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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/atomic.h"
23 #include "libavutil/avassert.h"
24 #include "libavutil/avstring.h"
26 #include "libavutil/common.h"
27 #include "libavutil/eval.h"
28 #include "libavutil/imgutils.h"
29 #include "libavutil/internal.h"
30 #include "libavutil/opt.h"
31 #include "libavutil/pixdesc.h"
32 #include "libavutil/rational.h"
33 #include "libavutil/samplefmt.h"
34 
35 #include "audio.h"
36 #include "avfilter.h"
37 #include "formats.h"
38 #include "internal.h"
39 
41 
42 void ff_tlog_ref(void *ctx, AVFrame *ref, int end)
43 {
44  av_unused char buf[16];
45  ff_tlog(ctx,
46  "ref[%p buf:%p data:%p linesize[%d, %d, %d, %d] pts:%"PRId64" pos:%"PRId64,
47  ref, ref->buf, ref->data[0],
48  ref->linesize[0], ref->linesize[1], ref->linesize[2], ref->linesize[3],
49  ref->pts, av_frame_get_pkt_pos(ref));
50 
51  if (ref->width) {
52  ff_tlog(ctx, " a:%d/%d s:%dx%d i:%c iskey:%d type:%c",
54  ref->width, ref->height,
55  !ref->interlaced_frame ? 'P' : /* Progressive */
56  ref->top_field_first ? 'T' : 'B', /* Top / Bottom */
57  ref->key_frame,
59  }
60  if (ref->nb_samples) {
61  ff_tlog(ctx, " cl:%"PRId64"d n:%d r:%d",
62  ref->channel_layout,
63  ref->nb_samples,
64  ref->sample_rate);
65  }
66 
67  ff_tlog(ctx, "]%s", end ? "\n" : "");
68 }
69 
70 unsigned avfilter_version(void)
71 {
74 }
75 
76 const char *avfilter_configuration(void)
77 {
78  return FFMPEG_CONFIGURATION;
79 }
80 
81 const char *avfilter_license(void)
82 {
83 #define LICENSE_PREFIX "libavfilter license: "
84  return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
85 }
86 
88 {
90  av_freep(&c->arg);
91  av_freep(&c->command);
92  filter->command_queue= c->next;
93  av_free(c);
94 }
95 
96 int ff_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
97  AVFilterPad **pads, AVFilterLink ***links,
98  AVFilterPad *newpad)
99 {
100  AVFilterLink **newlinks;
101  AVFilterPad *newpads;
102  unsigned i;
103 
104  idx = FFMIN(idx, *count);
105 
106  newpads = av_realloc_array(*pads, *count + 1, sizeof(AVFilterPad));
107  newlinks = av_realloc_array(*links, *count + 1, sizeof(AVFilterLink*));
108  if (newpads)
109  *pads = newpads;
110  if (newlinks)
111  *links = newlinks;
112  if (!newpads || !newlinks)
113  return AVERROR(ENOMEM);
114 
115  memmove(*pads + idx + 1, *pads + idx, sizeof(AVFilterPad) * (*count - idx));
116  memmove(*links + idx + 1, *links + idx, sizeof(AVFilterLink*) * (*count - idx));
117  memcpy(*pads + idx, newpad, sizeof(AVFilterPad));
118  (*links)[idx] = NULL;
119 
120  (*count)++;
121  for (i = idx + 1; i < *count; i++)
122  if ((*links)[i])
123  (*(unsigned *)((uint8_t *) (*links)[i] + padidx_off))++;
124 
125  return 0;
126 }
127 
128 int avfilter_link(AVFilterContext *src, unsigned srcpad,
129  AVFilterContext *dst, unsigned dstpad)
130 {
131  AVFilterLink *link;
132 
133  if (src->nb_outputs <= srcpad || dst->nb_inputs <= dstpad ||
134  src->outputs[srcpad] || dst->inputs[dstpad])
135  return -1;
136 
137  if (src->output_pads[srcpad].type != dst->input_pads[dstpad].type) {
138  av_log(src, AV_LOG_ERROR,
139  "Media type mismatch between the '%s' filter output pad %d (%s) and the '%s' filter input pad %d (%s)\n",
140  src->name, srcpad, (char *)av_x_if_null(av_get_media_type_string(src->output_pads[srcpad].type), "?"),
141  dst->name, dstpad, (char *)av_x_if_null(av_get_media_type_string(dst-> input_pads[dstpad].type), "?"));
142  return AVERROR(EINVAL);
143  }
