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ffmpeg / libavfilter / avfiltergraph.c @ 7b470878

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1
/*
2
 * Filter graphs
3
 * copyright (c) 2007 Bobby Bingham
4
 *
5
 * This file is part of FFmpeg.
6
 *
7
 * FFmpeg is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
9
 * License as published by the Free Software Foundation; either
10
 * version 2.1 of the License, or (at your option) any later version.
11
 *
12
 * FFmpeg is distributed in the hope that it will be useful,
13
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
 * Lesser General Public License for more details.
16
 *
17
 * You should have received a copy of the GNU Lesser General Public
18
 * License along with FFmpeg; if not, write to the Free Software
19
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20
 */
21

    
22
#include <string.h>
23
#include <stddef.h>
24

    
25
#include "avstring.h"
26
#include "avfilter.h"
27
#include "avfiltergraph.h"
28

    
29
#include "allfilters.h"
30

    
31
typedef struct AVFilterGraph {
32
    unsigned filter_count;
33
    AVFilterContext **filters;
34

    
35
    /** fake filter to handle links to internal filters */
36
    AVFilterContext *link_filter;
37
} GraphContext;
38

    
39
typedef struct {
40
    AVFilterContext *graph;
41
} GraphLinkContext;
42

    
43
static int link_init(AVFilterContext *ctx, const char *args, void *opaque)
44
{
45
    GraphLinkContext *linkctx = ctx->priv;
46
    linkctx->graph = opaque;
47
    return !opaque;
48
}
49

    
50
/**
51
 * Given the link between the dummy filter and an internal filter whose input
52
 * is being exported outside the graph, this returns the externally visible
53
 * link
54
 */
55
static inline AVFilterLink *get_extern_input_link(AVFilterLink *link)
56
{
57
    GraphLinkContext *lctx = link->src->priv;
58
    return lctx->graph->inputs[link->srcpad];
59
}
60

    
61
/** request a frame from a filter providing input to the graph */
62
static int link_in_request_frame(AVFilterLink *link)
63
{
64
    AVFilterLink *link2 = get_extern_input_link(link);
65

    
66
    if(!link2)
67
        return -1;
68
    return avfilter_request_frame(link2);
69
}
70

    
71
static int link_in_config_props(AVFilterLink *link)
72
{
73
    AVFilterLink *link2 = get_extern_input_link(link);
74
    int (*config_props)(AVFilterLink *);
75
    int ret;
76

    
77
    if(!link2)
78
        return -1;
79
    if(!(config_props = link2->src->output_pads[link2->srcpad].config_props))
80
        config_props = avfilter_default_config_output_link;
81
    ret = config_props(link2);
82

    
83
    link->w = link2->w;
84
    link->h = link2->h;
85

    
86
    return ret;
87
}
88

    
89
/**
90
 * Given the link between the dummy filter and an internal filter whose input
91
 * is being exported outside the graph, this returns the externally visible
92
 * link
93
 */
94
static inline AVFilterLink *get_extern_output_link(AVFilterLink *link)
95
{
96
    GraphLinkContext *lctx = link->dst->priv;
97
    return lctx->graph->outputs[link->dstpad];
98
}
99

    
100
static int link_out_config_props(AVFilterLink *link)
101
{
102
    AVFilterLink *link2 = get_extern_output_link(link);
103
    int (*config_props)(AVFilterLink *);
104

    
105
    if(!link2)
106
        return 0;
107

    
108
    link2->w = link->w;
109
    link2->h = link->h;
110

    
111
    if(!(config_props = link2->dst->input_pads[link2->dstpad].config_props))
112
        config_props = avfilter_default_config_input_link;
113
    return config_props(link2);
114
}
115

    
116
static void link_out_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
117
{
118
    AVFilterLink *link2 = get_extern_output_link(link);
119

    
120
    if(!link2)
121
        avfilter_unref_pic(picref);
122
    else
123
        avfilter_start_frame(link2, picref);
124
}
125

