static int mov_read_colr(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    AVStream *st;
    char color_parameter_type[5] = { 0 };
    int color_primaries, color_trc, color_matrix;

    if (c->fc->nb_streams < 1)
        return 0;
    st = c->fc->streams[c->fc->nb_streams - 1];

    avio_read(pb, color_parameter_type, 4);
    if (strncmp(color_parameter_type, "nclx", 4) &&
        strncmp(color_parameter_type, "nclc", 4)) {
        av_log(c->fc, AV_LOG_WARNING, "unsupported color_parameter_type %s\n",
               color_parameter_type);
        return 0;
    }

    color_primaries = avio_rb16(pb);
    color_trc = avio_rb16(pb);
    color_matrix = avio_rb16(pb);

    av_dlog(c->fc, "%s: pri %d trc %d matrix %d",
            color_parameter_type, color_primaries, color_trc, color_matrix);

    if (strncmp(color_parameter_type, "nclx", 4) == 0) {
        uint8_t color_range = avio_r8(pb) >> 7;
        av_dlog(c->fc, " full %"PRIu8"", color_range);
        if (color_range)
            st->codec->color_range = AVCOL_RANGE_JPEG;
        else
            st->codec->color_range = AVCOL_RANGE_MPEG;
        /* 14496-12 references JPEG XR specs (rather than the more complete
         * 23001-8) so some adjusting is required */
        if (color_primaries >= AVCOL_PRI_FILM)
            color_primaries = AVCOL_PRI_UNSPECIFIED;
        if ((color_trc >= AVCOL_TRC_LINEAR &&
             color_trc <= AVCOL_TRC_LOG_SQRT) ||
            color_trc >= AVCOL_TRC_BT2020_10)
            color_trc = AVCOL_TRC_UNSPECIFIED;
        if (color_matrix >= AVCOL_SPC_BT2020_NCL)
            color_matrix = AVCOL_SPC_UNSPECIFIED;
        st->codec->color_primaries = color_primaries;
        st->codec->color_trc = color_trc;
        st->codec->colorspace = color_matrix;
    } else {
        /* color primaries, Table 4-4 */
        switch (color_primaries) {
        case 1: st->codec->color_primaries = AVCOL_PRI_BT709; break;
        case 5: st->codec->color_primaries = AVCOL_PRI_SMPTE170M; break;
        case 6: st->codec->color_primaries = AVCOL_PRI_SMPTE240M; break;
        }
        /* color transfer, Table 4-5 */
        switch (color_trc) {
        case 1: st->codec->color_trc = AVCOL_TRC_BT709; break;
        case 7: st->codec->color_trc = AVCOL_TRC_SMPTE240M; break;
        }
        /* color matrix, Table 4-6 */
        switch (color_matrix) {
        case 1: st->codec->colorspace = AVCOL_SPC_BT709; break;
        case 6: st->codec->colorspace = AVCOL_SPC_BT470BG; break;
        case 7: st->codec->colorspace = AVCOL_SPC_SMPTE240M; break;
        }
    }
    av_dlog(c->fc, "\n");

    return 0;
}