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ffmpeg / libavfilter / avfilter.c @ 24de0edb

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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
 *
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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
14
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
 * Lesser General Public License for more details.
16
 *
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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 "libavutil/pixdesc.h"
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#include "libavutil/rational.h"
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#include "libavcore/imgutils.h"
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#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;
43
}
44

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

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

    
80
void avfilter_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
81
                         AVFilterPad **pads, AVFilterLink ***links,
82
                         AVFilterPad *newpad)
83
{
84
    unsigned i;
85

    
86
    idx = FFMIN(idx, *count);
87

    
88
    *pads  = av_realloc(*pads,  sizeof(AVFilterPad)   * (*count + 1));
89
    *links = av_realloc(*links, sizeof(AVFilterLink*) * (*count + 1));
90
    memmove(*pads +idx+1, *pads +idx, sizeof(AVFilterPad)   * (*count-idx));
91
    memmove(*links+idx+1, *links+idx, sizeof(AVFilterLink*) * (*count-idx));
92
    memcpy(*pads+idx, newpad, sizeof(AVFilterPad));
93
    (*links)[idx] = NULL;
94

    
95
    (*count)++;
96
    for (i = idx+1; i < *count; i++)
97
        if (*links[i])
98
            (*(unsigned *)((uint8_t *) *links[i] + padidx_off))++;
99
}
100

    
101
int avfilter_link(AVFilterContext *src, unsigned srcpad,
102
                  AVFilterContext *dst, unsigned dstpad)
103
{
104
    AVFilterLink *link;
105

    
106
    if (src->output_count <= srcpad || dst->input_count <= dstpad ||
107
        src->outputs[srcpad]        || dst->inputs[dstpad])
108
        return -1;
109

    
110
    src->outputs[srcpad] =
111
    dst-> inputs[dstpad] = link = av_mallocz(sizeof(AVFilterLink));
112

    
113
    link->src     = src;
114
    link->dst     = dst;
115
    link->srcpad  = &src->output_pads[srcpad];
116
    link->dstpad  = &dst->input_pads[dstpad];
117
    link->type    = src->output_pads[srcpad].type;
118
    assert(PIX_FMT_NONE == -1 && SAMPLE_FMT_NONE == -1);
119
    link->format  = -1;
120

    
121
    return 0;
122
}
123

    
124
int avfilter_insert_filter(AVFilterLink *link, AVFilterContext *filt,
125
                           unsigned filt_srcpad_idx, unsigned filt_dstpad_idx)
126
{
127
    int ret;
128
    unsigned dstpad_idx = link->dstpad - link->dst->input_pads;
129

    
130
    av_log(link->dst, AV_LOG_INFO, "auto-inserting filter '%s' "
131
           "between the filter '%s' and the filter '%s'\n",
132
           filt->name, link->src->name, link->dst->name);
133

    
134
    link->dst->inputs[dstpad_idx] = NULL;
135
    if ((ret = avfilter_link(filt, filt_dstpad_idx, link->dst, dstpad_idx)) < 0) {
136
        /* failed to link output filter to new filter */
137
        link->dst->inputs[dstpad_idx] = link;
138
        return ret;
139
    }
140

    
141
    /* re-hookup the link to the new destination filter we inserted */
142
    link->dst = filt;
143
    link->dstpad = &filt->input_pads[filt_srcpad_idx];
144
    filt->inputs[filt_srcpad_idx] = link;
145

    
146
    /* if any information on supported media formats already exists on the
147
     * link, we need to preserve that */
148
    if (link->out_formats)
149
        avfilter_formats_changeref(&link->out_formats,
150
                                   &filt->outputs[filt_dstpad_idx]->out_formats);
151

    
152
    return 0;
153
}
154

    
155
int avfilter_config_links(AVFilterContext *filter)
156
{
157
    int (*config_link)(AVFilterLink *);
158
    unsigned i;
159
    int ret;
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 ((ret = avfilter_config_links(link->src)) < 0)
176
                return ret;
177

