Add horizontal 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 */
31 struct FilterList
32 {
33 AVFilter *filter;
34 struct FilterList *next;
35 } *filters = NULL;
36
37 /** helper macros to get the in/out pad on the dst/src filter */
38 #define link_dpad(link) link->dst-> input_pads[link->dstpad]
39 #define link_spad(link) link->src->output_pads[link->srcpad]
40
41 AVFilterPicRef *avfilter_ref_pic(AVFilterPicRef *ref, int pmask)
42 {
43 AVFilterPicRef *ret = av_malloc(sizeof(AVFilterPicRef));
44 *ret = *ref;
45 ret->perms &= pmask;
46 ret->pic->refcount ++;
47 return ret;
48 }
49
50 void avfilter_unref_pic(AVFilterPicRef *ref)
51 {
52 if(-- ref->pic->refcount == 0)
53 ref->pic->free(ref->pic);
54 av_free(ref);
55 }
56
57 void avfilter_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
58 AVFilterPad **pads, AVFilterLink ***links,
59 AVFilterPad *newpad)
60 {
61 unsigned i;
62
63 idx = FFMIN(idx, *count);
64
65 *pads = av_realloc(*pads, sizeof(AVFilterPad) * (*count + 1));
66 *links = av_realloc(*links, sizeof(AVFilterLink*) * (*count + 1));
67 memmove(*pads +idx+1, *pads +idx, sizeof(AVFilterPad) * (*count-idx));
68 memmove(*links+idx+1, *links+idx, sizeof(AVFilterLink*) * (*count-idx));
69 memcpy(*pads+idx, newpad, sizeof(AVFilterPad));
70 (*links)[idx] = NULL;
71
72 (*count) ++;
73 for(i = idx+1; i < *count; i ++)
74 if(*links[i])
75 (*(unsigned *)((uint8_t *)(*links[i]) + padidx_off)) ++;
76 }
77
78 int avfilter_link(AVFilterContext *src, unsigned srcpad,
79 AVFilterContext *dst, unsigned dstpad)
80 {
81 AVFilterLink *link;
82
83 if(src->output_count <= srcpad || dst->input_count <= dstpad ||
84 src->outputs[srcpad] || dst->inputs[dstpad])
85 return -1;
86
87 src->outputs[srcpad] =
88 dst->inputs[dstpad] = link = av_mallocz(sizeof(AVFilterLink));
89
90 link->src = src;
91 link->dst = dst;
92 link->srcpad = srcpad;
93 link->dstpad = dstpad;
94 link->format = -1;
95
96 return 0;
97 }
98
99 int avfilter_insert_filter(AVFilterLink *link, AVFilterContext *filt,
100 unsigned in, unsigned out)
101 {
102 AVFilterFormats *formats;
103
104 av_log(NULL, AV_LOG_INFO, "auto-inserting filter '%s'\n",
105 filt->filter->name);
106
107 link->dst->inputs[link->dstpad] = NULL;
108 if(avfilter_link(filt, out, link->dst, link->dstpad)) {
109 /* failed to link output filter to new filter */
110 link->dst->inputs[link->dstpad] = link;
111 return -1;
112 }
113
114 /* re-hookup the link to the new destination filter we inserted */
115 link->dst = filt;
116 link->dstpad = in;
117 filt->inputs[in] = link;
118
119 /* if any information on supported colorspaces already exists on the
120 * link, we need to preserve that */
121 if((formats = link->out_formats))
122 avfilter_formats_changeref(&link->out_formats,
123 &filt->outputs[out]->out_formats);
124
125 return 0;
126 }
127
128 int avfilter_config_link(AVFilterLink *link)
129 {
130 int (*config_link)(AVFilterLink *);
131
132 if(!link)
133 return 0;
134
135 if(!(config_link = link_spad(link).config_props))
136 config_link = avfilter_default_config_output_link;
137 if(config_link(link))
138 return -1;
139
140 if(!(config_link = link_dpad(link).config_props))
141 config_link = avfilter_default_config_input_link;
142 if(config_link(link))
143 return -1;
144
145 return 0;
146 }
147
148 AVFilterPicRef *avfilter_get_video_buffer(AVFilterLink *link, int perms)
149 {
