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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 "libavutil/avstring.h"
24 #include "libavutil/log.h"
25 #include "libavutil/opt.h"
26 #include "libavutil/pixdesc.h"
27 #include "libavutil/parseutils.h"
28 #include "avformat.h"
29 #include "internal.h"
30 #if HAVE_GLOB
31 #include <glob.h>
32 
33 /* Locally define as 0 (bitwise-OR no-op) any missing glob options that
34  are non-posix glibc/bsd extensions. */
35 #ifndef GLOB_NOMAGIC
36 #define GLOB_NOMAGIC 0
37 #endif
38 #ifndef GLOB_BRACE
39 #define GLOB_BRACE 0
40 #endif
41 
42 #endif /* HAVE_GLOB */
43 
44 typedef struct {
45  const AVClass *class; /**< Class for private options. */
46  int img_first;
47  int img_last;
49  int64_t pts;
50  int img_count;
51  int is_pipe;
52  int split_planes; /**< use independent file for each Y, U, V plane */
53  char path[1024];
54  char *pixel_format; /**< Set by a private option. */
55  char *video_size; /**< Set by a private option. */
56  char *framerate; /**< Set by a private option. */
57  int loop;
58  enum { PT_GLOB_SEQUENCE, PT_GLOB, PT_SEQUENCE } pattern_type;
59  int use_glob;
60 #if HAVE_GLOB
61  glob_t globstate;
62 #endif
67 
68 static const int sizes[][2] = {
69  { 640, 480 },
70  { 720, 480 },
71  { 720, 576 },
72  { 352, 288 },
73  { 352, 240 },
74  { 160, 128 },
75  { 512, 384 },
76  { 640, 352 },
77  { 640, 240 },
78 };
79 
80 static int infer_size(int *width_ptr, int *height_ptr, int size)
81 {
82  int i;
83 
84  for (i = 0; i < FF_ARRAY_ELEMS(sizes); i++) {
85  if ((sizes[i][0] * sizes[i][1]) == size) {
86  *width_ptr = sizes[i][0];
87  *height_ptr = sizes[i][1];
88  return 0;
89  }
90  }
91 
92  return -1;
93 }
94 
95 static int is_glob(const char *path)
96 {
97 #if HAVE_GLOB
98  size_t span = 0;
99  const char *p = path;
100 
101  while (p = strchr(p, '%')) {
102  if (*(++p) == '%') {
103  ++p;
104  continue;
105  }
106  if (span = strspn(p, "*?[]{}"))
107  break;
108  }
109  /* Did we hit a glob char or get to the end? */
110  return span != 0;
111 #else
112  return 0;
113 #endif
114 }
115 
116 /**
117  * Get index range of image files matched by path.
118  *
119  * @param pfirst_index pointer to index updated with the first number in the range
120  * @param plast_index pointer to index updated with the last number in the range
121  * @param path path which has to be matched by the image files in the range
122  * @param start_index minimum accepted value for the first index in the range
123  * @return -1 if no image file could be found
124  */
125 static int find_image_range(int *pfirst_index, int *plast_index,
126  const char *path, int start_index, int start_index_range)
127 {
128  char buf[1024];
129  int range, last_index, range1, first_index;
130 
131  /* find the first image */
132  for (first_index = start_index; first_index < start_index + start_index_range; first_index++) {
133  if (av_get_frame_filename(buf, sizeof(buf), path, first_index) < 0) {
134  *pfirst_index =
135  *plast_index = 1;
136  if (avio_check(buf, AVIO_FLAG_READ) > 0)
137  return 0;
138  return -1;
139  }
140  if (avio_check(buf, AVIO_FLAG_READ) > 0)
141  break;
142  }
143  if (first_index == start_index + start_index_range)
144  goto fail;
145 
