Merge loops
[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 "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))
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 = filter->inputs[i];
130
131 if(!link) 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
265 for(i = 0; i < 4; i ++) {
266 if(!src[i]) continue;
267
268 for(j = 0; j < h >> (i==0 ? 0 : vsub); j ++) {
269 memcpy(dst[i], src[i], link->cur_pic->linesize[i]);
270 src[i] += link->srcpic ->linesize[i];
271 dst[i] += link->cur_pic->linesize[i];
272 }
273 }
274 }
275
276 if(!link_dpad(link).draw_slice)
277 return;
278
279 link_dpad(link).draw_slice(link, y, h);
280 }
281
282 AVFilter *avfilter_get_by_name(const char *name)
283 {
284 struct FilterList *filt;
285
286 for(filt = filters; filt; filt = filt->next)
287 if(!strcmp(filt->filter->name, name))
288 return filt->filter;
289
290 return NULL;
291 }
292
293 void avfilter_register(AVFilter *filter)
294 {
295 struct FilterList *newfilt = av_malloc(sizeof(struct FilterList));
296
297 newfilt->filter = filter;
298 newfilt->next = filters;
299 filters = newfilt;
300 }
301
302 void avfilter_init(void)
303 {
304 avfilter_register(&avfilter_vf_crop);
305 avfilter_register(&avfilter_vf_fifo);
306 avfilter_register(&avfilter_vf_format);
307 avfilter_register(&avfilter_vf_fps);
308 avfilter_register(&avfilter_vf_graph);
309 avfilter_register(&avfilter_vf_graphdesc);
310 avfilter_register(&avfilter_vf_graphfile);
311 avfilter_register(&avfilter_vf_hflip);
312 avfilter_register(&avfilter_vf_negate);
313 avfilter_register(&avfilter_vf_noformat);
314 avfilter_register(&avfilter_vf_overlay);
315 avfilter_register(&avfilter_vf_rotate);
316 avfilter_register(&avfilter_vf_scale);
317 avfilter_register(&avfilter_vf_setpts);
318 avfilter_register(&avfilter_vf_slicify);
319 avfilter_register(&avfilter_vf_split);
320 avfilter_register(&avfilter_vf_transpose);
321 avfilter_register(&avfilter_vf_vflip);
322 #ifdef CONFIG_AVFILTER_LAVF
323 avfilter_register(&avfilter_vsrc_movie);
324 #endif //CONFIG_AVFILTER_LAVF
325 }
326
327 void avfilter_uninit(void)
328 {
329 struct FilterList *tmp;
330
331 for(; filters; filters = tmp) {
332 tmp = filters->next;
333 av_free(filters);
334 }
335 }
336
337 static int pad_count(const AVFilterPad *pads)
338 {
339 int count;
340
341 for(count = 0; pads->name; count ++) pads ++;
342 return count;
343 }
344
345 static const char *filter_name(void *p)
346 {
347 AVFilterContext *filter = p;
348 return filter->filter->name;
349 }
350
351 AVFilterContext *avfilter_open(AVFilter *filter, const char *inst_name)
352 {
353 AVFilterContext *ret;
354
355 if (!filter)
356 return 0;
357
358 ret = av_malloc(sizeof(AVFilterContext));
359
360 ret->av_class = av_mallocz(sizeof(AVClass));
361 ret->av_class->item_name = filter_name;
362 ret->filter = filter;
363 ret->name = inst_name ? av_strdup(inst_name) : NULL;
364 ret->priv = av_mallocz(filter->priv_size);
365
366 ret->input_count = pad_count(filter->inputs);
367 ret->input_pads = av_malloc(sizeof(AVFilterPad) * ret->input_count);
368 memcpy(ret->input_pads, filter->inputs, sizeof(AVFilterPad)*ret->input_count);
369 ret->inputs = av_mallocz(sizeof(AVFilterLink*) * ret->input_count);
370
371 ret->output_count = pad_count(filter->outputs);
372 ret->output_pads = av_malloc(sizeof(AVFilterPad) * ret->output_count);
373 memcpy(ret->output_pads, filter->outputs, sizeof(AVFilterPad)*ret->output_count);
374 ret->outputs = av_mallocz(sizeof(AVFilterLink*) * ret->output_count);
375
376 return ret;
377 }
378
379 void avfilter_destroy(AVFilterContext *filter)
380 {
381 int i;
382
383 if(filter->filter->uninit)
384 filter->filter->uninit(filter);
385
386 for(i = 0; i < filter->input_count; i ++) {
387 if(filter->inputs[i])
388 filter->inputs[i]->src->outputs[filter->inputs[i]->srcpad] = NULL;
389 av_freep(&filter->inputs[i]);
390 }
391 for(i = 0; i < filter->output_count; i ++) {
392 if(filter->outputs[i])
393 filter->outputs[i]->dst->inputs[filter->outputs[i]->dstpad] = NULL;
394 av_freep(&filter->outputs[i]);
395 }
396
397 av_freep(&filter->name);
398 av_freep(&filter->input_pads);
399 av_freep(&filter->output_pads);
400 av_freep(&filter->inputs);
401 av_freep(&filter->outputs);
402 av_freep(&filter->priv);
403 av_freep(&filter->av_class);
404 av_free(filter);
405 }
406
407 int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque)
408 {
409 int ret=0;
410
411 if(filter->filter->init)
412 ret = filter->filter->init(filter, args, opaque);
413 return ret;
414 }
415