fenix
/
fdk-aac
mirror of https://github.com/mstorsjo/fdk-aac.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

UBSAN overflow in FFT 

An overflow in the fft was observed for certain configurations. The root cause was in the scaling of the fft input data in dct_IV and dst_IV.
The following patch revises the scaling in dct and removes the unused arm implementation.

Bug: 112661057
Bug: 109936783
Bug: 112022208
Test: atest DecoderTestXheAac ; atest DecoderTestAacDrc
Change-Id: Idc9c44a9755b8151d5c7d8107696f43ac592413b
This commit is contained in:
Fraunhofer IIS FDK 2018-06-19 16:38:16 +02:00 committed by Jean-Michel Trivi
parent c75797cfaa
commit bef1b4dd96
2 changed files with 23 additions and 623 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

572
libFDK/src/arm/dct_arm.cpp
View File

@ -1,572 +0,0 @@
/* -----------------------------------------------------------------------------
Software License for The Fraunhofer FDK AAC Codec Library for Android
© Copyright 1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten
Forschung e.V. All rights reserved.
1. INTRODUCTION
The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software
that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding
scheme for digital audio. This FDK AAC Codec software is intended to be used on
a wide variety of Android devices.
AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient
general perceptual audio codecs. AAC-ELD is considered the best-performing
full-bandwidth communications codec by independent studies and is widely
deployed. AAC has been standardized by ISO and IEC as part of the MPEG
specifications.
Patent licenses for necessary patent claims for the FDK AAC Codec (including
those of Fraunhofer) may be obtained through Via Licensing
(www.vialicensing.com) or through the respective patent owners individually for
the purpose of encoding or decoding bit streams in products that are compliant
with the ISO/IEC MPEG audio standards. Please note that most manufacturers of
Android devices already license these patent claims through Via Licensing or
directly from the patent owners, and therefore FDK AAC Codec software may
already be covered under those patent licenses when it is used for those
licensed purposes only.
Commercially-licensed AAC software libraries, including floating-point versions
with enhanced sound quality, are also available from Fraunhofer. Users are
encouraged to check the Fraunhofer website for additional applications
information and documentation.
2. COPYRIGHT LICENSE
Redistribution and use in source and binary forms, with or without modification,
are permitted without payment of copyright license fees provided that you
satisfy the following conditions:
You must retain the complete text of this software license in redistributions of
the FDK AAC Codec or your modifications thereto in source code form.
You must retain the complete text of this software license in the documentation
and/or other materials provided with redistributions of the FDK AAC Codec or
your modifications thereto in binary form. You must make available free of
charge copies of the complete source code of the FDK AAC Codec and your
modifications thereto to recipients of copies in binary form.
The name of Fraunhofer may not be used to endorse or promote products derived
from this library without prior written permission.
You may not charge copyright license fees for anyone to use, copy or distribute
the FDK AAC Codec software or your modifications thereto.
Your modified versions of the FDK AAC Codec must carry prominent notices stating
that you changed the software and the date of any change. For modified versions
of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android"
must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK
AAC Codec Library for Android."
3. NO PATENT LICENSE
NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without
limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE.
Fraunhofer provides no warranty of patent non-infringement with respect to this
software.
You may use this FDK AAC Codec software or modifications thereto only for
purposes that are authorized by appropriate patent licenses.
4. DISCLAIMER
This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright
holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
including but not limited to the implied warranties of merchantability and
fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary,
or consequential damages, including but not limited to procurement of substitute
goods or services; loss of use, data, or profits, or business interruption,
however caused and on any theory of liability, whether in contract, strict
liability, or tort (including negligence), arising in any way out of the use of
this software, even if advised of the possibility of such damage.
5. CONTACT INFORMATION
Fraunhofer Institute for Integrated Circuits IIS
Attention: Audio and Multimedia Departments - FDK AAC LL
Am Wolfsmantel 33
91058 Erlangen, Germany
www.iis.fraunhofer.de/amm
amm-info@iis.fraunhofer.de
----------------------------------------------------------------------------- */
/******************* Library for basic calculation routines ********************
Author(s):
Description:
*******************************************************************************/
#ifdef FUNCTION_dct_IV_func1
/*
Note: This assembler routine is here, because the ARM926 compiler does
not encode the inline assembler with optimal speed.
