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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 /* #define DEBUG */
31 
32 #include <float.h>
33 #include "libavutil/avstring.h"
34 #include "libavutil/avassert.h"
35 #include "libavutil/opt.h"
36 #include "libavutil/imgutils.h"
37 #include "libavutil/timestamp.h"
38 #include "libavformat/avformat.h"
39 #include "audio.h"
40 #include "avcodec.h"
41 #include "avfilter.h"
42 #include "formats.h"
43 #include "internal.h"
44 #include "video.h"
45 
46 typedef struct {
48  int done;
49 } MovieStream;
50 
51 typedef struct {
52  /* common A/V fields */
53  const AVClass *class;
54  int64_t seek_point; ///< seekpoint in microseconds
55  double seek_point_d;
56  char *format_name;
57  char *file_name;
58  char *stream_specs; /**< user-provided list of streams, separated by + */
59  int stream_index; /**< for compatibility */
61 
63  int eof;
65  AVFrame *frame; ///< video frame to store the decoded images in
66 
67  int max_stream_index; /**< max stream # actually used for output */
68  MovieStream *st; /**< array of all streams, one per output */
69  int *out_index; /**< stream number -> output number map, or -1 */
70 } MovieContext;
71 
72 #define OFFSET(x) offsetof(MovieContext, x)
73 #define F AV_OPT_FLAG_FILTERING_PARAM
74 
75 static const AVOption movie_options[]= {
76 {"format_name", "set format name", OFFSET(format_name), AV_OPT_TYPE_STRING, {.str = 0}, CHAR_MIN, CHAR_MAX, F },
77 {"f", "set format name", OFFSET(format_name), AV_OPT_TYPE_STRING, {.str = 0}, CHAR_MIN, CHAR_MAX, F },
78 {"streams", "set streams", OFFSET(stream_specs), AV_OPT_TYPE_STRING, {.str = 0}, CHAR_MAX, CHAR_MAX, F },
79 {"s", "set streams", OFFSET(stream_specs), AV_OPT_TYPE_STRING, {.str = 0}, CHAR_MAX, CHAR_MAX, F },
80 {"si", "set stream index", OFFSET(stream_index), AV_OPT_TYPE_INT, {.i64 = -1}, -1, INT_MAX, F },
81 {"stream_index", "set stream index", OFFSET(stream_index), AV_OPT_TYPE_INT, {.i64 = -1}, -1, INT_MAX, F },
82 {"seek_point", "set seekpoint (seconds)", OFFSET(seek_point_d), AV_OPT_TYPE_DOUBLE, {.dbl = 0}, 0, (INT64_MAX-1) / 1000000, F },
83 {"sp", "set seekpoint (seconds)", OFFSET(seek_point_d), AV_OPT_TYPE_DOUBLE, {.dbl = 0}, 0, (INT64_MAX-1) / 1000000, F },
84 {"loop", "set loop count", OFFSET(loop_count), AV_OPT_TYPE_INT, {.i64 = 1}, 0, INT_MAX, F },
85 {NULL},
86 };
87 
88 static int movie_config_output_props(AVFilterLink *outlink);
89 static int movie_request_frame(AVFilterLink *outlink);
90 
91 static AVStream *find_stream(void *log, AVFormatContext *avf, const char *spec)
92 {
93  int i, ret, already = 0, stream_id = -1;
94  char type_char[2], dummy;
95  AVStream *found = NULL;
96  enum AVMediaType type;
97 
98  ret = sscanf(spec, "d%1[av]%d%c", type_char, &stream_id, &dummy);
99  if (ret >= 1 && ret <= 2) {
100  type = type_char[0] == 'v' ? AVMEDIA_TYPE_VIDEO : AVMEDIA_TYPE_AUDIO;
101  ret = av_find_best_stream(avf, type, stream_id, -1, NULL, 0);
102  if (ret < 0) {
103  av_log(log, AV_LOG_ERROR, "No %s stream with index '%d' found\n",
