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avfilter.c
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1 /*
2  * filter layer
3  * Copyright (c) 2007 Bobby Bingham
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 #include "libavutil/avassert.h"
23 #include "libavutil/avstring.h"
25 #include "libavutil/common.h"
26 #include "libavutil/imgutils.h"
27 #include "libavutil/pixdesc.h"
28 #include "libavutil/rational.h"
29 #include "libavutil/samplefmt.h"
30 
31 #include "audio.h"
32 #include "avfilter.h"
33 #include "formats.h"
34 #include "internal.h"
35 #include "audio.h"
36 
38 
39 char *ff_get_ref_perms_string(char *buf, size_t buf_size, int perms)
40 {
41  snprintf(buf, buf_size, "%s%s%s%s%s%s",
42  perms & AV_PERM_READ ? "r" : "",
43  perms & AV_PERM_WRITE ? "w" : "",
44  perms & AV_PERM_PRESERVE ? "p" : "",
45  perms & AV_PERM_REUSE ? "u" : "",
46  perms & AV_PERM_REUSE2 ? "U" : "",
47  perms & AV_PERM_NEG_LINESIZES ? "n" : "");
48  return buf;
49 }
50 
51 void ff_tlog_ref(void *ctx, AVFilterBufferRef *ref, int end)
52 {
53  av_unused char buf[16];
54  ff_tlog(ctx,
55  "ref[%p buf:%p refcount:%d perms:%s data:%p linesize[%d, %d, %d, %d] pts:%"PRId64" pos:%"PRId64,
56  ref, ref->buf, ref->buf->refcount, ff_get_ref_perms_string(buf, sizeof(buf), ref->perms), ref->data[0],
57  ref->linesize[0], ref->linesize[1], ref->linesize[2], ref->linesize[3],
58  ref->pts, ref->pos);
59 
60  if (ref->video) {
61  ff_tlog(ctx, " a:%d/%d s:%dx%d i:%c iskey:%d type:%c",
63  ref->video->w, ref->video->h,
64  !ref->video->interlaced ? 'P' : /* Progressive */
65  ref->video->top_field_first ? 'T' : 'B', /* Top / Bottom */
66  ref->video->key_frame,
68  }
69  if (ref->audio) {
70  ff_tlog(ctx, " cl:%"PRId64"d n:%d r:%d",
71  ref->audio->channel_layout,
72  ref->audio->nb_samples,
73  ref->audio->sample_rate);
74  }
75 
76  ff_tlog(ctx, "]%s", end ? "\n" : "");
77 }
78 
79 unsigned avfilter_version(void) {
82 }
83 
84 const char *avfilter_configuration(void)
85 {
86  return FFMPEG_CONFIGURATION;
87 }
88 
89 const char *avfilter_license(void)
90 {
91 #define LICENSE_PREFIX "libavfilter license: "
92  return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
93 }
94 
96 {
98  av_freep(&c->arg);
99  av_freep(&c->command);
100  filter->command_queue= c->next;
101  av_free(c);
102 }
103 
104 void ff_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
105  AVFilterPad **pads, AVFilterLink ***links,
106  AVFilterPad *newpad)
107 {
108  unsigned i;
109 
110  idx = FFMIN(idx, *count);
111 
112  *pads = av_realloc(*pads, sizeof(AVFilterPad) * (*count + 1));
113  *links = av_realloc(*links, sizeof(AVFilterLink*) * (*count + 1));
114  memmove(*pads +idx+1, *pads +idx, sizeof(AVFilterPad) * (*count-idx));
115  memmove(*links+idx+1, *links+idx, sizeof(AVFilterLink*) * (*count-idx));
116  memcpy(*pads+idx, newpad, sizeof(AVFilterPad));
117  (*links)[idx] = NULL;
118 
119  (*count)++;
120  for (i = idx+1; i < *count; i++)
121  if (*links[i])
122  (*(unsigned *)((uint8_t *) *links[i] + padidx_off))++;
123 }
124 
125 int avfilter_link(AVFilterContext *src, unsigned srcpad,
126  AVFilterContext *dst, unsigned dstpad)
127 {
128  AVFilterLink *link;
129 
130  if (src->nb_outputs <= srcpad || dst->nb_inputs <= dstpad ||
131  src->outputs[srcpad] || dst->inputs[dstpad])
132  return -1;
133 
134  if (src->output_pads[srcpad].type != dst->input_pads[dstpad].type) {
135  av_log(src, AV_LOG_ERROR,
136  "Media type mismatch between the '%s' filter output pad %d (%s) and the '%s' filter input pad %d (%s)\n",