With this version, we save 2 cycles per loop iteration.
*/
__asm void dct_IV_func1(int i, const FIXP_SPK *twiddle,
FIXP_DBL *RESTRICT pDat_0, FIXP_DBL *RESTRICT pDat_1) {
/* Register map:
r0 i
r1 twiddle
r2 pDat_0
r3 pDat_1
r4 accu1
r5 accu2
r6 accu3
r7 accu4
r8 val_tw
r9 accuX
*/
PUSH{r4 - r9}
/* 44 cycles for 2 iterations = 22 cycles/iteration */
dct_IV_loop1_start
/* First iteration */
LDR r8,
[r1],
# 4 // val_tw = *twiddle++;
LDR r5,
[ r2, #0 ] // accu2 = pDat_0[0]
LDR r4,
[ r3, #0 ] // accu1 = pDat_1[0]
SMULWT r9,
r5,
r8 // accuX = accu2*val_tw.l
SMULWB r5,
r5,
r8 // accu2 = accu2*val_tw.h
RSB r9,
r9,
# 0 // accuX =-accu2*val_tw.l
SMLAWT r5, r4, r8,
r5 // accu2 = accu2*val_tw.h + accu1*val_tw.l
SMLAWB r4,
r4, r8,
r9 // accu1 = accu1*val_tw.h - accu2*val_tw.l
LDR r8,
[r1],
# 4 // val_tw = *twiddle++;
LDR r7,
[ r3, # - 4 ] // accu4 = pDat_1[-1]
LDR r6,
[ r2, #4 ] // accu3 = pDat_0[1]
SMULWB r9,
r7,
r8 // accuX = accu4*val_tw.h
SMULWT r7,
r7,
r8 // accu4 = accu4*val_tw.l
RSB r9,
r9,
# 0 // accuX =-accu4*val_tw.h
SMLAWB r7, r6, r8,
r7 // accu4 = accu4*val_tw.l+accu3*val_tw.h
SMLAWT r6,
r6, r8,
r9 // accu3 = accu3*val_tw.l-accu4*val_tw.h
STR r5,
[r2],
# 4 // *pDat_0++ = accu2
STR r4, [r2],
# 4 // *pDat_0++ = accu1
STR r6, [r3],
#- 4 // *pDat_1-- = accu3
STR r7, [r3],
#- 4 // *pDat_1-- = accu4
/* Second iteration */
LDR r8, [r1],
# 4 // val_tw = *twiddle++;
LDR r5,
[ r2, #0 ] // accu2 = pDat_0[0]
LDR r4,
[ r3, #0 ] // accu1 = pDat_1[0]
SMULWT r9,
r5,
r8 // accuX = accu2*val_tw.l
SMULWB r5,
r5,
r8 // accu2 = accu2*val_tw.h
RSB r9,
r9,
# 0 // accuX =-accu2*val_tw.l
SMLAWT r5, r4, r8,
r5 // accu2 = accu2*val_tw.h + accu1*val_tw.l
SMLAWB r4,
r4, r8,
r9 // accu1 = accu1*val_tw.h - accu2*val_tw.l
LDR r8,
[r1],
# 4 // val_tw = *twiddle++;
LDR r7,
[ r3, # - 4 ] // accu4 = pDat_1[-1]
LDR r6,
[ r2, #4 ] // accu3 = pDat_0[1]
SMULWB r9,
r7,
r8 // accuX = accu4*val_tw.h
SMULWT r7,
r7,
r8 // accu4 = accu4*val_tw.l
RSB r9,
r9,
# 0 // accuX =-accu4*val_tw.h
SMLAWB r7, r6, r8,
r7 // accu4 = accu4*val_tw.l+accu3*val_tw.h
SMLAWT r6,
r6, r8,
r9 // accu3 = accu3*val_tw.l-accu4*val_tw.h
STR r5,
[r2],
# 4 // *pDat_0++ = accu2
STR r4, [r2],
# 4 // *pDat_0++ = accu1
STR r6, [r3],
#- 4 // *pDat_1-- = accu3
STR r7, [r3],
#- 4 // *pDat_1-- = accu4
SUBS r0, r0,
# 1 BNE dct_IV_loop1_start
POP { r4 - r9 }
BX lr
}
#endif /* FUNCTION_dct_IV_func1 */
#ifdef FUNCTION_dct_IV_func2
/* __attribute__((noinline)) */
static inline void dct_IV_func2(int i, const FIXP_SPK *twiddle,
FIXP_DBL *pDat_0, FIXP_DBL *pDat_1, int inc) {
FIXP_DBL accu1, accu2, accu3, accu4, accuX;
LONG val_tw;
accu1 = pDat_1[-2];
accu2 = pDat_1[-1];
*--pDat_1 = -(pDat_0[1] >> 1);
*pDat_0++ = (pDat_0[0] >> 1);
twiddle += inc;
__asm {
LDR val_tw, [twiddle], inc, LSL #2 // val_tw = *twiddle; twiddle += inc
B dct_IV_loop2_2nd_part
/* 42 cycles for 2 iterations = 21 cycles/iteration */
dct_IV_loop2:
SMULWT accuX, accu2, val_tw
SMULWB accu2, accu2, val_tw
RSB accuX, accuX, #0
SMLAWB accuX, accu1, val_tw, accuX
SMLAWT accu2, accu1, val_tw, accu2
STR accuX, [pDat_0], #4
STR accu2, [pDat_1, #-4] !
