f2a42cbd50aaf080362bb277b7d24cde409000a3
[ffmpeg.git] / libavfilter / avfilter.c
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 #include <stdarg.h>
23 #include <stdlib.h>
24 #include <string.h>
25 #include <stdio.h>
26
27 #include "avfilter.h"
28 #include "allfilters.h"
29
30 /** list of registered filters */
31 struct FilterList
32 {
33     AVFilter *filter;
34     struct FilterList *next;
35 } *filters = NULL;
36
37 /** helper macros to get the in/out pad on the dst/src filter */
38 #define link_dpad(link)     link->dst-> input_pads[link->dstpad]
39 #define link_spad(link)     link->src->output_pads[link->srcpad]
40
41 AVFilterPicRef *avfilter_ref_pic(AVFilterPicRef *ref, int pmask)
42 {
43     AVFilterPicRef *ret = av_malloc(sizeof(AVFilterPicRef));
44     *ret = *ref;
45     ret->perms &= pmask;
46     ret->pic->refcount ++;
47     return ret;
48 }
49
50 void avfilter_unref_pic(AVFilterPicRef *ref)
51 {
52     if(-- ref->pic->refcount == 0)
53         ref->pic->free(ref->pic);
54     av_free(ref);
55 }
56
57 void avfilter_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
58                          AVFilterPad **pads, AVFilterLink ***links,
59                          AVFilterPad *newpad)
60 {
61     unsigned i;
62
63     idx = FFMIN(idx, *count);
64
65     *pads  = av_realloc(*pads,  sizeof(AVFilterPad)   * (*count + 1));
66     *links = av_realloc(*links, sizeof(AVFilterLink*) * (*count + 1));
67     memmove(*pads +idx+1, *pads +idx, sizeof(AVFilterPad)   * (*count-idx));
68     memmove(*links+idx+1, *links+idx, sizeof(AVFilterLink*) * (*count-idx));
69     memcpy(*pads+idx, newpad, sizeof(AVFilterPad));
70     (*links)[idx] = NULL;
71
72     (*count) ++;
73     for(i = idx+1; i < *count; i ++)
74         if(*links[i])
75             (*(unsigned *)((uint8_t *)(*links[i]) + padidx_off)) ++;
76 }
77
78 int avfilter_link(AVFilterContext *src, unsigned srcpad,
79                   AVFilterContext *dst, unsigned dstpad)
80 {
81     AVFilterLink *link;
82
83     if(src->output_count <= srcpad || dst->input_count <= dstpad ||
84        src->outputs[srcpad]        || dst->inputs[dstpad])
85         return -1;
86
87     src->outputs[srcpad] =
88     dst->inputs[dstpad]  = link = av_mallocz(sizeof(AVFilterLink));
89
90     link->src     = src;
91     link->dst     = dst;
92     link->srcpad  = srcpad;
93     link->dstpad  = dstpad;
94     link->format  = -1;
95
96     return 0;
97 }
98
99 int avfilter_insert_filter(AVFilterLink *link, AVFilterContext *filt,
100                            unsigned in, unsigned out)
101 {
102     AVFilterFormats *formats;
103
104     av_log(NULL, AV_LOG_INFO, "auto-inserting filter '%s'\n",
105             filt->filter->name);
106
107     link->dst->inputs[link->dstpad] = NULL;
108     if(avfilter_link(filt, out, link->dst, link->dstpad)) {
109         /* failed to link output filter to new filter */
110         link->dst->inputs[link->dstpad] = link;
111         return -1;
112     }
113
114     /* re-hookup the link to the new destination filter we inserted */
115     link->dst = filt;
116     link->dstpad = in;
117     filt->inputs[in] = link;
118
119     /* if any information on supported colorspaces already exists on the
120      * link, we need to preserve that */
121     if((formats = link->out_formats))
122         avfilter_formats_changeref(&link->out_formats,
123                                    &filt->outputs[out]->out_formats);
124
125     return 0;
126 }
127
128 int avfilter_config_links(AVFilterContext *filter)
129 {
130     int (*config_link)(AVFilterLink *);
131     unsigned i;
132
133     for(i = 0; i < filter->input_count; i ++) {
134         AVFilterLink *link;
135
136         if(!(link = filter->inputs[i])) continue;
137
138         switch(link->init_state) {
139         case AVLINK_INIT:
140             continue;
141         case AVLINK_STARTINIT:
142             av_log(filter, AV_LOG_ERROR, "circular filter chain detected\n");
143             return -1;
144         case AVLINK_UNINIT:
145             link->init_state = AVLINK_STARTINIT;
146
147             if(avfilter_config_links(link->src))
148                 return -1;
149
150             if(!(config_link = link_spad(link).config_props))
151                 config_link  = avfilter_default_config_output_link;
152             if(config_link(link))
153                 return -1;
154
