1 /* ------------------------------------------------------------------ 2 * Copyright (C) 1998-2009 PacketVideo 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 13 * express or implied. 14 * See the License for the specific language governing permissions 15 * and limitations under the License. 16 * ------------------------------------------------------------------- 17 */ 18 /* 19 ------------------------------------------------------------------------------ 20 21 PacketVideo Corp. 22 MP3 Decoder Library 23 24 Filename: mdct_18.cpp 25 26 Date: 09/21/2007 27 28 ------------------------------------------------------------------------------ 29 REVISION HISTORY 30 31 32 Description: 33 34 ------------------------------------------------------------------------------ 35 INPUT AND OUTPUT DEFINITIONS 36 37 Input 38 int32 vec[], input vector of length 18 39 int32 *history input for overlap and add, vector updated with 40 next overlap and add values 41 const int32 *window sine window used in the mdct, three types are allowed 42 noraml, start and stop 43 Returns 44 none mdct computation in-place 45 46 47 ------------------------------------------------------------------------------ 48 FUNCTION DESCRIPTION 49 50 Returns the mdct of length 18 of the input vector, as well as the overlap 51 vector for next iteration ( on history[]) 52 53 ------------------------------------------------------------------------------ 54 REQUIREMENTS 55 56 57 ------------------------------------------------------------------------------ 58 REFERENCES 59 60 ------------------------------------------------------------------------------ 61 PSEUDO-CODE 62 63 ------------------------------------------------------------------------------ 64 */ 65 66 #if ( !defined(PV_ARM_GCC_V5) && !defined(PV_ARM_GCC_V4) && !defined(PV_ARM_V5) && !defined(PV_ARM_V4) ) 67 /*---------------------------------------------------------------------------- 68 ; INCLUDES 69 ----------------------------------------------------------------------------*/ 70 71 #include "pv_mp3dec_fxd_op.h" 72 #include "pvmp3_mdct_18.h" 73 74 75 /*---------------------------------------------------------------------------- 76 ; MACROS 77 ; Define module specific macros here 78 ----------------------------------------------------------------------------*/ 79 80 81 /*---------------------------------------------------------------------------- 82 ; DEFINES 83 ; Include all pre-processor statements here. Include conditional 84 ; compile variables also. 85 ----------------------------------------------------------------------------*/ 86 87 /*---------------------------------------------------------------------------- 88 ; LOCAL FUNCTION DEFINITIONS 89 ; Function Prototype declaration 90 ----------------------------------------------------------------------------*/ 91 92 /*---------------------------------------------------------------------------- 93 ; LOCAL STORE/BUFFER/POINTER DEFINITIONS 94 ; Variable declaration - defined here and used outside this