Add a vertical flip filter
[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 void avfilter_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
51 AVFilterPad **pads, AVFilterLink ***links,
52 AVFilterPad *newpad)
53 {
54 unsigned i;
55
56 idx = FFMIN(idx, *count);
57
58 *pads = av_realloc(*pads, sizeof(AVFilterPad) * (*count + 1));
59 *links = av_realloc(*links, sizeof(AVFilterLink*) * (*count + 1));
60 memmove(*pads +idx+1, *pads +idx, sizeof(AVFilterPad) * (*count-idx));
61 memmove(*links+idx+1, *links+idx, sizeof(AVFilterLink*) * (*count-idx));
62 memcpy(*pads+idx, newpad, sizeof(AVFilterPad));
63 (*links)[idx] = NULL;
64
65 (*count) ++;
66 for(i = idx+1; i < *count; i ++)
67 if(*links[i])
68 (*(unsigned *)((uint8_t *)(*links[i]) + padidx_off)) ++;
69 }
70
71 int avfilter_link(AVFilterContext *src, unsigned srcpad,
72 AVFilterContext *dst, unsigned dstpad)
73 {
74 AVFilterLink *link;
75
76 if(src->output_count <= srcpad || dst->input_count <= dstpad ||
77 src->outputs[srcpad] || dst->inputs[dstpad])
78 return -1;
79
80 src->outputs[srcpad] =
81 dst->inputs[dstpad] = link = av_malloc(sizeof(AVFilterLink));
82
83 link->src = src;
84 link->dst = dst;
85 link->srcpad = srcpad;
86 link->dstpad = dstpad;
87 link->cur_pic = NULL;
88 link->format = -1;
89
90 return 0;
91 }
92
93 int avfilter_config_link(AVFilterLink *link)
94 {
95 int *fmts[2], i, j;
96 int (*config_link)(AVFilterLink *);
97
98 if(!link)
99 return 0;
100
101 /* find a format both filters support - TODO: auto-insert conversion filter */
102 link->format = -1;
103 if(link->src->output_pads[link->srcpad].query_formats)
104 fmts[0] = link->src->output_pads[link->srcpad].query_formats(link);
105 else
106 fmts[0] = avfilter_default_query_output_formats(link);
107 fmts[1] = link->dst->input_pads[link->dstpad].query_formats(link);
108 for(i = 0; fmts[0][i] != -1; i ++)
109 for(j = 0; fmts[1][j] != -1; j ++)
110 if(fmts[0][i] == fmts[1][j]) {
111 link->format = fmts[0][i];
112 goto format_done;
113 }
114
115 format_done:
116 av_free(fmts[0]);
117 av_free(fmts[1]);
118 if(link->format == -1)
119 return -1;
120
121 if(!(config_link = link->src->output_pads[link->srcpad].config_props))
122 config_link = avfilter_default_config_output_link;
123 if(config_link(link))
124 return -1;
125
126 if(!(config_link = link->dst->input_pads[link->dstpad].config_props))
127 config_link = avfilter_default_config_input_link;
128 if(config_link(link))
129 return -1;
130
131 return 0;
132 }
133
134 AVFilterPicRef *avfilter_get_video_buffer(AVFilterLink *link, int perms)
135 {
136 AVFilterPicRef *ret = NULL;
137
138 if(link->dst->input_pads[link->dstpad].get_video_buffer)
139 ret = link->dst->input_pads[link->dstpad].get_video_buffer(link, perms);
140
141 if(!ret)
142 ret = avfilter_default_get_video_buffer(link, perms);
143
144 return ret;
145 }
146
147 void avfilter_request_frame(AVFilterLink *link)
148 {
149 const AVFilterPad *pad = &link->src->output_pads[link->srcpad];
150
151 if(pad->request_frame)
152 pad->request_frame(link);
153 else if(link->src->inputs[0])
154 avfilter_request_frame(link->src->inputs[0]);
155 }
156
157 /* XXX: should we do the duplicating of the picture ref here, instead of
158 * forcing the source filter to do it? */
159 void avfilter_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
160 {
161 void (*start_frame)(AVFilterLink *, AVFilterPicRef *);
162
163 start_frame = link->dst->input_pads[link->dstpad].start_frame;
164 if(!start_frame)
165 start_frame = avfilter_default_start_frame;
166
167 start_frame(link, picref);
168 }
169
170 void avfilter_end_frame(AVFilterLink *link)
171 {
172 void (*end_frame)(AVFilterLink *);
173
174 end_frame = link->dst->input_pads[link->dstpad].end_frame;
175 if(!end_frame)
176 end_frame = avfilter_default_end_frame;
177
178 end_frame(link);
179 }
180
181 void avfilter_draw_slice(AVFilterLink *link, uint8_t *data[4], int y, int h)
182 {
183 if(!link->dst->input_pads[link->dstpad].draw_slice)
184 return;
185
186 link->dst->input_pads[link->dstpad].draw_slice(link, data, y, h);
