79c4cc07b762af3001ccb663737a70a23ef710ce
[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 av_log(link->dst, AV_LOG_INFO, "auto-inserting filter '%s'\n",
98 filt->filter->name);
99
100 link->dst->inputs[link->dstpad] = NULL;
101 if(avfilter_link(filt, out, link->dst, link->dstpad)) {
102 /* failed to link output filter to new filter */
103 link->dst->inputs[link->dstpad] = link;
104 return -1;
105 }
106
107 /* re-hookup the link to the new destination filter we inserted */
108 link->dst = filt;
109 link->dstpad = in;
110 filt->inputs[in] = link;
111
112 /* if any information on supported colorspaces already exists on the
113 * link, we need to preserve that */
114 if(link->out_formats)
115 avfilter_formats_changeref(&link->out_formats,
116 &filt->outputs[out]->out_formats);
117
118 return 0;
119 }
120
121 int avfilter_config_links(AVFilterContext *filter)
122 {
123 int (*config_link)(AVFilterLink *);
124 unsigned i;
125
126 for(i = 0; i < filter->input_count; i ++) {
127 AVFilterLink *link = filter->inputs[i];
128
129 if(!link) continue;
130
131 switch(link->init_state) {
132 case AVLINK_INIT:
133 continue;
134 case AVLINK_STARTINIT:
135 av_log(filter, AV_LOG_INFO, "circular filter chain detected\n");
136 return 0;
137 case AVLINK_UNINIT:
138 link->init_state = AVLINK_STARTINIT;
139
140 if(avfilter_config_links(link->src))
141 return -1;
142
143 if(!(config_link = link_spad(link).config_props))
144 config_link = avfilter_default_config_output_link;
145 if(config_link(link))
146 return -1;
147
148 if((config_link = link_dpad(link).config_props))
149 if(config_link(link))
150 return -1;
151
152 link->init_state = AVLINK_INIT;
153 }
154 }
155
156 return 0;
157 }
158
159 AVFilterPicRef *avfilter_get_video_buffer(AVFilterLink *link, int perms)
160 {
161 AVFilterPicRef *ret = NULL;
162
163 if(link_dpad(link).get_video_buffer)
164 ret = link_dpad(link).get_video_buffer(link, perms);
165
166 if(!ret)
167 ret = avfilter_default_get_video_buffer(link, perms);
168
169 return ret;
170 }
171
172 int avfilter_request_frame(AVFilterLink *link)
173 {
174 if(link_spad(link).request_frame)
175 return link_spad(link).request_frame(link);
176 else if(link->src->inputs[0])
177 return avfilter_request_frame(link->src->inputs[0]);
178 else return -1;
179 }
180
181 int avfilter_poll_frame(AVFilterLink *link)
182 {
183 int i, min=INT_MAX;
184
185 if(link_spad(link).poll_frame)
186 return link_spad(link).poll_frame(link);
187
188 for (i=0; i<link->src->input_count; i++) {
189 if(!link->src->inputs[i])
190 return -1;
191 min = FFMIN(min, avfilter_poll_frame(link->src->inputs[i]));
192 }
193
194 return min;
195 }
196
197 /* XXX: should we do the duplicating of the picture ref here, instead of
198 * forcing the source filter to do it? */
199 void avfilter_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
200 {
201 void (*start_frame)(AVFilterLink *, AVFilterPicRef *);
202 AVFilterPad *dst = &link_dpad(link);
203
204 if(!(start_frame = dst->start_frame))
205 start_frame = avfilter_default_start_frame;
206
207 /* prepare to copy the picture if it has insufficient permissions */
208 if((dst->min_perms & picref->perms) != dst->min_perms ||
209 dst->rej_perms & picref->perms) {
210 /*
211 av_log(link->dst, AV_LOG_INFO,
212 "frame copy needed (have perms %x, need %x, reject %x)\n",
213 picref->perms,
214 link_dpad(link).min_perms, link_dpad(link).rej_perms);
215 */
216
217 link->cur_pic = avfilter_default_get_video_buffer(link, dst->min_perms);
218 link->srcpic = picref;
219 link->cur_pic->pts = link->srcpic->pts;
220 }
221 else
222 link->cur_pic = picref;
223
224 start_frame(link, link->cur_pic);
225 }
226
227 void avfilter_end_frame(AVFilterLink *link)
228 {
229 void (*end_frame)(AVFilterLink *);
230
231 if(!(end_frame = link_dpad(link).end_frame))
232 end_frame = avfilter_default_end_frame;
233
234 end_frame(link);
235
236 /* unreference the source picture if we're feeding the destination filter
237 * a copied version dues to permission issues */
