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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_polyphase_filter_window.cpp
Date: 09/21/2007
------------------------------------------------------------------------------
REVISION HISTORY
Description:
------------------------------------------------------------------------------
INPUT AND OUTPUT DEFINITIONS
Input
int32 *synth_buffer, synthesis input buffer
int16 *outPcm, generated output ( 32 values)
int32 numChannels number of channels
Returns
int16 *outPcm
------------------------------------------------------------------------------
FUNCTION DESCRIPTION
apply polyphase filter window
Input 32 subband samples
Calculate 64 values
------------------------------------------------------------------------------
REQUIREMENTS
------------------------------------------------------------------------------
REFERENCES
[1] ISO MPEG Audio Subgroup Software Simulation Group (1996)
ISO 13818-3 MPEG-2 Audio Decoder - Lower Sampling Frequency Extension
------------------------------------------------------------------------------
PSEUDO-CODE
------------------------------------------------------------------------------
*/
#if ( !defined(PV_ARM_GCC_V5) && !defined(PV_ARM_GCC_V4) && !defined(PV_ARM_V5) && !defined(PV_ARM_V4) )
/*----------------------------------------------------------------------------
; INCLUDES
----------------------------------------------------------------------------*/
#include "pvmp3_polyphase_filter_window.h"
#include "pv_mp3dec_fxd_op.h"
#include "pvmp3_dec_defs.h"
#include "pvmp3_tables.h"
/*----------------------------------------------------------------------------
; MACROS
; Define module1 specific macros here
----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
; DEFINES
; Include all pre-processor statements here. Include conditional
; compile variables also.
----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
; LOCAL FUNCTION DEFINITIONS
; Function Prototype declaration
----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
; LOCAL STORE/BUFFER/POINTER DEFINITIONS
; Variable declaration - defined here and used outside this module1
----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
; EXTERNAL FUNCTION REFERENCES
; Declare functions defined elsewhere and referenced in this module_x
----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES
; Declare variables used in this module_x but defined elsewhere
----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
; FUNCTION CODE
----------------------------------------------------------------------------*/
void pvmp3_polyphase_filter_window(int32 *synth_buffer,
int16 *outPcm,
int32 numChannels)
{
int32 sum1;
int32 sum2;
const int32 *winPtr = pqmfSynthWin;
int32 i;
for (int16 j = 1; j < SUBBANDS_NUMBER / 2; j++)
{
sum1 = 0x00000020;
sum2 = 0x00000020;
for (i = (SUBBANDS_NUMBER >> 1);
i < HAN_SIZE + (SUBBANDS_NUMBER >> 1);
i += SUBBANDS_NUMBER << 4)
{
int32 *pt_1 = &synth_buffer[ i+j];
int32 *pt_2 = &synth_buffer[ i-j];
int32 temp1 = pt_1[ 0];
