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ffmpeg / libavfilter / avfilter.c @ 1d5b1885

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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
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 * 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 "libavcore/imgutils.h"
27
#include "avfilter.h"
28
#include "internal.h"
29

    
30
unsigned avfilter_version(void) {
31
    return LIBAVFILTER_VERSION_INT;
32
}
33

    
34
const char *avfilter_configuration(void)
35
{
36
    return FFMPEG_CONFIGURATION;
37
}
38

    
39
const char *avfilter_license(void)
40
{
41
#define LICENSE_PREFIX "libavfilter license: "
42
    return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
43
}
44

    
45
AVFilterBufferRef *avfilter_ref_buffer(AVFilterBufferRef *ref, int pmask)
46
{
47
    AVFilterBufferRef *ret = av_malloc(sizeof(AVFilterBufferRef));
48
    if (!ret)
49
        return NULL;
50
    *ret = *ref;
51
    if (ref->type == AVMEDIA_TYPE_VIDEO) {
52
        ret->video = av_malloc(sizeof(AVFilterBufferRefVideoProps));
53
        if (!ret->video) {
54
            av_free(ret);
55
            return NULL;
56
        }
57
        *ret->video = *ref->video;
58
    } else if (ref->type == AVMEDIA_TYPE_AUDIO) {
59
        ret->audio = av_malloc(sizeof(AVFilterBufferRefAudioProps));
60
        if (!ret->audio) {
61
            av_free(ret);
62
            return NULL;
63
        }
64
        *ret->audio = *ref->audio;
65
    }
66
    ret->perms &= pmask;
67
    ret->buf->refcount ++;
68
    return ret;
69
}
70

    
71
void avfilter_unref_buffer(AVFilterBufferRef *ref)
72
{
73
    if (!ref)
74
        return;
75
    if (!(--ref->buf->refcount))
76
        ref->buf->free(ref->buf);
77
    av_free(ref->video);
78
    av_free(ref->audio);
79
    av_free(ref);
80
}
81

    
82
void avfilter_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
83
                         AVFilterPad **pads, AVFilterLink ***links,
84
                         AVFilterPad *newpad)
85
{
86
    unsigned i;
87

    
88
    idx = FFMIN(idx, *count);
89

    
90
    *pads  = av_realloc(*pads,  sizeof(AVFilterPad)   * (*count + 1));
91
    *links = av_realloc(*links, sizeof(AVFilterLink*) * (*count + 1));
92
    memmove(*pads +idx+1, *pads +idx, sizeof(AVFilterPad)   * (*count-idx));
93
    memmove(*links+idx+1, *links+idx, sizeof(AVFilterLink*) * (*count-idx));
94
    memcpy(*pads+idx, newpad, sizeof(AVFilterPad));
95
    (*links)[idx] = NULL;
96

    
97
    (*count)++;
98
    for (i = idx+1; i < *count; i++)
99
        if (*links[i])
100
            (*(unsigned *)((uint8_t *) *links[i] + padidx_off))++;
101
}
102

    
103
int avfilter_link(AVFilterContext *src, unsigned srcpad,
104
                  AVFilterContext *dst, unsigned dstpad)
105
{
106
    AVFilterLink *link;
107

    
108
    if (src->output_count <= srcpad || dst->input_count <= dstpad ||
109
        src->outputs[srcpad]        || dst->inputs[dstpad])
110
        return -1;
111

    
112
    if (src->output_pads[srcpad].type != dst->input_pads[dstpad].type) {
113
        av_log(src, AV_LOG_ERROR,
114
               "Media type mismatch between the '%s' filter output pad %d and the '%s' filter input pad %d\n",
115
               src->name, srcpad, dst->name, dstpad);
116
        return AVERROR(EINVAL);
117
    }
118

    
119
    src->outputs[srcpad] =
120
    dst-> inputs[dstpad] = link = av_mallocz(sizeof(AVFilterLink));
121

    
122
    link->src     = src;
123
    link->dst     = dst;
124
    link->srcpad  = &src->output_pads[srcpad];
125
    link->dstpad  = &dst->input_pads[dstpad];
126
    link->type    = src->output_pads[srcpad].type;
127
    assert(PIX_FMT_NONE == -1 && AV_SAMPLE_FMT_NONE == -1);
128
    link->format  = -1;
129

