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ffmpeg / libavfilter / avfilter.c @ cf5fe8ec

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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
 *
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
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
21

    
22
/* #define DEBUG */
23

    
24
#include "libavcodec/audioconvert.c"
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#include "libavutil/pixdesc.h"
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#include "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"
30

    
31
unsigned avfilter_version(void) {
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    return LIBAVFILTER_VERSION_INT;
33
}
34

    
35
const char *avfilter_configuration(void)
36
{
37
    return FFMPEG_CONFIGURATION;
38
}
39

    
40
const char *avfilter_license(void)
41
{
42
#define LICENSE_PREFIX "libavfilter license: "
43
    return LICENSE_PREFIX FFMPEG_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;
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    *ret = *ref;
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    if (ref->type == AVMEDIA_TYPE_VIDEO) {
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        ret->video = av_malloc(sizeof(AVFilterBufferRefVideoProps));
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;
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    ret->buf->refcount ++;
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    return ret;
70
}
71

    
72
void avfilter_unref_buffer(AVFilterBufferRef *ref)
73
{
74
    if (!(--ref->buf->refcount))
75
        ref->buf->free(ref->buf);
76
    av_free(ref->video);
77
    av_free(ref->audio);
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    av_free(ref);
79
}
80

    
81
void avfilter_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
82
                         AVFilterPad **pads, AVFilterLink ***links,
83
                         AVFilterPad *newpad)
84
{
85
    unsigned i;
86

    
87
    idx = FFMIN(idx, *count);
88

    
89
    *pads  = av_realloc(*pads,  sizeof(AVFilterPad)   * (*count + 1));
90
    *links = av_realloc(*links, sizeof(AVFilterLink*) * (*count + 1));
91
    memmove(*pads +idx+1, *pads +idx, sizeof(AVFilterPad)   * (*count-idx));
92
    memmove(*links+idx+1, *links+idx, sizeof(AVFilterLink*) * (*count-idx));
93
    memcpy(*pads+idx, newpad, sizeof(AVFilterPad));
94
    (*links)[idx] = NULL;
95

    
96
    (*count)++;
97
    for (i = idx+1; i < *count; i++)
98
        if (*links[i])
99
            (*(unsigned *)((uint8_t *) *links[i] + padidx_off))++;
100
}
101

    
102
int avfilter_link(AVFilterContext *src, unsigned srcpad,
103
                  AVFilterContext *dst, unsigned dstpad)
104
{
105
    AVFilterLink *link;
106

    
107
    if (src->output_count <= srcpad || dst->input_count <= dstpad ||
108
        src->outputs[srcpad]        || dst->inputs[dstpad])
109
        return -1;
110

    
111
    src->outputs[srcpad] =
112
    dst-> inputs[dstpad] = link = av_mallocz(sizeof(AVFilterLink));
113

    
114
    link->src     = src;
115
    link->dst     = dst;
116
    link->srcpad  = &src->output_pads[srcpad];
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    link->dstpad  = &dst->input_pads[dstpad];
118
    link->type    = src->output_pads[srcpad].type;
119
    assert(PIX_FMT_NONE == -1 && SAMPLE_FMT_NONE == -1);
120
    link->format  = -1;
121

    
122
    return 0;
123
}
124

    
125
int avfilter_insert_filter(AVFilterLink *link, AVFilterContext *filt,
126
                           unsigned filt_srcpad_idx, unsigned filt_dstpad_idx)
127
{
128
    int ret;
129
    unsigned dstpad_idx = link->dstpad - link->dst->input_pads;
130

    
131
    av_log(link->dst, AV_LOG_INFO, "auto-inserting filter '%s' "
132
           "between the filter '%s' and the filter '%s'\n",
133
           filt->name, link->src->name, link->dst->name);
134

    
135
    link->dst->inputs[dstpad_idx] = NULL;
136
    if ((ret = avfilter_link(filt, filt_dstpad_idx, link->dst, dstpad_idx)) < 0) {
137
        /* failed to link output filter to new filter */
138
        link->dst->inputs[dstpad_idx] = link;
139
        return ret;
140
    }
141

