c0ead5c4beb941dea30cc81d6d059298009d9c01
[libav.git] / libavfilter / avfilter.c
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 /* #define DEBUG */
23
24 #include "libavutil/pixdesc.h"
25 #include "libavutil/rational.h"
26 #include "libavutil/audioconvert.h"
27 #include "libavutil/imgutils.h"
28 #include "avfilter.h"
29 #include "internal.h"
30
31 unsigned avfilter_version(void) {
32 return LIBAVFILTER_VERSION_INT;
33 }
34
35 const char *avfilter_configuration(void)
36 {
37 return LIBAV_CONFIGURATION;
38 }
39
40 const char *avfilter_license(void)
41 {
42 #define LICENSE_PREFIX "libavfilter license: "
43 return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
44 }
45
46 AVFilterBufferRef *avfilter_ref_buffer(AVFilterBufferRef *ref, int pmask)
47 {
48 AVFilterBufferRef *ret = av_malloc(sizeof(AVFilterBufferRef));
49 if (!ret)
50 return NULL;
51 *ret = *ref;
52 if (ref->type == AVMEDIA_TYPE_VIDEO) {
53 ret->video = av_malloc(sizeof(AVFilterBufferRefVideoProps));
54 if (!ret->video) {
55 av_free(ret);
56 return NULL;
57 }
58 *ret->video = *ref->video;
59 } else if (ref->type == AVMEDIA_TYPE_AUDIO) {
60 ret->audio = av_malloc(sizeof(AVFilterBufferRefAudioProps));
61 if (!ret->audio) {
62 av_free(ret);
63 return NULL;
64 }
65 *ret->audio = *ref->audio;
66 }
67 ret->perms &= pmask;
68 ret->buf->refcount ++;
69 return ret;
70 }
71
72 void avfilter_unref_buffer(AVFilterBufferRef *ref)
73 {
74 if (!ref)
75 return;
76 if (!(--ref->buf->refcount))
77 ref->buf->free(ref->buf);
78 av_free(ref->video);
79 av_free(ref->audio);
80 av_free(ref);
81 }
82
83 void avfilter_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
84 AVFilterPad **pads, AVFilterLink ***links,
85 AVFilterPad *newpad)
86 {
87 unsigned i;
88
89 idx = FFMIN(idx, *count);
90
91 *pads = av_realloc(*pads, sizeof(AVFilterPad) * (*count + 1));
92 *links = av_realloc(*links, sizeof(AVFilterLink*) * (*count + 1));
93 memmove(*pads +idx+1, *pads +idx, sizeof(AVFilterPad) * (*count-idx));
94 memmove(*links+idx+1, *links+idx, sizeof(AVFilterLink*) * (*count-idx));
95 memcpy(*pads+idx, newpad, sizeof(AVFilterPad));
96 (*links)[idx] = NULL;
97
98 (*count)++;
99 for (i = idx+1; i < *count; i++)
100 if (*links[i])
101 (*(unsigned *)((uint8_t *) *links[i] + padidx_off))++;
102 }
103
104 int avfilter_link(AVFilterContext *src, unsigned srcpad,
105 AVFilterContext *dst, unsigned dstpad)
106 {
107 AVFilterLink *link;
108
109 if (src->output_count <= srcpad || dst->input_count <= dstpad ||
110 src->outputs[srcpad] || dst->inputs[dstpad])
111 return -1;
112
113 if (src->output_pads[srcpad].type != dst->input_pads[dstpad].type) {
114 av_log(src, AV_LOG_ERROR,
115 "Media type mismatch between the '%s' filter output pad %d and the '%s' filter input pad %d\n",
116 src->name, srcpad, dst->name, dstpad);
117 return AVERROR(EINVAL);
118 }
119
120 src->outputs[srcpad] =
121 dst-> inputs[dstpad] = link = av_mallocz(sizeof(AVFilterLink));
122
123 link->src = src;
124 link->dst = dst;
125 link->srcpad = &src->output_pads[srcpad];
126 link->dstpad = &dst->input_pads[dstpad];
127 link->type = src->output_pads[srcpad].type;
128 assert(PIX_FMT_NONE == -1 && AV_SAMPLE_FMT_NONE == -1);
129 link->format = -1;
130
131 return 0;
132 }
133