module 95 ----------------------------------------------------------------------------*/ 96 const int32 cosTerms_dct18[9] = 97 { 98 Qfmt(0.50190991877167f), Qfmt(0.51763809020504f), Qfmt(0.55168895948125f), 99 Qfmt(0.61038729438073f), Qfmt(0.70710678118655f), Qfmt(0.87172339781055f), 100 Qfmt(1.18310079157625f), Qfmt(1.93185165257814f), Qfmt(5.73685662283493f) 101 }; 102 103 104 const int32 cosTerms_1_ov_cos_phi[18] = 105 { 106 107 Qfmt1(0.50047634258166f), Qfmt1(0.50431448029008f), Qfmt1(0.51213975715725f), 108 Qfmt1(0.52426456257041f), Qfmt1(0.54119610014620f), Qfmt1(0.56369097343317f), 109 Qfmt1(0.59284452371708f), Qfmt1(0.63023620700513f), Qfmt1(0.67817085245463f), 110 111 Qfmt2(0.74009361646113f), Qfmt2(0.82133981585229f), Qfmt2(0.93057949835179f), 112 Qfmt2(1.08284028510010f), Qfmt2(1.30656296487638f), Qfmt2(1.66275476171152f), 113 Qfmt2(2.31011315767265f), Qfmt2(3.83064878777019f), Qfmt2(11.46279281302667f) 114 }; 115 116 /*---------------------------------------------------------------------------- 117 ; EXTERNAL FUNCTION REFERENCES 118 ; Declare functions defined elsewhere and referenced in this module 119 ----------------------------------------------------------------------------*/ 120 121 /*---------------------------------------------------------------------------- 122 ; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES 123 ; Declare variables used in this module but defined elsewhere 124 ----------------------------------------------------------------------------*/ 125 126 /*---------------------------------------------------------------------------- 127 ; FUNCTION CODE 128 ----------------------------------------------------------------------------*/ 129 130 131 132 void pvmp3_mdct_18(int32 vec[], int32 *history, const int32 *window) 133 { 134 int32 i; 135 int32 tmp; 136 int32 tmp1; 137 int32 tmp2; 138 int32 tmp3; 139 int32 tmp4; 140 141 142 143 const int32 *pt_cos_split = cosTerms_dct18; 144 const int32 *pt_cos = cosTerms_1_ov_cos_phi; 145 const int32 *pt_cos_x = &cosTerms_1_ov_cos_phi[17]; 146 int32 *pt_vec = vec; 147 int32 *pt_vec_o = &vec[17]; 148 149 150 for (i = 9; i != 0; i--) 151 { 152 tmp = *(pt_vec); 153 tmp1 = *(pt_vec_o); 154 tmp = fxp_mul32_Q32(tmp << 1, *(pt_cos++)); 155 tmp1 = fxp_mul32_Q27(tmp1, *(pt_cos_x--)); 156 *(pt_vec++) = tmp + tmp1 ; 157 *(pt_vec_o--) = fxp_mul32_Q28((tmp - tmp1), *(pt_cos_split++)); 158 } 159 160 161 pvmp3_dct_9(vec); // Even terms 162 pvmp3_dct_9(&vec[9]); // Odd terms 163 164 165 tmp3 = vec[16]; // 166 vec[16] = vec[ 8]; 167 tmp4 = vec[14]; // 168 vec[14] = vec[ 7]; 169 tmp = vec[12]; 170 vec[12] = vec[ 6]; 171 tmp2 = vec[10]; // vec[10] 172 vec[10] = vec[ 5]; 173 vec[ 8] = vec[ 4]; 174 vec[ 6] = vec[ 3]; 175 vec[ 4] = vec[ 2]; 176 vec[ 2] = vec[ 1]; 177 vec[ 1] = vec[ 9] - tmp2; // vec[9] + vec[10] 178 vec[ 3] = vec[11] - tmp2; 179 vec[ 5] = vec[11] - tmp; 180 vec[ 7] = vec[13] - tmp; 181 vec[ 9] = vec[13] - tmp4; 182 vec[11] = vec[15] - tmp4; 183 vec[13] = vec[15] - tmp3; 184 vec[15] = vec[17] - tmp3; 