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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 
40 #include "libavutil/ffversion.h"
41 const char av_filter_ffversion[] = "FFmpeg version " FFMPEG_VERSION;
42 
44 
45 void ff_tlog_ref(void *ctx, AVFrame *ref, int end)
46 {
47  av_unused char buf[16];
48  ff_tlog(ctx,
49  "ref[%p buf:%p data:%p linesize[%d, %d, %d, %d] pts:%"PRId64" pos:%"PRId64,
50  ref, ref->buf, ref->data[0],
51  ref->linesize[0], ref->linesize[1], ref->linesize[2], ref->linesize[3],
52  ref->pts, av_frame_get_pkt_pos(ref));
53 
54  if (ref->width) {
55  ff_tlog(ctx, " a:%d/%d s:%dx%d i:%c iskey:%d type:%c",
57  ref->width, ref->height,
58  !ref->interlaced_frame ? 'P' : /* Progressive */
59  ref->top_field_first ? 'T' : 'B', /* Top / Bottom */
60  ref->key_frame,
62  }
63  if (ref->nb_samples) {
64  ff_tlog(ctx, " cl:%"PRId64"d n:%d r:%d",
65  ref->channel_layout,
66  ref->nb_samples,
67  ref->sample_rate);
68  }
69 
70  ff_tlog(ctx, "]%s", end ? "\n" : "");
71 }
72 
73 unsigned avfilter_version(void)
74 {
77 }
78 
79 const char *avfilter_configuration(void)
80 {
81  return FFMPEG_CONFIGURATION;
82 }
83 
84 const char *avfilter_license(void)
85 {
86 #define LICENSE_PREFIX "libavfilter license: "
87  return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
88 }
89 
91 {
93  av_freep(&c->arg);
94  av_freep(&c->command);
95  filter->command_queue= c->next;
96  av_free(c);
97 }
98 
99 int ff_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
100  AVFilterPad **pads, AVFilterLink ***links,
101  AVFilterPad *newpad)
102 {
103  AVFilterLink **newlinks;
104  AVFilterPad *newpads;
105  unsigned i;
106 
107  idx = FFMIN(idx, *count);
108 
109  newpads = av_realloc_array(*pads, *count + 1, sizeof(AVFilterPad));
110  newlinks = av_realloc_array(*links, *count + 1, sizeof(AVFilterLink*));
111  if (newpads)
112  *pads = newpads;
113  if (newlinks)
114  *links = newlinks;
115  if (!newpads || !newlinks)
116  return AVERROR(ENOMEM);
117 
118  memmove(*pads + idx + 1, *pads + idx, sizeof(AVFilterPad) * (*count - idx));
119  memmove(*links + idx + 1, *links + idx, sizeof(AVFilterLink*) * (*count - idx));
120  memcpy(*pads + idx, newpad, sizeof(AVFilterPad));
121  (*links)[idx] = NULL;
122 
123  (*count)++;
124  for (i = idx + 1; i < *count; i++)
125  if ((*links)[i])
126  (*(unsigned *)((uint8_t *) (*links)[i] + padidx_off))++;
127 
128  return 0;
129 }
130 
131 int avfilter_link(AVFilterContext *src, unsigned srcpad,
132  AVFilterContext *dst, unsigned dstpad)
133 {
134  AVFilterLink *link;
135 
136  if (src->nb_outputs <= srcpad || dst->nb_inputs <= dstpad ||
137  src->outputs[srcpad] || dst->inputs[dstpad])
138  return -1;
139 
140  if (src->output_pads[srcpad].type != dst->input_pads[dstpad].type) {
141  av_log(src, AV_LOG_ERROR,
142  "Media type mismatch between the '%s' filter output pad %d (%s) and the '%s' filter input pad %d (%s)\n",
143  src->name, srcpad, (char *)av_x_if_null(av_get_media_type_string(src->output_pads[srcpad].type), "?"),
144  dst->name, dstpad, (char *)av_x_if_null(av_get_media_type_string(dst-> input_pads[dstpad].type), "?"));
145  return AVERROR(EINVAL);
146  }
147 
148  link = av_mallocz(sizeof(*link));
149  if (!link)
150  return AVERROR(ENOMEM);
151 
152  src->outputs[srcpad] = dst->inputs[dstpad] = link;
153 
154  link->src = src;
