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ffmpeg / libavfilter / avfilter.c @ b5fbb31e

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1
/*
2
 * filter layer
3
 * copyright (c) 2007 Bobby Bingham
4
 *
5
 * This file is part of FFmpeg.
6
 *
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 * FFmpeg is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
10
 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
13
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
 * Lesser General Public License for more details.
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 *
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 * 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
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
21

    
22
/* #define DEBUG */
23

    
24
#include "libavcodec/audioconvert.c"
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#include "libavutil/pixdesc.h"
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#include "libavcore/imgutils.h"
27
#include "avfilter.h"
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#include "internal.h"
29

    
30
unsigned avfilter_version(void) {
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    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: "
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    return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
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}
44

    
45
/** helper macros to get the in/out pad on the dst/src filter */
46
#define link_dpad(link)     link->dst-> input_pads[link->dstpad]
47
#define link_spad(link)     link->src->output_pads[link->srcpad]
48

    
49
AVFilterBufferRef *avfilter_ref_buffer(AVFilterBufferRef *ref, int pmask)
50
{
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    AVFilterBufferRef *ret = av_malloc(sizeof(AVFilterBufferRef));
52
    if (!ret)
53
        return NULL;
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    *ret = *ref;
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    if (ref->type == AVMEDIA_TYPE_VIDEO) {
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        ret->video = av_malloc(sizeof(AVFilterBufferRefVideoProps));
57
        if (!ret->video) {
58
            av_free(ret);
59
            return NULL;
60
        }
61
        *ret->video = *ref->video;
62
    } else if (ref->type == AVMEDIA_TYPE_AUDIO) {
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        ret->audio = av_malloc(sizeof(AVFilterBufferRefAudioProps));
64
        if (!ret->audio) {
65
            av_free(ret);
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            return NULL;
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        }
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        *ret->audio = *ref->audio;
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    }
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    ret->perms &= pmask;
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    ret->buf->refcount ++;
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    return ret;
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}
74

    
75
void avfilter_unref_buffer(AVFilterBufferRef *ref)
76
{
77
    if (!(--ref->buf->refcount))
78
        ref->buf->free(ref->buf);
79
    av_free(ref->video);
80
    av_free(ref->audio);
81
    av_free(ref);
82
}
83

    
84
void avfilter_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
85
                         AVFilterPad **pads, AVFilterLink ***links,
86
                         AVFilterPad *newpad)
87
{
88
    unsigned i;
89

    
90
    idx = FFMIN(idx, *count);
91

    
92
    *pads  = av_realloc(*pads,  sizeof(AVFilterPad)   * (*count + 1));
93
    *links = av_realloc(*links, sizeof(AVFilterLink*) * (*count + 1));
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    memmove(*pads +idx+1, *pads +idx, sizeof(AVFilterPad)   * (*count-idx));
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    memmove(*links+idx+1, *links+idx, sizeof(AVFilterLink*) * (*count-idx));
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    memcpy(*pads+idx, newpad, sizeof(AVFilterPad));
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    (*links)[idx] = NULL;
98

    
99
    (*count)++;
100
    for (i = idx+1; i < *count; i++)
101
        if (*links[i])
102
            (*(unsigned *)((uint8_t *) *links[i] + padidx_off))++;
103
}
104

    
105
int avfilter_link(AVFilterContext *src, unsigned srcpad,
106
                  AVFilterContext *dst, unsigned dstpad)
107
{
108
    AVFilterLink *link;
109

    
110
    if (src->output_count <= srcpad || dst->input_count <= dstpad ||
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        src->outputs[srcpad]        || dst->inputs[dstpad])
112
        return -1;
113

    
114
    src->outputs[srcpad] =
115
    dst-> inputs[dstpad] = link = av_mallocz(sizeof(AVFilterLink));
116

    
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    link->src     = src;
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    link->dst     = dst;
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    link->srcpad  = srcpad;
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    link->dstpad  = dstpad;
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    link->type    = src->output_pads[srcpad].type;
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    assert(PIX_FMT_NONE == -1 && SAMPLE_FMT_NONE == -1);
123
    link->format  = -1;
124

