Statistics
| Branch: | Revision:

ffmpeg / libavfilter / avfilter.c @ c1736936

History | View | Annotate | Download (12.8 KB)

1
/*
2
 * filter layer
3
 * copyright (c) 2007 Bobby Bingham
4
 *
5
 * This file is part of FFmpeg.
6
 *
7
 * FFmpeg is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
9
 * License as published by the Free Software Foundation; either
10
 * version 2.1 of the License, or (at your option) any later version.
11
 *
12
 * FFmpeg is distributed in the hope that it will be useful,
13
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
 * Lesser General Public License for more details.
16
 *
17
 * You should have received a copy of the GNU Lesser General Public
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
/* #define DEBUG */
23

    
24
#include "libavcodec/imgconvert.h"
25
#include "avfilter.h"
26

    
27
unsigned avfilter_version(void) {
28
    return LIBAVFILTER_VERSION_INT;
29
}
30

    
31
const char * avfilter_configuration(void)
32
{
33
    return FFMPEG_CONFIGURATION;
34
}
35

    
36
const char * avfilter_license(void)
37
{
38
#define LICENSE_PREFIX "libavfilter license: "
39
    return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
40
}
41

    
42
/** helper macros to get the in/out pad on the dst/src filter */
43
#define link_dpad(link)     link->dst-> input_pads[link->dstpad]
44
#define link_spad(link)     link->src->output_pads[link->srcpad]
45

    
46
AVFilterPicRef *avfilter_ref_pic(AVFilterPicRef *ref, int pmask)
47
{
48
    AVFilterPicRef *ret = av_malloc(sizeof(AVFilterPicRef));
49
    *ret = *ref;
50
    ret->perms &= pmask;
51
    ret->pic->refcount ++;
52
    return ret;
53
}
54

    
55
void avfilter_unref_pic(AVFilterPicRef *ref)
56
{
57
    if(!(--ref->pic->refcount))
58
        ref->pic->free(ref->pic);
59
    av_free(ref);
60
}
61

    
62
void avfilter_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
63
                         AVFilterPad **pads, AVFilterLink ***links,
64
                         AVFilterPad *newpad)
65
{
66
    unsigned i;
67

    
68
    idx = FFMIN(idx, *count);
69

    
70
    *pads  = av_realloc(*pads,  sizeof(AVFilterPad)   * (*count + 1));
71
    *links = av_realloc(*links, sizeof(AVFilterLink*) * (*count + 1));
72
    memmove(*pads +idx+1, *pads +idx, sizeof(AVFilterPad)   * (*count-idx));
73
    memmove(*links+idx+1, *links+idx, sizeof(AVFilterLink*) * (*count-idx));
74
    memcpy(*pads+idx, newpad, sizeof(AVFilterPad));
75
    (*links)[idx] = NULL;
76

    
77
    (*count) ++;
78
    for(i = idx+1; i < *count; i ++)
79
        if(*links[i])
80
            (*(unsigned *)((uint8_t *) *links[i] + padidx_off)) ++;
81
}
82

    
83
int avfilter_link(AVFilterContext *src, unsigned srcpad,
84
                  AVFilterContext *dst, unsigned dstpad)
85
{
86
    AVFilterLink *link;
87

    
88
    if(src->output_count <= srcpad || dst->input_count <= dstpad ||
89
       src->outputs[srcpad]        || dst->inputs[dstpad])
90
        return -1;
91

    
92
    src->outputs[srcpad] =
93
    dst-> inputs[dstpad] = link = av_mallocz(sizeof(AVFilterLink));
94

    
95
    link->src     = src;
96
    link->dst     = dst;
97
    link->srcpad  = srcpad;
98
    link->dstpad  = dstpad;
99
    link->format  = PIX_FMT_NONE;
100

    
101
    return 0;
102
}
103

    
104
int avfilter_insert_filter(AVFilterLink *link, AVFilterContext *filt,
105
                           unsigned in, unsigned out)
106
{
107
    av_log(link->dst, AV_LOG_INFO, "auto-inserting filter '%s'\n",
108
            filt->filter->name);
109

