Separate the process of creating links between filters from that of configuring
[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 AVFilterPicRef *avfilter_ref_pic(AVFilterPicRef *ref, int pmask)
35 {
36 AVFilterPicRef *ret = av_malloc(sizeof(AVFilterPicRef));
37 memcpy(ret, ref, sizeof(AVFilterPicRef));
38 ret->perms &= pmask;
39 ret->pic->refcount ++;
40 return ret;
41 }
42
43 void avfilter_unref_pic(AVFilterPicRef *ref)
44 {
45 if(-- ref->pic->refcount == 0)
46 ref->pic->free(ref->pic);
47 av_free(ref);
48 }
49
50 int avfilter_link(AVFilterContext *src, unsigned srcpad,
51 AVFilterContext *dst, unsigned dstpad)
52 {
53 AVFilterLink *link;
54
55 if(src->output_count <= srcpad || dst->input_count <= dstpad ||
56 src->outputs[srcpad] || dst->inputs[dstpad])
57 return -1;
58
59 src->outputs[srcpad] =
60 dst->inputs[dstpad] = link = av_malloc(sizeof(AVFilterLink));
61
62 link->src = src;
63 link->dst = dst;
64 link->srcpad = srcpad;
65 link->dstpad = dstpad;
66 link->cur_pic = NULL;
67 link->format = -1;
68
69 return 0;
70 }
71
72 int avfilter_config_link(AVFilterLink *link)
73 {
74 int *fmts[2], i, j;
75 int (*config_link)(AVFilterLink *);
76
77 if(!link)
78 return 0;
79
80 /* find a format both filters support - TODO: auto-insert conversion filter */
81 link->format = -1;
82 if(link->src->output_pads[link->srcpad].query_formats)
83 fmts[0] = link->src->output_pads[link->srcpad].query_formats(link);
84 else
85 fmts[0] = avfilter_default_query_output_formats(link);
86 fmts[1] = link->dst->input_pads[link->dstpad].query_formats(link);
87 for(i = 0; fmts[0][i] != -1; i ++)
88 for(j = 0; fmts[1][j] != -1; j ++)
89 if(fmts[0][i] == fmts[1][j]) {
90 link->format = fmts[0][i];
91 goto format_done;
92 }
93
94 format_done:
95 av_free(fmts[0]);
96 av_free(fmts[1]);
97 if(link->format == -1)
98 return -1;
99
100 if(!(config_link = link->src->output_pads[link->srcpad].config_props))
101 config_link = avfilter_default_config_output_link;
102 if(config_link(link))
103 return -1;
104
105 if(!(config_link = link->dst->input_pads[link->dstpad].config_props))
106 config_link = avfilter_default_config_input_link;
107 if(config_link(link))
108 return -1;
109
110 return 0;
111 }
112
113 AVFilterPicRef *avfilter_get_video_buffer(AVFilterLink *link, int perms)
114 {
115 AVFilterPicRef *ret = NULL;
116
117 if(link->dst->input_pads[link->dstpad].get_video_buffer)
118 ret = link->dst->input_pads[link->dstpad].get_video_buffer(link, perms);
119
120 if(!ret)
121 ret = avfilter_default_get_video_buffer(link, perms);
122
123 return ret;
124 }
125
126 void avfilter_request_frame(AVFilterLink *link)
127 {
128 const AVFilterPad *pad = &link->src->output_pads[link->srcpad];
129
130 if(pad->request_frame)
131 pad->request_frame(link);
132 else if(link->src->inputs[0])
133 avfilter_request_frame(link->src->inputs[0]);
134 }
135
136 /* XXX: should we do the duplicating of the picture ref here, instead of
137 * forcing the source filter to do it? */
138 void avfilter_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
139 {
140 void (*start_frame)(AVFilterLink *, AVFilterPicRef *);
141
142 start_frame = link->dst->input_pads[link->dstpad].start_frame;
143 if(!start_frame)
144 start_frame = avfilter_default_start_frame;
145
146 start_frame(link, picref);
147 }
148
149 void avfilter_end_frame(AVFilterLink *link)
150 {
151 void (*end_frame)(AVFilterLink *);
152
153 end_frame = link->dst->input_pads[link->dstpad].end_frame;
154 if(!end_frame)
155 end_frame = avfilter_default_end_frame;
156
157 end_frame(link);
158 }
159
160 void avfilter_draw_slice(AVFilterLink *link, uint8_t *data[4], int y, int h)
161 {
162 if(!link->dst->input_pads[link->dstpad].draw_slice)
163 return;
164
165 link->dst->input_pads[link->dstpad].draw_slice(link, data, y, h);
166 }
167
168 static int filter_cmp(const void *aa, const void *bb)
169 {