    
125
    return 0;
126
}
127

    
128
int avfilter_insert_filter(AVFilterLink *link, AVFilterContext *filt,
129
                           unsigned in, unsigned out)
130
{
131
    av_log(link->dst, AV_LOG_INFO, "auto-inserting filter '%s' "
132
           "between the filter '%s' and the filter '%s'\n",
133
           filt->name, link->src->name, link->dst->name);
134

    
135
    link->dst->inputs[link->dstpad] = NULL;
136
    if (avfilter_link(filt, out, link->dst, link->dstpad)) {
137
        /* failed to link output filter to new filter */
138
        link->dst->inputs[link->dstpad] = link;
139
        return -1;
140
    }
141

    
142
    /* re-hookup the link to the new destination filter we inserted */
143
    link->dst = filt;
144
    link->dstpad = in;
145
    filt->inputs[in] = link;
146

    
147
    /* if any information on supported media formats already exists on the
148
     * link, we need to preserve that */
149
    if (link->out_formats)
150
        avfilter_formats_changeref(&link->out_formats,
151
                                   &filt->outputs[out]->out_formats);
152

    
153
    return 0;
154
}
155

    
156
int avfilter_config_links(AVFilterContext *filter)
157
{
158
    int (*config_link)(AVFilterLink *);
159
    unsigned i;
160

    
161
    for (i = 0; i < filter->input_count; i ++) {
162
        AVFilterLink *link = filter->inputs[i];
163

    
164
        if (!link) continue;
165

    
166
        switch (link->init_state) {
167
        case AVLINK_INIT:
168
            continue;
169
        case AVLINK_STARTINIT:
170
            av_log(filter, AV_LOG_INFO, "circular filter chain detected\n");
171
            return 0;
172
        case AVLINK_UNINIT:
173
            link->init_state = AVLINK_STARTINIT;
174

    
175
            if (avfilter_config_links(link->src))
176
                return -1;
177

    
178
            if (!(config_link = link_spad(link).config_props))
179
                config_link  = avfilter_default_config_output_link;
180
            if (config_link(link))
181
                return -1;
182

    
183
            if ((config_link = link_dpad(link).config_props))
184
                if (config_link(link))
185
                    return -1;
186

    
187
            link->init_state = AVLINK_INIT;
188
        }
189
    }
190

    
191
    return 0;
192
}
193

    
194
void ff_dprintf_ref(void *ctx, AVFilterBufferRef *ref, int end)
195
{
196
    dprintf(ctx,
197
            "ref[%p data:%p linesize[%d, %d, %d, %d] pts:%"PRId64" pos:%"PRId64,
198
            ref,
199
            ref->data[0],
200
            ref->linesize[0], ref->linesize[1], ref->linesize[2], ref->linesize[3],
201
            ref->pts, ref->pos);
202

    
203
    if (ref->video) {
204
        dprintf(ctx, " a:%d/%d s:%dx%d i:%c",
205
                ref->video->pixel_aspect.num, ref->video->pixel_aspect.den,
206
                ref->video->w, ref->video->h,
207
                !ref->video->interlaced     ? 'P' :         /* Progressive  */
208
                ref->video->top_field_first ? 'T' : 'B');   /* Top / Bottom */
209
    }
210
    dprintf(ctx, "]%s", end ? "\n" : "");
211
}
212

    
213
void ff_dprintf_link(void *ctx, AVFilterLink *link, int end)
214
{
215
    dprintf(ctx,
216
            "link[%p s:%dx%d fmt:%-16s %-16s->%-16s]%s",
217
            link, link->w, link->h,
218
            av_pix_fmt_descriptors[link->format].name,
219
            link->src ? link->src->filter->name : "",
220
            link->dst ? link->dst->filter->name : "",
221
            end ? "\n" : "");
222
}
223

    
224
AVFilterBufferRef *avfilter_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
225
{
226
    AVFilterBufferRef *ret = NULL;
227

    
228
    FF_DPRINTF_START(NULL, get_video_buffer); ff_dprintf_link(NULL, link, 0); dprintf(NULL, " perms:%d w:%d h:%d\n", perms, w, h);
229

    
230
    if (link_dpad(link).get_video_buffer)
231
        ret = link_dpad(link).get_video_buffer(link, perms, w, h);
232

