Adjust the default start_frame() and end_frame() implementations to simplify
[libav.git] / libavfilter / avfilter.c
CommitLineData
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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
e0752603 22#include <stdarg.h>
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23#include <stdlib.h>
24#include <string.h>
25#include <stdio.h>
26
27#include "avfilter.h"
d72a138e 28#include "allfilters.h"
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29
30/** list of registered filters, sorted by name */
31static int filter_count = 0;
32static AVFilter **filters = NULL;
33
34/* TODO: buffer pool. see comment for avfilter_default_get_video_buffer() */
35void 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. */
44AVFilterPicRef *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
92beffdc 59 memcpy(ref->data, pic->data, sizeof(pic->data));
a4ca7389 60 memcpy(ref->linesize, pic->linesize, sizeof(pic->linesize));
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61
62 return ref;
63}
64
65void avfilter_default_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
66{
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67 AVFilterLink *out = link->dst->outputs[0];
68
4dbbcdee 69 link->cur_pic = picref;
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70
71 if(out) {
72 out->outpic = avfilter_get_video_buffer(out, AV_PERM_WRITE);
73 avfilter_start_frame(out, avfilter_ref_pic(out->outpic, ~0));
74 }
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75}
76
77void avfilter_default_end_frame(AVFilterLink *link)
78{
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79 AVFilterLink *out = link->dst->outputs[0];
80
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81 avfilter_unref_pic(link->cur_pic);
82 link->cur_pic = NULL;
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83
84 if(out) {
85 avfilter_unref_pic(out->outpic);
86 out->outpic = NULL;
87 avfilter_end_frame(out);
88 }
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89}
90
efb36bfc 91AVFilterPicRef *avfilter_ref_pic(AVFilterPicRef *ref, int pmask)
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92{
93 AVFilterPicRef *ret = av_malloc(sizeof(AVFilterPicRef));
94 memcpy(ret, ref, sizeof(AVFilterPicRef));
efb36bfc 95 ret->perms &= pmask;
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96 ret->pic->refcount ++;
97 return ret;
98}
99
100void avfilter_unref_pic(AVFilterPicRef *ref)
101{
102 if(-- ref->pic->refcount == 0)
103 ref->pic->free(ref->pic);
104 av_free(ref);
105}
106
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107/**
108 * default config_link() implementation for output video links to simplify
109 * the implementation of one input one output video filters */
110static int default_config_output_link(AVFilterLink *link)
111{
112 link->w = link->src->inputs[0]->w;
113 link->h = link->src->inputs[0]->h;
114
115 return 0;
116}
117
118/**
119 * default query_formats() implementation for output video links to simplify
120 * the implementation of one input one output video filters */
121static int *default_query_output_formats(AVFilterLink *link)
122{
123 return avfilter_make_format_list(1, link->src->inputs[0]->format);
124}
125
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126int avfilter_link(AVFilterContext *src, unsigned srcpad,
127 AVFilterContext *dst, unsigned dstpad)
128{
129 AVFilterLink *link;
e0752603 130 int *fmts[2], i, j;
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131
132 if(src->outputs[srcpad] || dst->inputs[dstpad])
133 return -1;
134
135 src->outputs[srcpad] =
136 dst->inputs[dstpad] = link = av_malloc(sizeof(AVFilterLink));
137
138 link->src = src;
139 link->dst = dst;
140 link->srcpad = srcpad;
141 link->dstpad = dstpad;
142 link->cur_pic = NULL;
143
e0752603 144 /* find a format both filters support - TODO: auto-insert conversion filter */
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145 if(src->filter->outputs[srcpad].query_formats)
146 fmts[0] = src->filter->outputs[srcpad].query_formats(link);
147 else
148 fmts[0] = default_query_output_formats(link);
ba6b9035 149 fmts[1] = dst->filter-> inputs[dstpad].query_formats(link);
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150 for(i = 0; fmts[0][i] != -1; i ++)
151 for(j = 0; fmts[1][j] != -1; j ++)
152 if(fmts[0][i] == fmts[1][j]) {
153 link->format = fmts[0][i];
154 goto format_done;
155 }
156
157format_done:
158 av_free(fmts[0]);
159 av_free(fmts[1]);
160 if(link->format == -1) {
161 /* failed to find a format. fail at creating the link */
162 av_free(link);
163 src->outputs[srcpad] = NULL;
164 dst->inputs[dstpad] = NULL;
165 return -1;
166 }
167
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168 if (src->filter->outputs[srcpad].config_props)
169 src->filter->outputs[srcpad].config_props(link);
170 else
171 default_config_output_link(link);
172
173 if (dst->filter->inputs[dstpad].config_props)
174 dst->filter->inputs[dstpad].config_props(link);
175
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176 return 0;
