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/* -----------------------------------------------------------------------------------------------------------
Software License for The Fraunhofer FDK AAC Codec Library for Android
© Copyright 1995 - 2012 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
----------------------------------------------------------------------------------------------------------- */
#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
FDK_INLINE
/* __attribute__((noinline)) */
static 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
FDK_INLINE
/* __attribute__((noinline)) */
static 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 */
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