155             if((config_link = link_dpad(link).config_props))
156             if(config_link(link))
157                 return -1;
158
159             link->init_state = AVLINK_INIT;
160         }
161     }
162
163     return 0;
164 }
165
166 AVFilterPicRef *avfilter_get_video_buffer(AVFilterLink *link, int perms)
167 {
168     AVFilterPicRef *ret = NULL;
169
170     if(link_dpad(link).get_video_buffer)
171         ret = link_dpad(link).get_video_buffer(link, perms);
172
173     if(!ret)
174         ret = avfilter_default_get_video_buffer(link, perms);
175
176     return ret;
177 }
178
179 int avfilter_request_frame(AVFilterLink *link)
180 {
181     if(link_spad(link).request_frame)
182         return link_spad(link).request_frame(link);
183     else if(link->src->inputs[0])
184         return avfilter_request_frame(link->src->inputs[0]);
185     else return -1;
186 }
187
188 int avfilter_poll_frame(AVFilterLink *link)
189 {
190     int i, min=INT_MAX;
191
192     if(link_spad(link).poll_frame)
193         return link_spad(link).poll_frame(link);
194     else
195         for (i=0; i<link->src->input_count; i++) {
196             if(!link->src->inputs[i])
197                 return -1;
198             min = FFMIN(min, avfilter_poll_frame(link->src->inputs[i]));
199         }
200
201     return min;
202 }
203
204 /* XXX: should we do the duplicating of the picture ref here, instead of
205  * forcing the source filter to do it? */
206 void avfilter_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
207 {
208     void (*start_frame)(AVFilterLink *, AVFilterPicRef *);
209
210     if(!(start_frame = link_dpad(link).start_frame))
211         start_frame = avfilter_default_start_frame;
212
213     /* prepare to copy the picture if it has insufficient permissions */
214     if((link_dpad(link).min_perms & picref->perms) != link_dpad(link).min_perms ||
215         link_dpad(link).rej_perms & picref->perms) {
216         av_log(link->dst, AV_LOG_INFO,
217                 "frame copy needed (have perms %x, need %x, reject %x)\n",
218                 picref->perms,
219                 link_dpad(link).min_perms, link_dpad(link).rej_perms);
220
221         link->cur_pic = avfilter_default_get_video_buffer(link, link_dpad(link).min_perms);
222         link->srcpic = picref;
223     }
224     else
225         link->cur_pic = picref;
226
227     start_frame(link, link->cur_pic);
228 }
229
230 void avfilter_end_frame(AVFilterLink *link)
231 {
232     void (*end_frame)(AVFilterLink *);
233
234     /* unreference the source picture if we're feeding the destination filter
235      * a copied version dues to permission issues */
236     if(link->srcpic) {
237         avfilter_unref_pic(link->srcpic);
238         link->srcpic = NULL;
239     }
240
241     if(!(end_frame = link_dpad(link).end_frame))
242         end_frame = avfilter_default_end_frame;
243
244     end_frame(link);
245 }
246
247 void avfilter_draw_slice(AVFilterLink *link, int y, int h)
248 {
249     uint8_t *src[4], *dst[4];
250     int i, j, hsub, vsub;
251
252     /* copy the slice if needed for permission reasons */
253     if(link->srcpic) {
254         avcodec_get_chroma_sub_sample(link->format, &hsub, &vsub);
255
256         src[0] = link->srcpic-> data[0] + y * link->srcpic-> linesize[0];
257         dst[0] = link->cur_pic->data[0] + y * link->cur_pic->linesize[0];
258         for(i = 1; i < 4; i ++) {
259             if(link->srcpic->data[i]) {
260                 src[i] = link->srcpic-> data[i] + (y >> vsub) * link->srcpic-> linesize[i];
261                 dst[i] = link->cur_pic->data[i] + (y >> vsub) * link->cur_pic->linesize[i];
262             } else
263                 src[i] = dst[i] = NULL;
264         }
265         for(j = 0; j < h; j ++) {
266             memcpy(dst[0], src[0], link->cur_pic->linesize[0]);
267             src[0] += link->srcpic ->linesize[0];
268             dst[0] += link->cur_pic->linesize[0];
269         }
270         for(i = 1; i < 4; i ++) {
271             if(!src[i]) continue;
272
273             for(j = 0; j < h >> vsub; j ++) {
274                 memcpy(dst[i], src[i], link->cur_pic->linesize[i]);
275                 src[i] += link->srcpic ->linesize[i];
276                 dst[i] += link->cur_pic->linesize[i];
277             }
278         }
279     }
280
281     if(!link_dpad(link).draw_slice)
282         return;