177}
178
179AVFilterPicRef *avfilter_get_video_buffer(AVFilterLink *link, int perms)
180{
181 AVFilterPicRef *ret = NULL;
182
183 if(link->dst->filter->inputs[link->dstpad].get_video_buffer)
184 ret = link->dst->filter->inputs[link->dstpad].get_video_buffer(link, perms);
185
186 if(!ret)
187 ret = avfilter_default_get_video_buffer(link, perms);
188
189 return ret;
190}
191
192void avfilter_request_frame(AVFilterLink *link)
193{
194 link->src->filter->outputs[link->srcpad].request_frame(link);
195}
196
197/* XXX: should we do the duplicating of the picture ref here, instead of
198 * forcing the source filter to do it? */
199void avfilter_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
200{
201 void (*start_frame)(AVFilterLink *, AVFilterPicRef *);
202
203 start_frame = link->dst->filter->inputs[link->dstpad].start_frame;
204 if(!start_frame)
205 start_frame = avfilter_default_start_frame;
206
207 start_frame(link, picref);
208}
209
210void avfilter_end_frame(AVFilterLink *link)
211{
212 void (*end_frame)(AVFilterLink *);
213
214 end_frame = link->dst->filter->inputs[link->dstpad].end_frame;
215 if(!end_frame)
216 end_frame = avfilter_default_end_frame;
217
218 end_frame(link);
219}
220
221void avfilter_draw_slice(AVFilterLink *link, uint8_t *data[4], int y, int h)
222{
223 link->dst->filter->inputs[link->dstpad].draw_slice(link, data, y, h);
224}
225
226static int filter_cmp(const void *aa, const void *bb)
227{
228 const AVFilter *a = *(const AVFilter **)aa, *b = *(const AVFilter **)bb;
229 return strcmp(a->name, b->name);
230}
231
232AVFilter *avfilter_get_by_name(char *name)
233{
234 AVFilter key = { .name = name, };
235 AVFilter *key2 = &key;
236 AVFilter **ret;
237
238 ret = bsearch(&key2, filters, filter_count, sizeof(AVFilter **), filter_cmp);
239 if(ret)
240 return *ret;
241 return NULL;
242}
243
244/* FIXME: insert in order, rather than insert at end + resort */
245void avfilter_register(AVFilter *filter)
246{
247 filters = av_realloc(filters, sizeof(AVFilter*) * (filter_count+1));
248 filters[filter_count] = filter;
249 qsort(filters, ++filter_count, sizeof(AVFilter **), filter_cmp);
250}
251
252void avfilter_init(void)
253{
d72a138e 254 avfilter_register(&vsrc_dummy);
eaf7eb66 255 avfilter_register(&vsrc_ppm);
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256 avfilter_register(&vf_crop);
257 avfilter_register(&vf_passthrough);
72e3037a 258 avfilter_register(&vf_rgb2bgr);
ce356b09 259 avfilter_register(&vf_slicify);
d72a138e 260 avfilter_register(&vo_sdl);
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261}
262
263void avfilter_uninit(void)
264{
265 av_freep(&filters);
266 filter_count = 0;
267}
268
269static int pad_count(const AVFilterPad *pads)
270{
271 AVFilterPad *p = (AVFilterPad *) pads;
272 int count;
273
274 for(count = 0; p->name; count ++) p ++;
275 return count;
276}
277
278static const char *filter_name(void *p)
279{
280 AVFilterContext *filter = p;
281 return filter->filter->name;
282}
283
284AVFilterContext *avfilter_create(AVFilter *filter)
285{
286 AVFilterContext *ret = av_malloc(sizeof(AVFilterContext));
287
288 ret->av_class = av_mallocz(sizeof(AVClass));
289 ret->av_class->item_name = filter_name;
290 ret->filter = filter;
291 ret->inputs = av_mallocz(sizeof(AVFilterLink*) * pad_count(filter->inputs));
292 ret->outputs = av_mallocz(sizeof(AVFilterLink*) * pad_count(filter->outputs));
293 ret->priv = av_mallocz(filter->priv_size);
294
295 return ret;
296}
297
298void avfilter_destroy(AVFilterContext *filter)
299{
300 int i;
301
302 if(filter->filter->uninit)
303 filter->filter->uninit(filter);
304
305 for(i = 0; i < pad_count(filter->filter->inputs); i ++) {
306 if(filter->inputs[i])
307 filter->inputs[i]->src->outputs[filter->inputs[i]->srcpad] = NULL;
308 av_free(filter->inputs[i]);
309 }
310 for(i = 0; i < pad_count(filter->filter->outputs); i ++) {
311 if(filter->outputs[i])
312 filter->outputs[i]->dst->inputs[filter->outputs[i]->dstpad] = NULL;
313 av_free(filter->outputs[i]);
314 }
315
316 av_free(filter->inputs);
317 av_free(filter->outputs);
318 av_free(filter->priv);
319 av_free(filter->av_class);
320 av_free(filter);
321}
322
323AVFilterContext *avfilter_create_by_name(char *name)
324{
325 AVFilter *filt;
326
327 if(!(filt = avfilter_get_by_name(name))) return NULL;
328 return avfilter_create(filt);
329}
330
89e64908 331int avfilter_init_filter(AVFilterContext *filter, const char *args)
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332{
333 int ret, i;
334
335 if(filter->filter->init)
89e64908 336 if((ret = filter->filter->init(filter, args))) return ret;
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337 return 0;
338}
339
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340int *avfilter_make_format_list(int len, ...)
341{
342 int *ret, i;
343 va_list vl;
344
345 ret = av_malloc(sizeof(int) * (len + 1));
346 va_start(vl, len);
347 for(i = 0; i < len; i ++)
348 ret[i] = va_arg(vl, int);
349 va_end(vl);
350 ret[len] = -1;
351
352 return ret;
353}
354