238 if(link->srcpic) {
239 avfilter_unref_pic(link->srcpic);
240 link->srcpic = NULL;
241 }
242
243 }
244
245 void avfilter_draw_slice(AVFilterLink *link, int y, int h)
246 {
247 uint8_t *src[4], *dst[4];
248 int i, j, hsub, vsub;
249
250 /* copy the slice if needed for permission reasons */
251 if(link->srcpic) {
252 avcodec_get_chroma_sub_sample(link->format, &hsub, &vsub);
253
254 for(i = 0; i < 4; i ++) {
255 if(link->srcpic->data[i]) {
256 src[i] = link->srcpic-> data[i] +
257 (y >> (i==0 ? 0 : vsub)) * link->srcpic-> linesize[i];
258 dst[i] = link->cur_pic->data[i] +
259 (y >> (i==0 ? 0 : vsub)) * link->cur_pic->linesize[i];
260 } else
261 src[i] = dst[i] = NULL;
262 }
263
264 for(i = 0; i < 4; i ++) {
265 if(!src[i]) continue;
266
267 for(j = 0; j < h >> (i==0 ? 0 : vsub); j ++) {
268 memcpy(dst[i], src[i], link->cur_pic->linesize[i]);
269 src[i] += link->srcpic ->linesize[i];
270 dst[i] += link->cur_pic->linesize[i];
271 }
272 }
273 }
274
275 if(link_dpad(link).draw_slice)
276 link_dpad(link).draw_slice(link, y, h);
277 }
278
279 AVFilter *avfilter_get_by_name(const char *name)
280 {
281 struct FilterList *filt;
282
283 for(filt = filters; filt; filt = filt->next)
284 if(!strcmp(filt->filter->name, name))
285 return filt->filter;
286
287 return NULL;
288 }
289
290 void avfilter_register(AVFilter *filter)
291 {
292 struct FilterList *newfilt = av_malloc(sizeof(struct FilterList));
293
294 newfilt->filter = filter;
295 newfilt->next = filters;
296 filters = newfilt;
297 }
298
299 void avfilter_uninit(void)
300 {
301 struct FilterList *tmp;
302
303 for(; filters; filters = tmp) {
304 tmp = filters->next;
305 av_free(filters);
306 }
307 }
308
309 static int pad_count(const AVFilterPad *pads)
310 {
311 int count;
312
313 for(count = 0; pads->name; count ++) pads ++;
314 return count;
315 }
316
317 static const char *filter_name(void *p)
318 {
319 AVFilterContext *filter = p;
320 return filter->filter->name;
321 }
322
323 AVFilterContext *avfilter_open(AVFilter *filter, const char *inst_name)
324 {
325 AVFilterContext *ret;
326
327 if (!filter)
328 return 0;
329
330 ret = av_malloc(sizeof(AVFilterContext));
331
332 ret->av_class = av_mallocz(sizeof(AVClass));
333 ret->av_class->item_name = filter_name;
334 ret->filter = filter;
335 ret->name = inst_name ? av_strdup(inst_name) : NULL;
336 ret->priv = av_mallocz(filter->priv_size);
337
338 ret->input_count = pad_count(filter->inputs);
339 ret->input_pads = av_malloc(sizeof(AVFilterPad) * ret->input_count);
340 memcpy(ret->input_pads, filter->inputs, sizeof(AVFilterPad)*ret->input_count);
341 ret->inputs = av_mallocz(sizeof(AVFilterLink*) * ret->input_count);
342
343 ret->output_count = pad_count(filter->outputs);
344 ret->output_pads = av_malloc(sizeof(AVFilterPad) * ret->output_count);
345 memcpy(ret->output_pads, filter->outputs, sizeof(AVFilterPad)*ret->output_count);
346 ret->outputs = av_mallocz(sizeof(AVFilterLink*) * ret->output_count);
347
348 return ret;
349 }
350
351 void avfilter_destroy(AVFilterContext *filter)
352 {
353 int i;
354
355 if(filter->filter->uninit)
356 filter->filter->uninit(filter);
357
358 for(i = 0; i < filter->input_count; i ++) {
359 if(filter->inputs[i])
360 filter->inputs[i]->src->outputs[filter->inputs[i]->srcpad] = NULL;
361 av_freep(&filter->inputs[i]);
362 }
363 for(i = 0; i < filter->output_count; i ++) {
364 if(filter->outputs[i])
365 filter->outputs[i]->dst->inputs[filter->outputs[i]->dstpad] = NULL;
366 av_freep(&filter->outputs[i]);
367 }
368
369 av_freep(&filter->name);
370 av_freep(&filter->input_pads);
371 av_freep(&filter->output_pads);
372 av_freep(&filter->inputs);
373 av_freep(&filter->outputs);
374 av_freep(&filter->priv);
375 av_freep(&filter->av_class);
376 av_free(filter);
377 }
378
379 int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque)
380 {
381 int ret=0;
382
383 if(filter->filter->init)
384 ret = filter->filter->init(filter, args, opaque);
385 return ret;
386 }
387