144 
145  link = av_mallocz(sizeof(*link));
146  if (!link)
147  return AVERROR(ENOMEM);
148 
149  src->outputs[srcpad] = dst->inputs[dstpad] = link;
150 
151  link->src = src;
152  link->dst = dst;
153  link->srcpad = &src->output_pads[srcpad];
154  link->dstpad = &dst->input_pads[dstpad];
155  link->type = src->output_pads[srcpad].type;
157  link->format = -1;
158 
159  return 0;
160 }
161 
163 {
164  if (!*link)
165  return;
166 
167  av_frame_free(&(*link)->partial_buf);
168 
169  av_freep(link);
170 }
171 
173 {
174  return link->channels;
175 }
176 
177 void avfilter_link_set_closed(AVFilterLink *link, int closed)
178 {
179  link->closed = closed;
180 }
181 
183  unsigned filt_srcpad_idx, unsigned filt_dstpad_idx)
184 {
185  int ret;
186  unsigned dstpad_idx = link->dstpad - link->dst->input_pads;
187 
188  av_log(link->dst, AV_LOG_VERBOSE, "auto-inserting filter '%s' "
189  "between the filter '%s' and the filter '%s'\n",
190  filt->name, link->src->name, link->dst->name);
191 
192  link->dst->inputs[dstpad_idx] = NULL;
193  if ((ret = avfilter_link(filt, filt_dstpad_idx, link->dst, dstpad_idx)) < 0) {
194  /* failed to link output filter to new filter */
195  link->dst->inputs[dstpad_idx] = link;
196  return ret;
197  }
198 
199  /* re-hookup the link to the new destination filter we inserted */
200  link->dst = filt;
201  link->dstpad = &filt->input_pads[filt_srcpad_idx];
202  filt->inputs[filt_srcpad_idx] = link;
203 
204  /* if any information on supported media formats already exists on the
205  * link, we need to preserve that */
206  if (link->out_formats)
208  &filt->outputs[filt_dstpad_idx]->out_formats);
209  if (link->out_samplerates)
211  &filt->outputs[filt_dstpad_idx]->out_samplerates);
212  if (link->out_channel_layouts)
214  &filt->outputs[filt_dstpad_idx]->out_channel_layouts);
215 
216  return 0;
217 }
218 
220 {
221  int (*config_link)(AVFilterLink *);
222  unsigned i;
223  int ret;
224 
225  for (i = 0; i < filter->nb_inputs; i ++) {
226  AVFilterLink *link = filter->inputs[i];
227  AVFilterLink *inlink;
228 
229  if (!link) continue;
230  if (!link->src || !link->dst) {
231  av_log(filter, AV_LOG_ERROR,
232  "Not all input and output are properly linked (%d).\n", i);
233  return AVERROR(EINVAL);
234  }
235 
236  inlink = link->src->nb_inputs ? link->src->inputs[0] : NULL;
237  link->current_pts = AV_NOPTS_VALUE;
238 
239  switch (link->init_state) {
240  case AVLINK_INIT:
241  continue;
242  case AVLINK_STARTINIT:
243  av_log(filter, AV_LOG_INFO, "circular filter chain detected\n");
244  return 0;
245  case AVLINK_UNINIT:
246  link->init_state = AVLINK_STARTINIT;
247 
248  if ((ret = avfilter_config_links(link->src)) < 0)
249  return ret;
250 
251  if (!(config_link = link->srcpad->config_props)) {
252  if (link->src->nb_inputs != 1) {
253  av_log(link->src, AV_LOG_ERROR, "Source filters and filters "
254  "with more than one input "
255  "must set config_props() "
256  "callbacks on all outputs\n");
257  return AVERROR(EINVAL);
258  }
259  } else if ((ret = config_link(link)) < 0) {
260  av_log(link->src, AV_LOG_ERROR,
261  "Failed to configure output pad on %s\n",
262  link->src->name);
263  return ret;
264  }
265 
266  switch (link->type) {
267  case AVMEDIA_TYPE_VIDEO:
268  if (!link->time_base.num && !link->time_base.den)
269  link->time_base = inlink ? inlink->time_base : AV_TIME_BASE_Q;
270 
271  if (!link->sample_aspect_ratio.num && !link->sample_aspect_ratio.den)
272  link->sample_aspect_ratio = inlink ?