134 int avfilter_insert_filter(AVFilterLink *link, AVFilterContext *filt,
135 unsigned filt_srcpad_idx, unsigned filt_dstpad_idx)
136 {
137 int ret;
138 unsigned dstpad_idx = link->dstpad - link->dst->input_pads;
139
140 av_log(link->dst, AV_LOG_INFO, "auto-inserting filter '%s' "
141 "between the filter '%s' and the filter '%s'\n",
142 filt->name, link->src->name, link->dst->name);
143
144 link->dst->inputs[dstpad_idx] = NULL;
145 if ((ret = avfilter_link(filt, filt_dstpad_idx, link->dst, dstpad_idx)) < 0) {
146 /* failed to link output filter to new filter */
147 link->dst->inputs[dstpad_idx] = link;
148 return ret;
149 }
150
151 /* re-hookup the link to the new destination filter we inserted */
152 link->dst = filt;
153 link->dstpad = &filt->input_pads[filt_srcpad_idx];
154 filt->inputs[filt_srcpad_idx] = link;
155
156 /* if any information on supported media formats already exists on the
157 * link, we need to preserve that */
158 if (link->out_formats)
159 avfilter_formats_changeref(&link->out_formats,
160 &filt->outputs[filt_dstpad_idx]->out_formats);
161
162 return 0;
163 }
164
165 int avfilter_config_links(AVFilterContext *filter)
166 {
167 int (*config_link)(AVFilterLink *);
168 unsigned i;
169 int ret;
170
171 for (i = 0; i < filter->input_count; i ++) {
172 AVFilterLink *link = filter->inputs[i];
173
174 if (!link) continue;
175
176 switch (link->init_state) {
177 case AVLINK_INIT:
178 continue;
179 case AVLINK_STARTINIT:
180 av_log(filter, AV_LOG_INFO, "circular filter chain detected\n");
181 return 0;
182 case AVLINK_UNINIT:
183 link->init_state = AVLINK_STARTINIT;
184
185 if ((ret = avfilter_config_links(link->src)) < 0)
186 return ret;
187
188 if (!(config_link = link->srcpad->config_props))
189 config_link = avfilter_default_config_output_link;
190 if ((ret = config_link(link)) < 0)
191 return ret;
192
193 if (link->time_base.num == 0 && link->time_base.den == 0)
194 link->time_base = link->src && link->src->input_count ?
195 link->src->inputs[0]->time_base : AV_TIME_BASE_Q;
196
197 if (link->sample_aspect_ratio.num == 0 && link->sample_aspect_ratio.den == 0)
198 link->sample_aspect_ratio = link->src->input_count ?
199 link->src->inputs[0]->sample_aspect_ratio : (AVRational){1,1};
200
201 if (link->sample_rate == 0 && link->src && link->src->input_count)
202 link->sample_rate = link->src->inputs[0]->sample_rate;
203
204 if (link->channel_layout == 0 && link->src && link->src->input_count)
205 link->channel_layout = link->src->inputs[0]->channel_layout;
206
207 if ((config_link = link->dstpad->config_props))
208 if ((ret = config_link(link)) < 0)
209 return ret;
210
211 link->init_state = AVLINK_INIT;
212 }
213 }
214
215 return 0;
216 }
217
218 static char *ff_get_ref_perms_string(char *buf, size_t buf_size, int perms)
219 {
220 snprintf(buf, buf_size, "%s%s%s%s%s%s",
221 perms & AV_PERM_READ ? "r" : "",
222 perms & AV_PERM_WRITE ? "w" : "",
223 perms & AV_PERM_PRESERVE ? "p" : "",
224 perms & AV_PERM_REUSE ? "u" : "",
225 perms & AV_PERM_REUSE2 ? "U" : "",
226 perms & AV_PERM_NEG_LINESIZES ? "n" : "");
227 return buf;
228 }
229
230 static void ff_dlog_ref(void *ctx, AVFilterBufferRef *ref, int end)
231 {
232 av_unused char buf[16];
233 av_dlog(ctx,
