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src_movie.c
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1 /*
2  * Copyright (c) 2010 Stefano Sabatini
3  * Copyright (c) 2008 Victor Paesa
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * movie video source
25  *
26  * @todo use direct rendering (no allocation of a new frame)
27  * @todo support a PTS correction mechanism
28  */
29 
30 #include <float.h>
31 #include <stdint.h>
32 
33 #include "libavutil/attributes.h"
34 #include "libavutil/avstring.h"
35 #include "libavutil/avassert.h"
36 #include "libavutil/opt.h"
37 #include "libavutil/imgutils.h"
38 #include "libavutil/timestamp.h"
39 #include "libavformat/avformat.h"
40 #include "audio.h"
41 #include "avcodec.h"
42 #include "avfilter.h"
43 #include "formats.h"
44 #include "internal.h"
45 #include "video.h"
46 
47 typedef struct {
48  AVStream *st;
49  int done;
50 } MovieStream;
51 
52 typedef struct {
53  /* common A/V fields */
54  const AVClass *class;
55  int64_t seek_point; ///< seekpoint in microseconds
56  double seek_point_d;
57  char *format_name;
58  char *file_name;
59  char *stream_specs; /**< user-provided list of streams, separated by + */
60  int stream_index; /**< for compatibility */
61  int loop_count;
62 
63  AVFormatContext *format_ctx;
64  int eof;
65  AVPacket pkt, pkt0;
66  AVFrame *frame; ///< video frame to store the decoded images in
67 
68  int max_stream_index; /**< max stream # actually used for output */
69  MovieStream *st; /**< array of all streams, one per output */
70  int *out_index; /**< stream number -> output number map, or -1 */
71 } MovieContext;
72 
73 #define OFFSET(x) offsetof(MovieContext, x)
74 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_VIDEO_PARAM
75 
76 static const AVOption movie_options[]= {
77  { "filename", NULL, OFFSET(file_name), AV_OPT_TYPE_STRING, .flags = FLAGS },
78  { "format_name", "set format name", OFFSET(format_name), AV_OPT_TYPE_STRING, .flags = FLAGS },
79  { "f", "set format name", OFFSET(format_name), AV_OPT_TYPE_STRING, .flags = FLAGS },
80  { "stream_index", "set stream index", OFFSET(stream_index), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, FLAGS },
81  { "si", "set stream index", OFFSET(stream_index), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, FLAGS },
82  { "seek_point", "set seekpoint (seconds)", OFFSET(seek_point_d), AV_OPT_TYPE_DOUBLE, { .dbl = 0 }, 0, (INT64_MAX-1) / 1000000, FLAGS },
83  { "sp", "set seekpoint (seconds)", OFFSET(seek_point_d), AV_OPT_TYPE_DOUBLE, { .dbl = 0 }, 0, (INT64_MAX-1) / 1000000, FLAGS },
84  { "streams", "set streams", OFFSET(stream_specs), AV_OPT_TYPE_STRING, {.str = 0}, CHAR_MAX, CHAR_MAX, FLAGS },
85  { "s", "set streams", OFFSET(stream_specs), AV_OPT_TYPE_STRING, {.str = 0}, CHAR_MAX, CHAR_MAX, FLAGS },
86  { "loop", "set loop count", OFFSET(loop_count), AV_OPT_TYPE_INT, {.i64 = 1}, 0, INT_MAX, FLAGS },
87  { NULL },
88 };
89 
90 static int movie_config_output_props(AVFilterLink *outlink);
91 static int movie_request_frame(AVFilterLink *outlink);
92 
93 static AVStream *find_stream(void *log, AVFormatContext *avf, const char *spec)