150 AVFilterPicRef *ret = NULL;
151
152 if(link_dpad(link).get_video_buffer)
153 ret = link_dpad(link).get_video_buffer(link, perms);
154
155 if(!ret)
156 ret = avfilter_default_get_video_buffer(link, perms);
157
158 return ret;
159 }
160
161 int avfilter_request_frame(AVFilterLink *link)
162 {
163 if(link_spad(link).request_frame)
164 return link_spad(link).request_frame(link);
165 else if(link->src->inputs[0])
166 return avfilter_request_frame(link->src->inputs[0]);
167 else return -1;
168 }
169
170 /* XXX: should we do the duplicating of the picture ref here, instead of
171 * forcing the source filter to do it? */
172 void avfilter_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
173 {
174 void (*start_frame)(AVFilterLink *, AVFilterPicRef *);
175
176 if(!(start_frame = link_dpad(link).start_frame))
177 start_frame = avfilter_default_start_frame;
178
179 /* prepare to copy the picture if it has insufficient permissions */
180 if((link_dpad(link).min_perms & picref->perms) != link_dpad(link).min_perms ||
181 link_dpad(link).rej_perms & picref->perms) {
182 av_log(link->dst, AV_LOG_INFO,
183 "frame copy needed (have perms %x, need %x, reject %x)\n",
184 picref->perms,
185 link_dpad(link).min_perms, link_dpad(link).rej_perms);
186
187 link->cur_pic = avfilter_default_get_video_buffer(link, link_dpad(link).min_perms);
188 link->srcpic = picref;
189 }
190 else
191 link->cur_pic = picref;
192
193 start_frame(link, link->cur_pic);
194 }
195
196 void avfilter_end_frame(AVFilterLink *link)
197 {
198 void (*end_frame)(AVFilterLink *);
199
200 /* unreference the source picture if we're feeding the destination filter
201 * a copied version dues to permission issues */
202 if(link->srcpic) {
203 avfilter_unref_pic(link->srcpic);
204 link->srcpic = NULL;
205 }
206
207 if(!(end_frame = link_dpad(link).end_frame))
208 end_frame = avfilter_default_end_frame;
209
210 end_frame(link);
211 }
212
213 void avfilter_draw_slice(AVFilterLink *link, int y, int h)
214 {
215 uint8_t *src[4], *dst[4];
216 int i, j, hsub, vsub;
217
218 /* copy the slice if needed for permission reasons */
219 if(link->srcpic) {
220 avcodec_get_chroma_sub_sample(link->format, &hsub, &vsub);
221
222 src[0] = link->srcpic-> data[0] + y * link->srcpic-> linesize[0];
223 dst[0] = link->cur_pic->data[0] + y * link->cur_pic->linesize[0];
224 for(i = 1; i < 4; i ++) {
225 if(link->srcpic->data[i]) {
226 src[i] = link->srcpic-> data[i] + (y >> vsub) * link->srcpic-> linesize[i];
227 dst[i] = link->cur_pic->data[i] + (y >> vsub) * link->cur_pic->linesize[i];
228 } else
229 src[i] = dst[i] = NULL;
230 }
231 for(j = 0; j < h; j ++) {
232 memcpy(dst[0], src[0], link->cur_pic->linesize[0]);
233 src[0] += link->srcpic ->linesize[0];
234 dst[0] += link->cur_pic->linesize[0];
235 }
236 for(i = 1; i < 4; i ++) {
237 if(!src[i]) continue;
238
239 for(j = 0; j < h >> vsub; j ++) {
240 memcpy(dst[i], src[i], link->cur_pic->linesize[i]);
241 src[i] += link->srcpic ->linesize[i];
242 dst[i] += link->cur_pic->linesize[i];
243 }
244 }
245 }
246
247 if(!link_dpad(link).draw_slice)
248 return;
249
250 link_dpad(link).draw_slice(link, y, h);
251 }
252
253 AVFilter *avfilter_get_by_name(char *name)
254 {
255 struct FilterList *filt;
256
257 for(filt = filters; filt; filt = filt->next)
258 if(!strcmp(filt->filter->name, name))
259 return filt->filter;
260
261 return NULL;
262 }
263