LDR accu4, [pDat_0, #4]
LDR accu3, [pDat_0]
SMULWB accuX, accu4, val_tw
SMULWT accu4, accu4, val_tw
RSB accuX, accuX, #0
SMLAWT accuX, accu3, val_tw, accuX
SMLAWB accu4, accu3, val_tw, accu4
LDR accu1, [pDat_1, #-8]
LDR accu2, [pDat_1, #-4]
LDR val_tw, [twiddle], inc, LSL #2 // val_tw = *twiddle; twiddle += inc
STR accuX, [pDat_1, #-4] !
STR accu4, [pDat_0], #4
dct_IV_loop2_2nd_part:
SMULWT accuX, accu2, val_tw
SMULWB accu2, accu2, val_tw
RSB accuX, accuX, #0
SMLAWB accuX, accu1, val_tw, accuX
SMLAWT accu2, accu1, val_tw, accu2
STR accuX, [pDat_0], #4
STR accu2, [pDat_1, #-4] !
LDR accu4, [pDat_0, #4]
LDR accu3, [pDat_0]
SMULWB accuX, accu4, val_tw
SMULWT accu4, accu4, val_tw
RSB accuX, accuX, #0
SMLAWT accuX, accu3, val_tw, accuX
SMLAWB accu4, accu3, val_tw, accu4
LDR accu1, [pDat_1, #-8]
LDR accu2, [pDat_1, #-4]
STR accuX, [pDat_1, #-4] !
STR accu4, [pDat_0], #4
LDR val_tw, [twiddle], inc, LSL #2 // val_tw = *twiddle; twiddle += inc
SUBS i, i, #1
BNE dct_IV_loop2
}
/* Last Sin and Cos value pair are the same */
accu1 = fMultDiv2(accu1, WTC(0x5a82799a));
accu2 = fMultDiv2(accu2, WTC(0x5a82799a));
*--pDat_1 = accu1 + accu2;
*pDat_0++ = accu1 - accu2;
}
#endif /* FUNCTION_dct_IV_func2 */
#ifdef FUNCTION_dst_IV_func1
__asm void dst_IV_func1(int i, const FIXP_SPK *twiddle, FIXP_DBL *pDat_0,
FIXP_DBL *pDat_1) {
/* Register map:
r0 i
r1 twiddle
r2 pDat_0
r3 pDat_1
r4 accu1
r5 accu2
r6 accu3
r7 accu4
r8 val_tw
r9 accuX
*/
PUSH{r4 - r9}
dst_IV_loop1 LDR r8,
[r1],
# 4 // val_tw = *twiddle++
LDR r5,
[r2] // accu2 = pDat_0[0]
LDR r6,
[ r2, #4 ] // accu3 = pDat_0[1]
RSB r5,
r5,
# 0 // accu2 = -accu2
SMULWT r9, r5,
r8 // accuX = (-accu2)*val_tw.l
LDR r4,
[ r3, # - 4 ] // accu1 = pDat_1[-1]
RSB r9,
r9,
# 0 // accuX = -(-accu2)*val_tw.l
SMLAWB r9, r4, r8,
r9 // accuX = accu1*val_tw.h-(-accu2)*val_tw.l
SMULWT r4,
r4,
r8 // accu1 = accu1*val_tw.l
LDR r7,
[ r3, # - 8 ] // accu4 = pDat_1[-2]
SMLAWB r5,
r5, r8,
r4 // accu2 = (-accu2)*val_tw.t+accu1*val_tw.l
LDR r8,
[r1],
# 4 // val_tw = *twiddle++
STR r5, [r2],
# 4 // *pDat_0++ = accu2
STR r9, [r2],
# 4 // *pDat_0++ = accu1 (accuX)
RSB r7, r7,
# 0 // accu4 = -accu4
SMULWB r5, r7,
r8 // accu2 = (-accu4)*val_tw.h
SMULWB r4,
r6,
r8 // accu1 = (-accu4)*val_tw.l
RSB r5,
r5,
# 0 // accu2 = -(-accu4)*val_tw.h
SMLAWT r6, r6, r8,
r5 // accu3 = (-accu4)*val_tw.l-(-accu3)*val_tw.h
