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