Actually fail when colorspaces don't match
[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, sorted by name */
31 static int filter_count = 0;
32 static AVFilter **filters = NULL;
33
34 /* TODO: buffer pool. see comment for avfilter_default_get_video_buffer() */
35 void avfilter_default_free_video_buffer(AVFilterPic *pic)
36 {
37 avpicture_free((AVPicture *) pic);
38 av_free(pic);
39 }
40
41 /* TODO: set the buffer's priv member to a context structure for the whole
42 * filter chain. This will allow for a buffer pool instead of the constant
43 * alloc & free cycle currently implemented. */
44 AVFilterPicRef *avfilter_default_get_video_buffer(AVFilterLink *link, int perms)
45 {
46 AVFilterPic *pic = av_mallocz(sizeof(AVFilterPic));
47 AVFilterPicRef *ref = av_mallocz(sizeof(AVFilterPicRef));
48
49 ref->pic = pic;
50 ref->w = link->w;
51 ref->h = link->h;
52 ref->perms = perms;
53
54 pic->refcount = 1;
55 pic->format = link->format;
56 pic->free = avfilter_default_free_video_buffer;
57 avpicture_alloc((AVPicture *)pic, pic->format, ref->w, ref->h);
58
59 memcpy(ref->data, pic->data, sizeof(pic->data));
60 memcpy(ref->linesize, pic->linesize, sizeof(pic->linesize));
61
62 return ref;
63 }
64
65 void avfilter_default_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
66 {
67 AVFilterLink *out = link->dst->outputs[0];
68
69 link->cur_pic = picref;
70
71 if(out) {
72 out->outpic = avfilter_get_video_buffer(out, AV_PERM_WRITE);
73 avfilter_start_frame(out, avfilter_ref_pic(out->outpic, ~0));
74 }
75 }
76
77 void avfilter_default_end_frame(AVFilterLink *link)
78 {
79 AVFilterLink *out = link->dst->outputs[0];
80
81 avfilter_unref_pic(link->cur_pic);
82 link->cur_pic = NULL;
83
84 if(out) {
85 avfilter_unref_pic(out->outpic);
86 out->outpic = NULL;
87 avfilter_end_frame(out);
88 }
89 }
90
91 AVFilterPicRef *avfilter_ref_pic(AVFilterPicRef *ref, int pmask)
92 {
93 AVFilterPicRef *ret = av_malloc(sizeof(AVFilterPicRef));
94 memcpy(ret, ref, sizeof(AVFilterPicRef));
95 ret->perms &= pmask;
96 ret->pic->refcount ++;
97 return ret;
98 }
99
100 void avfilter_unref_pic(AVFilterPicRef *ref)
101 {
102 if(-- ref->pic->refcount == 0)
103 ref->pic->free(ref->pic);
104 av_free(ref);
105 }
106
107 /**
108 * default config_link() implementation for output video links to simplify
109 * the implementation of one input one output video filters */
110 static int default_config_output_link(AVFilterLink *link)
111 {
112 link->w = link->src->inputs[0]->w;
113 link->h = link->src->inputs[0]->h;
114
115 return 0;
116 }
117
118 /**
119 * default query_formats() implementation for output video links to simplify
120 * the implementation of one input one output video filters */
121 static int *default_query_output_formats(AVFilterLink *link)
122 {
123 return avfilter_make_format_list(1, link->src->inputs[0]->format);
124 }
125
126 int avfilter_link(AVFilterContext *src, unsigned srcpad,
127 AVFilterContext *dst, unsigned dstpad)
128 {
129 AVFilterLink *link;
130 int *fmts[2], i, j;
131
132 if(src->outputs[srcpad] || dst->inputs[dstpad])
133 return -1;
134
135 src->outputs[srcpad] =
136 dst->inputs[dstpad] = link = av_malloc(sizeof(AVFilterLink));
137
138 link->src = src;
139 link->dst = dst;
140 link->srcpad = srcpad;
141 link->dstpad = dstpad;
142 link->cur_pic = NULL;
143
144 /* find a format both filters support - TODO: auto-insert conversion filter */
145 link->format = -1;
146 if(src->filter->outputs[srcpad].query_formats)
147 fmts[0] = src->filter->outputs[srcpad].query_formats(link);
148 else
149 fmts[0] = default_query_output_formats(link);
150 fmts[1] = dst->filter-> inputs[dstpad].query_formats(link);
151 for(i = 0; fmts[0][i] != -1; i ++)
152 for(j = 0; fmts[1][j] != -1; j ++)
153 if(fmts[0][i] == fmts[1][j]) {
154 link->format = fmts[0][i];
155 goto format_done;
156 }
157
158 format_done:
159 av_free(fmts[0]);
160 av_free(fmts[1]);
161 if(link->format == -1) {
162 /* failed to find a format. fail at creating the link */
163 av_free(link);
164 src->outputs[srcpad] = NULL;
165 dst->inputs[dstpad] = NULL;
166 return -1;
167 }
168
169 if (src->filter->outputs[srcpad].config_props)
170 src->filter->outputs[srcpad].config_props(link);
171 else
172 default_config_output_link(link);
173
174 if (dst->filter->inputs[dstpad].config_props)
175 dst->filter->inputs[dstpad].config_props(link);
176
177 return 0;
178 }
179
180 AVFilterPicRef *avfilter_get_video_buffer(AVFilterLink *link, int perms)
181 {
182 AVFilterPicRef *ret = NULL;
183
184 if(link->dst->filter->inputs[link->dstpad].get_video_buffer)
185 ret = link->dst->filter->inputs[link->dstpad].get_video_buffer(link, perms);
