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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.
* -------------------------------------------------------------------
*/
/*
Filename: dst8.c
------------------------------------------------------------------------------
REVISION HISTORY
Who: Date: MM/DD/YYYY
Description:
------------------------------------------------------------------------------
INPUT AND OUTPUT DEFINITIONS
Int32 x 32-bit integer input length 8
------------------------------------------------------------------------------
FUNCTION DESCRIPTION
Implement discrete sine transform of lenght 8
------------------------------------------------------------------------------
REQUIREMENTS
------------------------------------------------------------------------------
REFERENCES
------------------------------------------------------------------------------
PSEUDO-CODE
------------------------------------------------------------------------------
*/
/*----------------------------------------------------------------------------
; INCLUDES
----------------------------------------------------------------------------*/
#ifdef AAC_PLUS
#include "dst8.h"
#include "fxp_mul32.h"
/*----------------------------------------------------------------------------
; MACROS
; Define module specific macros here
----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
; DEFINES
; Include all pre-processor statements here. Include conditional
; compile variables also.
----------------------------------------------------------------------------*/
#define Qfmt15(x) (Int16)(x*((Int32)1<<15) + (x>=0?0.5F:-0.5F))
/*----------------------------------------------------------------------------
; 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
----------------------------------------------------------------------------*/
#define R_SHIFT 29
#define Qfmt(x) (Int32)(x*((Int32)1<<R_SHIFT) + (x>=0?0.5F:-0.5F))
#define Qfmt31(x) (Int32)(x*0x7FFFFFFF + (x>=0?0.5F:-0.5F))
void dst_8(Int32 vec[])
{
Int32 temp1;
Int32 temp2;
Int32 temp3;
Int32 temp4;
Int32 temp5;
Int32 temp6;
Int32 temp7;
Int32 tmp_a;
Int32 tmp_aa;
Int32 tmp_b;
Int32 tmp_bb;
Int32 tmp_c;
Int32 tmp_cc;
Int32 tmp_d;
Int32 tmp_dd;
temp1 = fxp_mul32_by_16(vec[1], Qfmt15(0.50979557910416F)); /* (1/(2*cos( phi)));*/
temp2 = fxp_mul32_by_16(vec[2], Qfmt15(0.54119610014620F)); /* (1/(2*cos(2*phi)));*/
temp3 = fxp_mul32_by_16(vec[3], Qfmt15(0.60134488693505F)); /* (1/(2*cos(3*phi)));*/
temp5 = fxp_mul32_by_16(vec[5], Qfmt15(0.89997622313642F)); /* (1/(2*cos(5*phi)));*/
temp6 = fxp_mul32_by_16(vec[6] << 1, Qfmt15(0.65328148243819F)); /* (1/(2*cos(6*phi)));*/
temp7 = vec[7] + fxp_mul32_Q31(vec[7], Qfmt31(0.56291544774152F)); /* (1/(2*cos(7*phi)));*/
/* even */
tmp_a = fxp_mul32_Q31((temp2 + temp6) << 1, Qfmt31(0.70710678118655F));
tmp_b = (temp2 - temp6) + tmp_a;
temp4 = fxp_mul32_by_16(vec[4], Qfmt15(0.70710678118655F));
vec[0] = tmp_a + temp4;
vec[1] = tmp_b + temp4;
vec[2] = tmp_b - temp4;
vec[3] = tmp_a - temp4;
/* odd */
tmp_a = fxp_mul32_by_16((temp1 + temp7) << 1, Qfmt15(0.54119610014620F)); /* (1/(2*cos(2*phi))); */
tmp_aa = (temp1 - temp7);
tmp_bb = (temp5 - temp3);
temp5 = fxp_mul32_Q29((temp5 + temp3), Qfmt(1.30656296487638F)); /* (1/(2*cos(6*phi))); */
tmp_c = fxp_mul32_by_16((tmp_a + temp5) << 1, Qfmt15(0.70710678118655F));
tmp_cc = tmp_a - temp5;
tmp_d = fxp_mac32_by_16((tmp_aa - tmp_bb) << 1, Qfmt15(0.70710678118655F), tmp_c);
tmp_dd = (tmp_aa + tmp_bb);
tmp_dd += tmp_c;
tmp_a = tmp_d + tmp_cc;
vec[5] = tmp_a - vec[2];
vec[2] += tmp_a;
temp5 = tmp_dd + tmp_cc;
vec[4] = temp5 - vec[3];
vec[3] += temp5;
vec[7] = tmp_c - vec[0];
vec[0] += tmp_c;
vec[6] = tmp_d - vec[1];
vec[1] += tmp_d;
}
#endif
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