146  /* find the last image */
147  last_index = first_index;
148  for (;;) {
149  range = 0;
150  for (;;) {
151  if (!range)
152  range1 = 1;
153  else
154  range1 = 2 * range;
155  if (av_get_frame_filename(buf, sizeof(buf), path,
156  last_index + range1) < 0)
157  goto fail;
158  if (avio_check(buf, AVIO_FLAG_READ) <= 0)
159  break;
160  range = range1;
161  /* just in case... */
162  if (range >= (1 << 30))
163  goto fail;
164  }
165  /* we are sure than image last_index + range exists */
166  if (!range)
167  break;
168  last_index += range;
169  }
170  *pfirst_index = first_index;
171  *plast_index = last_index;
172  return 0;
173 
174 fail:
175  return -1;
176 }
177 
179 {
180  if (p->filename && ff_guess_image2_codec(p->filename)) {
182  return AVPROBE_SCORE_MAX;
183  else if (is_glob(p->filename))
184  return AVPROBE_SCORE_MAX;
185  else if (av_match_ext(p->filename, "raw") || av_match_ext(p->filename, "gif"))
186  return 5;
187  else
188  return AVPROBE_SCORE_MAX / 2;
189  }
190  return 0;
191 }
192 
194 {
195  VideoDemuxData *s = s1->priv_data;
196  int first_index, last_index, ret = 0;
197  int width = 0, height = 0;
198  AVStream *st;
200  AVRational framerate;
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  if (s->video_size &&
216  (ret = av_parse_video_size(&width, &height, s->video_size)) < 0) {
217  av_log(s, AV_LOG_ERROR,
218  "Could not parse video size: %s.\n", s->video_size);
219  return ret;
220  }
221  if ((ret = av_parse_video_rate(&framerate, s->framerate)) < 0) {
222  av_log(s, AV_LOG_ERROR,
223  "Could not parse framerate: %s.\n", s->framerate);
224  return ret;
225  }
226 
227  av_strlcpy(s->path, s1->filename, sizeof(s->path));
228  s->img_number = 0;
229  s->img_count = 0;
230 
231  /* find format */
232  if (s1->iformat->flags & AVFMT_NOFILE)
233  s->is_pipe = 0;
234  else {
235  s->is_pipe = 1;
237  }
238 
239  avpriv_set_pts_info(st, 60, framerate.den, framerate.num);
240 
241  if (width && height) {
242  st->codec->width = width;
243  st->codec->height = height;
244  }
245 
246  if (!s->is_pipe) {
247  if (s->pattern_type == PT_GLOB_SEQUENCE) {
248  s->use_glob = is_glob(s->path);
249  if (s->use_glob) {
250  char *p = s->path, *q, *dup;
251  int gerr;
252 
253  av_log(s1, AV_LOG_WARNING, "Pattern type 'glob_sequence' is deprecated: "
254  "use pattern_type 'glob' instead\n");
255 #if HAVE_GLOB
256  dup = q = av_strdup(p);
257  while (*q) {
258  /* Do we have room for the next char and a \ insertion? */
259  if ((p - s->path) >= (sizeof(s->path) - 2))
260  break;
261  if (*q == '%' && strspn(q + 1, "%*?[]{}"))
262  ++q;
263  else if (strspn(q, "\\*?[]{}"))
264  *p++ = '\\';
265  *p++ = *q++;
266  }
267  *p = 0;
268  av_free(dup);
269 
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 #endif
277  }
278  }
279  if ((s->pattern_type == PT_GLOB_SEQUENCE && !s->use_glob) || s->pattern_type == PT_SEQUENCE) {
280  if (find_image_range(&first_index, &last_index, s->path,
281  s->start_number, s->start_number_range) < 0) {
282  av_log(s1, AV_LOG_ERROR,
283  "Could find no file with with path '%s' and index in the range %d-%d\n",
284  s->path, s->start_number, s->start_number + s->start_number_range - 1);
285  return AVERROR(ENOENT);
286  }
287  } else if (s->pattern_type == PT_GLOB) {