104  av_get_media_type_string(type), stream_id);
105  return NULL;
106  }
107  return avf->streams[ret];
108  }
109  for (i = 0; i < avf->nb_streams; i++) {
110  ret = avformat_match_stream_specifier(avf, avf->streams[i], spec);
111  if (ret < 0) {
112  av_log(log, AV_LOG_ERROR,
113  "Invalid stream specifier \"%s\"\n", spec);
114  return NULL;
115  }
116  if (!ret)
117  continue;
118  if (avf->streams[i]->discard != AVDISCARD_ALL) {
119  already++;
120  continue;
121  }
122  if (found) {
123  av_log(log, AV_LOG_WARNING,
124  "Ambiguous stream specifier \"%s\", using #%d\n", spec, i);
125  break;
126  }
127  found = avf->streams[i];
128  }
129  if (!found) {
130  av_log(log, AV_LOG_WARNING, "Stream specifier \"%s\" %s\n", spec,
131  already ? "matched only already used streams" :
132  "did not match any stream");
133  return NULL;
134  }
135  if (found->codec->codec_type != AVMEDIA_TYPE_VIDEO &&
136  found->codec->codec_type != AVMEDIA_TYPE_AUDIO) {
137  av_log(log, AV_LOG_ERROR, "Stream specifier \"%s\" matched a %s stream,"
138  "currently unsupported by libavfilter\n", spec,
140  return NULL;
141  }
142  return found;
143 }
144 
145 static int open_stream(void *log, MovieStream *st)
146 {
147  AVCodec *codec;
148  int ret;
149 
150  codec = avcodec_find_decoder(st->st->codec->codec_id);
151  if (!codec) {
152  av_log(log, AV_LOG_ERROR, "Failed to find any codec\n");
153  return AVERROR(EINVAL);
154  }
155 
156  if ((ret = avcodec_open2(st->st->codec, codec, NULL)) < 0) {
157  av_log(log, AV_LOG_ERROR, "Failed to open codec\n");
158  return ret;
159  }
160 
161  return 0;
162 }
163 
164 static int guess_channel_layout(MovieStream *st, int st_index, void *log_ctx)
165 {
166  AVCodecContext *dec_ctx = st->st->codec;
167  char buf[256];
168  int64_t chl = av_get_default_channel_layout(dec_ctx->channels);
169 
170  if (!chl) {
171  av_log(log_ctx, AV_LOG_ERROR,
172  "Channel layout is not set in stream %d, and could not "
173  "be guessed from the number of channels (%d)\n",
174  st_index, dec_ctx->channels);
175  return AVERROR(EINVAL);
176  }
177 
178  av_get_channel_layout_string(buf, sizeof(buf), dec_ctx->channels, chl);
179  av_log(log_ctx, AV_LOG_WARNING,
180  "Channel layout is not set in output stream %d, "
181  "guessed channel layout is '%s'\n",
182  st_index, buf);
183  dec_ctx->channel_layout = chl;
184  return 0;
185 }
186 
187 static av_cold int movie_common_init(AVFilterContext *ctx, const char *args, const AVClass *class)
188 {
189  MovieContext *movie = ctx->priv;
191  int64_t timestamp;
192  int nb_streams, ret, i;
193  char default_streams[16], *stream_specs, *spec, *cursor;
194  char name[16];
195  AVStream *st;
196 
197  movie->class = class;
198  av_opt_set_defaults(movie);
199 
200  if (args) {
201  movie->file_name = av_get_token(&args, ":");
202  if (!movie->file_name)
203  return AVERROR(ENOMEM);
204  }
205  if (!args || !*movie->file_name) {
206  av_log(ctx, AV_LOG_ERROR, "No filename provided!\n");
207  return AVERROR(EINVAL);
208  }
209 