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

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

    
153
    return 0;
154
}
155

    
156
int avfilter_config_links(AVFilterContext *filter)
157
{
158
    int (*config_link)(AVFilterLink *);
159
    unsigned i;
160
    int ret;
161

    
162
    for (i = 0; i < filter->input_count; i ++) {
163
        AVFilterLink *link = filter->inputs[i];
164

    
165
        if (!link) continue;
166

    
167
        switch (link->init_state) {
168
        case AVLINK_INIT:
169
            continue;
170
        case AVLINK_STARTINIT:
171
            av_log(filter, AV_LOG_INFO, "circular filter chain detected\n");
172
            return 0;
173
        case AVLINK_UNINIT:
174
            link->init_state = AVLINK_STARTINIT;
175

    
176
            if ((ret = avfilter_config_links(link->src)) < 0)
177
                return ret;
178

    
179
            if (!(config_link = link->srcpad->config_props))
180
                config_link  = avfilter_default_config_output_link;
181
            if ((ret = config_link(link)) < 0)
182
                return ret;
183

    
184
            if (link->time_base.num == 0 && link->time_base.den == 0)
185
                link->time_base = link->src && link->src->input_count ?
186
                    link->src->inputs[0]->time_base : AV_TIME_BASE_Q;
187

    
188
            if ((config_link = link->dstpad->config_props))
189
                if ((ret = config_link(link)) < 0)
190
                    return ret;
191

    
192
            link->init_state = AVLINK_INIT;
193
        }
194
    }
195

    
196
    return 0;
197
}
198

    
199
char *ff_get_ref_perms_string(char *buf, size_t buf_size, int perms)
200
{
201
    snprintf(buf, buf_size, "%s%s%s%s%s",
202
             perms & AV_PERM_READ      ? "r" : "",
203
             perms & AV_PERM_WRITE     ? "w" : "",
204
             perms & AV_PERM_PRESERVE  ? "p" : "",
205
             perms & AV_PERM_REUSE     ? "r" : "",
206
             perms & AV_PERM_REUSE2    ? "R" : "");
207
    return buf;
208
}
209

    
210
void ff_dprintf_ref(void *ctx, AVFilterBufferRef *ref, int end)
211
{
212
    av_unused char buf[16];
213
    dprintf(ctx,
214
            "ref[%p buf:%p refcount:%d perms:%s data:%p linesize[%d, %d, %d, %d] pts:%"PRId64" pos:%"PRId64,
215
            ref, ref->buf, ref->buf->refcount, ff_get_ref_perms_string(buf, sizeof(buf), ref->perms), ref->data[0],
216
            ref->linesize[0], ref->linesize[1], ref->linesize[2], ref->linesize[3],
217
            ref->pts, ref->pos);
218

    
219
    if (ref->video) {
220
        dprintf(ctx, " a:%d/%d s:%dx%d i:%c",
221
                ref->video->pixel_aspect.num, ref->video->pixel_aspect.den,
222
                ref->video->w, ref->video->h,
223
                !ref->video->interlaced     ? 'P' :         /* Progressive  */
224
                ref->video->top_field_first ? 'T' : 'B');   /* Top / Bottom */
225
    }
226
    if (ref->audio) {
227
        dprintf(ctx, " cl:%"PRId64"d sn:%d s:%d sr:%d p:%d",
228
                ref->audio->channel_layout,
229
                ref->audio->samples_nb,
230
                ref->audio->size,
231
                ref->audio->sample_rate,
232
                ref->audio->planar);
233
    }
234

    
235
    dprintf(ctx, "]%s", end ? "\n" : "");
236
}
237

    
238
void ff_dprintf_link(void *ctx, AVFilterLink *link, int end)
239
{
240
    dprintf(ctx,
241
            "link[%p s:%dx%d fmt:%-16s %-16s->%-16s]%s",
242
            link, link->w, link->h,
243
            av_pix_fmt_descriptors[link->format].name,
244
            link->src ? link->src->filter->name : "",
245
            link->dst ? link->dst->filter->name : "",
246
            end ? "\n" : "");
247
}
248

    
249
AVFilterBufferRef *avfilter_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
250
{
251
    AVFilterBufferRef *ret = NULL;
252