170 const AVFilter *a = *(const AVFilter **)aa, *b = *(const AVFilter **)bb;
171 return strcmp(a->name, b->name);
172 }
173
174 AVFilter *avfilter_get_by_name(char *name)
175 {
176 AVFilter key = { .name = name, };
177 AVFilter *key2 = &key;
178 AVFilter **ret;
179
180 ret = bsearch(&key2, filters, filter_count, sizeof(AVFilter **), filter_cmp);
181 if(ret)
182 return *ret;
183 return NULL;
184 }
185
186 /* FIXME: insert in order, rather than insert at end + resort */
187 void avfilter_register(AVFilter *filter)
188 {
189 filters = av_realloc(filters, sizeof(AVFilter*) * (filter_count+1));
190 filters[filter_count] = filter;
191 qsort(filters, ++filter_count, sizeof(AVFilter **), filter_cmp);
192 }
193
194 void avfilter_init(void)
195 {
196 avfilter_register(&vsrc_dummy);
197 avfilter_register(&vsrc_ppm);
198 avfilter_register(&vf_crop);
199 avfilter_register(&vf_graph);
200 avfilter_register(&vf_passthrough);
201 avfilter_register(&vf_rgb2bgr);
202 avfilter_register(&vf_slicify);
203 avfilter_register(&vo_sdl);
204 }
205
206 void avfilter_uninit(void)
207 {
208 av_freep(&filters);
209 filter_count = 0;
210 }
211
212 static int pad_count(const AVFilterPad *pads)
213 {
214 AVFilterPad *p = (AVFilterPad *) pads;
215 int count;
216
217 for(count = 0; p->name; count ++) p ++;
218 return count;
219 }
220
221 static const char *filter_name(void *p)
222 {
223 AVFilterContext *filter = p;
224 return filter->filter->name;
225 }
226
227 AVFilterContext *avfilter_create(AVFilter *filter, char *inst_name)
228 {
229 AVFilterContext *ret = av_malloc(sizeof(AVFilterContext));
230
231 ret->av_class = av_mallocz(sizeof(AVClass));
232 ret->av_class->item_name = filter_name;
233 ret->filter = filter;
234 ret->name = inst_name ? av_strdup(inst_name) : NULL;
235 ret->priv = av_mallocz(filter->priv_size);
236
237 ret->input_count = pad_count(filter->inputs);
238 ret->input_pads = av_malloc(sizeof(AVFilterPad) * ret->input_count);
239 memcpy(ret->input_pads, filter->inputs, sizeof(AVFilterPad)*ret->input_count);
240 ret->inputs = av_mallocz(sizeof(AVFilterLink*) * ret->input_count);
241
242 ret->output_count = pad_count(filter->outputs);
243 ret->output_pads = av_malloc(sizeof(AVFilterPad) * ret->output_count);
244 memcpy(ret->output_pads, filter->outputs, sizeof(AVFilterPad)*ret->output_count);
245 ret->outputs = av_mallocz(sizeof(AVFilterLink*) * ret->output_count);
246
247 return ret;
248 }
249
250 void avfilter_destroy(AVFilterContext *filter)
251 {
252 int i;
253
254 if(filter->filter->uninit)
255 filter->filter->uninit(filter);
256
257 for(i = 0; i < filter->input_count; i ++) {
258 if(filter->inputs[i])
259 filter->inputs[i]->src->outputs[filter->inputs[i]->srcpad] = NULL;
260 av_free(filter->inputs[i]);
261 }
262 for(i = 0; i < filter->output_count; i ++) {
263 if(filter->outputs[i])
264 filter->outputs[i]->dst->inputs[filter->outputs[i]->dstpad] = NULL;
265 av_free(filter->outputs[i]);
266 }
267
268 av_free(filter->name);
269 av_free(filter->input_pads);
270 av_free(filter->output_pads);
271 av_free(filter->inputs);
272 av_free(filter->outputs);
273 av_free(filter->priv);
274 av_free(filter->av_class);
275 av_free(filter);
276 }
277
278 AVFilterContext *avfilter_create_by_name(char *name, char *inst_name)
279 {
280 AVFilter *filt;
281
282 if(!(filt = avfilter_get_by_name(name))) return NULL;
283 return avfilter_create(filt, inst_name);
284 }
285
286 int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque)
287 {
288 int ret;
289
290 if(filter->filter->init)
291 if((ret = filter->filter->init(filter, args, opaque))) return ret;
292 return 0;
293 }
294
295 int *avfilter_make_format_list(int len, ...)
296 {
297 int *ret, i;
298 va_list vl;
299
300 ret = av_malloc(sizeof(int) * (len + 1));
301 va_start(vl, len);
302 for(i = 0; i < len; i ++)
303 ret[i] = va_arg(vl, int);
304 va_end(vl);
305 ret[len] = -1;
306
307 return ret;
308 }
309