234 "ref[%p buf:%p refcount:%d perms:%s data:%p linesize[%d, %d, %d, %d] pts:%"PRId64" pos:%"PRId64,
235 ref, ref->buf, ref->buf->refcount, ff_get_ref_perms_string(buf, sizeof(buf), ref->perms), ref->data[0],
236 ref->linesize[0], ref->linesize[1], ref->linesize[2], ref->linesize[3],
237 ref->pts, ref->pos);
238
239 if (ref->video) {
240 av_dlog(ctx, " a:%d/%d s:%dx%d i:%c",
241 ref->video->pixel_aspect.num, ref->video->pixel_aspect.den,
242 ref->video->w, ref->video->h,
243 !ref->video->interlaced ? 'P' : /* Progressive */
244 ref->video->top_field_first ? 'T' : 'B'); /* Top / Bottom */
245 }
246 if (ref->audio) {
247 av_dlog(ctx, " cl:%"PRId64"d sn:%d s:%d sr:%d p:%d",
248 ref->audio->channel_layout,
249 ref->audio->nb_samples,
250 ref->audio->size,
251 ref->audio->sample_rate,
252 ref->audio->planar);
253 }
254
255 av_dlog(ctx, "]%s", end ? "\n" : "");
256 }
257
258 static void ff_dlog_link(void *ctx, AVFilterLink *link, int end)
259 {
260 if (link->type == AVMEDIA_TYPE_VIDEO) {
261 av_dlog(ctx,
262 "link[%p s:%dx%d fmt:%-16s %-16s->%-16s]%s",
263 link, link->w, link->h,
264 av_pix_fmt_descriptors[link->format].name,
265 link->src ? link->src->filter->name : "",
266 link->dst ? link->dst->filter->name : "",
267 end ? "\n" : "");
268 } else {
269 char buf[128];
270 av_get_channel_layout_string(buf, sizeof(buf), -1, link->channel_layout);
271
272 av_dlog(ctx,
273 "link[%p r:%"PRId64" cl:%s fmt:%-16s %-16s->%-16s]%s",
274 link, link->sample_rate, buf,
275 av_get_sample_fmt_name(link->format),
276 link->src ? link->src->filter->name : "",
277 link->dst ? link->dst->filter->name : "",
278 end ? "\n" : "");
279 }
280 }
281
282 #define FF_DPRINTF_START(ctx, func) av_dlog(NULL, "%-16s: ", #func)
283
284 AVFilterBufferRef *avfilter_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
285 {
286 AVFilterBufferRef *ret = NULL;
287
288 av_unused char buf[16];
289 FF_DPRINTF_START(NULL, get_video_buffer); ff_dlog_link(NULL, link, 0);
290 av_dlog(NULL, " perms:%s w:%d h:%d\n", ff_get_ref_perms_string(buf, sizeof(buf), perms), w, h);
291
292 if (link->dstpad->get_video_buffer)
293 ret = link->dstpad->get_video_buffer(link, perms, w, h);
294
295 if (!ret)
296 ret = avfilter_default_get_video_buffer(link, perms, w, h);
297
298 if (ret)
299 ret->type = AVMEDIA_TYPE_VIDEO;
300
301 FF_DPRINTF_START(NULL, get_video_buffer); ff_dlog_link(NULL, link, 0); av_dlog(NULL, " returning "); ff_dlog_ref(NULL, ret, 1);
302
303 return ret;
304 }
305
306 AVFilterBufferRef *
307 avfilter_get_video_buffer_ref_from_arrays(uint8_t *data[4], int linesize[4], int perms,
308 int w, int h, enum PixelFormat format)
309 {
310 AVFilterBuffer *pic = av_mallocz(sizeof(AVFilterBuffer));
311 AVFilterBufferRef *picref = av_mallocz(sizeof(AVFilterBufferRef));
312
313 if (!pic || !picref)
314 goto fail;
315
316 picref->buf = pic;
317 picref->buf->free = ff_avfilter_default_free_buffer;
318 if (!(picref->video = av_mallocz(sizeof(AVFilterBufferRefVideoProps))))
319 goto fail;
320
321 pic->w = picref->video->w = w;
322 pic->h = picref->video->h = h;
323
324 /* make sure the buffer gets read permission or it's useless for output */
325 picref->perms = perms | AV_PERM_READ;
326
327 pic->refcount = 1;
328 picref->type = AVMEDIA_TYPE_VIDEO;