    
130
    return 0;
131
}
132

    
133
int avfilter_insert_filter(AVFilterLink *link, AVFilterContext *filt,
134
                           unsigned filt_srcpad_idx, unsigned filt_dstpad_idx)
135
{
136
    int ret;
137
    unsigned dstpad_idx = link->dstpad - link->dst->input_pads;
138

    
139
    av_log(link->dst, AV_LOG_INFO, "auto-inserting filter '%s' "
140
           "between the filter '%s' and the filter '%s'\n",
141
           filt->name, link->src->name, link->dst->name);
142

    
143
    link->dst->inputs[dstpad_idx] = NULL;
144
    if ((ret = avfilter_link(filt, filt_dstpad_idx, link->dst, dstpad_idx)) < 0) {
145
        /* failed to link output filter to new filter */
146
        link->dst->inputs[dstpad_idx] = link;
147
        return ret;
148
    }
149

    
150
    /* re-hookup the link to the new destination filter we inserted */
151
    link->dst = filt;
152
    link->dstpad = &filt->input_pads[filt_srcpad_idx];
153
    filt->inputs[filt_srcpad_idx] = link;
154

    
155
    /* if any information on supported media formats already exists on the
156
     * link, we need to preserve that */
157
    if (link->out_formats)
158
        avfilter_formats_changeref(&link->out_formats,
159
                                   &filt->outputs[filt_dstpad_idx]->out_formats);
160

    
161
    return 0;
162
}
163

    
164
int avfilter_config_links(AVFilterContext *filter)
165
{
166
    int (*config_link)(AVFilterLink *);
167
    unsigned i;
168
    int ret;
169

    
170
    for (i = 0; i < filter->input_count; i ++) {
171
        AVFilterLink *link = filter->inputs[i];
172

    
173
        if (!link) continue;
174

    
175
        switch (link->init_state) {
176
        case AVLINK_INIT:
177
            continue;
178
        case AVLINK_STARTINIT:
179
            av_log(filter, AV_LOG_INFO, "circular filter chain detected\n");
180
            return 0;
181
        case AVLINK_UNINIT:
182
            link->init_state = AVLINK_STARTINIT;
183

    
184
            if ((ret = avfilter_config_links(link->src)) < 0)
185
                return ret;
186

    
187
            if (!(config_link = link->srcpad->config_props))
188
                config_link  = avfilter_default_config_output_link;
189
            if ((ret = config_link(link)) < 0)
190
                return ret;
191

    
192
            if (link->time_base.num == 0 && link->time_base.den == 0)
193
                link->time_base = link->src && link->src->input_count ?
194
                    link->src->inputs[0]->time_base : AV_TIME_BASE_Q;
195

    
196
            if ((config_link = link->dstpad->config_props))
197
                if ((ret = config_link(link)) < 0)
198
                    return ret;
199

    
200
            link->init_state = AVLINK_INIT;
201
        }
202
    }
203

    
204
    return 0;
205
}
206

    
207
char *ff_get_ref_perms_string(char *buf, size_t buf_size, int perms)
208
{
209
    snprintf(buf, buf_size, "%s%s%s%s%s%s",
210
             perms & AV_PERM_READ      ? "r" : "",
211
             perms & AV_PERM_WRITE     ? "w" : "",
212
             perms & AV_PERM_PRESERVE  ? "p" : "",
213
             perms & AV_PERM_REUSE     ? "u" : "",
214
             perms & AV_PERM_REUSE2    ? "U" : "",
215
             perms & AV_PERM_NEG_LINESIZES ? "n" : "");
216
    return buf;
217
}
218

    
219
void ff_dprintf_ref(void *ctx, AVFilterBufferRef *ref, int end)
220
{
221
    av_unused char buf[16];
222
    dprintf(ctx,
223
            "ref[%p buf:%p refcount:%d perms:%s data:%p linesize[%d, %d, %d, %d] pts:%"PRId64" pos:%"PRId64,
224
            ref, ref->buf, ref->buf->refcount, ff_get_ref_perms_string(buf, sizeof(buf), ref->perms), ref->data[0],
225
            ref->linesize[0], ref->linesize[1], ref->linesize[2], ref->linesize[3],
226
            ref->pts, ref->pos);
227