94 {
95  int i, ret, already = 0, stream_id = -1;
96  char type_char[2], dummy;
97  AVStream *found = NULL;
98  enum AVMediaType type;
99 
100  ret = sscanf(spec, "d%1[av]%d%c", type_char, &stream_id, &dummy);
101  if (ret >= 1 && ret <= 2) {
102  type = type_char[0] == 'v' ? AVMEDIA_TYPE_VIDEO : AVMEDIA_TYPE_AUDIO;
103  ret = av_find_best_stream(avf, type, stream_id, -1, NULL, 0);
104  if (ret < 0) {
105  av_log(log, AV_LOG_ERROR, "No %s stream with index '%d' found\n",
106  av_get_media_type_string(type), stream_id);
107  return NULL;
108  }
109  return avf->streams[ret];
110  }
111  for (i = 0; i < avf->nb_streams; i++) {
112  ret = avformat_match_stream_specifier(avf, avf->streams[i], spec);
113  if (ret < 0) {
114  av_log(log, AV_LOG_ERROR,
115  "Invalid stream specifier \"%s\"\n", spec);
116  return NULL;
117  }
118  if (!ret)
119  continue;
120  if (avf->streams[i]->discard != AVDISCARD_ALL) {
121  already++;
122  continue;
123  }
124  if (found) {
125  av_log(log, AV_LOG_WARNING,
126  "Ambiguous stream specifier \"%s\", using #%d\n", spec, i);
127  break;
128  }
129  found = avf->streams[i];
130  }
131  if (!found) {
132  av_log(log, AV_LOG_WARNING, "Stream specifier \"%s\" %s\n", spec,
133  already ? "matched only already used streams" :
134  "did not match any stream");
135  return NULL;
136  }
137  if (found->codec->codec_type != AVMEDIA_TYPE_VIDEO &&
138  found->codec->codec_type != AVMEDIA_TYPE_AUDIO) {
139  av_log(log, AV_LOG_ERROR, "Stream specifier \"%s\" matched a %s stream,"
140  "currently unsupported by libavfilter\n", spec,
141  av_get_media_type_string(found->codec->codec_type));
142  return NULL;
143  }
144  return found;
145 }
146 
147 static int open_stream(void *log, MovieStream *st)
148 {
149  AVCodec *codec;
150  int ret;
151 
152  codec = avcodec_find_decoder(st->st->codec->codec_id);
153  if (!codec) {
154  av_log(log, AV_LOG_ERROR, "Failed to find any codec\n");
155  return AVERROR(EINVAL);
156  }
157 
158  st->st->codec->refcounted_frames = 1;
159 
160  if ((ret = avcodec_open2(st->st->codec, codec, NULL)) < 0) {
161  av_log(log, AV_LOG_ERROR, "Failed to open codec\n");
162  return ret;
163  }
164 
165  return 0;
166 }
167 
168 static int guess_channel_layout(MovieStream *st, int st_index, void *log_ctx)
169 {
170  AVCodecContext *dec_ctx = st->st->codec;
171  char buf[256];
172  int64_t chl = av_get_default_channel_layout(dec_ctx->channels);
173 
174  if (!chl) {
175  av_log(log_ctx, AV_LOG_ERROR,
176  "Channel layout is not set in stream %d, and could not "
177  "be guessed from the number of channels (%d)\n",
178  st_index, dec_ctx->channels);
179  return AVERROR(EINVAL);
180  }
181 
182  av_get_channel_layout_string(buf, sizeof(buf), dec_ctx->channels, chl);
183  av_log(log_ctx, AV_LOG_WARNING,
184  "Channel layout is not set in output stream %d, "
185  "guessed channel layout is '%s'\n",
186  st_index, buf);
187  dec_ctx->channel_layout = chl;
188  return 0;
189 }
190 
191 static av_cold int movie_common_init(AVFilterContext *ctx)
192 {
193  MovieContext *movie = ctx->priv;
194  AVInputFormat *iformat = NULL;
195  int64_t timestamp;
