GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavfilter/vf_aspect.c Lines: 53 62 85.5 %
Date: 2020-10-23 17:01:47 Branches: 13 22 59.1 %

Line Branch Exec Source
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/*
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 * Copyright (c) 2010 Bobby Bingham
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 *
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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 filters
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 */
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#include <float.h>
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#include "libavutil/common.h"
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#include "libavutil/eval.h"
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#include "libavutil/mathematics.h"
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#include "libavutil/opt.h"
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#include "libavutil/parseutils.h"
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#include "libavutil/pixdesc.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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static const char *const var_names[] = {
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    "w",
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    "h",
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    "a", "dar",
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    "sar",
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    "hsub",
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    "vsub",
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    NULL
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};
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enum var_name {
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    VAR_W,
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    VAR_H,
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    VAR_A, VAR_DAR,
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    VAR_SAR,
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    VAR_HSUB,
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    VAR_VSUB,
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    VARS_NB
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};
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typedef struct AspectContext {
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    const AVClass *class;
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    AVRational dar;
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    AVRational sar;
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    int max;
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    char *ratio_expr;
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} AspectContext;
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static int filter_frame(AVFilterLink *link, AVFrame *frame)
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{
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    AspectContext *s = link->dst->priv;
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    frame->sample_aspect_ratio = s->sar;
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    return ff_filter_frame(link->dst->outputs[0], frame);
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}
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#define OFFSET(x) offsetof(AspectContext, x)
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
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static inline void compute_dar(AVRational *dar, AVRational sar, int w, int h)
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{
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    if (sar.num && sar.den) {
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        av_reduce(&dar->num, &dar->den, sar.num * (int64_t)w, sar.den * (int64_t)h, INT_MAX);
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    } else {
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        av_reduce(&dar->num, &dar->den, w, h, INT_MAX);
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    }
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}
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static int get_aspect_ratio(AVFilterLink *inlink, AVRational *aspect_ratio)
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{
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    AVFilterContext *ctx = inlink->dst;
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    AspectContext *s = inlink->dst->priv;
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    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
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    double var_values[VARS_NB], res;
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    int ret;
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    var_values[VAR_W]     = inlink->w;
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    var_values[VAR_H]     = inlink->h;
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    var_values[VAR_A]     = (double) inlink->w / inlink->h;
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    var_values[VAR_SAR]   = inlink->sample_aspect_ratio.num ?
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        (double) inlink->sample_aspect_ratio.num / inlink->sample_aspect_ratio.den : 1;
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    var_values[VAR_DAR]   = var_values[VAR_A] * var_values[VAR_SAR];
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    var_values[VAR_HSUB]  = 1 << desc->log2_chroma_w;
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    var_values[VAR_VSUB]  = 1 << desc->log2_chroma_h;
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    /* evaluate new aspect ratio*/
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    ret = av_expr_parse_and_eval(&res, s->ratio_expr,
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                                      var_names, var_values,
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                                      NULL, NULL, NULL, NULL, NULL, 0, ctx);
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    if (ret < 0) {
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        ret = av_parse_ratio(aspect_ratio, s->ratio_expr, s->max, 0, ctx);
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    } else
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        *aspect_ratio = av_d2q(res, s->max);
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    if (ret < 0) {
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        av_log(ctx, AV_LOG_ERROR,
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               "Error when evaluating the expression '%s'\n", s->ratio_expr);
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        return ret;
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    }
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    if (aspect_ratio->num < 0 || aspect_ratio->den <= 0) {
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        av_log(ctx, AV_LOG_ERROR,
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                "Invalid string '%s' for aspect ratio\n", s->ratio_expr);
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        return AVERROR(EINVAL);
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    }
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    return 0;
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}
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#if CONFIG_SETDAR_FILTER
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static int setdar_config_props(AVFilterLink *outlink)
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{
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    AVFilterContext *ctx = outlink->src;
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    AVFilterLink *inlink = ctx->inputs[0];
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    AspectContext *s = ctx->priv;
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    AVRational dar;
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    AVRational old_dar;
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    AVRational old_sar = inlink->sample_aspect_ratio;
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    int ret;
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    if ((ret = get_aspect_ratio(inlink, &s->dar)))
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        return ret;
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    if (s->dar.num && s->dar.den) {
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        av_reduce(&s->sar.num, &s->sar.den,
