Use memcpy() to copy an array.
[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 <stdlib.h>
23 #include <string.h>
24 #include <stdio.h>
25
26 #include "avfilter.h"
27 #include "allfilters.h"
28
29 /** list of registered filters, sorted by name */
30 static int filter_count = 0;
31 static AVFilter **filters = NULL;
32
33 /* TODO: buffer pool. see comment for avfilter_default_get_video_buffer() */
34 void avfilter_default_free_video_buffer(AVFilterPic *pic)
35 {
36 avpicture_free((AVPicture *) pic);
37 av_free(pic);
38 }
39
40 /* TODO: set the buffer's priv member to a context structure for the whole
41 * filter chain. This will allow for a buffer pool instead of the constant
42 * alloc & free cycle currently implemented. */
43 AVFilterPicRef *avfilter_default_get_video_buffer(AVFilterLink *link, int perms)
44 {
45 AVFilterPic *pic = av_mallocz(sizeof(AVFilterPic));
46 AVFilterPicRef *ref = av_mallocz(sizeof(AVFilterPicRef));
47
48 ref->pic = pic;
49 ref->w = link->w;
50 ref->h = link->h;
51 ref->perms = perms;
52
53 pic->refcount = 1;
54 pic->format = link->format;
55 pic->free = avfilter_default_free_video_buffer;
56 avpicture_alloc((AVPicture *)pic, pic->format, ref->w, ref->h);
57
58 memcpy(ref->data, pic->data, sizeof(int *) * 4);
59
60 return ref;
61 }
62
63 void avfilter_default_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
64 {
65 link->cur_pic = picref;
66 }
67
68 void avfilter_default_end_frame(AVFilterLink *link)
69 {
70 avfilter_unref_pic(link->cur_pic);
71 link->cur_pic = NULL;
72 }
73
74 AVFilterPicRef *avfilter_ref_pic(AVFilterPicRef *ref)
75 {
76 AVFilterPicRef *ret = av_malloc(sizeof(AVFilterPicRef));
77 memcpy(ret, ref, sizeof(AVFilterPicRef));
78 ret->pic->refcount ++;
79 return ret;
80 }
81
82 void avfilter_unref_pic(AVFilterPicRef *ref)
83 {
84 if(-- ref->pic->refcount == 0)
85 ref->pic->free(ref->pic);
86 av_free(ref);
87 }
88
89 int avfilter_link(AVFilterContext *src, unsigned srcpad,
90 AVFilterContext *dst, unsigned dstpad)
91 {
92 AVFilterLink *link;
93
94 if(src->outputs[srcpad] || dst->inputs[dstpad])
95 return -1;
96
97 src->outputs[srcpad] =
98 dst->inputs[dstpad] = link = av_malloc(sizeof(AVFilterLink));
99
100 link->src = src;
101 link->dst = dst;
102 link->srcpad = srcpad;
103 link->dstpad = dstpad;
104 link->cur_pic = NULL;
105
106 src->filter->outputs[dstpad].set_video_props(link);
107 return 0;
108 }
109
110 AVFilterPicRef *avfilter_get_video_buffer(AVFilterLink *link, int perms)
111 {
112 AVFilterPicRef *ret = NULL;
113
114 if(link->dst->filter->inputs[link->dstpad].get_video_buffer)
115 ret = link->dst->filter->inputs[link->dstpad].get_video_buffer(link, perms);
116
117 if(!ret)
118 ret = avfilter_default_get_video_buffer(link, perms);
119
120 return ret;
121 }
122
123 void avfilter_request_frame(AVFilterLink *link)
124 {
125 link->src->filter->outputs[link->srcpad].request_frame(link);
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->filter->inputs[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->filter->inputs[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 link->dst->filter->inputs[link->dstpad].draw_slice(link, data, y, h);
155 }
156
157 static int filter_cmp(const void *aa, const void *bb)
158 {
159 const AVFilter *a = *(const AVFilter **)aa, *b = *(const AVFilter **)bb;
160 return strcmp(a->name, b->name);
161 }
162
163 AVFilter *avfilter_get_by_name(char *name)
164 {
165 AVFilter key = { .name = name, };
166 AVFilter *key2 = &key;
167 AVFilter **ret;
168
169 ret = bsearch(&key2, filters, filter_count, sizeof(AVFilter **), filter_cmp);
170 if(ret)
171 return *ret;
172 return NULL;
173 }
174
175 /* FIXME: insert in order, rather than insert at end + resort */
176 void avfilter_register(AVFilter *filter)
177 {
178 filters = av_realloc(filters, sizeof(AVFilter*) * (filter_count+1));
179 filters[filter_count] = filter;
180 qsort(filters, ++filter_count, sizeof(AVFilter **), filter_cmp);
181 }
182
183 void avfilter_init(void)
184 {
185 avfilter_register(&vsrc_dummy);
186 avfilter_register(&vf_crop);
187 avfilter_register(&vf_passthrough);
188 avfilter_register(&vo_sdl);
189 }
190
191 void avfilter_uninit(void)
192 {
193 av_freep(&filters);
194 filter_count = 0;
195 }
196
197 static int pad_count(const AVFilterPad *pads)
198 {
199 AVFilterPad *p = (AVFilterPad *) pads;
200 int count;
201
202 for(count = 0; p->name; count ++) p ++;
203 return count;
204 }
205
206 static const char *filter_name(void *p)
207 {
208 AVFilterContext *filter = p;
209 return filter->filter->name;
210 }
211
212 AVFilterContext *avfilter_create(AVFilter *filter)
213 {
214 AVFilterContext *ret = av_malloc(sizeof(AVFilterContext));
215
216 ret->av_class = av_mallocz(sizeof(AVClass));
217 ret->av_class->item_name = filter_name;
218 ret->filter = filter;
219 ret->inputs = av_mallocz(sizeof(AVFilterLink*) * pad_count(filter->inputs));
220 ret->outputs = av_mallocz(sizeof(AVFilterLink*) * pad_count(filter->outputs));
221 ret->priv = av_mallocz(filter->priv_size);
222
223 return ret;
224 }
225
226 void avfilter_destroy(AVFilterContext *filter)
227 {
228 int i;
229
230 if(filter->filter->uninit)
231 filter->filter->uninit(filter);
232
233 for(i = 0; i < pad_count(filter->filter->inputs); i ++) {
234 if(filter->inputs[i])
235 filter->inputs[i]->src->outputs[filter->inputs[i]->srcpad] = NULL;
236 av_free(filter->inputs[i]);
237 }
238 for(i = 0; i < pad_count(filter->filter->outputs); i ++) {
239 if(filter->outputs[i])
240 filter->outputs[i]->dst->inputs[filter->outputs[i]->dstpad] = NULL;
241 av_free(filter->outputs[i]);
242 }
243
244 av_free(filter->inputs);
245 av_free(filter->outputs);
246 av_free(filter->priv);
247 av_free(filter->av_class);
248 av_free(filter);
249 }
250
251 AVFilterContext *avfilter_create_by_name(char *name)
252 {
253 AVFilter *filt;
254
255 if(!(filt = avfilter_get_by_name(name))) return NULL;
256 return avfilter_create(filt);
257 }
258
259 int avfilter_init_filter(AVFilterContext *filter)
260 {
261 int ret, i;
262
263 if(filter->filter->init)
264 if((ret = filter->filter->init(filter))) return ret;
265 for(i = 0; i < pad_count(filter->filter->outputs); i ++)
266 if(filter->outputs[i])
267 filter->filter->outputs[i].set_video_props(filter->outputs[i]);
268 return 0;
269 }
270