137  src->name, srcpad, (char *)av_x_if_null(av_get_media_type_string(src->output_pads[srcpad].type), "?"),
138  dst->name, dstpad, (char *)av_x_if_null(av_get_media_type_string(dst-> input_pads[dstpad].type), "?"));
139  return AVERROR(EINVAL);
140  }
141 
142  src->outputs[srcpad] =
143  dst-> inputs[dstpad] = link = av_mallocz(sizeof(AVFilterLink));
144 
145  link->src = src;
146  link->dst = dst;
147  link->srcpad = &src->output_pads[srcpad];
148  link->dstpad = &dst->input_pads[dstpad];
149  link->type = src->output_pads[srcpad].type;
151  link->format = -1;
152 
153  return 0;
154 }
155 
157 {
158  if (!*link)
159  return;
160 
161  if ((*link)->pool)
162  ff_free_pool((*link)->pool);
163 
164  avfilter_unref_bufferp(&(*link)->partial_buf);
165 
166  av_freep(link);
167 }
168 
170 {
171  return link->channels;
172 }
173 
174 void avfilter_link_set_closed(AVFilterLink *link, int closed)
175 {
176  link->closed = closed;
177 }
178 
180  unsigned filt_srcpad_idx, unsigned filt_dstpad_idx)
181 {
182  int ret;
183  unsigned dstpad_idx = link->dstpad - link->dst->input_pads;
184 
185  av_log(link->dst, AV_LOG_VERBOSE, "auto-inserting filter '%s' "
186  "between the filter '%s' and the filter '%s'\n",
187  filt->name, link->src->name, link->dst->name);
188 
189  link->dst->inputs[dstpad_idx] = NULL;
190  if ((ret = avfilter_link(filt, filt_dstpad_idx, link->dst, dstpad_idx)) < 0) {
191  /* failed to link output filter to new filter */
192  link->dst->inputs[dstpad_idx] = link;
193  return ret;
194  }
195 
196  /* re-hookup the link to the new destination filter we inserted */
197  link->dst = filt;
198  link->dstpad = &filt->input_pads[filt_srcpad_idx];
199  filt->inputs[filt_srcpad_idx] = link;
200 
201  /* if any information on supported media formats already exists on the
202  * link, we need to preserve that */
203  if (link->out_formats)
205  &filt->outputs[filt_dstpad_idx]->out_formats);
206 
207  if (link->out_samplerates)
209  &filt->outputs[filt_dstpad_idx]->out_samplerates);
210  if (link->out_channel_layouts)
212  &filt->outputs[filt_dstpad_idx]->out_channel_layouts);
213 
214  return 0;
215 }
216 
218 {
219  int (*config_link)(AVFilterLink *);
220  unsigned i;
221  int ret;
222 
223  for (i = 0; i < filter->nb_inputs; i ++) {
224  AVFilterLink *link = filter->inputs[i];
225  AVFilterLink *inlink;
226 
227  if (!link) continue;
228 
229  inlink = link->src->nb_inputs ? link->src->inputs[0] : NULL;
230  link->current_pts = AV_NOPTS_VALUE;
231 
232  switch (link->init_state) {
233  case AVLINK_INIT:
234  continue;
235  case AVLINK_STARTINIT:
236  av_log(filter, AV_LOG_INFO, "circular filter chain detected\n");
237  return 0;
238  case AVLINK_UNINIT:
239  link->init_state = AVLINK_STARTINIT;
240 
241  if ((ret = avfilter_config_links(link->src)) < 0)
242  return ret;
243 
244  if (!(config_link = link->srcpad->config_props)) {
245  if (link->src->nb_inputs != 1) {
246  av_log(link->src, AV_LOG_ERROR, "Source filters and filters "
247  "with more than one input "
248  "must set config_props() "
249  "callbacks on all outputs\n");
250  return AVERROR(EINVAL);
251  }
252  } else if ((ret = config_link(link)) < 0) {
253  av_log(link->src, AV_LOG_ERROR,
254  "Failed to configure output pad on %s\n",
255  link->src->name);
256  return ret;
257  }
258 
259  switch (link->type) {
260  case AVMEDIA_TYPE_VIDEO:
261  if (!link->time_base.num && !link->time_base.den)
262  link->time_base = inlink ? inlink->time_base : AV_TIME_BASE_Q;
263 
264  if (!link->sample_aspect_ratio.num && !link->sample_aspect_ratio.den)
265  link->sample_aspect_ratio = inlink ?