196  int nb_streams, ret, i;
197  char default_streams[16], *stream_specs, *spec, *cursor;
198  char name[16];
199  AVStream *st;
200 
201  if (!movie->file_name) {
202  av_log(ctx, AV_LOG_ERROR, "No filename provided!\n");
203  return AVERROR(EINVAL);
204  }
205 
206  movie->seek_point = movie->seek_point_d * 1000000 + 0.5;
207 
208  stream_specs = movie->stream_specs;
209  if (!stream_specs) {
210  snprintf(default_streams, sizeof(default_streams), "d%c%d",
211  !strcmp(ctx->filter->name, "amovie") ? 'a' : 'v',
212  movie->stream_index);
213  stream_specs = default_streams;
214  }
215  for (cursor = stream_specs, nb_streams = 1; *cursor; cursor++)
216  if (*cursor == '+')
217  nb_streams++;
218 
219  if (movie->loop_count != 1 && nb_streams != 1) {
220  av_log(ctx, AV_LOG_ERROR,
221  "Loop with several streams is currently unsupported\n");
222  return AVERROR_PATCHWELCOME;
223  }
224 
225  av_register_all();
226 
227  // Try to find the movie format (container)
228  iformat = movie->format_name ? av_find_input_format(movie->format_name) : NULL;
229 
230  movie->format_ctx = NULL;
231  if ((ret = avformat_open_input(&movie->format_ctx, movie->file_name, iformat, NULL)) < 0) {
232  av_log(ctx, AV_LOG_ERROR,
233  "Failed to avformat_open_input '%s'\n", movie->file_name);
234  return ret;
235  }
236  if ((ret = avformat_find_stream_info(movie->format_ctx, NULL)) < 0)
237  av_log(ctx, AV_LOG_WARNING, "Failed to find stream info\n");
238 
239  // if seeking requested, we execute it
240  if (movie->seek_point > 0) {
241  timestamp = movie->seek_point;
242  // add the stream start time, should it exist
243  if (movie->format_ctx->start_time != AV_NOPTS_VALUE) {
244  if (timestamp > INT64_MAX - movie->format_ctx->start_time) {
245  av_log(ctx, AV_LOG_ERROR,
246  "%s: seek value overflow with start_time:%"PRId64" seek_point:%"PRId64"\n",
247  movie->file_name, movie->format_ctx->start_time, movie->seek_point);
248  return AVERROR(EINVAL);
249  }
250  timestamp += movie->format_ctx->start_time;
251  }
252  if ((ret = av_seek_frame(movie->format_ctx, -1, timestamp, AVSEEK_FLAG_BACKWARD)) < 0) {
253  av_log(ctx, AV_LOG_ERROR, "%s: could not seek to position %"PRId64"\n",
254  movie->file_name, timestamp);
255  return ret;
256  }
257  }
258 
259  for (i = 0; i < movie->format_ctx->nb_streams; i++)
260  movie->format_ctx->streams[i]->discard = AVDISCARD_ALL;
261 
262  movie->st = av_calloc(nb_streams, sizeof(*movie->st));
263  if (!movie->st)
264  return AVERROR(ENOMEM);
265 
266  for (i = 0; i < nb_streams; i++) {
267  spec = av_strtok(stream_specs, "+", &cursor);
268  if (!spec)
269  return AVERROR_BUG;
270  stream_specs = NULL; /* for next strtok */
271  st = find_stream(ctx, movie->format_ctx, spec);
272  if (!st)
273  return AVERROR(EINVAL);
274  st->discard = AVDISCARD_DEFAULT;
275  movie->st[i].st = st;
276  movie->max_stream_index = FFMAX(movie->max_stream_index, st->index);
277  }
278  if (av_strtok(NULL, "+", &cursor))
279  return AVERROR_BUG;
280 
281  movie->out_index = av_calloc(movie->max_stream_index + 1,
282  sizeof(*movie->out_index));
283  if (!movie->out_index)