    
228
    if (ref->video) {
229
        dprintf(ctx, " a:%d/%d s:%dx%d i:%c",
230
                ref->video->pixel_aspect.num, ref->video->pixel_aspect.den,
231
                ref->video->w, ref->video->h,
232
                !ref->video->interlaced     ? 'P' :         /* Progressive  */
233
                ref->video->top_field_first ? 'T' : 'B');   /* Top / Bottom */
234
    }
235
    if (ref->audio) {
236
        dprintf(ctx, " cl:%"PRId64"d sn:%d s:%d sr:%d p:%d",
237
                ref->audio->channel_layout,
238
                ref->audio->nb_samples,
239
                ref->audio->size,
240
                ref->audio->sample_rate,
241
                ref->audio->planar);
242
    }
243

    
244
    dprintf(ctx, "]%s", end ? "\n" : "");
245
}
246

    
247
void ff_dprintf_link(void *ctx, AVFilterLink *link, int end)
248
{
249
    if (link->type == AVMEDIA_TYPE_VIDEO) {
250
        dprintf(ctx,
251
                "link[%p s:%dx%d fmt:%-16s %-16s->%-16s]%s",
252
                link, link->w, link->h,
253
                av_pix_fmt_descriptors[link->format].name,
254
                link->src ? link->src->filter->name : "",
255
                link->dst ? link->dst->filter->name : "",
256
                end ? "\n" : "");
257
    } else {
258
        char buf[128];
259
        av_get_channel_layout_string(buf, sizeof(buf), -1, link->channel_layout);
260

    
261
        dprintf(ctx,
262
                "link[%p r:%"PRId64" cl:%s fmt:%-16s %-16s->%-16s]%s",
263
                link, link->sample_rate, buf,
264
                av_get_sample_fmt_name(link->format),
265
                link->src ? link->src->filter->name : "",
266
                link->dst ? link->dst->filter->name : "",
267
                end ? "\n" : "");
268
    }
269
}
270

    
271
AVFilterBufferRef *avfilter_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
272
{
273
    AVFilterBufferRef *ret = NULL;
274

    
275
    av_unused char buf[16];
276
    FF_DPRINTF_START(NULL, get_video_buffer); ff_dprintf_link(NULL, link, 0);
277
    dprintf(NULL, " perms:%s w:%d h:%d\n", ff_get_ref_perms_string(buf, sizeof(buf), perms), w, h);
278

    
279
    if (link->dstpad->get_video_buffer)
280
        ret = link->dstpad->get_video_buffer(link, perms, w, h);
281

    
282
    if (!ret)
283
        ret = avfilter_default_get_video_buffer(link, perms, w, h);
284

    
285
    if (ret)
286
        ret->type = AVMEDIA_TYPE_VIDEO;
287

    
288
    FF_DPRINTF_START(NULL, get_video_buffer); ff_dprintf_link(NULL, link, 0); dprintf(NULL, " returning "); ff_dprintf_ref(NULL, ret, 1);
289

    
290
    return ret;
291
}
292

    
293
AVFilterBufferRef *
294
avfilter_get_video_buffer_ref_from_arrays(uint8_t *data[4], int linesize[4], int perms,
295
                                          int w, int h, enum PixelFormat format)
296
{
297
    AVFilterBuffer *pic = av_mallocz(sizeof(AVFilterBuffer));
298
    AVFilterBufferRef *picref = av_mallocz(sizeof(AVFilterBufferRef));
299

    
300
    if (!pic || !picref)
301
        goto fail;
302

    
303
    picref->buf = pic;
304
    picref->buf->free = ff_avfilter_default_free_buffer;
305
    if (!(picref->video = av_mallocz(sizeof(AVFilterBufferRefVideoProps))))
306
        goto fail;
307

    
308
    pic->w = picref->video->w = w;
309
    pic->h = picref->video->h = h;
310

    
311
    /* make sure the buffer gets read permission or it's useless for output */
312
    picref->perms = perms | AV_PERM_READ;
313

    
314
    pic->refcount = 1;
315
    picref->type = AVMEDIA_TYPE_VIDEO;
316
    pic->format = picref->format = format;
317

