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ffmpeg / libavfilter / avfilter.c @ dc46661a

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1
/*
2
 * filter layer
3
 * copyright (c) 2007 Bobby Bingham
4
 *
5
 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
 * Lesser General Public License for more details.
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 *
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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 "libavcodec/audioconvert.c"
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#include "libavutil/pixdesc.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;
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}
44

    
45
/** helper macros to get the in/out pad on the dst/src filter */
46
#define link_dpad(link)     link->dst-> input_pads[link->dstpad]
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#define link_spad(link)     link->src->output_pads[link->srcpad]
48

    
49
AVFilterBufferRef *avfilter_ref_buffer(AVFilterBufferRef *ref, int pmask)
50
{
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    AVFilterBufferRef *ret = av_malloc(sizeof(AVFilterBufferRef));
52
    if (!ret)
53
        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));
57
        if (!ret->video) {
58
            av_free(ret);
59
            return NULL;
60
        }
61
        *ret->video = *ref->video;
62
    } else if (ref->type == AVMEDIA_TYPE_AUDIO) {
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        ret->audio = av_malloc(sizeof(AVFilterBufferRefAudioProps));
64
        if (!ret->audio) {
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            av_free(ret);
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            return NULL;
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        }
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        *ret->audio = *ref->audio;
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    }
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    ret->perms &= pmask;
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    ret->buf->refcount ++;
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    return ret;
73
}
74

    
75
void avfilter_unref_buffer(AVFilterBufferRef *ref)
76
{
77
    if (!(--ref->buf->refcount))
78
        ref->buf->free(ref->buf);
79
    av_free(ref->video);
80
    av_free(ref->audio);
81
    av_free(ref);
82
}
83

    
84
void avfilter_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
85
                         AVFilterPad **pads, AVFilterLink ***links,
86
                         AVFilterPad *newpad)
87
{
88
    unsigned i;
89

    
90
    idx = FFMIN(idx, *count);
91

    
92
    *pads  = av_realloc(*pads,  sizeof(AVFilterPad)   * (*count + 1));
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    *links = av_realloc(*links, sizeof(AVFilterLink*) * (*count + 1));
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    memmove(*pads +idx+1, *pads +idx, sizeof(AVFilterPad)   * (*count-idx));
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    memmove(*links+idx+1, *links+idx, sizeof(AVFilterLink*) * (*count-idx));
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    memcpy(*pads+idx, newpad, sizeof(AVFilterPad));
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    (*links)[idx] = NULL;
98

    
99
    (*count)++;
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    for (i = idx+1; i < *count; i++)
101
        if (*links[i])
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            (*(unsigned *)((uint8_t *) *links[i] + padidx_off))++;
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}
104

    
105
int avfilter_link(AVFilterContext *src, unsigned srcpad,
106
                  AVFilterContext *dst, unsigned dstpad)
107
{
108
    AVFilterLink *link;
109

    
110
    if (src->output_count <= srcpad || dst->input_count <= dstpad ||
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        src->outputs[srcpad]        || dst->inputs[dstpad])
112
        return -1;
113

    
114
    src->outputs[srcpad] =
115
    dst-> inputs[dstpad] = link = av_mallocz(sizeof(AVFilterLink));
116

    
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    link->src     = src;
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    link->dst     = dst;
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    link->srcpad  = srcpad;
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    link->dstpad  = dstpad;
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    link->type    = src->output_pads[srcpad].type;
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    assert(PIX_FMT_NONE == -1 && SAMPLE_FMT_NONE == -1);
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    link->format  = -1;
124

    
125
    return 0;
126
}
127

    
128
int avfilter_insert_filter(AVFilterLink *link, AVFilterContext *filt,
129
                           unsigned in, unsigned out)
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[link->dstpad] = NULL;
136
    if (avfilter_link(filt, out, link->dst, link->dstpad)) {
137
        /* failed to link output filter to new filter */
138
        link->dst->inputs[link->dstpad] = link;
139
        return -1;
140
    }
141

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

    
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 (avfilter_config_links(link->src))
176
                return -1;
177

    
178
            if (!(config_link = link_spad(link).config_props))
179
                config_link  = avfilter_default_config_output_link;
180
            if (config_link(link))
181
                return -1;
182

    
183
            if ((config_link = link_dpad(link).config_props))
184
                if (config_link(link))
185
                    return -1;
186