329 pic->format = picref->format = format;
330
331 memcpy(pic->data, data, sizeof(pic->data));
332 memcpy(pic->linesize, linesize, sizeof(pic->linesize));
333 memcpy(picref->data, pic->data, sizeof(picref->data));
334 memcpy(picref->linesize, pic->linesize, sizeof(picref->linesize));
335
336 return picref;
337
338 fail:
339 if (picref && picref->video)
340 av_free(picref->video);
341 av_free(picref);
342 av_free(pic);
343 return NULL;
344 }
345
346 AVFilterBufferRef *avfilter_get_audio_buffer(AVFilterLink *link, int perms,
347 enum AVSampleFormat sample_fmt, int size,
348 int64_t channel_layout, int planar)
349 {
350 AVFilterBufferRef *ret = NULL;
351
352 if (link->dstpad->get_audio_buffer)
353 ret = link->dstpad->get_audio_buffer(link, perms, sample_fmt, size, channel_layout, planar);
354
355 if (!ret)
356 ret = avfilter_default_get_audio_buffer(link, perms, sample_fmt, size, channel_layout, planar);
357
358 if (ret)
359 ret->type = AVMEDIA_TYPE_AUDIO;
360
361 return ret;
362 }
363
364 int avfilter_request_frame(AVFilterLink *link)
365 {
366 FF_DPRINTF_START(NULL, request_frame); ff_dlog_link(NULL, link, 1);
367
368 if (link->srcpad->request_frame)
369 return link->srcpad->request_frame(link);
370 else if (link->src->inputs[0])
371 return avfilter_request_frame(link->src->inputs[0]);
372 else return -1;
373 }
374
375 int avfilter_poll_frame(AVFilterLink *link)
376 {
377 int i, min = INT_MAX;
378
379 if (link->srcpad->poll_frame)
380 return link->srcpad->poll_frame(link);
381
382 for (i = 0; i < link->src->input_count; i++) {
383 int val;
384 if (!link->src->inputs[i])
385 return -1;
386 val = avfilter_poll_frame(link->src->inputs[i]);
387 min = FFMIN(min, val);
388 }
389
390 return min;
391 }
392
393 /* XXX: should we do the duplicating of the picture ref here, instead of
394 * forcing the source filter to do it? */
395 void avfilter_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
396 {
397 void (*start_frame)(AVFilterLink *, AVFilterBufferRef *);
398 AVFilterPad *dst = link->dstpad;
399 int perms = picref->perms;
400
401 FF_DPRINTF_START(NULL, start_frame); ff_dlog_link(NULL, link, 0); av_dlog(NULL, " "); ff_dlog_ref(NULL, picref, 1);
402
403 if (!(start_frame = dst->start_frame))
404 start_frame = avfilter_default_start_frame;
405
406 if (picref->linesize[0] < 0)
407 perms |= AV_PERM_NEG_LINESIZES;
408 /* prepare to copy the picture if it has insufficient permissions */
409 if ((dst->min_perms & perms) != dst->min_perms || dst->rej_perms & perms) {
410 av_log(link->dst, AV_LOG_DEBUG,
411 "frame copy needed (have perms %x, need %x, reject %x)\n",
412 picref->perms,
413 link->dstpad->min_perms, link->dstpad->rej_perms);
414
415 link->cur_buf = avfilter_get_video_buffer(link, dst->min_perms, link->w, link->h);
416 link->src_buf = picref;
417 avfilter_copy_buffer_ref_props(link->cur_buf, link->src_buf);
418 }
419 else
420 link->cur_buf = picref;
421
422 start_frame(link, link->cur_buf);
423 }
424
425 void avfilter_end_frame(AVFilterLink *link)
426 {
427 void (*end_frame)(AVFilterLink *);
428
429 if (!(end_frame = link->dstpad->end_frame))
430 end_frame = avfilter_default_end_frame;
431
432 end_frame(link);
433
434 /* unreference the source picture if we're feeding the destination filter
