vf_aspect.c 5.73 KB
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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
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
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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
 * 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
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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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 * @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/mathematics.h"
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#include "libavutil/opt.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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    const AVClass *class;
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    AVRational dar;
    AVRational sar;
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#if FF_API_OLD_FILTER_OPTS
    float aspect_num, aspect_den;
#endif
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} AspectContext;

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#if FF_API_OLD_FILTER_OPTS
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static av_cold int init(AVFilterContext *ctx)
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{
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    AspectContext *s = ctx->priv;
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    if (s->aspect_num > 0 && s->aspect_den > 0) {
        av_log(ctx, AV_LOG_WARNING, "This syntax is deprecated, use "
               "dar=<number> or dar=num/den.\n");
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        s->sar = s->dar = av_d2q(s->aspect_num / s->aspect_den, INT_MAX);
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    }
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    return 0;
}
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#endif
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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)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM

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#if CONFIG_SETDAR_FILTER
/* for setdar filter, convert from frame aspect ratio to pixel aspect ratio */
static int setdar_config_props(AVFilterLink *inlink)
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{
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    AspectContext *s = inlink->dst->priv;
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    AVRational dar;

    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, 100);
        inlink->sample_aspect_ratio = s->sar;
        dar = s->dar;
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    } else {
        inlink->sample_aspect_ratio = (AVRational){ 1, 1 };
        dar = (AVRational){ inlink->w, inlink->h };
    }
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    av_log(inlink->dst, AV_LOG_VERBOSE, "w:%d h:%d -> dar:%d/%d sar:%d/%d\n",
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           inlink->w, inlink->h, dar.num, dar.den,
           inlink->sample_aspect_ratio.num, inlink->sample_aspect_ratio.den);
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    return 0;
}

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static const AVOption setdar_options[] = {
#if FF_API_OLD_FILTER_OPTS
    { "dar_num", NULL, OFFSET(aspect_num), AV_OPT_TYPE_FLOAT, { .dbl = 0 }, 0, FLT_MAX, FLAGS },
    { "dar_den", NULL, OFFSET(aspect_den), AV_OPT_TYPE_FLOAT, { .dbl = 0 }, 0, FLT_MAX, FLAGS },
#endif
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    { "dar", "display aspect ratio", OFFSET(dar), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, INT_MAX, FLAGS },
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    { NULL },
};

static const AVClass setdar_class = {
    .class_name = "setdar",
    .item_name  = av_default_item_name,
    .option     = setdar_options,
    .version    = LIBAVUTIL_VERSION_INT,
};

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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,
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        .filter_frame     = filter_frame,
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    },
    { NULL }
};

static const AVFilterPad avfilter_vf_setdar_outputs[] = {
    {
        .name = "default",
        .type = AVMEDIA_TYPE_VIDEO,
    },
    { NULL }
};

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AVFilter avfilter_vf_setdar = {
    .name      = "setdar",
    .description = NULL_IF_CONFIG_SMALL("Set the frame display aspect ratio."),
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#if FF_API_OLD_FILTER_OPTS
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    .init      = init,
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#endif
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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,

    .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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/* for setdar filter, convert from frame aspect ratio to pixel aspect ratio */
static int setsar_config_props(AVFilterLink *inlink)
{
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    AspectContext *s = inlink->dst->priv;
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    inlink->sample_aspect_ratio = s->sar;
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    return 0;
}

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static const AVOption setsar_options[] = {
#if FF_API_OLD_FILTER_OPTS
    { "sar_num", NULL, OFFSET(aspect_num), AV_OPT_TYPE_FLOAT, { .dbl = 0 }, 0, FLT_MAX, FLAGS },
    { "sar_den", NULL, OFFSET(aspect_den), AV_OPT_TYPE_FLOAT, { .dbl = 0 }, 0, FLT_MAX, FLAGS },
#endif
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    { "sar", "sample (pixel) aspect ratio", OFFSET(sar), AV_OPT_TYPE_RATIONAL, { .dbl = 1 }, 0, INT_MAX, FLAGS },
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    { NULL },
};

static const AVClass setsar_class = {
    .class_name = "setsar",
    .item_name  = av_default_item_name,
    .option     = setsar_options,
    .version    = LIBAVUTIL_VERSION_INT,
};

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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,
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        .filter_frame     = filter_frame,
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    },
    { NULL }
};

static const AVFilterPad avfilter_vf_setsar_outputs[] = {
    {
        .name = "default",
        .type = AVMEDIA_TYPE_VIDEO,
    },
    { NULL }
};

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AVFilter avfilter_vf_setsar = {
    .name      = "setsar",
    .description = NULL_IF_CONFIG_SMALL("Set the pixel sample aspect ratio."),
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#if FF_API_OLD_FILTER_OPTS
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    .init      = init,
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#endif
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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,

    .outputs   = avfilter_vf_setsar_outputs,
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};
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#endif /* CONFIG_SETSAR_FILTER */