210  if (*args++ == ':' && (ret = av_set_options_string(movie, args, "=", ":")) < 0)
211  return ret;
212 
213  movie->seek_point = movie->seek_point_d * 1000000 + 0.5;
214 
215  stream_specs = movie->stream_specs;
216  if (!stream_specs) {
217  snprintf(default_streams, sizeof(default_streams), "d%c%d",
218  !strcmp(ctx->filter->name, "amovie") ? 'a' : 'v',
219  movie->stream_index);
220  stream_specs = default_streams;
221  }
222  for (cursor = stream_specs, nb_streams = 1; *cursor; cursor++)
223  if (*cursor == '+')
224  nb_streams++;
225 
226  if (movie->loop_count != 1 && nb_streams != 1) {
227  av_log(ctx, AV_LOG_ERROR,
228  "Loop with several streams is currently unsupported\n");
229  return AVERROR_PATCHWELCOME;
230  }
231 
232  av_register_all();
233 
234  // Try to find the movie format (container)
235  iformat = movie->format_name ? av_find_input_format(movie->format_name) : NULL;
236 
237  movie->format_ctx = NULL;
238  if ((ret = avformat_open_input(&movie->format_ctx, movie->file_name, iformat, NULL)) < 0) {
239  av_log(ctx, AV_LOG_ERROR,
240  "Failed to avformat_open_input '%s'\n", movie->file_name);
241  return ret;
242  }
243  if ((ret = avformat_find_stream_info(movie->format_ctx, NULL)) < 0)
244  av_log(ctx, AV_LOG_WARNING, "Failed to find stream info\n");
245 
246  // if seeking requested, we execute it
247  if (movie->seek_point > 0) {
248  timestamp = movie->seek_point;
249  // add the stream start time, should it exist
250  if (movie->format_ctx->start_time != AV_NOPTS_VALUE) {
251  if (timestamp > INT64_MAX - movie->format_ctx->start_time) {
252  av_log(ctx, AV_LOG_ERROR,
253  "%s: seek value overflow with start_time:%"PRId64" seek_point:%"PRId64"\n",
254  movie->file_name, movie->format_ctx->start_time, movie->seek_point);
255  return AVERROR(EINVAL);
256  }
257  timestamp += movie->format_ctx->start_time;
258  }
259  if ((ret = av_seek_frame(movie->format_ctx, -1, timestamp, AVSEEK_FLAG_BACKWARD)) < 0) {
260  av_log(ctx, AV_LOG_ERROR, "%s: could not seek to position %"PRId64"\n",
261  movie->file_name, timestamp);
262  return ret;
263  }
264  }
265 
266  for (i = 0; i < movie->format_ctx->nb_streams; i++)
267  movie->format_ctx->streams[i]->discard = AVDISCARD_ALL;
268 
269  movie->st = av_calloc(nb_streams, sizeof(*movie->st));
270  if (!movie->st)
271  return AVERROR(ENOMEM);
272 
273  for (i = 0; i < nb_streams; i++) {
274  spec = av_strtok(stream_specs, "+", &cursor);
275  if (!spec)
276  return AVERROR_BUG;
277  stream_specs = NULL; /* for next strtok */
278  st = find_stream(ctx, movie->format_ctx, spec);
279  if (!st)
280  return AVERROR(EINVAL);
282  movie->st[i].st = st;
283  movie->max_stream_index = FFMAX(movie->max_stream_index, st->index);
284  }
285  if (av_strtok(NULL, "+", &cursor))
286  return AVERROR_BUG;
287 
288  movie->out_index = av_calloc(movie->max_stream_index + 1,
289  sizeof(*movie->out_index));
290  if (!movie->out_index)
291  return AVERROR(ENOMEM);
292  for (i = 0; i <= movie->max_stream_index; i++)
293  movie->out_index[i] = -1;
294  for (i = 0; i < nb_streams; i++)