155  link->dst = dst;
156  link->srcpad = &src->output_pads[srcpad];
157  link->dstpad = &dst->input_pads[dstpad];
158  link->type = src->output_pads[srcpad].type;
160  link->format = -1;
161 
162  return 0;
163 }
164 
166 {
167  if (!*link)
168  return;
169 
170  av_frame_free(&(*link)->partial_buf);
171 
172  av_freep(link);
173 }
174 
176 {
177  return link->channels;
178 }
179 
180 void avfilter_link_set_closed(AVFilterLink *link, int closed)
181 {
182  link->closed = closed;
183 }
184 
186  unsigned filt_srcpad_idx, unsigned filt_dstpad_idx)
187 {
188  int ret;
189  unsigned dstpad_idx = link->dstpad - link->dst->input_pads;
190 
191  av_log(link->dst, AV_LOG_VERBOSE, "auto-inserting filter '%s' "
192  "between the filter '%s' and the filter '%s'\n",
193  filt->name, link->src->name, link->dst->name);
194 
195  link->dst->inputs[dstpad_idx] = NULL;
196  if ((ret = avfilter_link(filt, filt_dstpad_idx, link->dst, dstpad_idx)) < 0) {
197  /* failed to link output filter to new filter */
198  link->dst->inputs[dstpad_idx] = link;
199  return ret;
200  }
201 
202  /* re-hookup the link to the new destination filter we inserted */
203  link->dst = filt;
204  link->dstpad = &filt->input_pads[filt_srcpad_idx];
205  filt->inputs[filt_srcpad_idx] = link;
206 
207  /* if any information on supported media formats already exists on the
208  * link, we need to preserve that */
209  if (link->out_formats)
211  &filt->outputs[filt_dstpad_idx]->out_formats);
212  if (link->out_samplerates)
214  &filt->outputs[filt_dstpad_idx]->out_samplerates);
215  if (link->out_channel_layouts)
217  &filt->outputs[filt_dstpad_idx]->out_channel_layouts);
218 
219  return 0;
220 }
221 
223 {
224  int (*config_link)(AVFilterLink *);
225  unsigned i;
226  int ret;
227 
228  for (i = 0; i < filter->nb_inputs; i ++) {
229  AVFilterLink *link = filter->inputs[i];
230  AVFilterLink *inlink;
231 
232  if (!link) continue;
233  if (!link->src || !link->dst) {
234  av_log(filter, AV_LOG_ERROR,
235  "Not all input and output are properly linked (%d).\n", i);
236  return AVERROR(EINVAL);
237  }
238 
239  inlink = link->src->nb_inputs ? link->src->inputs[0] : NULL;
240  link->current_pts = AV_NOPTS_VALUE;
241 
242  switch (link->init_state) {
243  case AVLINK_INIT:
244  continue;
245  case AVLINK_STARTINIT:
246  av_log(filter, AV_LOG_INFO, "circular filter chain detected\n");
247  return 0;
248  case AVLINK_UNINIT:
249  link->init_state = AVLINK_STARTINIT;
250 
251  if ((ret = avfilter_config_links(link->src)) < 0)
252  return ret;
253 
254  if (!(config_link = link->srcpad->config_props)) {
255  if (link->src->nb_inputs != 1) {
256  av_log(link->src, AV_LOG_ERROR, "Source filters and filters "
257  "with more than one input "
258  "must set config_props() "
259  "callbacks on all outputs\n");
260  return AVERROR(EINVAL);
261  }
262  } else if ((ret = config_link(link)) < 0) {
263  av_log(link->src, AV_LOG_ERROR,
264  "Failed to configure output pad on %s\n",
265  link->src->name);
266  return ret;
267  }
268 
269  switch (link->type) {
270  case AVMEDIA_TYPE_VIDEO:
271  if (!link->time_base.num && !link->time_base.den)
272  link->time_base = inlink ? inlink->time_base : AV_TIME_BASE_Q;
273 
274  if (!link->sample_aspect_ratio.num && !link->sample_aspect_ratio.den)
275  link->sample_aspect_ratio = inlink ?
