static void decode_gray_bitstream(HYuvContext *s, int count)
{
    int i;
    OPEN_READER(re, &s->gb);
    count/=2;

    if (count >= (get_bits_left(&s->gb)) / (31 * 2)) {
        for (i = 0; i < count && get_bits_left(&s->gb) > 0; i++) {
            READ_2PIX(s->temp[0][2 * i], s->temp[0][2 * i + 1], 0);
        }
    } else {
        for(i=0; i<count; i++){
            READ_2PIX(s->temp[0][2 * i], s->temp[0][2 * i + 1], 0);
        }
    }
    CLOSE_READER(re, &s->gb);
}