64, 1, 1);
230  else
232 
233  if (s->width && s->height) {
234  st->codec->width = s->width;
235  st->codec->height = s->height;
236  }
237 
238  if (!s->is_pipe) {
239  if (s->pattern_type == PT_GLOB_SEQUENCE) {
240  s->use_glob = is_glob(s->path);
241  if (s->use_glob) {
242  char *p = s->path, *q, *dup;
243  int gerr;
244 
245  av_log(s1, AV_LOG_WARNING, "Pattern type 'glob_sequence' is deprecated: "
246  "use pattern_type 'glob' instead\n");
247 #if HAVE_GLOB
248  dup = q = av_strdup(p);
249  while (*q) {
250  /* Do we have room for the next char and a \ insertion? */
251  if ((p - s->path) >= (sizeof(s->path) - 2))
252  break;
253  if (*q == '%' && strspn(q + 1, "%*?[]{}"))
254  ++q;
255  else if (strspn(q, "\\*?[]{}"))
256  *p++ = '\\';
257  *p++ = *q++;
258  }
259  *p = 0;
260  av_free(dup);
261 
262  gerr = glob(s->path, GLOB_NOCHECK|GLOB_BRACE|GLOB_NOMAGIC, NULL, &s->globstate);
263  if (gerr != 0) {
264  return AVERROR(ENOENT);
265  }
266  first_index = 0;
267  last_index = s->globstate.gl_pathc - 1;
268 #endif
269  }
270  }
271  if ((s->pattern_type == PT_GLOB_SEQUENCE && !s->use_glob) || s->pattern_type == PT_SEQUENCE) {
272  if (find_image_range(&first_index, &last_index, s->path,
273  s->start_number, s->start_number_range) < 0) {
274  av_log(s1, AV_LOG_ERROR,
275  "Could find no file with path '%s' and index in the range %d-%d\n",
276  s->path, s->start_number, s->start_number + s->start_number_range - 1);
277  return AVERROR(ENOENT);
278  }
279  } else if (s->pattern_type == PT_GLOB) {
280 #if HAVE_GLOB
281  int gerr;
282  gerr = glob(s->path, GLOB_NOCHECK|GLOB_BRACE|GLOB_NOMAGIC, NULL, &s->globstate);
283  if (gerr != 0) {
284  return AVERROR(ENOENT);
285  }
286  first_index = 0;
287  last_index = s->globstate.gl_pathc - 1;
288  s->use_glob = 1;
289 #else
290  av_log(s1, AV_LOG_ERROR,
291  "Pattern type 'glob' was selected but globbing "
292  "is not supported by this libavformat build\n");
293  return AVERROR(ENOSYS);
294 #endif
295  } else if (s->pattern_type != PT_GLOB_SEQUENCE) {
296  av_log(s1, AV_LOG_ERROR,
297  "Unknown value '%d' for pattern_type option\n", s->pattern_type);
298  return AVERROR(EINVAL);
299  }
300  s->img_first = first_index;
301  s->img_last = last_index;
302  s->img_number = first_index;
303  /* compute duration */
304  if (!s->ts_from_file) {
305  st->start_time = 0;
306  st->duration = last_index - first_index + 1;
307  }
308  }
309 
310  if (s1->video_codec_id) {
312  st->codec->codec_id = s1->video_codec_id;
313  } else if (s1->audio_codec_id) {
315  st->codec->codec_id = s1->audio_codec_id;
316  } else {
317  const char *str = strrchr(s->path, '.');
318  s->split_planes = str && !av_strcasecmp(str + 1, "y");
321  if (st->codec->codec_id == AV_CODEC_ID_LJPEG)
323  }
324  if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
325  pix_fmt != AV_PIX_FMT_NONE)
326  st->codec->pix_fmt = pix_fmt;
327 
328  return 0;
329 }
330 
332 {
333  VideoDemuxData *s = s1->priv_data;
334  char filename_bytes[1024];
335  char *filename = filename_bytes;
336  int i;
337  int size[3] = { 0 }, ret[3] = { 0 };
338  AVIOContext *f[3] = { NULL };
339  AVCodecContext *codec = s1->streams[0]->codec;
340 
341  if (!s->is_pipe) {
342  /* loop over input */
343  if (s->loop && s->img_number > s->img_last) {
344  s->img_number = s->img_first;
345  }
346  if (s->img_number > s->img_last)
347  return AVERROR_EOF;
348  if (s->use_glob) {
349 #if HAVE_GLOB
350  filename = s->globstate.gl_pathv[s->img_number];
351 #endif
352  } else {
353  if (av_get_frame_filename(filename_bytes, sizeof(filename_bytes),
354  s->path,
355  s->img_number) < 0 && s->img_number > 1)
356  return AVERROR(EIO);
357  }
358  for (i = 0; i < 3; i++) {
359  if (avio_open2(&f[i], filename, AVIO_FLAG_READ,
360  &s1->interrupt_callback, NULL) < 0) {
361  if (i >= 1)
362  break;
363  av_log(s1, AV_LOG_ERROR, "Could not open file : %s\n",
364  filename);
365  return AVERROR(EIO);
366  }
367  size[i] = avio_size(f[i]);
368 
369  if (!s->split_planes)
370  break;
371  filename[strlen(filename) - 1] = 'U' + i;
372  }
373 
374  if (codec->codec_id == AV_CODEC_ID_RAWVIDEO && !codec->width)
375  infer_size(&codec->width, &codec->height, size[0]);
376  } else {
377  f[0] = s1->pb;
378  if (url_feof(f[0]))
379  return AVERROR(EIO);
380  if (s->frame_size > 0) {
381  size[0] = s->frame_size;
