pvmp3_dct_9.cpp
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/* ------------------------------------------------------------------
* 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