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ffmpeg / libavfilter / avfilter.c @ c34cb130

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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 "libavutil/audioconvert.h"
27
#include "libavutil/imgutils.h"
28
#include "libavutil/avassert.h"
29
#include "avfilter.h"
30
#include "internal.h"
31

    
32
unsigned avfilter_version(void) {
33
    return LIBAVFILTER_VERSION_INT;
34
}
35

    
36
const char *avfilter_configuration(void)
37
{
38
    return FFMPEG_CONFIGURATION;
39
}
40

    
41
const char *avfilter_license(void)
42
{
43
#define LICENSE_PREFIX "libavfilter license: "
44
    return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
45
}
46

    
47
AVFilterBufferRef *avfilter_ref_buffer(AVFilterBufferRef *ref, int pmask)
48
{
49
    AVFilterBufferRef *ret = av_malloc(sizeof(AVFilterBufferRef));
50
    if (!ret)
51
        return NULL;
52
    *ret = *ref;
53
    if (ref->type == AVMEDIA_TYPE_VIDEO) {
54
        ret->video = av_malloc(sizeof(AVFilterBufferRefVideoProps));
55
        if (!ret->video) {
56
            av_free(ret);
57
            return NULL;
58
        }
59
        *ret->video = *ref->video;
60
    } else if (ref->type == AVMEDIA_TYPE_AUDIO) {
61
        ret->audio = av_malloc(sizeof(AVFilterBufferRefAudioProps));
62
        if (!ret->audio) {
63
            av_free(ret);
64
            return NULL;
65
        }
66
        *ret->audio = *ref->audio;
67
    }
68
    ret->perms &= pmask;
69
    ret->buf->refcount ++;
70
    return ret;
71
}
72

    
73
static void store_in_pool(AVFilterBufferRef *ref)
74
{
75
    int i;
76
    AVFilterPool *pool= ref->buf->priv;
77

    
78
    av_assert0(ref->buf->data[0]);
79

    
80
    if(pool->count == POOL_SIZE){
81
        AVFilterBufferRef *ref1= pool->pic[0];
82
        av_freep(&ref1->video);
83
        av_freep(&ref1->audio);
84
        av_freep(&ref1->buf->data[0]);
85
        av_freep(&ref1->buf);
86
        av_free(ref1);
87
        memmove(&pool->pic[0], &pool->pic[1], sizeof(void*)*(POOL_SIZE-1));
88
        pool->count--;
89
        pool->pic[POOL_SIZE-1] = NULL;
90
    }
91

    
92
    for(i=0; i<POOL_SIZE; i++){
93
        if(!pool->pic[i]){
94
            pool->pic[i]= ref;
95
            pool->count++;
96
            break;
97
        }
98
    }
99
}
100

    
101
void avfilter_unref_buffer(AVFilterBufferRef *ref)
102
{
103
    if (!ref)
104
        return;
105
    if (!(--ref->buf->refcount)){
106
        if(!ref->buf->free){
107
            store_in_pool(ref);
108
            return;
109
        }
110
        ref->buf->free(ref->buf);
111
    }
112
    av_freep(&ref->video);
113
    av_freep(&ref->audio);
114
    av_free(ref);
115
}
116

    
117
void avfilter_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
118
                         AVFilterPad **pads, AVFilterLink ***links,
119
                         AVFilterPad *newpad)
120
{
121
    unsigned i;
122

    
123
    idx = FFMIN(idx, *count);
124

    
125
    *pads  = av_realloc(*pads,  sizeof(AVFilterPad)   * (*count + 1));
126
    *links = av_realloc(*links, sizeof(AVFilterLink*) * (*count + 1));
127
    memmove(*pads +idx+1, *pads +idx, sizeof(AVFilterPad)   * (*count-idx));
128
    memmove(*links+idx+1, *links+idx, sizeof(AVFilterLink*) * (*count-idx));
129
    memcpy(*pads+idx, newpad, sizeof(AVFilterPad));
130
    (*links)[idx] = NULL;
131

