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buffersink.c
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1 /*
2  * Copyright (c) 2011 Stefano Sabatini
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 /**
22  * @file
23  * buffer sink
24  */
25 
26 #include "libavutil/audio_fifo.h"
27 #include "libavutil/avassert.h"
29 #include "libavutil/common.h"
30 #include "libavutil/internal.h"
31 #include "libavutil/mathematics.h"
32 #include "libavutil/opt.h"
33 
34 #include "audio.h"
35 #include "avfilter.h"
36 #include "buffersink.h"
37 #include "internal.h"
38 
39 typedef struct BufferSinkContext {
40  const AVClass *class;
41  AVFifoBuffer *fifo; ///< FIFO buffer of video frame references
42  unsigned warning_limit;
43 
44  /* only used for video */
45  enum AVPixelFormat *pixel_fmts; ///< list of accepted pixel formats, must be terminated with -1
47 
48  /* only used for audio */
49  enum AVSampleFormat *sample_fmts; ///< list of accepted sample formats, terminated by AV_SAMPLE_FMT_NONE
51  int64_t *channel_layouts; ///< list of accepted channel layouts, terminated by -1
53  int *channel_counts; ///< list of accepted channel counts, terminated by -1
56  int *sample_rates; ///< list of accepted sample rates, terminated by -1
58 
59  /* only used for compat API */
60  AVAudioFifo *audio_fifo; ///< FIFO for audio samples
61  int64_t next_pts; ///< interpolating audio pts
63 
64 #define NB_ITEMS(list) (list ## _size / sizeof(*list))
65 
66 static av_cold void uninit(AVFilterContext *ctx)
67 {
68  BufferSinkContext *sink = ctx->priv;
69  AVFrame *frame;
70 
71  if (sink->audio_fifo)
73 
74  if (sink->fifo) {
75  while (av_fifo_size(sink->fifo) >= sizeof(AVFilterBufferRef *)) {
76  av_fifo_generic_read(sink->fifo, &frame, sizeof(frame), NULL);
77  av_frame_free(&frame);
78  }
79  av_fifo_freep(&sink->fifo);
80  }
81 }
82 
83 static int add_buffer_ref(AVFilterContext *ctx, AVFrame *ref)
84 {
85  BufferSinkContext *buf = ctx->priv;
86 
87  if (av_fifo_space(buf->fifo) < sizeof(AVFilterBufferRef *)) {
88  /* realloc fifo size */
89  if (av_fifo_realloc2(buf->fifo, av_fifo_size(buf->fifo) * 2) < 0) {
90  av_log(ctx, AV_LOG_ERROR,
91  "Cannot buffer more frames. Consume some available frames "
92  "before adding new ones.\n");
93  return AVERROR(ENOMEM);
94  }
95  }
96 
97  /* cache frame */
98  av_fifo_generic_write(buf->fifo, &ref, sizeof(AVFilterBufferRef *), NULL);
99  return 0;
100 }
101 
103 {
104  AVFilterContext *ctx = link->dst;
105  BufferSinkContext *buf = link->dst->priv;
106  int ret;
107 
108  if ((ret = add_buffer_ref(ctx, frame)) < 0)
109  return ret;
110  if (buf->warning_limit &&
111  av_fifo_size(buf->fifo) / sizeof(AVFilterBufferRef *) >= buf->warning_limit) {
112  av_log(ctx, AV_LOG_WARNING,
113  "%d buffers queued in %s, something may be wrong.\n",
114  buf->warning_limit,
115  (char *)av_x_if_null(ctx->name, ctx->filter->name));
116  buf->warning_limit *= 10;
117  }
118  return 0;
119 }
120 
121 int attribute_align_arg av_buffersink_get_frame(AVFilterContext *ctx, AVFrame *frame)
122 {
123  return av_buffersink_get_frame_flags(ctx, frame, 0);
124 }
125 
127 {
128  BufferSinkContext *buf = ctx->priv;
129  AVFilterLink *inlink = ctx->inputs[0];
130  int ret;
131  AVFrame *cur_frame;
132 
