Add a filter to output the same video to two outputs
[libav.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_config_link(AVFilterLink *link)
100 {
101 int *fmts[2], i, j;
102 int (*config_link)(AVFilterLink *);
103 int *(*query_formats)(AVFilterLink *link);
104
105 if(!link)
106 return 0;
107
108 /* find a format both filters support - TODO: auto-insert conversion filter */
109 link->format = -1;
110 if(!(query_formats = link_spad(link).query_formats))
111 query_formats = avfilter_default_query_output_formats;
112 fmts[0] = query_formats(link);
113 fmts[1] = link_dpad(link).query_formats(link);
114 for(i = 0; fmts[0][i] != -1; i ++)
115 for(j = 0; fmts[1][j] != -1; j ++)
116 if(fmts[0][i] == fmts[1][j]) {
117 link->format = fmts[0][i];
118 goto format_done;
119 }
120
121 format_done:
122 av_free(fmts[0]);
123 av_free(fmts[1]);
124 if(link->format == -1)
125 return -1;
126
127 if(!(config_link = link_spad(link).config_props))
128 config_link = avfilter_default_config_output_link;
129 if(config_link(link))
130 return -1;
131
132 if(!(config_link = link_dpad(link).config_props))
133 config_link = avfilter_default_config_input_link;
134 if(config_link(link))
135 return -1;
136
137 return 0;
138 }
139
140 AVFilterPicRef *avfilter_get_video_buffer(AVFilterLink *link, int perms)
141 {
142 AVFilterPicRef *ret = NULL;
143
144 if(link_dpad(link).get_video_buffer)
145 ret = link_dpad(link).get_video_buffer(link, perms);
146
147 if(!ret)
148 ret = avfilter_default_get_video_buffer(link, perms);
149
150 return ret;
151 }
152
153 int avfilter_request_frame(AVFilterLink *link)
154 {
155 if(link_spad(link).request_frame)
156 return link_spad(link).request_frame(link);
157 else if(link->src->inputs[0])
158 return avfilter_request_frame(link->src->inputs[0]);
159 else return -1;
160 }
161
162 /* XXX: should we do the duplicating of the picture ref here, instead of
163 * forcing the source filter to do it? */
164 void avfilter_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
165 {
166 void (*start_frame)(AVFilterLink *, AVFilterPicRef *);
167
168 if(!(start_frame = link_dpad(link).start_frame))
169 start_frame = avfilter_default_start_frame;
170
171 /* prepare to copy the picture if it has insufficient permissions */
172 if((link_dpad(link).min_perms & picref->perms) != link_dpad(link).min_perms ||
173 link_dpad(link).rej_perms & picref->perms) {
174 av_log(link->dst, AV_LOG_INFO,
175 "frame copy needed (have perms %x, need %x, reject %x)\n",
176 picref->perms,
177 link_dpad(link).min_perms, link_dpad(link).rej_perms);
178
179 link->cur_pic = avfilter_default_get_video_buffer(link, link_dpad(link).min_perms);
180 link->srcpic = picref;
181 }
182 else
183 link->cur_pic = picref;
184
185 start_frame(link, link->cur_pic);
186 }
187
188 void avfilter_end_frame(AVFilterLink *link)
189 {
190 void (*end_frame)(AVFilterLink *);
191
192 /* unreference the source picture if we're feeding the destination filter
193 * a copied version dues to permission issues */
194 if(link->srcpic) {
195 avfilter_unref_pic(link->srcpic);
196 link->srcpic = NULL;
197 }
198
199 if(!(end_frame = link_dpad(link).end_frame))
200 end_frame = avfilter_default_end_frame;
201
202 end_frame(link);
203 }
204
205 void avfilter_draw_slice(AVFilterLink *link, int y, int h)
206 {
207 uint8_t *src[4], *dst[4];
208 int i, j, hsub, vsub;
209
210 /* copy the slice if needed for permission reasons */
211 if(link->srcpic) {
212 avcodec_get_chroma_sub_sample(link->format, &hsub, &vsub);
213
214 src[0] = link->srcpic-> data[0] + y * link->srcpic-> linesize[0];
215 dst[0] = link->cur_pic->data[0] + y * link->cur_pic->linesize[0];
216 for(i = 1; i < 4; i ++) {
217 if(link->srcpic->data[i]) {
218 src[i] = link->srcpic-> data[i] + (y >> vsub) * link->srcpic-> linesize[i];
219 dst[i] = link->cur_pic->data[i] + (y >> vsub) * link->cur_pic->linesize[i];
220 } else
221 src[i] = dst[i] = NULL;
222 }
223 for(j = 0; j < h; j ++) {
224 memcpy(dst[0], src[0], link->cur_pic->linesize[0]);
225 src[0] += link->srcpic ->linesize[0];
226 dst[0] += link->cur_pic->linesize[0];
227 }
228 for(i = 1; i < 4; i ++) {