    
318
    memcpy(pic->data,        data,          sizeof(pic->data));
319
    memcpy(pic->linesize,    linesize,      sizeof(pic->linesize));
320
    memcpy(picref->data,     pic->data,     sizeof(picref->data));
321
    memcpy(picref->linesize, pic->linesize, sizeof(picref->linesize));
322

    
323
    return picref;
324

    
325
fail:
326
    if (picref && picref->video)
327
        av_free(picref->video);
328
    av_free(picref);
329
    av_free(pic);
330
    return NULL;
331
}
332

    
333
AVFilterBufferRef *avfilter_get_audio_buffer(AVFilterLink *link, int perms,
334
                                             enum AVSampleFormat sample_fmt, int size,
335
                                             int64_t channel_layout, int planar)
336
{
337
    AVFilterBufferRef *ret = NULL;
338

    
339
    if (link->dstpad->get_audio_buffer)
340
        ret = link->dstpad->get_audio_buffer(link, perms, sample_fmt, size, channel_layout, planar);
341

    
342
    if (!ret)
343
        ret = avfilter_default_get_audio_buffer(link, perms, sample_fmt, size, channel_layout, planar);
344

    
345
    if (ret)
346
        ret->type = AVMEDIA_TYPE_AUDIO;
347

    
348
    return ret;
349
}
350

    
351
int avfilter_request_frame(AVFilterLink *link)
352
{
353
    FF_DPRINTF_START(NULL, request_frame); ff_dprintf_link(NULL, link, 1);
354

    
355
    if (link->srcpad->request_frame)
356
        return link->srcpad->request_frame(link);
357
    else if (link->src->inputs[0])
358
        return avfilter_request_frame(link->src->inputs[0]);
359
    else return -1;
360
}
361

    
362
int avfilter_poll_frame(AVFilterLink *link)
363
{
364
    int i, min = INT_MAX;
365

    
366
    if (link->srcpad->poll_frame)
367
        return link->srcpad->poll_frame(link);
368

    
369
    for (i = 0; i < link->src->input_count; i++) {
370
        int val;
371
        if (!link->src->inputs[i])
372
            return -1;
373
        val = avfilter_poll_frame(link->src->inputs[i]);
374
        min = FFMIN(min, val);
375
    }
376

    
377
    return min;
378
}
379

    
380
/* XXX: should we do the duplicating of the picture ref here, instead of
381
 * forcing the source filter to do it? */
382
void avfilter_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
383
{
384
    void (*start_frame)(AVFilterLink *, AVFilterBufferRef *);
385
    AVFilterPad *dst = link->dstpad;
386
    int perms = picref->perms;
387

    
388
    FF_DPRINTF_START(NULL, start_frame); ff_dprintf_link(NULL, link, 0); dprintf(NULL, " "); ff_dprintf_ref(NULL, picref, 1);
389

    
390
    if (!(start_frame = dst->start_frame))
391
        start_frame = avfilter_default_start_frame;
392

    
393
    if (picref->linesize[0] < 0)
394
        perms |= AV_PERM_NEG_LINESIZES;
395
    /* prepare to copy the picture if it has insufficient permissions */
396
    if ((dst->min_perms & perms) != dst->min_perms || dst->rej_perms & perms) {
397
        av_log(link->dst, AV_LOG_DEBUG,
398
                "frame copy needed (have perms %x, need %x, reject %x)\n",
399
                picref->perms,
400
                link->dstpad->min_perms, link->dstpad->rej_perms);
401

    
402
        link->cur_buf = avfilter_get_video_buffer(link, dst->min_perms, link->w, link->h);
403
        link->src_buf = picref;
404
        avfilter_copy_buffer_ref_props(link->cur_buf, link->src_buf);
405
    }
406
    else
407
        link->cur_buf = picref;
408

    
409
    start_frame(link, link->cur_buf);
410
}
411

    
412
void avfilter_end_frame(AVFilterLink *link)
413
{
414
    void (*end_frame)(AVFilterLink *);
415

    
416
    if (!(end_frame = link->dstpad->end_frame))
417
        end_frame = avfilter_default_end_frame;
418

