Chisato Kenmochi | 9470443 | 2017-01-10 11:56:48 +0900 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2003 - 2016 Sony Corporation |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #include "ldac.h" |
| 18 | |
| 19 | /*************************************************************************************************** |
| 20 | Subfunction: Get Scale Factor Index |
| 21 | ***************************************************************************************************/ |
| 22 | __inline static int get_scale_factor_id_ldac( |
| 23 | INT32 val) |
| 24 | { |
| 25 | int i; |
| 26 | int id, step; |
| 27 | |
| 28 | if (ga_sf_ldac[0] > val) { |
| 29 | return 0; |
| 30 | } |
| 31 | |
| 32 | id = LDAC_NIDSF >> 1; |
| 33 | step = LDAC_NIDSF >> 2; |
| 34 | for (i = 0; i < LDAC_IDSFBITS-1; i++) { |
| 35 | if (ga_sf_ldac[id] > val) { |
| 36 | id -= step; |
| 37 | } |
| 38 | else { |
| 39 | id += step; |
| 40 | } |
| 41 | step >>= 1; |
| 42 | } |
| 43 | |
| 44 | if ((ga_sf_ldac[id] <= val) && (id < LDAC_NIDSF-1)) { |
| 45 | id++; |
| 46 | } |
| 47 | |
| 48 | return id; |
| 49 | } |
| 50 | |
| 51 | /*************************************************************************************************** |
| 52 | Normalize Spectrum |
| 53 | ***************************************************************************************************/ |
| 54 | static INT32 sa_val_ldac[LDAC_MAXNSPS] = { /* Q31 */ |
| 55 | 0xa0000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, |
| 56 | 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, |
| 57 | }; |
| 58 | |
| 59 | DECLFUNC void norm_spectrum_ldac( |
| 60 | AC *p_ac) |
| 61 | { |
| 62 | int iqu, isp; |
| 63 | int lsp, hsp; |
| 64 | int nqus = p_ac->p_ab->nqus; |
| 65 | int idsf; |
| 66 | INT32 maxspec, tmp; |
| 67 | INT32 *p_spec = p_ac->p_acsub->a_spec; |
| 68 | |
| 69 | for (iqu = 0; iqu < nqus; iqu++) { |
| 70 | lsp = ga_isp_ldac[iqu]; |
| 71 | hsp = ga_isp_ldac[iqu+1]; |
| 72 | |
| 73 | maxspec = abs(p_spec[lsp]); |
| 74 | for (isp = lsp+1; isp < hsp; isp++) { |
| 75 | tmp = abs(p_spec[isp]); |
| 76 | if (maxspec < tmp) { |
| 77 | maxspec = tmp; |
| 78 | } |
| 79 | } |
| 80 | idsf = get_scale_factor_id_ldac(maxspec); |
| 81 | |
| 82 | if (idsf > 0) { |
| 83 | for (isp = lsp; isp < hsp; isp++) { |
| 84 | p_spec[isp] = sftrnd_ldac(p_spec[isp], idsf-LDAC_Q_NORM); |
| 85 | } |
| 86 | } |
| 87 | else { |
| 88 | for (isp = lsp; isp < hsp; isp++) { |
| 89 | p_spec[isp] = sa_val_ldac[isp-lsp]; |
| 90 | } |
| 91 | } |
| 92 | |
| 93 | p_ac->a_idsf[iqu] = idsf; |
| 94 | } |
| 95 | |
| 96 | return; |
| 97 | } |
| 98 | |
| 99 | /*************************************************************************************************** |
| 100 | Subfunction: Quantize Spectrum Core |
| 101 | ***************************************************************************************************/ |
| 102 | __inline static void quant_spectrum_core_ldac( |
| 103 | AC *p_ac, |
