3 * copyright (c) 2007 Bobby Bingham
5 * This file is part of FFmpeg.
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.
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.
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
28 #include "allfilters.h"
30 /** list of registered filters, sorted by name */
31 static int filter_count = 0;
32 static AVFilter **filters = NULL;
34 /* TODO: buffer pool. see comment for avfilter_default_get_video_buffer() */
35 void avfilter_default_free_video_buffer(AVFilterPic *pic)
37 avpicture_free((AVPicture *) pic);
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. */
44 AVFilterPicRef *avfilter_default_get_video_buffer(AVFilterLink *link, int perms)
46 AVFilterPic *pic = av_mallocz(sizeof(AVFilterPic));
47 AVFilterPicRef *ref = av_mallocz(sizeof(AVFilterPicRef));
55 pic->format = link->format;
56 pic->free = avfilter_default_free_video_buffer;
57 avpicture_alloc((AVPicture *)pic, pic->format, ref->w, ref->h);
59 memcpy(ref->data, pic->data, sizeof(pic->data));
60 memcpy(ref->linesize, pic->linesize, sizeof(pic->linesize));
65 void avfilter_default_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
67 link->cur_pic = picref;
70 void avfilter_default_end_frame(AVFilterLink *link)
72 avfilter_unref_pic(link->cur_pic);
76 AVFilterPicRef *avfilter_ref_pic(AVFilterPicRef *ref)
78 AVFilterPicRef *ret = av_malloc(sizeof(AVFilterPicRef));
79 memcpy(ret, ref, sizeof(AVFilterPicRef));
80 ret->pic->refcount ++;
84 void avfilter_unref_pic(AVFilterPicRef *ref)
86 if(-- ref->pic->refcount == 0)
87 ref->pic->free(ref->pic);
92 * default config_link() implementation for output video links to simplify
93 * the implementation of one input one output video filters */
94 static int default_config_output_link(AVFilterLink *link)
96 link->w = link->src->inputs[0]->w;
97 link->h = link->src->inputs[0]->h;
103 * default query_formats() implementation for output video links to simplify
104 * the implementation of one input one output video filters */
105 static int *default_query_output_formats(AVFilterLink *link)
107 return avfilter_make_format_list(1, link->src->inputs[0]->format);
110 int avfilter_link(AVFilterContext *src, unsigned srcpad,
111 AVFilterContext *dst, unsigned dstpad)
116 if(src->outputs[srcpad] || dst->inputs[dstpad])
119 src->outputs[srcpad] =
120 dst->inputs[dstpad] = link = av_malloc(sizeof(AVFilterLink));
124 link->srcpad = srcpad;
125 link->dstpad = dstpad;
126 link->cur_pic = NULL;
128 /* find a format both filters support - TODO: auto-insert conversion filter */
129 if(src->filter->outputs[srcpad].query_formats)
130 fmts[0] = src->filter->outputs[srcpad].query_formats(link);
132 fmts[0] = default_query_output_formats(link);
133 fmts[1] = dst->filter-> inputs[dstpad].query_formats(link);
134 for(i = 0; fmts[0][i] != -1; i ++)
135 for(j = 0; fmts[1][j] != -1; j ++)
136 if(fmts[0][i] == fmts[1][j]) {
137 link->format = fmts[0][i];
144 if(link->format == -1) {
145 /* failed to find a format. fail at creating the link */
147 src->outputs[srcpad] = NULL;
148 dst->inputs[dstpad] = NULL;
152 if (src->filter->outputs[srcpad].config_props)
153 src->filter->outputs[srcpad].config_props(link);
155 default_config_output_link(link);
157 if (dst->filter->inputs[dstpad].config_props)
158 dst->filter->inputs[dstpad].config_props(link);
163 AVFilterPicRef *avfilter_get_video_buffer(AVFilterLink *link, int perms)
165 AVFilterPicRef *ret = NULL;
167 if(link->dst->filter->inputs[link->dstpad].get_video_buffer)
168 ret = link->dst->filter->inputs[link->dstpad].get_video_buffer(link, perms);
