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Change-Id: If584e579464f28b97d50e51fc76ba654a5536c54

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diff --git a/libFDK/src/arm/dct_arm.cpp b/libFDK/src/arm/dct_arm.cpp
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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 */