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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: dst32.c
------------------------------------------------------------------------------
REVISION HISTORY
Who: Date: MM/DD/YYYY
Description:
------------------------------------------------------------------------------
INPUT AND OUTPUT DEFINITIONS
Int32 x 32-bit integer input length 32
------------------------------------------------------------------------------
FUNCTION DESCRIPTION
Implement discrete sine transform of lenght 32
------------------------------------------------------------------------------
REQUIREMENTS
------------------------------------------------------------------------------
REFERENCES
------------------------------------------------------------------------------
PSEUDO-CODE
------------------------------------------------------------------------------
*/
/*----------------------------------------------------------------------------
; INCLUDES
----------------------------------------------------------------------------*/
#ifdef AAC_PLUS
#include "dst32.h"
#include "dst16.h"
#include "fxp_mul32.h"
/*----------------------------------------------------------------------------
; MACROS
; Define module specific macros here
----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
; DEFINES
; Include all pre-processor statements here. Include conditional
; compile variables also.
----------------------------------------------------------------------------*/
#define R_SHIFT1 29
#define Qfmt29(x) (Int32)(x*((Int32)1<<R_SHIFT1) + (x>=0?0.5F:-0.5F))
#define Qfmt31(a) (Int32)(a*0x7FFFFFFF + (a>=0?0.5F:-0.5F))
const Int32 CosTable_16[14] =
{
Qfmt31(0.50060299823520F), Qfmt31(0.50547095989754F),
Qfmt31(0.51544730992262F), Qfmt31(0.53104259108978F),
Qfmt31(0.55310389603444F), Qfmt31(0.58293496820613F),
Qfmt31(0.62250412303566F), Qfmt31(0.67480834145501F),
Qfmt31(0.74453627100230F), Qfmt31(0.83934964541553F),
Qfmt29(0.97256823786196F), Qfmt29(1.16943993343288F),
Qfmt29(1.48416461631417F), Qfmt29(2.05778100995341F)
};
/*----------------------------------------------------------------------------
; 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 dst_32(Int32 vec[], Int32 scratch_mem[]) /* scratch_mem size 32 */
{
Int32 *temp_even = scratch_mem;
Int32 i;
const Int32 *pt_cos = &CosTable_16[13];
Int32 tmp0 = vec[31] >> 1;
Int32 tmp1, tmp2;
Int32 *pt_even = temp_even;
Int32 *pt_odd = vec;
Int32 *pt_vec = vec;
Int32 *pt_vecN_1 = vec;
Int32 tmp3;
tmp1 = 0;
for (i = 5; i != 0; i--)
{
*(pt_even++) = *(pt_vec++);
tmp2 = *(pt_vec++);
*(pt_even++) = *(pt_vec++);
tmp3 = *(pt_vec++);
*(pt_even++) = *(pt_vec++);
*(pt_odd++) = tmp2 + tmp1;
*(pt_odd++) = tmp3 + tmp2;
tmp1 = *(pt_vec++);
*(pt_odd++) = tmp1 + tmp3;
}
*(pt_even) = *(pt_vec++);
*(pt_odd) = *(pt_vec) + tmp1;
dst_16(temp_even, &scratch_mem[16]);
dst_16(vec, &scratch_mem[24]);
pt_vecN_1 = &vec[16];
tmp1 = temp_even[15];
tmp3 = fxp_mul32_Q31((vec[15] - tmp0) << 3, Qfmt31(0.63687550772175F)) << 2;
tmp2 = temp_even[14];
*(pt_vecN_1++) = tmp3 - tmp1;
vec[15] = tmp3 + tmp1;
tmp1 = temp_even[13];
tmp3 = fxp_mul32_Q31((vec[14] + tmp0) << 3, Qfmt31(0.85190210461718F));
*(pt_vecN_1++) = tmp3 - tmp2;
vec[14] = tmp3 + tmp2;
pt_even = &temp_even[12];
pt_vec = &vec[13];
for (i = 2; i != 0; i--)
{
tmp3 = fxp_mul32_Q29((*(pt_vec) - tmp0), *(pt_cos--));
tmp2 = *(pt_even--);
*(pt_vec--) = tmp3 + tmp1;
*(pt_vecN_1++) = tmp3 - tmp1;
tmp3 = fxp_mul32_Q29((*(pt_vec) + tmp0), *(pt_cos--));
tmp1 = *(pt_even--);
*(pt_vec--) = tmp3 + tmp2;
*(pt_vecN_1++) = tmp3 - tmp2;
}
for (i = 5; i != 0; i--)
{
tmp3 = fxp_mul32_Q31((*(pt_vec) - tmp0) << 1, *(pt_cos--));
tmp2 = *(pt_even--);
*(pt_vec--) = tmp3 + tmp1;
*(pt_vecN_1++) = tmp3 - tmp1;
tmp3 = fxp_mul32_Q31((*(pt_vec) + tmp0) << 1, *(pt_cos--));
tmp1 = *(pt_even--);
*(pt_vec--) = tmp3 + tmp2;
*(pt_vecN_1++) = tmp3 - tmp2;
}
}
#endif
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