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: pvmp3_dct_9.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[] vector of 9 32-bit integers 39 Returns 40 int32 vec[] dct computation in-place 41 42 43 ------------------------------------------------------------------------------ 44 FUNCTION DESCRIPTION 45 46 Returns the dct of length 9 of the input vector 47 48 ------------------------------------------------------------------------------ 49 REQUIREMENTS 50 51 52 ------------------------------------------------------------------------------ 53 REFERENCES 54 55 ------------------------------------------------------------------------------ 56 PSEUDO-CODE 57 58 ------------------------------------------------------------------------------ 59 */ 60 61 #if ( !defined(PV_ARM_GCC_V5) && !defined(PV_ARM_GCC_V4) && !defined(PV_ARM_V5) && !defined(PV_ARM_V4) ) 62 /*---------------------------------------------------------------------------- 63 ; INCLUDES 64 ----------------------------------------------------------------------------*/ 65 #include "pvmp3_audio_type_defs.h" 66 #include "pv_mp3dec_fxd_op.h" 67 #include "pvmp3_mdct_18.h" 68 69 /*---------------------------------------------------------------------------- 70 ; MACROS 71 ; Define module specific macros here 72 ----------------------------------------------------------------------------*/ 73 74 75 /*---------------------------------------------------------------------------- 76 ; DEFINES 77 ; Include all pre-processor statements here. Include conditional 78 ; compile variables also. 79 ----------------------------------------------------------------------------*/ 80 #define Qfmt31(a) (int32)((a)*(0x7FFFFFFF)) 81 82 #define cos_pi_9 Qfmt31( 0.93969262078591f) 83 #define cos_2pi_9 Qfmt31( 0.76604444311898f) 84 #define cos_4pi_9 Qfmt31( 0.17364817766693f) 85 #define cos_5pi_9 Qfmt31(-0.17364817766693f) 86 #define cos_7pi_9 Qfmt31(-0.76604444311898f) 87 #define cos_8pi_9 Qfmt31(-0.93969262078591f) 88 #define cos_pi_6 Qfmt31( 0.86602540378444f) 89 #define cos_5pi_6 Qfmt31(-0.86602540378444f) 90 #define cos_5pi_18 Qfmt31( 0.64278760968654f) 91 #define cos_7pi_18 Qfmt31( 0.34202014332567f) 92 #define cos_11pi_18 Qfmt31(-0.34202014332567f) 93 #define cos_13pi_18 Qfmt31(-0.64278760968654f) 94 #define cos_17pi_18 Qfmt31(-0.98480775301221f) 95 96 /*---------------------------------------------------------------------------- 97 ; LOCAL FUNCTION DEFINITIONS 98 ; Function Prototype declaration 99 ----------------------------------------------------------------------------*/ 100 101 /*---------------------------------------------------------------------------- 102 ; LOCAL STORE/BUFFER/POINTER DEFINITIONS 103 ; Variable declaration - defined here and used outside this module 104 ----------------------------------------------------------------------------*/ 105 106 /*---------------------------------------------------------------------------- 107 ; EXTERNAL FUNCTION REFERENCES 108 ; Declare functions defined elsewhere and referenced in this module 109 ----------------------------------------------------------------------------*/ 110 111 /*---------------------------------------------------------------------------- 112 ; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES 113 ; Declare variables used in this module but defined elsewhere 114 ----------------------------------------------------------------------------*/ 115 116 /*---------------------------------------------------------------------------- 117 ; FUNCTION CODE 118 ----------------------------------------------------------------------------*/ 119 120 __attribute__((no_sanitize("integer"))) 121 void pvmp3_dct_9(int32 vec[]) 122 { 123 124 /* split input vector */ 125 126 int32 tmp0 = vec[8] + vec[0]; 127 int32 tmp8 = vec[8] - vec[0]; 128 int32 tmp1 = vec[7] + vec[1]; 129 int32 tmp7 = vec[7] - vec[1]; 130 int32 tmp2 = vec[6] + vec[2]; 131 int32 tmp6 = vec[6] - vec[2]; 132 int32 tmp3 = vec[5] + vec[3]; 133 int32 tmp5 = vec[5] - vec[3]; 134 135 vec[0] = (tmp0 + tmp2 + tmp3) + (tmp1 + vec[4]); 136 vec[6] = ((tmp0 + tmp2 + tmp3) >> 1) - (tmp1 + vec[4]); 137 vec[2] = (tmp1 >> 1) - vec[4]; 138 vec[4] = -vec[2]; 139 vec[8] = -vec[2]; 140 vec[4] = fxp_mac32_Q32(vec[4], tmp0 << 1, cos_2pi_9); 141 vec[8] = fxp_mac32_Q32(vec[8], tmp0 << 1, cos_4pi_9); 142 vec[2] = fxp_mac32_Q32(vec[2], tmp0 << 1, cos_pi_9); 143 vec[2] = fxp_mac32_Q32(vec[2], tmp2 << 1, cos_5pi_9); 144 vec[4] = fxp_mac32_Q32(vec[4], tmp2 << 1, cos_8pi_9); 145 vec[8] = fxp_mac32_Q32(vec[8], tmp2 << 1, cos_2pi_9); 146 vec[8] = fxp_mac32_Q32(vec[8], tmp3 << 1, cos_8pi_9); 147 vec[4] = fxp_mac32_Q32(vec[4], tmp3 << 1, cos_4pi_9); 148 vec[2] = fxp_mac32_Q32(vec[2], tmp3 << 1, cos_7pi_9); 149 150 vec[1] = fxp_mul32_Q32(tmp5 << 1, cos_11pi_18); 151 vec[1] = fxp_mac32_Q32(vec[1], tmp6 << 1, cos_13pi_18); 152 vec[1] = fxp_mac32_Q32(vec[1], tmp7 << 1, cos_5pi_6); 153 vec[1] = fxp_mac32_Q32(vec[1], tmp8 << 1, cos_17pi_18); 154 vec[3] = fxp_mul32_Q32((tmp5 + tmp6 - tmp8) << 1, cos_pi_6); 155 vec[5] = fxp_mul32_Q32(tmp5 << 1, cos_17pi_18); 156 vec[5] = fxp_mac32_Q32(vec[5], tmp6 << 1, cos_7pi_18); 157 vec[5] = fxp_mac32_Q32(vec[5], tmp7 << 1, cos_pi_6); 158 vec[5] = fxp_mac32_Q32(vec[5], tmp8 << 1, cos_13pi_18); 159 vec[7] = fxp_mul32_Q32(tmp5 << 1, cos_5pi_18); 160 vec[7] = fxp_mac32_Q32(vec[7], tmp6 << 1, cos_17pi_18); 161 vec[7] = fxp_mac32_Q32(vec[7], tmp7 << 1, cos_pi_6); 162 vec[7] = fxp_mac32_Q32(vec[7], tmp8 << 1, cos_11pi_18); 163 164 } 165 166 167 168 #endif // If not assembly 169
