static void sbr_dequant(SpectralBandReplication *sbr, int id_aac) { int k, e; int ch; if (id_aac == TYPE_CPE && sbr->bs_coupling) { float alpha = sbr->data[0].bs_amp_res ? 1.0f : 0.5f; float pan_offset = sbr->data[0].bs_amp_res ? 12.0f : 24.0f; for (e = 1; e <= sbr->data[0].bs_num_env; e++) { for (k = 0; k < sbr->n[sbr->data[0].bs_freq_res[e]]; k++) { float temp1 = exp2f(sbr->data[0].env_facs[e][k] * alpha + 7.0f); float temp2 = exp2f((pan_offset - sbr->data[1].env_facs[e][k]) * alpha); float fac = temp1 / (1.0f + temp2); sbr->data[0].env_facs[e][k] = fac; sbr->data[1].env_facs[e][k] = fac * temp2; } } for (e = 1; e <= sbr->data[0].bs_num_noise; e++) { for (k = 0; k < sbr->n_q; k++) { float temp1 = exp2f(NOISE_FLOOR_OFFSET - sbr->data[0].noise_facs[e][k] + 1); float temp2 = exp2f(12 - sbr->data[1].noise_facs[e][k]); float fac = temp1 / (1.0f + temp2); sbr->data[0].noise_facs[e][k] = fac; sbr->data[1].noise_facs[e][k] = fac * temp2; } } } else { // SCE or one non-coupled CPE for (ch = 0; ch < (id_aac == TYPE_CPE) + 1; ch++) { float alpha = sbr->data[ch].bs_amp_res ? 1.0f : 0.5f; for (e = 1; e <= sbr->data[ch].bs_num_env; e++) for (k = 0; k < sbr->n[sbr->data[ch].bs_freq_res[e]]; k++) sbr->data[ch].env_facs[e][k] = exp2f(alpha * sbr->data[ch].env_facs[e][k] + 6.0f); for (e = 1; e <= sbr->data[ch].bs_num_noise; e++) for (k = 0; k < sbr->n_q; k++) sbr->data[ch].noise_facs[e][k] = exp2f(NOISE_FLOOR_OFFSET - sbr->data[ch].noise_facs[e][k]); } } }