static void sbr_dequant(SpectralBandReplication *sbr, int id_aac) { int k, e; int ch; if (id_aac == TYPE_CPE && sbr->bs_coupling) { int alpha = sbr->data[0].bs_amp_res ? 2 : 1; int pan_offset = sbr->data[0].bs_amp_res ? 12 : 24; 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++) { SoftFloat temp1, temp2, fac; temp1.exp = sbr->data[0].env_facs[e][k].mant * alpha + 14; if (temp1.exp & 1) temp1.mant = 759250125; else temp1.mant = 0x20000000; temp1.exp = (temp1.exp >> 1) + 1; if (temp1.exp > 66) { // temp1 > 1E20 av_log(NULL, AV_LOG_ERROR, "envelope scalefactor overflow in dequant\n"); temp1 = FLOAT_1; } temp2.exp = (pan_offset - sbr->data[1].env_facs[e][k].mant) * alpha; if (temp2.exp & 1) temp2.mant = 759250125; else temp2.mant = 0x20000000; temp2.exp = (temp2.exp >> 1) + 1; fac = av_div_sf(temp1, av_add_sf(FLOAT_1, temp2)); sbr->data[0].env_facs[e][k] = fac; sbr->data[1].env_facs[e][k] = av_mul_sf(fac, temp2); } } for (e = 1; e <= sbr->data[0].bs_num_noise; e++) { for (k = 0; k < sbr->n_q; k++) { SoftFloat temp1, temp2, fac; temp1.exp = NOISE_FLOOR_OFFSET - \ sbr->data[0].noise_facs[e][k].mant + 2; temp1.mant = 0x20000000; if (temp1.exp > 66) { // temp1 > 1E20 av_log(NULL, AV_LOG_ERROR, "envelope scalefactor overflow in dequant\n"); temp1 = FLOAT_1; } temp2.exp = 12 - sbr->data[1].noise_facs[e][k].mant + 1; temp2.mant = 0x20000000; fac = av_div_sf(temp1, av_add_sf(FLOAT_1, temp2)); sbr->data[0].noise_facs[e][k] = fac; sbr->data[1].noise_facs[e][k] = av_mul_sf(fac, temp2); } } } else { // SCE or one non-coupled CPE for (ch = 0; ch < (id_aac == TYPE_CPE) + 1; ch++) { int alpha = sbr->data[ch].bs_amp_res ? 2 : 1; 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++){ SoftFloat temp1; temp1.exp = alpha * sbr->data[ch].env_facs[e][k].mant + 12; if (temp1.exp & 1) temp1.mant = 759250125; else temp1.mant = 0x20000000; temp1.exp = (temp1.exp >> 1) + 1; if (temp1.exp > 66) { // temp1 > 1E20 av_log(NULL, AV_LOG_ERROR, "envelope scalefactor overflow in dequant\n"); temp1 = FLOAT_1; } sbr->data[ch].env_facs[e][k] = temp1; } 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].exp = NOISE_FLOOR_OFFSET - \ sbr->data[ch].noise_facs[e][k].mant + 1; sbr->data[ch].noise_facs[e][k].mant = 0x20000000; } } } }