/*
 * 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
 * Super resolution video filter with AMF hardware acceleration
 */

#include <stdio.h>
#include <string.h>

#include "libavutil/avassert.h"
#include "libavutil/imgutils.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "libavutil/time.h"

#include "libavutil/hwcontext.h"
#include "libavutil/hwcontext_amf.h"
#include "libavutil/hwcontext_amf_internal.h"

#include "AMF/components/HQScaler.h"
#include "AMF/components/ColorSpace.h"
#include "vf_amf_common.h"

#include "avfilter.h"
#include "avfilter_internal.h"
#include "formats.h"
#include "video.h"

#if CONFIG_DXVA2
#include <d3d9.h>
#endif

#if CONFIG_D3D11VA
#include <d3d11.h>
#endif


static int amf_filter_query_formats(AVFilterContext *avctx)
{
    const enum AVPixelFormat *output_pix_fmts;
    static const enum AVPixelFormat input_pix_fmts[] = {
        AV_PIX_FMT_NV12,
        AV_PIX_FMT_P010,
        AV_PIX_FMT_BGRA,
        AV_PIX_FMT_RGBA,
        AV_PIX_FMT_AMF_SURFACE,
        AV_PIX_FMT_RGBAF16,
        AV_PIX_FMT_NONE,
    };
    static const enum AVPixelFormat output_pix_fmts_default[] = {
        AV_PIX_FMT_NV12,
        AV_PIX_FMT_P010,
        AV_PIX_FMT_BGRA,
        AV_PIX_FMT_RGBA,
        AV_PIX_FMT_AMF_SURFACE,
        AV_PIX_FMT_D3D11,
        AV_PIX_FMT_DXVA2_VLD,
        AV_PIX_FMT_RGBAF16,
        AV_PIX_FMT_NONE,
    };
    output_pix_fmts = output_pix_fmts_default;

    return amf_setup_input_output_formats(avctx, input_pix_fmts, output_pix_fmts);
}

static int amf_filter_config_output(AVFilterLink *outlink)
{
    AVFilterContext *avctx = outlink->src;
    AVFilterLink   *inlink = avctx->inputs[0];
    AMFFilterContext  *ctx = avctx->priv;
    AMFSize out_size;
    int err;
    AMF_RESULT res;
    enum AVPixelFormat in_format;

    err = amf_init_filter_config(outlink, &in_format);
    if (err < 0)
        return err;

    // HQ scaler should be used for upscaling only
    if (inlink->w > outlink->w || inlink->h > outlink->h) {
        av_log(avctx, AV_LOG_ERROR, "AMF HQ scaler should be used for upscaling only.\n");
        return AVERROR_UNKNOWN;
    }
    // FIXME: add checks whether we have HW context
    res = ctx->amf_device_ctx->factory->pVtbl->CreateComponent(ctx->amf_device_ctx->factory, ctx->amf_device_ctx->context, AMFHQScaler, &ctx->component);
    AMF_RETURN_IF_FALSE(ctx, res == AMF_OK, AVERROR_FILTER_NOT_FOUND, "CreateComponent(%ls) failed with error %d\n", AMFHQScaler, res);

    out_size.width = outlink->w;
    out_size.height = outlink->h;
    AMF_ASSIGN_PROPERTY_SIZE(res, ctx->component, AMF_HQ_SCALER_OUTPUT_SIZE, out_size);
    AMF_RETURN_IF_FALSE(avctx, res == AMF_OK, AVERROR_UNKNOWN, "AMFHQScaler-SetProperty() failed with error %d\n", res);

    if (ctx->algorithm != -1) {
        AMF_ASSIGN_PROPERTY_INT64(res, ctx->component, AMF_HQ_SCALER_ALGORITHM, ctx->algorithm);
    }
    if (ctx->sharpness != -1) {
        AMF_ASSIGN_PROPERTY_DOUBLE(res, ctx->component, AMF_HQ_SCALER_SHARPNESS, ctx->sharpness);
    }
    AMF_ASSIGN_PROPERTY_BOOL(res, ctx->component, AMF_HQ_SCALER_FILL, ctx->fill);
    AMF_ASSIGN_PROPERTY_BOOL(res, ctx->component, AMF_HQ_SCALER_KEEP_ASPECT_RATIO, ctx->keep_ratio);
    // Setup default options to skip color conversion
    ctx->in_color_range = AMF_COLOR_RANGE_UNDEFINED;
    ctx->in_primaries = AMF_COLOR_PRIMARIES_UNDEFINED;
    ctx->in_trc = AMF_COLOR_TRANSFER_CHARACTERISTIC_UNDEFINED;
    ctx->color_profile = AMF_VIDEO_CONVERTER_COLOR_PROFILE_UNKNOWN;
    ctx->out_color_range = AMF_COLOR_RANGE_UNDEFINED;
    ctx->out_primaries = AMF_COLOR_PRIMARIES_UNDEFINED;
    ctx->out_trc = AMF_COLOR_TRANSFER_CHARACTERISTIC_UNDEFINED;

