/* ----------------------------------------------------------------------------- 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 */