    
126
static void link_out_end_frame(AVFilterLink *link)
127
{
128
    AVFilterLink *link2 = get_extern_output_link(link);
129

    
130
    if(link2)
131
        avfilter_end_frame(link2);
132
}
133

    
134
static AVFilterPicRef *link_out_get_video_buffer(AVFilterLink *link, int perms)
135
{
136
    AVFilterLink *link2 = get_extern_output_link(link);
137

    
138
    if(!link2)
139
        return NULL;
140
    else
141
        return avfilter_get_video_buffer(link2, perms);
142
}
143

    
144
static void link_out_draw_slice(AVFilterLink *link, int y, int height)
145
{
146
    AVFilterLink *link2 = get_extern_output_link(link);
147

    
148
    if(link2)
149
        avfilter_draw_slice(link2, y, height);
150
}
151

    
152
/** dummy filter used to help export filters pads outside the graph */
153
static AVFilter vf_graph_dummy =
154
{
155
    .name      = "graph_dummy",
156
    .author    = "Bobby Bingham",
157

    
158
    .priv_size = sizeof(GraphLinkContext),
159

    
160
    .init      = link_init,
161

    
162
    .inputs    = (AVFilterPad[]) {{ .name = NULL, }},
163
    .outputs   = (AVFilterPad[]) {{ .name = NULL, }},
164
};
165

    
166
static AVFilterLink *get_intern_input_link(AVFilterLink *link)
167
{
168
    GraphContext *graph = link->dst->priv;
169
    return graph->link_filter->outputs[link->dstpad];
170
}
171

    
172
static void graph_in_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
173
{
174
    AVFilterLink *link2 = get_intern_input_link(link);
175
    if(link2)
176
        avfilter_start_frame(link2, picref);
177
}
178

    
179
static void graph_in_end_frame(AVFilterLink *link)
180
{
181
    AVFilterLink *link2 = get_intern_input_link(link);
182
    if(link2)
183
        avfilter_end_frame(link2);
184
}
185

    
186
static AVFilterPicRef *graph_in_get_video_buffer(AVFilterLink *link, int perms)
187
{
188
    AVFilterLink *link2 = get_intern_input_link(link);
189
    if(link2)
190
        return avfilter_get_video_buffer(link2, perms);
191
    return NULL;
192
}
193

    
194
static void graph_in_draw_slice(AVFilterLink *link, int y, int height)
195
{
196
    AVFilterLink *link2 = get_intern_input_link(link);
197
    if(link2)
198
        avfilter_draw_slice(link2, y, height);
199
}
200

    
201
static int graph_in_config_props(AVFilterLink *link)
202
{
203
    AVFilterLink *link2 = get_intern_input_link(link);
204
    int (*config_props)(AVFilterLink *);
205

    
206
    if(!link2)
207
        return -1;
208

    
209
    /* copy link properties over to the dummy internal link */
210
    link2->w = link->w;
211
    link2->h = link->h;
212
    link2->format = link->format;
213

    
214
    if(!(config_props = link2->dst->input_pads[link2->dstpad].config_props))
215
        return 0;   /* FIXME? */
216
        //config_props = avfilter_default_config_input_link;
217
    return config_props(link2);
218
}
219

    
220
static AVFilterLink *get_intern_output_link(AVFilterLink *link)
221
{
222
    GraphContext *graph = link->src->priv;
223
    return graph->link_filter->inputs[link->srcpad];
224
}
225

    
226
static int graph_out_request_frame(AVFilterLink *link)
227
{
228
    AVFilterLink *link2 = get_intern_output_link(link);
229

    
230
    if(link2)
231
        return avfilter_request_frame(link2);
232
    return -1;
233
}
234

    
235
static int graph_out_config_props(AVFilterLink *link)
236
{
237
    AVFilterLink *link2 = get_intern_output_link(link);
238
    int (*config_props)(AVFilterLink *);
239
    int ret;
240