171 ret = avfilter_default_get_video_buffer(link, perms);
176 void avfilter_request_frame(AVFilterLink *link)
178 link->src->filter->outputs[link->srcpad].request_frame(link);
181 /* XXX: should we do the duplicating of the picture ref here, instead of
182 * forcing the source filter to do it? */
183 void avfilter_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
185 void (*start_frame)(AVFilterLink *, AVFilterPicRef *);
187 start_frame = link->dst->filter->inputs[link->dstpad].start_frame;
189 start_frame = avfilter_default_start_frame;
191 start_frame(link, picref);
194 void avfilter_end_frame(AVFilterLink *link)
196 void (*end_frame)(AVFilterLink *);
198 end_frame = link->dst->filter->inputs[link->dstpad].end_frame;
200 end_frame = avfilter_default_end_frame;
205 void avfilter_draw_slice(AVFilterLink *link, uint8_t *data[4], int y, int h)
207 link->dst->filter->inputs[link->dstpad].draw_slice(link, data, y, h);
210 static int filter_cmp(const void *aa, const void *bb)
212 const AVFilter *a = *(const AVFilter **)aa, *b = *(const AVFilter **)bb;
213 return strcmp(a->name, b->name);
216 AVFilter *avfilter_get_by_name(char *name)
218 AVFilter key = { .name = name, };
219 AVFilter *key2 = &key;
222 ret = bsearch(&key2, filters, filter_count, sizeof(AVFilter **), filter_cmp);
228 /* FIXME: insert in order, rather than insert at end + resort */
229 void avfilter_register(AVFilter *filter)
231 filters = av_realloc(filters, sizeof(AVFilter*) * (filter_count+1));
232 filters[filter_count] = filter;
233 qsort(filters, ++filter_count, sizeof(AVFilter **), filter_cmp);
236 void avfilter_init(void)
238 avfilter_register(&vsrc_dummy);
239 avfilter_register(&vf_crop);
240 avfilter_register(&vf_passthrough);
241 avfilter_register(&vo_sdl);
244 void avfilter_uninit(void)
250 static int pad_count(const AVFilterPad *pads)
252 AVFilterPad *p = (AVFilterPad *) pads;
255 for(count = 0; p->name; count ++) p ++;
259 static const char *filter_name(void *p)
261 AVFilterContext *filter = p;
262 return filter->filter->name;
265 AVFilterContext *avfilter_create(AVFilter *filter)
267 AVFilterContext *ret = av_malloc(sizeof(AVFilterContext));
269 ret->av_class = av_mallocz(sizeof(AVClass));
270 ret->av_class->item_name = filter_name;
271 ret->filter = filter;
272 ret->inputs = av_mallocz(sizeof(AVFilterLink*) * pad_count(filter->inputs));
273 ret->outputs = av_mallocz(sizeof(AVFilterLink*) * pad_count(filter->outputs));
274 ret->priv = av_mallocz(filter->priv_size);
279 void avfilter_destroy(AVFilterContext *filter)
283 if(filter->filter->uninit)
284 filter->filter->uninit(filter);
286 for(i = 0; i < pad_count(filter->filter->inputs); i ++) {
287 if(filter->inputs[i])
288 filter->inputs[i]->src->outputs[filter->inputs[i]->srcpad] = NULL;
289 av_free(filter->inputs[i]);
291 for(i = 0; i < pad_count(filter->filter->outputs); i ++) {
292 if(filter->outputs[i])
293 filter->outputs[i]->dst->inputs[filter->outputs[i]->dstpad] = NULL;
294 av_free(filter->outputs[i]);
297 av_free(filter->inputs);
298 av_free(filter->outputs);
299 av_free(filter->priv);
300 av_free(filter->av_class);
304 AVFilterContext *avfilter_create_by_name(char *name)
308 if(!(filt = avfilter_get_by_name(name))) return NULL;
309 return avfilter_create(filt);
312 int avfilter_init_filter(AVFilterContext *filter, const char *args)
316 if(filter->filter->init)
317 if((ret = filter->filter->init(filter, args))) return ret;
321 int *avfilter_make_format_list(int len, ...)
326 ret = av_malloc(sizeof(int) * (len + 1));
328 for(i = 0; i < len; i ++)
329 ret[i] = va_arg(vl, int);