    
233
    if (!ret)
234
        ret = avfilter_default_get_video_buffer(link, perms, w, h);
235

    
236
    if (ret)
237
        ret->type = AVMEDIA_TYPE_VIDEO;
238

    
239
    FF_DPRINTF_START(NULL, get_video_buffer); ff_dprintf_link(NULL, link, 0); dprintf(NULL, " returning "); ff_dprintf_ref(NULL, ret, 1);
240

    
241
    return ret;
242
}
243

    
244
AVFilterBufferRef *avfilter_get_audio_buffer(AVFilterLink *link, int perms,
245
                                             enum SampleFormat sample_fmt, int size,
246
                                             int64_t channel_layout, int planar)
247
{
248
    AVFilterBufferRef *ret = NULL;
249

    
250
    if (link_dpad(link).get_audio_buffer)
251
        ret = link_dpad(link).get_audio_buffer(link, perms, sample_fmt, size, channel_layout, planar);
252

    
253
    if (!ret)
254
        ret = avfilter_default_get_audio_buffer(link, perms, sample_fmt, size, channel_layout, planar);
255

    
256
    if (ret)
257
        ret->type = AVMEDIA_TYPE_AUDIO;
258

    
259
    return ret;
260
}
261

    
262
int avfilter_request_frame(AVFilterLink *link)
263
{
264
    FF_DPRINTF_START(NULL, request_frame); ff_dprintf_link(NULL, link, 1);
265

    
266
    if (link_spad(link).request_frame)
267
        return link_spad(link).request_frame(link);
268
    else if (link->src->inputs[0])
269
        return avfilter_request_frame(link->src->inputs[0]);
270
    else return -1;
271
}
272

    
273
int avfilter_poll_frame(AVFilterLink *link)
274
{
275
    int i, min = INT_MAX;
276

    
277
    if (link_spad(link).poll_frame)
278
        return link_spad(link).poll_frame(link);
279

    
280
    for (i = 0; i < link->src->input_count; i++) {
281
        int val;
282
        if (!link->src->inputs[i])
283
            return -1;
284
        val = avfilter_poll_frame(link->src->inputs[i]);
285
        min = FFMIN(min, val);
286
    }
287

    
288
    return min;
289
}
290

    
291
/* XXX: should we do the duplicating of the picture ref here, instead of
292
 * forcing the source filter to do it? */
293
void avfilter_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
294
{
295
    void (*start_frame)(AVFilterLink *, AVFilterBufferRef *);
296
    AVFilterPad *dst = &link_dpad(link);
297

    
298
    FF_DPRINTF_START(NULL, start_frame); ff_dprintf_link(NULL, link, 0); dprintf(NULL, " "); ff_dprintf_ref(NULL, picref, 1);
299

    
300
    if (!(start_frame = dst->start_frame))
301
        start_frame = avfilter_default_start_frame;
302

    
303
    /* prepare to copy the picture if it has insufficient permissions */
304
    if ((dst->min_perms & picref->perms) != dst->min_perms ||
305
         dst->rej_perms & picref->perms) {
306
        av_log(link->dst, AV_LOG_DEBUG,
307
                "frame copy needed (have perms %x, need %x, reject %x)\n",
308
                picref->perms,
309
                link_dpad(link).min_perms, link_dpad(link).rej_perms);
310

    
311
        link->cur_buf = avfilter_default_get_video_buffer(link, dst->min_perms, link->w, link->h);
312
        link->src_buf = picref;
313
        avfilter_copy_buffer_ref_props(link->cur_buf, link->src_buf);
314
    }
315
    else
316
        link->cur_buf = picref;
317

    
318
    start_frame(link, link->cur_buf);
319
}
320

    
321
void avfilter_end_frame(AVFilterLink *link)
322
{
323
    void (*end_frame)(AVFilterLink *);
324

    
325
    if (!(end_frame = link_dpad(link).end_frame))
326
        end_frame = avfilter_default_end_frame;
327

    
328
    end_frame(link);
329

    
330
    /* unreference the source picture if we're feeding the destination filter
331
     * a copied version dues to permission issues */
332
    if (link->src_buf) {
333
        avfilter_unref_buffer(link->src_buf);
334
        link->src_buf = NULL;
335
    }
336
}
337