    
241
    if(!link2)
242
        return 0;
243

    
244
    link2->w = link->w;
245
    link2->h = link->h;
246
    link2->format = link->format;
247

    
248
    if(!(config_props = link2->src->output_pads[link2->srcpad].config_props))
249
        config_props = avfilter_default_config_output_link;
250
    ret = config_props(link2);
251

    
252
    link->w = link2->w;
253
    link->h = link2->h;
254
    link->format = link2->format;
255

    
256
    return ret;
257
}
258

    
259
static int add_graph_input(AVFilterContext *gctx, AVFilterContext *filt, unsigned idx,
260
                           char *name)
261
{
262
    GraphContext *graph = gctx->priv;
263

    
264
    AVFilterPad graph_inpad =
265
    {
266
        .name             = name,
267
        .type             = AV_PAD_VIDEO,
268
        .start_frame      = graph_in_start_frame,
269
        .end_frame        = graph_in_end_frame,
270
        .get_video_buffer = graph_in_get_video_buffer,
271
        .draw_slice       = graph_in_draw_slice,
272
        .config_props     = graph_in_config_props,
273
        /* XXX */
274
    };
275
    AVFilterPad dummy_outpad =
276
    {
277
        .name          = NULL,          /* FIXME? */
278
        .type          = AV_PAD_VIDEO,
279
        .request_frame = link_in_request_frame,
280
        .config_props  = link_in_config_props,
281
    };
282

    
283
    avfilter_insert_inpad (gctx, gctx->input_count, &graph_inpad);
284
    avfilter_insert_outpad(graph->link_filter, graph->link_filter->output_count,
285
                           &dummy_outpad);
286
    return avfilter_link(graph->link_filter,
287
                         graph->link_filter->output_count-1, filt, idx);
288
}
289

    
290
static int add_graph_output(AVFilterContext *gctx, AVFilterContext *filt, unsigned idx,
291
                            char *name)
292
{
293
    GraphContext *graph = gctx->priv;
294

    
295
    AVFilterPad graph_outpad =
296
    {
297
        .name             = name,
298
        .type             = AV_PAD_VIDEO,
299
        .request_frame    = graph_out_request_frame,
300
        .config_props     = graph_out_config_props,
301
    };
302
    AVFilterPad dummy_inpad =
303
    {
304
        .name             = NULL,          /* FIXME? */
305
        .type             = AV_PAD_VIDEO,
306
        .start_frame      = link_out_start_frame,
307
        .end_frame        = link_out_end_frame,
308
        .draw_slice       = link_out_draw_slice,
309
        .get_video_buffer = link_out_get_video_buffer,
310
        .config_props     = link_out_config_props,
311
    };
312

    
313
    avfilter_insert_outpad(gctx, gctx->output_count, &graph_outpad);
314
    avfilter_insert_inpad (graph->link_filter, graph->link_filter->input_count,
315
                           &dummy_inpad);
316
    return avfilter_link(filt, idx, graph->link_filter,
317
                         graph->link_filter->input_count-1);
318
}
319

    
320
static void uninit(AVFilterContext *ctx)
321
{
322
    GraphContext *graph = ctx->priv;
323

    
324
    if(graph->link_filter) {
325
        avfilter_destroy(graph->link_filter);
326
        graph->link_filter = NULL;
327
    }
328
    for(; graph->filter_count > 0; graph->filter_count --)
329
        avfilter_destroy(graph->filters[graph->filter_count - 1]);
330
    av_freep(&graph->filters);
331
}
332

    
333
/* TODO: insert in sorted order */
334
void avfilter_graph_add_filter(AVFilterContext *graphctx, AVFilterContext *filter)
335
{
336
    GraphContext *graph = graphctx->priv;
337

    
338
    graph->filters = av_realloc(graph->filters,
339
                                sizeof(AVFilterContext*) * ++graph->filter_count);
340
    graph->filters[graph->filter_count - 1] = filter;
341
}
342

