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/*
* 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 filters
*/
#include "libavutil/common.h"
#include "libavutil/opt.h"
#include "libavutil/mathematics.h"
#include "libavutil/parseutils.h"
#include "avfilter.h"
#include "internal.h"
#include "video.h"
typedef struct {
const AVClass *class;
AVRational ratio;
char *ratio_str;
int max;
} AspectContext;
#define OFFSET(x) offsetof(AspectContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
static const AVOption options[] = {
{"max", "set max value for nominator or denominator in the ratio", OFFSET(max), AV_OPT_TYPE_INT, {.i64=100}, 1, INT_MAX, FLAGS },
{"ratio", "set ratio", OFFSET(ratio_str), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, FLAGS },
{"r", "set ratio", OFFSET(ratio_str), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, FLAGS },
{NULL}
};
static av_cold int init(AVFilterContext *ctx, const char *args, const AVClass *class)
{
AspectContext *aspect = ctx->priv;
static const char *shorthand[] = { "ratio", "max", NULL };
char c;
int ret;
AVRational q;
aspect->class = class;
av_opt_set_defaults(aspect);
if (sscanf(args, "%d:%d%c", &q.num, &q.den, &c) == 2) {
aspect->ratio_str = av_strdup(args);
av_log(ctx, AV_LOG_WARNING,
"num:den syntax is deprecated, please use num/den or named options instead\n");
} else if ((ret = av_opt_set_from_string(aspect, args, shorthand, "=", ":")) < 0) {
return ret;
}
if (aspect->ratio_str) {
ret = av_parse_ratio(&aspect->ratio, aspect->ratio_str, aspect->max, 0, ctx);
if (ret < 0 || aspect->ratio.num < 0 || aspect->ratio.den <= 0) {
av_log(ctx, AV_LOG_ERROR,
"Invalid string '%s' for aspect ratio\n", args);
return AVERROR(EINVAL);
}
}
av_log(ctx, AV_LOG_VERBOSE, "a:%d/%d\n", aspect->ratio.num, aspect->ratio.den);
return 0;
}
static int filter_frame(AVFilterLink *link, AVFilterBufferRef *frame)
{
AspectContext *aspect = link->dst->priv;
frame->video->sample_aspect_ratio = aspect->ratio;
return ff_filter_frame(link->dst->outputs[0], frame);
}
static av_cold void uninit(AVFilterContext *ctx)
{
AspectContext *aspect = ctx->priv;
av_opt_free(aspect);
}
#if CONFIG_SETDAR_FILTER
#define setdar_options options
AVFILTER_DEFINE_CLASS(setdar);
static av_cold int setdar_init(AVFilterContext *ctx, const char *args)
{
return init(ctx, args, &setdar_class);
}
static int setdar_config_props(AVFilterLink *inlink)
{
AspectContext *aspect = inlink->dst->priv;
AVRational dar = aspect->ratio;
av_reduce(&aspect->ratio.num, &aspect->ratio.den,
aspect->ratio.num * inlink->h,
aspect->ratio.den * inlink->w, 100);
av_log(inlink->dst, AV_LOG_VERBOSE, "w:%d h:%d -> dar:%d/%d sar:%d/%d\n",
inlink->w, inlink->h, dar.num, dar.den, aspect->ratio.num, aspect->ratio.den);
inlink->sample_aspect_ratio = aspect->ratio;
return 0;
}
static const AVFilterPad avfilter_vf_setdar_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = setdar_config_props,
.get_video_buffer = ff_null_get_video_buffer,
.filter_frame = filter_frame,
},
{ NULL }
};
static const AVFilterPad avfilter_vf_setdar_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
{ NULL }
};
AVFilter avfilter_vf_setdar = {
.name = "setdar",
.description = NULL_IF_CONFIG_SMALL("Set the frame display aspect ratio."),
.init = setdar_init,
.uninit = uninit,
.priv_size = sizeof(AspectContext),
.inputs = avfilter_vf_setdar_inputs,
.outputs = avfilter_vf_setdar_outputs,
.priv_class = &setdar_class,
};
#endif /* CONFIG_SETDAR_FILTER */
#if CONFIG_SETSAR_FILTER
#define setsar_options options
AVFILTER_DEFINE_CLASS(setsar);
static av_cold int setsar_init(AVFilterContext *ctx, const char *args)
{
return init(ctx, args, &setsar_class);
}
static int setsar_config_props(AVFilterLink *inlink)
{
AspectContext *aspect = inlink->dst->priv;
inlink->sample_aspect_ratio = aspect->ratio;
return 0;
}
static const AVFilterPad avfilter_vf_setsar_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = setsar_config_props,
.get_video_buffer = ff_null_get_video_buffer,
.filter_frame = filter_frame,
},
{ NULL }
};
static const AVFilterPad avfilter_vf_setsar_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
{ NULL }
};
AVFilter avfilter_vf_setsar = {
.name = "setsar",
.description = NULL_IF_CONFIG_SMALL("Set the pixel sample aspect ratio."),
.init = setsar_init,
.uninit = uninit,
.priv_size = sizeof(AspectContext),
.inputs = avfilter_vf_setsar_inputs,
.outputs = avfilter_vf_setsar_outputs,
.priv_class = &setsar_class,
};
#endif /* CONFIG_SETSAR_FILTER */
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