273  inlink->sample_aspect_ratio : (AVRational){1,1};
274 
275  if (inlink && !link->frame_rate.num && !link->frame_rate.den)
276  link->frame_rate = inlink->frame_rate;
277 
278  if (inlink) {
279  if (!link->w)
280  link->w = inlink->w;
281  if (!link->h)
282  link->h = inlink->h;
283  } else if (!link->w || !link->h) {
284  av_log(link->src, AV_LOG_ERROR,
285  "Video source filters must set their output link's "
286  "width and height\n");
287  return AVERROR(EINVAL);
288  }
289  break;
290 
291  case AVMEDIA_TYPE_AUDIO:
292  if (inlink) {
293  if (!link->time_base.num && !link->time_base.den)
294  link->time_base = inlink->time_base;
295  }
296 
297  if (!link->time_base.num && !link->time_base.den)
298  link->time_base = (AVRational) {1, link->sample_rate};
299  }
300 
301  if ((config_link = link->dstpad->config_props))
302  if ((ret = config_link(link)) < 0) {
303  av_log(link->dst, AV_LOG_ERROR,
304  "Failed to configure input pad on %s\n",
305  link->dst->name);
306  return ret;
307  }
308 
309  link->init_state = AVLINK_INIT;
310  }
311  }
312 
313  return 0;
314 }
315 
316 void ff_tlog_link(void *ctx, AVFilterLink *link, int end)
317 {
318  if (link->type == AVMEDIA_TYPE_VIDEO) {
319  ff_tlog(ctx,
320  "link[%p s:%dx%d fmt:%s %s->%s]%s",
321  link, link->w, link->h,
323  link->src ? link->src->filter->name : "",
324  link->dst ? link->dst->filter->name : "",
325  end ? "\n" : "");
326  } else {
327  char buf[128];
328  av_get_channel_layout_string(buf, sizeof(buf), -1, link->channel_layout);
329 
330  ff_tlog(ctx,
331  "link[%p r:%d cl:%s fmt:%s %s->%s]%s",
332  link, (int)link->sample_rate, buf,
334  link->src ? link->src->filter->name : "",
335  link->dst ? link->dst->filter->name : "",
336  end ? "\n" : "");
337  }
338 }
339 
341 {
342  int ret = -1;
343  FF_TPRINTF_START(NULL, request_frame); ff_tlog_link(NULL, link, 1);
344 
345  if (link->closed)
346  return AVERROR_EOF;
347  av_assert0(!link->frame_requested);
348  link->frame_requested = 1;
349  while (link->frame_requested) {
350  if (link->srcpad->request_frame)
351  ret = link->srcpad->request_frame(link);
352  else if (link->src->inputs[0])
353  ret = ff_request_frame(link->src->inputs[0]);
354  if (ret == AVERROR_EOF && link->partial_buf) {
355  AVFrame *pbuf = link->partial_buf;
356  link->partial_buf = NULL;
357  ret = ff_filter_frame_framed(link, pbuf);
358  }
359  if (ret < 0) {
360  link->frame_requested = 0;
361  if (ret == AVERROR_EOF)
362  link->closed = 1;
363  } else {
364  av_assert0(!link->frame_requested ||
366  }
367  }
368  return ret;
369 }
370 
372 {
373  int i, min = INT_MAX;
374 
375  if (link->srcpad->poll_frame)
376  return link->srcpad->poll_frame(link);
377 
378  for (i = 0; i < link->src->nb_inputs; i++) {
379  int val;
380  if (!link->src->inputs[i])
381  return -1;
382  val = ff_poll_frame(link->src->inputs[i]);
383  min = FFMIN(min, val);
384  }
385 
386  return min;
387 }
388 
389 static const char *const var_names[] = {
390  "t",
391  "n",
392  "pos",
393  "w",
394  "h",
395  NULL
396 };
397 
398 enum {
405 };
406 
407 static int set_enable_expr(AVFilterContext *ctx, const char *expr)
408 {
409  int ret;
410  char *expr_dup;
411  AVExpr *old = ctx->enable;
412 
414  av_log(ctx, AV_LOG_ERROR, "Timeline ('enable' option) not supported "
415  "with filter '%s'\n", ctx->filter->name);
416  return AVERROR_PATCHWELCOME;
417  }
418 
419  expr_dup = av_strdup(expr);
420  if (!expr_dup)
421  return AVERROR(ENOMEM);
422 
423  if (!ctx->var_values) {
424  ctx->var_values = av_calloc(VAR_VARS_NB, sizeof(*ctx->var_values));
425  if (!ctx->var_values) {
426  av_free(expr_dup);
427  return AVERROR(ENOMEM);
428  }
429  }
430 
431  ret = av_expr_parse((AVExpr**)&ctx->enable, expr_dup, var_names,
432  NULL, NULL, NULL, NULL, 0, ctx->priv);
433  if (ret < 0) {
434  av_log(ctx->priv, AV_LOG_ERROR,
435  "Error when evaluating the expression '%s' for enable\n",