    
343
/* search intelligently, once we insert in order */
344
AVFilterContext *avfilter_graph_get_filter(AVFilterContext *ctx, char *name)
345
{
346
    GraphContext *graph = ctx->priv;
347
    int i;
348

    
349
    if(!name)
350
        return NULL;
351

    
352
    for(i = 0; i < graph->filter_count; i ++)
353
        if(graph->filters[i]->name && !strcmp(name, graph->filters[i]->name))
354
            return graph->filters[i];
355

    
356
    return NULL;
357
}
358

    
359
static int query_formats(AVFilterContext *graphctx)
360
{
361
    GraphContext *graph = graphctx->priv;
362
    AVFilterContext *linkfilt = graph->link_filter;
363
    int i, j;
364

    
365
    /* ask all the sub-filters for their supported colorspaces */
366
    for(i = 0; i < graph->filter_count; i ++) {
367
        if(graph->filters[i]->filter->query_formats)
368
            graph->filters[i]->filter->query_formats(graph->filters[i]);
369
        else
370
            avfilter_default_query_formats(graph->filters[i]);
371
    }
372

    
373
    /* use these formats on our exported links */
374
    for(i = 0; i < linkfilt->input_count; i ++) {
375
        avfilter_formats_ref( linkfilt->inputs[i]->in_formats,
376
                             &linkfilt->inputs[i]->out_formats);
377

    
378
        if(graphctx->outputs[i])
379
            avfilter_formats_ref( linkfilt-> inputs[i]->in_formats,
380
                                 &graphctx->outputs[i]->in_formats);
381
    }
382
    for(i = 0; i < linkfilt->output_count; i ++) {
383
        avfilter_formats_ref( linkfilt->outputs[i]->out_formats,
384
                             &linkfilt->outputs[i]->in_formats);
385

    
386
        if(graphctx->inputs[i])
387
            avfilter_formats_ref( linkfilt->outputs[i]->out_formats,
388
                                 &graphctx-> inputs[i]->out_formats);
389
    }
390

    
391
    /* go through and merge as many format lists as possible */
392
    for(i = 0; i < graph->filter_count; i ++) {
393
        AVFilterContext *filter = graph->filters[i];
394

    
395
        for(j = 0; j < filter->input_count; j ++) {
396
            AVFilterLink *link;
397
            if(!(link = filter->inputs[j]))
398
                continue;
399
            if(link->in_formats != link->out_formats) {
400
                if(!avfilter_merge_formats(link->in_formats,
401
                                           link->out_formats)) {
402
                    /* couldn't merge format lists. auto-insert scale filter */
403
                    AVFilterContext *scale;
404

    
405
                    if(!(scale = avfilter_open(&avfilter_vf_scale, NULL)))
406
                        return -1;
407
                    if(scale->filter->init(scale, NULL, NULL) ||
408
                       avfilter_insert_filter(link, scale, 0, 0)) {
409
                        avfilter_destroy(scale);
410
                        return -1;
411
                    }
412

    
413
                    avfilter_graph_add_filter(graphctx, scale);
414
                    scale->filter->query_formats(scale);
415
                    if(avfilter_merge_formats(scale-> inputs[0]->in_formats,
416
                                              scale-> inputs[0]->out_formats) ||
417
                       avfilter_merge_formats(scale->outputs[0]->in_formats,
418
                                              scale->outputs[0]->out_formats))
419
                        return -1;
420
                }
421
            }
422
        }
423
    }
424

    
425
    return 0;
426
}
427

    
428
static void pick_format(AVFilterLink *link)
429
{
430
    if(!link || !link->in_formats)
431
        return;
432

    
433
    link->in_formats->format_count = 1;
434
    link->format = link->in_formats->formats[0];
435

    
436
    avfilter_formats_unref(&link->in_formats);
437
    avfilter_formats_unref(&link->out_formats);
438
}
439

    
440
static void pick_formats(GraphContext *graph)
441
{
442
    int i, j;
443

    
444
    for(i = 0; i < graph->filter_count; i ++) {
445
        AVFilterContext *filter = graph->filters[i];
446