    
338
void avfilter_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
339
{
340
    uint8_t *src[4], *dst[4];
341
    int i, j, vsub;
342
    void (*draw_slice)(AVFilterLink *, int, int, int);
343

    
344
    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);
345

    
346
    /* copy the slice if needed for permission reasons */
347
    if (link->src_buf) {
348
        vsub = av_pix_fmt_descriptors[link->format].log2_chroma_h;
349

    
350
        for (i = 0; i < 4; i++) {
351
            if (link->src_buf->data[i]) {
352
                src[i] = link->src_buf-> data[i] +
353
                    (y >> (i==0 ? 0 : vsub)) * link->src_buf-> linesize[i];
354
                dst[i] = link->cur_buf->data[i] +
355
                    (y >> (i==0 ? 0 : vsub)) * link->cur_buf->linesize[i];
356
            } else
357
                src[i] = dst[i] = NULL;
358
        }
359

    
360
        for (i = 0; i < 4; i++) {
361
            int planew =
362
                av_get_image_linesize(link->format, link->cur_buf->video->w, i);
363

    
364
            if (!src[i]) continue;
365

    
366
            for (j = 0; j < h >> (i==0 ? 0 : vsub); j++) {
367
                memcpy(dst[i], src[i], planew);
368
                src[i] += link->src_buf->linesize[i];
369
                dst[i] += link->cur_buf->linesize[i];
370
            }
371
        }
372
    }
373

    
374
    if (!(draw_slice = link_dpad(link).draw_slice))
375
        draw_slice = avfilter_default_draw_slice;
376
    draw_slice(link, y, h, slice_dir);
377
}
378

    
379
void avfilter_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref)
380
{
381
    void (*filter_samples)(AVFilterLink *, AVFilterBufferRef *);
382
    AVFilterPad *dst = &link_dpad(link);
383

    
384
    if (!(filter_samples = dst->filter_samples))
385
        filter_samples = avfilter_default_filter_samples;
386

    
387
    /* prepare to copy the samples if the buffer has insufficient permissions */
388
    if ((dst->min_perms & samplesref->perms) != dst->min_perms ||
389
        dst->rej_perms & samplesref->perms) {
390

    
391
        av_log(link->dst, AV_LOG_DEBUG,
392
               "Copying audio data in avfilter (have perms %x, need %x, reject %x)\n",
393
               samplesref->perms, link_dpad(link).min_perms, link_dpad(link).rej_perms);
394

    
395
        link->cur_buf = avfilter_default_get_audio_buffer(link, dst->min_perms,
396
                                                          samplesref->format,
397
                                                          samplesref->audio->size,
398
                                                          samplesref->audio->channel_layout,
399
                                                          samplesref->audio->planar);
400
        link->cur_buf->pts                = samplesref->pts;
401
        link->cur_buf->audio->sample_rate = samplesref->audio->sample_rate;
402

    
403
        /* Copy actual data into new samples buffer */
404
        memcpy(link->cur_buf->data[0], samplesref->data[0], samplesref->audio->size);
405

    
406
        avfilter_unref_buffer(samplesref);
407
    } else
408
        link->cur_buf = samplesref;
409

    
410
    filter_samples(link, link->cur_buf);
411
}
412

    
413
#define MAX_REGISTERED_AVFILTERS_NB 64
414

    
415
static AVFilter *registered_avfilters[MAX_REGISTERED_AVFILTERS_NB + 1];
416

    
417
static int next_registered_avfilter_idx = 0;
418

    
419
AVFilter *avfilter_get_by_name(const char *name)
420
{
421
    int i;
422

    
423
    for (i = 0; registered_avfilters[i]; i++)
424
        if (!strcmp(registered_avfilters[i]->name, name))
425
            return registered_avfilters[i];
426

    
427
    return NULL;
428
}
429

    
430
int avfilter_register(AVFilter *filter)
431
{
432
    if (next_registered_avfilter_idx == MAX_REGISTERED_AVFILTERS_NB)
433
        return -1;
434