266  inlink->sample_aspect_ratio : (AVRational){1,1};
267 
268  if (inlink && !link->frame_rate.num && !link->frame_rate.den)
269  link->frame_rate = inlink->frame_rate;
270 
271  if (inlink) {
272  if (!link->w)
273  link->w = inlink->w;
274  if (!link->h)
275  link->h = inlink->h;
276  } else if (!link->w || !link->h) {
277  av_log(link->src, AV_LOG_ERROR,
278  "Video source filters must set their output link's "
279  "width and height\n");
280  return AVERROR(EINVAL);
281  }
282  break;
283 
284  case AVMEDIA_TYPE_AUDIO:
285  if (inlink) {
286  if (!link->time_base.num && !link->time_base.den)
287  link->time_base = inlink->time_base;
288  }
289 
290  if (!link->time_base.num && !link->time_base.den)
291  link->time_base = (AVRational) {1, link->sample_rate};
292  }
293 
294  if ((config_link = link->dstpad->config_props))
295  if ((ret = config_link(link)) < 0) {
296  av_log(link->src, AV_LOG_ERROR,
297  "Failed to configure input pad on %s\n",
298  link->dst->name);
299  return ret;
300  }
301 
302  link->init_state = AVLINK_INIT;
303  }
304  }
305 
306  return 0;
307 }
308 
309 void ff_tlog_link(void *ctx, AVFilterLink *link, int end)
310 {
311  if (link->type == AVMEDIA_TYPE_VIDEO) {
312  ff_tlog(ctx,
313  "link[%p s:%dx%d fmt:%s %s->%s]%s",
314  link, link->w, link->h,
316  link->src ? link->src->filter->name : "",
317  link->dst ? link->dst->filter->name : "",
318  end ? "\n" : "");
319  } else {
320  char buf[128];
321  av_get_channel_layout_string(buf, sizeof(buf), -1, link->channel_layout);
322 
323  ff_tlog(ctx,
324  "link[%p r:%d cl:%s fmt:%s %s->%s]%s",
325  link, (int)link->sample_rate, buf,
327  link->src ? link->src->filter->name : "",
328  link->dst ? link->dst->filter->name : "",
329  end ? "\n" : "");
330  }
331 }
332 
334 {
335  int ret = -1;
337 
338  if (link->closed)
339  return AVERROR_EOF;
340  if (link->srcpad->request_frame)
341  ret = link->srcpad->request_frame(link);
342  else if (link->src->inputs[0])
343  ret = ff_request_frame(link->src->inputs[0]);
344  if (ret == AVERROR_EOF && link->partial_buf) {
345  AVFilterBufferRef *pbuf = link->partial_buf;
346  link->partial_buf = NULL;
347  ff_filter_frame_framed(link, pbuf);
348  return 0;
349  }
350  if (ret == AVERROR_EOF)
351  link->closed = 1;
352  return ret;
353 }
354 
356 {
357  int i, min = INT_MAX;
358 
359  if (link->srcpad->poll_frame)
360  return link->srcpad->poll_frame(link);
361 
362  for (i = 0; i < link->src->nb_inputs; i++) {
363  int val;
364  if (!link->src->inputs[i])
365  return -1;
366  val = ff_poll_frame(link->src->inputs[i]);
367  min = FFMIN(min, val);
368  }
369 
370  return min;
371 }
372 
373 void ff_update_link_current_pts(AVFilterLink *link, int64_t pts)
374 {
375  if (pts == AV_NOPTS_VALUE)
376  return;
377  link->current_pts = av_rescale_q(pts, link->time_base, AV_TIME_BASE_Q);
378  /* TODO use duration */
379  if (link->graph && link->age_index >= 0)
381 }
382 
383 int avfilter_process_command(AVFilterContext *filter, const char *cmd, const char *arg, char *res, int res_len, int flags)
384 {
385  if(!strcmp(cmd, "ping")){
386  av_strlcatf(res, res_len, "pong from:%s %s\n", filter->filter->name, filter->name);
387  return 0;
388  }else if(filter->filter->process_command) {
389  return filter->filter->process_command(filter, cmd, arg, res, res_len, flags);
390  }
391  return AVERROR(ENOSYS);
392 }
393 
394 #define MAX_REGISTERED_AVFILTERS_NB 256
