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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
/*
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* Aspect ratio modification video filter
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* Copyright (c) 2010 Bobby Bingham
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* aspect ratio modification video filter
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*/
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#include "avfilter.h"
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typedef struct {
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AVRational aspect;
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} AspectContext;
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static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
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{
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AspectContext *aspect = ctx->priv;
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double ratio;
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int64_t gcd;
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if(args) {
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if(sscanf(args, "%d:%d", &aspect->aspect.num, &aspect->aspect.den) < 2) {
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if(sscanf(args, "%lf", &ratio) < 1)
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return -1;
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aspect->aspect = av_d2q(ratio, 100);
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} else {
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gcd = av_gcd(FFABS(aspect->aspect.num), FFABS(aspect->aspect.den));
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if(gcd) {
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aspect->aspect.num /= gcd;
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aspect->aspect.den /= gcd;
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}
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}
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}
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if(aspect->aspect.den == 0)
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aspect->aspect = (AVRational) {0, 1};
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return 0;
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}
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static void start_frame(AVFilterLink *link, AVFilterPicRef *picref)
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{
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AspectContext *aspect = link->dst->priv;
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picref->pixel_aspect = aspect->aspect;
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avfilter_start_frame(link->dst->outputs[0], picref);
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}
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#if CONFIG_ASPECT_FILTER
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/* for aspect filter, convert from frame aspect ratio to pixel aspect ratio */
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static int frameaspect_config_props(AVFilterLink *inlink)
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{
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AspectContext *aspect = inlink->dst->priv;
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av_reduce(&aspect->aspect.num, &aspect->aspect.den,
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aspect->aspect.num * inlink->h,
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aspect->aspect.den * inlink->w, 100);
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return 0;
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}
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AVFilter avfilter_vf_aspect = {
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.name = "aspect",
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.description = NULL_IF_CONFIG_SMALL("Set the frame aspect ratio."),
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.init = init,
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.priv_size = sizeof(AspectContext),
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.inputs = (AVFilterPad[]) {{ .name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.config_props = frameaspect_config_props,
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.get_video_buffer = avfilter_null_get_video_buffer,
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.start_frame = start_frame,
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.end_frame = avfilter_null_end_frame },
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{ .name = NULL}},
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.outputs = (AVFilterPad[]) {{ .name = "default",
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.type = AVMEDIA_TYPE_VIDEO, },
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{ .name = NULL}},
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};
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#endif /* CONFIG_ASPECT_FILTER */
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#if CONFIG_PIXELASPECT_FILTER
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AVFilter avfilter_vf_pixelaspect = {
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.name = "pixelaspect",
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.description = NULL_IF_CONFIG_SMALL("Set the pixel aspect ratio."),
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.init = init,
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.priv_size = sizeof(AspectContext),
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.inputs = (AVFilterPad[]) {{ .name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.get_video_buffer = avfilter_null_get_video_buffer,
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.start_frame = start_frame,
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.end_frame = avfilter_null_end_frame },
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{ .name = NULL}},
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.outputs = (AVFilterPad[]) {{ .name = "default",
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.type = AVMEDIA_TYPE_VIDEO, },
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{ .name = NULL}},
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};
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#endif /* CONFIG_PIXELASPECT_FILTER */
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