Initial stab at an API
[libav.git] / libavfilter / avfilter.c
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4dbbcdee
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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 <stdlib.h>
23#include <string.h>
24#include <stdio.h>
25
26#include "avfilter.h"
27
28/** list of registered filters, sorted by name */
29static int filter_count = 0;
30static AVFilter **filters = NULL;
31
32/* TODO: buffer pool. see comment for avfilter_default_get_video_buffer() */
33void avfilter_default_free_video_buffer(AVFilterPic *pic)
34{
35 avpicture_free((AVPicture *) pic);
36 av_free(pic);
37}
38
39/* TODO: set the buffer's priv member to a context structure for the whole
40 * filter chain. This will allow for a buffer pool instead of the constant
41 * alloc & free cycle currently implemented. */
42AVFilterPicRef *avfilter_default_get_video_buffer(AVFilterLink *link, int perms)
43{
44 AVFilterPic *pic = av_mallocz(sizeof(AVFilterPic));
45 AVFilterPicRef *ref = av_mallocz(sizeof(AVFilterPicRef));
46
47 ref->pic = pic;
48 ref->w = link->w;
49 ref->h = link->h;
50 ref->perms = perms;
51
52 pic->refcount = 1;
53 pic->format = link->format;
54 pic->free = avfilter_default_free_video_buffer;
55 avpicture_alloc((AVPicture *)pic, pic->format, ref->w, ref->h);
56
57 ref->data[0] = pic->data[0];
58 ref->data[1] = pic->data[1];
59 ref->data[2] = pic->data[2];
60 ref->data[3] = pic->data[3];
61
62 return ref;
63}
64
65void avfilter_default_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
66{
67 link->cur_pic = picref;
68}
69
70void avfilter_default_end_frame(AVFilterLink *link)
71{
72 avfilter_unref_pic(link->cur_pic);
73 link->cur_pic = NULL;
74}
75
76AVFilterPicRef *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
84void avfilter_unref_pic(AVFilterPicRef *ref)
85{
86 if(-- ref->pic->refcount == 0)
87 ref->pic->free(ref->pic);
88 av_free(ref);
89}
90
91int avfilter_link(AVFilterContext *src, unsigned srcpad,
92 AVFilterContext *dst, unsigned dstpad)
93{
94 AVFilterLink *link;
95
96 if(src->outputs[srcpad] || dst->inputs[dstpad])
97 return -1;
98
99 src->outputs[srcpad] =
100 dst->inputs[dstpad] = link = av_malloc(sizeof(AVFilterLink));
101
102 link->src = src;
103 link->dst = dst;
104 link->srcpad = srcpad;
105 link->dstpad = dstpad;
106 link->cur_pic = NULL;
107
108 src->filter->outputs[dstpad].set_video_props(link);
109 return 0;
110}
111
112AVFilterPicRef *avfilter_get_video_buffer(AVFilterLink *link, int perms)
113{
114 AVFilterPicRef *ret = NULL;
115
116 if(link->dst->filter->inputs[link->dstpad].get_video_buffer)
117 ret = link->dst->filter->inputs[link->dstpad].get_video_buffer(link, perms);
118
119 if(!ret)
120 ret = avfilter_default_get_video_buffer(link, perms);
121
122 return ret;
123}
124
125void avfilter_request_frame(AVFilterLink *link)
126{
127 link->src->filter->outputs[link->srcpad].request_frame(link);
128}
129
130/* XXX: should we do the duplicating of the picture ref here, instead of
131 * forcing the source filter to do it? */
132void avfilter_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
133{
134 void (*start_frame)(AVFilterLink *, AVFilterPicRef *);
135
136 start_frame = link->dst->filter->inputs[link->dstpad].start_frame;
137 if(!start_frame)
138 start_frame = avfilter_default_start_frame;
139
140 start_frame(link, picref);