395 
397 
399 
401 {
402  int i;
403 
404  for (i = 0; registered_avfilters[i]; i++)
405  if (!strcmp(registered_avfilters[i]->name, name))
406  return registered_avfilters[i];
407 
408  return NULL;
409 }
410 
412 {
413  int i;
414 
417  "Maximum number of registered filters %d reached, "
418  "impossible to register filter with name '%s'\n",
420  return AVERROR(ENOMEM);
421  }
422 
423  for(i=0; filter->inputs && filter->inputs[i].name; i++) {
424  const AVFilterPad *input = &filter->inputs[i];
425  av_assert0( !input->filter_frame
426  || (!input->start_frame && !input->end_frame));
427  }
428 
429  registered_avfilters[next_registered_avfilter_idx++] = filter;
430  return 0;
431 }
432 
434 {
435  return filter ? ++filter : &registered_avfilters[0];
436 }
437 
438 void avfilter_uninit(void)
439 {
440  memset(registered_avfilters, 0, sizeof(registered_avfilters));
442 }
443 
444 static int pad_count(const AVFilterPad *pads)
445 {
446  int count;
447 
448  if (!pads)
449  return 0;
450 
451  for(count = 0; pads->name; count ++) pads ++;
452  return count;
453 }
454 
455 static const char *default_filter_name(void *filter_ctx)
456 {
457  AVFilterContext *ctx = filter_ctx;
458  return ctx->name ? ctx->name : ctx->filter->name;
459 }
460 
461 static void *filter_child_next(void *obj, void *prev)
462 {
463  AVFilterContext *ctx = obj;
464  if (!prev && ctx->filter && ctx->filter->priv_class)
465  return ctx->priv;
466  return NULL;
467 }
468 
469 static const AVClass *filter_child_class_next(const AVClass *prev)
470 {
471  AVFilter **filter_ptr = NULL;
472 
473  /* find the filter that corresponds to prev */
474  while (prev && *(filter_ptr = av_filter_next(filter_ptr)))
475  if ((*filter_ptr)->priv_class == prev)
476  break;
477 
478  /* could not find filter corresponding to prev */
479  if (prev && !(*filter_ptr))
480  return NULL;
481 
482  /* find next filter with specific options */
483  while (*(filter_ptr = av_filter_next(filter_ptr)))
484  if ((*filter_ptr)->priv_class)
485  return (*filter_ptr)->priv_class;
486  return NULL;
487 }
488 
489 static const AVClass avfilter_class = {
490  .class_name = "AVFilter",
491  .item_name = default_filter_name,
492  .version = LIBAVUTIL_VERSION_INT,
493  .category = AV_CLASS_CATEGORY_FILTER,
494  .child_next = filter_child_next,
495  .child_class_next = filter_child_class_next,
496 };
497 
499 {
500  return &avfilter_class;
501 }
502 
503 int avfilter_open(AVFilterContext **filter_ctx, AVFilter *filter, const char *inst_name)
504 {
505  AVFilterContext *ret;
506  *filter_ctx = NULL;
507 
508  if (!filter)
509  return AVERROR(EINVAL);
510 
511  ret = av_mallocz(sizeof(AVFilterContext));
512  if (!ret)
513  return AVERROR(ENOMEM);
514 
515  ret->av_class = &avfilter_class;
516  ret->filter = filter;
517  ret->name = inst_name ? av_strdup(inst_name) : NULL;
518  if (filter->priv_size) {
519  ret->priv = av_mallocz(filter->priv_size);
520  if (!ret->priv)
521  goto err;
522  }
523 
524  ret->nb_inputs = pad_count(filter->inputs);
525  if (ret->nb_inputs ) {
526  ret->input_pads = av_malloc(sizeof(AVFilterPad) * ret->nb_inputs);
527  if (!ret->input_pads)
528  goto err;
529  memcpy(ret->input_pads, filter->inputs, sizeof(AVFilterPad) * ret->nb_inputs);
530  ret->inputs = av_mallocz(sizeof(AVFilterLink*) * ret->nb_inputs);
531  if (!ret->inputs)
532  goto err;
533  }
534 
535  ret->nb_outputs = pad_count(filter->outputs);
