+ if (s->options.multi_dim_quant) {
+ int allsteps = 1;
+ int i, step, improved;
+ int64_t best_score = INT64_MAX;
+ int32_t qmax;
+
+ qmax = (1 << (s->options.lpc_coeff_precision - 1)) - 1;
+
+ for (i=0; i<opt_order; i++)
+ allsteps *= 3;
+
+ do {
+ improved = 0;
+ for (step = 0; step < allsteps; step++) {
+ int tmp = step;
+ int32_t lpc_try[MAX_LPC_ORDER];
+ int64_t score = 0;
+ int diffsum = 0;
+
+ for (i=0; i<opt_order; i++) {
+ int diff = ((tmp + 1) % 3) - 1;
+ lpc_try[i] = av_clip(coefs[opt_order - 1][i] + diff, -qmax, qmax);
+ tmp /= 3;
+ diffsum += !!diff;
+ }
+ if (diffsum >8)
+ continue;
+
+ if (s->bps_code * 4 + s->options.lpc_coeff_precision + av_log2(opt_order - 1) <= 32) {
+ s->flac_dsp.lpc16_encode(res, smp, n, opt_order, lpc_try, shift[opt_order-1]);
+ } else {
+ s->flac_dsp.lpc32_encode(res, smp, n, opt_order, lpc_try, shift[opt_order-1]);
+ }
+ score = find_subframe_rice_params(s, sub, opt_order);
+ if (score < best_score) {
+ best_score = score;
+ memcpy(coefs[opt_order-1], lpc_try, sizeof(*coefs));
+ improved=1;
+ }
+ }
+ } while(improved);
+ }
+