    
187
            link->init_state = AVLINK_INIT;
188
        }
189
    }
190

    
191
    return 0;
192
}
193

    
194
void ff_dprintf_picref(void *ctx, AVFilterBufferRef *picref, int end)
195
{
196
    dprintf(ctx,
197
            "picref[%p data[%p, %p, %p, %p] linesize[%d, %d, %d, %d] pts:%"PRId64" pos:%"PRId64" a:%d/%d s:%dx%d]%s",
198
            picref,
199
            picref->data    [0], picref->data    [1], picref->data    [2], picref->data    [3],
200
            picref->linesize[0], picref->linesize[1], picref->linesize[2], picref->linesize[3],
201
            picref->pts, picref->pos,
202
            picref->video->pixel_aspect.num, picref->video->pixel_aspect.den, picref->video->w, picref->video->h,
203
            end ? "\n" : "");
204
}
205

    
206
void ff_dprintf_link(void *ctx, AVFilterLink *link, int end)
207
{
208
    dprintf(ctx,
209
            "link[%p s:%dx%d fmt:%-16s %-16s->%-16s]%s",
210
            link, link->w, link->h,
211
            av_pix_fmt_descriptors[link->format].name,
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            link->src ? link->src->filter->name : "",
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            link->dst ? link->dst->filter->name : "",
214
            end ? "\n" : "");
215
}
216

    
217
AVFilterBufferRef *avfilter_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
218
{
219
    AVFilterBufferRef *ret = NULL;
220

    
221
    FF_DPRINTF_START(NULL, get_video_buffer); ff_dprintf_link(NULL, link, 0); dprintf(NULL, " perms:%d w:%d h:%d\n", perms, w, h);
222

    
223
    if (link_dpad(link).get_video_buffer)
224
        ret = link_dpad(link).get_video_buffer(link, perms, w, h);
225

    
226
    if (!ret)
227
        ret = avfilter_default_get_video_buffer(link, perms, w, h);
228

    
229
    if (ret)
230
        ret->type = AVMEDIA_TYPE_VIDEO;
231

    
232
    FF_DPRINTF_START(NULL, get_video_buffer); ff_dprintf_link(NULL, link, 0); dprintf(NULL, " returning "); ff_dprintf_picref(NULL, ret, 1);
233

    
234
    return ret;
235
}
236

    
237
AVFilterBufferRef *avfilter_get_audio_buffer(AVFilterLink *link, int perms,
238
                                             enum SampleFormat sample_fmt, int size,
239
                                             int64_t channel_layout, int planar)
240
{
241
    AVFilterBufferRef *ret = NULL;
242

    
243
    if (link_dpad(link).get_audio_buffer)
244
        ret = link_dpad(link).get_audio_buffer(link, perms, sample_fmt, size, channel_layout, planar);
245

    
246
    if (!ret)
247
        ret = avfilter_default_get_audio_buffer(link, perms, sample_fmt, size, channel_layout, planar);
248

    
249
    if (ret)
250
        ret->type = AVMEDIA_TYPE_AUDIO;
251

    
252
    return ret;
253
}
254

    
255
int avfilter_request_frame(AVFilterLink *link)
256
{
257
    FF_DPRINTF_START(NULL, request_frame); ff_dprintf_link(NULL, link, 1);
258

    
259
    if (link_spad(link).request_frame)
260
        return link_spad(link).request_frame(link);
261
    else if (link->src->inputs[0])
262
        return avfilter_request_frame(link->src->inputs[0]);
263
    else return -1;
264
}
265

    
266
int avfilter_poll_frame(AVFilterLink *link)
267
{
268
    int i, min = INT_MAX;
269

    
270
    if (link_spad(link).poll_frame)
271
        return link_spad(link).poll_frame(link);
272

    
273
    for (i = 0; i < link->src->input_count; i++) {
274
        int val;
275
        if (!link->src->inputs[i])
276
            return -1;
277
        val = avfilter_poll_frame(link->src->inputs[i]);
278
        min = FFMIN(min, val);
279
    }
280

    
281
    return min;
282
}
283

    
284
/* XXX: should we do the duplicating of the picture ref here, instead of
285
 * forcing the source filter to do it? */
286
void avfilter_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
287
{
288
    void (*start_frame)(AVFilterLink *, AVFilterBufferRef *);
289
    AVFilterPad *dst = &link_dpad(link);
290

    
291
    FF_DPRINTF_START(NULL, start_frame); ff_dprintf_link(NULL, link, 0); dprintf(NULL, " "); ff_dprintf_picref(NULL, picref, 1);
292

    
293
    if (!(start_frame = dst->start_frame))
294
        start_frame = avfilter_default_start_frame;
295

    
296
    /* prepare to copy the picture if it has insufficient permissions */
297
    if ((dst->min_perms & picref->perms) != dst->min_perms ||
298
         dst->rej_perms & picref->perms) {
299
        av_log(link->dst, AV_LOG_DEBUG,
300
                "frame copy needed (have perms %x, need %x, reject %x)\n",
301
                picref->perms,
302
                link_dpad(link).min_perms, link_dpad(link).rej_perms);
303