    
253
    av_unused char buf[16];
254
    FF_DPRINTF_START(NULL, get_video_buffer); ff_dprintf_link(NULL, link, 0);
255
    dprintf(NULL, " perms:%s w:%d h:%d\n", ff_get_ref_perms_string(buf, sizeof(buf), perms), w, h);
256

    
257
    if (link->dstpad->get_video_buffer)
258
        ret = link->dstpad->get_video_buffer(link, perms, w, h);
259

    
260
    if (!ret)
261
        ret = avfilter_default_get_video_buffer(link, perms, w, h);
262

    
263
    if (ret)
264
        ret->type = AVMEDIA_TYPE_VIDEO;
265

    
266
    FF_DPRINTF_START(NULL, get_video_buffer); ff_dprintf_link(NULL, link, 0); dprintf(NULL, " returning "); ff_dprintf_ref(NULL, ret, 1);
267

    
268
    return ret;
269
}
270

    
271
AVFilterBufferRef *avfilter_get_audio_buffer(AVFilterLink *link, int perms,
272
                                             enum SampleFormat sample_fmt, int size,
273
                                             int64_t channel_layout, int planar)
274
{
275
    AVFilterBufferRef *ret = NULL;
276

    
277
    if (link->dstpad->get_audio_buffer)
278
        ret = link->dstpad->get_audio_buffer(link, perms, sample_fmt, size, channel_layout, planar);
279

    
280
    if (!ret)
281
        ret = avfilter_default_get_audio_buffer(link, perms, sample_fmt, size, channel_layout, planar);
282

    
283
    if (ret)
284
        ret->type = AVMEDIA_TYPE_AUDIO;
285

    
286
    return ret;
287
}
288

    
289
int avfilter_request_frame(AVFilterLink *link)
290
{
291
    FF_DPRINTF_START(NULL, request_frame); ff_dprintf_link(NULL, link, 1);
292

    
293
    if (link->srcpad->request_frame)
294
        return link->srcpad->request_frame(link);
295
    else if (link->src->inputs[0])
296
        return avfilter_request_frame(link->src->inputs[0]);
297
    else return -1;
298
}
299

    
300
int avfilter_poll_frame(AVFilterLink *link)
301
{
302
    int i, min = INT_MAX;
303

    
304
    if (link->srcpad->poll_frame)
305
        return link->srcpad->poll_frame(link);
306

    
307
    for (i = 0; i < link->src->input_count; i++) {
308
        int val;
309
        if (!link->src->inputs[i])
310
            return -1;
311
        val = avfilter_poll_frame(link->src->inputs[i]);
312
        min = FFMIN(min, val);
313
    }
314

    
315
    return min;
316
}
317

    
318
/* XXX: should we do the duplicating of the picture ref here, instead of
319
 * forcing the source filter to do it? */
320
void avfilter_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
321
{
322
    void (*start_frame)(AVFilterLink *, AVFilterBufferRef *);
323
    AVFilterPad *dst = link->dstpad;
324

    
325
    FF_DPRINTF_START(NULL, start_frame); ff_dprintf_link(NULL, link, 0); dprintf(NULL, " "); ff_dprintf_ref(NULL, picref, 1);
326

    
327
    if (!(start_frame = dst->start_frame))
328
        start_frame = avfilter_default_start_frame;
329

    
330
    /* prepare to copy the picture if it has insufficient permissions */
331
    if ((dst->min_perms & picref->perms) != dst->min_perms ||
332
         dst->rej_perms & picref->perms) {
333
        av_log(link->dst, AV_LOG_DEBUG,
334
                "frame copy needed (have perms %x, need %x, reject %x)\n",
335
                picref->perms,
336
                link->dstpad->min_perms, link->dstpad->rej_perms);
337

    
338
        link->cur_buf = avfilter_get_video_buffer(link, dst->min_perms, link->w, link->h);
339
        link->src_buf = picref;
340
        avfilter_copy_buffer_ref_props(link->cur_buf, link->src_buf);
341
    }
342
    else
343
        link->cur_buf = picref;
344

    
345
    start_frame(link, link->cur_buf);
346
}
347

    
348
void avfilter_end_frame(AVFilterLink *link)
349
{
350
    void (*end_frame)(AVFilterLink *);
351

    
352
    if (!(end_frame = link->dstpad->end_frame))
353
        end_frame = avfilter_default_end_frame;
354