    
447
        if(filter->filter == &avfilter_vf_graph     ||
448
           filter->filter == &avfilter_vf_graphfile ||
449
           filter->filter == &avfilter_vf_graphdesc)
450
            pick_formats(filter->priv);
451

    
452
        for(j = 0; j < filter->input_count; j ++)
453
            pick_format(filter->inputs[j]);
454
        for(j = 0; j < filter->output_count; j ++)
455
            pick_format(filter->outputs[j]);
456
    }
457
}
458

    
459
int avfilter_graph_config_formats(AVFilterContext *graphctx)
460
{
461
    GraphContext *graph = graphctx->priv;
462

    
463
    /* Find supported formats from sub-filters, and merge along links */
464
    if(query_formats(graphctx))
465
        return -1;
466

    
467
    /* Once everything is merged, it's possible that we'll still have
468
     * multiple valid choices of colorspace. We pick the first one. */
469
    pick_formats(graph);
470

    
471
    return 0;
472
}
473

    
474
int avfilter_graph_config_links(AVFilterContext *graphctx)
475
{
476
    GraphContext *graph = graphctx->priv;
477
    int i, j;
478

    
479
    for(i = 0; i < graph->filter_count; i ++) {
480
        for(j = 0; j < graph->filters[i]->input_count; j ++) {
481
            /* ensure that graphs contained within graphs are configured */
482
            if((graph->filters[i]->filter == &avfilter_vf_graph     ||
483
                graph->filters[i]->filter == &avfilter_vf_graphfile ||
484
                graph->filters[i]->filter == &avfilter_vf_graphdesc) &&
485
                avfilter_graph_config_links(graph->filters[i]))
486
                return -1;
487
            if(avfilter_config_link(graph->filters[i]->inputs[j]))
488
                return -1;
489
        }
490
    }
491

    
492
    return 0;
493
}
494

    
495
static AVFilterContext *create_filter_with_args(const char *filt, void *opaque)
496
{
497
    AVFilterContext *ret;
498
    char *filter = av_strdup(filt); /* copy - don't mangle the input string */
499
    char *name, *args;
500

    
501
    name = filter;
502
    if((args = strchr(filter, '='))) {
503
        /* ensure we at least have a name */
504
        if(args == filter)
505
            goto fail;
506

    
507
        *args ++ = 0;
508
    }
509

    
510
    av_log(NULL, AV_LOG_INFO, "creating filter \"%s\" with args \"%s\"\n",
511
           name, args ? args : "(none)");
512

    
513
    if((ret = avfilter_open(avfilter_get_by_name(name), NULL))) {
514
        if(avfilter_init_filter(ret, args, opaque)) {
515
            av_log(NULL, AV_LOG_ERROR, "error initializing filter!\n");
516
            avfilter_destroy(ret);
517
            goto fail;
518
        }
519
    } else {
520
        av_log(NULL, AV_LOG_ERROR,
521
               "error creating filter \"%s\" with args \"%s\"\n",
522
               name, args ? args : "(none)");
523
    }
524

    
525
    av_free(filter);
526

    
527
    return ret;
528

    
529
fail:
530
    av_free(filter);
531
    return NULL;
532
}
533

    
534
static int graph_load_chain(AVFilterContext *graphctx,
535
                              unsigned count, char **filter_list, void **opaque,
536
                              AVFilterContext **first, AVFilterContext **last)
537
{
538
    unsigned i;
539
    AVFilterContext *filters[2] = {NULL,NULL};
540

    
541
    for(i = 0; i < count; i ++) {
542
        void *op;
543

    
544
        if(opaque) op = opaque[i];
545
        else       op = NULL;
546

    
547
        if(!(filters[1] = create_filter_with_args(filter_list[i], op)))
548
            goto fail;
549
        if(i == 0) {
550
            if(first) *first = filters[1];
551
        } else {
552
            if(avfilter_link(filters[0], 0, filters[1], 0)) {
553
                av_log(NULL, AV_LOG_ERROR, "error linking filters!\n");
554
                goto fail;
555
            }
556
        }
557
        avfilter_graph_add_filter(graphctx, filters[1]);
558
        if(i == 0 && filters[1]->input_count > 0)
559
            add_graph_input(graphctx, filters[1], 0, "default");
560
        filters[0] = filters[1];
561
    }
562