295  movie->out_index[movie->st[i].st->index] = i;
296 
297  for (i = 0; i < nb_streams; i++) {
298  AVFilterPad pad = { 0 };
299  snprintf(name, sizeof(name), "out%d", i);
300  pad.type = movie->st[i].st->codec->codec_type;
301  pad.name = av_strdup(name);
304  ff_insert_outpad(ctx, i, &pad);
305  ret = open_stream(ctx, &movie->st[i]);
306  if (ret < 0)
307  return ret;
308  if ( movie->st[i].st->codec->codec->type == AVMEDIA_TYPE_AUDIO &&
309  !movie->st[i].st->codec->channel_layout) {
310  ret = guess_channel_layout(&movie->st[i], i, ctx);
311  if (ret < 0)
312  return ret;
313  }
314  }
315 
316  if (!(movie->frame = avcodec_alloc_frame()) ) {
317  av_log(log, AV_LOG_ERROR, "Failed to alloc frame\n");
318  return AVERROR(ENOMEM);
319  }
320 
321  av_log(ctx, AV_LOG_VERBOSE, "seek_point:%"PRIi64" format_name:%s file_name:%s stream_index:%d\n",
322  movie->seek_point, movie->format_name, movie->file_name,
323  movie->stream_index);
324 
325  return 0;
326 }
327 
329 {
330  MovieContext *movie = ctx->priv;
331  int i;
332 
333  for (i = 0; i < ctx->nb_outputs; i++) {
334  av_freep(&ctx->output_pads[i].name);
335  if (movie->st[i].st)
336  avcodec_close(movie->st[i].st->codec);
337  }
338  av_opt_free(movie);
339  av_freep(&movie->file_name);
340  av_freep(&movie->st);
341  av_freep(&movie->out_index);
342  avcodec_free_frame(&movie->frame);
343  if (movie->format_ctx)
345 }
346 
348 {
349  MovieContext *movie = ctx->priv;
350  int list[] = { 0, -1 };
351  int64_t list64[] = { 0, -1 };
352  int i;
353 
354  for (i = 0; i < ctx->nb_outputs; i++) {
355  MovieStream *st = &movie->st[i];
356  AVCodecContext *c = st->st->codec;
357  AVFilterLink *outlink = ctx->outputs[i];
358 
359  switch (c->codec_type) {
360  case AVMEDIA_TYPE_VIDEO:
361  list[0] = c->pix_fmt;
363  break;
364  case AVMEDIA_TYPE_AUDIO:
365  list[0] = c->sample_fmt;
367  list[0] = c->sample_rate;
369  list64[0] = c->channel_layout;
371  &outlink->in_channel_layouts);
372  break;
373  }
374  }
375 
376  return 0;
377 }
378 
380 {
381  AVFilterContext *ctx = outlink->src;
382  MovieContext *movie = ctx->priv;
383  unsigned out_id = FF_OUTLINK_IDX(outlink);
384  MovieStream *st = &movie->st[out_id];
385  AVCodecContext *c = st->st->codec;
386 
387  outlink->time_base = st->st->time_base;
388 
389  switch (c->codec_type) {
390  case AVMEDIA_TYPE_VIDEO:
391  outlink->w = c->width;
392  outlink->h = c->height;
393  outlink->frame_rate = st->st->r_frame_rate;
394  break;
395  case AVMEDIA_TYPE_AUDIO:
396  break;
397  }
398 
399  return 0;
400 }
401 
403  AVFilterLink *outlink)
404 {
405  AVFilterBufferRef *buf, *copy;
406 
407  buf = avfilter_get_buffer_ref_from_frame(type, frame,
408  AV_PERM_WRITE |
411  if (!buf)
412  return NULL;
414  copy = ff_copy_buffer_ref(outlink, buf);
415  if (!copy)
416  return NULL;
417  buf->buf->data[0] = NULL; /* it belongs to the frame */
419  return copy;
420 }
421 
422 static char *describe_bufref_to_str(char *dst, size_t dst_size,
423  AVFilterBufferRef *buf,
424  AVFilterLink *link)
425 {
