static int count_paired_channels(uint8_t (*layout_map)[3], int tags, int pos,
                                 int *current)
{
    int num_pos_channels = 0;
    int first_cpe        = 0;
    int sce_parity       = 0;
    int i;
    for (i = *current; i < tags; i++) {
        if (layout_map[i][2] != pos)
            break;
        if (layout_map[i][0] == TYPE_CPE) {
            if (sce_parity) {
                if (pos == AAC_CHANNEL_FRONT && !first_cpe) {
                    sce_parity = 0;
                } else {
                    return -1;
                }
            }
            num_pos_channels += 2;
            first_cpe         = 1;
        } else {
            num_pos_channels++;
            sce_parity ^= 1;
        }
    }
    if (sce_parity &&
        ((pos == AAC_CHANNEL_FRONT && first_cpe) || pos == AAC_CHANNEL_SIDE))
        return -1;
    *current = i;
    return num_pos_channels;
}
Unknown