276  inlink->sample_aspect_ratio : (AVRational){1,1};
277 
278  if (inlink && !link->frame_rate.num && !link->frame_rate.den)
279  link->frame_rate = inlink->frame_rate;
280 
281  if (inlink) {
282  if (!link->w)
283  link->w = inlink->w;
284  if (!link->h)
285  link->h = inlink->h;
286  } else if (!link->w || !link->h) {
287  av_log(link->src, AV_LOG_ERROR,
288  "Video source filters must set their output link's "
289  "width and height\n");
290  return AVERROR(EINVAL);
291  }
292  break;
293 
294  case AVMEDIA_TYPE_AUDIO:
295  if (inlink) {
296  if (!link->time_base.num && !link->time_base.den)
297  link->time_base = inlink->time_base;
298  }
299 
300  if (!link->time_base.num && !link->time_base.den)
301  link->time_base = (AVRational) {1, link->sample_rate};
302  }
303 
304  if ((config_link = link->dstpad->config_props))
305  if ((ret = config_link(link)) < 0) {
306  av_log(link->dst, AV_LOG_ERROR,
307  "Failed to configure input pad on %s\n",
308  link->dst->name);
309  return ret;
310  }
311 
312  link->init_state = AVLINK_INIT;
313  }
314  }
315 
316  return 0;
317 }
318 
319 void ff_tlog_link(void *ctx, AVFilterLink *link, int end)
320 {
321  if (link->type == AVMEDIA_TYPE_VIDEO) {
322  ff_tlog(ctx,
323  "link[%p s:%dx%d fmt:%s %s->%s]%s",
324  link, link->w, link->h,
326  link->src ? link->src->filter->name : "",
327  link->dst ? link->dst->filter->name : "",
328  end ? "\n" : "");
329  } else {
330  char buf[128];
331  av_get_channel_layout_string(buf, sizeof(buf), -1, link->channel_layout);
332 
333  ff_tlog(ctx,
334  "link[%p r:%d cl:%s fmt:%s %s->%s]%s",
335  link, (int)link->sample_rate, buf,
337  link->src ? link->src->filter->name : "",
338  link->dst ? link->dst->filter->name : "",
339  end ? "\n" : "");
340  }
341 }
342 
344 {
345  int ret = -1;
346  FF_TPRINTF_START(NULL, request_frame); ff_tlog_link(NULL, link, 1);
347 
348  if (link->closed)
349  return AVERROR_EOF;
350  av_assert0(!link->frame_requested);
351  link->frame_requested = 1;
352  while (link->frame_requested) {
353  if (link->srcpad->request_frame)
354  ret = link->srcpad->request_frame(link);
355  else if (link->src->inputs[0])
356  ret = ff_request_frame(link->src->inputs[0]);
357  if (ret == AVERROR_EOF && link->partial_buf) {
358  AVFrame *pbuf = link->partial_buf;
359  link->partial_buf = NULL;
360  ret = ff_filter_frame_framed(link, pbuf);
361  }
362  if (ret < 0) {
363  link->frame_requested = 0;
364  if (ret == AVERROR_EOF)
365  link->closed = 1;
366  } else {
367  av_assert0(!link->frame_requested ||
369  }
370  }
371  return ret;
372 }
373 
375 {
376  int i, min = INT_MAX;
377 
378  if (link->srcpad->poll_frame)
379  return link->srcpad->poll_frame(link);
380 
381  for (i = 0; i < link->src->nb_inputs; i++) {
382  int val;
383  if (!link->src->inputs[i])
384  return -1;
385  val = ff_poll_frame(link->src->inputs[i]);
386  min = FFMIN(min, val);
387  }
388 
389  return min;
390 }
391 
392 static const char *const var_names[] = {
393  "t",
394  "n",
395  "pos",
396  "w",
397  "h",
398  NULL
399 };
400 
401 enum {
408 };
409 
410 static int set_enable_expr(AVFilterContext *ctx, const char *expr)
411 {
412  int ret;
413  char *expr_dup;
414  AVExpr *old = ctx->enable;
415 
417  av_log(ctx, AV_LOG_ERROR, "Timeline ('enable' option) not supported "
418  "with filter '%s'\n", ctx->filter->name);
419  return AVERROR_PATCHWELCOME;
420  }
421 
422  expr_dup = av_strdup(expr);
423  if (!expr_dup)
424  return AVERROR(ENOMEM);
425 
426  if (!ctx->var_values) {
427  ctx->var_values = av_calloc(VAR_VARS_NB, sizeof(*ctx->var_values));
428  if (!ctx->var_values) {
429  av_free(expr_dup);
430  return AVERROR(ENOMEM);
431  }
432  }
433 
434  ret = av_expr_parse((AVExpr**)&ctx->enable, expr_dup, var_names,
435  NULL, NULL, NULL, NULL, 0, ctx->priv);
436  if (ret < 0) {
437  av_log(ctx->priv, AV_LOG_ERROR,
438  "Error when evaluating the expression '%s' for enable\n",