    
132
    (*count)++;
133
    for (i = idx+1; i < *count; i++)
134
        if (*links[i])
135
            (*(unsigned *)((uint8_t *) *links[i] + padidx_off))++;
136
}
137

    
138
int avfilter_link(AVFilterContext *src, unsigned srcpad,
139
                  AVFilterContext *dst, unsigned dstpad)
140
{
141
    AVFilterLink *link;
142

    
143
    if (src->output_count <= srcpad || dst->input_count <= dstpad ||
144
        src->outputs[srcpad]        || dst->inputs[dstpad])
145
        return -1;
146

    
147
    if (src->output_pads[srcpad].type != dst->input_pads[dstpad].type) {
148
        av_log(src, AV_LOG_ERROR,
149
               "Media type mismatch between the '%s' filter output pad %d and the '%s' filter input pad %d\n",
150
               src->name, srcpad, dst->name, dstpad);
151
        return AVERROR(EINVAL);
152
    }
153

    
154
    src->outputs[srcpad] =
155
    dst-> inputs[dstpad] = link = av_mallocz(sizeof(AVFilterLink));
156

    
157
    link->src     = src;
158
    link->dst     = dst;
159
    link->srcpad  = &src->output_pads[srcpad];
160
    link->dstpad  = &dst->input_pads[dstpad];
161
    link->type    = src->output_pads[srcpad].type;
162
    assert(PIX_FMT_NONE == -1 && AV_SAMPLE_FMT_NONE == -1);
163
    link->format  = -1;
164

    
165
    return 0;
166
}
167

    
168
int avfilter_insert_filter(AVFilterLink *link, AVFilterContext *filt,
169
                           unsigned filt_srcpad_idx, unsigned filt_dstpad_idx)
170
{
171
    int ret;
172
    unsigned dstpad_idx = link->dstpad - link->dst->input_pads;
173

    
174
    av_log(link->dst, AV_LOG_INFO, "auto-inserting filter '%s' "
175
           "between the filter '%s' and the filter '%s'\n",
176
           filt->name, link->src->name, link->dst->name);
177

    
178
    link->dst->inputs[dstpad_idx] = NULL;
179
    if ((ret = avfilter_link(filt, filt_dstpad_idx, link->dst, dstpad_idx)) < 0) {
180
        /* failed to link output filter to new filter */
181
        link->dst->inputs[dstpad_idx] = link;
182
        return ret;
183
    }
184

    
185
    /* re-hookup the link to the new destination filter we inserted */
186
    link->dst = filt;
187
    link->dstpad = &filt->input_pads[filt_srcpad_idx];
188
    filt->inputs[filt_srcpad_idx] = link;
189

    
190
    /* if any information on supported media formats already exists on the
191
     * link, we need to preserve that */
192
    if (link->out_formats)
193
        avfilter_formats_changeref(&link->out_formats,
194
                                   &filt->outputs[filt_dstpad_idx]->out_formats);
195

    
196
    return 0;
197
}
198

    
199
int avfilter_config_links(AVFilterContext *filter)
200
{
201
    int (*config_link)(AVFilterLink *);
202
    unsigned i;
203
    int ret;
204

    
205
    for (i = 0; i < filter->input_count; i ++) {
206
        AVFilterLink *link = filter->inputs[i];
207

    
208
        if (!link) continue;
209

    
210
        switch (link->init_state) {
211
        case AVLINK_INIT:
212
            continue;
213
        case AVLINK_STARTINIT:
214
            av_log(filter, AV_LOG_INFO, "circular filter chain detected\n");
215
            return 0;
216
        case AVLINK_UNINIT:
217
            link->init_state = AVLINK_STARTINIT;
218

    
219
            if ((ret = avfilter_config_links(link->src)) < 0)
220
                return ret;
221

    
222
            if (!(config_link = link->srcpad->config_props))
223
                config_link  = avfilter_default_config_output_link;
224
            if ((ret = config_link(link)) < 0)
225
                return ret;
226

