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1
/*
2
 * filter layer
3
 * Copyright (c) 2007 Bobby Bingham
4
 *
5
 * This file is part of Libav.
6
 *
7
 * Libav 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
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 * version 2.1 of the License, or (at your option) any later version.
11
 *
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 * Libav 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 Libav; if not, write to the Free Software
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 * 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 LIBAV_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