288 #if HAVE_GLOB
289  int gerr;
290  gerr = glob(s->path, GLOB_NOCHECK|GLOB_BRACE|GLOB_NOMAGIC, NULL, &s->globstate);
291  if (gerr != 0) {
292  return AVERROR(ENOENT);
293  }
294  first_index = 0;
295  last_index = s->globstate.gl_pathc - 1;
296  s->use_glob = 1;
297 #else
298  av_log(s1, AV_LOG_ERROR,
299  "Pattern type 'glob' was selected but globbing "
300  "is not supported by this libavformat build\n");
301  return AVERROR(ENOSYS);
302 #endif
303  } else if (s->pattern_type != PT_GLOB_SEQUENCE) {
304  av_log(s1, AV_LOG_ERROR,
305  "Unknown value '%d' for pattern_type option\n", s->pattern_type);
306  return AVERROR(EINVAL);
307  }
308  s->img_first = first_index;
309  s->img_last = last_index;
310  s->img_number = first_index;
311  /* compute duration */
312  st->start_time = 0;
313  st->duration = last_index - first_index + 1;
314  }
315 
316  if (s1->video_codec_id) {
318  st->codec->codec_id = s1->video_codec_id;
319  } else if (s1->audio_codec_id) {
321  st->codec->codec_id = s1->audio_codec_id;
322  } else {
323  const char *str = strrchr(s->path, '.');
324  s->split_planes = str && !av_strcasecmp(str + 1, "y");
327  if (st->codec->codec_id == AV_CODEC_ID_LJPEG)
329  }
330  if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
331  pix_fmt != AV_PIX_FMT_NONE)
332  st->codec->pix_fmt = pix_fmt;
333 
334  return 0;
335 }
336 
338 {
339  VideoDemuxData *s = s1->priv_data;
340  char filename_bytes[1024];
341  char *filename = filename_bytes;
342  int i;
343  int size[3] = { 0 }, ret[3] = { 0 };
344  AVIOContext *f[3] = { NULL };
345  AVCodecContext *codec = s1->streams[0]->codec;
346 
347  if (!s->is_pipe) {
348  /* loop over input */
349  if (s->loop && s->img_number > s->img_last) {
350  s->img_number = s->img_first;
351  }
352  if (s->img_number > s->img_last)
353  return AVERROR_EOF;
354  if (s->use_glob) {
355 #if HAVE_GLOB
356  filename = s->globstate.gl_pathv[s->img_number];
357 #endif
358  } else {
359  if (av_get_frame_filename(filename_bytes, sizeof(filename_bytes),
360  s->path,
361  s->img_number) < 0 && s->img_number > 1)
362  return AVERROR(EIO);
363  }
364  for (i = 0; i < 3; i++) {
365  if (avio_open2(&f[i], filename, AVIO_FLAG_READ,
366  &s1->interrupt_callback, NULL) < 0) {
367  if (i >= 1)
368  break;
369  av_log(s1, AV_LOG_ERROR, "Could not open file : %s\n",
370  filename);
371  return AVERROR(EIO);
372  }
373  size[i] = avio_size(f[i]);
374 
375  if (!s->split_planes)
376  break;
377  filename[strlen(filename) - 1] = 'U' + i;
378  }
379 
380  if (codec->codec_id == AV_CODEC_ID_RAWVIDEO && !codec->width)
381  infer_size(&codec->width, &codec->height, size[0]);
382  } else {
383  f[0] = s1->pb;
384  if (url_feof(f[0]))
385  return AVERROR(EIO);
386  if (s->frame_size > 0) {
387  size[0] = s->frame_size;
388  } else {
389  size[0] = 4096;
390  }
391  }
392 
393  if (av_new_packet(pkt, size[0] + size[1] + size[2]) < 0)
394  return AVERROR(ENOMEM);
395  pkt->stream_index = 0;
396  pkt->flags |= AV_PKT_FLAG_KEY;
397  if (!s->is_pipe)
398  pkt->pts = s->pts;
399 
400  pkt->size = 0;
401  for (i = 0; i < 3; i++) {
402  if (f[i]) {
403  ret[i] = avio_read(f[i], pkt->data + pkt->size, size[i]);
404  if (!s->is_pipe)
405  avio_close(f[i]);
406  if (ret[i] > 0)