382  } else {
383  size[0] = 4096;
384  }
385  }
386 
387  if (av_new_packet(pkt, size[0] + size[1] + size[2]) < 0)
388  return AVERROR(ENOMEM);
389  pkt->stream_index = 0;
390  pkt->flags |= AV_PKT_FLAG_KEY;
391  if (s->ts_from_file) {
392  struct stat img_stat;
393  if (stat(filename, &img_stat))
394  return AVERROR(EIO);
395  pkt->pts = (int64_t)img_stat.st_mtime;
396  av_add_index_entry(s1->streams[0], s->img_number, pkt->pts, 0, 0, AVINDEX_KEYFRAME);
397  } else if (!s->is_pipe) {
398  pkt->pts = s->pts;
399  }
400 
401  pkt->size = 0;
402  for (i = 0; i < 3; i++) {
403  if (f[i]) {
404  ret[i] = avio_read(f[i], pkt->data + pkt->size, size[i]);
405  if (!s->is_pipe)
406  avio_close(f[i]);
407  if (ret[i] > 0)
408  pkt->size += ret[i];
409  }
410  }
411 
412  if (ret[0] <= 0 || ret[1] < 0 || ret[2] < 0) {
413  av_free_packet(pkt);
414  return AVERROR(EIO); /* signal EOF */
415  } else {
416  s->img_count++;
417  s->img_number++;
418  s->pts++;
419  return 0;
420  }
421 }
422 
423 static int img_read_close(struct AVFormatContext* s1)
424 {
425  VideoDemuxData *s = s1->priv_data;
426 #if HAVE_GLOB
427  if (s->use_glob) {
428  globfree(&s->globstate);
429  }
430 #endif
431  return 0;
432 }
433 
434 static int img_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
435 {
437  AVStream *st = s->streams[0];
438 
439  if (s1->ts_from_file) {
440  int index = av_index_search_timestamp(st, timestamp, flags);
441  if(index < 0)
442  return -1;
443  s1->img_number = st->index_entries[index].pos;
444  return 0;
445  }
446 
447  if (timestamp < 0 || !s1->loop && timestamp > s1->img_last - s1->img_first)
448  return -1;
449  s1->img_number = timestamp%(s1->img_last - s1->img_first + 1) + s1->img_first;
450  s1->pts = timestamp;
451  return 0;
452 }
453 
454 #define OFFSET(x) offsetof(VideoDemuxData, x)
455 #define DEC AV_OPT_FLAG_DECODING_PARAM
456 static const AVOption options[] = {
457  { "framerate", "set the video framerate", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, 0, DEC },
458  { "loop", "force loop over input file sequence", OFFSET(loop), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 1, DEC },
459 
460  { "pattern_type", "set pattern type", OFFSET(pattern_type), AV_OPT_TYPE_INT, {.i64=PT_GLOB_SEQUENCE}, 0, INT_MAX, DEC, "pattern_type"},
461  { "glob_sequence","select glob/sequence pattern type", 0, AV_OPT_TYPE_CONST, {.i64=PT_GLOB_SEQUENCE}, INT_MIN, INT_MAX, DEC, "pattern_type" },
462  { "glob", "select glob pattern type", 0, AV_OPT_TYPE_CONST, {.i64=PT_GLOB }, INT_MIN, INT_MAX, DEC, "pattern_type" },
463  { "sequence", "select sequence pattern type", 0, AV_OPT_TYPE_CONST, {.i64=PT_SEQUENCE }, INT_MIN, INT_MAX, DEC, "pattern_type" },
464 
465  { "pixel_format", "set video pixel format", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
466  { "start_number", "set first number in the sequence", OFFSET(start_number), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, DEC },
467  { "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 },
468  { "video_size", "set video size", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, DEC },
469  { "frame_size", "force frame size in bytes", OFFSET(frame_size), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, DEC },
470  { "ts_from_file", "set frame timestamp from file's one", OFFSET(ts_from_file), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 1, DEC },
471  { NULL },
472 };
473 
474 #if CONFIG_IMAGE2_DEMUXER
475 static const AVClass img2_class = {
476  .class_name = "image2 demuxer",
477  .item_name = av_default_item_name,
478  .option = options,
479  .version = LIBAVUTIL_VERSION_INT,
480 };
481 AVInputFormat ff_image2_demuxer = {
482  .name = "image2",
483  .long_name = NULL_IF_CONFIG_SMALL("image2 sequence"),
484  .priv_data_size = sizeof(VideoDemuxData),
490  .flags = AVFMT_NOFILE,
491  .priv_class = &img2_class,
492 };
493 #endif
494 #if CONFIG_IMAGE2PIPE_DEMUXER
495 static const AVClass img2pipe_class = {
496  .class_name = "image2pipe demuxer",
497  .item_name = av_default_item_name,
498  .option = options,
499  .version = LIBAVUTIL_VERSION_INT,
500 };
501 AVInputFormat ff_image2pipe_demuxer = {
502  .name = "image2pipe",
503  .long_name = NULL_IF_CONFIG_SMALL("piped image2 sequence"),
504  .priv_data_size = sizeof(VideoDemuxData),
507  .priv_class = &img2pipe_class,
508 };
509 #endif