    
178
            if (!(config_link = link->srcpad->config_props))
179
                config_link  = avfilter_default_config_output_link;
180
            if ((ret = config_link(link)) < 0)
181
                return ret;
182

    
183
            if (link->time_base.num == 0 && link->time_base.den == 0)
184
                link->time_base = link->src && link->src->input_count ?
185
                    link->src->inputs[0]->time_base : AV_TIME_BASE_Q;
186

    
187
            if ((config_link = link->dstpad->config_props))
188
                if ((ret = config_link(link)) < 0)
189
                    return ret;
190

    
191
            link->init_state = AVLINK_INIT;
192
        }
193
    }
194

    
195
    return 0;
196
}
197

    
198
char *ff_get_ref_perms_string(char *buf, size_t buf_size, int perms)
199
{
200
    snprintf(buf, buf_size, "%s%s%s%s%s",
201
             perms & AV_PERM_READ      ? "r" : "",
202
             perms & AV_PERM_WRITE     ? "w" : "",
203
             perms & AV_PERM_PRESERVE  ? "p" : "",
204
             perms & AV_PERM_REUSE     ? "r" : "",
205
             perms & AV_PERM_REUSE2    ? "R" : "");
206
    return buf;
207
}
208

    
209
void ff_dprintf_ref(void *ctx, AVFilterBufferRef *ref, int end)
210
{
211
    av_unused char buf[16];
212
    dprintf(ctx,
213
            "ref[%p buf:%p refcount:%d perms:%s data:%p linesize[%d, %d, %d, %d] pts:%"PRId64" pos:%"PRId64,
214
            ref, ref->buf, ref->buf->refcount, ff_get_ref_perms_string(buf, sizeof(buf), ref->perms), ref->data[0],
215
            ref->linesize[0], ref->linesize[1], ref->linesize[2], ref->linesize[3],
216
            ref->pts, ref->pos);
217

    
218
    if (ref->video) {
219
        dprintf(ctx, " a:%d/%d s:%dx%d i:%c",
220
                ref->video->pixel_aspect.num, ref->video->pixel_aspect.den,
221
                ref->video->w, ref->video->h,
222
                !ref->video->interlaced     ? 'P' :         /* Progressive  */
223
                ref->video->top_field_first ? 'T' : 'B');   /* Top / Bottom */
224
    }
225
    if (ref->audio) {
226
        dprintf(ctx, " cl:%"PRId64"d sn:%d s:%d sr:%d p:%d",
227
                ref->audio->channel_layout,
228
                ref->audio->samples_nb,
229
                ref->audio->size,
230
                ref->audio->sample_rate,
231
                ref->audio->planar);
232
    }
233

    
234
    dprintf(ctx, "]%s", end ? "\n" : "");
235
}
236

    
237
void ff_dprintf_link(void *ctx, AVFilterLink *link, int end)
238
{
239
    dprintf(ctx,
240
            "link[%p s:%dx%d fmt:%-16s %-16s->%-16s]%s",
241
            link, link->w, link->h,
242
            av_pix_fmt_descriptors[link->format].name,
243
            link->src ? link->src->filter->name : "",
244
            link->dst ? link->dst->filter->name : "",
245
            end ? "\n" : "");
246
}
247

    
248
AVFilterBufferRef *avfilter_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
249
{
250
    AVFilterBufferRef *ret = NULL;
251

    
252
    av_unused char buf[16];
253
    FF_DPRINTF_START(NULL, get_video_buffer); ff_dprintf_link(NULL, link, 0);
254
    dprintf(NULL, " perms:%s w:%d h:%d\n", ff_get_ref_perms_string(buf, sizeof(buf), perms), w, h);
255

    
256
    if (link->dstpad->get_video_buffer)
257
        ret = link->dstpad->get_video_buffer(link, perms, w, h);
258

    
259
    if (!ret)
260
        ret = avfilter_default_get_video_buffer(link, perms, w, h);
261

