diff options
Diffstat (limited to 'libSBRdec/src/psdec_hybrid.cpp')
| -rw-r--r-- | libSBRdec/src/psdec_hybrid.cpp | 652 |
1 files changed, 0 insertions, 652 deletions
diff --git a/libSBRdec/src/psdec_hybrid.cpp b/libSBRdec/src/psdec_hybrid.cpp deleted file mode 100644 index cbd0e92..0000000 --- a/libSBRdec/src/psdec_hybrid.cpp +++ /dev/null @@ -1,652 +0,0 @@ - -/* ----------------------------------------------------------------------------------------------------------- -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. - - 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 ------------------------------------------------------------------------------------------------------------ */ - -#include "psdec_hybrid.h" - - -#include "fft.h" -#include "sbr_ram.h" - -#include "FDK_tools_rom.h" -#include "sbr_rom.h" - -/******************************************************************************* - Functionname: InitHybridFilterBank - ******************************************************************************* - - Description: Init one instance of HANDLE_HYBRID stuct - - Arguments: - - Return: none - -*******************************************************************************/ - - -SBR_ERROR -InitHybridFilterBank ( HANDLE_HYBRID hs, /*!< Handle to HYBRID struct. */ - SCHAR frameSize, /*!< Framesize (in Qmf súbband samples). */ - SCHAR noBands, /*!< Number of Qmf bands for hybrid filtering. */ - const UCHAR *pResolution ) /*!< Resolution in Qmf bands (length noBands). */ -{ - SCHAR i; - UCHAR maxNoChannels = 0; - - for (i = 0; i < noBands; i++) { - hs->pResolution[i] = pResolution[i]; - if(pResolution[i] > maxNoChannels) - maxNoChannels = pResolution[i]; - } - - hs->nQmfBands = noBands; - hs->frameSize = frameSize; - hs->qmfBufferMove = HYBRID_FILTER_LENGTH - 1; - - hs->sf_mQmfBuffer = 0; - - return SBRDEC_OK; -} - -/******************************************************************************* - Functionname: dualChannelFiltering - ******************************************************************************* - - Description: fast 2-channel real-valued filtering with 6-tap delay. - - Arguments: - - Return: none - -*******************************************************************************/ - -/*! -2 channel filter -<pre> - Filter Coefs: - 0.0, - 0.01899487526049, - 0.0, - -0.07293139167538, - 0.0, - 0.30596630545168, - 0.5, - 0.30596630545168, - 0.0, - -0.07293139167538, - 0.0, - 0.01899487526049, - 0.0 - - - Filter design: - h[q,n] = g[n] * cos(2pi/2 * q * (n-6) ); n = 0..12, q = 0,1; - - -> h[0,n] = g[n] * 1; - -> h[1,n] = g[n] * pow(-1,n); -</pre> -*/ - -static void slotBasedDualChannelFiltering( const FIXP_DBL *pQmfReal, - const FIXP_DBL *pQmfImag, - - FIXP_DBL *mHybridReal, - FIXP_DBL *mHybridImag) -{ - - FIXP_DBL t1, t3, t5, t6; - - /* symmetric filter coefficients */ - - /* you don't have to shift the result after fMult because of p2_13_20 <= 0.5 */ - t1 = fMultDiv2(p2_13_20[1] , ( (pQmfReal[1] >> 1) + (pQmfReal[11] >> 1))); - t3 = fMultDiv2(p2_13_20[3] , ( (pQmfReal[3] >> 1) + (pQmfReal[ 9] >> 1))); - t5 = fMultDiv2(p2_13_20[5] , ( (pQmfReal[5] >> 1) + (pQmfReal[ 7] >> 1))); - t6 = fMultDiv2(p2_13_20[6] , (pQmfReal[6] >> 1) ); - - mHybridReal[0] = (t1 + t3 + t5 + t6) << 2; - mHybridReal[1] = (- t1 - t3 - t5 + t6) << 2; - - t1 = fMultDiv2(p2_13_20[1] , ( (pQmfImag[1] >> 1) + (pQmfImag[11] >> 1))); - t3 = fMultDiv2(p2_13_20[3] , ( (pQmfImag[3] >> 1) + (pQmfImag[ 9] >> 1))); - t5 = fMultDiv2(p2_13_20[5] , ( (pQmfImag[5] >> 1) + (pQmfImag[ 7] >> 1))); - t6 = fMultDiv2(p2_13_20[6] , pQmfImag[6] >> 1 ); - - mHybridImag[0] = (t1 + t3 + t5 + t6) << 2; - mHybridImag[1] = (- t1 - t3 - t5 + t6) << 2; -} - - -/******************************************************************************* - Functionname: eightChannelFiltering - ******************************************************************************* - - Description: fast 8-channel complex-valued filtering with 6-tap delay. - - Arguments: - - Return: none - -*******************************************************************************/ -/*! - 8 channel filter - - Implementation using a FFT of length 8 -<pre> - prototype filter coefficients: - 0.00746082949812 0.02270420949825 0.04546865930473 0.07266113929591 0.09885108575264 0.11793710567217 - 0.125 - 0.11793710567217 0.09885108575264 0.07266113929591 0.04546865930473 0.02270420949825 0.00746082949812 - - Filter design: - N = 13; Q = 8; - h[q,n] = g[n] * exp(j * 2 * pi / Q * (q + .5) * (n - 6)); n = 0..(N-1), q = 0..(Q-1); - - Time Signal: x[t]; - Filter Bank Output - y[q,t] = conv(x[t],h[q,t]) = conv(h[q,t],x[t]) = sum(x[k] * h[q, t - k] ) = sum(h[q, k] * x[t - k] ); k = 0..(N-1); - - y[q,t] = x[t - 12]*h[q, 12] + x[t - 11]*h[q, 11] + x[t - 10]*h[q, 10] + x[t - 9]*h[q, 9] - + x[t - 8]*h[q, 8] + x[t - 7]*h[q, 7] - + x[t - 6]*h[q, 6] - + x[t - 5]*h[q, 5] + x[t - 4]*h[q, 4] - + x[t - 3]*h[q, 3] + x[t - 2]*h[q, 2] + x[t - 1]*h[q, 1] + x[t - 0]*h[q, 0]; - - h'[q, n] = h[q,(N-1)-n] = g[n] * exp(j * 2 * pi / Q * (q + .5) * (6 - n)); n = 0..(N-1), q = 0..(Q-1); - - y[q,t] = x[t - 12]*h'[q, 0] + x[t - 11]*h'[q, 1] + x[t - 10]*h'[q, 2] + x[t - 9]*h'[q, 3] - + x[t - 8]*h'[q, 4] + x[t - 7]*h'[q, 5] - + x[t - 6]*h'[q, 6] - + x[t - 5]*h'[q, 7] + x[t - 4]*h'[q, 8] - + x[t - 3]*h'[q, 9] + x[t - 2]*h'[q, 10] + x[t - 1]*h'[q, 11] + x[t - 0]*h'[q, 12]; - - Try to split off FFT Modulation Term: - FFT(x[t], q) = sum(x[t+k]*exp(-j*2*pi/N *q * k)) - c m - Step 1: h'[q,n] = g[n] * ( exp(j * 2 * pi / 8 * .5 * (6 - n)) ) * ( exp (j * 2 * pi / 8 * q * (6 - n)) ); - - h'[q,n] = g[n] *c[n] * m[q,n]; (see above) - c[n] = exp( j * 2 * pi / 8 * .5 * (6 - n) ); - m[q,n] = exp( j * 2 * pi / 8 * q * (6 - n) ); - - y[q,t] = x[t - 0]*g[0]*c[0]*m[q,0] + x[t - 1]*g[1]*c[ 1]*m[q, 1] + ... - ... + x[t - 12]*g[2]*c[12]*m[q,12]; - - | - n m *exp(-j*2*pi) | n' fft -------------------------------------------------------------------------------------------------------------------------- - 0 exp( j * 2 * pi / 8 * q * 6) -> exp(-j * 2 * pi / 8 * q * 2) | 2 exp(-j * 2 * pi / 8 * q * 0) - 1 exp( j * 2 * pi / 8 * q * 5) -> exp(-j * 2 * pi / 8 * q * 3) | 3 exp(-j * 2 * pi / 8 * q * 1) - 2 exp( j * 2 * pi / 8 * q * 4) -> exp(-j * 2 * pi / 8 * q * 4) | 4 exp(-j * 2 * pi / 8 * q * 2) - 3 exp( j * 2 * pi / 8 * q * 3) -> exp(-j * 2 * pi / 8 * q * 5) | 5 exp(-j * 2 * pi / 8 * q * 3) - 4 exp( j * 2 * pi / 8 * q * 2) -> exp(-j * 2 * pi / 8 * q * 6) | 6 exp(-j * 2 * pi / 8 * q * 4) - 5 exp( j * 2 * pi / 8 * q * 1) -> exp(-j * 2 * pi / 8 * q * 7) | 7 exp(-j * 2 * pi / 8 * q * 5) - 6 exp( j * 2 * pi / 8 * q * 0) | 0 exp(-j * 2 * pi / 8 * q * 6) - 7 exp(-j * 2 * pi / 8 * q * 1) | 1 exp(-j * 2 * pi / 8 * q * 7) - 8 exp(-j * 2 * pi / 8 * q * 2) | 2 - 9 exp(-j * 2 * pi / 8 * q * 3) | 3 - 10 exp(-j * 2 * pi / 8 * q * 4) | 4 - 11 exp(-j * 2 * pi / 8 * q * 5) | 5 - 12 exp(-j * 2 * pi / 8 * q * 6) | 6 - - - now use fft modulation coefficients - m[6] = = fft[0] - m[7] = = fft[1] - m[8] = m[ 0] = fft[2] - m[9] = m[ 1] = fft[3] - m[10] = m[ 2] = fft[4] - m[11] = m[ 3] = fft[5] - m[12] = m[ 4] = fft[6] - m[ 5] = fft[7] - - y[q,t] = ( x[t- 6]*g[ 6]*c[ 6] ) * fft[q,0] + - ( x[t- 7]*g[ 7]*c[ 7] ) * fft[q,1] + - ( x[t- 0]*g[ 0]*c[ 0] + x[t- 8]*g[ 8]*c[ 8] ) * fft[q,2] + - ( x[t- 1]*g[ 1]*c[ 1] + x[t- 9]*g[ 9]*c[ 9] ) * fft[q,3] + - ( x[t- 2]*g[ 2]*c[ 2] + x[t-10]*g[10]*c[10] ) * fft[q,4] + - ( x[t- 3]*g[ 3]*c[ 3] + x[t-11]*g[11]*c[11] ) * fft[q,5] + - ( x[t- 4]*g[ 4]*c[ 4] + x[t-12]*g[12]*c[12] ) * fft[q,6] + - ( x[t- 5]*g[ 5]*c[ 5] ) * fft[q,7]; - - pre twiddle factors c[n] = exp(j * 2 * pi / 8 * .5 * (6 - n)); - n c] | n c[n] | n c[n] ---------------------------------------------------------------------------------------------------- - 0 exp( j * 6 * pi / 8) | 1 exp( j * 5 * pi / 8) | 2 exp( j * 4 * pi / 8) - 3 exp( j * 3 * pi / 8) | 4 exp( j * 2 * pi / 8) | 5 exp( j * 1 * pi / 8) - 6 exp( j * 0 * pi / 8) | 7 exp(-j * 1 * pi / 8) | 8 exp(-j * 2 * pi / 8) - 9 exp(-j * 3 * pi / 8) | 10 exp(-j * 4 * pi / 8) | 11 exp(-j * 5 * pi / 8) - 12 exp(-j * 6 * pi / 8) | | -</pre> -*/ - -/* defining rotation factors for *ChannelFiltering */ - -#define cos0Pi FL2FXCONST_DBL( 1.f) -#define sin0Pi FL2FXCONST_DBL( 0.f) - -#define cos1Pi FL2FXCONST_DBL(-1.f) -#define sin1Pi FL2FXCONST_DBL( 0.f) - -#define cos1Pi_2 FL2FXCONST_DBL( 0.f) -#define sin1Pi_2 FL2FXCONST_DBL( 1.f) - -#define cos1Pi_3 FL2FXCONST_DBL( 0.5f) -#define sin1Pi_3 FL2FXCONST_DBL( 0.86602540378444f) - -#define cos0Pi_4 cos0Pi -#define cos1Pi_4 FL2FXCONST_DBL(0.70710678118655f) -#define cos2Pi_4 cos1Pi_2 -#define cos3Pi_4 (-cos1Pi_4) -#define cos4Pi_4 (-cos0Pi_4) -#define cos5Pi_4 cos3Pi_4 -#define cos6Pi_4 cos2Pi_4 - -#define sin0Pi_4 sin0Pi -#define sin1Pi_4 FL2FXCONST_DBL(0.70710678118655f) -#define sin2Pi_4 sin1Pi_2 -#define sin3Pi_4 sin1Pi_4 -#define sin4Pi_4 sin0Pi_4 -#define sin5Pi_4 (-sin3Pi_4) -#define sin6Pi_4 (-sin2Pi_4) - -#define cos0Pi_8 cos0Pi -#define cos1Pi_8 FL2FXCONST_DBL(0.92387953251129f) -#define cos2Pi_8 cos1Pi_4 -#define cos3Pi_8 FL2FXCONST_DBL(0.38268343236509f) -#define cos4Pi_8 cos2Pi_4 -#define cos5Pi_8 (-cos3Pi_8) -#define cos6Pi_8 (-cos2Pi_8) - -#define sin0Pi_8 sin0Pi -#define sin1Pi_8 cos3Pi_8 -#define sin2Pi_8 sin1Pi_4 -#define sin3Pi_8 cos1Pi_8 -#define sin4Pi_8 