439  expr_dup);
440  av_free(expr_dup);
441  return ret;
442  }
443 
444  av_expr_free(old);
445  av_free(ctx->enable_str);
446  ctx->enable_str = expr_dup;
447  return 0;
448 }
449 
450 void ff_update_link_current_pts(AVFilterLink *link, int64_t pts)
451 {
452  if (pts == AV_NOPTS_VALUE)
453  return;
454  link->current_pts = av_rescale_q(pts, link->time_base, AV_TIME_BASE_Q);
455  /* TODO use duration */
456  if (link->graph && link->age_index >= 0)
458 }
459 
460 int avfilter_process_command(AVFilterContext *filter, const char *cmd, const char *arg, char *res, int res_len, int flags)
461 {
462  if(!strcmp(cmd, "ping")){
463  char local_res[256] = {0};
464 
465  if (!res) {
466  res = local_res;
467  res_len = sizeof(local_res);
468  }
469  av_strlcatf(res, res_len, "pong from:%s %s\n", filter->filter->name, filter->name);
470  if (res == local_res)
471  av_log(filter, AV_LOG_INFO, "%s", res);
472  return 0;
473  }else if(!strcmp(cmd, "enable")) {
474  return set_enable_expr(filter, arg);
475  }else if(filter->filter->process_command) {
476  return filter->filter->process_command(filter, cmd, arg, res, res_len, flags);
477  }
478  return AVERROR(ENOSYS);
479 }
480 
483 
484 #if !FF_API_NOCONST_GET_NAME
485 const
486 #endif
488 {
489  const AVFilter *f = NULL;
490 
491  if (!name)
492  return NULL;
493 
494  while ((f = avfilter_next(f)))
495  if (!strcmp(f->name, name))
496  return (AVFilter *)f;
497 
498  return NULL;
499 }
500 
502 {
503  AVFilter **f = last_filter;
504  int i;
505 
506  /* the filter must select generic or internal exclusively */
508 
509  for(i=0; filter->inputs && filter->inputs[i].name; i++) {
510  const AVFilterPad *input = &filter->inputs[i];
511  av_assert0( !input->filter_frame
512  || (!input->start_frame && !input->end_frame));
513  }
514 
515  filter->next = NULL;
516 
517  while(*f || avpriv_atomic_ptr_cas((void * volatile *)f, NULL, filter))
518  f = &(*f)->next;
519  last_filter = &filter->next;
520 
521  return 0;
522 }
523 
524 const AVFilter *avfilter_next(const AVFilter *prev)
525 {
526  return prev ? prev->next : first_filter;
527 }
528 
529 #if FF_API_OLD_FILTER_REGISTER
530 AVFilter **av_filter_next(AVFilter **filter)
531 {
532  return filter ? &(*filter)->next : &first_filter;
533 }
534 
535 void avfilter_uninit(void)
536 {
537 }
538 #endif
539 
541 {
542  int count;
543 
544  if (!pads)
545  return 0;
546 
547  for (count = 0; pads->name; count++)
548  pads++;
549  return count;
550 }
551 
552 static const char *default_filter_name(void *filter_ctx)
553 {
555  return ctx->name ? ctx->name : ctx->filter->name;
556 }
557 
558 static void *filter_child_next(void *obj, void *prev)
559 {
560  AVFilterContext *ctx = obj;
561  if (!prev && ctx->filter && ctx->filter->priv_class && ctx->priv)
562  return ctx->priv;
563  return NULL;
564 }
565 
566 static const AVClass *filter_child_class_next(const AVClass *prev)
567 {
568  const AVFilter *f = NULL;
569 
570  /* find the filter that corresponds to prev */
571  while (prev && (f = avfilter_next(f)))
572  if (f->priv_class == prev)
573  break;
574 
575  /* could not find filter corresponding to prev */
576  if (prev && !f)
577  return NULL;
578 
579  /* find next filter with specific options */
580  while ((f = avfilter_next(f)))
581  if (f->priv_class)
582  return f->priv_class;
583 
584  return NULL;
585 }
586 
587 #define OFFSET(x) offsetof(AVFilterContext, x)
588 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM
589 static const AVOption avfilter_options[] = {
590  { "thread_type", "Allowed thread types", OFFSET(thread_type), AV_OPT_TYPE_FLAGS,
591  { .i64 = AVFILTER_THREAD_SLICE }, 0, INT_MAX, FLAGS, "thread_type" },
592  { "slice", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AVFILTER_THREAD_SLICE }, .unit = "thread_type" },
593  { "enable", "set enable expression", OFFSET(enable_str), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
594  { NULL },
595 };