SMLAWT r7,
r7, r8,
r4 // accu4 = (-accu3)*val_tw.l+(-accu4)*val_tw.h
STR r6,
[ r3, # - 4 ] ! // *--pDat_1 = accu3
STR r7,
[ r3, # - 4 ] ! // *--pDat_1 = accu4
LDR r8,
[r1],
# 4 // val_tw = *twiddle++
LDR r5,
[r2] // accu2 = pDat_0[0]
LDR r6,
[ r2, #4 ] // accu3 = pDat_0[1]
RSB r5,
r5,
# 0 // accu2 = -accu2
SMULWT r9, r5,
r8 // accuX = (-accu2)*val_tw.l
LDR r4,
[ r3, # - 4 ] // accu1 = pDat_1[-1]
RSB r9,
r9,
# 0 // accuX = -(-accu2)*val_tw.l
SMLAWB r9, r4, r8,
r9 // accuX = accu1*val_tw.h-(-accu2)*val_tw.l
SMULWT r4,
r4,
r8 // accu1 = accu1*val_tw.l
LDR r7,
[ r3, # - 8 ] // accu4 = pDat_1[-2]
SMLAWB r5,
r5, r8,
r4 // accu2 = (-accu2)*val_tw.t+accu1*val_tw.l
LDR r8,
[r1],
# 4 // val_tw = *twiddle++
STR r5, [r2],
# 4 // *pDat_0++ = accu2
STR r9, [r2],
# 4 // *pDat_0++ = accu1 (accuX)
RSB r7, r7,
# 0 // accu4 = -accu4
SMULWB r5, r7,
r8 // accu2 = (-accu4)*val_tw.h
SMULWB r4,
r6,
r8 // accu1 = (-accu4)*val_tw.l
RSB r5,
r5,
# 0 // accu2 = -(-accu4)*val_tw.h
SMLAWT r6, r6, r8,
r5 // accu3 = (-accu4)*val_tw.l-(-accu3)*val_tw.h
SMLAWT r7,
r7, r8,
r4 // accu4 = (-accu3)*val_tw.l+(-accu4)*val_tw.h
STR r6,
[ r3, # - 4 ] ! // *--pDat_1 = accu3
STR r7,
[ r3, # - 4 ] ! // *--pDat_1 = accu4
SUBS r0,
r0,
# 4 // i-= 4
BNE dst_IV_loop1
POP{r4 - r9} BX lr
}
#endif /* FUNCTION_dst_IV_func1 */
#ifdef FUNCTION_dst_IV_func2
/* __attribute__((noinline)) */
static inline void dst_IV_func2(int i, const FIXP_SPK *twiddle,
FIXP_DBL *RESTRICT pDat_0,
FIXP_DBL *RESTRICT pDat_1, int inc) {
FIXP_DBL accu1, accu2, accu3, accu4;
LONG val_tw;
accu4 = pDat_0[0];
accu3 = pDat_0[1];
accu4 >>= 1;
accu3 >>= 1;
accu4 = -accu4;
accu1 = pDat_1[-1];
accu2 = pDat_1[0];
*pDat_0++ = accu3;
*pDat_1-- = accu4;
__asm {
B dst_IV_loop2_2nd_part
/* 50 cycles for 2 iterations = 25 cycles/iteration */
dst_IV_loop2:
LDR val_tw, [twiddle], inc, LSL #2 // val_tw = *twiddle; twiddle += inc
RSB accu2, accu2, #0 // accu2 = -accu2
RSB accu1, accu1, #0 // accu1 = -accu1
SMULWT accu3, accu2, val_tw // accu3 = (-accu2)*val_tw.l
SMULWT accu4, accu1, val_tw // accu4 = (-accu1)*val_tw.l
RSB accu3, accu3, #0 // accu3 = -accu2*val_tw.l
SMLAWB accu1, accu1, val_tw, accu3 // accu1 = -accu1*val_tw.h-(-accu2)*val_tw.l
SMLAWB accu2, accu2, val_tw, accu4 // accu2 = (-accu1)*val_tw.l+(-accu2)*val_tw.h
STR accu1, [pDat_1], #-4 // *pDat_1-- = accu1
STR accu2, [pDat_0], #4 // *pDat_0++ = accu2
