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Add video filter to manipulate aspect ratio

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Originally committed as revision 22573 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Bobby Bingham 2010-03-17 03:43:14 +00:00
parent 68f0bc7e62
commit 3922deb577
3 changed files with 140 additions and 1 deletions
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2
libavfilter/Makefile
View File

@ -14,10 +14,12 @@ OBJS = allfilters.o \
graphparser.o \
parseutils.o \
OBJS-$(CONFIG_ASPECT_FILTER) += vf_aspect.o
OBJS-$(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_PIXELASPECT_FILTER) += vf_aspect.o
OBJS-$(CONFIG_SCALE_FILTER) += vf_scale.o
OBJS-$(CONFIG_SLICIFY_FILTER) += vf_slicify.o
OBJS-$(CONFIG_VFLIP_FILTER) += vf_vflip.o

4
libavfilter/allfilters.c
View File

@ -34,15 +34,17 @@ void avfilter_register_all(void)
return;
initialized = 1;
REGISTER_FILTER (ASPECT, aspect, vf);
REGISTER_FILTER (CROP, crop, vf);
REGISTER_FILTER (FORMAT, format, vf);
REGISTER_FILTER (NOFORMAT, noformat, vf);
REGISTER_FILTER (NULL, null, vf);
REGISTER_FILTER (PIXELASPECT, pixelaspect, vf);
REGISTER_FILTER (SCALE, scale, vf);
REGISTER_FILTER (SLICIFY, slicify, vf);
REGISTER_FILTER (VFLIP, vflip, vf);
REGISTER_FILTER (NULLSRC, nullsrc, vsrc);
REGISTER_FILTER(NULLSINK, nullsink, vsink);
REGISTER_FILTER (NULLSINK, nullsink, vsink);
}

135
libavfilter/vf_aspect.c Normal file
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@ -0,0 +1,135 @@
/*
* Aspect ratio modification video filter
* Copyright (c) 2010 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_aspect.c
* aspect ratio modification video filter
*/
#include "avfilter.h"
typedef struct {
AVRational aspect;
} AspectContext;
static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
{
AspectContext *aspect = ctx->priv;
double ratio;
int64_t gcd;
if(args) {
if(sscanf(args, "%d:%d", &aspect->aspect.num, &aspect->aspect.den) < 2) {
if(sscanf(args, "%lf", &ratio) < 1)
return -1;
aspect->aspect = av_d2q(ratio, 100);
} else {
gcd = av_gcd(FFABS(aspect->aspect.num), FFABS(aspect->aspect.den));
if(gcd) {
aspect->aspect.num /= gcd;
aspect->aspect.den /= gcd;
}
}
}
if(aspect->aspect.den == 0)
aspect->aspect = (AVRational) {0, 1};
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)
{
AspectContext *aspect = link->dst->priv;
picref->pixel_aspect = aspect->aspect;
avfilter_start_frame(link->dst->outputs[0], picref);
}
static void end_frame(AVFilterLink *link)
{
avfilter_end_frame(link->dst->outputs[0]);
}
#if CONFIG_ASPECT_FILTER
/* for aspect filter, convert from frame aspect ratio to pixel aspect ratio */
static int frameaspect_config_props(AVFilterLink *inlink)
{
AspectContext *aspect = inlink->dst->priv;
av_reduce(&aspect->aspect.num, &aspect->aspect.den,
aspect->aspect.num * inlink->h,
aspect->aspect.den * inlink->w, 100);
return 0;
}
AVFilter avfilter_vf_aspect = {
.name = "aspect",
.description = NULL_IF_CONFIG_SMALL("Set the frame aspect ratio."),
.init = init,
.priv_size = sizeof(AspectContext),
.inputs = (AVFilterPad[]) {{ .name = "default",
.type = CODEC_TYPE_VIDEO,
.config_props = frameaspect_config_props,
.get_video_buffer = get_video_buffer,
.start_frame = start_frame,
.end_frame = end_frame },
{ .name = NULL}},
.outputs = (AVFilterPad[]) {{ .name = "default",
.type = CODEC_TYPE_VIDEO, },
{ .name = NULL}},
};
#endif /* CONFIG_ASPECT_FILTER */
#if CONFIG_PIXELASPECT_FILTER
AVFilter avfilter_vf_pixelaspect = {
.name = "pixelaspect",
.description = NULL_IF_CONFIG_SMALL("Set the pixel aspect ratio."),
.init = init,
.priv_size = sizeof(AspectContext),
.inputs = (AVFilterPad[]) {{ .name = "default",
.type = CODEC_TYPE_VIDEO,
.get_video_buffer = get_video_buffer,
.start_frame = start_frame,
.end_frame = end_frame },
{ .name = NULL}},
.outputs = (AVFilterPad[]) {{ .name = "default",
.type = CODEC_TYPE_VIDEO, },
{ .name = NULL}},
};
#endif /* CONFIG_PIXELASPECT_FILTER */