596 
597 static const AVClass avfilter_class = {
598  .class_name = "AVFilter",
599  .item_name = default_filter_name,
600  .version = LIBAVUTIL_VERSION_INT,
601  .category = AV_CLASS_CATEGORY_FILTER,
602  .child_next = filter_child_next,
603  .child_class_next = filter_child_class_next,
605 };
606 
608  int *ret, int nb_jobs)
609 {
610  int i;
611 
612  for (i = 0; i < nb_jobs; i++) {
613  int r = func(ctx, arg, i, nb_jobs);
614  if (ret)
615  ret[i] = r;
616  }
617  return 0;
618 }
619 
620 AVFilterContext *ff_filter_alloc(const AVFilter *filter, const char *inst_name)
621 {
623 
624  if (!filter)
625  return NULL;
626 
627  ret = av_mallocz(sizeof(AVFilterContext));
628  if (!ret)
629  return NULL;
630 
631  ret->av_class = &avfilter_class;
632  ret->filter = filter;
633  ret->name = inst_name ? av_strdup(inst_name) : NULL;
634  if (filter->priv_size) {
635  ret->priv = av_mallocz(filter->priv_size);
636  if (!ret->priv)
637  goto err;
638  }
639 
640  av_opt_set_defaults(ret);
641  if (filter->priv_class) {
642  *(const AVClass**)ret->priv = filter->priv_class;
644  }
645 
646  ret->internal = av_mallocz(sizeof(*ret->internal));
647  if (!ret->internal)
648  goto err;
650 
651  ret->nb_inputs = avfilter_pad_count(filter->inputs);
652  if (ret->nb_inputs ) {
653  ret->input_pads = av_malloc_array(ret->nb_inputs, sizeof(AVFilterPad));
654  if (!ret->input_pads)
655  goto err;
656  memcpy(ret->input_pads, filter->inputs, sizeof(AVFilterPad) * ret->nb_inputs);
657  ret->inputs = av_mallocz_array(ret->nb_inputs, sizeof(AVFilterLink*));
658  if (!ret->inputs)
659  goto err;
660  }
661 
662  ret->nb_outputs = avfilter_pad_count(filter->outputs);
663  if (ret->nb_outputs) {
664  ret->output_pads = av_malloc_array(ret->nb_outputs, sizeof(AVFilterPad));
665  if (!ret->output_pads)
666  goto err;
667  memcpy(ret->output_pads, filter->outputs, sizeof(AVFilterPad) * ret->nb_outputs);
668  ret->outputs = av_mallocz_array(ret->nb_outputs, sizeof(AVFilterLink*));
669  if (!ret->outputs)
670  goto err;
671  }
672 #if FF_API_FOO_COUNT
674  ret->output_count = ret->nb_outputs;
675  ret->input_count = ret->nb_inputs;
677 #endif
678 
679  return ret;
680 
681 err:
682  av_freep(&ret->inputs);
683  av_freep(&ret->input_pads);
684  ret->nb_inputs = 0;
685  av_freep(&ret->outputs);
686  av_freep(&ret->output_pads);
687  ret->nb_outputs = 0;
688  av_freep(&ret->priv);
689  av_freep(&ret->internal);
690  av_free(ret);
691  return NULL;
692 }
693 
694 #if FF_API_AVFILTER_OPEN
695 int avfilter_open(AVFilterContext **filter_ctx, AVFilter *filter, const char *inst_name)
696 {
697  *filter_ctx = ff_filter_alloc(filter, inst_name);
698  return *filter_ctx ? 0 : AVERROR(ENOMEM);
699 }
700 #endif
701 
702 static void free_link(AVFilterLink *link)
703 {
704  if (!link)
705  return;
706 
707  if (link->src)
708  link->src->outputs[link->srcpad - link->src->output_pads] = NULL;
709  if (link->dst)
710  link->dst->inputs[link->dstpad - link->dst->input_pads] = NULL;
711 
718  avfilter_link_free(&link);
719 }
720 
722 {
723  int i;
724 
725  if (!filter)
726  return;
727 
728  if (filter->graph)
729  ff_filter_graph_remove_filter(filter->graph, filter);
730 
731  if (filter->filter->uninit)
732  filter->filter->uninit(filter);
733 
734  for (i = 0; i < filter->nb_inputs; i++) {
735  free_link(filter->inputs[i]);
736  }
737  for (i = 0; i < filter->nb_outputs; i++) {
738  free_link(filter->outputs[i]);
739  }
740 
741  if (filter->filter->priv_class)
742  av_opt_free(filter->priv);
743 
744  av_freep(&filter->name);
745  av_freep(&filter->input_pads);
746  av_freep(&filter->output_pads);
747  av_freep(&filter->inputs);
748  av_freep(&filter->outputs);
749  av_freep(&filter->priv);
750  while(filter->command_queue){
751  ff_command_queue_pop(filter);
752  }
753  av_opt_free(filter);
754  av_expr_free(filter->enable);
755  filter->enable = NULL;
756  av_freep(&filter->var_values);