536  if (ret->nb_outputs) {
537  ret->output_pads = av_malloc(sizeof(AVFilterPad) * ret->nb_outputs);
538  if (!ret->output_pads)
539  goto err;
540  memcpy(ret->output_pads, filter->outputs, sizeof(AVFilterPad) * ret->nb_outputs);
541  ret->outputs = av_mallocz(sizeof(AVFilterLink*) * ret->nb_outputs);
542  if (!ret->outputs)
543  goto err;
544  }
545 #if FF_API_FOO_COUNT
546  ret->output_count = ret->nb_outputs;
547  ret->input_count = ret->nb_inputs;
548 #endif
549 
550  *filter_ctx = ret;
551  return 0;
552 
553 err:
554  av_freep(&ret->inputs);
555  av_freep(&ret->input_pads);
556  ret->nb_inputs = 0;
557  av_freep(&ret->outputs);
558  av_freep(&ret->output_pads);
559  ret->nb_outputs = 0;
560  av_freep(&ret->priv);
561  av_free(ret);
562  return AVERROR(ENOMEM);
563 }
564 
566 {
567  int i;
568  AVFilterLink *link;
569 
570  if (!filter)
571  return;
572 
573  if (filter->filter->uninit)
574  filter->filter->uninit(filter);
575 
576  for (i = 0; i < filter->nb_inputs; i++) {
577  if ((link = filter->inputs[i])) {
578  if (link->src)
579  link->src->outputs[link->srcpad - link->src->output_pads] = NULL;
586  }
587  avfilter_link_free(&link);
588  }
589  for (i = 0; i < filter->nb_outputs; i++) {
590  if ((link = filter->outputs[i])) {
591  if (link->dst)
592  link->dst->inputs[link->dstpad - link->dst->input_pads] = NULL;
599  }
600  avfilter_link_free(&link);
601  }
602 
603  av_freep(&filter->name);
604  av_freep(&filter->input_pads);
605  av_freep(&filter->output_pads);
606  av_freep(&filter->inputs);
607  av_freep(&filter->outputs);
608  av_freep(&filter->priv);
609  while(filter->command_queue){
610  ff_command_queue_pop(filter);
611  }
612  av_free(filter);
613 }
614 
615 int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque)
616 {
617  int ret=0;
618 
619  if (filter->filter->init_opaque)
620  ret = filter->filter->init_opaque(filter, args, opaque);
621  else if (filter->filter->init)
622  ret = filter->filter->init(filter, args);
623  return ret;
624 }
625 
626 const char *avfilter_pad_get_name(AVFilterPad *pads, int pad_idx)
627 {
628  return pads[pad_idx].name;
629 }
630 
632 {
633  return pads[pad_idx].type;
634 }
635 
637 {
638  return ff_filter_frame(link->dst->outputs[0], frame);
639 }
640 
642 {
644  AVFilterPad *src = link->srcpad;
645  AVFilterPad *dst = link->dstpad;
647  int perms, ret;
648  AVFilterCommand *cmd= link->dst->command_queue;
649  int64_t pts;
650 
651  if (link->closed) {
652  avfilter_unref_buffer(frame);
653  return AVERROR_EOF;
654  }
655 
656  if (!(filter_frame = dst->filter_frame))
658 
659  av_assert1((frame->perms & src->min_perms) == src->min_perms);
660  frame->perms &= ~ src->rej_perms;
661  perms = frame->perms;
662 
663  if (frame->linesize[0] < 0)
664  perms |= AV_PERM_NEG_LINESIZES;
665 
666  /* prepare to copy the frame if the buffer has insufficient permissions */
667  if ((dst->min_perms & perms) != dst->min_perms ||
668  dst->rej_perms & perms) {
669  av_log(link->dst, AV_LOG_DEBUG,
670  "Copying data in avfilter (have perms %x, need %x, reject %x)\n",
671  perms, link->dstpad->min_perms, link->dstpad->rej_perms);
672 
673  /* Maybe use ff_copy_buffer_ref instead? */
674  switch (link->type) {
675  case AVMEDIA_TYPE_VIDEO:
676  out = ff_get_video_buffer(link, dst->min_perms,
677  link->w, link->h);
678  break;
679  case AVMEDIA_TYPE_AUDIO:
680  out = ff_get_audio_buffer(link, dst->min_perms,
