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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 <float.h>
#include "libavutil/common.h"
#include "libavutil/eval.h"
#include "libavutil/mathematics.h"
#include "libavutil/opt.h"
#include "libavutil/parseutils.h"
#include "libavutil/pixdesc.h"
#include "avfilter.h"
#include "internal.h"
#include "video.h"
static const char *const var_names[] = {
"w",
"h",
"a", "dar",
"sar",
"hsub",
"vsub",
NULL
};
enum var_name {
VAR_W,
VAR_H,
VAR_A, VAR_DAR,
VAR_SAR,
VAR_HSUB,
VAR_VSUB,
VARS_NB
};
typedef struct AspectContext {
const AVClass *class;
AVRational dar;
AVRational sar;
int max;
char *ratio_expr;
} AspectContext;
static int filter_frame(AVFilterLink *link, AVFrame *frame)
{
AspectContext *s = link->dst->priv;
frame->sample_aspect_ratio = s->sar;
return ff_filter_frame(link->dst->outputs[0], frame);
}
#define OFFSET(x) offsetof(AspectContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
static inline void compute_dar(AVRational *dar, AVRational sar, int w, int h)
{
if (sar.num && sar.den) {
av_reduce(&dar->num, &dar->den, sar.num * w, sar.den * h, INT_MAX);
} else {
av_reduce(&dar->num, &dar->den, w, h, INT_MAX);
}
}
static int get_aspect_ratio(AVFilterLink *inlink, AVRational *aspect_ratio)
{
AVFilterContext *ctx = inlink->dst;
AspectContext *s = inlink->dst->priv;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
double var_values[VARS_NB], res;
int ret;
var_values[VAR_W] = inlink->w;
var_values[VAR_H] = inlink->h;
var_values[VAR_A] = (double) inlink->w / inlink->h;
var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ?
(double) inlink->sample_aspect_ratio.num / inlink->sample_aspect_ratio.den : 1;
var_values[VAR_DAR] = var_values[VAR_A] * var_values[VAR_SAR];
var_values[VAR_HSUB] = 1 << desc->log2_chroma_w;
var_values[VAR_VSUB] = 1 << desc->log2_chroma_h;
/* evaluate new aspect ratio*/
ret = av_expr_parse_and_eval(&res, s->ratio_expr,
var_names, var_values,
NULL, NULL, NULL, NULL, NULL, 0, ctx);
if (ret < 0) {
ret = av_parse_ratio(aspect_ratio, s->ratio_expr, s->max, 0, ctx);
} else
*aspect_ratio = av_d2q(res, s->max);
if (ret < 0) {
av_log(ctx, AV_LOG_ERROR,
"Error when evaluating the expression '%s'\n", s->ratio_expr);
return ret;
}
if (aspect_ratio->num < 0 || aspect_ratio->den <= 0) {
av_log(ctx, AV_LOG_ERROR,
"Invalid string '%s' for aspect ratio\n", s->ratio_expr);
return AVERROR(EINVAL);
}
return 0;
}
#if CONFIG_SETDAR_FILTER
static int setdar_config_props(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
AVFilterLink *inlink = ctx->inputs[0];
AspectContext *s = ctx->priv;
AVRational dar;
AVRational old_dar;
AVRational old_sar = inlink->sample_aspect_ratio;
int ret;
if ((ret = get_aspect_ratio(inlink, &s->dar)))
return ret;
if (s->dar.num && s->dar.den) {
av_reduce(&s->sar.num, &s->sar.den,
s->dar.num * inlink->h,
s->dar.den * inlink->w, INT_MAX);
outlink->sample_aspect_ratio = s->sar;
dar = s->dar;
} else {
outlink->sample_aspect_ratio = (AVRational){ 1, 1 };
dar = (AVRational){ inlink->w, inlink->h };
}
compute_dar(&old_dar, old_sar, inlink->w, inlink->h);
av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d dar:%d/%d sar:%d/%d -> dar:%d/%d sar:%d/%d\n",
inlink->w, inlink->h, old_dar.num, old_dar.den, old_sar.num, old_sar.den,
dar.num, dar.den, outlink->sample_aspect_ratio.num, outlink->sample_aspect_ratio.den);
return 0;
}
static const AVOption setdar_options[] = {
{ "dar", "set display aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
{ "ratio", "set display aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
{ "r", "set display aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
{ "max", "set max value for nominator or denominator in the ratio", OFFSET(max), AV_OPT_TYPE_INT, {.i64=100}, 1, INT_MAX, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(setdar);
static const AVFilterPad avfilter_vf_setdar_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
},
{ NULL }
};
static const AVFilterPad avfilter_vf_setdar_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = setdar_config_props,
},
{ NULL }
};
AVFilter ff_vf_setdar = {
.name = "setdar",
.description = NULL_IF_CONFIG_SMALL("Set the frame display aspect ratio."),
.priv_size = sizeof(AspectContext),
.priv_class = &setdar_class,
.inputs = avfilter_vf_setdar_inputs,
.outputs = avfilter_vf_setdar_outputs,
};
#endif /* CONFIG_SETDAR_FILTER */
#if CONFIG_SETSAR_FILTER
static int setsar_config_props(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
AVFilterLink *inlink = ctx->inputs[0];
AspectContext *s = ctx->priv;
AVRational old_sar = inlink->sample_aspect_ratio;
AVRational old_dar, dar;
int ret;
if ((ret = get_aspect_ratio(inlink, &s->sar)))
return ret;
outlink->sample_aspect_ratio = s->sar;
compute_dar(&old_dar, old_sar, inlink->w, inlink->h);
compute_dar(&dar, s->sar, inlink->w, inlink->h);
av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d sar:%d/%d dar:%d/%d -> sar:%d/%d dar:%d/%d\n",
inlink->w, inlink->h, old_sar.num, old_sar.den, old_dar.num, old_dar.den,
outlink->sample_aspect_ratio.num, outlink->sample_aspect_ratio.den, dar.num, dar.den);
return 0;
}
static const AVOption setsar_options[] = {
{ "sar", "set sample (pixel) aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
{ "ratio", "set sample (pixel) aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
{ "r", "set sample (pixel) aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
{ "max", "set max value for nominator or denominator in the ratio", OFFSET(max), AV_OPT_TYPE_INT, {.i64=100}, 1, INT_MAX, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(setsar);
static const AVFilterPad avfilter_vf_setsar_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
},
{ NULL }
};
static const AVFilterPad avfilter_vf_setsar_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = setsar_config_props,
},
{ NULL }
};
AVFilter ff_vf_setsar = {
.name = "setsar",
.description = NULL_IF_CONFIG_SMALL("Set the pixel sample aspect ratio."),
.priv_size = sizeof(AspectContext),
.priv_class = &setsar_class,
.inputs = avfilter_vf_setsar_inputs,
.outputs = avfilter_vf_setsar_outputs,
};
#endif /* CONFIG_SETSAR_FILTER */
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