757  av_freep(&filter->internal);
758  av_free(filter);
759 }
760 
762  const char *args)
763 {
764  const AVOption *o = NULL;
765  int ret, count = 0;
766  char *av_uninit(parsed_key), *av_uninit(value);
767  const char *key;
768  int offset= -1;
769 
770  if (!args)
771  return 0;
772 
773  while (*args) {
774  const char *shorthand = NULL;
775 
776  o = av_opt_next(ctx->priv, o);
777  if (o) {
778  if (o->type == AV_OPT_TYPE_CONST || o->offset == offset)
779  continue;
780  offset = o->offset;
781  shorthand = o->name;
782  }
783 
784  ret = av_opt_get_key_value(&args, "=", ":",
785  shorthand ? AV_OPT_FLAG_IMPLICIT_KEY : 0,
786  &parsed_key, &value);
787  if (ret < 0) {
788  if (ret == AVERROR(EINVAL))
789  av_log(ctx, AV_LOG_ERROR, "No option name near '%s'\n", args);
790  else
791  av_log(ctx, AV_LOG_ERROR, "Unable to parse '%s': %s\n", args,
792  av_err2str(ret));
793  return ret;
794  }
795  if (*args)
796  args++;
797  if (parsed_key) {
798  key = parsed_key;
799  while ((o = av_opt_next(ctx->priv, o))); /* discard all remaining shorthand */
800  } else {
801  key = shorthand;
802  }
803 
804  av_log(ctx, AV_LOG_DEBUG, "Setting '%s' to value '%s'\n", key, value);
805 
806  if (av_opt_find(ctx, key, NULL, 0, 0)) {
807  ret = av_opt_set(ctx, key, value, 0);
808  if (ret < 0) {
809  av_free(value);
810  av_free(parsed_key);
811  return ret;
812  }
813  } else {
814  av_dict_set(options, key, value, 0);
815  if ((ret = av_opt_set(ctx->priv, key, value, 0)) < 0) {
816  if (!av_opt_find(ctx->priv, key, NULL, 0, AV_OPT_SEARCH_CHILDREN | AV_OPT_SEARCH_FAKE_OBJ)) {
817  if (ret == AVERROR_OPTION_NOT_FOUND)
818  av_log(ctx, AV_LOG_ERROR, "Option '%s' not found\n", key);
819  av_free(value);
820  av_free(parsed_key);
821  return ret;
822  }
823  }
824  }
825 
826  av_free(value);
827  av_free(parsed_key);
828  count++;
829  }
830 
831  if (ctx->enable_str) {
832  ret = set_enable_expr(ctx, ctx->enable_str);
833  if (ret < 0)
834  return ret;
835  }
836  return count;
837 }
838 
839 #if FF_API_AVFILTER_INIT_FILTER
840 int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque)
841 {
842  return avfilter_init_str(filter, args);
843 }
844 #endif
845 
847 {
848  int ret = 0;
849 
850  ret = av_opt_set_dict(ctx, options);
851  if (ret < 0) {
852  av_log(ctx, AV_LOG_ERROR, "Error applying generic filter options.\n");
853  return ret;
854  }
855 
858  ctx->graph->internal->thread_execute) {
861  } else {
862  ctx->thread_type = 0;
863  }
864 
865  if (ctx->filter->priv_class) {
866  ret = av_opt_set_dict(ctx->priv, options);
867  if (ret < 0) {
868  av_log(ctx, AV_LOG_ERROR, "Error applying options to the filter.\n");
869  return ret;
870  }
871  }
872 
873  if (ctx->filter->init_opaque)
874  ret = ctx->filter->init_opaque(ctx, NULL);
875  else if (ctx->filter->init)
876  ret = ctx->filter->init(ctx);
877  else if (ctx->filter->init_dict)
878  ret = ctx->filter->init_dict(ctx, options);
879 
880  return ret;
881 }
882 
884 {
885  AVDictionary *options = NULL;
887  int ret = 0;
888 
889  if (args && *args) {
890  if (!filter->filter->priv_class) {
891  av_log(filter, AV_LOG_ERROR, "This filter does not take any "
892  "options, but options were provided: %s.\n", args);
893  return AVERROR(EINVAL);
894  }
895 
896 #if FF_API_OLD_FILTER_OPTS
897  if ( !strcmp(filter->filter->name, "format") ||
898  !strcmp(filter->filter->name, "noformat") ||
899  !strcmp(filter->filter->name, "frei0r") ||
900  !strcmp(filter->filter->name, "frei0r_src") ||
901  !strcmp(filter->filter->name, "ocv") ||
902  !strcmp(filter->filter->name, "pan") ||
903  !strcmp(filter->filter->name, "pp") ||
904  !strcmp(filter->filter->name, "aevalsrc")) {
905  /* a hack for compatibility with the old syntax
906  * replace colons with |s */
907  char *copy = av_strdup(args);
908  char *p = copy;
909  int nb_leading = 0; // number of leading colons to skip
910  int deprecated = 0;
911 
912  if (!copy) {
