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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.
* -------------------------------------------------------------------
*/
/*
Pathname: ./src/fft_rx4_tables_fxp.c
Funtions:
------------------------------------------------------------------------------
REVISION HISTORY
Description: Reduce the accuracy of w_256rx4 and w_512rx2 to Q10 format.
Try to to pack sin and cos into one 32-bit number to reduce the
memory access, but doesn't help in speed, so commented out for now.
Description:
(1) Reduced precision of w_64rx4 from Q15 to Q12.
(2) Increased precision of w_512rx2 from Q10 to Q13, Both changes
increase overall decoder precision
Description:
(1) per code review comment, added description for table generation
(2) modified definition of w_64rx4 from Int to Int16
Who: Date:
Description:
----------------------------------------------------------------------------
MODULE DESCRIPTION
Table generation
n = 256 or 64;
M = precision; 2^10, 2^12, 2^13
for j=1; j<log4(n); j *= 4
for i=0; i<n/4; i +=j
phi_1 = 2*pi*i/n;
phi_2 = 4*pi*i/n;
phi_3 = 6*pi*i/n;
M*[cos(phi_1) sin(phi_1) cos(phi_2) sin(phi_2) cos(phi_3) sin(phi_4)];
end
end
------------------------------------------------------------------------------
*/
/*----------------------------------------------------------------------------
; INCLUDES
----------------------------------------------------------------------------*/
#include "fft_rx4.h"
/*----------------------------------------------------------------------------
; MACROS
; Define module specific macros here
----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
; DEFINES
; Include all pre-processor statements here. Include conditional
; compile variables also.
----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
; LOCAL FUNCTION DEFINITIONS
; Function Prototype declaration
----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
; LOCAL VARIABLE DEFINITIONS
; Variable declaration - defined here and used outside this module
----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
; EXTERNAL FUNCTION REFERENCES
; Declare functions defined elsewhere and referenced in this module
----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
; EXTERNAL VARIABLES REFERENCES
; Declare variables used in this module but defined elsewhere
----------------------------------------------------------------------------*/
/*
------------------------------------------------------------------------------
Forward FFT radix-4 tables
------------------------------------------------------------------------------
*/
const Int32 W_64rx4[60] = /* 2 Q15 */
{
0x7F610C8C, 0x7D8918F9, 0x7A7C2528,