681  frame->audio->nb_samples);
682  break;
683  default: return AVERROR(EINVAL);
684  }
685  if (!out) {
686  avfilter_unref_buffer(frame);
687  return AVERROR(ENOMEM);
688  }
689  avfilter_copy_buffer_ref_props(out, frame);
690 
691  switch (link->type) {
692  case AVMEDIA_TYPE_VIDEO:
693  av_image_copy(out->data, out->linesize, (const uint8_t **)frame->data, frame->linesize,
694  frame->format, frame->video->w, frame->video->h);
695  break;
696  case AVMEDIA_TYPE_AUDIO:
698  0, 0, frame->audio->nb_samples,
700  frame->format);
701  break;
702  default: return AVERROR(EINVAL);
703  }
704 
705  avfilter_unref_buffer(frame);
706  } else
707  out = frame;
708 
709  while(cmd && cmd->time <= out->pts * av_q2d(link->time_base)){
710  av_log(link->dst, AV_LOG_DEBUG,
711  "Processing command time:%f command:%s arg:%s\n",
712  cmd->time, cmd->command, cmd->arg);
713  avfilter_process_command(link->dst, cmd->command, cmd->arg, 0, 0, cmd->flags);
714  ff_command_queue_pop(link->dst);
715  cmd= link->dst->command_queue;
716  }
717 
718  pts = out->pts;
719  ret = filter_frame(link, out);
720  ff_update_link_current_pts(link, pts);
721  return ret;
722 }
723 
725 {
726  int insamples = frame->audio->nb_samples, inpos = 0, nb_samples;
727  AVFilterBufferRef *pbuf = link->partial_buf;
728  int nb_channels = frame->audio->channels;
729  int ret = 0;
730 
731  /* Handle framing (min_samples, max_samples) */
732  while (insamples) {
733  if (!pbuf) {
734  AVRational samples_tb = { 1, link->sample_rate };
735  int perms = link->dstpad->min_perms | AV_PERM_WRITE;
736  pbuf = ff_get_audio_buffer(link, perms, link->partial_buf_size);
737  if (!pbuf) {
738  av_log(link->dst, AV_LOG_WARNING,
739  "Samples dropped due to memory allocation failure.\n");
740  return 0;
741  }
742  avfilter_copy_buffer_ref_props(pbuf, frame);
743  pbuf->pts = frame->pts +
744  av_rescale_q(inpos, samples_tb, link->time_base);
745  pbuf->audio->nb_samples = 0;
746  }
747  nb_samples = FFMIN(insamples,
748  link->partial_buf_size - pbuf->audio->nb_samples);
750  pbuf->audio->nb_samples, inpos,
751  nb_samples, nb_channels, link->format);
752  inpos += nb_samples;
753  insamples -= nb_samples;
754  pbuf->audio->nb_samples += nb_samples;
755  if (pbuf->audio->nb_samples >= link->min_samples) {
756  ret = ff_filter_frame_framed(link, pbuf);
757  pbuf = NULL;
758  }
759  }
760  avfilter_unref_buffer(frame);
761  link->partial_buf = pbuf;
762  return ret;
763 }
764 
766 {
768 
769  /* Consistency checks */
770  if (link->type == AVMEDIA_TYPE_VIDEO) {
771  if (strcmp(link->dst->filter->name, "scale")) {
772  av_assert1(frame->format == link->format);
773  av_assert1(frame->video->w == link->w);
774  av_assert1(frame->video->h == link->h);
775  }
776  } else {
777  av_assert1(frame->format == link->format);
778  av_assert1(frame->audio->channels == link->channels);
779  av_assert1(frame->audio->channel_layout == link->channel_layout);
780  av_assert1(frame->audio->sample_rate == link->sample_rate);
781  }
782 
783  /* Go directly to actual filtering if possible */
784  if (link->type == AVMEDIA_TYPE_AUDIO &&
785  link->min_samples &&
786  (link->partial_buf ||
787  frame->audio->nb_samples < link->min_samples ||
788  frame->audio->nb_samples > link->max_samples)) {
789  return ff_filter_frame_needs_framing(link, frame);
790  } else {
791  return ff_filter_frame_framed(link, frame);
792  }
793 }