    
304
        link->cur_buf = avfilter_default_get_video_buffer(link, dst->min_perms, link->w, link->h);
305
        link->src_buf = picref;
306
        avfilter_copy_buffer_ref_props(link->cur_buf, link->src_buf);
307
    }
308
    else
309
        link->cur_buf = picref;
310

    
311
    start_frame(link, link->cur_buf);
312
}
313

    
314
void avfilter_end_frame(AVFilterLink *link)
315
{
316
    void (*end_frame)(AVFilterLink *);
317

    
318
    if (!(end_frame = link_dpad(link).end_frame))
319
        end_frame = avfilter_default_end_frame;
320

    
321
    end_frame(link);
322

    
323
    /* unreference the source picture if we're feeding the destination filter
324
     * a copied version dues to permission issues */
325
    if (link->src_buf) {
326
        avfilter_unref_buffer(link->src_buf);
327
        link->src_buf = NULL;
328
    }
329
}
330

    
331
void avfilter_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
332
{
333
    uint8_t *src[4], *dst[4];
334
    int i, j, vsub;
335
    void (*draw_slice)(AVFilterLink *, int, int, int);
336

    
337
    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);
338

    
339
    /* copy the slice if needed for permission reasons */
340
    if (link->src_buf) {
341
        vsub = av_pix_fmt_descriptors[link->format].log2_chroma_h;
342

    
343
        for (i = 0; i < 4; i++) {
344
            if (link->src_buf->data[i]) {
345
                src[i] = link->src_buf-> data[i] +
346
                    (y >> (i==0 ? 0 : vsub)) * link->src_buf-> linesize[i];
347
                dst[i] = link->cur_buf->data[i] +
348
                    (y >> (i==0 ? 0 : vsub)) * link->cur_buf->linesize[i];
349
            } else
350
                src[i] = dst[i] = NULL;
351
        }
352

    
353
        for (i = 0; i < 4; i++) {
354
            int planew =
355
                av_get_image_linesize(link->format, link->cur_buf->video->w, i);
356

    
357
            if (!src[i]) continue;
358

    
359
            for (j = 0; j < h >> (i==0 ? 0 : vsub); j++) {
360
                memcpy(dst[i], src[i], planew);
361
                src[i] += link->src_buf->linesize[i];
362
                dst[i] += link->cur_buf->linesize[i];
363
            }
364
        }
365
    }
366

    
367
    if (!(draw_slice = link_dpad(link).draw_slice))
368
        draw_slice = avfilter_default_draw_slice;
369
    draw_slice(link, y, h, slice_dir);
370
}
371

    
372
void avfilter_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref)
373
{
374
    void (*filter_samples)(AVFilterLink *, AVFilterBufferRef *);
375
    AVFilterPad *dst = &link_dpad(link);
376

    
377
    if (!(filter_samples = dst->filter_samples))
378
        filter_samples = avfilter_default_filter_samples;
379

    
380
    /* prepare to copy the samples if the buffer has insufficient permissions */
381
    if ((dst->min_perms & samplesref->perms) != dst->min_perms ||
382
        dst->rej_perms & samplesref->perms) {
383

    
384
        av_log(link->dst, AV_LOG_DEBUG,
385
               "Copying audio data in avfilter (have perms %x, need %x, reject %x)\n",
386
               samplesref->perms, link_dpad(link).min_perms, link_dpad(link).rej_perms);
387

    
388
        link->cur_buf = avfilter_default_get_audio_buffer(link, dst->min_perms,
389
                                                          samplesref->format,
390
                                                          samplesref->audio->size,
391
                                                          samplesref->audio->channel_layout,
392
                                                          samplesref->audio->planar);
393
        link->cur_buf->pts                = samplesref->pts;
394
        link->cur_buf->audio->sample_rate = samplesref->audio->sample_rate;
395

    
396
        /* Copy actual data into new samples buffer */
397
        memcpy(link->cur_buf->data[0], samplesref->data[0], samplesref->audio->size);
398

    
399
        avfilter_unref_buffer(samplesref);
400
    } else
401
        link->cur_buf = samplesref;
402

    
403
    filter_samples(link, link->cur_buf);
404
}
405

    
406
#define MAX_REGISTERED_AVFILTERS_NB 64
407

    
408
static AVFilter *registered_avfilters[MAX_REGISTERED_AVFILTERS_NB + 1];
409

    
410
static int next_registered_avfilter_idx = 0;
411

    
412
AVFilter *avfilter_get_by_name(const char *name)
413
{
414
    int i;
415

    
416
    for (i = 0; registered_avfilters[i]; i++)
417
        if (!strcmp(registered_avfilters[i]->name, name))
418
            return registered_avfilters[i];
419