0x7D8918F9, 0x764130FB, 0x6A6D471C,
0x7A7C2528, 0x6A6D471C, 0x513362F1,
0x764130FB, 0x5A825A82, 0x30FB7641,
0x70E23C56, 0x471C6A6D, 0x0C8C7F61,
0x6A6D471C, 0x30FB7641, 0xE7057D89,
0x62F15133, 0x18F97D89, 0xC3A870E2,
0x5A825A82, 0x00007FFF, 0xA57C5A82,
0x513362F1, 0xE7057D89, 0x8F1C3C56,
0x471C6A6D, 0xCF037641, 0x827518F9,
0x3C5670E2, 0xB8E26A6D, 0x809DF372,
0x30FB7641, 0xA57C5A82, 0x89BDCF03,
0x25287A7C, 0x9591471C, 0x9D0DAECB,
0x18F97D89, 0x89BD30FB, 0xB8E29591,
0x0C8C7F61, 0x827518F9, 0xDAD68582,
0x764130FB, 0x5A825A82, 0x30FB7641,
0x5A825A82, 0x00007FFF, 0xA57C5A82,
0x30FB7641, 0xA57C5A82, 0x89BDCF03,
};
const Int32 W_256rx4[495] = /* 2 Q15 */
{
0x7FF50324, 0x7FD80648, 0x7FA6096A,
0x7FD80648, 0x7F610C8C, 0x7E9C12C8,
0x7FA6096A, 0x7E9C12C8, 0x7CE31C0B,
0x7F610C8C, 0x7D8918F9, 0x7A7C2528,
0x7F090FAB, 0x7C291F1A, 0x776B2E11,
0x7E9C12C8, 0x7A7C2528, 0x73B536BA,
0x7E1D15E2, 0x78842B1F, 0x6F5E3F17,
0x7D8918F9, 0x764130FB, 0x6A6D471C,
0x7CE31C0B, 0x73B536BA, 0x64E84EBF,
0x7C291F1A, 0x70E23C56, 0x5ED755F5,
0x7B5C2223, 0x6DC941CE, 0x58425CB3,
0x7A7C2528, 0x6A6D471C, 0x513362F1,
0x79892826, 0x66CF4C3F, 0x49B468A6,
0x78842B1F, 0x62F15133, 0x41CE6DC9,
0x776B2E11, 0x5ED755F5, 0x398C7254,
0x764130FB, 0x5A825A82, 0x30FB7641,
0x750433DF, 0x55F55ED7, 0x28267989,
0x73B536BA, 0x513362F1, 0x1F1A7C29,
0x7254398C, 0x4C3F66CF, 0x15E27E1D,
0x70E23C56, 0x471C6A6D, 0x0C8C7F61,
0x6F5E3F17, 0x41CE6DC9, 0x03247FF5,
0x6DC941CE, 0x3C5670E2, 0xF9B67FD8,
0x6C23447A, 0x36BA73B5, 0xF0537F09,
0x6A6D471C, 0x30FB7641, 0xE7057D89,
0x68A649B4, 0x2B1F7884, 0xDDDB7B5C,
0x66CF4C3F, 0x25287A7C, 0xD4DF7884,
0x64E84EBF, 0x1F1A7C29, 0xCC1F7504,
0x62F15133, 0x18F97D89, 0xC3A870E2,
0x60EB539B, 0x12C87E9C, 0xBB846C23,
0x5ED755F5, 0x0C8C7F61, 0xB3BF66CF,
0x5CB35842, 0x06487FD8, 0xAC6360EB,
0x5A825A82, 0x00007FFF, 0xA57C5A82,
0x58425CB3, 0xF9B67FD8, 0x9F13539B,
0x55F55ED7, 0xF3727F61, 0x992F4C3F,
0x539B60EB, 0xED367E9C, 0x93DB447A,
0x513362F1, 0xE7057D89, 0x8F1C3C56,
0x4EBF64E8, 0xE0E47C29, 0x8AFA33DF,
0x4C3F66CF, 0xDAD67A7C, 0x877A2B1F,
0x49B468A6, 0xD4DF7884, 0x84A22223,
0x471C6A6D, 0xCF037641, 0x827518F9,
0x447A6C23, 0xC94473B5, 0x80F50FAB,
0x41CE6DC9, 0xC3A870E2, 0x80260648,
0x3F176F5E, 0xBE306DC9, 0x8009FCDA,
0x3C5670E2, 0xB8E26A6D, 0x809DF372,
0x398C7254, 0xB3BF66CF, 0x81E1EA1C,
0x36BA73B5, 0xAECB62F1, 0x83D5E0E4,
0x33DF7504, 0xAA095ED7, 0x8675D7D8,
0x30FB7641, 0xA57C5A82, 0x89BDCF03,
0x2E11776B, 0xA12755F5, 0x8DAAC672,
0x2B1F7884, 0x9D0D5133, 0x9235BE30,
0x28267989, 0x992F4C3F, 0x9758B64A,
0x25287A7C, 0x9591471C, 0x9D0DAECB,
0x22237B5C, 0x923541CE, 0xA34BA7BC,
0x1F1A7C29, 0x8F1C3C56, 0xAA09A127,
0x1C0B7CE3, 0x8C4936BA, 0xB13F9B16,
0x18F97D89, 0x89BD30FB, 0xB8E29591,
