ba87f0801d
Passing an explicit filename to this command is only necessary if the documentation in the @file block refers to a file different from the one the block resides in. Originally committed as revision 22921 to svn://svn.ffmpeg.org/ffmpeg/trunk
124 lines
4.1 KiB
C
124 lines
4.1 KiB
C
/*
|
|
* 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
|
|
* 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 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);
|
|
}
|
|
|
|
#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 = AVMEDIA_TYPE_VIDEO,
|
|
.config_props = frameaspect_config_props,
|
|
.get_video_buffer = avfilter_null_get_video_buffer,
|
|
.start_frame = start_frame,
|
|
.end_frame = avfilter_null_end_frame },
|
|
{ .name = NULL}},
|
|
|
|
.outputs = (AVFilterPad[]) {{ .name = "default",
|
|
.type = AVMEDIA_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 = AVMEDIA_TYPE_VIDEO,
|
|
.get_video_buffer = avfilter_null_get_video_buffer,
|
|
.start_frame = start_frame,
|
|
.end_frame = avfilter_null_end_frame },
|
|
{ .name = NULL}},
|
|
|
|
.outputs = (AVFilterPad[]) {{ .name = "default",
|
|
.type = AVMEDIA_TYPE_VIDEO, },
|
|
{ .name = NULL}},
|
|
};
|
|
#endif /* CONFIG_PIXELASPECT_FILTER */
|
|
|