    
227
            if (link->time_base.num == 0 && link->time_base.den == 0)
228
                link->time_base = link->src && link->src->input_count ?
229
                    link->src->inputs[0]->time_base : AV_TIME_BASE_Q;
230

    
231
            if (link->sample_aspect_ratio.num == 0 && link->sample_aspect_ratio.den == 0)
232
                link->sample_aspect_ratio = link->src->input_count ?
233
                    link->src->inputs[0]->sample_aspect_ratio : (AVRational){1,1};
234

    
235
            if (link->sample_rate == 0 && link->src && link->src->input_count)
236
                link->sample_rate = link->src->inputs[0]->sample_rate;
237

    
238
            if (link->channel_layout == 0 && link->src && link->src->input_count)
239
                link->channel_layout = link->src->inputs[0]->channel_layout;
240

    
241
            if ((config_link = link->dstpad->config_props))
242
                if ((ret = config_link(link)) < 0)
243
                    return ret;
244

    
245
            link->init_state = AVLINK_INIT;
246
        }
247
    }
248

    
249
    return 0;
250
}
251

    
252
static char *ff_get_ref_perms_string(char *buf, size_t buf_size, int perms)
253
{
254
    snprintf(buf, buf_size, "%s%s%s%s%s%s",
255
             perms & AV_PERM_READ      ? "r" : "",
256
             perms & AV_PERM_WRITE     ? "w" : "",
257
             perms & AV_PERM_PRESERVE  ? "p" : "",
258
             perms & AV_PERM_REUSE     ? "u" : "",
259
             perms & AV_PERM_REUSE2    ? "U" : "",
260
             perms & AV_PERM_NEG_LINESIZES ? "n" : "");
261
    return buf;
262
}
263

    
264
static void ff_dlog_ref(void *ctx, AVFilterBufferRef *ref, int end)
265
{
266
    av_unused char buf[16];
267
    av_dlog(ctx,
268
            "ref[%p buf:%p refcount:%d perms:%s data:%p linesize[%d, %d, %d, %d] pts:%"PRId64" pos:%"PRId64,
269
            ref, ref->buf, ref->buf->refcount, ff_get_ref_perms_string(buf, sizeof(buf), ref->perms), ref->data[0],
270
            ref->linesize[0], ref->linesize[1], ref->linesize[2], ref->linesize[3],
271
            ref->pts, ref->pos);
272

    
273
    if (ref->video) {
274
        av_dlog(ctx, " a:%d/%d s:%dx%d i:%c iskey:%d type:%c",
275
                ref->video->sample_aspect_ratio.num, ref->video->sample_aspect_ratio.den,
276
                ref->video->w, ref->video->h,
277
                !ref->video->interlaced     ? 'P' :         /* Progressive  */
278
                ref->video->top_field_first ? 'T' : 'B',    /* Top / Bottom */
279
                ref->video->key_frame,
280
                av_get_picture_type_char(ref->video->pict_type));
281
    }
282
    if (ref->audio) {
283
        av_dlog(ctx, " cl:%"PRId64"d sn:%d s:%d sr:%d p:%d",
284
                ref->audio->channel_layout,
285
                ref->audio->nb_samples,
286
                ref->audio->size,
287
                ref->audio->sample_rate,
288
                ref->audio->planar);
289
    }
290

    
291
    av_dlog(ctx, "]%s", end ? "\n" : "");
292
}
293

    
294
static void ff_dlog_link(void *ctx, AVFilterLink *link, int end)
295
{
296
    if (link->type == AVMEDIA_TYPE_VIDEO) {
297
        av_dlog(ctx,
298
                "link[%p s:%dx%d fmt:%-16s %-16s->%-16s]%s",
299
                link, link->w, link->h,
300
                av_pix_fmt_descriptors[link->format].name,
301
                link->src ? link->src->filter->name : "",
302
                link->dst ? link->dst->filter->name : "",
303
                end ? "\n" : "");
304
    } else {
305
        char buf[128];
306
        av_get_channel_layout_string(buf, sizeof(buf), -1, link->channel_layout);
307

