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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: dct16.c
------------------------------------------------------------------------------
REVISION HISTORY
Who: Date: MM/DD/YYYY
Description:
------------------------------------------------------------------------------
INPUT AND OUTPUT DEFINITIONS
Int32 x 32-bit integer input length 16
Int32 flag 1 forward dct16, 0 modified dct-16
------------------------------------------------------------------------------
FUNCTION DESCRIPTION
Implement dct of lenght 16
------------------------------------------------------------------------------
REQUIREMENTS
------------------------------------------------------------------------------
REFERENCES
------------------------------------------------------------------------------
PSEUDO-CODE
------------------------------------------------------------------------------
*/
/*----------------------------------------------------------------------------
; INCLUDES
----------------------------------------------------------------------------*/
#ifdef AAC_PLUS
#include "dct16.h"
#include "fxp_mul32.h"
/*----------------------------------------------------------------------------
; MACROS
; Define module specific macros here
----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
; DEFINES
; Include all pre-processor statements here. Include conditional
; compile variables also.
----------------------------------------------------------------------------*/
#define Qfmt_31(a) (Int32)(a*0x7FFFFFFF + (a>=0?0.5F:-0.5F))
#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
----------------------------------------------------------------------------*/
void dct_16(Int32 vec[], Int flag)
{
Int32 tmp0;
Int32 tmp1;
Int32 tmp2;
Int32 tmp3;
Int32 tmp4;
Int32 tmp5;
Int32 tmp6;
Int32 tmp7;
Int32 tmp_o0;
Int32 tmp_o1;
Int32 tmp_o2;
Int32 tmp_o3;
Int32 tmp_o4;
Int32 tmp_o5;
Int32 tmp_o6;
Int32 tmp_o7;
Int32 itmp_e0;
Int32 itmp_e1;
Int32 itmp_e2;
/* split input vector */
tmp_o0 = fxp_mul32_by_16((vec[ 0] - vec[15]), Qfmt15(0.50241928618816F));
tmp0 = vec[ 0] + vec[15];
tmp_o7 = fxp_mul32_Q31((vec[ 7] - vec[ 8]) << 3, Qfmt_31(0.63764357733614F));
tmp7 = vec[ 7] + vec[ 8];
itmp_e0 = (tmp0 + tmp7);
tmp7 = fxp_mul32_by_16((tmp0 - tmp7), Qfmt15(0.50979557910416F));
tmp_o1 = fxp_mul32_by_16((vec[ 1] - vec[14]), Qfmt15(0.52249861493969F));
tmp1 = vec[ 1] + vec[14];
tmp_o6 = fxp_mul32_by_16((vec[ 6] - vec[ 9]) << 1, Qfmt15(0.86122354911916F));
tmp6 = vec[ 6] + vec[ 9];
itmp_e1 = (tmp1 + tmp6);
tmp6 = fxp_mul32_by_16((tmp1 - tmp6), Qfmt15(0.60134488693505F));
tmp_o2 = fxp_mul32_by_16((vec[ 2] - vec[13]), Qfmt15(0.56694403481636F));
tmp2 = vec[ 2] + vec[13];
tmp_o5 = fxp_mul32_by_16((vec[ 5] - vec[10]) << 1, Qfmt15(0.53033884299517F));
tmp5 = vec[ 5] + vec[10];
itmp_e2 = (tmp2 + tmp5);
