760c01acf35089dcb0581310c00092ef95f119c1
[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 static int common_format(int *fmts0, int *fmts1)
100 {
101 int i, j;
102
103 for(i = 0; fmts0[i] != -1; i ++)
104 for(j = 0; fmts1[j] != -1; j ++)
105 if(fmts0[i] == fmts1[j])
106 return fmts0[i];
107
108 return -1;
109 }
110
111 int avfilter_config_link(AVFilterLink *link)
112 {
113 int *fmts[3] = {NULL,NULL,NULL};
114 int (*config_link)(AVFilterLink *);
115 int *(*query_formats)(AVFilterLink *link);
116
117 AVFilterContext *scale;
118 AVFilterLink *link2 = NULL;
119
120 if(!link)
121 return 0;
122
123 /* find a format both filters support */
124 if(!(query_formats = link_spad(link).query_formats))
125 query_formats = avfilter_default_query_output_formats;
126 fmts[0] = query_formats(link);
127 fmts[1] = link_dpad(link).query_formats(link);
128 if((link->format = common_format(fmts[0], fmts[1])) == -1) {
129 /* no common format found. insert scale filter to convert */
130 if(!(scale = avfilter_open(&avfilter_vf_scale, NULL)))
131 goto format_done;
132 if(scale->filter->init(scale, NULL, NULL)) {
133 avfilter_destroy(scale);
134 goto format_done;
135 }
136
137 link->dst->inputs[link->dstpad] = NULL;
138 if(avfilter_link(scale, 0, link->dst, link->dstpad)) {
139 link->dst->inputs[link->dstpad] = link;
140 goto format_done;
141 }
142 link2 = scale->outputs[0];
143 link->dst = scale;
144 link->dstpad = 0;
145 scale->inputs[0] = link;
146
147 /* now try again to find working colorspaces.
148 * XXX: is it safe to assume that the scale filter always supports the
149 * same input and output colorspaces? */
150 fmts[2] = scale->input_pads[0].query_formats(link);
151 link->format = common_format(fmts[0], fmts[2]);
152 link2->format = common_format(fmts[1], fmts[2]);
153 }
154
155 format_done:
156 av_free(fmts[0]);
157 av_free(fmts[1]);
158 av_free(fmts[2]);
159 if(link->format == -1 || (link2 && link2->format == -1)) {
160 if(link2) {
161 link->dst = link2->dst;
162 link->dstpad = link2->dstpad;
163 link->dst->inputs[link->dstpad] = link;
164 link->format = -1;
165 avfilter_destroy(scale);
166 av_free(link2);
167 }
168 return -1;
169 }
170
171 if(!(config_link = link_spad(link).config_props))
172 config_link = avfilter_default_config_output_link;
173 if(config_link(link))
174 return -1;
175
176 if(!(config_link = link_dpad(link).config_props))
177 config_link = avfilter_default_config_input_link;
178 if(config_link(link))
179 return -1;
180
181 if(link2) {
182 if(!(config_link = link_spad(link2).config_props))
183 config_link = avfilter_default_config_output_link;
184 if(config_link(link2))
185 return -1;
186
187 if(!(config_link = link_dpad(link2).config_props))
188 config_link = avfilter_default_config_input_link;
189 if(config_link(link2))
190 return -1;
191 }
192
193 return 0;
194 }
195
196 AVFilterPicRef *avfilter_get_video_buffer(AVFilterLink *link, int perms)
197 {
198 AVFilterPicRef *ret = NULL;
199
200 if(link_dpad(link).get_video_buffer)
201 ret = link_dpad(link).get_video_buffer(link, perms);
202
203 if(!ret)
204 ret = avfilter_default_get_video_buffer(link, perms);
205
206 return ret;
207 }
208
209 int avfilter_request_frame(AVFilterLink *link)
210 {
211 if(link_spad(link).request_frame)
212 return link_spad(link).request_frame(link);
213 else if(link->src->inputs[0])