    
355
    end_frame(link);
356

    
357
    /* unreference the source picture if we're feeding the destination filter
358
     * a copied version dues to permission issues */
359
    if (link->src_buf) {
360
        avfilter_unref_buffer(link->src_buf);
361
        link->src_buf = NULL;
362
    }
363
}
364

    
365
void avfilter_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
366
{
367
    uint8_t *src[4], *dst[4];
368
    int i, j, vsub;
369
    void (*draw_slice)(AVFilterLink *, int, int, int);
370

    
371
    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);
372

    
373
    /* copy the slice if needed for permission reasons */
374
    if (link->src_buf) {
375
        vsub = av_pix_fmt_descriptors[link->format].log2_chroma_h;
376

    
377
        for (i = 0; i < 4; i++) {
378
            if (link->src_buf->data[i]) {
379
                src[i] = link->src_buf-> data[i] +
380
                    (y >> (i==0 ? 0 : vsub)) * link->src_buf-> linesize[i];
381
                dst[i] = link->cur_buf->data[i] +
382
                    (y >> (i==0 ? 0 : vsub)) * link->cur_buf->linesize[i];
383
            } else
384
                src[i] = dst[i] = NULL;
385
        }
386

    
387
        for (i = 0; i < 4; i++) {
388
            int planew =
389
                av_image_get_linesize(link->format, link->cur_buf->video->w, i);
390

    
391
            if (!src[i]) continue;
392

    
393
            for (j = 0; j < h >> (i==0 ? 0 : vsub); j++) {
394
                memcpy(dst[i], src[i], planew);
395
                src[i] += link->src_buf->linesize[i];
396
                dst[i] += link->cur_buf->linesize[i];
397
            }
398
        }
399
    }
400

    
401
    if (!(draw_slice = link->dstpad->draw_slice))
402
        draw_slice = avfilter_default_draw_slice;
403
    draw_slice(link, y, h, slice_dir);
404
}
405

    
406
void avfilter_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref)
407
{
408
    void (*filter_samples)(AVFilterLink *, AVFilterBufferRef *);
409
    AVFilterPad *dst = link->dstpad;
410

    
411
    if (!(filter_samples = dst->filter_samples))
412
        filter_samples = avfilter_default_filter_samples;
413

    
414
    /* prepare to copy the samples if the buffer has insufficient permissions */
415
    if ((dst->min_perms & samplesref->perms) != dst->min_perms ||
416
        dst->rej_perms & samplesref->perms) {
417

    
418
        av_log(link->dst, AV_LOG_DEBUG,
419
               "Copying audio data in avfilter (have perms %x, need %x, reject %x)\n",
420
               samplesref->perms, link->dstpad->min_perms, link->dstpad->rej_perms);
421

    
422
        link->cur_buf = avfilter_default_get_audio_buffer(link, dst->min_perms,
423
                                                          samplesref->format,
424
                                                          samplesref->audio->size,
425
                                                          samplesref->audio->channel_layout,
426
                                                          samplesref->audio->planar);
427
        link->cur_buf->pts                = samplesref->pts;
428
        link->cur_buf->audio->sample_rate = samplesref->audio->sample_rate;
429

    
430
        /* Copy actual data into new samples buffer */
431
        memcpy(link->cur_buf->data[0], samplesref->data[0], samplesref->audio->size);
432

    
433
        avfilter_unref_buffer(samplesref);
434
    } else
435
        link->cur_buf = samplesref;
436

    
437
    filter_samples(link, link->cur_buf);
438
}
439

    
440
#define MAX_REGISTERED_AVFILTERS_NB 64
441

    
442
static AVFilter *registered_avfilters[MAX_REGISTERED_AVFILTERS_NB + 1];
443

    
444
static int next_registered_avfilter_idx = 0;
445

    
446
AVFilter *avfilter_get_by_name(const char *name)
447
{
448
    int i;
449

    
450
    for (i = 0; registered_avfilters[i]; i++)
451
        if (!strcmp(registered_avfilters[i]->name, name))
452
            return registered_avfilters[i];
453

