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https://github.com/FFmpeg/FFmpeg.git
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a5e8c41c28
It is not used in any filters currently and is inherently evil. If passing binary data to filters is required in the future, it should be done with some AVOptions-based system.
148 lines
4.9 KiB
C
148 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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#include "internal.h"
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#include "video.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)
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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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ff_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 = ff_null_get_video_buffer,
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.start_frame = start_frame,
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.end_frame = ff_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 = ff_null_get_video_buffer,
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.start_frame = start_frame,
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.end_frame = ff_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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