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