| 104 | int iqu) |
| 105 | { |
| 106 | int i; |
| 107 | int isp = ga_isp_ldac[iqu]; |
| 108 | int nsps = ga_nsps_ldac[iqu]; |
| 109 | int *p_qspec = p_ac->a_qspec+isp; |
| 110 | INT32 qf = ga_qf_ldac[p_ac->a_idwl1[iqu]]; |
| 111 | INT32 *p_nspec = p_ac->p_acsub->a_spec+isp; |
| 112 | |
| 113 | for (i = 0; i < nsps; i++) { |
| 114 | /* Q00 <- Q31 * Q16 */ |
| 115 | p_qspec[i] = mul_rsftrnd_ldac(p_nspec[i], qf, LDAC_Q_QUANT1); |
| 116 | } |
| 117 | |
| 118 | return; |
| 119 | } |
| 120 | |
| 121 | /*************************************************************************************************** |
| 122 | Quantize Spectrum |
| 123 | ***************************************************************************************************/ |
| 124 | DECLFUNC void quant_spectrum_ldac( |
| 125 | AC *p_ac) |
| 126 | { |
| 127 | int iqu; |
| 128 | int nqus = p_ac->p_ab->nqus; |
| 129 | |
| 130 | for (iqu = 0; iqu < nqus; iqu++) { |
| 131 | quant_spectrum_core_ldac(p_ac, iqu); |
| 132 | } |
| 133 | |
| 134 | return; |
| 135 | } |
| 136 | |
| 137 | /*************************************************************************************************** |
| 138 | Subfunction: Quantize Residual Spectrum Core |
| 139 | ***************************************************************************************************/ |
| 140 | __inline static void quant_residual_core_ldac( |
| 141 | AC *p_ac, |
| 142 | int iqu) |
| 143 | { |
| 144 | int i; |
| 145 | int isp = ga_isp_ldac[iqu]; |
| 146 | int nsps = ga_nsps_ldac[iqu]; |
| 147 | int *p_qspec = p_ac->a_qspec+isp; |
| 148 | int *p_rspec = p_ac->a_rspec+isp; |
| 149 | INT32 ldqspec, rnspec; |
| 150 | INT32 iqf = ga_iqf_ldac[LDAC_MAXIDWL1]; |
| 151 | INT32 rqf = ga_qf_ldac[p_ac->a_idwl2[iqu]]; |
| 152 | INT32 irsf = ga_irsf_ldac[LDAC_MAXIDWL1]; |
| 153 | INT32 *p_nspec = p_ac->p_acsub->a_spec+isp; |
| 154 | |
| 155 | for (i = 0; i < nsps; i++) { |
| 156 | /* Q31 <- Q00 * Q31 */ |
| 157 | ldqspec = mul_lsftrnd_ldac(p_qspec[i], iqf, LDAC_Q_QUANT2); |
| 158 | /* Q31 <- (Q31 - Q31) * Q15 */ |
| 159 | rnspec = mul_rsftrnd_ldac(p_nspec[i]-ldqspec, irsf, LDAC_Q_QUANT3); |
| 160 | /* Q00 <- Q31 * Q16 */ |
| 161 | p_rspec[i] = mul_rsftrnd_ldac(rnspec, rqf, LDAC_Q_QUANT4); |
| 162 | } |
| 163 | |
| 164 | return; |
| 165 | } |
| 166 | |
| 167 | /*************************************************************************************************** |
| 168 | Quantize Residual Spectrum |
| 169 | ***************************************************************************************************/ |
| 170 | DECLFUNC void quant_residual_ldac( |
| 171 | AC *p_ac) |
| 172 | { |
| 173 | int iqu; |
| 174 | int nqus = p_ac->p_ab->nqus; |
| 175 | int *p_idwl2 = p_ac->a_idwl2; |
| 176 | |
| 177 | for (iqu = 0; iqu < nqus; iqu++) { |
| 178 | if (p_idwl2[iqu] > 0) { |
| 179 | quant_residual_core_ldac(p_ac, iqu); |
| 180 | } |
| 181 | } |
| 182 | |
| 183 | return; |
| 184 | } |
| 185 | |