    
262
    if (ret)
263
        ret->type = AVMEDIA_TYPE_VIDEO;
264

    
265
    FF_DPRINTF_START(NULL, get_video_buffer); ff_dprintf_link(NULL, link, 0); dprintf(NULL, " returning "); ff_dprintf_ref(NULL, ret, 1);
266

    
267
    return ret;
268
}
269

    
270
AVFilterBufferRef *avfilter_get_audio_buffer(AVFilterLink *link, int perms,
271
                                             enum SampleFormat sample_fmt, int size,
272
                                             int64_t channel_layout, int planar)
273
{
274
    AVFilterBufferRef *ret = NULL;
275

    
276
    if (link->dstpad->get_audio_buffer)
277
        ret = link->dstpad->get_audio_buffer(link, perms, sample_fmt, size, channel_layout, planar);
278

    
279
    if (!ret)
280
        ret = avfilter_default_get_audio_buffer(link, perms, sample_fmt, size, channel_layout, planar);
281

    
282
    if (ret)
283
        ret->type = AVMEDIA_TYPE_AUDIO;
284

    
285
    return ret;
286
}
287

    
288
int avfilter_request_frame(AVFilterLink *link)
289
{
290
    FF_DPRINTF_START(NULL, request_frame); ff_dprintf_link(NULL, link, 1);
291

    
292
    if (link->srcpad->request_frame)
293
        return link->srcpad->request_frame(link);
294
    else if (link->src->inputs[0])
295
        return avfilter_request_frame(link->src->inputs[0]);
296
    else return -1;
297
}
298

    
299
int avfilter_poll_frame(AVFilterLink *link)
300
{
301
    int i, min = INT_MAX;
302

    
303
    if (link->srcpad->poll_frame)
304
        return link->srcpad->poll_frame(link);
305

    
306
    for (i = 0; i < link->src->input_count; i++) {
307
        int val;
308
        if (!link->src->inputs[i])
309
            return -1;
310
        val = avfilter_poll_frame(link->src->inputs[i]);
311
        min = FFMIN(min, val);
312
    }
313

    
314
    return min;
315
}
316

    
317
/* XXX: should we do the duplicating of the picture ref here, instead of
318
 * forcing the source filter to do it? */
319
void avfilter_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
320
{
321
    void (*start_frame)(AVFilterLink *, AVFilterBufferRef *);
322
    AVFilterPad *dst = link->dstpad;
323

    
324
    FF_DPRINTF_START(NULL, start_frame); ff_dprintf_link(NULL, link, 0); dprintf(NULL, " "); ff_dprintf_ref(NULL, picref, 1);
325

    
326
    if (!(start_frame = dst->start_frame))
327
        start_frame = avfilter_default_start_frame;
328

    
329
    /* prepare to copy the picture if it has insufficient permissions */
330
    if ((dst->min_perms & picref->perms) != dst->min_perms ||
331
         dst->rej_perms & picref->perms) {
332
        av_log(link->dst, AV_LOG_DEBUG,
333
                "frame copy needed (have perms %x, need %x, reject %x)\n",
334
                picref->perms,
335
                link->dstpad->min_perms, link->dstpad->rej_perms);
336

    
337
        link->cur_buf = avfilter_get_video_buffer(link, dst->min_perms, link->w, link->h);
338
        link->src_buf = picref;
339
        avfilter_copy_buffer_ref_props(link->cur_buf, link->src_buf);
340
    }
341
    else
342
        link->cur_buf = picref;
343

    
344
    start_frame(link, link->cur_buf);
345
}
346

    
347
void avfilter_end_frame(AVFilterLink *link)
348
{
349
    void (*end_frame)(AVFilterLink *);
350

    
351
    if (!(end_frame = link->dstpad->end_frame))
352
        end_frame = avfilter_default_end_frame;
353

    
354
    end_frame(link);
355

    
356
    /* unreference the source picture if we're feeding the destination filter
357
     * a copied version dues to permission issues */
358
    if (link->src_buf) {
359
        avfilter_unref_buffer(link->src_buf);
360
        link->src_buf = NULL;
361
    }
362
}
363