133  /* no picref available, fetch it from the filterchain */
134  if (!av_fifo_size(buf->fifo)) {
135  if (flags & AV_BUFFERSINK_FLAG_NO_REQUEST)
136  return AVERROR(EAGAIN);
137  if ((ret = ff_request_frame(inlink)) < 0)
138  return ret;
139  }
140 
141  if (!av_fifo_size(buf->fifo))
142  return AVERROR(EINVAL);
143 
144  if (flags & AV_BUFFERSINK_FLAG_PEEK) {
145  cur_frame = *((AVFrame **)av_fifo_peek2(buf->fifo, 0));
146  if ((ret = av_frame_ref(frame, cur_frame)) < 0)
147  return ret;
148  } else {
149  av_fifo_generic_read(buf->fifo, &cur_frame, sizeof(cur_frame), NULL);
150  av_frame_move_ref(frame, cur_frame);
151  av_frame_free(&cur_frame);
152  }
153 
154  return 0;
155 }
156 
158  int nb_samples)
159 {
160  BufferSinkContext *s = ctx->priv;
161  AVFilterLink *link = ctx->inputs[0];
162  AVFrame *tmp;
163 
164  if (!(tmp = ff_get_audio_buffer(link, nb_samples)))
165  return AVERROR(ENOMEM);
166  av_audio_fifo_read(s->audio_fifo, (void**)tmp->extended_data, nb_samples);
167 
168  tmp->pts = s->next_pts;
169  if (s->next_pts != AV_NOPTS_VALUE)
170  s->next_pts += av_rescale_q(nb_samples, (AVRational){1, link->sample_rate},
171  link->time_base);
172 
173  av_frame_move_ref(frame, tmp);
174  av_frame_free(&tmp);
175 
176  return 0;
177 }
178 
179 int attribute_align_arg av_buffersink_get_samples(AVFilterContext *ctx,
180  AVFrame *frame, int nb_samples)
181 {
182  BufferSinkContext *s = ctx->priv;
183  AVFilterLink *link = ctx->inputs[0];
184  AVFrame *cur_frame;
185  int ret = 0;
186 
187  if (!s->audio_fifo) {
188  int nb_channels = link->channels;
189  if (!(s->audio_fifo = av_audio_fifo_alloc(link->format, nb_channels, nb_samples)))
190  return AVERROR(ENOMEM);
191  }
192 
193  while (ret >= 0) {
194  if (av_audio_fifo_size(s->audio_fifo) >= nb_samples)
195  return read_from_fifo(ctx, frame, nb_samples);
196 
197  if (!(cur_frame = av_frame_alloc()))
198  return AVERROR(ENOMEM);
199  ret = av_buffersink_get_frame_flags(ctx, cur_frame, 0);
200  if (ret == AVERROR_EOF && av_audio_fifo_size(s->audio_fifo)) {
201  av_frame_free(&cur_frame);
202  return read_from_fifo(ctx, frame, av_audio_fifo_size(s->audio_fifo));
203  } else if (ret < 0) {
204  av_frame_free(&cur_frame);
205  return ret;
206  }
207 
208  if (cur_frame->pts != AV_NOPTS_VALUE) {
209  s->next_pts = cur_frame->pts -
211  (AVRational){ 1, link->sample_rate },
212  link->time_base);
213  }
214 
215  ret = av_audio_fifo_write(s->audio_fifo, (void**)cur_frame->extended_data,
216  cur_frame->nb_samples);
217  av_frame_free(&cur_frame);
218  }
219 
220  return ret;
221 }
222 
224 {
225  static const int pixel_fmts[] = { AV_PIX_FMT_NONE };
227  if (!params)
228  return NULL;
229 
230  params->pixel_fmts = pixel_fmts;
231  return params;
232 }
233 
235 {
237 
238  if (!params)
239  return NULL;
240  return params;
241 }
242 
243 #define FIFO_INIT_SIZE 8
244 
246 {
247  BufferSinkContext *buf = ctx->priv;
248 
249  buf->fifo = av_fifo_alloc_array(FIFO_INIT_SIZE, sizeof(AVFilterBufferRef *));
250  if (!buf->fifo) {
251  av_log(ctx, AV_LOG_ERROR, "Failed to allocate fifo\n");
252  return AVERROR(ENOMEM);
253  }
254  buf->warning_limit = 100;
255  buf->next_pts = AV_NOPTS_VALUE;
256  return 0;
257 }
258 
260 {
261  AVFilterLink *inlink = ctx->inputs[0];
262 
263  inlink->min_samples = inlink->max_samples =