int32 temp3 = pt_2[ SUBBANDS_NUMBER*15 ];
int32 temp2 = pt_2[ SUBBANDS_NUMBER* 1 ];
int32 temp4 = pt_1[ SUBBANDS_NUMBER*14 ];
sum1 = fxp_mac32_Q32(sum1, temp1, winPtr[ 0]);
sum2 = fxp_mac32_Q32(sum2, temp3, winPtr[ 0]);
sum2 = fxp_mac32_Q32(sum2, temp1, winPtr[ 1]);
sum1 = fxp_msb32_Q32(sum1, temp3, winPtr[ 1]);
sum1 = fxp_mac32_Q32(sum1, temp2, winPtr[ 2]);
sum2 = fxp_msb32_Q32(sum2, temp4, winPtr[ 2]);
sum2 = fxp_mac32_Q32(sum2, temp2, winPtr[ 3]);
sum1 = fxp_mac32_Q32(sum1, temp4, winPtr[ 3]);
temp1 = pt_1[ SUBBANDS_NUMBER* 2];
temp3 = pt_2[ SUBBANDS_NUMBER*13];
temp2 = pt_2[ SUBBANDS_NUMBER* 3];
temp4 = pt_1[ SUBBANDS_NUMBER*12];
sum1 = fxp_mac32_Q32(sum1, temp1, winPtr[ 4]);
sum2 = fxp_mac32_Q32(sum2, temp3, winPtr[ 4]);
sum2 = fxp_mac32_Q32(sum2, temp1, winPtr[ 5]);
sum1 = fxp_msb32_Q32(sum1, temp3, winPtr[ 5]);
sum1 = fxp_mac32_Q32(sum1, temp2, winPtr[ 6]);
sum2 = fxp_msb32_Q32(sum2, temp4, winPtr[ 6]);
sum2 = fxp_mac32_Q32(sum2, temp2, winPtr[ 7]);
sum1 = fxp_mac32_Q32(sum1, temp4, winPtr[ 7]);
temp1 = pt_1[ SUBBANDS_NUMBER* 4 ];
temp3 = pt_2[ SUBBANDS_NUMBER*11 ];
temp2 = pt_2[ SUBBANDS_NUMBER* 5 ];
temp4 = pt_1[ SUBBANDS_NUMBER*10 ];
sum1 = fxp_mac32_Q32(sum1, temp1, winPtr[ 8]);
sum2 = fxp_mac32_Q32(sum2, temp3, winPtr[ 8]);
sum2 = fxp_mac32_Q32(sum2, temp1, winPtr[ 9]);
sum1 = fxp_msb32_Q32(sum1, temp3, winPtr[ 9]);
sum1 = fxp_mac32_Q32(sum1, temp2, winPtr[10]);
sum2 = fxp_msb32_Q32(sum2, temp4, winPtr[10]);
sum2 = fxp_mac32_Q32(sum2, temp2, winPtr[11]);
sum1 = fxp_mac32_Q32(sum1, temp4, winPtr[11]);
temp1 = pt_1[ SUBBANDS_NUMBER*6 ];
temp3 = pt_2[ SUBBANDS_NUMBER*9 ];
temp2 = pt_2[ SUBBANDS_NUMBER*7 ];
temp4 = pt_1[ SUBBANDS_NUMBER*8 ];
sum1 = fxp_mac32_Q32(sum1, temp1, winPtr[12]);
sum2 = fxp_mac32_Q32(sum2, temp3, winPtr[12]);
sum2 = fxp_mac32_Q32(sum2, temp1, winPtr[13]);
sum1 = fxp_msb32_Q32(sum1, temp3, winPtr[13]);
sum1 = fxp_mac32_Q32(sum1, temp2, winPtr[14]);
sum2 = fxp_msb32_Q32(sum2, temp4, winPtr[14]);
sum2 = fxp_mac32_Q32(sum2, temp2, winPtr[15]);
sum1 = fxp_mac32_Q32(sum1, temp4, winPtr[15]);
winPtr += 16;
}
int32 k = j << (numChannels - 1);
outPcm[k] = saturate16(sum1 >> 6);
outPcm[(numChannels<<5) - k] = saturate16(sum2 >> 6);
}
sum1 = 0x00000020;
sum2 = 0x00000020;
for (i = 16; i < HAN_SIZE + 16; i += (SUBBANDS_NUMBER << 2))
{
int32 *pt_synth = &synth_buffer[i];
int32 temp1 = pt_synth[ 0 ];
int32 temp2 = pt_synth[ SUBBANDS_NUMBER ];
int32 temp3 = pt_synth[ SUBBANDS_NUMBER/2];
sum1 = fxp_mac32_Q32(sum1, temp1, winPtr[0]) ;
sum1 = fxp_mac32_Q32(sum1, temp2, winPtr[1]) ;
sum2 = fxp_mac32_Q32(sum2, temp3, winPtr[2]) ;
temp1 = pt_synth[ SUBBANDS_NUMBER<<1 ];
temp2 = pt_synth[ 3*SUBBANDS_NUMBER ];
temp3 = pt_synth[ SUBBANDS_NUMBER*5/2];
sum1 = fxp_mac32_Q32(sum1, temp1, winPtr[3]) ;
sum1 = fxp_mac32_Q32(sum1, temp2, winPtr[4]) ;
sum2 = fxp_mac32_Q32(sum2, temp3, winPtr[5]) ;
winPtr += 6;
}
outPcm[0] = saturate16(sum1 >> 6);
outPcm[(SUBBANDS_NUMBER/2)<<(numChannels-1)] = saturate16(sum2 >> 6);
}
#endif // If not assembly
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