436  expr_dup);
437  av_free(expr_dup);
438  return ret;
439  }
440 
441  av_expr_free(old);
442  av_free(ctx->enable_str);
443  ctx->enable_str = expr_dup;
444  return 0;
445 }
446 
447 void ff_update_link_current_pts(AVFilterLink *link, int64_t pts)
448 {
449  if (pts == AV_NOPTS_VALUE)
450  return;
451  link->current_pts = av_rescale_q(pts, link->time_base, AV_TIME_BASE_Q);
452  /* TODO use duration */
453  if (link->graph && link->age_index >= 0)
455 }
456 
457 int avfilter_process_command(AVFilterContext *filter, const char *cmd, const char *arg, char *res, int res_len, int flags)
458 {
459  if(!strcmp(cmd, "ping")){
460  char local_res[256] = {0};
461 
462  if (!res) {
463  res = local_res;
464  res_len = sizeof(local_res);
465  }
466  av_strlcatf(res, res_len, "pong from:%s %s\n", filter->filter->name, filter->name);
467  if (res == local_res)
468  av_log(filter, AV_LOG_INFO, "%s", res);
469  return 0;
470  }else if(!strcmp(cmd, "enable")) {
471  return set_enable_expr(filter, arg);
472  }else if(filter->filter->process_command) {
473  return filter->filter->process_command(filter, cmd, arg, res, res_len, flags);
474  }
475  return AVERROR(ENOSYS);
476 }
477 
480 
481 #if !FF_API_NOCONST_GET_NAME
482 const
483 #endif
485 {
486  const AVFilter *f = NULL;
487 
488  if (!name)
489  return NULL;
490 
491  while ((f = avfilter_next(f)))
492  if (!strcmp(f->name, name))
493  return (AVFilter *)f;
494 
495  return NULL;
496 }
497 
499 {
500  AVFilter **f = last_filter;
501  int i;
502 
503  /* the filter must select generic or internal exclusively */
505 
506  for(i=0; filter->inputs && filter->inputs[i].name; i++) {
507  const AVFilterPad *input = &filter->inputs[i];
508  av_assert0( !input->filter_frame
509  || (!input->start_frame && !input->end_frame));
510  }
511 
512  filter->next = NULL;
513 
514  while(*f || avpriv_atomic_ptr_cas((void * volatile *)f, NULL, filter))
515  f = &(*f)->next;
516  last_filter = &filter->next;
517 
518  return 0;
519 }
520 
521 const AVFilter *avfilter_next(const AVFilter *prev)
522 {
523  return prev ? prev->next : first_filter;
524 }
525 
526 #if FF_API_OLD_FILTER_REGISTER
527 AVFilter **av_filter_next(AVFilter **filter)
528 {
529  return filter ? &(*filter)->next : &first_filter;
530 }
531 
532 void avfilter_uninit(void)
533 {
534 }
535 #endif
536 
538 {
539  int count;
540 
541  if (!pads)
542  return 0;
543 
544  for (count = 0; pads->name; count++)
545  pads++;
546  return count;
547 }
548 
549 static const char *default_filter_name(void *filter_ctx)
550 {
552  return ctx->name ? ctx->name : ctx->filter->name;
553 }
554 
555 static void *filter_child_next(void *obj, void *prev)
556 {
557  AVFilterContext *ctx = obj;
558  if (!prev && ctx->filter && ctx->filter->priv_class && ctx->priv)
559  return ctx->priv;
560  return NULL;
561 }
562 
563 static const AVClass *filter_child_class_next(const AVClass *prev)
564 {
565  const AVFilter *f = NULL;
566 
567  /* find the filter that corresponds to prev */
568  while (prev && (f = avfilter_next(f)))
569  if (f->priv_class == prev)
570  break;
571 
572  /* could not find filter corresponding to prev */
573  if (prev && !f)
574  return NULL;
575 
576  /* find next filter with specific options */
577  while ((f = avfilter_next(f)))
578  if (f->priv_class)
579  return f->priv_class;
580 
581  return NULL;
582 }
583 
584 #define OFFSET(x) offsetof(AVFilterContext, x)
585 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM
586 static const AVOption avfilter_options[] = {
587  { "thread_type", "Allowed thread types", OFFSET(thread_type), AV_OPT_TYPE_FLAGS,
588  { .i64 = AVFILTER_THREAD_SLICE }, 0, INT_MAX, FLAGS, "thread_type" },
589  { "slice", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AVFILTER_THREAD_SLICE }, .unit = "thread_type" },
590  { "enable", "set enable expression", OFFSET(enable_str), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