264 void avfilter_register(AVFilter *filter)
265 {
266 struct FilterList *newfilt = av_malloc(sizeof(struct FilterList));
267
268 newfilt->filter = filter;
269 newfilt->next = filters;
270 filters = newfilt;
271 }
272
273 void avfilter_init(void)
274 {
275 avfilter_register(&avfilter_vf_crop);
276 avfilter_register(&avfilter_vf_fifo);
277 avfilter_register(&avfilter_vf_fps);
278 avfilter_register(&avfilter_vf_graph);
279 avfilter_register(&avfilter_vf_graphdesc);
280 avfilter_register(&avfilter_vf_graphfile);
281 avfilter_register(&avfilter_vf_hflip);
282 avfilter_register(&avfilter_vf_negate);
283 avfilter_register(&avfilter_vf_overlay);
284 avfilter_register(&avfilter_vf_passthrough);
285 avfilter_register(&avfilter_vf_scale);
286 avfilter_register(&avfilter_vf_slicify);
287 avfilter_register(&avfilter_vf_split);
288 avfilter_register(&avfilter_vf_vflip);
289 }
290
291 void avfilter_uninit(void)
292 {
293 struct FilterList *tmp;
294
295 for(; filters; filters = tmp) {
296 tmp = filters->next;
297 av_free(filters);
298 }
299 }
300
301 static int pad_count(const AVFilterPad *pads)
302 {
303 AVFilterPad *p = (AVFilterPad *) pads;
304 int count;
305
306 for(count = 0; p->name; count ++) p ++;
307 return count;
308 }
309
310 static const char *filter_name(void *p)
311 {
312 AVFilterContext *filter = p;
313 return filter->filter->name;
314 }
315
316 AVFilterContext *avfilter_open(AVFilter *filter, char *inst_name)
317 {
318 AVFilterContext *ret;
319
320 if (!filter)
321 return 0;
322
323 ret = av_malloc(sizeof(AVFilterContext));
324
325 ret->av_class = av_mallocz(sizeof(AVClass));
326 ret->av_class->item_name = filter_name;
327 ret->filter = filter;
328 ret->name = inst_name ? av_strdup(inst_name) : NULL;
329 ret->priv = av_mallocz(filter->priv_size);
330
331 ret->input_count = pad_count(filter->inputs);
332 ret->input_pads = av_malloc(sizeof(AVFilterPad) * ret->input_count);
333 memcpy(ret->input_pads, filter->inputs, sizeof(AVFilterPad)*ret->input_count);
334 ret->inputs = av_mallocz(sizeof(AVFilterLink*) * ret->input_count);
335
336 ret->output_count = pad_count(filter->outputs);
337 ret->output_pads = av_malloc(sizeof(AVFilterPad) * ret->output_count);
338 memcpy(ret->output_pads, filter->outputs, sizeof(AVFilterPad)*ret->output_count);
339 ret->outputs = av_mallocz(sizeof(AVFilterLink*) * ret->output_count);
340
341 return ret;
342 }
343
344 void avfilter_destroy(AVFilterContext *filter)
345 {
346 int i;
347
348 if(filter->filter->uninit)
349 filter->filter->uninit(filter);
350
351 for(i = 0; i < filter->input_count; i ++) {
352 if(filter->inputs[i])
353 filter->inputs[i]->src->outputs[filter->inputs[i]->srcpad] = NULL;
354 av_freep(&filter->inputs[i]);
355 }
356 for(i = 0; i < filter->output_count; i ++) {
357 if(filter->outputs[i])
358 filter->outputs[i]->dst->inputs[filter->outputs[i]->dstpad] = NULL;
359 av_freep(&filter->outputs[i]);
360 }
361
362 av_freep(&filter->name);
363 av_freep(&filter->input_pads);
364 av_freep(&filter->output_pads);
365 av_freep(&filter->inputs);
366 av_freep(&filter->outputs);
367 av_freep(&filter->priv);
368 av_freep(&filter->av_class);
369 av_free(filter);
370 }
371
372 int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque)
373 {
374 int ret;
375
376 if(filter->filter->init)
377 if((ret = filter->filter->init(filter, args, opaque))) return ret;
378 return 0;
379 }
380