    
419
    end_frame(link);
420

    
421
    /* unreference the source picture if we're feeding the destination filter
422
     * a copied version dues to permission issues */
423
    if (link->src_buf) {
424
        avfilter_unref_buffer(link->src_buf);
425
        link->src_buf = NULL;
426
    }
427
}
428

    
429
void avfilter_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
430
{
431
    uint8_t *src[4], *dst[4];
432
    int i, j, vsub;
433
    void (*draw_slice)(AVFilterLink *, int, int, int);
434

    
435
    FF_DPRINTF_START(NULL, draw_slice); ff_dprintf_link(NULL, link, 0); dprintf(NULL, " y:%d h:%d dir:%d\n", y, h, slice_dir);
436

    
437
    /* copy the slice if needed for permission reasons */
438
    if (link->src_buf) {
439
        vsub = av_pix_fmt_descriptors[link->format].log2_chroma_h;
440

    
441
        for (i = 0; i < 4; i++) {
442
            if (link->src_buf->data[i]) {
443
                src[i] = link->src_buf-> data[i] +
444
                    (y >> (i==1 || i==2 ? vsub : 0)) * link->src_buf-> linesize[i];
445
                dst[i] = link->cur_buf->data[i] +
446
                    (y >> (i==1 || i==2 ? vsub : 0)) * link->cur_buf->linesize[i];
447
            } else
448
                src[i] = dst[i] = NULL;
449
        }
450

    
451
        for (i = 0; i < 4; i++) {
452
            int planew =
453
                av_image_get_linesize(link->format, link->cur_buf->video->w, i);
454

    
455
            if (!src[i]) continue;
456

    
457
            for (j = 0; j < h >> (i==1 || i==2 ? vsub : 0); j++) {
458
                memcpy(dst[i], src[i], planew);
459
                src[i] += link->src_buf->linesize[i];
460
                dst[i] += link->cur_buf->linesize[i];
461
            }
462
        }
463
    }
464

    
465
    if (!(draw_slice = link->dstpad->draw_slice))
466
        draw_slice = avfilter_default_draw_slice;
467
    draw_slice(link, y, h, slice_dir);
468
}
469

    
470
void avfilter_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref)
471
{
472
    void (*filter_samples)(AVFilterLink *, AVFilterBufferRef *);
473
    AVFilterPad *dst = link->dstpad;
474

    
475
    if (!(filter_samples = dst->filter_samples))
476
        filter_samples = avfilter_default_filter_samples;
477

    
478
    /* prepare to copy the samples if the buffer has insufficient permissions */
479
    if ((dst->min_perms & samplesref->perms) != dst->min_perms ||
480
        dst->rej_perms & samplesref->perms) {
481

    
482
        av_log(link->dst, AV_LOG_DEBUG,
483
               "Copying audio data in avfilter (have perms %x, need %x, reject %x)\n",
484
               samplesref->perms, link->dstpad->min_perms, link->dstpad->rej_perms);
485

    
486
        link->cur_buf = avfilter_default_get_audio_buffer(link, dst->min_perms,
487
                                                          samplesref->format,
488
                                                          samplesref->audio->size,
489
                                                          samplesref->audio->channel_layout,
490
                                                          samplesref->audio->planar);
491
        link->cur_buf->pts                = samplesref->pts;
492
        link->cur_buf->audio->sample_rate = samplesref->audio->sample_rate;
493

    
494
        /* Copy actual data into new samples buffer */
495
        memcpy(link->cur_buf->data[0], samplesref->data[0], samplesref->audio->size);
496

    
497
        avfilter_unref_buffer(samplesref);
498
    } else
499
        link->cur_buf = samplesref;
500

    
501
    filter_samples(link, link->cur_buf);
502
}
503

    
504
#define MAX_REGISTERED_AVFILTERS_NB 64
505

    
506
static AVFilter *registered_avfilters[MAX_REGISTERED_AVFILTERS_NB + 1];
507

    
508
static int next_registered_avfilter_idx = 0;
509

    
510
AVFilter *avfilter_get_by_name(const char *name)
511
{
512
    int i;
513

    
514
    for (i = 0; registered_avfilters[i]; i++)
515
        if (!strcmp(registered_avfilters[i]->name, name))
516
            return registered_avfilters[i];
517