591  { NULL },
592 };
593 
594 static const AVClass avfilter_class = {
595  .class_name = "AVFilter",
596  .item_name = default_filter_name,
597  .version = LIBAVUTIL_VERSION_INT,
598  .category = AV_CLASS_CATEGORY_FILTER,
599  .child_next = filter_child_next,
600  .child_class_next = filter_child_class_next,
602 };
603 
605  int *ret, int nb_jobs)
606 {
607  int i;
608 
609  for (i = 0; i < nb_jobs; i++) {
610  int r = func(ctx, arg, i, nb_jobs);
611  if (ret)
612  ret[i] = r;
613  }
614  return 0;
615 }
616 
617 AVFilterContext *ff_filter_alloc(const AVFilter *filter, const char *inst_name)
618 {
620 
621  if (!filter)
622  return NULL;
623 
624  ret = av_mallocz(sizeof(AVFilterContext));
625  if (!ret)
626  return NULL;
627 
628  ret->av_class = &avfilter_class;
629  ret->filter = filter;
630  ret->name = inst_name ? av_strdup(inst_name) : NULL;
631  if (filter->priv_size) {
632  ret->priv = av_mallocz(filter->priv_size);
633  if (!ret->priv)
634  goto err;
635  }
636 
637  av_opt_set_defaults(ret);
638  if (filter->priv_class) {
639  *(const AVClass**)ret->priv = filter->priv_class;
641  }
642 
643  ret->internal = av_mallocz(sizeof(*ret->internal));
644  if (!ret->internal)
645  goto err;
647 
648  ret->nb_inputs = avfilter_pad_count(filter->inputs);
649  if (ret->nb_inputs ) {
650  ret->input_pads = av_malloc_array(ret->nb_inputs, sizeof(AVFilterPad));
651  if (!ret->input_pads)
652  goto err;
653  memcpy(ret->input_pads, filter->inputs, sizeof(AVFilterPad) * ret->nb_inputs);
654  ret->inputs = av_mallocz_array(ret->nb_inputs, sizeof(AVFilterLink*));
655  if (!ret->inputs)
656  goto err;
657  }
658 
659  ret->nb_outputs = avfilter_pad_count(filter->outputs);
660  if (ret->nb_outputs) {
661  ret->output_pads = av_malloc_array(ret->nb_outputs, sizeof(AVFilterPad));
662  if (!ret->output_pads)
663  goto err;
664  memcpy(ret->output_pads, filter->outputs, sizeof(AVFilterPad) * ret->nb_outputs);
665  ret->outputs = av_mallocz_array(ret->nb_outputs, sizeof(AVFilterLink*));
666  if (!ret->outputs)
667  goto err;
668  }
669 #if FF_API_FOO_COUNT
671  ret->output_count = ret->nb_outputs;
672  ret->input_count = ret->nb_inputs;
674 #endif
675 
676  return ret;
677 
678 err:
679  av_freep(&ret->inputs);
680  av_freep(&ret->input_pads);
681  ret->nb_inputs = 0;
682  av_freep(&ret->outputs);
683  av_freep(&ret->output_pads);
684  ret->nb_outputs = 0;
685  av_freep(&ret->priv);
686  av_freep(&ret->internal);
687  av_free(ret);
688  return NULL;
689 }
690 
691 #if FF_API_AVFILTER_OPEN
692 int avfilter_open(AVFilterContext **filter_ctx, AVFilter *filter, const char *inst_name)
693 {
694  *filter_ctx = ff_filter_alloc(filter, inst_name);
695  return *filter_ctx ? 0 : AVERROR(ENOMEM);
696 }
697 #endif
698 
699 static void free_link(AVFilterLink *link)
700 {
701  if (!link)
702  return;
703 
704  if (link->src)
705  link->src->outputs[link->srcpad - link->src->output_pads] = NULL;
706  if (link->dst)
707  link->dst->inputs[link->dstpad - link->dst->input_pads] = NULL;
708 
715  avfilter_link_free(&link);
716 }
717 
719 {
720  int i;
721 
722  if (!filter)
723  return;
724 
725  if (filter->graph)
726  ff_filter_graph_remove_filter(filter->graph, filter);
727 
728  if (filter->filter->uninit)
729  filter->filter->uninit(filter);
730 
731  for (i = 0; i < filter->nb_inputs; i++) {
732  free_link(filter->inputs[i]);
733  }
734  for (i = 0; i < filter->nb_outputs; i++) {
735  free_link(filter->outputs[i]);
736  }
737 
738  if (filter->filter->priv_class)
739  av_opt_free(filter->priv);
740 
741  av_freep(&filter->name);
742  av_freep(&filter->input_pads);
743  av_freep(&filter->output_pads);
744  av_freep(&filter->inputs);
745  av_freep(&filter->outputs);
746  av_freep(&filter->priv);
747  while(filter->command_queue){
748  ff_command_queue_pop(filter);
749  }
750  av_opt_free(filter);
751  av_expr_free(filter->enable);
752  filter->enable = NULL;