913  ret = AVERROR(ENOMEM);
914  goto fail;
915  }
916 
917  if (!strcmp(filter->filter->name, "frei0r") ||
918  !strcmp(filter->filter->name, "ocv"))
919  nb_leading = 1;
920  else if (!strcmp(filter->filter->name, "frei0r_src"))
921  nb_leading = 3;
922 
923  while (nb_leading--) {
924  p = strchr(p, ':');
925  if (!p) {
926  p = copy + strlen(copy);
927  break;
928  }
929  p++;
930  }
931 
932  deprecated = strchr(p, ':') != NULL;
933 
934  if (!strcmp(filter->filter->name, "aevalsrc")) {
935  deprecated = 0;
936  while ((p = strchr(p, ':')) && p[1] != ':') {
937  const char *epos = strchr(p + 1, '=');
938  const char *spos = strchr(p + 1, ':');
939  const int next_token_is_opt = epos && (!spos || epos < spos);
940  if (next_token_is_opt) {
941  p++;
942  break;
943  }
944  /* next token does not contain a '=', assume a channel expression */
945  deprecated = 1;
946  *p++ = '|';
947  }
948  if (p && *p == ':') { // double sep '::' found
949  deprecated = 1;
950  memmove(p, p + 1, strlen(p));
951  }
952  } else
953  while ((p = strchr(p, ':')))
954  *p++ = '|';
955 
956  if (deprecated)
957  av_log(filter, AV_LOG_WARNING, "This syntax is deprecated. Use "
958  "'|' to separate the list items.\n");
959 
960  av_log(filter, AV_LOG_DEBUG, "compat: called with args=[%s]\n", copy);
961  ret = process_options(filter, &options, copy);
962  av_freep(&copy);
963 
964  if (ret < 0)
965  goto fail;
966 #endif
967  } else {
968 #if CONFIG_MP_FILTER
969  if (!strcmp(filter->filter->name, "mp")) {
970  char *escaped;
971 
972  if (!strncmp(args, "filter=", 7))
973  args += 7;
974  ret = av_escape(&escaped, args, ":=", AV_ESCAPE_MODE_BACKSLASH, 0);
975  if (ret < 0) {
976  av_log(filter, AV_LOG_ERROR, "Unable to escape MPlayer filters arg '%s'\n", args);
977  goto fail;
978  }
979  ret = process_options(filter, &options, escaped);
980  av_free(escaped);
981  } else
982 #endif
983  ret = process_options(filter, &options, args);
984  if (ret < 0)
985  goto fail;
986  }
987  }
988 
989  ret = avfilter_init_dict(filter, &options);
990  if (ret < 0)
991  goto fail;
992 
993  if ((e = av_dict_get(options, "", NULL, AV_DICT_IGNORE_SUFFIX))) {
994  av_log(filter, AV_LOG_ERROR, "No such option: %s.\n", e->key);
996  goto fail;
997  }
998 
999 fail:
1000  av_dict_free(&options);
1001 
1002  return ret;
1003 }
1004 
1005 const char *avfilter_pad_get_name(const AVFilterPad *pads, int pad_idx)
1006 {
1007  return pads[pad_idx].name;
1008 }
1009 
1010 enum AVMediaType avfilter_pad_get_type(const AVFilterPad *pads, int pad_idx)
1011 {
1012  return pads[pad_idx].type;
1013 }
1014 
1016 {
1017  return ff_filter_frame(link->dst->outputs[0], frame);
1018 }
1019 
1021 {
1022  int (*filter_frame)(AVFilterLink *, AVFrame *);
1023  AVFilterContext *dstctx = link->dst;
1024  AVFilterPad *dst = link->dstpad;
1025  AVFrame *out = NULL;
1026  int ret;
1027  AVFilterCommand *cmd= link->dst->command_queue;
1028  int64_t pts;
1029 
1030  if (link->closed) {
1031  av_frame_free(&frame);
1032  return AVERROR_EOF;
1033  }
1034 
1035  if (!(filter_frame = dst->filter_frame))
1037 
1038  /* copy the frame if needed */
1039  if (dst->needs_writable && !av_frame_is_writable(frame)) {
1040  av_log(link->dst, AV_LOG_DEBUG, "Copying data in avfilter.\n");
1041 
1042  /* Maybe use ff_copy_buffer_ref instead? */
1043  switch (link->type) {
1044  case AVMEDIA_TYPE_VIDEO:
1045  out = ff_get_video_buffer(link, link->w, link->h);
1046  break;
1047  case AVMEDIA_TYPE_AUDIO:
1048  out = ff_get_audio_buffer(link, frame->nb_samples);
1049  break;
1050  default:
1051  ret = AVERROR(EINVAL);
1052  goto fail;
1053  }
1054  if (!out) {
1055  ret = AVERROR(ENOMEM);
1056  goto fail;
1057  }
1058 
1059  ret = av_frame_copy_props(out, frame);
1060  if (ret < 0)
1061  goto fail;
1062 
1063  switch (link->type) {
1064  case AVMEDIA_TYPE_VIDEO:
1065  av_image_copy(out->data, out->linesize, (const uint8_t **)frame->data, frame->linesize,
