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 Filename: dct16.c 20 21 ------------------------------------------------------------------------------ 22 REVISION HISTORY 23 24 25 Who: Date: MM/DD/YYYY 26 Description: 27 28 ------------------------------------------------------------------------------ 29 INPUT AND OUTPUT DEFINITIONS 30 31 Int32 x 32-bit integer input length 16 32 33 Int32 flag 1 forward dct16, 0 modified dct-16 34 35 ------------------------------------------------------------------------------ 36 FUNCTION DESCRIPTION 37 38 Implement dct of lenght 16 39 40 ------------------------------------------------------------------------------ 41 REQUIREMENTS 42 43 44 ------------------------------------------------------------------------------ 45 REFERENCES 46 47 ------------------------------------------------------------------------------ 48 PSEUDO-CODE 49 50 ------------------------------------------------------------------------------ 51 */ 52 53 54 /*---------------------------------------------------------------------------- 55 ; INCLUDES 56 ----------------------------------------------------------------------------*/ 57 58 #ifdef AAC_PLUS 59 60 #include "dct16.h" 61 #include "fxp_mul32.h" 62 63 /*---------------------------------------------------------------------------- 64 ; MACROS 65 ; Define module specific macros here 66 ----------------------------------------------------------------------------*/ 67 68 69 /*---------------------------------------------------------------------------- 70 ; DEFINES 71 ; Include all pre-processor statements here. Include conditional 72 ; compile variables also. 73 ----------------------------------------------------------------------------*/ 74 75 #define Qfmt_31(a) (Int32)(a*0x7FFFFFFF + (a>=0?0.5F:-0.5F)) 76 77 #define Qfmt15(x) (Int16)(x*((Int32)1<<15) + (x>=0?0.5F:-0.5F)) 78 79 /*---------------------------------------------------------------------------- 80 ; LOCAL FUNCTION DEFINITIONS 81 ; Function Prototype declaration 82 ----------------------------------------------------------------------------*/ 83 84 /*---------------------------------------------------------------------------- 85 ; LOCAL STORE/BUFFER/POINTER DEFINITIONS 86 ; Variable declaration - defined here and used outside this module 87 ----------------------------------------------------------------------------*/ 88 89 /*---------------------------------------------------------------------------- 90 ; EXTERNAL FUNCTION REFERENCES 91 ; Declare functions defined elsewhere and referenced in this module 92 ----------------------------------------------------------------------------*/ 93 94 /*---------------------------------------------------------------------------- 95 ; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES 96 ; Declare variables used in this module but defined elsewhere 97 ----------------------------------------------------------------------------*/ 98 99 /*---------------------------------------------------------------------------- 100 ; FUNCTION CODE 101 ----------------------------------------------------------------------------*/ 102 103 104 void dct_16(Int32 vec[], Int flag) 105 { 106 Int32 tmp0; 107 Int32 tmp1; 108 Int32 tmp2; 109 Int32 tmp3; 110 Int32 tmp4; 111 Int32 tmp5; 112 Int32 tmp6; 113 Int32 tmp7; 114 Int32 tmp_o0; 115 Int32 tmp_o1; 116 Int32 tmp_o2; 117 Int32 tmp_o3; 118 Int32 tmp_o4; 119 Int32 tmp_o5; 120 Int32 tmp_o6; 121 Int32 tmp_o7; 122 Int32 itmp_e0; 123 Int32 itmp_e1; 124 Int32 itmp_e2; 125 126 /* split input vector */ 127 128 129 tmp_o0 = fxp_mul32_by_16((vec[ 0] - vec[15]), Qfmt15(0.50241928618816F)); 130 tmp0 = vec[ 0] + vec[15]; 131 132 tmp_o7 = fxp_mul32_Q31((vec[ 7] - vec[ 8]) << 3, Qfmt_31(0.63764357733614F)); 133 tmp7 = vec[ 7] + vec[ 8]; 134 135 itmp_e0 = (tmp0 + tmp7); 136 tmp7 = fxp_mul32_by_16((tmp0 - tmp7), Qfmt15(0.50979557910416F)); 