426  switch (buf->type) {
427  case AVMEDIA_TYPE_VIDEO:
428  snprintf(dst, dst_size,
429  "video pts:%s time:%s pos:%"PRId64" size:%dx%d aspect:%d/%d",
430  av_ts2str(buf->pts), av_ts2timestr(buf->pts, &link->time_base),
431  buf->pos, buf->video->w, buf->video->h,
434  break;
435  case AVMEDIA_TYPE_AUDIO:
436  snprintf(dst, dst_size,
437  "audio pts:%s time:%s pos:%"PRId64" samples:%d",
438  av_ts2str(buf->pts), av_ts2timestr(buf->pts, &link->time_base),
439  buf->pos, buf->audio->nb_samples);
440  break;
441  default:
442  snprintf(dst, dst_size, "%s BUG", av_get_media_type_string(buf->type));
443  break;
444  }
445  return dst;
446 }
447 
448 #define describe_bufref(buf, link) \
449  describe_bufref_to_str((char[1024]){0}, 1024, buf, link)
450 
451 static int rewind_file(AVFilterContext *ctx)
452 {
453  MovieContext *movie = ctx->priv;
454  int64_t timestamp = movie->seek_point;
455  int ret, i;
456 
457  if (movie->format_ctx->start_time != AV_NOPTS_VALUE)
458  timestamp += movie->format_ctx->start_time;
459  ret = av_seek_frame(movie->format_ctx, -1, timestamp, AVSEEK_FLAG_BACKWARD);
460  if (ret < 0) {
461  av_log(ctx, AV_LOG_ERROR, "Unable to loop: %s\n", av_err2str(ret));
462  movie->loop_count = 1; /* do not try again */
463  return ret;
464  }
465 
466  for (i = 0; i < ctx->nb_outputs; i++) {
467  avcodec_flush_buffers(movie->st[i].st->codec);
468  movie->st[i].done = 0;
469  }
470  movie->eof = 0;
471  return 0;
472 }
473 
474 /**
475  * Try to push a frame to the requested output.
476  *
477  * @param ctx filter context
478  * @param out_id number of output where a frame is wanted;
479  * if the frame is read from file, used to set the return value;
480  * if the codec is being flushed, flush the corresponding stream
481  * @return 1 if a frame was pushed on the requested output,
482  * 0 if another attempt is possible,
483  * <0 AVERROR code
484  */
485 static int movie_push_frame(AVFilterContext *ctx, unsigned out_id)
486 {
487  MovieContext *movie = ctx->priv;
488  AVPacket *pkt = &movie->pkt;
489  MovieStream *st;
490  int ret, got_frame = 0, pkt_out_id;
491  AVFilterLink *outlink;
492  AVFilterBufferRef *buf;
493 
494  if (!pkt->size) {
495  if (movie->eof) {
496  if (movie->st[out_id].done) {
497  if (movie->loop_count != 1) {
498  ret = rewind_file(ctx);
499  if (ret < 0)
500  return ret;
501  movie->loop_count -= movie->loop_count > 1;
502  av_log(ctx, AV_LOG_VERBOSE, "Stream finished, looping.\n");
503  return 0; /* retry */
504  }
505  return AVERROR_EOF;
506  }
507  pkt->stream_index = movie->st[out_id].st->index;
508  /* packet is already ready for flushing */
509  } else {
510  ret = av_read_frame(movie->format_ctx, &movie->pkt0);
511  if (ret < 0) {
512  av_init_packet(&movie->pkt0); /* ready for flushing */
513  *pkt = movie->pkt0;
514  if (ret == AVERROR_EOF) {
515  movie->eof = 1;
516  return 0; /* start flushing */
517  }
518  return ret;
519  }
520  *pkt = movie->pkt0;
521  }
522  }
523 
524  pkt_out_id = pkt->stream_index > movie->max_stream_index ? -1 :
