Add const to silence warnings
[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_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 /*
217 av_log(link->dst, AV_LOG_INFO,
218 "frame copy needed (have perms %x, need %x, reject %x)\n",
219 picref->perms,
220 link_dpad(link).min_perms, link_dpad(link).rej_perms);
221 */
222
223 link->cur_pic = avfilter_default_get_video_buffer(link, link_dpad(link).min_perms);
224 link->srcpic = picref;
225 }
226 else
227 link->cur_pic = picref;
228
229 start_frame(link, link->cur_pic);
230 }
231
232 void avfilter_end_frame(AVFilterLink *link)
233 {
234 void (*end_frame)(AVFilterLink *);
235
236 if(!(end_frame = link_dpad(link).end_frame))
237 end_frame = avfilter_default_end_frame;
238
239 end_frame(link);
240
241 /* unreference the source picture if we're feeding the destination filter
242 * a copied version dues to permission issues */
243 if(link->srcpic) {
244 avfilter_unref_pic(link->srcpic);
245 link->srcpic = NULL;
246 }
247
248 }
249
250 void avfilter_draw_slice(AVFilterLink *link, int y, int h)
251 {
252 uint8_t *src[4], *dst[4];
253 int i, j, hsub, vsub;
254
255 /* copy the slice if needed for permission reasons */
256 if(link->srcpic) {
257 avcodec_get_chroma_sub_sample(link->format, &hsub, &vsub);
258
259 link->cur_pic->pts = link->srcpic->pts;
260 src[0] = link->srcpic-> data[0] + y * link->srcpic-> linesize[0];
261 dst[0] = link->cur_pic->data[0] + y * link->cur_pic->linesize[0];
262 for(i = 1; i < 4; i ++) {
263 if(link->srcpic->data[i]) {
264 src[i] = link->srcpic-> data[i] + (y >> vsub) * link->srcpic-> linesize[i];
265 dst[i] = link->cur_pic->data[i] + (y >> vsub) * link->cur_pic->linesize[i];
266 } else
267 src[i] = dst[i] = NULL;
268 }
269 for(j = 0; j < h; j ++) {
270 memcpy(dst[0], src[0], link->cur_pic->linesize[0]);
271 src[0] += link->srcpic ->linesize[0];
272 dst[0] += link->cur_pic->linesize[0];
273 }
274 for(i = 1; i < 4; i ++) {
275 if(!src[i]) continue;
276
277 for(j = 0; j < h >> vsub; j ++) {
278 memcpy(dst[i], src[i], link->cur_pic->linesize[i]);
279 src[i] += link->srcpic ->linesize[i];
280 dst[i] += link->cur_pic->linesize[i];
281 }
282 }
283 }
284
285 if(!link_dpad(link).draw_slice)
286 return;
287
288 link_dpad(link).draw_slice(link, y, h);
289 }
290
291 AVFilter *avfilter_get_by_name(const char *name)
292 {
293 struct FilterList *filt;
294
295 for(filt = filters; filt; filt = filt->next)
296 if(!strcmp(filt->filter->name, name))
297 return filt->filter;
298
299 return NULL;
300 }
301
302 void avfilter_register(AVFilter *filter)
303 {
304 struct FilterList *newfilt = av_malloc(sizeof(struct FilterList));
305
306 newfilt->filter = filter;
307 newfilt->next = filters;
308 filters = newfilt;
309 }
310
311 void avfilter_init(void)
312 {
313 avfilter_register(&avfilter_vf_crop);
314 avfilter_register(&avfilter_vf_fifo);
315 avfilter_register(&avfilter_vf_format);
316 avfilter_register(&avfilter_vf_fps);
317 avfilter_register(&avfilter_vf_graph);
318 avfilter_register(&avfilter_vf_graphdesc);
319 avfilter_register(&avfilter_vf_graphfile);
320 avfilter_register(&avfilter_vf_hflip);
321 avfilter_register(&avfilter_vf_negate);
322 avfilter_register(&avfilter_vf_noformat);
323 avfilter_register(&avfilter_vf_overlay);
324 avfilter_register(&avfilter_vf_rotate);
325 avfilter_register(&avfilter_vf_scale);
326 avfilter_register(&avfilter_vf_setpts);
327 avfilter_register(&avfilter_vf_slicify);
328 avfilter_register(&avfilter_vf_split);
329 avfilter_register(&avfilter_vf_transpose);
330 avfilter_register(&avfilter_vf_vflip);
331 #ifdef CONFIG_AVFILTER_LAVF
332 avfilter_register(&avfilter_vsrc_movie);
333 #endif //CONFIG_AVFILTER_LAVF
334 }
335
336 void avfilter_uninit(void)
337 {
338 struct FilterList *tmp;
339
340 for(; filters; filters = tmp) {
341 tmp = filters->next;
342 av_free(filters);
343 }
344 }
345
346 static int pad_count(const AVFilterPad *pads)
347 {
348 int count;
349
350 for(count = 0; pads->name; count ++) pads ++;
351 return count;
352 }
353
354 static const char *filter_name(void *p)
355 {
356 AVFilterContext *filter = p;
357 return filter->filter->name;
358 }
359
360 AVFilterContext *avfilter_open(AVFilter *filter, const char *inst_name)
361 {
362 AVFilterContext *ret;
363
364 if (!filter)
365 return 0;
366
367 ret = av_malloc(sizeof(AVFilterContext));
368
369 ret->av_class = av_mallocz(sizeof(AVClass));
370 ret->av_class->item_name = filter_name;
371 ret->filter = filter;
372 ret->name = inst_name ? av_strdup(inst_name) : NULL;
373 ret->priv = av_mallocz(filter->priv_size);
374
375 ret->input_count = pad_count(filter->inputs);
376 ret->input_pads = av_malloc(sizeof(AVFilterPad) * ret->input_count);
377 memcpy(ret->input_pads, filter->inputs, sizeof(AVFilterPad)*ret->input_count);
378 ret->inputs = av_mallocz(sizeof(AVFilterLink*) * ret->input_count);
379
380 ret->output_count = pad_count(filter->outputs);
381 ret->output_pads = av_malloc(sizeof(AVFilterPad) * ret->output_count);
382 memcpy(ret->output_pads, filter->outputs, sizeof(AVFilterPad)*ret->output_count);
383 ret->outputs = av_mallocz(sizeof(AVFilterLink*) * ret->output_count);
384
385 return ret;
386 }
387
388 void avfilter_destroy(AVFilterContext *filter)
389 {
390 int i;
391
392 if(filter->filter->uninit)
393 filter->filter->uninit(filter);
394
395 for(i = 0; i < filter->input_count; i ++) {
396 if(filter->inputs[i])
397 filter->inputs[i]->src->outputs[filter->inputs[i]->srcpad] = NULL;
398 av_freep(&filter->inputs[i]);
399 }
400 for(i = 0; i < filter->output_count; i ++) {
401 if(filter->outputs[i])
402 filter->outputs[i]->dst->inputs[filter->outputs[i]->dstpad] = NULL;
403 av_freep(&filter->outputs[i]);
404 }
405
406 av_freep(&filter->name);
407 av_freep(&filter->input_pads);
408 av_freep(&filter->output_pads);
409 av_freep(&filter->inputs);
410 av_freep(&filter->outputs);
411 av_freep(&filter->priv);
412 av_freep(&filter->av_class);
413 av_free(filter);
414 }
415
416 int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque)
417 {
418 int ret;
419
420 if(filter->filter->init)
421 if((ret = filter->filter->init(filter, args, opaque))) return ret;
422 return 0;
423 }
424