    
420
    return NULL;
421
}
422

    
423
int avfilter_register(AVFilter *filter)
424
{
425
    if (next_registered_avfilter_idx == MAX_REGISTERED_AVFILTERS_NB)
426
        return -1;
427

    
428
    registered_avfilters[next_registered_avfilter_idx++] = filter;
429
    return 0;
430
}
431

    
432
AVFilter **av_filter_next(AVFilter **filter)
433
{
434
    return filter ? ++filter : &registered_avfilters[0];
435
}
436

    
437
void avfilter_uninit(void)
438
{
439
    memset(registered_avfilters, 0, sizeof(registered_avfilters));
440
    next_registered_avfilter_idx = 0;
441
}
442

    
443
static int pad_count(const AVFilterPad *pads)
444
{
445
    int count;
446

    
447
    for(count = 0; pads->name; count ++) pads ++;
448
    return count;
449
}
450

    
451
static const char *filter_name(void *p)
452
{
453
    AVFilterContext *filter = p;
454
    return filter->filter->name;
455
}
456

    
457
static const AVClass avfilter_class = {
458
    "AVFilter",
459
    filter_name,
460
    NULL,
461
    LIBAVUTIL_VERSION_INT,
462
};
463

    
464
int avfilter_open(AVFilterContext **filter_ctx, AVFilter *filter, const char *inst_name)
465
{
466
    AVFilterContext *ret;
467
    *filter_ctx = NULL;
468

    
469
    if (!filter)
470
        return AVERROR(EINVAL);
471

    
472
    ret = av_mallocz(sizeof(AVFilterContext));
473

    
474
    ret->av_class = &avfilter_class;
475
    ret->filter   = filter;
476
    ret->name     = inst_name ? av_strdup(inst_name) : NULL;
477
    ret->priv     = av_mallocz(filter->priv_size);
478

    
479
    ret->input_count  = pad_count(filter->inputs);
480
    if (ret->input_count) {
481
        ret->input_pads   = av_malloc(sizeof(AVFilterPad) * ret->input_count);
482
        memcpy(ret->input_pads, filter->inputs, sizeof(AVFilterPad) * ret->input_count);
483
        ret->inputs       = av_mallocz(sizeof(AVFilterLink*) * ret->input_count);
484
    }
485

    
486
    ret->output_count = pad_count(filter->outputs);
487
    if (ret->output_count) {
488
        ret->output_pads  = av_malloc(sizeof(AVFilterPad) * ret->output_count);
489
        memcpy(ret->output_pads, filter->outputs, sizeof(AVFilterPad) * ret->output_count);
490
        ret->outputs      = av_mallocz(sizeof(AVFilterLink*) * ret->output_count);
491
    }
492

    
493
    *filter_ctx = ret;
494
    return 0;
495
}
496

    
497
void avfilter_destroy(AVFilterContext *filter)
498
{
499
    int i;
500

    
501
    if (filter->filter->uninit)
502
        filter->filter->uninit(filter);
503

    
504
    for (i = 0; i < filter->input_count; i++) {
505
        if (filter->inputs[i]) {
506
            if (filter->inputs[i]->src)
507
                filter->inputs[i]->src->outputs[filter->inputs[i]->srcpad] = NULL;
508
            avfilter_formats_unref(&filter->inputs[i]->in_formats);
509
            avfilter_formats_unref(&filter->inputs[i]->out_formats);
510
        }
511
        av_freep(&filter->inputs[i]);
512
    }
513
    for (i = 0; i < filter->output_count; i++) {
514
        if (filter->outputs[i]) {
515
            if (filter->outputs[i]->dst)
516
                filter->outputs[i]->dst->inputs[filter->outputs[i]->dstpad] = NULL;
517
            avfilter_formats_unref(&filter->outputs[i]->in_formats);
518
            avfilter_formats_unref(&filter->outputs[i]->out_formats);
519
        }
520
        av_freep(&filter->outputs[i]);
521
    }
522

    
523
    av_freep(&filter->name);
524
    av_freep(&filter->input_pads);
525
    av_freep(&filter->output_pads);
526
    av_freep(&filter->inputs);
527
    av_freep(&filter->outputs);
528
    av_freep(&filter->priv);
529
    av_free(filter);
530
}
531

    
532
int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque)
533
{
534
    int ret=0;
535

    
536
    if (filter->filter->init)
537
        ret = filter->filter->init(filter, args, opaque);
538
    return ret;
539
}
540