/*

 * Prores Metadata bitstream filter

 * Copyright (c) 2018 Jokyo Images

 *

 * 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

 * Prores Metadata bitstream filter

 * set frame colorspace property

 */

#include "libavutil/common.h"

#include "libavutil/intreadwrite.h"

#include "libavutil/opt.h"

#include "bsf.h"

#include "bsf_internal.h"

typedef struct ProresMetadataContext {

    const AVClass *class;

    int color_primaries;

    int transfer_characteristics;

    int matrix_coefficients;

} ProresMetadataContext;

static int prores_metadata(AVBSFContext *bsf, AVPacket *pkt)

{

    ProresMetadataContext *ctx = bsf->priv_data;

    int ret = 0;

    int buf_size;

    uint8_t *buf;

    ret = ff_bsf_get_packet_ref(bsf, pkt);

    if (ret < 0)

        return ret;

    ret = av_packet_make_writable(pkt);

    if (ret < 0)

        goto fail;

    buf = pkt->data;

    buf_size = pkt->size;

    /* check start of the prores frame */

    if (buf_size < 28) {

        av_log(bsf, AV_LOG_ERROR, "not enough data in prores frame\n");

        ret = AVERROR_INVALIDDATA;

        goto fail;

    }

    if (AV_RL32(buf + 4) != AV_RL32("icpf")) {

        av_log(bsf, AV_LOG_ERROR, "invalid frame header\n");

        ret = AVERROR_INVALIDDATA;

        goto fail;

    }

    if (AV_RB16(buf + 8) < 28) {

        av_log(bsf, AV_LOG_ERROR, "invalid frame header size\n");

        ret = AVERROR_INVALIDDATA;

        goto fail;

    }

    /* set the new values */

    if (ctx->color_primaries != -1)

        buf[8+14] = ctx->color_primaries;

    if (ctx->transfer_characteristics != -1)

        buf[8+15] = ctx->transfer_characteristics;

    if (ctx->matrix_coefficients != -1)

        buf[8+16] = ctx->matrix_coefficients;

fail:

    if (ret < 0)

        av_packet_unref(pkt);

    return ret;

}

static const enum AVCodecID codec_ids[] = {

    AV_CODEC_ID_PRORES, AV_CODEC_ID_NONE,

};

static int prores_metadata_init(AVBSFContext *bsf)

{

    ProresMetadataContext *ctx = bsf->priv_data;

    /*! check options */

    switch (ctx->color_primaries) {

    case -1:

    case 0:

    case AVCOL_PRI_BT709:

    case AVCOL_PRI_BT470BG:

    case AVCOL_PRI_SMPTE170M:

    case AVCOL_PRI_BT2020:

    case AVCOL_PRI_SMPTE431:

    case AVCOL_PRI_SMPTE432:

        break;

    default:

        av_log(bsf, AV_LOG_ERROR, "Color primaries %d is not a valid value\n", ctx->color_primaries);

        return AVERROR(EINVAL);

    }

    switch (ctx->matrix_coefficients) {

    case -1:

    case 0:

    case AVCOL_SPC_BT709:

    case AVCOL_SPC_SMPTE170M:

    case AVCOL_SPC_BT2020_NCL:

        break;

    default:

        av_log(bsf, AV_LOG_ERROR, "Colorspace %d is not a valid value\n", ctx->matrix_coefficients);

        return AVERROR(EINVAL);

    }

    return 0;

}

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

#define FLAGS (AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_BSF_PARAM)

static const AVOption options[] = {

    {"color_primaries", "select color primaries", OFFSET(color_primaries), AV_OPT_TYPE_INT, {.i64=-1}, -1, AVCOL_PRI_SMPTE432, FLAGS, .unit = "color_primaries"},

    {"auto", "keep the same color primaries",  0, AV_OPT_TYPE_CONST, {.i64=-1},                     INT_MIN, INT_MAX, FLAGS, .unit = "color_primaries"},

    {"unknown",                         NULL,  0, AV_OPT_TYPE_CONST, {.i64=0},                      INT_MIN, INT_MAX, FLAGS, .unit = "color_primaries"},