284  return AVERROR(ENOMEM);
285  for (i = 0; i <= movie->max_stream_index; i++)
286  movie->out_index[i] = -1;
287  for (i = 0; i < nb_streams; i++)
288  movie->out_index[movie->st[i].st->index] = i;
289 
290  for (i = 0; i < nb_streams; i++) {
291  AVFilterPad pad = { 0 };
292  snprintf(name, sizeof(name), "out%d", i);
293  pad.type = movie->st[i].st->codec->codec_type;
294  pad.name = av_strdup(name);
295  pad.config_props = movie_config_output_props;
296  pad.request_frame = movie_request_frame;
297  ff_insert_outpad(ctx, i, &pad);
298  ret = open_stream(ctx, &movie->st[i]);
299  if (ret < 0)
300  return ret;
301  if ( movie->st[i].st->codec->codec->type == AVMEDIA_TYPE_AUDIO &&
302  !movie->st[i].st->codec->channel_layout) {
303  ret = guess_channel_layout(&movie->st[i], i, ctx);
304  if (ret < 0)
305  return ret;
306  }
307  }
308 
309  av_log(ctx, AV_LOG_VERBOSE, "seek_point:%"PRIi64" format_name:%s file_name:%s stream_index:%d\n",
310  movie->seek_point, movie->format_name, movie->file_name,
311  movie->stream_index);
312 
313  return 0;
314 }
315 
316 static av_cold void movie_uninit(AVFilterContext *ctx)
317 {
318  MovieContext *movie = ctx->priv;
319  int i;
320 
321  for (i = 0; i < ctx->nb_outputs; i++) {
322  av_freep(&ctx->output_pads[i].name);
323  if (movie->st[i].st)
324  avcodec_close(movie->st[i].st->codec);
325  }
326  av_freep(&movie->st);
327  av_freep(&movie->out_index);
328  av_frame_free(&movie->frame);
329  if (movie->format_ctx)
330  avformat_close_input(&movie->format_ctx);
331 }
332 
333 static int movie_query_formats(AVFilterContext *ctx)
334 {
335  MovieContext *movie = ctx->priv;
336  int list[] = { 0, -1 };
337  int64_t list64[] = { 0, -1 };
338  int i;
339 
340  for (i = 0; i < ctx->nb_outputs; i++) {
341  MovieStream *st = &movie->st[i];
342  AVCodecContext *c = st->st->codec;
343  AVFilterLink *outlink = ctx->outputs[i];
344 
345  switch (c->codec_type) {
346  case AVMEDIA_TYPE_VIDEO:
347  list[0] = c->pix_fmt;
348  ff_formats_ref(ff_make_format_list(list), &outlink->in_formats);
349  break;
350  case AVMEDIA_TYPE_AUDIO:
351  list[0] = c->sample_fmt;
352  ff_formats_ref(ff_make_format_list(list), &outlink->in_formats);
353  list[0] = c->sample_rate;
354  ff_formats_ref(ff_make_format_list(list), &outlink->in_samplerates);
355  list64[0] = c->channel_layout;
356  ff_channel_layouts_ref(avfilter_make_format64_list(list64),
357  &outlink->in_channel_layouts);
358  break;
359  }
360  }
361 
362  return 0;
363 }
364 
365 static int movie_config_output_props(AVFilterLink *outlink)
366 {
367  AVFilterContext *ctx = outlink->src;
368  MovieContext *movie = ctx->priv;
369  unsigned out_id = FF_OUTLINK_IDX(outlink);
370  MovieStream *st = &movie->st[out_id];
371  AVCodecContext *c = st->st->codec;
372 
373  outlink->time_base = st->st->time_base;
374 
375  switch (c->codec_type) {
376  case AVMEDIA_TYPE_VIDEO:
377  outlink->w = c->width;
378  outlink->h = c->height;
379  outlink->frame_rate = st->st->r_frame_rate;
380  break;
381  case AVMEDIA_TYPE_AUDIO:
382  break;
383  }
384 
385  return 0;
386 }
387 
388 static char *describe_frame_to_str(char *dst, size_t dst_size,