    
110
    link->dst->inputs[link->dstpad] = NULL;
111
    if(avfilter_link(filt, out, link->dst, link->dstpad)) {
112
        /* failed to link output filter to new filter */
113
        link->dst->inputs[link->dstpad] = link;
114
        return -1;
115
    }
116

    
117
    /* re-hookup the link to the new destination filter we inserted */
118
    link->dst = filt;
119
    link->dstpad = in;
120
    filt->inputs[in] = link;
121

    
122
    /* if any information on supported colorspaces already exists on the
123
     * link, we need to preserve that */
124
    if(link->out_formats)
125
        avfilter_formats_changeref(&link->out_formats,
126
                                   &filt->outputs[out]->out_formats);
127

    
128
    return 0;
129
}
130

    
131
int avfilter_config_links(AVFilterContext *filter)
132
{
133
    int (*config_link)(AVFilterLink *);
134
    unsigned i;
135

    
136
    for(i = 0; i < filter->input_count; i ++) {
137
        AVFilterLink *link = filter->inputs[i];
138

    
139
        if(!link) continue;
140

    
141
        switch(link->init_state) {
142
        case AVLINK_INIT:
143
            continue;
144
        case AVLINK_STARTINIT:
145
            av_log(filter, AV_LOG_INFO, "circular filter chain detected\n");
146
            return 0;
147
        case AVLINK_UNINIT:
148
            link->init_state = AVLINK_STARTINIT;
149

    
150
            if(avfilter_config_links(link->src))
151
                return -1;
152

    
153
            if(!(config_link = link_spad(link).config_props))
154
                config_link  = avfilter_default_config_output_link;
155
            if(config_link(link))
156
                return -1;
157

    
158
            if((config_link = link_dpad(link).config_props))
159
                if(config_link(link))
160
                    return -1;
161

    
162
            link->init_state = AVLINK_INIT;
163
        }
164
    }
165

    
166
    return 0;
167
}
168

    
169
static void dprintf_picref(void *ctx, AVFilterPicRef *picref, int end)
170
{
171
    dprintf(ctx,
172
            "picref[%p data[%p, %p, %p, %p] linesize[%d, %d, %d, %d] pts:%"PRId64" s:%dx%d]%s",
173
            picref,
174
            picref->data    [0], picref->data    [1], picref->data    [2], picref->data    [3],
175
            picref->linesize[0], picref->linesize[1], picref->linesize[2], picref->linesize[3],
176
            picref->pts, picref->w, picref->h,
177
            end ? "\n" : "");
178
}
179

    
180
static void dprintf_link(void *ctx, AVFilterLink *link, int end)
181
{
182
    dprintf(ctx,
183
            "link[%p s:%dx%d fmt:%-16s %-16s->%-16s]%s",
184
            link, link->w, link->h,
185
            avcodec_get_pix_fmt_name(link->format),
186
            link->src ? link->src->filter->name : "",
187
            link->dst ? link->dst->filter->name : "",
188
            end ? "\n" : "");
189
}
190

    
191
#define DPRINTF_START(ctx, func) dprintf(NULL, "%-16s: ", #func)
192

    
193
AVFilterPicRef *avfilter_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
194
{
195
    AVFilterPicRef *ret = NULL;
196

    
197
    DPRINTF_START(NULL, get_video_buffer); dprintf_link(NULL, link, 0); dprintf(NULL, " perms:%d w:%d h:%d\n", perms, w, h);
198

    
199
    if(link_dpad(link).get_video_buffer)
200
        ret = link_dpad(link).get_video_buffer(link, perms, w, h);
201

    
202
    if(!ret)
203
        ret = avfilter_default_get_video_buffer(link, perms, w, h);
204

    
205
    DPRINTF_START(NULL, get_video_buffer); dprintf_link(NULL, link, 0); dprintf(NULL, " returning "); dprintf_picref(NULL, ret, 1);
206

    
207
    return ret;
208
}
209

    
210
int avfilter_request_frame(AVFilterLink *link)
211
{
212
    DPRINTF_START(NULL, request_frame); dprintf_link(NULL, link, 1);
213

    
214
    if(link_spad(link).request_frame)
215
        return link_spad(link).request_frame(link);
216
    else if(link->src->inputs[0])
217
        return avfilter_request_frame(link->src->inputs[0]);
218
    else return -1;
219
}
220