    {"bt709",                           NULL,  0, AV_OPT_TYPE_CONST, {.i64=AVCOL_PRI_BT709},        INT_MIN, INT_MAX, FLAGS, .unit = "color_primaries"},

    {"bt470bg",                         NULL,  0, AV_OPT_TYPE_CONST, {.i64=AVCOL_PRI_BT470BG},      INT_MIN, INT_MAX, FLAGS, .unit = "color_primaries"},

    {"smpte170m",                       NULL,  0, AV_OPT_TYPE_CONST, {.i64=AVCOL_PRI_SMPTE170M},    INT_MIN, INT_MAX, FLAGS, .unit = "color_primaries"},

    {"bt2020",                          NULL,  0, AV_OPT_TYPE_CONST, {.i64=AVCOL_PRI_BT2020},       INT_MIN, INT_MAX, FLAGS, .unit = "color_primaries"},

    {"smpte431",                        NULL,  0, AV_OPT_TYPE_CONST, {.i64=AVCOL_PRI_SMPTE431},     INT_MIN, INT_MAX, FLAGS, .unit = "color_primaries"},

    {"smpte432",                        NULL,  0, AV_OPT_TYPE_CONST, {.i64=AVCOL_PRI_SMPTE432},     INT_MIN, INT_MAX, FLAGS, .unit = "color_primaries"},

    {"color_trc", "select color transfer", OFFSET(transfer_characteristics), AV_OPT_TYPE_INT, {.i64=-1}, -1, AVCOL_TRC_NB - 1, FLAGS, .unit = "color_trc"},

    {"auto", "keep the same color transfer",  0, AV_OPT_TYPE_CONST, {.i64=-1},                               INT_MIN, INT_MAX, FLAGS, .unit = "color_trc"},

    {"unknown",                        NULL,  0, AV_OPT_TYPE_CONST, {.i64=0},                                INT_MIN, INT_MAX, FLAGS, .unit = "color_trc"},

    {"bt709",                          NULL,  0, AV_OPT_TYPE_CONST, {.i64=AVCOL_TRC_BT709},                  INT_MIN, INT_MAX, FLAGS, .unit = "color_trc"},

    {"smpte2084",                      NULL,  0, AV_OPT_TYPE_CONST, {.i64=AVCOL_TRC_SMPTE2084},              INT_MIN, INT_MAX, FLAGS, .unit = "color_trc"},

    {"arib-std-b67",                   NULL,  0, AV_OPT_TYPE_CONST, {.i64=AVCOL_TRC_ARIB_STD_B67},           INT_MIN, INT_MAX, FLAGS, .unit = "color_trc"},

    {"colorspace", "select colorspace", OFFSET(matrix_coefficients), AV_OPT_TYPE_INT, {.i64=-1}, -1,  AVCOL_SPC_BT2020_NCL, FLAGS, .unit = "colorspace"},

    {"auto", "keep the same colorspace",  0, AV_OPT_TYPE_CONST, {.i64=-1},                            INT_MIN, INT_MAX, FLAGS, .unit = "colorspace"},

    {"unknown",                    NULL,  0, AV_OPT_TYPE_CONST, {.i64=0},                             INT_MIN, INT_MAX, FLAGS, .unit = "colorspace"},

    {"bt709",                      NULL,  0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_BT709},               INT_MIN, INT_MAX, FLAGS, .unit = "colorspace"},

    {"smpte170m",                  NULL,  0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_SMPTE170M},           INT_MIN, INT_MAX, FLAGS, .unit = "colorspace"},

    {"bt2020nc",                   NULL,  0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_BT2020_NCL},          INT_MIN, INT_MAX, FLAGS, .unit = "colorspace"},

    { NULL },

};

static const AVClass prores_metadata_class = {

    .class_name = "prores_metadata_bsf",

    .item_name  = av_default_item_name,

    .option     = options,

    .version    = LIBAVUTIL_VERSION_INT,

};

const FFBitStreamFilter ff_prores_metadata_bsf = {

    .p.name         = "prores_metadata",

    .p.codec_ids    = codec_ids,

    .p.priv_class   = &prores_metadata_class,

    .priv_data_size = sizeof(ProresMetadataContext),

    .init           = prores_metadata_init,

    .filter         = prores_metadata,

};