283
284     link_dpad(link).draw_slice(link, y, h);
285 }
286
287 AVFilter *avfilter_get_by_name(char *name)
288 {
289     struct FilterList *filt;
290
291     for(filt = filters; filt; filt = filt->next)
292         if(!strcmp(filt->filter->name, name))
293             return filt->filter;
294
295     return NULL;
296 }
297
298 void avfilter_register(AVFilter *filter)
299 {
300     struct FilterList *newfilt = av_malloc(sizeof(struct FilterList));
301
302     newfilt->filter = filter;
303     newfilt->next   = filters;
304     filters         = newfilt;
305 }
306
307 void avfilter_init(void)
308 {
309     avfilter_register(&avfilter_vf_crop);
310     avfilter_register(&avfilter_vf_fifo);
311     avfilter_register(&avfilter_vf_format);
312     avfilter_register(&avfilter_vf_fps);
313     avfilter_register(&avfilter_vf_graph);
314     avfilter_register(&avfilter_vf_graphdesc);
315     avfilter_register(&avfilter_vf_graphfile);
316     avfilter_register(&avfilter_vf_hflip);
317     avfilter_register(&avfilter_vf_negate);
318     avfilter_register(&avfilter_vf_noformat);
319     avfilter_register(&avfilter_vf_overlay);
320     avfilter_register(&avfilter_vf_rotate);
321     avfilter_register(&avfilter_vf_scale);
322     avfilter_register(&avfilter_vf_setpts);
323     avfilter_register(&avfilter_vf_slicify);
324     avfilter_register(&avfilter_vf_split);
325     avfilter_register(&avfilter_vf_transpose);
326     avfilter_register(&avfilter_vf_vflip);
327 #ifdef CONFIG_AVFILTER_LAVF
328     avfilter_register(&avfilter_vsrc_movie);
329 #endif //CONFIG_AVFILTER_LAVF
330 }
331
332 void avfilter_uninit(void)
333 {
334     struct FilterList *tmp;
335
336     for(; filters; filters = tmp) {
337         tmp = filters->next;
338         av_free(filters);
339     }
340 }
341
342 static int pad_count(const AVFilterPad *pads)
343 {
344     AVFilterPad *p = (AVFilterPad *) pads;
345     int count;
346
347     for(count = 0; p->name; count ++) p ++;
348     return count;
349 }
350
351 static const char *filter_name(void *p)
352 {
353     AVFilterContext *filter = p;
354     return filter->filter->name;
355 }
356
357 AVFilterContext *avfilter_open(AVFilter *filter, char *inst_name)
358 {
359     AVFilterContext *ret;
360
361     if (!filter)
362         return 0;
363
364     ret = av_malloc(sizeof(AVFilterContext));
365
366     ret->av_class = av_mallocz(sizeof(AVClass));
367     ret->av_class->item_name = filter_name;
368     ret->filter   = filter;
369     ret->name     = inst_name ? av_strdup(inst_name) : NULL;
370     ret->priv     = av_mallocz(filter->priv_size);
371
372     ret->input_count  = pad_count(filter->inputs);
373     ret->input_pads   = av_malloc(sizeof(AVFilterPad) * ret->input_count);
374     memcpy(ret->input_pads, filter->inputs, sizeof(AVFilterPad)*ret->input_count);
375     ret->inputs       = av_mallocz(sizeof(AVFilterLink*) * ret->input_count);
376
377     ret->output_count = pad_count(filter->outputs);
378     ret->output_pads  = av_malloc(sizeof(AVFilterPad) * ret->output_count);
379     memcpy(ret->output_pads, filter->outputs, sizeof(AVFilterPad)*ret->output_count);
380     ret->outputs      = av_mallocz(sizeof(AVFilterLink*) * ret->output_count);
381
382     return ret;
383 }
384
385 void avfilter_destroy(AVFilterContext *filter)
386 {
387     int i;
388
389     if(filter->filter->uninit)
390         filter->filter->uninit(filter);
391
392     for(i = 0; i < filter->input_count; i ++) {
393         if(filter->inputs[i])
394             filter->inputs[i]->src->outputs[filter->inputs[i]->srcpad] = NULL;
395         av_freep(&filter->inputs[i]);
396     }
397     for(i = 0; i < filter->output_count; i ++) {
398         if(filter->outputs[i])
399             filter->outputs[i]->dst->inputs[filter->outputs[i]->dstpad] = NULL;
400         av_freep(&filter->outputs[i]);
401     }
402
403     av_freep(&filter->name);
404     av_freep(&filter->input_pads);
405     av_freep(&filter->output_pads);
406     av_freep(&filter->inputs);
407     av_freep(&filter->outputs);
408     av_freep(&filter->priv);
409     av_freep(&filter->av_class);
410     av_free(filter);
411 }
412
413 int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque)
414 {
415     int ret;
416
417     if(filter->filter->init)
418         if((ret = filter->filter->init(filter, args, opaque))) return ret;
419     return 0;
420 }
421