    
308
        av_dlog(ctx,
309
                "link[%p r:%"PRId64" cl:%s fmt:%-16s %-16s->%-16s]%s",
310
                link, link->sample_rate, buf,
311
                av_get_sample_fmt_name(link->format),
312
                link->src ? link->src->filter->name : "",
313
                link->dst ? link->dst->filter->name : "",
314
                end ? "\n" : "");
315
    }
316
}
317

    
318
#define FF_DPRINTF_START(ctx, func) av_dlog(NULL, "%-16s: ", #func)
319

    
320
AVFilterBufferRef *avfilter_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
321
{
322
    AVFilterBufferRef *ret = NULL;
323

    
324
    av_unused char buf[16];
325
    FF_DPRINTF_START(NULL, get_video_buffer); ff_dlog_link(NULL, link, 0);
326
    av_dlog(NULL, " perms:%s w:%d h:%d\n", ff_get_ref_perms_string(buf, sizeof(buf), perms), w, h);
327

    
328
    if (link->dstpad->get_video_buffer)
329
        ret = link->dstpad->get_video_buffer(link, perms, w, h);
330

    
331
    if (!ret)
332
        ret = avfilter_default_get_video_buffer(link, perms, w, h);
333

    
334
    if (ret)
335
        ret->type = AVMEDIA_TYPE_VIDEO;
336

    
337
    FF_DPRINTF_START(NULL, get_video_buffer); ff_dlog_link(NULL, link, 0); av_dlog(NULL, " returning "); ff_dlog_ref(NULL, ret, 1);
338

    
339
    return ret;
340
}
341

    
342
AVFilterBufferRef *
343
avfilter_get_video_buffer_ref_from_arrays(uint8_t *data[4], int linesize[4], int perms,
344
                                          int w, int h, enum PixelFormat format)
345
{
346
    AVFilterBuffer *pic = av_mallocz(sizeof(AVFilterBuffer));
347
    AVFilterBufferRef *picref = av_mallocz(sizeof(AVFilterBufferRef));
348

    
349
    if (!pic || !picref)
350
        goto fail;
351

    
352
    picref->buf = pic;
353
    picref->buf->free = ff_avfilter_default_free_buffer;
354
    if (!(picref->video = av_mallocz(sizeof(AVFilterBufferRefVideoProps))))
355
        goto fail;
356

    
357
    pic->w = picref->video->w = w;
358
    pic->h = picref->video->h = h;
359

    
360
    /* make sure the buffer gets read permission or it's useless for output */
361
    picref->perms = perms | AV_PERM_READ;
362

    
363
    pic->refcount = 1;
364
    picref->type = AVMEDIA_TYPE_VIDEO;
365
    pic->format = picref->format = format;
366

    
367
    memcpy(pic->data,        data,          sizeof(pic->data));
368
    memcpy(pic->linesize,    linesize,      sizeof(pic->linesize));
369
    memcpy(picref->data,     pic->data,     sizeof(picref->data));
370
    memcpy(picref->linesize, pic->linesize, sizeof(picref->linesize));
371

    
372
    return picref;
373

    
374
fail:
375
    if (picref && picref->video)
376
        av_free(picref->video);
377
    av_free(picref);
378
    av_free(pic);
379
    return NULL;
380
}
381

    
382
AVFilterBufferRef *avfilter_get_audio_buffer(AVFilterLink *link, int perms,
383
                                             enum AVSampleFormat sample_fmt, int size,
384
                                             int64_t channel_layout, int planar)
385
{
386
    AVFilterBufferRef *ret = NULL;
387

    
388
    if (link->dstpad->get_audio_buffer)
389
        ret = link->dstpad->get_audio_buffer(link, perms, sample_fmt, size, channel_layout, planar);
390

    
391
    if (!ret)
392
        ret = avfilter_default_get_audio_buffer(link, perms, sample_fmt, size, channel_layout, planar);
393