tmp5 = fxp_mul32_by_16((tmp2 - tmp5), Qfmt15(0.89997622313642F));
tmp_o3 = fxp_mul32_by_16((vec[ 3] - vec[12]), Qfmt15(0.64682178335999F));
tmp3 = vec[ 3] + vec[12];
tmp_o4 = fxp_mul32_by_16((vec[ 4] - vec[11]), Qfmt15(0.78815462345125F));
tmp4 = vec[ 4] + vec[11];
tmp1 = (tmp3 + tmp4);
tmp4 = fxp_mul32_Q31((tmp3 - tmp4) << 2, Qfmt_31(0.64072886193538F));
/* split even part of tmp_e */
tmp0 = (itmp_e0 + tmp1);
tmp1 = fxp_mul32_by_16((itmp_e0 - tmp1), Qfmt15(0.54119610014620F));
tmp3 = fxp_mul32_by_16((itmp_e1 - itmp_e2) << 1, Qfmt15(0.65328148243819F));
tmp2 = (itmp_e1 + itmp_e2);
vec[ 0] = (tmp0 + tmp2) >> 1;
vec[ 8] = fxp_mul32_by_16((tmp0 - tmp2), Qfmt15(0.70710678118655F));
vec[12] = fxp_mul32_by_16((tmp1 - tmp3) << 1, Qfmt15(0.70710678118655F));
vec[ 4] = tmp1 + tmp3;
vec[ 4] += vec[12];
/* split odd part of tmp_e */
tmp1 = fxp_mul32_by_16((tmp7 - tmp4) << 1, Qfmt15(0.54119610014620F));
tmp7 += tmp4;
tmp3 = fxp_mul32_Q31((tmp6 - tmp5) << 2, Qfmt_31(0.65328148243819F));
tmp6 += tmp5;
vec[10] = fxp_mul32_by_16((tmp7 - tmp6) << 1, Qfmt15(0.70710678118655F));
vec[ 2] = tmp7 + tmp6;
vec[14] = fxp_mul32_by_16((tmp1 - tmp3) << 1, Qfmt15(0.70710678118655F));
tmp1 += tmp3 + vec[14];
vec[ 2] += tmp1;
vec[ 6] = tmp1 + vec[10];
vec[10] += vec[14];
// dct8;
tmp7 = tmp_o0 + tmp_o7;
tmp_o7 = fxp_mul32_by_16((tmp_o0 - tmp_o7) << 1, Qfmt15(0.50979557910416F));
tmp6 = tmp_o1 + tmp_o6;
tmp_o1 = fxp_mul32_by_16((tmp_o1 - tmp_o6) << 1, Qfmt15(0.60134488693505F));
tmp5 = tmp_o2 + tmp_o5;
tmp_o5 = fxp_mul32_by_16((tmp_o2 - tmp_o5) << 1, Qfmt15(0.89997622313642F));
tmp4 = tmp_o3 + tmp_o4;
tmp_o3 = fxp_mul32_Q31((tmp_o3 - tmp_o4) << 3, Qfmt_31(0.6407288619354F));
if (!flag)
{
tmp7 = -tmp7;
tmp_o7 = -tmp_o7;
tmp6 = -tmp6;
tmp_o1 = -tmp_o1;
tmp5 = -tmp5;
tmp_o5 = -tmp_o5;
tmp4 = -tmp4;
tmp_o3 = -tmp_o3;
}
// even part
tmp1 = fxp_mul32_by_16((tmp7 - tmp4) << 1, Qfmt15(0.54119610014620F));
tmp0 = tmp7 + tmp4;
tmp3 = fxp_mul32_Q31((tmp6 - tmp5) << 2, Qfmt_31(0.65328148243819F));
tmp2 = tmp6 + tmp5;
vec[ 9] = fxp_mul32_Q31((tmp0 - tmp2) << 1, Qfmt_31(0.70710678118655F));
vec[ 1] = tmp0 + tmp2;
vec[13] = fxp_mul32_Q31((tmp1 - tmp3) << 1, Qfmt_31(0.70710678118655F));
vec[ 5] = tmp1 + tmp3 + vec[13];
// odd part
tmp0 = tmp_o7 + tmp_o3;
tmp1 = fxp_mul32_by_16((tmp_o7 - tmp_o3) << 1, Qfmt15(0.54119610014620F));
tmp2 = tmp_o1 + tmp_o5;
tmp3 = fxp_mul32_Q31((tmp_o1 - tmp_o5) << 2, Qfmt_31(0.65328148243819F));
vec[11] = fxp_mul32_Q31((tmp0 - tmp2) << 1, Qfmt_31(0.70710678118655F));
vec[ 3] = tmp0 + tmp2;
vec[15] = fxp_mul32_Q31((tmp1 - tmp3) << 1, Qfmt_31(0.70710678118655F));
vec[ 7] = tmp1 + tmp3 + vec[15];
vec[ 3] += vec[ 7];
vec[ 7] += vec[11];
vec[11] += vec[15];
vec[ 1] += vec[ 3];
vec[ 3] += vec[ 5];
vec[ 5] += vec[ 7];
vec[ 7] += vec[ 9];
vec[ 9] += vec[11];
vec[11] += vec[13];
vec[13] += vec[15];
}
#endif
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