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 AVFilterLink *out = link->dst->outputs[0];
69 link->cur_pic = picref;
72 out->outpic = avfilter_get_video_buffer(out, AV_PERM_WRITE);
73 avfilter_start_frame(out, avfilter_ref_pic(out->outpic, ~0));
77 void avfilter_default_end_frame(AVFilterLink *link)
79 AVFilterLink *out = link->dst->outputs[0];
81 avfilter_unref_pic(link->cur_pic);
85 avfilter_unref_pic(out->outpic);
87 avfilter_end_frame(out);
91 AVFilterPicRef *avfilter_ref_pic(AVFilterPicRef *ref, int pmask)
93 AVFilterPicRef *ret = av_malloc(sizeof(AVFilterPicRef));
94 memcpy(ret, ref, sizeof(AVFilterPicRef));
96 ret->pic->refcount ++;
100 void avfilter_unref_pic(AVFilterPicRef *ref)
102 if(-- ref->pic->refcount == 0)
103 ref->pic->free(ref->pic);
108 * default config_link() implementation for output video links to simplify
109 * the implementation of one input one output video filters */
110 static int default_config_output_link(AVFilterLink *link)
112 link->w = link->src->inputs[0]->w;
113 link->h = link->src->inputs[0]->h;
119 * default query_formats() implementation for output video links to simplify
120 * the implementation of one input one output video filters */
121 static int *default_query_output_formats(AVFilterLink *link)
123 return avfilter_make_format_list(1, link->src->inputs[0]->format);
126 int avfilter_link(AVFilterContext *src, unsigned srcpad,
127 AVFilterContext *dst, unsigned dstpad)
132 if(src->outputs[srcpad] || dst->inputs[dstpad])
135 src->outputs[srcpad] =
136 dst->inputs[dstpad] = link = av_malloc(sizeof(AVFilterLink));
140 link->srcpad = srcpad;
141 link->dstpad = dstpad;
142 link->cur_pic = NULL;
144 /* find a format both filters support - TODO: auto-insert conversion filter */
145 if(src->filter->outputs[srcpad].query_formats)
146 fmts[0] = src->filter->outputs[srcpad].query_formats(link);
148 fmts[0] = default_query_output_formats(link);
149 fmts[1] = dst->filter-> inputs[dstpad].query_formats(link);
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];
160 if(link->format == -1) {
161 /* failed to find a format. fail at creating the link */
163 src->outputs[srcpad] = NULL;
164 dst->inputs[dstpad] = NULL;
168 if (src->filter->outputs[srcpad].config_props)
169 src->filter->outputs[srcpad].config_props(link);
171 default_config_output_link(link);
173 if (dst->filter->inputs[dstpad].config_props)
174 dst->filter->inputs[dstpad].config_props(link);
179 AVFilterPicRef *avfilter_get_video_buffer(AVFilterLink *link, int perms)
181 AVFilterPicRef *ret = NULL;
183 if(link->dst->filter->inputs[link->dstpad].get_video_buffer)
184 ret = link->dst->filter->inputs[link->dstpad].get_video_buffer(link, perms);
187 ret = avfilter_default_get_video_buffer(link, perms);
192 void avfilter_request_frame(AVFilterLink *link)
194 const AVFilterPad *pad = &link->src->filter->outputs[link->srcpad];
196 if(pad->request_frame)
197 pad->request_frame(link);
198 else if(link->src->inputs[0])
199 avfilter_request_frame(link->src->inputs[0]);
202 /* XXX: should we do the duplicating of the picture ref here, instead of
203 * forcing the source filter to do it? */
204 void avfilter_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
206 void (*start_frame)(AVFilterLink *, AVFilterPicRef *);
208 start_frame = link->dst->filter->inputs[link->dstpad].start_frame;
210 start_frame = avfilter_default_start_frame;
212 start_frame(link, picref);
215 void avfilter_end_frame(AVFilterLink *link)
217 void (*end_frame)(AVFilterLink *);
219 end_frame = link->dst->filter->inputs[link->dstpad].end_frame;
221 end_frame = avfilter_default_end_frame;
226 void avfilter_draw_slice(AVFilterLink *link, uint8_t *data[4], int y, int h)
228 link->dst->filter->inputs[link->dstpad].draw_slice(link, data, y, h);
231 static int filter_cmp(const void *aa, const void *bb)
233 const AVFilter *a = *(const AVFilter **)aa, *b = *(const AVFilter **)bb;
234 return strcmp(a->name, b->name);
237 AVFilter *avfilter_get_by_name(char *name)
239 AVFilter key = { .name = name, };
240 AVFilter *key2 = &key;
243 ret = bsearch(&key2, filters, filter_count, sizeof(AVFilter **), filter_cmp);
249 /* FIXME: insert in order, rather than insert at end + resort */
250 void avfilter_register(AVFilter *filter)
252 filters = av_realloc(filters, sizeof(AVFilter*) * (filter_count+1));
253 filters[filter_count] = filter;
254 qsort(filters, ++filter_count, sizeof(AVFilter **), filter_cmp);
257 void avfilter_init(void)
259 avfilter_register(&vsrc_dummy);
260 avfilter_register(&vsrc_ppm);
261 avfilter_register(&vf_crop);
262 avfilter_register(&vf_passthrough);
263 avfilter_register(&vf_rgb2bgr);
264 avfilter_register(&vf_slicify);
265 avfilter_register(&vo_sdl);
268 void avfilter_uninit(void)
274 static int pad_count(const AVFilterPad *pads)
276 AVFilterPad *p = (AVFilterPad *) pads;
279 for(count = 0; p->name; count ++) p ++;
283 static const char *filter_name(void *p)
285 AVFilterContext *filter = p;
286 return filter->filter->name;
289 AVFilterContext *avfilter_create(AVFilter *filter)
291 AVFilterContext *ret = av_malloc(sizeof(AVFilterContext));
293 ret->av_class = av_mallocz(sizeof(AVClass));
294 ret->av_class->item_name = filter_name;
295 ret->filter = filter;
296 ret->inputs = av_mallocz(sizeof(AVFilterLink*) * pad_count(filter->inputs));
297 ret->outputs = av_mallocz(sizeof(AVFilterLink*) * pad_count(filter->outputs));
298 ret->priv = av_mallocz(filter->priv_size);
303 void avfilter_destroy(AVFilterContext *filter)
307 if(filter->filter->uninit)
308 filter->filter->uninit(filter);
310 for(i = 0; i < pad_count(filter->filter->inputs); i ++) {
311 if(filter->inputs[i])
312 filter->inputs[i]->src->outputs[filter->inputs[i]->srcpad] = NULL;
313 av_free(filter->inputs[i]);
315 for(i = 0; i < pad_count(filter->filter->outputs); i ++) {
316 if(filter->outputs[i])
317 filter->outputs[i]->dst->inputs[filter->outputs[i]->dstpad] = NULL;
318 av_free(filter->outputs[i]);
321 av_free(filter->inputs);
322 av_free(filter->outputs);
323 av_free(filter->priv);
324 av_free(filter->av_class);
328 AVFilterContext *avfilter_create_by_name(char *name)
332 if(!(filt = avfilter_get_by_name(name))) return NULL;
333 return avfilter_create(filt);
336 int avfilter_init_filter(AVFilterContext *filter, const char *args)
340 if(filter->filter->init)
341 if((ret = filter->filter->init(filter, args))) return ret;
345 int *avfilter_make_format_list(int len, ...)
350 ret = av_malloc(sizeof(int) * (len + 1));
352 for(i = 0; i < len; i ++)
353 ret[i] = va_arg(vl, int);