    
394
    if (ret)
395
        ret->type = AVMEDIA_TYPE_AUDIO;
396

    
397
    return ret;
398
}
399

    
400
int avfilter_request_frame(AVFilterLink *link)
401
{
402
    FF_DPRINTF_START(NULL, request_frame); ff_dlog_link(NULL, link, 1);
403

    
404
    if (link->srcpad->request_frame)
405
        return link->srcpad->request_frame(link);
406
    else if (link->src->inputs[0])
407
        return avfilter_request_frame(link->src->inputs[0]);
408
    else return -1;
409
}
410

    
411
int avfilter_poll_frame(AVFilterLink *link)
412
{
413
    int i, min = INT_MAX;
414

    
415
    if (link->srcpad->poll_frame)
416
        return link->srcpad->poll_frame(link);
417

    
418
    for (i = 0; i < link->src->input_count; i++) {
419
        int val;
420
        if (!link->src->inputs[i])
421
            return -1;
422
        val = avfilter_poll_frame(link->src->inputs[i]);
423
        min = FFMIN(min, val);
424
    }
425

    
426
    return min;
427
}
428

    
429
/* XXX: should we do the duplicating of the picture ref here, instead of
430
 * forcing the source filter to do it? */
431
void avfilter_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
432
{
433
    void (*start_frame)(AVFilterLink *, AVFilterBufferRef *);
434
    AVFilterPad *dst = link->dstpad;
435
    int perms = picref->perms;
436

    
437
    FF_DPRINTF_START(NULL, start_frame); ff_dlog_link(NULL, link, 0); av_dlog(NULL, " "); ff_dlog_ref(NULL, picref, 1);
438

    
439
    if (!(start_frame = dst->start_frame))
440
        start_frame = avfilter_default_start_frame;
441

    
442
    if (picref->linesize[0] < 0)
443
        perms |= AV_PERM_NEG_LINESIZES;
444
    /* prepare to copy the picture if it has insufficient permissions */
445
    if ((dst->min_perms & perms) != dst->min_perms || dst->rej_perms & perms) {
446
        av_log(link->dst, AV_LOG_DEBUG,
447
                "frame copy needed (have perms %x, need %x, reject %x)\n",
448
                picref->perms,
449
                link->dstpad->min_perms, link->dstpad->rej_perms);
450

    
451
        link->cur_buf = avfilter_get_video_buffer(link, dst->min_perms, link->w, link->h);
452
        link->src_buf = picref;
453
        avfilter_copy_buffer_ref_props(link->cur_buf, link->src_buf);
454
    }
455
    else
456
        link->cur_buf = picref;
457

    
458
    start_frame(link, link->cur_buf);
459
}
460

    
461
void avfilter_end_frame(AVFilterLink *link)
462
{
463
    void (*end_frame)(AVFilterLink *);
464

    
465
    if (!(end_frame = link->dstpad->end_frame))
466
        end_frame = avfilter_default_end_frame;
467

    
468
    end_frame(link);
469

    
470
    /* unreference the source picture if we're feeding the destination filter
471
     * a copied version dues to permission issues */
472
    if (link->src_buf) {
473
        avfilter_unref_buffer(link->src_buf);
474
        link->src_buf = NULL;
475
    }
476
}
477

    
478
void avfilter_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
479
{
480
    uint8_t *src[4], *dst[4];
481
    int i, j, vsub;
482
    void (*draw_slice)(AVFilterLink *, int, int, int);
483

    
484
    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);
485

    
486
    /* copy the slice if needed for permission reasons */
487
    if (link->src_buf) {
488
        vsub = av_pix_fmt_descriptors[link->format].log2_chroma_h;
489

    
490
        for (i = 0; i < 4; i++) {
491
            if (link->src_buf->data[i]) {
492
                src[i] = link->src_buf-> data[i] +
493
                    (y >> (i==1 || i==2 ? vsub : 0)) * link->src_buf-> linesize[i];
494
                dst[i] = link->cur_buf->data[i] +
495
                    (y >> (i==1 || i==2 ? vsub : 0)) * link->cur_buf->linesize[i];
496
            } else
497
                src[i] = dst[i] = NULL;
498
        }
499

