146 lines
4.9 KiB
C
146 lines
4.9 KiB
C
/*
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* Copyright (c) 2010 Bobby Bingham
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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 filters
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*/
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#include "libavutil/mathematics.h"
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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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char c = 0;
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if (args) {
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if (sscanf(args, "%d:%d%c", &aspect->aspect.num, &aspect->aspect.den, &c) != 2)
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if (sscanf(args, "%lf%c", &ratio, &c) == 1)
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aspect->aspect = av_d2q(ratio, 100);
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if (c || aspect->aspect.num <= 0 || aspect->aspect.den <= 0) {
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av_log(ctx, AV_LOG_ERROR,
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"Invalid string '%s' for aspect ratio.\n", args);
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return AVERROR(EINVAL);
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}
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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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if (aspect->aspect.den == 0)
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aspect->aspect = (AVRational) {0, 1};
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av_log(ctx, AV_LOG_INFO, "a:%d/%d\n", aspect->aspect.num, aspect->aspect.den);
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return 0;
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}
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static void start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
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{
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AspectContext *aspect = link->dst->priv;
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picref->video->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_SETDAR_FILTER
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/* for setdar filter, convert from frame aspect ratio to pixel aspect ratio */
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static int setdar_config_props(AVFilterLink *inlink)
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{
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AspectContext *aspect = inlink->dst->priv;
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AVRational dar = aspect->aspect;
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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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av_log(inlink->dst, AV_LOG_INFO, "w:%d h:%d -> dar:%d/%d sar:%d/%d\n",
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inlink->w, inlink->h, dar.num, dar.den, aspect->aspect.num, aspect->aspect.den);
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inlink->sample_aspect_ratio = aspect->aspect;
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return 0;
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}
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AVFilter avfilter_vf_setdar = {
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.name = "setdar",
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.description = NULL_IF_CONFIG_SMALL("Set the frame display 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 = setdar_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_SETDAR_FILTER */
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#if CONFIG_SETSAR_FILTER
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/* for setdar filter, convert from frame aspect ratio to pixel aspect ratio */
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static int setsar_config_props(AVFilterLink *inlink)
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{
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AspectContext *aspect = inlink->dst->priv;
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inlink->sample_aspect_ratio = aspect->aspect;
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return 0;
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}
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AVFilter avfilter_vf_setsar = {
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.name = "setsar",
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.description = NULL_IF_CONFIG_SMALL("Set the pixel sample 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 = setsar_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_SETSAR_FILTER */
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