229 if(!src[i]) continue;
230
231 for(j = 0; j < h >> vsub; j ++) {
232 memcpy(dst[i], src[i], link->cur_pic->linesize[i]);
233 src[i] += link->srcpic ->linesize[i];
234 dst[i] += link->cur_pic->linesize[i];
235 }
236 }
237 }
238
239 if(!link_dpad(link).draw_slice)
240 return;
241
242 link_dpad(link).draw_slice(link, y, h);
243 }
244
245 AVFilter *avfilter_get_by_name(char *name)
246 {
247 struct FilterList *filt;
248
249 for(filt = filters; filt; filt = filt->next)
250 if(!strcmp(filt->filter->name, name))
251 return filt->filter;
252
253 return NULL;
254 }
255
256 /* FIXME: insert in order, rather than insert at end + resort */
257 void avfilter_register(AVFilter *filter)
258 {
259 struct FilterList *newfilt = av_malloc(sizeof(struct FilterList));
260
261 newfilt->filter = filter;
262 newfilt->next = filters;
263 filters = newfilt;
264 }
265
266 void avfilter_init(void)
267 {
268 avfilter_register(&vsrc_dummy);
269 avfilter_register(&vsrc_ppm);
270 avfilter_register(&vf_buffer);
271 avfilter_register(&vf_crop);
272 avfilter_register(&vf_fps);
273 avfilter_register(&vf_graph);
274 avfilter_register(&vf_graphdesc);
275 avfilter_register(&vf_graphfile);
276 avfilter_register(&vf_overlay);
277 avfilter_register(&vf_passthrough);
278 avfilter_register(&vf_rgb2bgr);
279 avfilter_register(&vf_slicify);
280 avfilter_register(&vf_split);
281 avfilter_register(&vf_vflip);
282 }
283
284 void avfilter_uninit(void)
285 {
286 struct FilterList *tmp;
287
288 for(; filters; filters = tmp) {
289 tmp = filters->next;
290 av_free(filters);
291 }
292 }
293
294 static int pad_count(const AVFilterPad *pads)
295 {
296 AVFilterPad *p = (AVFilterPad *) pads;
297 int count;
298
299 for(count = 0; p->name; count ++) p ++;
300 return count;
301 }
302
303 static const char *filter_name(void *p)
304 {
305 AVFilterContext *filter = p;
306 return filter->filter->name;
307 }
308
309 AVFilterContext *avfilter_open(AVFilter *filter, char *inst_name)
310 {
311 AVFilterContext *ret = av_malloc(sizeof(AVFilterContext));
312
313 ret->av_class = av_mallocz(sizeof(AVClass));
314 ret->av_class->item_name = filter_name;
315 ret->filter = filter;
316 ret->name = inst_name ? av_strdup(inst_name) : NULL;
317 ret->priv = av_mallocz(filter->priv_size);
318
319 ret->input_count = pad_count(filter->inputs);
320 ret->input_pads = av_malloc(sizeof(AVFilterPad) * ret->input_count);
321 memcpy(ret->input_pads, filter->inputs, sizeof(AVFilterPad)*ret->input_count);
322 ret->inputs = av_mallocz(sizeof(AVFilterLink*) * ret->input_count);
323
324 ret->output_count = pad_count(filter->outputs);
325 ret->output_pads = av_malloc(sizeof(AVFilterPad) * ret->output_count);
326 memcpy(ret->output_pads, filter->outputs, sizeof(AVFilterPad)*ret->output_count);
327 ret->outputs = av_mallocz(sizeof(AVFilterLink*) * ret->output_count);
328
329 return ret;
330 }
331
332 void avfilter_destroy(AVFilterContext *filter)
333 {
334 int i;
335
336 if(filter->filter->uninit)
337 filter->filter->uninit(filter);
338
339 for(i = 0; i < filter->input_count; i ++) {
340 if(filter->inputs[i])
341 filter->inputs[i]->src->outputs[filter->inputs[i]->srcpad] = NULL;
342 av_freep(&filter->inputs[i]);
343 }
344 for(i = 0; i < filter->output_count; i ++) {
345 if(filter->outputs[i])
346 filter->outputs[i]->dst->inputs[filter->outputs[i]->dstpad] = NULL;
347 av_freep(&filter->outputs[i]);
348 }
349
350 av_freep(&filter->name);
351 av_freep(&filter->input_pads);
352 av_freep(&filter->output_pads);
353 av_freep(&filter->inputs);
354 av_freep(&filter->outputs);
355 av_freep(&filter->priv);
356 av_freep(&filter->av_class);
357 av_free(filter);
358 }
359
360 int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque)
361 {
362 int ret;
363
364 if(filter->filter->init)
365 if((ret = filter->filter->init(filter, args, opaque))) return ret;
366 return 0;
367 }
368
369 int *avfilter_make_format_list(int len, ...)
370 {
371 int *ret, i;
372 va_list vl;
373
374 ret = av_malloc(sizeof(int) * (len + 1));
375 va_start(vl, len);
376 for(i = 0; i < len; i ++)
377 ret[i] = va_arg(vl, int);
378 va_end(vl);
379 ret[len] = -1;
380
381 return ret;
382 }
383