    
500
        for (i = 0; i < 4; i++) {
501
            int planew =
502
                av_image_get_linesize(link->format, link->cur_buf->video->w, i);
503

    
504
            if (!src[i]) continue;
505

    
506
            for (j = 0; j < h >> (i==1 || i==2 ? vsub : 0); j++) {
507
                memcpy(dst[i], src[i], planew);
508
                src[i] += link->src_buf->linesize[i];
509
                dst[i] += link->cur_buf->linesize[i];
510
            }
511
        }
512
    }
513

    
514
    if (!(draw_slice = link->dstpad->draw_slice))
515
        draw_slice = avfilter_default_draw_slice;
516
    draw_slice(link, y, h, slice_dir);
517
}
518

    
519
void avfilter_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref)
520
{
521
    void (*filter_samples)(AVFilterLink *, AVFilterBufferRef *);
522
    AVFilterPad *dst = link->dstpad;
523

    
524
    FF_DPRINTF_START(NULL, filter_samples); ff_dlog_link(NULL, link, 1);
525

    
526
    if (!(filter_samples = dst->filter_samples))
527
        filter_samples = avfilter_default_filter_samples;
528

    
529
    /* prepare to copy the samples if the buffer has insufficient permissions */
530
    if ((dst->min_perms & samplesref->perms) != dst->min_perms ||
531
        dst->rej_perms & samplesref->perms) {
532

    
533
        av_log(link->dst, AV_LOG_DEBUG,
534
               "Copying audio data in avfilter (have perms %x, need %x, reject %x)\n",
535
               samplesref->perms, link->dstpad->min_perms, link->dstpad->rej_perms);
536

    
537
        link->cur_buf = avfilter_default_get_audio_buffer(link, dst->min_perms,
538
                                                          samplesref->format,
539
                                                          samplesref->audio->size,
540
                                                          samplesref->audio->channel_layout,
541
                                                          samplesref->audio->planar);
542
        link->cur_buf->pts                = samplesref->pts;
543
        link->cur_buf->audio->sample_rate = samplesref->audio->sample_rate;
544

    
545
        /* Copy actual data into new samples buffer */
546
        memcpy(link->cur_buf->data[0], samplesref->data[0], samplesref->audio->size);
547

    
548
        avfilter_unref_buffer(samplesref);
549
    } else
550
        link->cur_buf = samplesref;
551

    
552
    filter_samples(link, link->cur_buf);
553
}
554

    
555
#define MAX_REGISTERED_AVFILTERS_NB 64
556

    
557
static AVFilter *registered_avfilters[MAX_REGISTERED_AVFILTERS_NB + 1];
558

    
559
static int next_registered_avfilter_idx = 0;
560

    
561
AVFilter *avfilter_get_by_name(const char *name)
562
{
563
    int i;
564

    
565
    for (i = 0; registered_avfilters[i]; i++)
566
        if (!strcmp(registered_avfilters[i]->name, name))
567
            return registered_avfilters[i];
568

    
569
    return NULL;
570
}
571

    
572
int avfilter_register(AVFilter *filter)
573
{
574
    if (next_registered_avfilter_idx == MAX_REGISTERED_AVFILTERS_NB)
575
        return -1;
576

    
577
    registered_avfilters[next_registered_avfilter_idx++] = filter;
578
    return 0;
579
}
580

    
581
AVFilter **av_filter_next(AVFilter **filter)
582
{
583
    return filter ? ++filter : &registered_avfilters[0];
584
}
585

    
586
void avfilter_uninit(void)
587
{
588
    memset(registered_avfilters, 0, sizeof(registered_avfilters));
589
    next_registered_avfilter_idx = 0;
590
}
591

    
592
static int pad_count(const AVFilterPad *pads)
593
{
594
    int count;
595

    
596
    for(count = 0; pads->name; count ++) pads ++;
597
    return count;
598
}
599

    
600
static const char *filter_name(void *p)
601
{
602
    AVFilterContext *filter = p;
603
    return filter->filter->name;
604
}
605