    
221
int avfilter_poll_frame(AVFilterLink *link)
222
{
223
    int i, min=INT_MAX;
224

    
225
    if(link_spad(link).poll_frame)
226
        return link_spad(link).poll_frame(link);
227

    
228
    for (i=0; i<link->src->input_count; i++) {
229
        int val;
230
        if(!link->src->inputs[i])
231
            return -1;
232
        val = avfilter_poll_frame(link->src->inputs[i]);
233
        min = FFMIN(min, val);
234
    }
235

    
236
    return min;
237
}
238

    
239
/* XXX: should we do the duplicating of the picture ref here, instead of
240
 * forcing the source filter to do it? */
241
void avfilter_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
242
{
243
    void (*start_frame)(AVFilterLink *, AVFilterPicRef *);
244
    AVFilterPad *dst = &link_dpad(link);
245

    
246
    DPRINTF_START(NULL, start_frame); dprintf_link(NULL, link, 0); dprintf(NULL, " "); dprintf_picref(NULL, picref, 1);
247

    
248
    if(!(start_frame = dst->start_frame))
249
        start_frame = avfilter_default_start_frame;
250

    
251
    /* prepare to copy the picture if it has insufficient permissions */
252
    if((dst->min_perms & picref->perms) != dst->min_perms ||
253
        dst->rej_perms & picref->perms) {
254
        /*
255
        av_log(link->dst, AV_LOG_INFO,
256
                "frame copy needed (have perms %x, need %x, reject %x)\n",
257
                picref->perms,
258
                link_dpad(link).min_perms, link_dpad(link).rej_perms);
259
        */
260

    
261
        link->cur_pic = avfilter_default_get_video_buffer(link, dst->min_perms, link->w, link->h);
262
        link->srcpic = picref;
263
        link->cur_pic->pts = link->srcpic->pts;
264
        link->cur_pic->pixel_aspect = link->srcpic->pixel_aspect;
265
    }
266
    else
267
        link->cur_pic = picref;
268

    
269
    start_frame(link, link->cur_pic);
270
}
271

    
272
void avfilter_end_frame(AVFilterLink *link)
273
{
274
    void (*end_frame)(AVFilterLink *);
275

    
276
    if(!(end_frame = link_dpad(link).end_frame))
277
        end_frame = avfilter_default_end_frame;
278

    
279
    end_frame(link);
280

    
281
    /* unreference the source picture if we're feeding the destination filter
282
     * a copied version dues to permission issues */
283
    if(link->srcpic) {
284
        avfilter_unref_pic(link->srcpic);
285
        link->srcpic = NULL;
286
    }
287

    
288
}
289

    
290
void avfilter_draw_slice(AVFilterLink *link, int y, int h)
291
{
292
    uint8_t *src[4], *dst[4];
293
    int i, j, hsub, vsub;
294
    void (*draw_slice)(AVFilterLink *, int, int);
295

    
296
    DPRINTF_START(NULL, draw_slice); dprintf_link(NULL, link, 0); dprintf(NULL, " y:%d h:%d\n", y, h);
297

    
298
    /* copy the slice if needed for permission reasons */
299
    if(link->srcpic) {
300
        avcodec_get_chroma_sub_sample(link->format, &hsub, &vsub);
301

    
302
        for(i = 0; i < 4; i ++) {
303
            if(link->srcpic->data[i]) {
304
                src[i] = link->srcpic-> data[i] +
305
                    (y >> (i==0 ? 0 : vsub)) * link->srcpic-> linesize[i];
306
                dst[i] = link->cur_pic->data[i] +
307
                    (y >> (i==0 ? 0 : vsub)) * link->cur_pic->linesize[i];
308
            } else
309
                src[i] = dst[i] = NULL;
310
        }
311

    
312
        for(i = 0; i < 4; i ++) {
313
            int planew =
314
                ff_get_plane_bytewidth(link->format, link->cur_pic->w, i);
315

    
316
            if(!src[i]) continue;
317

    
318
            for(j = 0; j < h >> (i==0 ? 0 : vsub); j ++) {
319
                memcpy(dst[i], src[i], planew);
320
                src[i] += link->srcpic ->linesize[i];
321
                dst[i] += link->cur_pic->linesize[i];
322
            }
323
        }
324
    }
325