187 }
188
189 static int filter_cmp(const void *aa, const void *bb)
190 {
191 const AVFilter *a = *(const AVFilter **)aa, *b = *(const AVFilter **)bb;
192 return strcmp(a->name, b->name);
193 }
194
195 AVFilter *avfilter_get_by_name(char *name)
196 {
197 AVFilter key = { .name = name, };
198 AVFilter *key2 = &key;
199 AVFilter **ret;
200
201 ret = bsearch(&key2, filters, filter_count, sizeof(AVFilter **), filter_cmp);
202 if(ret)
203 return *ret;
204 return NULL;
205 }
206
207 /* FIXME: insert in order, rather than insert at end + resort */
208 void avfilter_register(AVFilter *filter)
209 {
210 filters = av_realloc(filters, sizeof(AVFilter*) * (filter_count+1));
211 filters[filter_count] = filter;
212 qsort(filters, ++filter_count, sizeof(AVFilter **), filter_cmp);
213 }
214
215 void avfilter_init(void)
216 {
217 avfilter_register(&vsrc_dummy);
218 avfilter_register(&vsrc_ppm);
219 avfilter_register(&vf_crop);
220 avfilter_register(&vf_graph);
221 avfilter_register(&vf_passthrough);
222 avfilter_register(&vf_rgb2bgr);
223 avfilter_register(&vf_slicify);
224 avfilter_register(&vf_vflip);
225 avfilter_register(&vo_sdl);
226 }
227
228 void avfilter_uninit(void)
229 {
230 av_freep(&filters);
231 filter_count = 0;
232 }
233
234 static int pad_count(const AVFilterPad *pads)
235 {
236 AVFilterPad *p = (AVFilterPad *) pads;
237 int count;
238
239 for(count = 0; p->name; count ++) p ++;
240 return count;
241 }
242
243 static const char *filter_name(void *p)
244 {
245 AVFilterContext *filter = p;
246 return filter->filter->name;
247 }
248
249 AVFilterContext *avfilter_create(AVFilter *filter, char *inst_name)
250 {
251 AVFilterContext *ret = av_malloc(sizeof(AVFilterContext));
252
253 ret->av_class = av_mallocz(sizeof(AVClass));
254 ret->av_class->item_name = filter_name;
255 ret->filter = filter;
256 ret->name = inst_name ? av_strdup(inst_name) : NULL;
257 ret->priv = av_mallocz(filter->priv_size);
258
259 ret->input_count = pad_count(filter->inputs);
260 ret->input_pads = av_malloc(sizeof(AVFilterPad) * ret->input_count);
261 memcpy(ret->input_pads, filter->inputs, sizeof(AVFilterPad)*ret->input_count);
262 ret->inputs = av_mallocz(sizeof(AVFilterLink*) * ret->input_count);
263
264 ret->output_count = pad_count(filter->outputs);
265 ret->output_pads = av_malloc(sizeof(AVFilterPad) * ret->output_count);
266 memcpy(ret->output_pads, filter->outputs, sizeof(AVFilterPad)*ret->output_count);
267 ret->outputs = av_mallocz(sizeof(AVFilterLink*) * ret->output_count);
268
269 return ret;
270 }
271
272 void avfilter_destroy(AVFilterContext *filter)
273 {
274 int i;
275
276 if(filter->filter->uninit)
277 filter->filter->uninit(filter);
278
279 for(i = 0; i < filter->input_count; i ++) {
280 if(filter->inputs[i])
281 filter->inputs[i]->src->outputs[filter->inputs[i]->srcpad] = NULL;
282 av_free(filter->inputs[i]);
283 }
284 for(i = 0; i < filter->output_count; i ++) {
285 if(filter->outputs[i])
286 filter->outputs[i]->dst->inputs[filter->outputs[i]->dstpad] = NULL;
287 av_free(filter->outputs[i]);
288 }
289
290 av_free(filter->name);
291 av_free(filter->input_pads);
292 av_free(filter->output_pads);
293 av_free(filter->inputs);
294 av_free(filter->outputs);
295 av_free(filter->priv);
296 av_free(filter->av_class);
297 av_free(filter);
298 }
299
300 AVFilterContext *avfilter_create_by_name(char *name, char *inst_name)
301 {
302 AVFilter *filt;
303
304 if(!(filt = avfilter_get_by_name(name))) return NULL;
305 return avfilter_create(filt, inst_name);
306 }
307
308 int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque)
309 {
310 int ret;
311
312 if(filter->filter->init)
313 if((ret = filter->filter->init(filter, args, opaque))) return ret;
314 return 0;
315 }
316
317 int *avfilter_make_format_list(int len, ...)
318 {
319 int *ret, i;
320 va_list vl;
321
322 ret = av_malloc(sizeof(int) * (len + 1));
323 va_start(vl, len);
324 for(i = 0; i < len; i ++)
325 ret[i] = va_arg(vl, int);
326 va_end(vl);
327 ret[len] = -1;
328
329 return ret;
330 }
331