FFmpeg/libavcodec/prores_metadata_bsf.c

/*
 * 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"

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, "color_primaries"},
    {"auto", "keep the same color primaries",  0, AV_OPT_TYPE_CONST, {.i64=-1},                     INT_MIN, INT_MAX, FLAGS, "color_primaries"},
    {"unknown",                         NULL,  0, AV_OPT_TYPE_CONST, {.i64=0},                      INT_MIN, INT_MAX, FLAGS, "color_primaries"},
    {"bt709",                           NULL,  0, AV_OPT_TYPE_CONST, {.i64=AVCOL_PRI_BT709},        INT_MIN, INT_MAX, FLAGS, "color_primaries"},
    {"bt470bg",                         NULL,  0, AV_OPT_TYPE_CONST, {.i64=AVCOL_PRI_BT470BG},      INT_MIN, INT_MAX, FLAGS, "color_primaries"},
    {"smpte170m",                       NULL,  0, AV_OPT_TYPE_CONST, {.i64=AVCOL_PRI_SMPTE170M},    INT_MIN, INT_MAX, FLAGS, "color_primaries"},
    {"bt2020",                          NULL,  0, AV_OPT_TYPE_CONST, {.i64=AVCOL_PRI_BT2020},       INT_MIN, INT_MAX, FLAGS, "color_primaries"},
    {"smpte431",                        NULL,  0, AV_OPT_TYPE_CONST, {.i64=AVCOL_PRI_SMPTE431},     INT_MIN, INT_MAX, FLAGS, "color_primaries"},
    {"smpte432",                        NULL,  0, AV_OPT_TYPE_CONST, {.i64=AVCOL_PRI_SMPTE432},     INT_MIN, INT_MAX, FLAGS, "color_primaries"},

    {"color_trc", "select color transfer", OFFSET(transfer_characteristics), AV_OPT_TYPE_INT, {.i64=-1}, -1, AVCOL_TRC_BT709, FLAGS, "color_trc"},
    {"auto", "keep the same color transfer",  0, AV_OPT_TYPE_CONST, {.i64=-1},                               INT_MIN, INT_MAX, FLAGS, "color_trc"},
    {"unknown",                        NULL,  0, AV_OPT_TYPE_CONST, {.i64=0},                                INT_MIN, INT_MAX, FLAGS, "color_trc"},
    {"bt709",                          NULL,  0, AV_OPT_TYPE_CONST, {.i64=AVCOL_TRC_BT709},                  INT_MIN, INT_MAX, FLAGS, "color_trc"},

    {"colorspace", "select colorspace", OFFSET(matrix_coefficients), AV_OPT_TYPE_INT, {.i64=-1}, -1,  AVCOL_SPC_BT2020_NCL, FLAGS, "colorspace"},
    {"auto", "keep the same colorspace",  0, AV_OPT_TYPE_CONST, {.i64=-1},                            INT_MIN, INT_MAX, FLAGS, "colorspace"},
    {"unknown",                    NULL,  0, AV_OPT_TYPE_CONST, {.i64=0},                             INT_MIN, INT_MAX, FLAGS, "colorspace"},
    {"bt709",                      NULL,  0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_BT709},               INT_MIN, INT_MAX, FLAGS, "colorspace"},
    {"smpte170m",                  NULL,  0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_SMPTE170M},           INT_MIN, INT_MAX, FLAGS, "colorspace"},
    {"bt2020nc",                   NULL,  0, AV_OPT_TYPE_CONST, {.i64=AVCOL_SPC_BT2020_NCL},          INT_MIN, INT_MAX, FLAGS, "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 AVBitStreamFilter ff_prores_metadata_bsf = {
    .name       = "prores_metadata",
    .init       = prores_metadata_init,
    .filter     = prores_metadata,
    .priv_data_size = sizeof(ProresMetadataContext),
    .priv_class = &prores_metadata_class,
    .codec_ids  = codec_ids,
};