137 138 tmp_o1 = fxp_mul32_by_16((vec[ 1] - vec[14]), Qfmt15(0.52249861493969F)); 139 tmp1 = vec[ 1] + vec[14]; 140 tmp_o6 = fxp_mul32_by_16((vec[ 6] - vec[ 9]) << 1, Qfmt15(0.86122354911916F)); 141 tmp6 = vec[ 6] + vec[ 9]; 142 143 itmp_e1 = (tmp1 + tmp6); 144 tmp6 = fxp_mul32_by_16((tmp1 - tmp6), Qfmt15(0.60134488693505F)); 145 146 tmp_o2 = fxp_mul32_by_16((vec[ 2] - vec[13]), Qfmt15(0.56694403481636F)); 147 tmp2 = vec[ 2] + vec[13]; 148 tmp_o5 = fxp_mul32_by_16((vec[ 5] - vec[10]) << 1, Qfmt15(0.53033884299517F)); 149 tmp5 = vec[ 5] + vec[10]; 150 151 itmp_e2 = (tmp2 + tmp5); 152 tmp5 = fxp_mul32_by_16((tmp2 - tmp5), Qfmt15(0.89997622313642F)); 153 154 tmp_o3 = fxp_mul32_by_16((vec[ 3] - vec[12]), Qfmt15(0.64682178335999F)); 155 tmp3 = vec[ 3] + vec[12]; 156 tmp_o4 = fxp_mul32_by_16((vec[ 4] - vec[11]), Qfmt15(0.78815462345125F)); 157 tmp4 = vec[ 4] + vec[11]; 158 159 tmp1 = (tmp3 + tmp4); 160 tmp4 = fxp_mul32_Q31((tmp3 - tmp4) << 2, Qfmt_31(0.64072886193538F)); 161 162 /* split even part of tmp_e */ 163 164 tmp0 = (itmp_e0 + tmp1); 165 tmp1 = fxp_mul32_by_16((itmp_e0 - tmp1), Qfmt15(0.54119610014620F)); 166 167 168 tmp3 = fxp_mul32_by_16((itmp_e1 - itmp_e2) << 1, Qfmt15(0.65328148243819F)); 169 tmp2 = (itmp_e1 + itmp_e2); 170 171 vec[ 0] = (tmp0 + tmp2) >> 1; 172 vec[ 8] = fxp_mul32_by_16((tmp0 - tmp2), Qfmt15(0.70710678118655F)); 173 vec[12] = fxp_mul32_by_16((tmp1 - tmp3) << 1, Qfmt15(0.70710678118655F)); 174 vec[ 4] = tmp1 + tmp3; 175 vec[ 4] += vec[12]; 176 177 /* split odd part of tmp_e */ 178 179 tmp1 = fxp_mul32_by_16((tmp7 - tmp4) << 1, Qfmt15(0.54119610014620F)); 180 tmp7 += tmp4; 181 tmp3 = fxp_mul32_Q31((tmp6 - tmp5) << 2, Qfmt_31(0.65328148243819F)); 182 183 tmp6 += tmp5; 184 185 vec[10] = fxp_mul32_by_16((tmp7 - tmp6) << 1, Qfmt15(0.70710678118655F)); 186 vec[ 2] = tmp7 + tmp6; 187 vec[14] = fxp_mul32_by_16((tmp1 - tmp3) << 1, Qfmt15(0.70710678118655F)); 188 189 tmp1 += tmp3 + vec[14]; 190 vec[ 2] += tmp1; 191 vec[ 6] = tmp1 + vec[10]; 192 193 vec[10] += vec[14]; 194 195 196 // dct8; 197 198 tmp7 = tmp_o0 + tmp_o7; 199 tmp_o7 = fxp_mul32_by_16((tmp_o0 - tmp_o7) << 1, Qfmt15(0.50979557910416F)); 200 201 tmp6 = tmp_o1 + tmp_o6; 202 tmp_o1 = fxp_mul32_by_16((tmp_o1 - tmp_o6) << 1, Qfmt15(0.60134488693505F)); 203 204 tmp5 = tmp_o2 + tmp_o5; 205 tmp_o5 = fxp_mul32_by_16((tmp_o2 - tmp_o5) << 1, Qfmt15(0.89997622313642F)); 206 207 tmp4 = tmp_o3 + tmp_o4; 208 209 tmp_o3 = fxp_mul32_Q31((tmp_o3 - tmp_o4) << 3, Qfmt_31(0.6407288619354F)); 210 211 if (!flag) 212 { 213 tmp7 = -tmp7; 214 tmp_o7 = -tmp_o7; 215 tmp6 = -tmp6; 216 tmp_o1 = -tmp_o1; 217 tmp5 = -tmp5; 218 tmp_o5 = -tmp_o5; 219 tmp4 = -tmp4; 220 tmp_o3 = -tmp_o3; 221 } 222 223 // even part 224 225 tmp1 = fxp_mul32_by_16((tmp7 - tmp4) << 1, Qfmt15(0.54119610014620F)); 226 tmp0 = tmp7 + tmp4; 227 tmp3 = fxp_mul32_Q31((tmp6 - tmp5) << 2, Qfmt_31(0.65328148243819F)); 228 tmp2 = tmp6 + tmp5; 229 230 vec[ 9] = fxp_mul32_Q31((tmp0 - tmp2) << 1, Qfmt_31(0.70710678118655F)); 231 vec[ 1] = tmp0 + tmp2; 232 vec[13] = fxp_mul32_Q31((tmp1 - tmp3) << 1, Qfmt_31(0.70710678118655F)); 233 234 vec[ 5] = tmp1 + tmp3 + vec[13]; 235 236 // odd part 237 238 tmp0 = tmp_o7 + tmp_o3; 239 tmp1 = fxp_mul32_by_16((tmp_o7 - tmp_o3) << 1, Qfmt15(0.54119610014620F)); 240 tmp2 = tmp_o1 + tmp_o5; 241 tmp3 = fxp_mul32_Q31((tmp_o1 - tmp_o5) << 2, Qfmt_31(0.65328148243819F)); 242 243 vec[11] = fxp_mul32_Q31((tmp0 - tmp2) << 1, Qfmt_31(0.70710678118655F)); 244 vec[ 3] = tmp0 + tmp2; 245 vec[15] = fxp_mul32_Q31((tmp1 - tmp3) << 1, Qfmt_31(0.70710678118655F)); 246 vec[ 7] = tmp1 + tmp3 + vec[15]; 247 248 249 vec[ 3] += vec[ 7]; 250 vec[ 7] += vec[11]; 251 vec[11] += vec[15]; 252 253 vec[ 1] += vec[ 3]; 254 vec[ 3] += vec[ 5]; 255 vec[ 5] += vec[ 7]; 256 vec[ 7] += vec[ 9]; 257 vec[ 9] += vec[11]; 258 vec[11] += vec[13]; 259 vec[13] += vec[15]; 260 261 262 } 263 264 265 #endif 266 267
