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/*
* Copyright (c) 2002 Michael Niedermayer <michaelni@gmx.at>
*
* 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
* swap UV filter
*/

#include "libavutil/pixdesc.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"

static void do_swap(AVFrame *frame)
{
    FFSWAP(uint8_t*, frame->data[1], frame->data[2]);
    FFSWAP(int, frame->linesize[1], frame->linesize[2]);
    FFSWAP(uint64_t, frame->error[1], frame->error[2]);
    FFSWAP(AVBufferRef*, frame->buf[1], frame->buf[2]);
}

static AVFrame *get_video_buffer(AVFilterLink *link, int w, int h)
{
    AVFrame *picref = ff_default_get_video_buffer(link, w, h);
    do_swap(picref);
    return picref;
}

static int filter_frame(AVFilterLink *link, AVFrame *inpicref)
{
    do_swap(inpicref);
    return ff_filter_frame(link->dst->outputs[0], inpicref);
}

static int is_planar_yuv(const AVPixFmtDescriptor *desc)
{
    int i;

    if (desc->flags & ~(AV_PIX_FMT_FLAG_BE | AV_PIX_FMT_FLAG_PLANAR | AV_PIX_FMT_FLAG_ALPHA) ||
        desc->nb_components < 3 ||
        (desc->comp[1].depth_minus1 != desc->comp[2].depth_minus1))
        return 0;
    for (i = 0; i < desc->nb_components; i++) {
        if (desc->comp[i].offset_plus1 != 1 ||
            desc->comp[i].shift != 0 ||
            desc->comp[i].plane != i)
            return 0;
    }

    return 1;
}

static int query_formats(AVFilterContext *ctx)
{
    AVFilterFormats *formats = NULL;
    int fmt;

    for (fmt = 0; fmt < AV_PIX_FMT_NB; fmt++) {
        const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);
        if (is_planar_yuv(desc))
            ff_add_format(&formats, fmt);
    }

    ff_set_common_formats(ctx, formats);
    return 0;
}

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

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

AVFilter ff_vf_swapuv = {
    .name = "swapuv",
    .description = NULL_IF_CONFIG_SMALL("Swap U and V components."),
    .query_formats = query_formats,
    .inputs = swapuv_inputs,
    .outputs = swapuv_outputs,
};
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