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