    
364
void avfilter_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
365
{
366
    uint8_t *src[4], *dst[4];
367
    int i, j, vsub;
368
    void (*draw_slice)(AVFilterLink *, int, int, int);
369

    
370
    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);
371

    
372
    /* copy the slice if needed for permission reasons */
373
    if (link->src_buf) {
374
        vsub = av_pix_fmt_descriptors[link->format].log2_chroma_h;
375

    
376
        for (i = 0; i < 4; i++) {
377
            if (link->src_buf->data[i]) {
378
                src[i] = link->src_buf-> data[i] +
379
                    (y >> (i==0 ? 0 : vsub)) * link->src_buf-> linesize[i];
380
                dst[i] = link->cur_buf->data[i] +
381
                    (y >> (i==0 ? 0 : vsub)) * link->cur_buf->linesize[i];
382
            } else
383
                src[i] = dst[i] = NULL;
384
        }
385

    
386
        for (i = 0; i < 4; i++) {
387
            int planew =
388
                av_image_get_linesize(link->format, link->cur_buf->video->w, i);
389

    
390
            if (!src[i]) continue;
391

    
392
            for (j = 0; j < h >> (i==0 ? 0 : vsub); j++) {
393
                memcpy(dst[i], src[i], planew);
394
                src[i] += link->src_buf->linesize[i];
395
                dst[i] += link->cur_buf->linesize[i];
396
            }
397
        }
398
    }
399

    
400
    if (!(draw_slice = link->dstpad->draw_slice))
401
        draw_slice = avfilter_default_draw_slice;
402
    draw_slice(link, y, h, slice_dir);
403
}
404

    
405
void avfilter_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref)
406
{
407
    void (*filter_samples)(AVFilterLink *, AVFilterBufferRef *);
408
    AVFilterPad *dst = link->dstpad;
409

    
410
    if (!(filter_samples = dst->filter_samples))
411
        filter_samples = avfilter_default_filter_samples;
412

    
413
    /* prepare to copy the samples if the buffer has insufficient permissions */
414
    if ((dst->min_perms & samplesref->perms) != dst->min_perms ||
415
        dst->rej_perms & samplesref->perms) {
416

    
417
        av_log(link->dst, AV_LOG_DEBUG,
418
               "Copying audio data in avfilter (have perms %x, need %x, reject %x)\n",
419
               samplesref->perms, link->dstpad->min_perms, link->dstpad->rej_perms);
420

    
421
        link->cur_buf = avfilter_default_get_audio_buffer(link, dst->min_perms,
422
                                                          samplesref->format,
423
                                                          samplesref->audio->size,
424
                                                          samplesref->audio->channel_layout,
425
                                                          samplesref->audio->planar);
426
        link->cur_buf->pts                = samplesref->pts;
427
        link->cur_buf->audio->sample_rate = samplesref->audio->sample_rate;
428

    
429
        /* Copy actual data into new samples buffer */
430
        memcpy(link->cur_buf->data[0], samplesref->data[0], samplesref->audio->size);
431

    
432
        avfilter_unref_buffer(samplesref);
433
    } else
434
        link->cur_buf = samplesref;
435

    
436
    filter_samples(link, link->cur_buf);
437
}
438

    
439
#define MAX_REGISTERED_AVFILTERS_NB 64
440

    
441
static AVFilter *registered_avfilters[MAX_REGISTERED_AVFILTERS_NB + 1];
442

    
443
static int next_registered_avfilter_idx = 0;
444

    
445
AVFilter *avfilter_get_by_name(const char *name)
446
{
447
    int i;
448

    
449
    for (i = 0; registered_avfilters[i]; i++)
450
        if (!strcmp(registered_avfilters[i]->name, name))
451
            return registered_avfilters[i];
452

    
453
    return NULL;
454
}
455

    
456
int avfilter_register(AVFilter *filter)
457
{
458
    if (next_registered_avfilter_idx == MAX_REGISTERED_AVFILTERS_NB)
459
        return -1;
460