525  movie->out_index[pkt->stream_index];
526  if (pkt_out_id < 0) {
527  av_free_packet(&movie->pkt0);
528  pkt->size = 0; /* ready for next run */
529  pkt->data = NULL;
530  return 0;
531  }
532  st = &movie->st[pkt_out_id];
533  outlink = ctx->outputs[pkt_out_id];
534 
535  switch (st->st->codec->codec_type) {
536  case AVMEDIA_TYPE_VIDEO:
537  ret = avcodec_decode_video2(st->st->codec, movie->frame, &got_frame, pkt);
538  break;
539  case AVMEDIA_TYPE_AUDIO:
540  ret = avcodec_decode_audio4(st->st->codec, movie->frame, &got_frame, pkt);
541  break;
542  default:
543  ret = AVERROR(ENOSYS);
544  break;
545  }
546  if (ret < 0) {
547  av_log(ctx, AV_LOG_WARNING, "Decode error: %s\n", av_err2str(ret));
548  return 0;
549  }
550  if (!ret)
551  ret = pkt->size;
552 
553  pkt->data += ret;
554  pkt->size -= ret;
555  if (pkt->size <= 0) {
556  av_free_packet(&movie->pkt0);
557  pkt->size = 0; /* ready for next run */
558  pkt->data = NULL;
559  }
560  if (!got_frame) {
561  if (!ret)
562  st->done = 1;
563  return 0;
564  }
565 
566  buf = frame_to_buf(st->st->codec->codec_type, movie->frame, outlink);
567  if (!buf)
568  return AVERROR(ENOMEM);
569  av_dlog(ctx, "movie_push_frame(): file:'%s' %s\n", movie->file_name,
570  describe_bufref(buf, outlink));
571  switch (st->st->codec->codec_type) {
572  case AVMEDIA_TYPE_VIDEO:
573  if (!movie->frame->sample_aspect_ratio.num)
575  /* Fall through */
576  case AVMEDIA_TYPE_AUDIO:
577  ff_filter_frame(outlink, buf);
578  break;
579  }
580 
581  return pkt_out_id == out_id;
582 }
583 
584 static int movie_request_frame(AVFilterLink *outlink)
585 {
586  AVFilterContext *ctx = outlink->src;
587  unsigned out_id = FF_OUTLINK_IDX(outlink);
588  int ret;
589 
590  while (1) {
591  ret = movie_push_frame(ctx, out_id);
592  if (ret)
593  return FFMIN(ret, 0);
594  }
595 }
596 
597 #if CONFIG_MOVIE_FILTER
598 
599 AVFILTER_DEFINE_CLASS(movie);
600 
601 static av_cold int movie_init(AVFilterContext *ctx, const char *args)
602 {
603  return movie_common_init(ctx, args, &movie_class);
604 }
605 
606 AVFilter avfilter_avsrc_movie = {
607  .name = "movie",
608  .description = NULL_IF_CONFIG_SMALL("Read from a movie source."),
609  .priv_size = sizeof(MovieContext),
610  .init = movie_init,
611  .uninit = movie_uninit,
613 
614  .inputs = NULL,
615  .outputs = NULL,
616  .priv_class = &movie_class,
617 };
618 
619 #endif /* CONFIG_MOVIE_FILTER */
620 
621 #if CONFIG_AMOVIE_FILTER
622 
623 #define amovie_options movie_options
624 AVFILTER_DEFINE_CLASS(amovie);
625 
626 static av_cold int amovie_init(AVFilterContext *ctx, const char *args)
627 {
628  return movie_common_init(ctx, args, &amovie_class);
629 }
630 
631 AVFilter avfilter_avsrc_amovie = {
632  .name = "amovie",
633  .description = NULL_IF_CONFIG_SMALL("Read audio from a movie source."),
634  .priv_size = sizeof(MovieContext),
635  .init = amovie_init,
636  .uninit = movie_uninit,
638 
639  .inputs = NULL,
640  .outputs = NULL,
641  .priv_class = &amovie_class,
642 };
643 
644 #endif /* CONFIG_AMOVIE_FILTER */