264  inlink->partial_buf_size = frame_size;
265 }
266 
267 #if FF_API_AVFILTERBUFFER
269 static void compat_free_buffer(AVFilterBuffer *buf)
270 {
271  AVFrame *frame = buf->priv;
272  av_frame_free(&frame);
273  av_free(buf);
274 }
275 
276 static int compat_read(AVFilterContext *ctx,
277  AVFilterBufferRef **pbuf, int nb_samples, int flags)
278 {
279  AVFilterBufferRef *buf;
280  AVFrame *frame;
281  int ret;
282 
283  if (!pbuf)
284  return ff_poll_frame(ctx->inputs[0]);
285 
286  frame = av_frame_alloc();
287  if (!frame)
288  return AVERROR(ENOMEM);
289 
290  if (!nb_samples)
291  ret = av_buffersink_get_frame_flags(ctx, frame, flags);
292  else
293  ret = av_buffersink_get_samples(ctx, frame, nb_samples);
294 
295  if (ret < 0)
296  goto fail;
297 
299  if (ctx->inputs[0]->type == AVMEDIA_TYPE_VIDEO) {
301  AV_PERM_READ,
302  frame->width, frame->height,
303  frame->format);
304  } else {
305  buf = avfilter_get_audio_buffer_ref_from_arrays(frame->extended_data,
306  frame->linesize[0], AV_PERM_READ,
307  frame->nb_samples,
308  frame->format,
309  frame->channel_layout);
310  }
311  if (!buf) {
312  ret = AVERROR(ENOMEM);
313  goto fail;
314  }
315 
316  avfilter_copy_frame_props(buf, frame);
317  )
318 
319  buf->buf->priv = frame;
320  buf->buf->free = compat_free_buffer;
321 
322  *pbuf = buf;
323 
324  return 0;
325 fail:
326  av_frame_free(&frame);
327  return ret;
328 }
329 
330 int attribute_align_arg av_buffersink_read(AVFilterContext *ctx, AVFilterBufferRef **buf)
331 {
332  return compat_read(ctx, buf, 0, 0);
333 }
334 
335 int attribute_align_arg av_buffersink_read_samples(AVFilterContext *ctx, AVFilterBufferRef **buf,
336  int nb_samples)
337 {
338  return compat_read(ctx, buf, nb_samples, 0);
339 }
340 
341 int attribute_align_arg av_buffersink_get_buffer_ref(AVFilterContext *ctx,
342  AVFilterBufferRef **bufref, int flags)
343 {
344  *bufref = NULL;
345 
346  av_assert0( !strcmp(ctx->filter->name, "buffersink")
347  || !strcmp(ctx->filter->name, "abuffersink")
348  || !strcmp(ctx->filter->name, "ffbuffersink")
349  || !strcmp(ctx->filter->name, "ffabuffersink"));
350 
351  return compat_read(ctx, bufref, 0, flags);
352 }
354 #endif
355 
357 {
358  av_assert0( !strcmp(ctx->filter->name, "buffersink")
359  || !strcmp(ctx->filter->name, "ffbuffersink"));
360 
361  return ctx->inputs[0]->frame_rate;
362 }
363 
364 int attribute_align_arg av_buffersink_poll_frame(AVFilterContext *ctx)
365 {
366  BufferSinkContext *buf = ctx->priv;
367  AVFilterLink *inlink = ctx->inputs[0];
368 
369  av_assert0( !strcmp(ctx->filter->name, "buffersink")
370  || !strcmp(ctx->filter->name, "abuffersink")
371  || !strcmp(ctx->filter->name, "ffbuffersink")
372  || !strcmp(ctx->filter->name, "ffabuffersink"));
373 
374  return av_fifo_size(buf->fifo)/sizeof(AVFilterBufferRef *) + ff_poll_frame(inlink);
375 }
376 
377 static av_cold int vsink_init(AVFilterContext *ctx, void *opaque)
378 {
379  BufferSinkContext *buf = ctx->priv;
380  AVBufferSinkParams *params = opaque;
381  int ret;
382 
383  if (params) {
384  if ((ret = av_opt_set_int_list(buf, "pix_fmts", params->pixel_fmts, AV_PIX_FMT_NONE, 0)) < 0)
385  return ret;
386  }
387 
388  return common_init(ctx);
389 }
390 
391 #define CHECK_LIST_SIZE(field) \
392  if (buf->field ## _size % sizeof(*buf->field)) { \