    
606
static const AVClass avfilter_class = {
607
    "AVFilter",
608
    filter_name,
609
    NULL,
610
    LIBAVUTIL_VERSION_INT,
611
};
612

    
613
int avfilter_open(AVFilterContext **filter_ctx, AVFilter *filter, const char *inst_name)
614
{
615
    AVFilterContext *ret;
616
    *filter_ctx = NULL;
617

    
618
    if (!filter)
619
        return AVERROR(EINVAL);
620

    
621
    ret = av_mallocz(sizeof(AVFilterContext));
622
    if (!ret)
623
        return AVERROR(ENOMEM);
624

    
625
    ret->av_class = &avfilter_class;
626
    ret->filter   = filter;
627
    ret->name     = inst_name ? av_strdup(inst_name) : NULL;
628
    if (filter->priv_size) {
629
        ret->priv     = av_mallocz(filter->priv_size);
630
        if (!ret->priv)
631
            goto err;
632
    }
633

    
634
    ret->input_count  = pad_count(filter->inputs);
635
    if (ret->input_count) {
636
        ret->input_pads   = av_malloc(sizeof(AVFilterPad) * ret->input_count);
637
        if (!ret->input_pads)
638
            goto err;
639
        memcpy(ret->input_pads, filter->inputs, sizeof(AVFilterPad) * ret->input_count);
640
        ret->inputs       = av_mallocz(sizeof(AVFilterLink*) * ret->input_count);
641
        if (!ret->inputs)
642
            goto err;
643
    }
644

    
645
    ret->output_count = pad_count(filter->outputs);
646
    if (ret->output_count) {
647
        ret->output_pads  = av_malloc(sizeof(AVFilterPad) * ret->output_count);
648
        if (!ret->output_pads)
649
            goto err;
650
        memcpy(ret->output_pads, filter->outputs, sizeof(AVFilterPad) * ret->output_count);
651
        ret->outputs      = av_mallocz(sizeof(AVFilterLink*) * ret->output_count);
652
        if (!ret->outputs)
653
            goto err;
654
    }
655

    
656
    *filter_ctx = ret;
657
    return 0;
658

    
659
err:
660
    av_freep(&ret->inputs);
661
    av_freep(&ret->input_pads);
662
    ret->input_count = 0;
663
    av_freep(&ret->outputs);
664
    av_freep(&ret->output_pads);
665
    ret->output_count = 0;
666
    av_freep(&ret->priv);
667
    av_free(ret);
668
    return AVERROR(ENOMEM);
669
}
670

    
671
void avfilter_free(AVFilterContext *filter)
672
{
673
    int i;
674
    AVFilterLink *link;
675

    
676
    if (filter->filter->uninit)
677
        filter->filter->uninit(filter);
678

    
679
    for (i = 0; i < filter->input_count; i++) {
680
        if ((link = filter->inputs[i])) {
681
            if (link->src)
682
                link->src->outputs[link->srcpad - link->src->output_pads] = NULL;
683
            avfilter_formats_unref(&link->in_formats);
684
            avfilter_formats_unref(&link->out_formats);
685
        }
686
        av_freep(&link);
687
    }
688
    for (i = 0; i < filter->output_count; i++) {
689
        if ((link = filter->outputs[i])) {
690
            if (link->dst)
691
                link->dst->inputs[link->dstpad - link->dst->input_pads] = NULL;
692
            avfilter_formats_unref(&link->in_formats);
693
            avfilter_formats_unref(&link->out_formats);
694
        }
695
        av_freep(&link);
696
    }
697

    
698
    av_freep(&filter->name);
699
    av_freep(&filter->input_pads);
700
    av_freep(&filter->output_pads);
701
    av_freep(&filter->inputs);
702
    av_freep(&filter->outputs);
703
    av_freep(&filter->priv);
704
    av_free(filter);
705
}
706

    
707
int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque)
708
{
709
    int ret=0;
710

    
711
    if (filter->filter->init)
712
        ret = filter->filter->init(filter, args, opaque);
713
    return ret;
714
}
715