1066  frame->format, frame->width, frame->height);
1067  break;
1068  case AVMEDIA_TYPE_AUDIO:
1070  0, 0, frame->nb_samples,
1072  frame->format);
1073  break;
1074  default:
1075  ret = AVERROR(EINVAL);
1076  goto fail;
1077  }
1078 
1079  av_frame_free(&frame);
1080  } else
1081  out = frame;
1082 
1083  while(cmd && cmd->time <= out->pts * av_q2d(link->time_base)){
1084  av_log(link->dst, AV_LOG_DEBUG,
1085  "Processing command time:%f command:%s arg:%s\n",
1086  cmd->time, cmd->command, cmd->arg);
1087  avfilter_process_command(link->dst, cmd->command, cmd->arg, 0, 0, cmd->flags);
1088  ff_command_queue_pop(link->dst);
1089  cmd= link->dst->command_queue;
1090  }
1091 
1092  pts = out->pts;
1093  if (dstctx->enable_str) {
1094  int64_t pos = av_frame_get_pkt_pos(out);
1095  dstctx->var_values[VAR_N] = link->frame_count;
1096  dstctx->var_values[VAR_T] = pts == AV_NOPTS_VALUE ? NAN : pts * av_q2d(link->time_base);
1097  dstctx->var_values[VAR_W] = link->w;
1098  dstctx->var_values[VAR_H] = link->h;
1099  dstctx->var_values[VAR_POS] = pos == -1 ? NAN : pos;
1100 
1101  dstctx->is_disabled = fabs(av_expr_eval(dstctx->enable, dstctx->var_values, NULL)) < 0.5;
1102  if (dstctx->is_disabled &&
1105  }
1106  ret = filter_frame(link, out);
1107  link->frame_count++;
1108  link->frame_requested = 0;
1109  ff_update_link_current_pts(link, pts);
1110  return ret;
1111 
1112 fail:
1113  av_frame_free(&out);
1114  av_frame_free(&frame);
1115  return ret;
1116 }
1117 
1119 {
1120  int insamples = frame->nb_samples, inpos = 0, nb_samples;
1121  AVFrame *pbuf = link->partial_buf;
1122  int nb_channels = av_frame_get_channels(frame);
1123  int ret = 0;
1124 
1126  /* Handle framing (min_samples, max_samples) */
1127  while (insamples) {
1128  if (!pbuf) {
1129  AVRational samples_tb = { 1, link->sample_rate };
1130  pbuf = ff_get_audio_buffer(link, link->partial_buf_size);
1131  if (!pbuf) {
1132  av_log(link->dst, AV_LOG_WARNING,
1133  "Samples dropped due to memory allocation failure.\n");
1134  return 0;
1135  }
1136  av_frame_copy_props(pbuf, frame);
1137  pbuf->pts = frame->pts;
1138  if (pbuf->pts != AV_NOPTS_VALUE)
1139  pbuf->pts += av_rescale_q(inpos, samples_tb, link->time_base);
1140  pbuf->nb_samples = 0;
1141  }
1142  nb_samples = FFMIN(insamples,
1143  link->partial_buf_size - pbuf->nb_samples);
1145  pbuf->nb_samples, inpos,
1146  nb_samples, nb_channels, link->format);
1147  inpos += nb_samples;
1148  insamples -= nb_samples;
1149  pbuf->nb_samples += nb_samples;
1150  if (pbuf->nb_samples >= link->min_samples) {
1151  ret = ff_filter_frame_framed(link, pbuf);
1152  pbuf = NULL;
1153  }
1154  }
1155  av_frame_free(&frame);
1156  link->partial_buf = pbuf;
1157  return ret;
1158 }
1159 
1161 {
1162  FF_TPRINTF_START(NULL, filter_frame); ff_tlog_link(NULL, link, 1); ff_tlog(NULL, " "); ff_tlog_ref(NULL, frame, 1);
1163 
1164  /* Consistency checks */
1165  if (link->type == AVMEDIA_TYPE_VIDEO) {
1166  if (strcmp(link->dst->filter->name, "scale") &&
1167  strcmp(link->dst->filter->name, "idet")) {
1168  av_assert1(frame->format == link->format);
1169  av_assert1(frame->width == link->w);
1170  av_assert1(frame->height == link->h);
1171  }
1172  } else {
1173  av_assert1(frame->format == link->format);
1174  av_assert1(av_frame_get_channels(frame) == link->channels);
1175  av_assert1(frame->channel_layout == link->channel_layout);
1176  av_assert1(frame->sample_rate == link->sample_rate);
1177  }
1178 
1179  /* Go directly to actual filtering if possible */
1180  if (link->type == AVMEDIA_TYPE_AUDIO &&
1181  link->min_samples &&
1182  (link->partial_buf ||
1183  frame->nb_samples < link->min_samples ||
1184  frame->nb_samples > link->max_samples)) {
1185  return ff_filter_frame_needs_framing(link, frame);
1186  } else {
1187  return ff_filter_frame_framed(link, frame);
1188  }
1189 }
1190 
1192 {
1193  return &avfilter_class;
1194 }