435 * a copied version dues to permission issues */
436 if (link->src_buf) {
437 avfilter_unref_buffer(link->src_buf);
438 link->src_buf = NULL;
439 }
440 }
441
442 void avfilter_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
443 {
444 uint8_t *src[4], *dst[4];
445 int i, j, vsub;
446 void (*draw_slice)(AVFilterLink *, int, int, int);
447
448 FF_DPRINTF_START(NULL, draw_slice); ff_dlog_link(NULL, link, 0); av_dlog(NULL, " y:%d h:%d dir:%d\n", y, h, slice_dir);
449
450 /* copy the slice if needed for permission reasons */
451 if (link->src_buf) {
452 vsub = av_pix_fmt_descriptors[link->format].log2_chroma_h;
453
454 for (i = 0; i < 4; i++) {
455 if (link->src_buf->data[i]) {
456 src[i] = link->src_buf-> data[i] +
457 (y >> (i==1 || i==2 ? vsub : 0)) * link->src_buf-> linesize[i];
458 dst[i] = link->cur_buf->data[i] +
459 (y >> (i==1 || i==2 ? vsub : 0)) * link->cur_buf->linesize[i];
460 } else
461 src[i] = dst[i] = NULL;
462 }
463
464 for (i = 0; i < 4; i++) {
465 int planew =
466 av_image_get_linesize(link->format, link->cur_buf->video->w, i);
467
468 if (!src[i]) continue;
469
470 for (j = 0; j < h >> (i==1 || i==2 ? vsub : 0); j++) {
471 memcpy(dst[i], src[i], planew);
472 src[i] += link->src_buf->linesize[i];
473 dst[i] += link->cur_buf->linesize[i];
474 }
475 }
476 }
477
478 if (!(draw_slice = link->dstpad->draw_slice))
479 draw_slice = avfilter_default_draw_slice;
480 draw_slice(link, y, h, slice_dir);
481 }
482
483 void avfilter_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref)
484 {
485 void (*filter_samples)(AVFilterLink *, AVFilterBufferRef *);
486 AVFilterPad *dst = link->dstpad;
487
488 FF_DPRINTF_START(NULL, filter_samples); ff_dlog_link(NULL, link, 1);
489
490 if (!(filter_samples = dst->filter_samples))
491 filter_samples = avfilter_default_filter_samples;
492
493 /* prepare to copy the samples if the buffer has insufficient permissions */
494 if ((dst->min_perms & samplesref->perms) != dst->min_perms ||
495 dst->rej_perms & samplesref->perms) {
496
497 av_log(link->dst, AV_LOG_DEBUG,
498 "Copying audio data in avfilter (have perms %x, need %x, reject %x)\n",
499 samplesref->perms, link->dstpad->min_perms, link->dstpad->rej_perms);
500
501 link->cur_buf = avfilter_default_get_audio_buffer(link, dst->min_perms,
502 samplesref->format,
503 samplesref->audio->size,
504 samplesref->audio->channel_layout,
505 samplesref->audio->planar);
506 link->cur_buf->pts = samplesref->pts;
507 link->cur_buf->audio->sample_rate = samplesref->audio->sample_rate;
508
509 /* Copy actual data into new samples buffer */
510 memcpy(link->cur_buf->data[0], samplesref->data[0], samplesref->audio->size);
511
512 avfilter_unref_buffer(samplesref);
513 } else
514 link->cur_buf = samplesref;
515
516 filter_samples(link, link->cur_buf);
517 }
518
519 #define MAX_REGISTERED_AVFILTERS_NB 64
520
521 static AVFilter *registered_avfilters[MAX_REGISTERED_AVFILTERS_NB + 1];
522
523 static int next_registered_avfilter_idx = 0;
524
525 AVFilter *avfilter_get_by_name(const char *name)
526 {
527 int i;
528
529 for (i = 0; registered_avfilters[i]; i++)
530 if (!strcmp(registered_avfilters[i]->name, name))
531 return registered_avfilters[i];
532
533 return NULL;