141}
142
143void avfilter_end_frame(AVFilterLink *link)
144{
145 void (*end_frame)(AVFilterLink *);
146
147 end_frame = link->dst->filter->inputs[link->dstpad].end_frame;
148 if(!end_frame)
149 end_frame = avfilter_default_end_frame;
150
151 end_frame(link);
152}
153
154void avfilter_draw_slice(AVFilterLink *link, uint8_t *data[4], int y, int h)
155{
156 link->dst->filter->inputs[link->dstpad].draw_slice(link, data, y, h);
157}
158
159static int filter_cmp(const void *aa, const void *bb)
160{
161 const AVFilter *a = *(const AVFilter **)aa, *b = *(const AVFilter **)bb;
162 return strcmp(a->name, b->name);
163}
164
165AVFilter *avfilter_get_by_name(char *name)
166{
167 AVFilter key = { .name = name, };
168 AVFilter *key2 = &key;
169 AVFilter **ret;
170
171 ret = bsearch(&key2, filters, filter_count, sizeof(AVFilter **), filter_cmp);
172 if(ret)
173 return *ret;
174 return NULL;
175}
176
177/* FIXME: insert in order, rather than insert at end + resort */
178void avfilter_register(AVFilter *filter)
179{
180 filters = av_realloc(filters, sizeof(AVFilter*) * (filter_count+1));
181 filters[filter_count] = filter;
182 qsort(filters, ++filter_count, sizeof(AVFilter **), filter_cmp);
183}
184
185void avfilter_init(void)
186{
187}
188
189void avfilter_uninit(void)
190{
191 av_freep(&filters);
192 filter_count = 0;
193}
194
195static int pad_count(const AVFilterPad *pads)
196{
197 AVFilterPad *p = (AVFilterPad *) pads;
198 int count;
199
200 for(count = 0; p->name; count ++) p ++;
201 return count;
202}
203
204static const char *filter_name(void *p)
205{
206 AVFilterContext *filter = p;
207 return filter->filter->name;
208}
209
210AVFilterContext *avfilter_create(AVFilter *filter)
211{
212 AVFilterContext *ret = av_malloc(sizeof(AVFilterContext));
213
214 ret->av_class = av_mallocz(sizeof(AVClass));
215 ret->av_class->item_name = filter_name;
216 ret->filter = filter;
217 ret->inputs = av_mallocz(sizeof(AVFilterLink*) * pad_count(filter->inputs));
218 ret->outputs = av_mallocz(sizeof(AVFilterLink*) * pad_count(filter->outputs));
219 ret->priv = av_mallocz(filter->priv_size);
220
221 return ret;
222}
223
224void avfilter_destroy(AVFilterContext *filter)
225{
226 int i;
227
228 if(filter->filter->uninit)
229 filter->filter->uninit(filter);
230
231 for(i = 0; i < pad_count(filter->filter->inputs); i ++) {
232 if(filter->inputs[i])
233 filter->inputs[i]->src->outputs[filter->inputs[i]->srcpad] = NULL;
234 av_free(filter->inputs[i]);
235 }
236 for(i = 0; i < pad_count(filter->filter->outputs); i ++) {
237 if(filter->outputs[i])
238 filter->outputs[i]->dst->inputs[filter->outputs[i]->dstpad] = NULL;
239 av_free(filter->outputs[i]);
240 }
241
242 av_free(filter->inputs);
243 av_free(filter->outputs);
244 av_free(filter->priv);
245 av_free(filter->av_class);
246 av_free(filter);
247}
248
249AVFilterContext *avfilter_create_by_name(char *name)
250{
251 AVFilter *filt;
252
253 if(!(filt = avfilter_get_by_name(name))) return NULL;
254 return avfilter_create(filt);
255}
256
257int avfilter_init_filter(AVFilterContext *filter)
258{
259 int ret, i;
260
261 if(filter->filter->init)
262 if((ret = filter->filter->init(filter))) return ret;
263 for(i = 0; i < pad_count(filter->filter->outputs); i ++)
264 if(filter->outputs[i])
265 filter->filter->outputs[i].set_video_props(filter->outputs[i]);
266 return 0;
267}
268