    
563
    if(filters[1]->output_count > 0)
564
        add_graph_output(graphctx, filters[1], 0, "default");
565

    
566
    if(last) *last = filters[1];
567
    return 0;
568

    
569
fail:
570
    uninit(graphctx);
571
    if(first) *first = NULL;
572
    if(last)  *last  = NULL;
573
    return -1;
574
}
575

    
576
static int graph_load_chain_from_string(AVFilterContext *ctx, const char *str,
577
                                        AVFilterContext **first,
578
                                        AVFilterContext **last)
579
{
580
    int count, ret = 0;
581
    char **strings;
582
    char *filt;
583

    
584
    strings    = av_malloc(sizeof(char *));
585
    strings[0] = av_strdup(str);
586

    
587
    filt = strchr(strings[0], ',');
588
    for(count = 1; filt; count ++) {
589
        if(filt == strings[count-1]) {
590
            ret = -1;
591
            goto done;
592
        }
593

    
594
        strings = av_realloc(strings, sizeof(char *) * (count+1));
595
        strings[count] = filt + 1;
596
        *filt = '\0';
597
        filt = strchr(strings[count], ',');
598
    }
599

    
600
    ret = graph_load_chain(ctx, count, strings, NULL, first, last);
601

    
602
done:
603
    av_free(strings[0]);
604
    av_free(strings);
605

    
606
    return ret;
607
}
608

    
609
static int init(AVFilterContext *ctx, const char *args, void *opaque)
610
{
611
    GraphContext *gctx = ctx->priv;
612

    
613
    if(!(gctx->link_filter = avfilter_open(&vf_graph_dummy, NULL)))
614
        return -1;
615
    if(avfilter_init_filter(gctx->link_filter, NULL, ctx))
616
        goto fail;
617

    
618
    if(!args)
619
        return 0;
620

    
621
    return graph_load_chain_from_string(ctx, args, NULL, NULL);
622

    
623
fail:
624
    avfilter_destroy(gctx->link_filter);
625
    return -1;
626
}
627

    
628
AVFilter avfilter_vf_graph =
629
{
630
    .name      = "graph",
631
    .author    = "Bobby Bingham",
632

    
633
    .priv_size = sizeof(GraphContext),
634

    
635
    .init      = init,
636
    .uninit    = uninit,
637

    
638
    .query_formats = query_formats,
639

    
640
    .inputs    = (AVFilterPad[]) {{ .name = NULL, }},
641
    .outputs   = (AVFilterPad[]) {{ .name = NULL, }},
642
};
643

    
644
static int graph_load_from_desc(AVFilterContext *ctx, AVFilterGraphDesc *desc)
645
{
646
    AVFilterGraphDescFilter *curfilt;
647
    AVFilterGraphDescLink   *curlink;
648
    AVFilterGraphDescExport *curpad;
649
    AVFilterContext *filt, *filtb;
650

    
651
    AVFilter *filterdef;
652

    
653
    /* create all filters */
654
    for(curfilt = desc->filters; curfilt; curfilt = curfilt->next) {
655
        if(!(filterdef = avfilter_get_by_name(curfilt->filter)) ||
656
           !(filt = avfilter_open(filterdef, curfilt->name))) {
657
            av_log(ctx, AV_LOG_ERROR, "error creating filter\n");
658
            goto fail;
659
        }
660
        avfilter_graph_add_filter(ctx, filt);
661
        if(avfilter_init_filter(filt, curfilt->args, NULL)) {
662
            av_log(ctx, AV_LOG_ERROR, "error initializing filter\n");
663
            goto fail;
664
        }
665
    }
666