    res = ctx->component->pVtbl->Init(ctx->component, av_av_to_amf_format(in_format), inlink->w, inlink->h);
    AMF_RETURN_IF_FALSE(avctx, res == AMF_OK, AVERROR_UNKNOWN, "AMFHQScaler-Init() failed with error %d\n", res);

    return 0;
}

#define OFFSET(x) offsetof(AMFFilterContext, x)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
static const AVOption sr_amf_options[] = {
    { "w",              "Output video width",   OFFSET(w_expr),     AV_OPT_TYPE_STRING, { .str = "iw"   }, .flags = FLAGS },
    { "h",              "Output video height",  OFFSET(h_expr),     AV_OPT_TYPE_STRING, { .str = "ih"   }, .flags = FLAGS },

    { "format",         "Output pixel format",  OFFSET(format_str), AV_OPT_TYPE_STRING, { .str = "same" }, .flags = FLAGS },
    { "sharpness",      "Sharpness",            OFFSET(sharpness),  AV_OPT_TYPE_FLOAT,  { .dbl = -1 }, -1, 2., FLAGS, "sharpness" },
    { "keep-ratio",     "Keep aspect ratio",    OFFSET(keep_ratio), AV_OPT_TYPE_BOOL, { .i64 = 0  },  0, 1, FLAGS, "keep_ration" },
    { "fill",           "Fill",                 OFFSET(fill),       AV_OPT_TYPE_BOOL, { .i64 = 0  },  0, 1, FLAGS, "fill" },

    { "algorithm",      "Scaling algorithm",    OFFSET(algorithm),      AV_OPT_TYPE_INT,   { .i64 = -1 }, -1, AMF_HQ_SCALER_ALGORITHM_VIDEOSR1_1, FLAGS, "algorithm" },
    { "bilinear",       "Bilinear",             0,  AV_OPT_TYPE_CONST, { .i64 = AMF_HQ_SCALER_ALGORITHM_BILINEAR }, 0, 0, FLAGS, "algorithm" },
    { "bicubic",        "Bicubic",              0,  AV_OPT_TYPE_CONST, { .i64 = AMF_HQ_SCALER_ALGORITHM_BICUBIC }, 0, 0, FLAGS, "algorithm" },
    { "sr1-0",          "Video SR1.0",          0,  AV_OPT_TYPE_CONST, { .i64 = AMF_HQ_SCALER_ALGORITHM_VIDEOSR1_0 }, 0, 0, FLAGS, "algorithm" },
    { "point",          "Point",                0,  AV_OPT_TYPE_CONST, { .i64 = AMF_HQ_SCALER_ALGORITHM_POINT }, 0, 0, FLAGS, "algorithm" },
    { "sr1-1",          "Video SR1.1",          0,  AV_OPT_TYPE_CONST, { .i64 = AMF_HQ_SCALER_ALGORITHM_VIDEOSR1_1 }, 0, 0, FLAGS, "algorithm" },

    { NULL },
};


AVFILTER_DEFINE_CLASS(sr_amf);

static const AVFilterPad amf_filter_inputs[] = {
    {
        .name         = "default",
        .type         = AVMEDIA_TYPE_VIDEO,
        .filter_frame = amf_filter_filter_frame,
    }
};

static const AVFilterPad amf_filter_outputs[] = {
    {
        .name         = "default",
        .type         = AVMEDIA_TYPE_VIDEO,
        .config_props = amf_filter_config_output,
    }
};

FFFilter ff_vf_sr_amf = {
    .p.name      = "sr_amf",
    .p.description = NULL_IF_CONFIG_SMALL("AMF HQ video upscaling"),
    .p.priv_class = &sr_amf_class,
    .p.flags          = AVFILTER_FLAG_HWDEVICE,
    .priv_size = sizeof(AMFFilterContext),

    .init          = amf_filter_init,
    .uninit        = amf_filter_uninit,
    FILTER_INPUTS(amf_filter_inputs),
    FILTER_OUTPUTS(amf_filter_outputs),
    FILTER_QUERY_FUNC(&amf_filter_query_formats),
    .flags_internal = FF_FILTER_FLAG_HWFRAME_AWARE,
};