185 186 187 /* overlap and add */ 188 189 tmp2 = vec[0]; 190 tmp3 = vec[9]; 191 192 for (i = 0; i < 6; i++) 193 { 194 tmp = history[ i]; 195 tmp4 = vec[i+10]; 196 vec[i+10] = tmp3 + tmp4; 197 tmp1 = vec[i+1]; 198 vec[ i] = fxp_mac32_Q32(tmp, (vec[i+10]), window[ i]); 199 tmp3 = tmp4; 200 history[i ] = -(tmp2 + tmp1); 201 tmp2 = tmp1; 202 } 203 204 tmp = history[ 6]; 205 tmp4 = vec[16]; 206 vec[16] = tmp3 + tmp4; 207 tmp1 = vec[7]; 208 vec[ 6] = fxp_mac32_Q32(tmp, vec[16] << 1, window[ i]); 209 tmp = history[ 7]; 210 history[6] = -(tmp2 + tmp1); 211 history[7] = -(tmp1 + vec[8]); 212 213 tmp1 = history[ 8]; 214 tmp4 = vec[17] + tmp4; 215 vec[ 7] = fxp_mac32_Q32(tmp, tmp4 << 1, window[ 7]); 216 history[8] = -(vec[8] + vec[9]); 217 vec[ 8] = fxp_mac32_Q32(tmp1, vec[17] << 1, window[ 8]); 218 219 tmp = history[9]; 220 tmp1 = history[17]; 221 tmp2 = history[16]; 222 vec[ 9] = fxp_mac32_Q32(tmp, vec[17] << 1, window[ 9]); 223 224 vec[17] = fxp_mac32_Q32(tmp1, vec[10] << 1, window[17]); 225 vec[10] = -vec[ 16]; 226 vec[16] = fxp_mac32_Q32(tmp2, vec[11] << 1, window[16]); 227 tmp1 = history[15]; 228 tmp2 = history[14]; 229 vec[11] = -vec[ 15]; 230 vec[15] = fxp_mac32_Q32(tmp1, vec[12] << 1, window[15]); 231 vec[12] = -vec[ 14]; 232 vec[14] = fxp_mac32_Q32(tmp2, vec[13] << 1, window[14]); 233 234 tmp = history[13]; 235 tmp1 = history[12]; 236 tmp2 = history[11]; 237 tmp3 = history[10]; 238 vec[13] = fxp_mac32_Q32(tmp, vec[12] << 1, window[13]); 239 vec[12] = fxp_mac32_Q32(tmp1, vec[11] << 1, window[12]); 240 vec[11] = fxp_mac32_Q32(tmp2, vec[10] << 1, window[11]); 241 vec[10] = fxp_mac32_Q32(tmp3, tmp4 << 1, window[10]); 242 243 244 /* next iteration overlap */ 245 246 tmp1 = history[ 8]; 247 tmp3 = history[ 7]; 248 tmp2 = history[ 1]; 249 tmp = history[ 0]; 250 tmp1 <<= 1; 251 tmp3 <<= 1; 252 253 history[ 0] = fxp_mul32_Q32(tmp1, window[18]); 254 history[17] = fxp_mul32_Q32(tmp1, window[35]); 255 history[ 1] = fxp_mul32_Q32(tmp3, window[19]); 256 history[16] = fxp_mul32_Q32(tmp3, window[34]); 257 258 tmp2 <<= 1; 259 tmp <<= 1; 260 history[ 7] = fxp_mul32_Q32(tmp2, window[25]); 261 history[10] = fxp_mul32_Q32(tmp2, window[28]); 262 history[ 8] = fxp_mul32_Q32(tmp, window[26]); 263 history[ 9] = fxp_mul32_Q32(tmp, window[27]); 264 265 tmp1 = history[ 6]; 266 tmp3 = history[ 5]; 267 tmp4 = history[ 4]; 268 tmp2 = history[ 3]; 269 tmp = history[ 2]; 270 271 tmp1 <<= 1; 272 tmp3 <<= 1; 273 tmp4 <<= 1; 274 275 history[ 2] = fxp_mul32_Q32(tmp1, window[20]); 276 history[15] = fxp_mul32_Q32(tmp1, window[33]); 277 history[ 3] = fxp_mul32_Q32(tmp3, window[21]); 278 history[14] = fxp_mul32_Q32(tmp3, window[32]); 279 history[ 4] = fxp_mul32_Q32(tmp4, window[22]); 280 history[13] = fxp_mul32_Q32(tmp4, window[31]); 281 tmp2 <<= 1; 282 tmp <<= 1; 283 history[ 5] = fxp_mul32_Q32(tmp2, window[23]); 284 history[12] = fxp_mul32_Q32(tmp2, window[30]); 285 history[ 6] = fxp_mul32_Q32(tmp, window[24]); 286 history[11] = fxp_mul32_Q32(tmp, window[29]); 287 } 288 289 #endif // If not assembly 290