    
667
    /* create all links */
668
    for(curlink = desc->links; curlink; curlink = curlink->next) {
669
        if(!(filt = avfilter_graph_get_filter(ctx, curlink->src))) {
670
            av_log(ctx, AV_LOG_ERROR, "link source does not exist in graph\n");
671
            goto fail;
672
        }
673
        if(!(filtb = avfilter_graph_get_filter(ctx, curlink->dst))) {
674
            av_log(ctx, AV_LOG_ERROR, "link destination does not exist in graph\n");
675
            goto fail;
676
        }
677
        if(avfilter_link(filt, curlink->srcpad, filtb, curlink->dstpad)) {
678
            av_log(ctx, AV_LOG_ERROR, "cannot create link between source and destination filters\n");
679
            goto fail;
680
        }
681
    }
682

    
683
    /* export all input pads */
684
    for(curpad = desc->inputs; curpad; curpad = curpad->next) {
685
        if(!(filt = avfilter_graph_get_filter(ctx, curpad->filter))) {
686
            av_log(ctx, AV_LOG_ERROR, "filter owning exported pad does not exist\n");
687
            goto fail;
688
        }
689
        add_graph_input(ctx, filt, curpad->pad, curpad->name);
690
    }
691

    
692
    /* export all output pads */
693
    for(curpad = desc->outputs; curpad; curpad = curpad->next) {
694
        if(!(filt = avfilter_graph_get_filter(ctx, curpad->filter))) {
695
            av_log(ctx, AV_LOG_ERROR, "filter owning exported pad does not exist\n");
696
            goto fail;
697
        }
698
        add_graph_output(ctx, filt, curpad->pad, curpad->name);
699
    }
700

    
701
    return 0;
702

    
703
fail:
704
    uninit(ctx);
705
    return -1;
706
}
707

    
708
static int init_desc(AVFilterContext *ctx, const char *args, void *opaque)
709
{
710
    GraphContext *gctx = ctx->priv;
711

    
712
    if(!opaque)
713
        return -1;
714

    
715
    if(!(gctx->link_filter = avfilter_open(&vf_graph_dummy, NULL)))
716
        return -1;
717
    if(avfilter_init_filter(gctx->link_filter, NULL, ctx))
718
        goto fail;
719

    
720
    return graph_load_from_desc(ctx, opaque);
721

    
722
fail:
723
    avfilter_destroy(gctx->link_filter);
724
    return -1;
725
}
726

    
727
AVFilter avfilter_vf_graphdesc =
728
{
729
    .name      = "graph_desc",
730
    .author    = "Bobby Bingham",
731

    
732
    .priv_size = sizeof(GraphContext),
733

    
734
    .init      = init_desc,
735
    .uninit    = uninit,
736

    
737
    .query_formats = query_formats,
738

    
739
    .inputs    = (AVFilterPad[]) {{ .name = NULL, }},
740
    .outputs   = (AVFilterPad[]) {{ .name = NULL, }},
741
};
742

    
743
static int init_file(AVFilterContext *ctx, const char *args, void *opaque)
744
{
745
    AVFilterGraphDesc *desc;
746
    int ret;
747

    
748
    if(!args)
749
        return -1;
750
    if(!(desc = avfilter_graph_load_desc(args)))
751
        return -1;
752

    
753
    ret = init_desc(ctx, NULL, desc);
754
    avfilter_graph_free_desc(desc);
755
    return ret;
756
}
757

    
758
AVFilter avfilter_vf_graphfile =
759
{
760
    .name      = "graph_file",
761
    .author    = "Bobby Bingham",
762

    
763
    .priv_size = sizeof(GraphContext),
764

    
765
    .init      = init_file,
766
    .uninit    = uninit,
767

    
768
    .query_formats = query_formats,
769

    
770
    .inputs    = (AVFilterPad[]) {{ .name = NULL, }},
771
    .outputs   = (AVFilterPad[]) {{ .name = NULL, }},
772
};
773