0x15E27E1D, 0x877A2B1F, 0xC0E790A0,
0x12C87E9C, 0x85822528, 0xC9448C49,
0x0FAB7F09, 0x83D51F1A, 0xD1ED8893,
0x0C8C7F61, 0x827518F9, 0xDAD68582,
0x096A7FA6, 0x816212C8, 0xE3F3831B,
0x06487FD8, 0x809D0C8C, 0xED368162,
0x03247FF5, 0x80260648, 0xF6948058,
0x7F610C8C, 0x7D8918F9, 0x7A7C2528,
0x7D8918F9, 0x764130FB, 0x6A6D471C,
0x7A7C2528, 0x6A6D471C, 0x513362F1,
0x764130FB, 0x5A825A82, 0x30FB7641,
0x70E23C56, 0x471C6A6D, 0x0C8C7F61,
0x6A6D471C, 0x30FB7641, 0xE7057D89,
0x62F15133, 0x18F97D89, 0xC3A870E2,
0x5A825A82, 0x00007FFF, 0xA57C5A82,
0x513362F1, 0xE7057D89, 0x8F1C3C56,
0x471C6A6D, 0xCF037641, 0x827518F9,
0x3C5670E2, 0xB8E26A6D, 0x809DF372,
0x30FB7641, 0xA57C5A82, 0x89BDCF03,
0x25287A7C, 0x9591471C, 0x9D0DAECB,
0x18F97D89, 0x89BD30FB, 0xB8E29591,
0x0C8C7F61, 0x827518F9, 0xDAD68582,
0x764130FB, 0x5A825A82, 0x30FB7641,
0x5A825A82, 0x00007FFF, 0xA57C5A82,
0x30FB7641, 0xA57C5A82, 0x89BDCF03
};
/*
------------------------------------------------------------------------------
Forward FFT radix-2 table
------------------------------------------------------------------------------
*/
const Int32 w_512rx2[127] =
{
/* Q15 */
0x7FFE0192, 0x7FF60324, 0x7FEA04B6,
0x7FD90648, 0x7FC207D9, 0x7FA7096B, 0x7F870AFB,
0x7F620C8C, 0x7F380E1C, 0x7F0A0FAB, 0x7ED6113A,
0x7E9D12C8, 0x7E601455, 0x7E1E15E2, 0x7DD6176E,
0x7D8A18F9, 0x7D3A1A83, 0x7CE41C0C, 0x7C891D93,
0x7C2A1F1A, 0x7BC6209F, 0x7B5D2224, 0x7AEF23A7,
0x7A7D2528, 0x7A0626A8, 0x798A2827, 0x790A29A4,
0x78852B1F, 0x77FB2C99, 0x776C2E11, 0x76D92F87,
0x764230FC, 0x75A6326E, 0x750533DF, 0x7460354E,
0x73B636BA, 0x73083825, 0x7255398D, 0x719E3AF3,
0x70E33C57, 0x70233DB8, 0x6F5F3F17, 0x6E974074,
0x6DCA41CE, 0x6CF94326, 0x6C24447B, 0x6B4B45CD,
0x6A6E471D, 0x698C486A, 0x68A749B4, 0x67BD4AFB,
0x66D04C40, 0x65DE4D81, 0x64E94EC0, 0x63EF4FFB,
0x62F25134, 0x61F15269, 0x60EC539B, 0x5FE454CA,
0x5ED755F6, 0x5DC8571E, 0x5CB45843, 0x5B9D5964,
0x5A825A82, 0x59645B9D, 0x58435CB4, 0x571E5DC8,
0x55F65ED7, 0x54CA5FE4, 0x539B60EC, 0x526961F1,
0x513462F2, 0x4FFB63EF, 0x4EC064E9, 0x4D8165DE,
0x4C4066D0, 0x4AFB67BD, 0x49B468A7, 0x486A698C,
0x471D6A6E, 0x45CD6B4B, 0x447B6C24, 0x43266CF9,
0x41CE6DCA, 0x40746E97, 0x3F176F5F, 0x3DB87023,
0x3C5770E3, 0x3AF3719E, 0x398D7255, 0x38257308,
0x36BA73B6, 0x354E7460, 0x33DF7505, 0x326E75A6,
0x30FC7642, 0x2F8776D9, 0x2E11776C, 0x2C9977FB,
0x2B1F7885, 0x29A4790A, 0x2827798A, 0x26A87A06,
0x25287A7D, 0x23A77AEF, 0x22247B5D, 0x209F7BC6,
0x1F1A7C2A, 0x1D937C89, 0x1C0C7CE4, 0x1A837D3A,
0x18F97D8A, 0x176E7DD6, 0x15E27E1E, 0x14557E60,
0x12C87E9D, 0x113A7ED6, 0x0FAB7F0A, 0x0E1C7F38,
0x0C8C7F62, 0x0AFB7F87, 0x096B7FA7, 0x07D97FC2,
0x06487FD9, 0x04B67FEA, 0x03247FF6, 0x01927FFE
};
|
