/* ------------------------------------------------------------------ * Copyright (C) 1998-2009 PacketVideo * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either * express or implied. * See the License for the specific language governing permissions * and limitations under the License. * ------------------------------------------------------------------- */ /* ------------------------------------------------------------------------------ PacketVideo Corp. MP3 Decoder Library Filename: pvmp3_dct_9.cpp Date: 09/21/2007 ------------------------------------------------------------------------------ REVISION HISTORY Description: ------------------------------------------------------------------------------ INPUT AND OUTPUT DEFINITIONS Input int32 vec[] vector of 9 32-bit integers Returns int32 vec[] dct computation in-place ------------------------------------------------------------------------------ FUNCTION DESCRIPTION Returns the dct of length 9 of the input vector ------------------------------------------------------------------------------ REQUIREMENTS ------------------------------------------------------------------------------ REFERENCES ------------------------------------------------------------------------------ PSEUDO-CODE ------------------------------------------------------------------------------ */ #if ( !defined(PV_ARM_GCC_V5) && !defined(PV_ARM_GCC_V4) && !defined(PV_ARM_V5) && !defined(PV_ARM_V4) ) /*---------------------------------------------------------------------------- ; INCLUDES ----------------------------------------------------------------------------*/ #include "pvmp3_audio_type_defs.h" #include "pv_mp3dec_fxd_op.h" #include "pvmp3_mdct_18.h" /*---------------------------------------------------------------------------- ; MACROS ; Define module specific macros here ----------------------------------------------------------------------------*/ /*---------------------------------------------------------------------------- ; DEFINES ; Include all pre-processor statements here. Include conditional ; compile variables also. ----------------------------------------------------------------------------*/ #define Qfmt31(a) (int32)(a*(0x7FFFFFFF)) #define cos_pi_9 Qfmt31( 0.93969262078591f) #define cos_2pi_9 Qfmt31( 0.76604444311898f) #define cos_4pi_9 Qfmt31( 0.17364817766693f) #define cos_5pi_9 Qfmt31(-0.17364817766693f) #define cos_7pi_9 Qfmt31(-0.76604444311898f) #define cos_8pi_9 Qfmt31(-0.93969262078591f) #define cos_pi_6 Qfmt31( 0.86602540378444f) #define cos_5pi_6 Qfmt31(-0.86602540378444f) #define cos_5pi_18 Qfmt31( 0.64278760968654f) #define cos_7pi_18 Qfmt31( 0.34202014332567f) #define cos_11pi_18 Qfmt31(-0.34202014332567f) #define cos_13pi_18 Qfmt31(-0.64278760968654f) #define cos_17pi_18 Qfmt31(-0.98480775301221f) /*---------------------------------------------------------------------------- ; LOCAL FUNCTION DEFINITIONS ; Function Prototype declaration ----------------------------------------------------------------------------*/ /*---------------------------------------------------------------------------- ; LOCAL STORE/BUFFER/POINTER DEFINITIONS ; Variable declaration - defined here and used outside this module ----------------------------------------------------------------------------*/ /*---------------------------------------------------------------------------- ; EXTERNAL FUNCTION REFERENCES ; Declare functions defined elsewhere and referenced in this module ----------------------------------------------------------------------------*/ /*---------------------------------------------------------------------------- ; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES ; Declare variables used in this module but defined elsewhere ----------------------------------------------------------------------------*/ /*---------------------------------------------------------------------------- ; FUNCTION CODE ----------------------------------------------------------------------------*/ void pvmp3_dct_9(int32 vec[]) { /* split input vector */ int32 tmp0 = vec[8] + vec[0]; int32 tmp8 = vec[8] - vec[0]; int32 tmp1 = vec[7] + vec[1]; int32 tmp7 = vec[7] - vec[1]; int32 tmp2 = vec[6] + vec[2]; int32 tmp6 = vec[6] - vec[2]; int32 tmp3 = vec[5] + vec[3]; int32 tmp5 = vec[5] - vec[3]; vec[0] = (tmp0 + tmp2 + tmp3) + (tmp1 + vec[4]); vec[6] = ((tmp0 + tmp2 + tmp3) >> 1) - (tmp1 + vec[4]); vec[2] = (tmp1 >> 1) - vec[4]; vec[4] = -vec[2]; vec[8] = -vec[2]; vec[4] = fxp_mac32_Q32(vec[4], tmp0 << 1, cos_2pi_9); vec[8] = fxp_mac32_Q32(vec[8], tmp0 << 1, cos_4pi_9); vec[2] = fxp_mac32_Q32(vec[2], tmp0 << 1, cos_pi_9); vec[2] = fxp_mac32_Q32(vec[2], tmp2 << 1, cos_5pi_9); vec[4] = fxp_mac32_Q32(vec[4], tmp2 << 1, cos_8pi_9); vec[8] = fxp_mac32_Q32(vec[8], tmp2 << 1, cos_2pi_9); vec[8] = fxp_mac32_Q32(vec[8], tmp3 << 1, cos_8pi_9); vec[4] = fxp_mac32_Q32(vec[4], tmp3 << 1, cos_4pi_9); vec[2] = fxp_mac32_Q32(vec[2], tmp3 << 1, cos_7pi_9); vec[1] = fxp_mul32_Q32(tmp5 << 1, cos_11pi_18); vec[1] = fxp_mac32_Q32(vec[1], tmp6 << 1, cos_13pi_18); vec[1] = fxp_mac32_Q32(vec[1], tmp7 << 1, cos_5pi_6); vec[1] = fxp_mac32_Q32(vec[1], tmp8 << 1, cos_17pi_18); vec[3] = fxp_mul32_Q32((tmp5 + tmp6 - tmp8) << 1, cos_pi_6); vec[5] = fxp_mul32_Q32(tmp5 << 1, cos_17pi_18); vec[5] = fxp_mac32_Q32(vec[5], tmp6 << 1, cos_7pi_18); vec[5] = fxp_mac32_Q32(vec[5], tmp7 << 1, cos_pi_6); vec[5] = fxp_mac32_Q32(vec[5], tmp8 << 1, cos_13pi_18); vec[7] = fxp_mul32_Q32(tmp5 << 1, cos_5pi_18); vec[7] = fxp_mac32_Q32(vec[7], tmp6 << 1, cos_17pi_18); vec[7] = fxp_mac32_Q32(vec[7], tmp7 << 1, cos_pi_6); vec[7] = fxp_mac32_Q32(vec[7], tmp8 << 1, cos_11pi_18); } #endif // If not assembly