    
326
    if(!(draw_slice = link_dpad(link).draw_slice))
327
        draw_slice = avfilter_default_draw_slice;
328
    draw_slice(link, y, h);
329
}
330

    
331
AVFilter *first_avfilter = NULL;
332

    
333
AVFilter *avfilter_get_by_name(const char *name)
334
{
335
    AVFilter *filter;
336

    
337
    for (filter = first_avfilter; filter; filter = filter->next)
338
        if (!strcmp(filter->name, name))
339
            return filter;
340

    
341
    return NULL;
342
}
343

    
344
void avfilter_register(AVFilter *filter)
345
{
346
    AVFilter **p;
347
    p = &first_avfilter;
348
    while (*p)
349
        p = &(*p)->next;
350

    
351
    *p = filter;
352
    filter->next = NULL;
353
}
354

    
355
void avfilter_uninit(void)
356
{
357
    first_avfilter = NULL;
358
}
359

    
360
static int pad_count(const AVFilterPad *pads)
361
{
362
    int count;
363

    
364
    for(count = 0; pads->name; count ++) pads ++;
365
    return count;
366
}
367

    
368
static const char *filter_name(void *p)
369
{
370
    AVFilterContext *filter = p;
371
    return filter->filter->name;
372
}
373

    
374
static const AVClass avfilter_class = {
375
    "AVFilter",
376
    filter_name
377
};
378

    
379
AVFilterContext *avfilter_open(AVFilter *filter, const char *inst_name)
380
{
381
    AVFilterContext *ret;
382

    
383
    if (!filter)
384
        return 0;
385

    
386
    ret = av_mallocz(sizeof(AVFilterContext));
387

    
388
    ret->av_class = &avfilter_class;
389
    ret->filter   = filter;
390
    ret->name     = inst_name ? av_strdup(inst_name) : NULL;
391
    ret->priv     = av_mallocz(filter->priv_size);
392

    
393
    ret->input_count  = pad_count(filter->inputs);
394
    if (ret->input_count) {
395
        ret->input_pads   = av_malloc(sizeof(AVFilterPad) * ret->input_count);
396
        memcpy(ret->input_pads, filter->inputs, sizeof(AVFilterPad) * ret->input_count);
397
        ret->inputs       = av_mallocz(sizeof(AVFilterLink*) * ret->input_count);
398
    }
399

    
400
    ret->output_count = pad_count(filter->outputs);
401
    if (ret->output_count) {
402
        ret->output_pads  = av_malloc(sizeof(AVFilterPad) * ret->output_count);
403
        memcpy(ret->output_pads, filter->outputs, sizeof(AVFilterPad) * ret->output_count);
404
        ret->outputs      = av_mallocz(sizeof(AVFilterLink*) * ret->output_count);
405
    }
406

    
407
    return ret;
408
}
409

    
410
void avfilter_destroy(AVFilterContext *filter)
411
{
412
    int i;
413

    
414
    if(filter->filter->uninit)
415
        filter->filter->uninit(filter);
416

    
417
    for(i = 0; i < filter->input_count; i ++) {
418
        if(filter->inputs[i])
419
            filter->inputs[i]->src->outputs[filter->inputs[i]->srcpad] = NULL;
420
        av_freep(&filter->inputs[i]);
421
    }
422
    for(i = 0; i < filter->output_count; i ++) {
423
        if(filter->outputs[i])
424
            filter->outputs[i]->dst->inputs[filter->outputs[i]->dstpad] = NULL;
425
        av_freep(&filter->outputs[i]);
426
    }
427

    
428
    av_freep(&filter->name);
429
    av_freep(&filter->input_pads);
430
    av_freep(&filter->output_pads);
431
    av_freep(&filter->inputs);
432
    av_freep(&filter->outputs);
433
    av_freep(&filter->priv);
434
    av_free(filter);
435
}
436

    
437
int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque)
438
{
439
    int ret=0;
440

    
441
    if(filter->filter->init)
442
        ret = filter->filter->init(filter, args, opaque);
443
    return ret;
444
}
445