186
187 if(!ret)
188 ret = avfilter_default_get_video_buffer(link, perms);
189
190 return ret;
191 }
192
193 void avfilter_request_frame(AVFilterLink *link)
194 {
195 const AVFilterPad *pad = &link->src->filter->outputs[link->srcpad];
196
197 if(pad->request_frame)
198 pad->request_frame(link);
199 else if(link->src->inputs[0])
200 avfilter_request_frame(link->src->inputs[0]);
201 }
202
203 /* XXX: should we do the duplicating of the picture ref here, instead of
204 * forcing the source filter to do it? */
205 void avfilter_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
206 {
207 void (*start_frame)(AVFilterLink *, AVFilterPicRef *);
208
209 start_frame = link->dst->filter->inputs[link->dstpad].start_frame;
210 if(!start_frame)
211 start_frame = avfilter_default_start_frame;
212
213 start_frame(link, picref);
214 }
215
216 void avfilter_end_frame(AVFilterLink *link)
217 {
218 void (*end_frame)(AVFilterLink *);
219
220 end_frame = link->dst->filter->inputs[link->dstpad].end_frame;
221 if(!end_frame)
222 end_frame = avfilter_default_end_frame;
223
224 end_frame(link);
225 }
226
227 void avfilter_draw_slice(AVFilterLink *link, uint8_t *data[4], int y, int h)
228 {
229 link->dst->filter->inputs[link->dstpad].draw_slice(link, data, y, h);
230 }
231
232 static int filter_cmp(const void *aa, const void *bb)
233 {
234 const AVFilter *a = *(const AVFilter **)aa, *b = *(const AVFilter **)bb;
235 return strcmp(a->name, b->name);
236 }
237
238 AVFilter *avfilter_get_by_name(char *name)
239 {
240 AVFilter key = { .name = name, };
241 AVFilter *key2 = &key;
242 AVFilter **ret;
243
244 ret = bsearch(&key2, filters, filter_count, sizeof(AVFilter **), filter_cmp);
245 if(ret)
246 return *ret;
247 return NULL;
248 }
249
250 /* FIXME: insert in order, rather than insert at end + resort */
251 void avfilter_register(AVFilter *filter)
252 {
253 filters = av_realloc(filters, sizeof(AVFilter*) * (filter_count+1));
254 filters[filter_count] = filter;
255 qsort(filters, ++filter_count, sizeof(AVFilter **), filter_cmp);
256 }
257
258 void avfilter_init(void)
259 {
260 avfilter_register(&vsrc_dummy);
261 avfilter_register(&vsrc_ppm);
262 avfilter_register(&vf_crop);
263 avfilter_register(&vf_passthrough);
264 avfilter_register(&vf_rgb2bgr);
265 avfilter_register(&vf_slicify);
266 avfilter_register(&vo_sdl);
267 }
268
269 void avfilter_uninit(void)
270 {
271 av_freep(&filters);
272 filter_count = 0;
273 }
274
275 static int pad_count(const AVFilterPad *pads)
276 {
277 AVFilterPad *p = (AVFilterPad *) pads;
278 int count;
279
280 for(count = 0; p->name; count ++) p ++;
281 return count;
282 }
283
284 static const char *filter_name(void *p)
285 {
286 AVFilterContext *filter = p;
287 return filter->filter->name;
288 }
289
290 AVFilterContext *avfilter_create(AVFilter *filter)
291 {
292 AVFilterContext *ret = av_malloc(sizeof(AVFilterContext));
293
294 ret->av_class = av_mallocz(sizeof(AVClass));
295 ret->av_class->item_name = filter_name;
296 ret->filter = filter;
297 ret->inputs = av_mallocz(sizeof(AVFilterLink*) * pad_count(filter->inputs));
298 ret->outputs = av_mallocz(sizeof(AVFilterLink*) * pad_count(filter->outputs));
299 ret->priv = av_mallocz(filter->priv_size);
300
301 return ret;
302 }
303
304 void avfilter_destroy(AVFilterContext *filter)
305 {
306 int i;
307
308 if(filter->filter->uninit)
309 filter->filter->uninit(filter);
310
311 for(i = 0; i < pad_count(filter->filter->inputs); i ++) {
312 if(filter->inputs[i])
313 filter->inputs[i]->src->outputs[filter->inputs[i]->srcpad] = NULL;
314 av_free(filter->inputs[i]);
315 }
316 for(i = 0; i < pad_count(filter->filter->outputs); i ++) {
317 if(filter->outputs[i])
318 filter->outputs[i]->dst->inputs[filter->outputs[i]->dstpad] = NULL;
319 av_free(filter->outputs[i]);
320 }
321
322 av_free(filter->inputs);
323 av_free(filter->outputs);
324 av_free(filter->priv);
325 av_free(filter->av_class);
326 av_free(filter);
327 }
328
329 AVFilterContext *avfilter_create_by_name(char *name)
330 {
331 AVFilter *filt;
332
333 if(!(filt = avfilter_get_by_name(name))) return NULL;
334 return avfilter_create(filt);
335 }
336
337 int avfilter_init_filter(AVFilterContext *filter, const char *args)
338 {
339 int ret, i;
340
341 if(filter->filter->init)
342 if((ret = filter->filter->init(filter, args))) return ret;
343 return 0;
344 }
345
346 int *avfilter_make_format_list(int len, ...)
347 {
348 int *ret, i;
349 va_list vl;
350
351 ret = av_malloc(sizeof(int) * (len + 1));
352 va_start(vl, len);
353 for(i = 0; i < len; i ++)
354 ret[i] = va_arg(vl, int);
355 va_end(vl);
356 ret[len] = -1;
357
358 return ret;
359 }
360