389  AVFrame *frame, enum AVMediaType frame_type,
390  AVFilterLink *link)
391 {
392  switch (frame_type) {
393  case AVMEDIA_TYPE_VIDEO:
394  snprintf(dst, dst_size,
395  "video pts:%s time:%s size:%dx%d aspect:%d/%d",
396  av_ts2str(frame->pts), av_ts2timestr(frame->pts, &link->time_base),
397  frame->width, frame->height,
398  frame->sample_aspect_ratio.num,
399  frame->sample_aspect_ratio.den);
400  break;
401  case AVMEDIA_TYPE_AUDIO:
402  snprintf(dst, dst_size,
403  "audio pts:%s time:%s samples:%d",
404  av_ts2str(frame->pts), av_ts2timestr(frame->pts, &link->time_base),
405  frame->nb_samples);
406  break;
407  default:
408  snprintf(dst, dst_size, "%s BUG", av_get_media_type_string(frame_type));
409  break;
410  }
411  return dst;
412 }
413 
414 static int rewind_file(AVFilterContext *ctx)
415 {
416  MovieContext *movie = ctx->priv;
417  int64_t timestamp = movie->seek_point;
418  int ret, i;
419 
420  if (movie->format_ctx->start_time != AV_NOPTS_VALUE)
421  timestamp += movie->format_ctx->start_time;
422  ret = av_seek_frame(movie->format_ctx, -1, timestamp, AVSEEK_FLAG_BACKWARD);
423  if (ret < 0) {
424  av_log(ctx, AV_LOG_ERROR, "Unable to loop: %s\n", av_err2str(ret));
425  movie->loop_count = 1; /* do not try again */
426  return ret;
427  }
428 
429  for (i = 0; i < ctx->nb_outputs; i++) {
430  avcodec_flush_buffers(movie->st[i].st->codec);
431  movie->st[i].done = 0;
432  }
433  movie->eof = 0;
434  return 0;
435 }
436 
437 /**
438  * Try to push a frame to the requested output.
439  *
440  * @param ctx filter context
441  * @param out_id number of output where a frame is wanted;
442  * if the frame is read from file, used to set the return value;
443  * if the codec is being flushed, flush the corresponding stream
444  * @return 1 if a frame was pushed on the requested output,
445  * 0 if another attempt is possible,
446  * <0 AVERROR code
447  */
448 static int movie_push_frame(AVFilterContext *ctx, unsigned out_id)
449 {
450  MovieContext *movie = ctx->priv;
451  AVPacket *pkt = &movie->pkt;
452  enum AVMediaType frame_type;
453  MovieStream *st;
454  int ret, got_frame = 0, pkt_out_id;
455  AVFilterLink *outlink;
456 
457  if (!pkt->size) {
458  if (movie->eof) {
459  if (movie->st[out_id].done) {
460  if (movie->loop_count != 1) {
461  ret = rewind_file(ctx);
462  if (ret < 0)
463  return ret;
464  movie->loop_count -= movie->loop_count > 1;
465  av_log(ctx, AV_LOG_VERBOSE, "Stream finished, looping.\n");
466  return 0; /* retry */
467  }
468  return AVERROR_EOF;
469  }
470  pkt->stream_index = movie->st[out_id].st->index;
471  /* packet is already ready for flushing */
472  } else {
473  ret = av_read_frame(movie->format_ctx, &movie->pkt0);
474  if (ret < 0) {
475  av_init_packet(&movie->pkt0); /* ready for flushing */
476  *pkt = movie->pkt0;
477  if (ret == AVERROR_EOF) {
478  movie->eof = 1;
479  return 0; /* start flushing */
480  }
481  return ret;
482  }
483  *pkt = movie->pkt0;
484  }
485  }
486 
487  pkt_out_id = pkt->stream_index > movie->max_stream_index ? -1 :
488  movie->out_index[pkt->stream_index];
489  if (pkt_out_id < 0) {