    
435
    registered_avfilters[next_registered_avfilter_idx++] = filter;
436
    return 0;
437
}
438

    
439
AVFilter **av_filter_next(AVFilter **filter)
440
{
441
    return filter ? ++filter : &registered_avfilters[0];
442
}
443

    
444
void avfilter_uninit(void)
445
{
446
    memset(registered_avfilters, 0, sizeof(registered_avfilters));
447
    next_registered_avfilter_idx = 0;
448
}
449

    
450
static int pad_count(const AVFilterPad *pads)
451
{
452
    int count;
453

    
454
    for(count = 0; pads->name; count ++) pads ++;
455
    return count;
456
}
457

    
458
static const char *filter_name(void *p)
459
{
460
    AVFilterContext *filter = p;
461
    return filter->filter->name;
462
}
463

    
464
static const AVClass avfilter_class = {
465
    "AVFilter",
466
    filter_name,
467
    NULL,
468
    LIBAVUTIL_VERSION_INT,
469
};
470

    
471
int avfilter_open(AVFilterContext **filter_ctx, AVFilter *filter, const char *inst_name)
472
{
473
    AVFilterContext *ret;
474
    *filter_ctx = NULL;
475

    
476
    if (!filter)
477
        return AVERROR(EINVAL);
478

    
479
    ret = av_mallocz(sizeof(AVFilterContext));
480

    
481
    ret->av_class = &avfilter_class;
482
    ret->filter   = filter;
483
    ret->name     = inst_name ? av_strdup(inst_name) : NULL;
484
    ret->priv     = av_mallocz(filter->priv_size);
485

    
486
    ret->input_count  = pad_count(filter->inputs);
487
    if (ret->input_count) {
488
        ret->input_pads   = av_malloc(sizeof(AVFilterPad) * ret->input_count);
489
        memcpy(ret->input_pads, filter->inputs, sizeof(AVFilterPad) * ret->input_count);
490
        ret->inputs       = av_mallocz(sizeof(AVFilterLink*) * ret->input_count);
491
    }
492

    
493
    ret->output_count = pad_count(filter->outputs);
494
    if (ret->output_count) {
495
        ret->output_pads  = av_malloc(sizeof(AVFilterPad) * ret->output_count);
496
        memcpy(ret->output_pads, filter->outputs, sizeof(AVFilterPad) * ret->output_count);
497
        ret->outputs      = av_mallocz(sizeof(AVFilterLink*) * ret->output_count);
498
    }
499

    
500
    *filter_ctx = ret;
501
    return 0;
502
}
503

    
504
void avfilter_destroy(AVFilterContext *filter)
505
{
506
    int i;
507

    
508
    if (filter->filter->uninit)
509
        filter->filter->uninit(filter);
510

    
511
    for (i = 0; i < filter->input_count; i++) {
512
        if (filter->inputs[i]) {
513
            if (filter->inputs[i]->src)
514
                filter->inputs[i]->src->outputs[filter->inputs[i]->srcpad] = NULL;
515
            avfilter_formats_unref(&filter->inputs[i]->in_formats);
516
            avfilter_formats_unref(&filter->inputs[i]->out_formats);
517
        }
518
        av_freep(&filter->inputs[i]);
519
    }
520
    for (i = 0; i < filter->output_count; i++) {
521
        if (filter->outputs[i]) {
522
            if (filter->outputs[i]->dst)
523
                filter->outputs[i]->dst->inputs[filter->outputs[i]->dstpad] = NULL;
524
            avfilter_formats_unref(&filter->outputs[i]->in_formats);
525
            avfilter_formats_unref(&filter->outputs[i]->out_formats);
526
        }
527
        av_freep(&filter->outputs[i]);
528
    }
529

    
530
    av_freep(&filter->name);
531
    av_freep(&filter->input_pads);
532
    av_freep(&filter->output_pads);
533
    av_freep(&filter->inputs);
534
    av_freep(&filter->outputs);
535
    av_freep(&filter->priv);
536
    av_free(filter);
537
}
538

    
539
int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque)
540
{
541
    int ret=0;
542

    
543
    if (filter->filter->init)
544
        ret = filter->filter->init(filter, args, opaque);
545
    return ret;
546
}
547