/*

 * 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

 */

#include "libavutil/log.h"

#include "libavutil/opt.h"

#include "bsf.h"

#include "bsf_internal.h"

#include "cbs.h"

#include "cbs_bsf.h"

#include "cbs_vp9.h"

typedef struct VP9MetadataContext {

    CBSBSFContext common;

    int color_space;

    int color_range;

    int color_warnings;

} VP9MetadataContext;

static int vp9_metadata_update_fragment(AVBSFContext *bsf, AVPacket *pkt,

                                        CodedBitstreamFragment *frag)

{

    VP9MetadataContext *ctx = bsf->priv_data;

    int i;

    for (i = 0; i < frag->nb_units; i++) {

        VP9RawFrame *frame = frag->units[i].content;

        VP9RawFrameHeader *header = &frame->header;

        int profile = (header->profile_high_bit << 1) + header->profile_low_bit;

        if (header->frame_type == VP9_KEY_FRAME ||

            header->intra_only && profile > 0) {

            if (ctx->color_space >= 0) {

                if (!(profile & 1) && ctx->color_space == VP9_CS_RGB) {

                    if (!(ctx->color_warnings & 2)) {

                        av_log(bsf, AV_LOG_WARNING, "Warning: RGB "

                               "incompatible with profiles 0 and 2.\n");

                        ctx->color_warnings |= 2;

                    }

                } else

                    header->color_space = ctx->color_space;

            }

            if (ctx->color_range >= 0)

                header->color_range = ctx->color_range;

            if (header->color_space == VP9_CS_RGB) {

                if (!(ctx->color_warnings & 1) && !header->color_range) {

                    av_log(bsf, AV_LOG_WARNING, "Warning: Color space RGB "

                           "implicitly sets color range to PC range.\n");

                    ctx->color_warnings |= 1;

                }

                header->color_range = 1;

            }

        } else if (!(ctx->color_warnings & 4) && header->intra_only && !profile &&

                   ctx->color_space >= 0 && ctx->color_space != VP9_CS_BT_601) {

            av_log(bsf, AV_LOG_WARNING, "Warning: Intra-only frames in "

                   "profile 0 are automatically BT.601.\n");

            ctx->color_warnings |= 4;

        }

    }

    return 0;

}

static const CBSBSFType vp9_metadata_type = {

    .codec_id        = AV_CODEC_ID_VP9,

    .fragment_name   = "superframe",

    .unit_name       = "frame",

    .update_fragment = &vp9_metadata_update_fragment,

};

static int vp9_metadata_init(AVBSFContext *bsf)

{

    return ff_cbs_bsf_generic_init(bsf, &vp9_metadata_type);

}

#define OFFSET(x) offsetof(VP9MetadataContext, x)

#define FLAGS (AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_BSF_PARAM)

static const AVOption vp9_metadata_options[] = {

    { "color_space", "Set colour space (section 7.2.2)",

        OFFSET(color_space), AV_OPT_TYPE_INT,

        { .i64 = -1 }, -1, VP9_CS_RGB, FLAGS, .unit = "cs" },

    { "unknown",  "Unknown/unspecified",  0, AV_OPT_TYPE_CONST,

        { .i64 = VP9_CS_UNKNOWN   }, .flags = FLAGS, .unit = "cs" },

    { "bt601",    "ITU-R BT.601-7",       0, AV_OPT_TYPE_CONST,

        { .i64 = VP9_CS_BT_601    }, .flags = FLAGS, .unit = "cs" },

    { "bt709",    "ITU-R BT.709-6",       0, AV_OPT_TYPE_CONST,

        { .i64 = VP9_CS_BT_709    }, .flags = FLAGS, .unit = "cs" },

    { "smpte170", "SMPTE-170",            0, AV_OPT_TYPE_CONST,

        { .i64 = VP9_CS_SMPTE_170 }, .flags = FLAGS, .unit = "cs" },

    { "smpte240", "SMPTE-240",            0, AV_OPT_TYPE_CONST,

        { .i64 = VP9_CS_SMPTE_240 }, .flags = FLAGS, .unit = "cs" },

    { "bt2020",   "ITU-R BT.2020-2",      0, AV_OPT_TYPE_CONST,

        { .i64 = VP9_CS_BT_2020   }, .flags = FLAGS, .unit = "cs" },

    { "rgb",      "sRGB / IEC 61966-2-1", 0, AV_OPT_TYPE_CONST,

        { .i64 = VP9_CS_RGB       }, .flags = FLAGS, .unit = "cs" },

    { "color_range", "Set colour range (section 7.2.2)",

        OFFSET(color_range), AV_OPT_TYPE_INT,

        { .i64 = -1 }, -1, 1, FLAGS, .unit = "cr" },

    { "tv", "TV (limited) range", 0, AV_OPT_TYPE_CONST,

        { .i64 = 0 }, .flags = FLAGS, .unit = "cr" },

    { "pc", "PC (full) range",    0, AV_OPT_TYPE_CONST,

        { .i64 = 1 }, .flags = FLAGS, .unit = "cr" },

    { NULL }

};

static const AVClass vp9_metadata_class = {

    .class_name = "vp9_metadata_bsf",

    .item_name  = av_default_item_name,

    .option     = vp9_metadata_options,

    .version    = LIBAVUTIL_VERSION_INT,

};

static const enum AVCodecID vp9_metadata_codec_ids[] = {

    AV_CODEC_ID_VP9, AV_CODEC_ID_NONE,

};

const FFBitStreamFilter ff_vp9_metadata_bsf = {

    .p.name         = "vp9_metadata",

    .p.codec_ids    = vp9_metadata_codec_ids,

    .p.priv_class   = &vp9_metadata_class,

    .priv_data_size = sizeof(VP9MetadataContext),

    .init           = &vp9_metadata_init,

    .close          = &ff_cbs_bsf_generic_close,

    .filter         = &ff_cbs_bsf_generic_filter,

};