    
454
    return NULL;
455
}
456

    
457
int avfilter_register(AVFilter *filter)
458
{
459
    if (next_registered_avfilter_idx == MAX_REGISTERED_AVFILTERS_NB)
460
        return -1;
461

    
462
    registered_avfilters[next_registered_avfilter_idx++] = filter;
463
    return 0;
464
}
465

    
466
AVFilter **av_filter_next(AVFilter **filter)
467
{
468
    return filter ? ++filter : &registered_avfilters[0];
469
}
470

    
471
void avfilter_uninit(void)
472
{
473
    memset(registered_avfilters, 0, sizeof(registered_avfilters));
474
    next_registered_avfilter_idx = 0;
475
}
476

    
477
static int pad_count(const AVFilterPad *pads)
478
{
479
    int count;
480

    
481
    for(count = 0; pads->name; count ++) pads ++;
482
    return count;
483
}
484

    
485
static const char *filter_name(void *p)
486
{
487
    AVFilterContext *filter = p;
488
    return filter->filter->name;
489
}
490

    
491
static const AVClass avfilter_class = {
492
    "AVFilter",
493
    filter_name,
494
    NULL,
495
    LIBAVUTIL_VERSION_INT,
496
};
497

    
498
int avfilter_open(AVFilterContext **filter_ctx, AVFilter *filter, const char *inst_name)
499
{
500
    AVFilterContext *ret;
501
    *filter_ctx = NULL;
502

    
503
    if (!filter)
504
        return AVERROR(EINVAL);
505

    
506
    ret = av_mallocz(sizeof(AVFilterContext));
507

    
508
    ret->av_class = &avfilter_class;
509
    ret->filter   = filter;
510
    ret->name     = inst_name ? av_strdup(inst_name) : NULL;
511
    ret->priv     = av_mallocz(filter->priv_size);
512

    
513
    ret->input_count  = pad_count(filter->inputs);
514
    if (ret->input_count) {
515
        ret->input_pads   = av_malloc(sizeof(AVFilterPad) * ret->input_count);
516
        memcpy(ret->input_pads, filter->inputs, sizeof(AVFilterPad) * ret->input_count);
517
        ret->inputs       = av_mallocz(sizeof(AVFilterLink*) * ret->input_count);
518
    }
519

    
520
    ret->output_count = pad_count(filter->outputs);
521
    if (ret->output_count) {
522
        ret->output_pads  = av_malloc(sizeof(AVFilterPad) * ret->output_count);
523
        memcpy(ret->output_pads, filter->outputs, sizeof(AVFilterPad) * ret->output_count);
524
        ret->outputs      = av_mallocz(sizeof(AVFilterLink*) * ret->output_count);
525
    }
526

    
527
    *filter_ctx = ret;
528
    return 0;
529
}
530

    
531
void avfilter_destroy(AVFilterContext *filter)
532
{
533
    int i;
534
    AVFilterLink *link;
535

    
536
    if (filter->filter->uninit)
537
        filter->filter->uninit(filter);
538

    
539
    for (i = 0; i < filter->input_count; i++) {
540
        if ((link = filter->inputs[i])) {
541
            if (link->src)
542
                link->src->outputs[link->srcpad - link->src->output_pads] = NULL;
543
            avfilter_formats_unref(&link->in_formats);
544
            avfilter_formats_unref(&link->out_formats);
545
        }
546
        av_freep(&link);
547
    }
548
    for (i = 0; i < filter->output_count; i++) {
549
        if ((link = filter->outputs[i])) {
550
            if (link->dst)
551
                link->dst->inputs[link->dstpad - link->dst->input_pads] = NULL;
552
            avfilter_formats_unref(&link->in_formats);
553
            avfilter_formats_unref(&link->out_formats);
554
        }
555
        av_freep(&link);
556
    }
557

    
558
    av_freep(&filter->name);
559
    av_freep(&filter->input_pads);
560
    av_freep(&filter->output_pads);
561
    av_freep(&filter->inputs);
562
    av_freep(&filter->outputs);
563
    av_freep(&filter->priv);
564
    av_free(filter);
565
}
566

    
567
int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque)
568
{
569
    int ret=0;
570

    
571
    if (filter->filter->init)
572
        ret = filter->filter->init(filter, args, opaque);
573
    return ret;
574
}
575