Commit bc37ec92 authored by Stefano Sabatini's avatar Stefano Sabatini
Browse files

Add slicify video filter.

Originally committed as revision 20445 to svn://svn.ffmpeg.org/ffmpeg/trunk
parent da23d424
......@@ -149,6 +149,21 @@ input to the vflip filter.
Pass the source unchanged to the output.
@section slicify
Pass the images of input video on to next video filter as multiple
slices.
@example
./ffmpeg -i in.avi -vfilters "slicify=32" out.avi
@end example
The filter accepts the slice height as parameter. If the parameter is
not specified it will use the default value of 16.
Adding this in the beginning of filter chains should make filtering
faster due to better use of the memory cache.
@section vflip
Flip the input video vertically.
......
......@@ -15,6 +15,7 @@ OBJS-$(CONFIG_CROP_FILTER) += vf_crop.o
OBJS-$(CONFIG_FORMAT_FILTER) += vf_format.o
OBJS-$(CONFIG_NOFORMAT_FILTER) += vf_format.o
OBJS-$(CONFIG_NULL_FILTER) += vf_null.o
OBJS-$(CONFIG_SLICIFY_FILTER) += vf_slicify.o
OBJS-$(CONFIG_VFLIP_FILTER) += vf_vflip.o
include $(SUBDIR)../subdir.mak
......@@ -38,5 +38,6 @@ void avfilter_register_all(void)
REGISTER_FILTER (FORMAT,format,vf);
REGISTER_FILTER (NOFORMAT,noformat,vf);
REGISTER_FILTER (NULL,null,vf);
REGISTER_FILTER (SLICIFY,slicify,vf);
REGISTER_FILTER (VFLIP,vflip,vf);
}
......@@ -23,8 +23,8 @@
#define AVFILTER_AVFILTER_H
#define LIBAVFILTER_VERSION_MAJOR 1
#define LIBAVFILTER_VERSION_MINOR 6
#define LIBAVFILTER_VERSION_MICRO 1
#define LIBAVFILTER_VERSION_MINOR 7
#define LIBAVFILTER_VERSION_MICRO 0
#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
LIBAVFILTER_VERSION_MINOR, \
......
/*
* 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
*/
/**
* @file libavfilter/vf_slicify.c
* video slicing filter
*/
#include "avfilter.h"
typedef struct {
int h; ///< output slice height
int vshift; ///< vertical chroma subsampling shift
} SliceContext;
static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
{
SliceContext *slice = ctx->priv;
slice->h = 16;
if (args)
sscanf(args, "%d", &slice->h);
return 0;
}
static int config_props(AVFilterLink *link)
{
SliceContext *slice = link->dst->priv;
int tmp;
avcodec_get_chroma_sub_sample(link->format, &tmp, &slice->vshift);
/* ensure that slices play nice with chroma subsampling, and enforce
* a reasonable minimum size for the slices */
slice->h = FFMAX(8, slice->h & (-1 << slice->vshift));
av_log(link->dst, AV_LOG_INFO, "h:%d\n", slice->h);
return 0;
}
static AVFilterPicRef *get_video_buffer(AVFilterLink *link, int perms,
int w, int h)
{
return avfilter_get_video_buffer(link->dst->outputs[0], perms, w, h);
}
static void start_frame(AVFilterLink *link, AVFilterPicRef *picref)
{
avfilter_start_frame(link->dst->outputs[0], picref);
}
static void end_frame(AVFilterLink *link)
{
avfilter_end_frame(link->dst->outputs[0]);
}
static void draw_slice(AVFilterLink *link, int y, int h)
{
SliceContext *slice = link->dst->priv;
int y2;
for (y2 = y; y2 + slice->h <= y + h; y2 += slice->h)
avfilter_draw_slice(link->dst->outputs[0], y2, slice->h);
if (y2 < y + h)
avfilter_draw_slice(link->dst->outputs[0], y2, y + h - y2);
}
AVFilter avfilter_vf_slicify = {
.name = "slicify",
.description = "Pass the images of input video on to next video filter as multiple slices.",
.init = init,
.priv_size = sizeof(SliceContext),
.inputs = (AVFilterPad[]) {{ .name = "default",
.type = CODEC_TYPE_VIDEO,
.get_video_buffer = get_video_buffer,
.start_frame = start_frame,
.draw_slice = draw_slice,
.config_props = config_props,
.end_frame = end_frame, },
{ .name = NULL}},
.outputs = (AVFilterPad[]) {{ .name = "default",
.type = CODEC_TYPE_VIDEO, },
{ .name = NULL}},
};
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