2 * Filter layer - default implementations
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
24 /* TODO: buffer pool. see comment for avfilter_default_get_video_buffer() */
25 void avfilter_default_free_video_buffer(AVFilterPic *pic)
27 avpicture_free((AVPicture *) pic);
31 /* TODO: set the buffer's priv member to a context structure for the whole
32 * filter chain. This will allow for a buffer pool instead of the constant
33 * alloc & free cycle currently implemented. */
34 AVFilterPicRef *avfilter_default_get_video_buffer(AVFilterLink *link, int perms)
36 AVFilterPic *pic = av_mallocz(sizeof(AVFilterPic));
37 AVFilterPicRef *ref = av_mallocz(sizeof(AVFilterPicRef));
45 pic->format = link->format;
46 pic->free = avfilter_default_free_video_buffer;
47 avpicture_alloc((AVPicture *)pic, pic->format, ref->w, ref->h);
49 memcpy(ref->data, pic->data, sizeof(pic->data));
50 memcpy(ref->linesize, pic->linesize, sizeof(pic->linesize));
55 void avfilter_default_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
57 AVFilterLink *out = NULL;
59 if(link->dst->output_count)
60 out = link->dst->outputs[0];
63 out->outpic = avfilter_get_video_buffer(out, AV_PERM_WRITE);
64 out->outpic->pts = picref->pts;
65 avfilter_start_frame(out, avfilter_ref_pic(out->outpic, ~0));
69 void avfilter_default_end_frame(AVFilterLink *link)
71 AVFilterLink *out = NULL;
73 if(link->dst->output_count)
74 out = link->dst->outputs[0];
76 avfilter_unref_pic(link->cur_pic);
81 avfilter_unref_pic(out->outpic);
84 avfilter_end_frame(out);
89 * default config_link() implementation for output video links to simplify
90 * the implementation of one input one output video filters */
91 int avfilter_default_config_output_link(AVFilterLink *link)
93 if(link->src->input_count && link->src->inputs[0]) {
94 link->w = link->src->inputs[0]->w;
95 link->h = link->src->inputs[0]->h;
97 /* XXX: any non-simple filter which would cause this branch to be taken
98 * really should implement its own config_props() for this link. */
107 * default config_link() implementation for input video links to simplify
108 * the implementation of one input one output video filters */
109 int avfilter_default_config_input_link(AVFilterLink *link)
111 if(!link->dst->output_count)
113 return avfilter_config_link(link->dst->outputs[0]);
117 * default query_formats() implementation for output video links to simplify
118 * the implementation of one input one output video filters */
119 int *avfilter_default_query_output_formats(AVFilterLink *link)
121 if(link->src->input_count && link->src->inputs[0])
122 return avfilter_make_format_list(1, link->src->inputs[0]->format);
124 /* XXX: any non-simple filter which would cause this branch to be taken
125 * really should implement its own query_formats() for this link */
126 return avfilter_make_format_list(0);