534 }
535
536 int avfilter_register(AVFilter *filter)
537 {
538 if (next_registered_avfilter_idx == MAX_REGISTERED_AVFILTERS_NB)
539 return -1;
540
541 registered_avfilters[next_registered_avfilter_idx++] = filter;
542 return 0;
543 }
544
545 AVFilter **av_filter_next(AVFilter **filter)
546 {
547 return filter ? ++filter : &registered_avfilters[0];
548 }
549
550 void avfilter_uninit(void)
551 {
552 memset(registered_avfilters, 0, sizeof(registered_avfilters));
553 next_registered_avfilter_idx = 0;
554 }
555
556 static int pad_count(const AVFilterPad *pads)
557 {
558 int count;
559
560 for(count = 0; pads->name; count ++) pads ++;
561 return count;
562 }
563
564 static const char *filter_name(void *p)
565 {
566 AVFilterContext *filter = p;
567 return filter->filter->name;
568 }
569
570 static const AVClass avfilter_class = {
571 "AVFilter",
572 filter_name,
573 NULL,
574 LIBAVUTIL_VERSION_INT,
575 };
576
577 int avfilter_open(AVFilterContext **filter_ctx, AVFilter *filter, const char *inst_name)
578 {
579 AVFilterContext *ret;
580 *filter_ctx = NULL;
581
582 if (!filter)
583 return AVERROR(EINVAL);
584
585 ret = av_mallocz(sizeof(AVFilterContext));
586
587 ret->av_class = &avfilter_class;
588 ret->filter = filter;
589 ret->name = inst_name ? av_strdup(inst_name) : NULL;
590 ret->priv = av_mallocz(filter->priv_size);
591
592 ret->input_count = pad_count(filter->inputs);
593 if (ret->input_count) {
594 ret->input_pads = av_malloc(sizeof(AVFilterPad) * ret->input_count);
595 memcpy(ret->input_pads, filter->inputs, sizeof(AVFilterPad) * ret->input_count);
596 ret->inputs = av_mallocz(sizeof(AVFilterLink*) * ret->input_count);
597 }
598
599 ret->output_count = pad_count(filter->outputs);
600 if (ret->output_count) {
601 ret->output_pads = av_malloc(sizeof(AVFilterPad) * ret->output_count);
602 memcpy(ret->output_pads, filter->outputs, sizeof(AVFilterPad) * ret->output_count);
603 ret->outputs = av_mallocz(sizeof(AVFilterLink*) * ret->output_count);
604 }
605
606 *filter_ctx = ret;
607 return 0;
608 }
609
610 void avfilter_free(AVFilterContext *filter)
611 {
612 int i;
613 AVFilterLink *link;
614
615 if (filter->filter->uninit)
616 filter->filter->uninit(filter);
617
618 for (i = 0; i < filter->input_count; i++) {
619 if ((link = filter->inputs[i])) {
620 if (link->src)
621 link->src->outputs[link->srcpad - link->src->output_pads] = NULL;
622 avfilter_formats_unref(&link->in_formats);
623 avfilter_formats_unref(&link->out_formats);
624 }
625 av_freep(&link);
626 }
627 for (i = 0; i < filter->output_count; i++) {
628 if ((link = filter->outputs[i])) {
629 if (link->dst)
630 link->dst->inputs[link->dstpad - link->dst->input_pads] = NULL;
631 avfilter_formats_unref(&link->in_formats);
632 avfilter_formats_unref(&link->out_formats);
633 }
634 av_freep(&link);
635 }
636
637 av_freep(&filter->name);
638 av_freep(&filter->input_pads);
639 av_freep(&filter->output_pads);
640 av_freep(&filter->inputs);
641 av_freep(&filter->outputs);
642 av_freep(&filter->priv);
643 av_free(filter);
644 }
645
646 int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque)
647 {
648 int ret=0;
649
650 if (filter->filter->init)
651 ret = filter->filter->init(filter, args, opaque);
652 return ret;
653 }
654