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Diffstat (limited to 'libAACdec/src/ldfiltbank.cpp')
| -rw-r--r-- | libAACdec/src/ldfiltbank.cpp | 298 |
1 files changed, 182 insertions, 116 deletions
diff --git a/libAACdec/src/ldfiltbank.cpp b/libAACdec/src/ldfiltbank.cpp index c08cc41..66a5914 100644 --- a/libAACdec/src/ldfiltbank.cpp +++ b/libAACdec/src/ldfiltbank.cpp @@ -1,74 +1,85 @@ - -/* ----------------------------------------------------------------------------------------------------------- +/* ----------------------------------------------------------------------------- Software License for The Fraunhofer FDK AAC Codec Library for Android -© Copyright 1995 - 2013 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. - All rights reserved. +© 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. +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: +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 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 +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. +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. +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." +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. +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. +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. +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 @@ -79,18 +90,17 @@ Am Wolfsmantel 33 www.iis.fraunhofer.de/amm amm-info@iis.fraunhofer.de ------------------------------------------------------------------------------------------------------------ */ +----------------------------------------------------------------------------- */ -/***************************************************************************\ -* - * filename: ldfiltbank.c - * project : MPEG-4 Audio Decoder - * contents/description: low delay filterbank - * -\***************************************************************************/ +/**************************** AAC decoder library ****************************** -#include "ldfiltbank.h" + Author(s): + + Description: low delay filterbank +*******************************************************************************/ + +#include "ldfiltbank.h" #include "aac_rom.h" #include "dct.h" @@ -99,110 +109,166 @@ amm-info@iis.fraunhofer.de #define LDFB_HEADROOM 2 -static void multE2_DinvF_fdk(INT_PCM *output, FIXP_DBL* x, const FIXP_WTB* fb, FIXP_DBL* z, const int N, const int stride) -{ - int i, scale; +#if defined(__arm__) +#endif + +static void multE2_DinvF_fdk(FIXP_PCM *output, FIXP_DBL *x, const FIXP_WTB *fb, + FIXP_DBL *z, const int N) { + int i; /* scale for FIXP_DBL -> INT_PCM conversion. */ - scale = (DFRACT_BITS - SAMPLE_BITS) - LDFB_HEADROOM; + const int scale = (DFRACT_BITS - SAMPLE_BITS) - LDFB_HEADROOM; +#if ((DFRACT_BITS - SAMPLE_BITS - LDFB_HEADROOM) > 0) + FIXP_DBL rnd_val_wts0 = (FIXP_DBL)0; + FIXP_DBL rnd_val_wts1 = (FIXP_DBL)0; + if (-WTS0 - 1 + scale) + rnd_val_wts0 = (FIXP_DBL)(1 << (-WTS0 - 1 + scale - 1)); + if (-WTS1 - 1 + scale) + rnd_val_wts1 = (FIXP_DBL)(1 << (-WTS1 - 1 + scale - 1)); +#endif - for(i=0;i<N/4;i++) - { + for (i = 0; i < N / 4; i++) { FIXP_DBL z0, z2, tmp; - z2 = x[N/2+i]; - z0 = z2 + ( fMultDiv2(z[N/2+i], fb[2*N + i]) >> (-WTS2-1) ); + z2 = x[N / 2 + i]; + z0 = z2 + (fMultDiv2(z[N / 2 + i], fb[2 * N + i]) >> (-WTS2 - 1)); - z[N/2+i] = x[N/2-1-i] + ( fMultDiv2(z[N + i], fb[2*N + N/2 + i]) >> (-WTS2-1) ); + z[N / 2 + i] = x[N / 2 - 1 - i] + + (fMultDiv2(z[N + i], fb[2 * N + N / 2 + i]) >> (-WTS2 - 1)); - tmp = ( fMultDiv2(z[N/2+i], fb[N+N/2-1-i]) + fMultDiv2(z[i], fb[N+N/2+i]) ) ; + tmp = (fMultDiv2(z[N / 2 + i], fb[N + N / 2 - 1 - i]) + + fMultDiv2(z[i], fb[N + N / 2 + i])); -#if (SAMPLE_BITS <= 16) - FDK_ASSERT( (-WTS1-1 + scale) >= 0); - output[(N*3/4-1-i)*stride] = (INT_PCM)SATURATE_RIGHT_SHIFT(tmp, -WTS1-1 + scale, SAMPLE_BITS); +#if ((DFRACT_BITS - SAMPLE_BITS - LDFB_HEADROOM) > 0) + FDK_ASSERT((-WTS1 - 1 + scale) >= 0); + FDK_ASSERT(tmp <= ((FIXP_DBL)0x7FFFFFFF - + rnd_val_wts1)); /* rounding must not cause overflow */ + output[(N * 3 / 4 - 1 - i)] = (FIXP_PCM)SATURATE_RIGHT_SHIFT( + tmp + rnd_val_wts1, -WTS1 - 1 + scale, PCM_OUT_BITS); #else - FDK_ASSERT( (WTS1+1 - scale) >= 0); - output[(N*3/4-1-i)*stride] = (INT_PCM)SATURATE_LEFT_SHIFT(tmp, WTS1+1 - scale, SAMPLE_BITS); + FDK_ASSERT((WTS1 + 1 - scale) >= 0); + output[(N * 3 / 4 - 1 - i)] = + (FIXP_PCM)SATURATE_LEFT_SHIFT(tmp, WTS1 + 1 - scale, PCM_OUT_BITS); #endif z[i] = z0; z[N + i] = z2; } - for(i=N/4;i<N/2;i++) - { + for (i = N / 4; i < N / 2; i++) { FIXP_DBL z0, z2, tmp0, tmp1; - z2 = x[N/2+i]; - z0 = z2 + ( fMultDiv2(z[N/2+i], fb[2*N + i]) >> (-WTS2-1) ); - - z[N/2+i] = x[N/2-1-i] + ( fMultDiv2(z[N + i], fb[2*N + N/2 + i]) >> (-WTS2-1) ); - - tmp0 = ( fMultDiv2(z[N/2+i], fb[N/2-1-i]) + fMultDiv2(z[i], fb[N/2+i]) ) ; - tmp1 = ( fMultDiv2(z[N/2+i], fb[N+N/2-1-i]) + fMultDiv2(z[i], fb[N+N/2+i]) ) ; - -#if (SAMPLE_BITS <= 16) - FDK_ASSERT( (-WTS0-1 + scale) >= 0); - output[(i-N/4)*stride] = (INT_PCM)SATURATE_RIGHT_SHIFT(tmp0, -WTS0-1 + scale, SAMPLE_BITS); - output[(N*3/4-1-i)*stride] = (INT_PCM)SATURATE_RIGHT_SHIFT(tmp1, -WTS1-1 + scale, SAMPLE_BITS); + z2 = x[N / 2 + i]; + z0 = z2 + (fMultDiv2(z[N / 2 + i], fb[2 * N + i]) >> (-WTS2 - 1)); + + z[N / 2 + i] = x[N / 2 - 1 - i] + + (fMultDiv2(z[N + i], fb[2 * N + N / 2 + i]) >> (-WTS2 - 1)); + + tmp0 = (fMultDiv2(z[N / 2 + i], fb[N / 2 - 1 - i]) + + fMultDiv2(z[i], fb[N / 2 + i])); + tmp1 = (fMultDiv2(z[N / 2 + i], fb[N + N / 2 - 1 - i]) + + fMultDiv2(z[i], fb[N + N / 2 + i])); + +#if ((DFRACT_BITS - SAMPLE_BITS - LDFB_HEADROOM) > 0) + FDK_ASSERT((-WTS0 - 1 + scale) >= 0); + FDK_ASSERT(tmp0 <= ((FIXP_DBL)0x7FFFFFFF - + rnd_val_wts0)); /* rounding must not cause overflow */ + FDK_ASSERT(tmp1 <= ((FIXP_DBL)0x7FFFFFFF - + rnd_val_wts1)); /* rounding must not cause overflow */ + output[(i - N / 4)] = (FIXP_PCM)SATURATE_RIGHT_SHIFT( + tmp0 + rnd_val_wts0, -WTS0 - 1 + scale, PCM_OUT_BITS); + output[(N * 3 / 4 - 1 - i)] = (FIXP_PCM)SATURATE_RIGHT_SHIFT( + tmp1 + rnd_val_wts1, -WTS1 - 1 + scale, PCM_OUT_BITS); #else - FDK_ASSERT( (WTS0+1 - scale) >= 0); - output[(i-N/4)*stride] = (INT_PCM)SATURATE_LEFT_SHIFT(tmp0, WTS0+1 - scale, SAMPLE_BITS); - output[(N*3/4-1-i)*stride] = (INT_PCM)SATURATE_LEFT_SHIFT(tmp1, WTS1+1 - scale, SAMPLE_BITS); + FDK_ASSERT((WTS0 + 1 - scale) >= 0); + output[(i - N / 4)] = + (FIXP_PCM)SATURATE_LEFT_SHIFT(tmp0, WTS0 + 1 - scale, PCM_OUT_BITS); + output[(N * 3 / 4 - 1 - i)] = + (FIXP_PCM)SATURATE_LEFT_SHIFT(tmp1, WTS1 + 1 - scale, PCM_OUT_BITS); #endif z[i] = z0; z[N + i] = z2; } /* Exchange quarter parts of x to bring them in the "right" order */ - for(i=0;i<N/4;i++) - { - FIXP_DBL tmp0 = fMultDiv2(z[i], fb[N/2+i]); - -#if (SAMPLE_BITS <= 16) - FDK_ASSERT( (-WTS0-1 + scale) >= 0); - output[(N*3/4 + i)*stride] = (INT_PCM)SATURATE_RIGHT_SHIFT(tmp0, -WTS0-1 + scale, SAMPLE_BITS); + for (i = 0; i < N / 4; i++) { + FIXP_DBL tmp0 = fMultDiv2(z[i], fb[N / 2 + i]); + +#if ((DFRACT_BITS - SAMPLE_BITS - LDFB_HEADROOM) > 0) + FDK_ASSERT((-WTS0 - 1 + scale) >= 0); + FDK_ASSERT(tmp0 <= ((FIXP_DBL)0x7FFFFFFF - + rnd_val_wts0)); /* rounding must not cause overflow */ + output[(N * 3 / 4 + i)] = (FIXP_PCM)SATURATE_RIGHT_SHIFT( + tmp0 + rnd_val_wts0, -WTS0 - 1 + scale, PCM_OUT_BITS); #else - FDK_ASSERT( (WTS0+1 - scale) >= 0); - output[(N*3/4 + i)*stride] = (INT_PCM)SATURATE_LEFT_SHIFT(tmp0, WTS0+1 - scale, SAMPLE_BITS); + FDK_ASSERT((WTS0 + 1 - scale) >= 0); + output[(N * 3 / 4 + i)] = + (FIXP_PCM)SATURATE_LEFT_SHIFT(tmp0, WTS0 + 1 - scale, PCM_OUT_BITS); #endif } } -int InvMdctTransformLowDelay_fdk (FIXP_DBL *mdctData, const int mdctData_e, INT_PCM *output, FIXP_DBL *fs_buffer, const int stride, const int N) { - +int InvMdctTransformLowDelay_fdk(FIXP_DBL *mdctData, const int mdctData_e, + FIXP_PCM *output, FIXP_DBL *fs_buffer, + const int N) { const FIXP_WTB *coef; FIXP_DBL gain = (FIXP_DBL)0; - int scale = mdctData_e + MDCT_OUT_HEADROOM - LDFB_HEADROOM; /* The LDFB_HEADROOM is compensated inside multE2_DinvF_fdk() below */ + int scale = mdctData_e + MDCT_OUT_HEADROOM - + LDFB_HEADROOM; /* The LDFB_HEADROOM is compensated inside + multE2_DinvF_fdk() below */ /* Select LD window slope */ - if (N == 512) - coef = (FIXP_WTB*)LowDelaySynthesis512; - else - coef = (FIXP_WTB*)LowDelaySynthesis480; + switch (N) { + case 256: + coef = LowDelaySynthesis256; + break; + case 240: + coef = LowDelaySynthesis240; + break; + case 160: + coef = LowDelaySynthesis160; + break; + case 128: + coef = LowDelaySynthesis128; + break; + case 120: + coef = LowDelaySynthesis120; + break; + case 512: + coef = LowDelaySynthesis512; + break; + case 480: + default: + coef = LowDelaySynthesis480; + break; + } /* Apply exponent and 1/N factor. Note: "scale" is off by one because for LD_MDCT the window length is twice - the window length of a regular MDCT. This is corrected inside multE2_DinvF_fdk(). - Refer to ISO/IEC 14496-3:2009 page 277, chapter 4.6.20.2 "Low Delay Window". + the window length of a regular MDCT. This is corrected inside + multE2_DinvF_fdk(). Refer to ISO/IEC 14496-3:2009 page 277, + chapter 4.6.20.2 "Low Delay Window". */ imdct_gain(&gain, &scale, N); dct_IV(mdctData, N, &scale); + if (N == 256 || N == 240 || N == 160) { + scale -= 1; + } else if (N == 128 || N == 120) { + scale -= 2; + } + if (gain != (FIXP_DBL)0) { scaleValuesWithFactor(mdctData, gain, N, scale); } else { scaleValues(mdctData, N, scale); } - /* Since all exponent and factors have been applied, current exponent is zero. */ - multE2_DinvF_fdk(output, mdctData, coef, fs_buffer, N, stride); + /* Since all exponent and factors have been applied, current exponent is zero. + */ + multE2_DinvF_fdk(output, mdctData, coef, fs_buffer, N); return (1); } - - - - |