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Move default entry point implementations to their own file.

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Make them externally visible because they may be useful for filters to use.

Commited in SoC by Bobby Bingham on 2007-08-02 15:14:05

Originally committed as revision 12063 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Vitor Sessak 2008-02-15 21:58:25 +00:00
parent 19d5da500f
commit bf4ce7a364
1 changed files with 118 additions and 0 deletions
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118
libavfilter/defaults.c Normal file
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/*
* Filter layer - default implementations
* copyright (c) 2007 Bobby Bingham
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "avfilter.h"
/* TODO: buffer pool. see comment for avfilter_default_get_video_buffer() */
void avfilter_default_free_video_buffer(AVFilterPic *pic)
{
avpicture_free((AVPicture *) pic);
av_free(pic);
}
/* TODO: set the buffer's priv member to a context structure for the whole
* filter chain. This will allow for a buffer pool instead of the constant
* alloc & free cycle currently implemented. */
AVFilterPicRef *avfilter_default_get_video_buffer(AVFilterLink *link, int perms)
{
AVFilterPic *pic = av_mallocz(sizeof(AVFilterPic));
AVFilterPicRef *ref = av_mallocz(sizeof(AVFilterPicRef));
ref->pic = pic;
ref->w = link->w;
ref->h = link->h;
ref->perms = perms;
pic->refcount = 1;
pic->format = link->format;
pic->free = avfilter_default_free_video_buffer;
avpicture_alloc((AVPicture *)pic, pic->format, ref->w, ref->h);
memcpy(ref->data, pic->data, sizeof(pic->data));
memcpy(ref->linesize, pic->linesize, sizeof(pic->linesize));
return ref;
}
void avfilter_default_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
{
AVFilterLink *out = NULL;
if(link->dst->output_count)
out = link->dst->outputs[0];
link->cur_pic = picref;
if(out) {
out->outpic = avfilter_get_video_buffer(out, AV_PERM_WRITE);
out->outpic->pts = picref->pts;
avfilter_start_frame(out, avfilter_ref_pic(out->outpic, ~0));
}
}
void avfilter_default_end_frame(AVFilterLink *link)
{
AVFilterLink *out = NULL;
if(link->dst->output_count)
out = link->dst->outputs[0];
avfilter_unref_pic(link->cur_pic);
link->cur_pic = NULL;
if(out) {
avfilter_unref_pic(out->outpic);
out->outpic = NULL;
avfilter_end_frame(out);
}
}
/**
* default config_link() implementation for output video links to simplify
* the implementation of one input one output video filters */
int avfilter_default_config_output_link(AVFilterLink *link)
{
if(link->src->input_count && link->src->inputs[0]) {
link->w = link->src->inputs[0]->w;
link->h = link->src->inputs[0]->h;
} else {
/* XXX: any non-simple filter which would cause this branch to be taken
* really should implement its own config_props() for this link. */
link->w =
link->h = 0;
}
return 0;
}
/**
* default query_formats() implementation for output video links to simplify
* the implementation of one input one output video filters */
int *avfilter_default_query_output_formats(AVFilterLink *link)
{
if(link->src->input_count && link->src->inputs[0])
return avfilter_make_format_list(1, link->src->inputs[0]->format);
else
/* XXX: any non-simple filter which would cause this branch to be taken
* really should implement its own query_formats() for this link */
return avfilter_make_format_list(0);
}