    
461
    registered_avfilters[next_registered_avfilter_idx++] = filter;
462
    return 0;
463
}
464

    
465
AVFilter **av_filter_next(AVFilter **filter)
466
{
467
    return filter ? ++filter : &registered_avfilters[0];
468
}
469

    
470
void avfilter_uninit(void)
471
{
472
    memset(registered_avfilters, 0, sizeof(registered_avfilters));
473
    next_registered_avfilter_idx = 0;
474
}
475

    
476
static int pad_count(const AVFilterPad *pads)
477
{
478
    int count;
479

    
480
    for(count = 0; pads->name; count ++) pads ++;
481
    return count;
482
}
483

    
484
static const char *filter_name(void *p)
485
{
486
    AVFilterContext *filter = p;
487
    return filter->filter->name;
488
}
489

    
490
static const AVClass avfilter_class = {
491
    "AVFilter",
492
    filter_name,
493
    NULL,
494
    LIBAVUTIL_VERSION_INT,
495
};
496

    
497
int avfilter_open(AVFilterContext **filter_ctx, AVFilter *filter, const char *inst_name)
498
{
499
    AVFilterContext *ret;
500
    *filter_ctx = NULL;
501

    
502
    if (!filter)
503
        return AVERROR(EINVAL);
504

    
505
    ret = av_mallocz(sizeof(AVFilterContext));
506

    
507
    ret->av_class = &avfilter_class;
508
    ret->filter   = filter;
509
    ret->name     = inst_name ? av_strdup(inst_name) : NULL;
510
    ret->priv     = av_mallocz(filter->priv_size);
511

    
512
    ret->input_count  = pad_count(filter->inputs);
513
    if (ret->input_count) {
514
        ret->input_pads   = av_malloc(sizeof(AVFilterPad) * ret->input_count);
515
        memcpy(ret->input_pads, filter->inputs, sizeof(AVFilterPad) * ret->input_count);
516
        ret->inputs       = av_mallocz(sizeof(AVFilterLink*) * ret->input_count);
517
    }
518

    
519
    ret->output_count = pad_count(filter->outputs);
520
    if (ret->output_count) {
521
        ret->output_pads  = av_malloc(sizeof(AVFilterPad) * ret->output_count);
522
        memcpy(ret->output_pads, filter->outputs, sizeof(AVFilterPad) * ret->output_count);
523
        ret->outputs      = av_mallocz(sizeof(AVFilterLink*) * ret->output_count);
524
    }
525

    
526
    *filter_ctx = ret;
527
    return 0;
528
}
529

    
530
void avfilter_free(AVFilterContext *filter)
531
{
532
    int i;
533
    AVFilterLink *link;
534

    
535
    if (filter->filter->uninit)
536
        filter->filter->uninit(filter);
537

    
538
    for (i = 0; i < filter->input_count; i++) {
539
        if ((link = filter->inputs[i])) {
540
            if (link->src)
541
                link->src->outputs[link->srcpad - link->src->output_pads] = NULL;
542
            avfilter_formats_unref(&link->in_formats);
543
            avfilter_formats_unref(&link->out_formats);
544
        }
545
        av_freep(&link);
546
    }
547
    for (i = 0; i < filter->output_count; i++) {
548
        if ((link = filter->outputs[i])) {
549
            if (link->dst)
550
                link->dst->inputs[link->dstpad - link->dst->input_pads] = NULL;
551
            avfilter_formats_unref(&link->in_formats);
552
            avfilter_formats_unref(&link->out_formats);
553
        }
554
        av_freep(&link);
555
    }
556

    
557
    av_freep(&filter->name);
558
    av_freep(&filter->input_pads);
559
    av_freep(&filter->output_pads);
560
    av_freep(&filter->inputs);
561
    av_freep(&filter->outputs);
562
    av_freep(&filter->priv);
563
    av_free(filter);
564
}
565

    
566
int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque)
567
{
568
    int ret=0;
569

    
570
    if (filter->filter->init)
571
        ret = filter->filter->init(filter, args, opaque);
572
    return ret;
573
}
574