LDR accu4, [pDat_0] // accu4 = pDat_0[0]
LDR accu3, [pDat_0, #4] // accu3 = pDat_0[1]
RSB accu4, accu4, #0 // accu4 = -accu4
RSB accu3, accu3, #0 // accu3 = -accu3
SMULWB accu1, accu3, val_tw // accu1 = (-accu3)*val_tw.h
SMULWT accu2, accu3, val_tw // accu2 = (-accu3)*val_tw.l
RSB accu1, accu1, #0 // accu1 = -(-accu3)*val_tw.h
SMLAWT accu3, accu4, val_tw, accu1 // accu3 = (-accu4)*val_tw.l-(-accu3)*val_tw.h
SMLAWB accu4, accu4, val_tw, accu2 // accu4 = (-accu3)*val_tw.l+(-accu4)*val_tw.h
LDR accu1, [pDat_1, #-4] // accu1 = pDat_1[-1]
LDR accu2, [pDat_1] // accu2 = pDat_1[0]
STR accu3, [pDat_0], #4 // *pDat_0++ = accu3
STR accu4, [pDat_1], #-4 // *pDat_1-- = accu4
dst_IV_loop2_2nd_part:
LDR val_tw, [twiddle], inc, LSL #2 // val_tw = *twiddle; twiddle += inc
RSB accu2, accu2, #0 // accu2 = -accu2
RSB accu1, accu1, #0 // accu1 = -accu1
SMULWT accu3, accu2, val_tw // accu3 = (-accu2)*val_tw.l
SMULWT accu4, accu1, val_tw // accu4 = (-accu1)*val_tw.l
RSB accu3, accu3, #0 // accu3 = -accu2*val_tw.l
SMLAWB accu1, accu1, val_tw, accu3 // accu1 = -accu1*val_tw.h-(-accu2)*val_tw.l
SMLAWB accu2, accu2, val_tw, accu4 // accu2 = (-accu1)*val_tw.l+(-accu2)*val_tw.h
STR accu1, [pDat_1], #-4 // *pDat_1-- = accu1
STR accu2, [pDat_0], #4 // *pDat_0++ = accu2
LDR accu4, [pDat_0] // accu4 = pDat_0[0]
LDR accu3, [pDat_0, #4] // accu3 = pDat_0[1]
RSB accu4, accu4, #0 // accu4 = -accu4
RSB accu3, accu3, #0 // accu3 = -accu3
SMULWB accu1, accu3, val_tw // accu1 = (-accu3)*val_tw.h
SMULWT accu2, accu3, val_tw // accu2 = (-accu3)*val_tw.l
RSB accu1, accu1, #0 // accu1 = -(-accu3)*val_tw.h
SMLAWT accu3, accu4, val_tw, accu1 // accu3 = (-accu4)*val_tw.l-(-accu3)*val_tw.h
SMLAWB accu4, accu4, val_tw, accu2 // accu4 = (-accu3)*val_tw.l+(-accu4)*val_tw.h
LDR accu1, [pDat_1, #-4] // accu1 = pDat_1[-1]
LDR accu2, [pDat_1] // accu2 = pDat_1[0]
STR accu3, [pDat_0], #4 // *pDat_0++ = accu3
STR accu4, [pDat_1], #-4 // *pDat_1-- = accu4
SUBS i, i, #1
BNE dst_IV_loop2
}
/* Last Sin and Cos value pair are the same */
accu1 = fMultDiv2(-accu1, WTC(0x5a82799a));
accu2 = fMultDiv2(-accu2, WTC(0x5a82799a));
*pDat_0 = accu1 + accu2;
*pDat_1 = accu1 - accu2;
}
#endif /* FUNCTION_dst_IV_func2 */

74
libFDK/src/dct.cpp
View File

@ -124,10 +124,6 @@ amm-info@iis.fraunhofer.de
#include "FDK_tools_rom.h"
#include "fft.h"
#if defined(__arm__)
