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Create a set of null callback functions.

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These are useful for filters which don't modify the image data.

Originally committed as revision 22594 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Bobby Bingham 2010-03-18 23:12:48 +00:00
parent 22e8222fd2
commit 91d1c741bf
2 changed files with 33 additions and 0 deletions
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13
libavfilter/avfilter.h
View File

@ -395,6 +395,19 @@ void avfilter_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)
/** Default handler for query_formats() */
int avfilter_default_query_formats(AVFilterContext *ctx);
/** start_frame() handler for filters which simply pass video along */
void avfilter_null_start_frame(AVFilterLink *link, AVFilterPicRef *picref);
/** draw_slice() handler for filters which simply pass video along */
void avfilter_null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir);
/** end_frame() handler for filters which simply pass video along */
void avfilter_null_end_frame(AVFilterLink *link);
/** get_video_buffer() handler for filters which simply pass video along */
AVFilterPicRef *avfilter_null_get_video_buffer(AVFilterLink *link,
int perms, int w, int h);
/**
* Filter definition. This defines the pads a filter contains, and all the
* callback functions used to interact with the filter.

20
libavfilter/defaults.c
View File

@ -165,3 +165,23 @@ int avfilter_default_query_formats(AVFilterContext *ctx)
return 0;
}
void avfilter_null_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
{
avfilter_start_frame(link->dst->outputs[0], picref);
}
void avfilter_null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
{
avfilter_draw_slice(link->dst->outputs[0], y, h, slice_dir);
}
void avfilter_null_end_frame(AVFilterLink *link)
{
avfilter_end_frame(link->dst->outputs[0]);
}
AVFilterPicRef *avfilter_null_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
{
return avfilter_get_video_buffer(link->dst->outputs[0], perms, w, h);
}