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                   s->dar.num * inlink->h,
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                   s->dar.den * inlink->w, INT_MAX);
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        outlink->sample_aspect_ratio = s->sar;
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        dar = s->dar;
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    } else {
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        outlink->sample_aspect_ratio = (AVRational){ 1, 1 };
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        dar = (AVRational){ inlink->w, inlink->h };
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    }
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    compute_dar(&old_dar, old_sar, inlink->w, inlink->h);
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    av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d dar:%d/%d sar:%d/%d -> dar:%d/%d sar:%d/%d\n",
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           inlink->w, inlink->h, old_dar.num, old_dar.den, old_sar.num, old_sar.den,
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           dar.num, dar.den, outlink->sample_aspect_ratio.num, outlink->sample_aspect_ratio.den);
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    return 0;
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}
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static const AVOption setdar_options[] = {
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    { "dar",   "set display aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
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    { "ratio", "set display aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
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    { "r",     "set display aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
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    { "max",   "set max value for nominator or denominator in the ratio", OFFSET(max), AV_OPT_TYPE_INT, {.i64=100}, 1, INT_MAX, FLAGS },
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    { NULL }
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};
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AVFILTER_DEFINE_CLASS(setdar);
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static const AVFilterPad avfilter_vf_setdar_inputs[] = {
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    {
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        .name         = "default",
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        .type         = AVMEDIA_TYPE_VIDEO,
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        .filter_frame = filter_frame,
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    },
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    { NULL }
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};
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static const AVFilterPad avfilter_vf_setdar_outputs[] = {
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    {
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        .name = "default",
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        .type = AVMEDIA_TYPE_VIDEO,
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        .config_props = setdar_config_props,
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    },
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    { NULL }
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};
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AVFilter ff_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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    .priv_size   = sizeof(AspectContext),
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    .priv_class  = &setdar_class,
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    .inputs      = avfilter_vf_setdar_inputs,
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    .outputs     = avfilter_vf_setdar_outputs,
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};
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#endif /* CONFIG_SETDAR_FILTER */
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#if CONFIG_SETSAR_FILTER
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static int setsar_config_props(AVFilterLink *outlink)
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{
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    AVFilterContext *ctx = outlink->src;
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    AVFilterLink *inlink = ctx->inputs[0];
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    AspectContext *s = ctx->priv;
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    AVRational old_sar = inlink->sample_aspect_ratio;
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    AVRational old_dar, dar;
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    int ret;
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    if ((ret = get_aspect_ratio(inlink, &s->sar)))
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        return ret;
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    outlink->sample_aspect_ratio = s->sar;
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    compute_dar(&old_dar, old_sar, inlink->w, inlink->h);
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    compute_dar(&dar, s->sar, inlink->w, inlink->h);
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    av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d sar:%d/%d dar:%d/%d -> sar:%d/%d dar:%d/%d\n",
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           inlink->w, inlink->h, old_sar.num, old_sar.den, old_dar.num, old_dar.den,
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           outlink->sample_aspect_ratio.num, outlink->sample_aspect_ratio.den, dar.num, dar.den);
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    return 0;
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}
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static const AVOption setsar_options[] = {
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    { "sar",   "set sample (pixel) aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
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    { "ratio", "set sample (pixel) aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
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    { "r",     "set sample (pixel) aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
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    { "max",   "set max value for nominator or denominator in the ratio", OFFSET(max), AV_OPT_TYPE_INT, {.i64=100}, 1, INT_MAX, FLAGS },
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    { NULL }
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};
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AVFILTER_DEFINE_CLASS(setsar);
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static const AVFilterPad avfilter_vf_setsar_inputs[] = {
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    {
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        .name         = "default",
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        .type         = AVMEDIA_TYPE_VIDEO,
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        .filter_frame = filter_frame,
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    },
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    { NULL }
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};
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static const AVFilterPad avfilter_vf_setsar_outputs[] = {
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    {
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        .name = "default",
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        .type = AVMEDIA_TYPE_VIDEO,
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        .config_props = setsar_config_props,
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    },
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    { NULL }
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};
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AVFilter ff_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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    .priv_size   = sizeof(AspectContext),
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    .priv_class  = &setsar_class,
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    .inputs      = avfilter_vf_setsar_inputs,
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    .outputs     = avfilter_vf_setsar_outputs,
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};
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#endif /* CONFIG_SETSAR_FILTER */