753  av_freep(&filter->var_values);
754  av_freep(&filter->internal);
755  av_free(filter);
756 }
757 
759  const char *args)
760 {
761  const AVOption *o = NULL;
762  int ret, count = 0;
763  char *av_uninit(parsed_key), *av_uninit(value);
764  const char *key;
765  int offset= -1;
766 
767  if (!args)
768  return 0;
769 
770  while (*args) {
771  const char *shorthand = NULL;
772 
773  o = av_opt_next(ctx->priv, o);
774  if (o) {
775  if (o->type == AV_OPT_TYPE_CONST || o->offset == offset)
776  continue;
777  offset = o->offset;
778  shorthand = o->name;
779  }
780 
781  ret = av_opt_get_key_value(&args, "=", ":",
782  shorthand ? AV_OPT_FLAG_IMPLICIT_KEY : 0,
783  &parsed_key, &value);
784  if (ret < 0) {
785  if (ret == AVERROR(EINVAL))
786  av_log(ctx, AV_LOG_ERROR, "No option name near '%s'\n", args);
787  else
788  av_log(ctx, AV_LOG_ERROR, "Unable to parse '%s': %s\n", args,
789  av_err2str(ret));
790  return ret;
791  }
792  if (*args)
793  args++;
794  if (parsed_key) {
795  key = parsed_key;
796  while ((o = av_opt_next(ctx->priv, o))); /* discard all remaining shorthand */
797  } else {
798  key = shorthand;
799  }
800 
801  av_log(ctx, AV_LOG_DEBUG, "Setting '%s' to value '%s'\n", key, value);
802 
803  if (av_opt_find(ctx, key, NULL, 0, 0)) {
804  ret = av_opt_set(ctx, key, value, 0);
805  if (ret < 0) {
806  av_free(value);
807  av_free(parsed_key);
808  return ret;
809  }
810  } else {
811  av_dict_set(options, key, value, 0);
812  if ((ret = av_opt_set(ctx->priv, key, value, 0)) < 0) {
813  if (!av_opt_find(ctx->priv, key, NULL, 0, AV_OPT_SEARCH_CHILDREN | AV_OPT_SEARCH_FAKE_OBJ)) {
814  if (ret == AVERROR_OPTION_NOT_FOUND)
815  av_log(ctx, AV_LOG_ERROR, "Option '%s' not found\n", key);
816  av_free(value);
817  av_free(parsed_key);
818  return ret;
819  }
820  }
821  }
822 
823  av_free(value);
824  av_free(parsed_key);
825  count++;
826  }
827 
828  if (ctx->enable_str) {
829  ret = set_enable_expr(ctx, ctx->enable_str);
830  if (ret < 0)
831  return ret;
832  }
833  return count;
834 }
835 
836 #if FF_API_AVFILTER_INIT_FILTER
837 int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque)
838 {
839  return avfilter_init_str(filter, args);
840 }
841 #endif
842 
844 {
845  int ret = 0;
846 
847  ret = av_opt_set_dict(ctx, options);
848  if (ret < 0) {
849  av_log(ctx, AV_LOG_ERROR, "Error applying generic filter options.\n");
850  return ret;
851  }
852 
855  ctx->graph->internal->thread_execute) {
858  } else {
859  ctx->thread_type = 0;
860  }
861 
862  if (ctx->filter->priv_class) {
863  ret = av_opt_set_dict(ctx->priv, options);
864  if (ret < 0) {
865  av_log(ctx, AV_LOG_ERROR, "Error applying options to the filter.\n");
866  return ret;
867  }
868  }
869 
870  if (ctx->filter->init_opaque)
871  ret = ctx->filter->init_opaque(ctx, NULL);
872  else if (ctx->filter->init)
873  ret = ctx->filter->init(ctx);
874  else if (ctx->filter->init_dict)
875  ret = ctx->filter->init_dict(ctx, options);
876 
877  return ret;
878 }
879 
881 {
882  AVDictionary *options = NULL;
884  int ret = 0;
885 
886  if (args && *args) {
887  if (!filter->filter->priv_class) {
888  av_log(filter, AV_LOG_ERROR, "This filter does not take any "
889  "options, but options were provided: %s.\n", args);
890  return AVERROR(EINVAL);
891  }
892 
893 #if FF_API_OLD_FILTER_OPTS
894  if ( !strcmp(filter->filter->name, "format") ||
895  !strcmp(filter->filter->name, "noformat") ||
896  !strcmp(filter->filter->name, "frei0r") ||
897  !strcmp(filter->filter->name, "frei0r_src") ||
898  !strcmp(filter->filter->name, "ocv") ||
899  !strcmp(filter->filter->name, "pan") ||
900  !strcmp(filter->filter->name, "pp") ||
901  !strcmp(filter->filter->name, "aevalsrc")) {
902  /* a hack for compatibility with the old syntax
903  * replace colons with |s */
904  char *copy = av_strdup(args);
905  char *p = copy;
906  int nb_leading = 0; // number of leading colons to skip
