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