#include "arm/dct_arm.cpp"
#endif
void dct_getTables(const FIXP_WTP **ptwiddle, const FIXP_STP **sin_twiddle,
int *sin_step, int length) {
const FIXP_WTP *twiddle;
@ -387,12 +383,6 @@ void dct_IV(FIXP_DBL *pDat, int L, int *pDat_e) {
dct_getTables(&twiddle, &sin_twiddle, &sin_step, L);
#ifdef FUNCTION_dct_IV_func1
if (M >= 4 && (M & 3) == 0) {
/* ARM926: 44 cycles for 2 iterations = 22 cycles/iteration */
dct_IV_func1(M >> 2, twiddle, &pDat[0], &pDat[L - 1]);
} else
#endif /* FUNCTION_dct_IV_func1 */
{
FIXP_DBL *RESTRICT pDat_0 = &pDat[0];
FIXP_DBL *RESTRICT pDat_1 = &pDat[L - 2];
@ -410,10 +400,10 @@ void dct_IV(FIXP_DBL *pDat, int L, int *pDat_e) {
cplxMultDiv2(&accu1, &accu2, accu1, accu2, twiddle[i]);
cplxMultDiv2(&accu3, &accu4, accu4, accu3, twiddle[i + 1]);
pDat_0[0] = accu2;
pDat_0[1] = accu1;
pDat_1[0] = accu4;
pDat_1[1] = -accu3;
pDat_0[0] = accu2 >> 1;
pDat_0[1] = accu1 >> 1;
pDat_1[0] = accu4 >> 1;
pDat_1[1] = -(accu3 >> 1);
}
if (M & 1) {
FIXP_DBL accu1, accu2;
@ -423,19 +413,13 @@ void dct_IV(FIXP_DBL *pDat, int L, int *pDat_e) {
cplxMultDiv2(&accu1, &accu2, accu1, accu2, twiddle[i]);
pDat_0[0] = accu2;
pDat_0[1] = accu1;
pDat_0[0] = accu2 >> 1;
pDat_0[1] = accu1 >> 1;
}
}
fft(M, pDat, pDat_e);
#ifdef FUNCTION_dct_IV_func2
if (M >= 4 && (M & 3) == 0) {
/* ARM926: 42 cycles for 2 iterations = 21 cycles/iteration */
dct_IV_func2(M >> 2, sin_twiddle, &pDat[0], &pDat[L], sin_step);
} else
#endif /* FUNCTION_dct_IV_func2 */
{
FIXP_DBL *RESTRICT pDat_0 = &pDat[0];
FIXP_DBL *RESTRICT pDat_1 = &pDat[L - 2];
@ -446,20 +430,19 @@ void dct_IV(FIXP_DBL *pDat, int L, int *pDat_e) {
accu1 = pDat_1[0];
accu2 = pDat_1[1];
pDat_1[1] = -(pDat_0[1] >> 1);
pDat_0[0] = (pDat_0[0] >> 1);
pDat_1[1] = -pDat_0[1];
/* 28 cycles for ARM926 */
for (idx = sin_step, i = 1; i<(M + 1)>> 1; i++, idx += sin_step) {
FIXP_STP twd = sin_twiddle[idx];
cplxMultDiv2(&accu3, &accu4, accu1, accu2, twd);
cplxMult(&accu3, &accu4, accu1, accu2, twd);
pDat_0[1] = accu3;
pDat_1[0] = accu4;
pDat_0 += 2;
pDat_1 -= 2;
cplxMultDiv2(&accu3, &accu4, pDat_0[1], pDat_0[0], twd);
cplxMult(&accu3, &accu4, pDat_0[1], pDat_0[0], twd);
accu1 = pDat_1[0];
accu2 = pDat_1[1];
@ -470,8 +453,8 @@ void dct_IV(FIXP_DBL *pDat, int L, int *pDat_e) {
if ((M & 1) == 0) {
/* Last Sin and Cos value pair are the same */
accu1 = fMultDiv2(accu1, WTC(0x5a82799a));