907  int deprecated = 0;
908 
909  if (!copy) {
910  ret = AVERROR(ENOMEM);
911  goto fail;
912  }
913 
914  if (!strcmp(filter->filter->name, "frei0r") ||
915  !strcmp(filter->filter->name, "ocv"))
916  nb_leading = 1;
917  else if (!strcmp(filter->filter->name, "frei0r_src"))
918  nb_leading = 3;
919 
920  while (nb_leading--) {
921  p = strchr(p, ':');
922  if (!p) {
923  p = copy + strlen(copy);
924  break;
925  }
926  p++;
927  }
928 
929  deprecated = strchr(p, ':') != NULL;
930 
931  if (!strcmp(filter->filter->name, "aevalsrc")) {
932  deprecated = 0;
933  while ((p = strchr(p, ':')) && p[1] != ':') {
934  const char *epos = strchr(p + 1, '=');
935  const char *spos = strchr(p + 1, ':');
936  const int next_token_is_opt = epos && (!spos || epos < spos);
937  if (next_token_is_opt) {
938  p++;
939  break;
940  }
941  /* next token does not contain a '=', assume a channel expression */
942  deprecated = 1;
943  *p++ = '|';
944  }
945  if (p && *p == ':') { // double sep '::' found
946  deprecated = 1;
947  memmove(p, p + 1, strlen(p));
948  }
949  } else
950  while ((p = strchr(p, ':')))
951  *p++ = '|';
952 
953  if (deprecated)
954  av_log(filter, AV_LOG_WARNING, "This syntax is deprecated. Use "
955  "'|' to separate the list items.\n");
956 
957  av_log(filter, AV_LOG_DEBUG, "compat: called with args=[%s]\n", copy);
958  ret = process_options(filter, &options, copy);
959  av_freep(&copy);
960 
961  if (ret < 0)
962  goto fail;
963 #endif
964  } else {
965 #if CONFIG_MP_FILTER
966  if (!strcmp(filter->filter->name, "mp")) {
967  char *escaped;
968 
969  if (!strncmp(args, "filter=", 7))
970  args += 7;
971  ret = av_escape(&escaped, args, ":=", AV_ESCAPE_MODE_BACKSLASH, 0);
972  if (ret < 0) {
973  av_log(filter, AV_LOG_ERROR, "Unable to escape MPlayer filters arg '%s'\n", args);
974  goto fail;
975  }
976  ret = process_options(filter, &options, escaped);
977  av_free(escaped);
978  } else
979 #endif
980  ret = process_options(filter, &options, args);
981  if (ret < 0)
982  goto fail;
983  }
984  }
985 
986  ret = avfilter_init_dict(filter, &options);
987  if (ret < 0)
988  goto fail;
989 
990  if ((e = av_dict_get(options, "", NULL, AV_DICT_IGNORE_SUFFIX))) {
991  av_log(filter, AV_LOG_ERROR, "No such option: %s.\n", e->key);
993  goto fail;
994  }
995 
996 fail:
997  av_dict_free(&options);
998 
999  return ret;
1000 }
1001 
1002 const char *avfilter_pad_get_name(const AVFilterPad *pads, int pad_idx)
1003 {
1004  return pads[pad_idx].name;
1005 }
1006 
1007 enum AVMediaType avfilter_pad_get_type(const AVFilterPad *pads, int pad_idx)
1008 {
1009  return pads[pad_idx].type;
1010 }
1011 
1013 {
1014  return ff_filter_frame(link->dst->outputs[0], frame);
1015 }
1016 
1018 {
1019  int (*filter_frame)(AVFilterLink *, AVFrame *);
1020  AVFilterContext *dstctx = link->dst;
1021  AVFilterPad *dst = link->dstpad;
1022  AVFrame *out = NULL;
1023  int ret;
1024  AVFilterCommand *cmd= link->dst->command_queue;
1025  int64_t pts;
1026 
1027  if (link->closed) {
1028  av_frame_free(&frame);
1029  return AVERROR_EOF;
1030  }
1031 
1032  if (!(filter_frame = dst->filter_frame))
1034 
1035  /* copy the frame if needed */
1036  if (dst->needs_writable && !av_frame_is_writable(frame)) {
1037  av_log(link->dst, AV_LOG_DEBUG, "Copying data in avfilter.\n");
1038 
1039  /* Maybe use ff_copy_buffer_ref instead? */
1040  switch (link->type) {
1041  case AVMEDIA_TYPE_VIDEO:
1042  out = ff_get_video_buffer(link, link->w, link->h);
1043  break;
1044  case AVMEDIA_TYPE_AUDIO:
1045  out = ff_get_audio_buffer(link, frame->nb_samples);
1046  break;
1047  default:
1048  ret = AVERROR(EINVAL);
1049  goto fail;
1050  }
1051  if (!out) {
1052  ret = AVERROR(ENOMEM);
1053  goto fail;
1054  }
1055 
1056  ret = av_frame_copy_props(out, frame);
1057  if (ret < 0)
1058  goto fail;
1059 
1060  switch (link->type) {
1061  case AVMEDIA_TYPE_VIDEO:
1062  av_image_copy(out->data, out->linesize, (const uint8_t **)frame->data, frame->linesize,
1063  frame->format, frame->width, frame->height);
1064  break;
1065  case AVMEDIA_TYPE_AUDIO:
1067  0, 0, frame->nb_samples,
1069  frame->format);
1070  break;
1071  default:
1072  ret = AVERROR(EINVAL);
1073  goto fail;
1074  }
1075 
1076  av_frame_free(&frame);
1077  } else
1078  out = frame;
1079 
1080  while(cmd && cmd->time <= out->pts * av_q2d(link->time_base)){
1081  av_log(link->dst, AV_LOG_DEBUG,
1082  "Processing command time:%f command:%s arg:%s\n",
1083  cmd->time, cmd->command, cmd->arg);
1084  avfilter_process_command(link->dst, cmd->command, cmd->arg, 0, 0, cmd->flags);
1085  ff_command_queue_pop(link->dst);
1086  cmd= link->dst->command_queue;
1087  }
1088 
1089  pts = out->pts;
1090  if (dstctx->enable_str) {
1091  int64_t pos = av_frame_get_pkt_pos(out);
1092  dstctx->var_values[VAR_N] = link->frame_count;
1093  dstctx->var_values[VAR_T] = pts == AV_NOPTS_VALUE ? NAN : pts * av_q2d(link->time_base);
1094  dstctx->var_values[VAR_W] = link->w;
1095  dstctx->var_values[VAR_H] = link->h;
1096  dstctx->var_values[VAR_POS] = pos == -1 ? NAN : pos;
1097 
1098  dstctx->is_disabled = fabs(av_expr_eval(dstctx->enable, dstctx->var_values, NULL)) < 0.5;
1099  if (dstctx->is_disabled &&
1102  }
1103  ret = filter_frame(link, out);
1104  link->frame_count++;
1105  link->frame_requested = 0;
1106  ff_update_link_current_pts(link, pts);
1107  return ret;
1108 
1109 fail:
1110  av_frame_free(&out);
1111  av_frame_free(&frame);
1112  return ret;
1113 }
1114 
1116 {
1117  int insamples = frame->nb_samples, inpos = 0, nb_samples;
1118  AVFrame *pbuf = link->partial_buf;
1119  int nb_channels = av_frame_get_channels(frame);
1120  int ret = 0;
1121 
1123  /* Handle framing (min_samples, max_samples) */
1124  while (insamples) {
1125  if (!pbuf) {
1126  AVRational samples_tb = { 1, link->sample_rate };
1127  pbuf = ff_get_audio_buffer(link, link->partial_buf_size);
1128  if (!pbuf) {
1129  av_log(link->dst, AV_LOG_WARNING,
1130  "Samples dropped due to memory allocation failure.\n");
1131  return 0;
1132  }
1133  av_frame_copy_props(pbuf, frame);
1134  pbuf->pts = frame->pts;
1135  if (pbuf->pts != AV_NOPTS_VALUE)
1136  pbuf->pts += av_rescale_q(inpos, samples_tb, link->time_base);
1137  pbuf->nb_samples = 0;
1138  }
1139  nb_samples = FFMIN(insamples,
1140  link->partial_buf_size - pbuf->nb_samples);
1142  pbuf->nb_samples, inpos,
1143  nb_samples, nb_channels, link->format);
1144  inpos += nb_samples;
1145  insamples -= nb_samples;
1146  pbuf->nb_samples += nb_samples;
1147  if (pbuf->nb_samples >= link->min_samples) {
1148  ret = ff_filter_frame_framed(link, pbuf);
1149  pbuf = NULL;
1150  }
1151  }
1152  av_frame_free(&frame);
1153  link->partial_buf = pbuf;
1154  return ret;
1155 }
1156 
1158 {
1159  FF_TPRINTF_START(NULL, filter_frame); ff_tlog_link(NULL, link, 1); ff_tlog(NULL, " "); ff_tlog_ref(NULL, frame, 1);
1160 
1161  /* Consistency checks */
1162  if (link->type == AVMEDIA_TYPE_VIDEO) {
1163  if (strcmp(link->dst->filter->name, "scale")) {
1164  av_assert1(frame->format == link->format);
1165  av_assert1(frame->width == link->w);
1166  av_assert1(frame->height == link->h);
1167  }
1168  } else {
1169  av_assert1(frame->format == link->format);
1170  av_assert1(av_frame_get_channels(frame) == link->channels);
1171  av_assert1(frame->channel_layout == link->channel_layout);
1172  av_assert1(frame->sample_rate == link->sample_rate);
1173  }
1174 
1175  /* Go directly to actual filtering if possible */
1176  if (link->type == AVMEDIA_TYPE_AUDIO &&
1177  link->min_samples &&
1178  (link->partial_buf ||
1179  frame->nb_samples < link->min_samples ||
1180  frame->nb_samples > link->max_samples)) {
1181  return ff_filter_frame_needs_framing(link, frame);
1182  } else {
1183  return ff_filter_frame_framed(link, frame);
1184  }
1185 }
1186 
1188 {
1189  return &avfilter_class;
1190 }