407  pkt->size += ret[i];
408  }
409  }
410 
411  if (ret[0] <= 0 || ret[1] < 0 || ret[2] < 0) {
412  av_free_packet(pkt);
413  return AVERROR(EIO); /* signal EOF */
414  } else {
415  s->img_count++;
416  s->img_number++;
417  s->pts++;
418  return 0;
419  }
420 }
421 
422 static int img_read_close(struct AVFormatContext* s1)
423 {
424  VideoDemuxData *s = s1->priv_data;
425 #if HAVE_GLOB
426  if (s->use_glob) {
427  globfree(&s->globstate);
428  }
429 #endif
430  return 0;
431 }
432 
433 static int img_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
434 {
436 
437  if (timestamp < 0 || !s1->loop && timestamp > s1->img_last - s1->img_first)
438  return -1;
439  s1->img_number = timestamp%(s1->img_last - s1->img_first + 1) + s1->img_first;
440  s1->pts = timestamp;
441  return 0;
442 }
443 
444 #define OFFSET(x) offsetof(VideoDemuxData, x)
445 #define DEC AV_OPT_FLAG_DECODING_PARAM
446 static const AVOption options[] = {
447  { "framerate", "set the video framerate", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = "25"}, 0, 0, DEC },
448  { "loop", "force loop over input file sequence", OFFSET(loop), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 1, DEC },
449 
450  { "pattern_type", "set pattern type", OFFSET(pattern_type), AV_OPT_TYPE_INT, {.i64=PT_GLOB_SEQUENCE}, 0, INT_MAX, DEC, "pattern_type"},
451  { "glob_sequence","select glob/sequence pattern type", 0, AV_OPT_TYPE_CONST, {.i64=PT_GLOB_SEQUENCE}, INT_MIN, INT_MAX, DEC, "pattern_type" },
452  { "glob", "select glob pattern type", 0, AV_OPT_TYPE_CONST, {.i64=PT_GLOB }, INT_MIN, INT_MAX, DEC, "pattern_type" },
453  { "sequence", "select sequence pattern type", 0, AV_OPT_TYPE_CONST, {.i64=PT_SEQUENCE }, INT_MIN, INT_MAX, DEC, "pattern_type" },
454 
455  { "pixel_format", "set video pixel format", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
456  { "start_number", "set first number in the sequence", OFFSET(start_number), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, DEC },
457  { "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 },
458  { "video_size", "set video size", OFFSET(video_size), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
459  { "frame_size", "force frame size in bytes", OFFSET(frame_size), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, DEC },
460  { NULL },
461 };
462 
463 #if CONFIG_IMAGE2_DEMUXER
464 static const AVClass img2_class = {
465  .class_name = "image2 demuxer",
466  .item_name = av_default_item_name,
467  .option = options,
468  .version = LIBAVUTIL_VERSION_INT,
469 };
470 AVInputFormat ff_image2_demuxer = {
471  .name = "image2",
472  .long_name = NULL_IF_CONFIG_SMALL("image2 sequence"),
473  .priv_data_size = sizeof(VideoDemuxData),
479  .flags = AVFMT_NOFILE,
480  .priv_class = &img2_class,
481 };
482 #endif
483 #if CONFIG_IMAGE2PIPE_DEMUXER
484 static const AVClass img2pipe_class = {
485  .class_name = "image2pipe demuxer",
486  .item_name = av_default_item_name,
487  .option = options,
488  .version = LIBAVUTIL_VERSION_INT,
489 };
490 AVInputFormat ff_image2pipe_demuxer = {
491  .name = "image2pipe",
492  .long_name = NULL_IF_CONFIG_SMALL("piped image2 sequence"),
493  .priv_data_size = sizeof(VideoDemuxData),
496  .priv_class = &img2pipe_class,
497 };
498 #endif