    
518
    return NULL;
519
}
520

    
521
int avfilter_register(AVFilter *filter)
522
{
523
    if (next_registered_avfilter_idx == MAX_REGISTERED_AVFILTERS_NB)
524
        return -1;
525

    
526
    registered_avfilters[next_registered_avfilter_idx++] = filter;
527
    return 0;
528
}
529

    
530
AVFilter **av_filter_next(AVFilter **filter)
531
{
532
    return filter ? ++filter : &registered_avfilters[0];
533
}
534

    
535
void avfilter_uninit(void)
536
{
537
    memset(registered_avfilters, 0, sizeof(registered_avfilters));
538
    next_registered_avfilter_idx = 0;
539
}
540

    
541
static int pad_count(const AVFilterPad *pads)
542
{
543
    int count;
544

    
545
    for(count = 0; pads->name; count ++) pads ++;
546
    return count;
547
}
548

    
549
static const char *filter_name(void *p)
550
{
551
    AVFilterContext *filter = p;
552
    return filter->filter->name;
553
}
554

    
555
static const AVClass avfilter_class = {
556
    "AVFilter",
557
    filter_name,
558
    NULL,
559
    LIBAVUTIL_VERSION_INT,
560
};
561

    
562
int avfilter_open(AVFilterContext **filter_ctx, AVFilter *filter, const char *inst_name)
563
{
564
    AVFilterContext *ret;
565
    *filter_ctx = NULL;
566

    
567
    if (!filter)
568
        return AVERROR(EINVAL);
569

    
570
    ret = av_mallocz(sizeof(AVFilterContext));
571

    
572
    ret->av_class = &avfilter_class;
573
    ret->filter   = filter;
574
    ret->name     = inst_name ? av_strdup(inst_name) : NULL;
575
    ret->priv     = av_mallocz(filter->priv_size);
576

    
577
    ret->input_count  = pad_count(filter->inputs);
578
    if (ret->input_count) {
579
        ret->input_pads   = av_malloc(sizeof(AVFilterPad) * ret->input_count);
580
        memcpy(ret->input_pads, filter->inputs, sizeof(AVFilterPad) * ret->input_count);
581
        ret->inputs       = av_mallocz(sizeof(AVFilterLink*) * ret->input_count);
582
    }
583

    
584
    ret->output_count = pad_count(filter->outputs);
585
    if (ret->output_count) {
586
        ret->output_pads  = av_malloc(sizeof(AVFilterPad) * ret->output_count);
587
        memcpy(ret->output_pads, filter->outputs, sizeof(AVFilterPad) * ret->output_count);
588
        ret->outputs      = av_mallocz(sizeof(AVFilterLink*) * ret->output_count);
589
    }
590

    
591
    *filter_ctx = ret;
592
    return 0;
593
}
594

    
595
void avfilter_free(AVFilterContext *filter)
596
{
597
    int i;
598
    AVFilterLink *link;
599

    
600
    if (filter->filter->uninit)
601
        filter->filter->uninit(filter);
602

    
603
    for (i = 0; i < filter->input_count; i++) {
604
        if ((link = filter->inputs[i])) {
605
            if (link->src)
606
                link->src->outputs[link->srcpad - link->src->output_pads] = NULL;
607
            avfilter_formats_unref(&link->in_formats);
608
            avfilter_formats_unref(&link->out_formats);
609
        }
610
        av_freep(&link);
611
    }
612
    for (i = 0; i < filter->output_count; i++) {
613
        if ((link = filter->outputs[i])) {
614
            if (link->dst)
615
                link->dst->inputs[link->dstpad - link->dst->input_pads] = NULL;
616
            avfilter_formats_unref(&link->in_formats);
617
            avfilter_formats_unref(&link->out_formats);
618
        }
619
        av_freep(&link);
620
    }
621

    
622
    av_freep(&filter->name);
623
    av_freep(&filter->input_pads);
624
    av_freep(&filter->output_pads);
625
    av_freep(&filter->inputs);
626
    av_freep(&filter->outputs);
627
    av_freep(&filter->priv);
628
    av_free(filter);
629
}
630

    
631
int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque)
632
{
633
    int ret=0;
634

    
635
    if (filter->filter->init)
636
        ret = filter->filter->init(filter, args, opaque);
637
    return ret;
638
}
639