av_log(s->avctx, AV_LOG_DEBUG, "   quant level: %d\n", qlevel); assert(qlevel >= 0);
if(qlevel < 0){ av_log(s->avctx, AV_LOG_DEBUG, "qlevel %d not supported, maybe buggy stream\n", qlevel); return -1; }
static int decode_subframe_lpc(FLACContext *s, int channel, int pred_order){    int sum, i, j;    int coeff_prec, qlevel;    int coeffs[pred_order];        //    av_log(s->avctx, AV_LOG_DEBUG, "  SUBFRAME LPC\n");            /* warm up samples *///    av_log(s->avctx, AV_LOG_DEBUG, "   warm up samples: %d\n", pred_order);            for (i = 0; i < pred_order; i++)    {        s->decoded[channel][i] = get_sbits(&s->gb, s->curr_bps);//        av_log(s->avctx, AV_LOG_DEBUG, "    %d: %d\n", i, s->decoded[channel][i]);    }        coeff_prec = get_bits(&s->gb, 4) + 1;    if (coeff_prec == 16)    {        av_log(s->avctx, AV_LOG_DEBUG, "invalid coeff precision\n");        return -1;    }    av_log(s->avctx, AV_LOG_DEBUG, "   qlp coeff prec: %d\n", coeff_prec);    qlevel = get_sbits(&s->gb, 5);    av_log(s->avctx, AV_LOG_DEBUG, "   quant level: %d\n", qlevel);assert(qlevel >= 0); //FIXME    for (i = 0; i < pred_order; i++)    {        coeffs[i] = get_sbits(&s->gb, coeff_prec);//        av_log(s->avctx, AV_LOG_DEBUG, "    %d: %d\n", i, coeffs[i]);    }        if (decode_residuals(s, channel, pred_order) < 0)        return -1;    for (i = pred_order; i < s->blocksize; i++)    {        sum = 0;        for (j = 0; j < pred_order; j++)            sum += coeffs[j] * s->decoded[channel][i-j-1];        s->decoded[channel][i] += sum >> qlevel;    }        return 0;}