214 return avfilter_request_frame(link->src->inputs[0]);
215 else return -1;
216 }
217
218 /* XXX: should we do the duplicating of the picture ref here, instead of
219 * forcing the source filter to do it? */
220 void avfilter_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
221 {
222 void (*start_frame)(AVFilterLink *, AVFilterPicRef *);
223
224 if(!(start_frame = link_dpad(link).start_frame))
225 start_frame = avfilter_default_start_frame;
226
227 /* prepare to copy the picture if it has insufficient permissions */
228 if((link_dpad(link).min_perms & picref->perms) != link_dpad(link).min_perms ||
229 link_dpad(link).rej_perms & picref->perms) {
230 av_log(link->dst, AV_LOG_INFO,
231 "frame copy needed (have perms %x, need %x, reject %x)\n",
232 picref->perms,
233 link_dpad(link).min_perms, link_dpad(link).rej_perms);
234
235 link->cur_pic = avfilter_default_get_video_buffer(link, link_dpad(link).min_perms);
236 link->srcpic = picref;
237 }
238 else
239 link->cur_pic = picref;
240
241 start_frame(link, link->cur_pic);
242 }
243
244 void avfilter_end_frame(AVFilterLink *link)
245 {
246 void (*end_frame)(AVFilterLink *);
247
248 /* unreference the source picture if we're feeding the destination filter
249 * a copied version dues to permission issues */
250 if(link->srcpic) {
251 avfilter_unref_pic(link->srcpic);
252 link->srcpic = NULL;
253 }
254
255 if(!(end_frame = link_dpad(link).end_frame))
256 end_frame = avfilter_default_end_frame;
257
258 end_frame(link);
259 }
260
261 void avfilter_draw_slice(AVFilterLink *link, int y, int h)
262 {
263 uint8_t *src[4], *dst[4];
264 int i, j, hsub, vsub;
265
266 /* copy the slice if needed for permission reasons */
267 if(link->srcpic) {
268 avcodec_get_chroma_sub_sample(link->format, &hsub, &vsub);
269
270 src[0] = link->srcpic-> data[0] + y * link->srcpic-> linesize[0];
271 dst[0] = link->cur_pic->data[0] + y * link->cur_pic->linesize[0];
272 for(i = 1; i < 4; i ++) {
273 if(link->srcpic->data[i]) {
274 src[i] = link->srcpic-> data[i] + (y >> vsub) * link->srcpic-> linesize[i];
275 dst[i] = link->cur_pic->data[i] + (y >> vsub) * link->cur_pic->linesize[i];
276 } else
277 src[i] = dst[i] = NULL;
278 }
279 for(j = 0; j < h; j ++) {
280 memcpy(dst[0], src[0], link->cur_pic->linesize[0]);
281 src[0] += link->srcpic ->linesize[0];
282 dst[0] += link->cur_pic->linesize[0];
283 }
284 for(i = 1; i < 4; i ++) {
285 if(!src[i]) continue;
286
287 for(j = 0; j < h >> vsub; j ++) {
288 memcpy(dst[i], src[i], link->cur_pic->linesize[i]);
289 src[i] += link->srcpic ->linesize[i];
290 dst[i] += link->cur_pic->linesize[i];
291 }
292 }
293 }
294
295 if(!link_dpad(link).draw_slice)
296 return;
297
298 link_dpad(link).draw_slice(link, y, h);
299 }
300
301 AVFilter *avfilter_get_by_name(char *name)
302 {
303 struct FilterList *filt;
304
305 for(filt = filters; filt; filt = filt->next)
306 if(!strcmp(filt->filter->name, name))
307 return filt->filter;
308
309 return NULL;
310 }
311
312 /* FIXME: insert in order, rather than insert at end + resort */
313 void avfilter_register(AVFilter *filter)
314 {
315 struct FilterList *newfilt = av_malloc(sizeof(struct FilterList));
316
317 newfilt->filter = filter;
318 newfilt->next = filters;
319 filters = newfilt;
320 }
321
322 void avfilter_init(void)
323 {
324 avfilter_register(&avfilter_vf_crop);