393  av_log(ctx, AV_LOG_ERROR, "Invalid size for " #field ": %d, " \
394  "should be multiple of %d\n", \
395  buf->field ## _size, (int)sizeof(*buf->field)); \
396  return AVERROR(EINVAL); \
397  }
399 {
400  BufferSinkContext *buf = ctx->priv;
402  unsigned i;
403  int ret;
404 
405  CHECK_LIST_SIZE(pixel_fmts)
406  if (buf->pixel_fmts_size) {
407  for (i = 0; i < NB_ITEMS(buf->pixel_fmts); i++)
408  if ((ret = ff_add_format(&formats, buf->pixel_fmts[i])) < 0) {
409  ff_formats_unref(&formats);
410  return ret;
411  }
412  ff_set_common_formats(ctx, formats);
413  } else {
415  }
416 
417  return 0;
418 }
419 
420 static av_cold int asink_init(AVFilterContext *ctx, void *opaque)
421 {
422  BufferSinkContext *buf = ctx->priv;
423  AVABufferSinkParams *params = opaque;
424  int ret;
425 
426  if (params) {
427  if ((ret = av_opt_set_int_list(buf, "sample_fmts", params->sample_fmts, AV_SAMPLE_FMT_NONE, 0)) < 0 ||
428  (ret = av_opt_set_int_list(buf, "sample_rates", params->sample_rates, -1, 0)) < 0 ||
429  (ret = av_opt_set_int_list(buf, "channel_layouts", params->channel_layouts, -1, 0)) < 0 ||
430  (ret = av_opt_set_int_list(buf, "channel_counts", params->channel_counts, -1, 0)) < 0 ||
431  (ret = av_opt_set_int(buf, "all_channel_counts", params->all_channel_counts, 0)) < 0)
432  return ret;
433  }
434  return common_init(ctx);
435 }
436 
438 {
439  BufferSinkContext *buf = ctx->priv;
442  unsigned i;
443  int ret;
444 
447  CHECK_LIST_SIZE(channel_layouts)
448  CHECK_LIST_SIZE(channel_counts)
449 
450  if (buf->sample_fmts_size) {
451  for (i = 0; i < NB_ITEMS(buf->sample_fmts); i++)
452  if ((ret = ff_add_format(&formats, buf->sample_fmts[i])) < 0) {
453  ff_formats_unref(&formats);
454  return ret;
455  }
456  ff_set_common_formats(ctx, formats);
457  }
458 
459  if (buf->channel_layouts_size || buf->channel_counts_size ||
460  buf->all_channel_counts) {
461  for (i = 0; i < NB_ITEMS(buf->channel_layouts); i++)
462  if ((ret = ff_add_channel_layout(&layouts, buf->channel_layouts[i])) < 0) {
463  ff_channel_layouts_unref(&layouts);
464  return ret;
465  }
466  for (i = 0; i < NB_ITEMS(buf->channel_counts); i++)
467  if ((ret = ff_add_channel_layout(&layouts, FF_COUNT2LAYOUT(buf->channel_counts[i]))) < 0) {
468  ff_channel_layouts_unref(&layouts);
469  return ret;
470  }
471  if (buf->all_channel_counts) {
472  if (layouts)
473  av_log(ctx, AV_LOG_WARNING,
474  "Conflicting all_channel_counts and list in options\n");
475  else if (!(layouts = ff_all_channel_counts()))
476  return AVERROR(ENOMEM);
477  }
478  ff_set_common_channel_layouts(ctx, layouts);
479  }
480 
481  if (buf->sample_rates_size) {
482  formats = NULL;
483  for (i = 0; i < NB_ITEMS(buf->sample_rates); i++)
484  if ((ret = ff_add_format(&formats, buf->sample_rates[i])) < 0) {
485  ff_formats_unref(&formats);
486  return ret;
487  }
488  ff_set_common_samplerates(ctx, formats);
489  }
490 
491  return 0;
492 }
493 
494 #define OFFSET(x) offsetof(BufferSinkContext, x)
495 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
496 static const AVOption buffersink_options[] = {
497  { "pix_fmts", "set the supported pixel formats", OFFSET(pixel_fmts), AV_OPT_TYPE_BINARY, .flags = FLAGS },
498  { NULL },
499 };
500 #undef FLAGS
501 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