490  av_free_packet(&movie->pkt0);
491  pkt->size = 0; /* ready for next run */
492  pkt->data = NULL;
493  return 0;
494  }
495  st = &movie->st[pkt_out_id];
496  outlink = ctx->outputs[pkt_out_id];
497 
498  movie->frame = av_frame_alloc();
499  if (!movie->frame)
500  return AVERROR(ENOMEM);
501 
502  frame_type = st->st->codec->codec_type;
503  switch (frame_type) {
504  case AVMEDIA_TYPE_VIDEO:
505  ret = avcodec_decode_video2(st->st->codec, movie->frame, &got_frame, pkt);
506  break;
507  case AVMEDIA_TYPE_AUDIO:
508  ret = avcodec_decode_audio4(st->st->codec, movie->frame, &got_frame, pkt);
509  break;
510  default:
511  ret = AVERROR(ENOSYS);
512  break;
513  }
514  if (ret < 0) {
515  av_log(ctx, AV_LOG_WARNING, "Decode error: %s\n", av_err2str(ret));
516  av_frame_free(&movie->frame);
517  av_free_packet(&movie->pkt0);
518  movie->pkt.size = 0;
519  movie->pkt.data = NULL;
520  return 0;
521  }
522  if (!ret || st->st->codec->codec_type == AVMEDIA_TYPE_VIDEO)
523  ret = pkt->size;
524 
525  pkt->data += ret;
526  pkt->size -= ret;
527  if (pkt->size <= 0) {
528  av_free_packet(&movie->pkt0);
529  pkt->size = 0; /* ready for next run */
530  pkt->data = NULL;
531  }
532  if (!got_frame) {
533  if (!ret)
534  st->done = 1;
535  av_frame_free(&movie->frame);
536  return 0;
537  }
538 
539  movie->frame->pts = av_frame_get_best_effort_timestamp(movie->frame);
540  av_dlog(ctx, "movie_push_frame(): file:'%s' %s\n", movie->file_name,
541  describe_frame_to_str((char[1024]){0}, 1024, movie->frame, frame_type, outlink));
542 
543  ret = ff_filter_frame(outlink, movie->frame);
544  movie->frame = NULL;
545 
546  if (ret < 0)
547  return ret;
548  return pkt_out_id == out_id;
549 }
550 
551 static int movie_request_frame(AVFilterLink *outlink)
552 {
553  AVFilterContext *ctx = outlink->src;
554  unsigned out_id = FF_OUTLINK_IDX(outlink);
555  int ret;
556 
557  while (1) {
558  ret = movie_push_frame(ctx, out_id);
559  if (ret)
560  return FFMIN(ret, 0);
561  }
562 }
563 
564 #if CONFIG_MOVIE_FILTER
565 
566 AVFILTER_DEFINE_CLASS(movie);
567 
568 AVFilter ff_avsrc_movie = {
569  .name = "movie",
570  .description = NULL_IF_CONFIG_SMALL("Read from a movie source."),
571  .priv_size = sizeof(MovieContext),
572  .priv_class = &movie_class,
573  .init = movie_common_init,
574  .uninit = movie_uninit,
575  .query_formats = movie_query_formats,
576 
577  .inputs = NULL,
578  .outputs = NULL,
579  .flags = AVFILTER_FLAG_DYNAMIC_OUTPUTS,
580 };
581 
582 #endif /* CONFIG_MOVIE_FILTER */
583 
584 #if CONFIG_AMOVIE_FILTER
585 
586 #define amovie_options movie_options
587 AVFILTER_DEFINE_CLASS(amovie);
588 
589 AVFilter ff_avsrc_amovie = {
590  .name = "amovie",
591  .description = NULL_IF_CONFIG_SMALL("Read audio from a movie source."),
592  .priv_size = sizeof(MovieContext),
593  .init = movie_common_init,
594  .uninit = movie_uninit,
595  .query_formats = movie_query_formats,
596 
597  .inputs = NULL,
598  .outputs = NULL,
599  .priv_class = &amovie_class,
600  .flags = AVFILTER_FLAG_DYNAMIC_OUTPUTS,
601 };
602 
603 #endif /* CONFIG_AMOVIE_FILTER */
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