325 avfilter_register(&avfilter_vf_fifo);
326 avfilter_register(&avfilter_vf_fps);
327 avfilter_register(&avfilter_vf_graph);
328 avfilter_register(&avfilter_vf_graphdesc);
329 avfilter_register(&avfilter_vf_graphfile);
330 avfilter_register(&avfilter_vf_negate);
331 avfilter_register(&avfilter_vf_overlay);
332 avfilter_register(&avfilter_vf_passthrough);
333 avfilter_register(&avfilter_vf_scale);
334 avfilter_register(&avfilter_vf_slicify);
335 avfilter_register(&avfilter_vf_split);
336 avfilter_register(&avfilter_vf_vflip);
337 }
338
339 void avfilter_uninit(void)
340 {
341 struct FilterList *tmp;
342
343 for(; filters; filters = tmp) {
344 tmp = filters->next;
345 av_free(filters);
346 }
347 }
348
349 static int pad_count(const AVFilterPad *pads)
350 {
351 AVFilterPad *p = (AVFilterPad *) pads;
352 int count;
353
354 for(count = 0; p->name; count ++) p ++;
355 return count;
356 }
357
358 static const char *filter_name(void *p)
359 {
360 AVFilterContext *filter = p;
361 return filter->filter->name;
362 }
363
364 AVFilterContext *avfilter_open(AVFilter *filter, char *inst_name)
365 {
366 AVFilterContext *ret;
367
368 if (!filter)
369 return 0;
370
371 ret = av_malloc(sizeof(AVFilterContext));
372
373 ret->av_class = av_mallocz(sizeof(AVClass));
374 ret->av_class->item_name = filter_name;
375 ret->filter = filter;
376 ret->name = inst_name ? av_strdup(inst_name) : NULL;
377 ret->priv = av_mallocz(filter->priv_size);
378
379 ret->input_count = pad_count(filter->inputs);
380 ret->input_pads = av_malloc(sizeof(AVFilterPad) * ret->input_count);
381 memcpy(ret->input_pads, filter->inputs, sizeof(AVFilterPad)*ret->input_count);
382 ret->inputs = av_mallocz(sizeof(AVFilterLink*) * ret->input_count);
383
384 ret->output_count = pad_count(filter->outputs);
385 ret->output_pads = av_malloc(sizeof(AVFilterPad) * ret->output_count);
386 memcpy(ret->output_pads, filter->outputs, sizeof(AVFilterPad)*ret->output_count);
387 ret->outputs = av_mallocz(sizeof(AVFilterLink*) * ret->output_count);
388
389 return ret;
390 }
391
392 void avfilter_destroy(AVFilterContext *filter)
393 {
394 int i;
395
396 if(filter->filter->uninit)
397 filter->filter->uninit(filter);
398
399 for(i = 0; i < filter->input_count; i ++) {
400 if(filter->inputs[i])
401 filter->inputs[i]->src->outputs[filter->inputs[i]->srcpad] = NULL;
402 av_freep(&filter->inputs[i]);
403 }
404 for(i = 0; i < filter->output_count; i ++) {
405 if(filter->outputs[i])
406 filter->outputs[i]->dst->inputs[filter->outputs[i]->dstpad] = NULL;
407 av_freep(&filter->outputs[i]);
408 }
409
410 av_freep(&filter->name);
411 av_freep(&filter->input_pads);
412 av_freep(&filter->output_pads);
413 av_freep(&filter->inputs);
414 av_freep(&filter->outputs);
415 av_freep(&filter->priv);
416 av_freep(&filter->av_class);
417 av_free(filter);
418 }
419
420 int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque)
421 {
422 int ret;
423
424 if(filter->filter->init)
425 if((ret = filter->filter->init(filter, args, opaque))) return ret;
426 return 0;
427 }
428
429 int *avfilter_make_format_list(int len, ...)
430 {
431 int *ret, i;
432 va_list vl;
433
434 ret = av_malloc(sizeof(int) * (len + 1));
435 va_start(vl, len);
436 for(i = 0; i < len; i ++)
437 ret[i] = va_arg(vl, int);
438 va_end(vl);
439 ret[len] = -1;
440
441 return ret;
442 }
443