502 static const AVOption abuffersink_options[] = {
503  { "sample_fmts", "set the supported sample formats", OFFSET(sample_fmts), AV_OPT_TYPE_BINARY, .flags = FLAGS },
504  { "sample_rates", "set the supported sample rates", OFFSET(sample_rates), AV_OPT_TYPE_BINARY, .flags = FLAGS },
505  { "channel_layouts", "set the supported channel layouts", OFFSET(channel_layouts), AV_OPT_TYPE_BINARY, .flags = FLAGS },
506  { "channel_counts", "set the supported channel counts", OFFSET(channel_counts), AV_OPT_TYPE_BINARY, .flags = FLAGS },
507  { "all_channel_counts", "accept all channel counts", OFFSET(all_channel_counts), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, FLAGS },
508  { NULL },
509 };
510 #undef FLAGS
511 
512 AVFILTER_DEFINE_CLASS(buffersink);
513 AVFILTER_DEFINE_CLASS(abuffersink);
514 
515 #if FF_API_AVFILTERBUFFER
516 
517 #define ffbuffersink_options buffersink_options
518 #define ffabuffersink_options abuffersink_options
519 AVFILTER_DEFINE_CLASS(ffbuffersink);
520 AVFILTER_DEFINE_CLASS(ffabuffersink);
521 
522 static const AVFilterPad ffbuffersink_inputs[] = {
523  {
524  .name = "default",
525  .type = AVMEDIA_TYPE_VIDEO,
526  .filter_frame = filter_frame,
527  },
528  { NULL },
529 };
530 
531 AVFilter ff_vsink_ffbuffersink = {
532  .name = "ffbuffersink",
533  .description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them available to the end of the filter graph."),
534  .priv_size = sizeof(BufferSinkContext),
535  .priv_class = &ffbuffersink_class,
536  .init_opaque = vsink_init,
537  .uninit = uninit,
538 
540  .inputs = ffbuffersink_inputs,
541  .outputs = NULL,
542 };
543 
544 static const AVFilterPad ffabuffersink_inputs[] = {
545  {
546  .name = "default",
547  .type = AVMEDIA_TYPE_AUDIO,
548  .filter_frame = filter_frame,
549  },
550  { NULL },
551 };
552 
553 AVFilter ff_asink_ffabuffersink = {
554  .name = "ffabuffersink",
555  .description = NULL_IF_CONFIG_SMALL("Buffer audio frames, and make them available to the end of the filter graph."),
556  .init_opaque = asink_init,
557  .uninit = uninit,
558  .priv_size = sizeof(BufferSinkContext),
559  .priv_class = &ffabuffersink_class,
561  .inputs = ffabuffersink_inputs,
562  .outputs = NULL,
563 };
564 #endif /* FF_API_AVFILTERBUFFER */
565 
567  {
568  .name = "default",
569  .type = AVMEDIA_TYPE_VIDEO,
570  .filter_frame = filter_frame,
571  },
572  { NULL }
573 };
574 
576  .name = "buffersink",
577  .description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them available to the end of the filter graph."),
578  .priv_size = sizeof(BufferSinkContext),
579  .priv_class = &buffersink_class,
580  .init_opaque = vsink_init,
581  .uninit = uninit,
582 
584  .inputs = avfilter_vsink_buffer_inputs,
585  .outputs = NULL,
586 };
587 
589  {
590  .name = "default",
591  .type = AVMEDIA_TYPE_AUDIO,
592  .filter_frame = filter_frame,
593  },
594  { NULL }
595 };
596 
598  .name = "abuffersink",
599  .description = NULL_IF_CONFIG_SMALL("Buffer audio frames, and make them available to the end of the filter graph."),
600  .priv_class = &abuffersink_class,
601  .priv_size = sizeof(BufferSinkContext),
602  .init_opaque = asink_init,
603  .uninit = uninit,
604 
606  .inputs = avfilter_asink_abuffer_inputs,
607  .outputs = NULL,
608 };