accu2 = fMultDiv2(accu2, WTC(0x5a82799a));
accu1 = fMult(accu1, WTC(0x5a82799a));
accu2 = fMult(accu2, WTC(0x5a82799a));
pDat_1[0] = accu1 + accu2;
pDat_0[1] = accu1 - accu2;
@ -497,11 +480,6 @@ void dst_IV(FIXP_DBL *pDat, int L, int *pDat_e) {
dct_getTables(&twiddle, &sin_twiddle, &sin_step, L);
#ifdef FUNCTION_dst_IV_func1
if ((M >= 4) && ((M & 3) == 0)) {
dst_IV_func1(M, twiddle, &pDat[0], &pDat[L]);
} else
#endif
{
FIXP_DBL *RESTRICT pDat_0 = &pDat[0];
FIXP_DBL *RESTRICT pDat_1 = &pDat[L - 2];
@ -519,10 +497,10 @@ void dst_IV(FIXP_DBL *pDat, int L, int *pDat_e) {
cplxMultDiv2(&accu1, &accu2, accu1, accu2, twiddle[i]);
cplxMultDiv2(&accu3, &accu4, accu4, accu3, twiddle[i + 1]);
pDat_0[0] = accu2;
pDat_0[1] = accu1;
pDat_1[0] = accu4;
pDat_1[1] = -accu3;
pDat_0[0] = accu2 >> 1;
pDat_0[1] = accu1 >> 1;
pDat_1[0] = accu4 >> 1;
pDat_1[1] = -(accu3 >> 1);
}
if (M & 1) {
FIXP_DBL accu1, accu2;
@ -532,19 +510,13 @@ void dst_IV(FIXP_DBL *pDat, int L, int *pDat_e) {
cplxMultDiv2(&accu1, &accu2, accu1, accu2, twiddle[i]);
pDat_0[0] = accu2;
pDat_0[1] = accu1;
pDat_0[0] = accu2 >> 1;
pDat_0[1] = accu1 >> 1;
}
}
fft(M, pDat, pDat_e);
#ifdef FUNCTION_dst_IV_func2
if ((M >= 4) && ((M & 3) == 0)) {
dst_IV_func2(M >> 2, sin_twiddle + sin_step, &pDat[0], &pDat[L - 1],
sin_step);
} else
#endif /* FUNCTION_dst_IV_func2 */
{
FIXP_DBL *RESTRICT pDat_0;
FIXP_DBL *RESTRICT pDat_1;
@ -558,20 +530,20 @@ void dst_IV(FIXP_DBL *pDat, int L, int *pDat_e) {
accu1 = pDat_1[0];
accu2 = pDat_1[1];
pDat_1[1] = -(pDat_0[0] >> 1);
pDat_0[0] = (pDat_0[1] >> 1);
pDat_1[1] = -pDat_0[0];
pDat_0[0] = pDat_0[1];
for (idx = sin_step, i = 1; i<(M + 1)>> 1; i++, idx += sin_step) {
FIXP_STP twd = sin_twiddle[idx];
cplxMultDiv2(&accu3, &accu4, accu1, accu2, twd);
cplxMult(&accu3, &accu4, accu1, accu2, twd);
pDat_1[0] = -accu3;
pDat_0[1] = -accu4;
pDat_0 += 2;
pDat_1 -= 2;
cplxMultDiv2(&accu3, &accu4, pDat_0[1], pDat_0[0], twd);
cplxMult(&accu3, &accu4, pDat_0[1], pDat_0[0], twd);
accu1 = pDat_1[0];
accu2 = pDat_1[1];
@ -582,8 +554,8 @@ void dst_IV(FIXP_DBL *pDat, int L, int *pDat_e) {
if ((M & 1) == 0) {
/* Last Sin and Cos value pair are the same */
accu1 = fMultDiv2(accu1, WTC(0x5a82799a));
accu2 = fMultDiv2(accu2, WTC(0x5a82799a));
accu1 = fMult(accu1, WTC(0x5a82799a));
accu2 = fMult(accu2, WTC(0x5a82799a));
pDat_0[1] = -accu1 - accu2;
pDat_1[0] = accu2 - accu1;