sin2Pi_4 -#define sin5Pi_8 sin3Pi_8 -#define sin6Pi_8 sin1Pi_4 - -#if defined(ARCH_PREFER_MULT_32x16) - #define FIXP_HYB FIXP_SGL - #define FIXP_CAST FX_DBL2FX_SGL -#else - #define FIXP_HYB FIXP_DBL - #define FIXP_CAST -#endif - -static const FIXP_HYB cr[13] = -{ - FIXP_CAST(cos6Pi_8), FIXP_CAST(cos5Pi_8), FIXP_CAST(cos4Pi_8), - FIXP_CAST(cos3Pi_8), FIXP_CAST(cos2Pi_8), FIXP_CAST(cos1Pi_8), - FIXP_CAST(cos0Pi_8), - FIXP_CAST(cos1Pi_8), FIXP_CAST(cos2Pi_8), FIXP_CAST(cos3Pi_8), - FIXP_CAST(cos4Pi_8), FIXP_CAST(cos5Pi_8), FIXP_CAST(cos6Pi_8) -}; - -static const FIXP_HYB ci[13] = -{ - FIXP_CAST( sin6Pi_8), FIXP_CAST( sin5Pi_8), FIXP_CAST( sin4Pi_8), - FIXP_CAST( sin3Pi_8), FIXP_CAST( sin2Pi_8), FIXP_CAST( sin1Pi_8), - FIXP_CAST( sin0Pi_8) , - FIXP_CAST(-sin1Pi_8), FIXP_CAST(-sin2Pi_8), FIXP_CAST(-sin3Pi_8), - FIXP_CAST(-sin4Pi_8), FIXP_CAST(-sin5Pi_8), FIXP_CAST(-sin6Pi_8) -}; - -static void slotBasedEightChannelFiltering( const FIXP_DBL *pQmfReal, - const FIXP_DBL *pQmfImag, - - FIXP_DBL *mHybridReal, - FIXP_DBL *mHybridImag) -{ - - int bin; - FIXP_DBL _fft[128 + ALIGNMENT_DEFAULT - 1]; - FIXP_DBL *fft = (FIXP_DBL *)ALIGN_PTR(_fft); - -#if defined(ARCH_PREFER_MULT_32x16) - const FIXP_SGL *p = p8_13_20; /* BASELINE_PS */ -#else - const FIXP_DBL *p = p8_13_20; /* BASELINE_PS */ -#endif - - /* pre twiddeling */ - - /* x*(a*b + c*d) = fMultDiv2(x, fMultAddDiv2(fMultDiv2(a, b), c, d)) */ - /* x*(a*b - c*d) = fMultDiv2(x, fMultSubDiv2(fMultDiv2(a, b), c, d)) */ - FIXP_DBL accu1, accu2, accu3, accu4; - - #define TWIDDLE_1(n_0,n_1,n_2) \ - cplxMultDiv2(&accu1, &accu2, pQmfReal[n_0], pQmfImag[n_0], cr[n_0], ci[n_0]); \ - accu1 = fMultDiv2(p[n_0], accu1); \ - accu2 = fMultDiv2(p[n_0], accu2); \ - cplxMultDiv2(&accu3, &accu4, pQmfReal[n_1], pQmfImag[n_1], cr[n_1], ci[n_1]); \ - accu3 = fMultDiv2(p[n_1], accu3); \ - accu4 = fMultDiv2(p[n_1], accu4); \ - fft[FIXP_FFT_IDX_R(n_2)] = accu1 + accu3; \ - fft[FIXP_FFT_IDX_I(n_2)] = accu2 + accu4; - - #define TWIDDLE_0(n_0,n_1) \ - cplxMultDiv2(&accu1, &accu2, pQmfReal[n_0], pQmfImag[n_0], cr[n_0], ci[n_0]); \ - fft[FIXP_FFT_IDX_R(n_1)] = fMultDiv2(p[n_0], accu1); \ - fft[FIXP_FFT_IDX_I(n_1)] = fMultDiv2(p[n_0], accu2); - - TWIDDLE_0( 6, 0) - TWIDDLE_0( 7, 1) - - TWIDDLE_1( 0, 8, 2) - TWIDDLE_1( 1, 9, 3) - TWIDDLE_1( 2,10, 4) - TWIDDLE_1( 3,11, 5) - TWIDDLE_1( 4,12, 6) - - TWIDDLE_0( 5, 7) - - fft_8 (fft); - - /* resort fft data into output array*/ - for(bin=0; bin<8;bin++ ) { - mHybridReal[bin] = fft[FIXP_FFT_IDX_R(bin)] << 4; - mHybridImag[bin] = fft[FIXP_FFT_IDX_I(bin)] << 4; - } -} - - -/******************************************************************************* - Functionname: fillHybridDelayLine - ******************************************************************************* - - Description: The delay line of the hybrid filter is filled and copied from - left to right. - - Return: none - -*******************************************************************************/ - -void -fillHybridDelayLine( FIXP_DBL **fixpQmfReal, /*!< Qmf real Values */ - FIXP_DBL **fixpQmfImag, /*!< Qmf imag Values */ - FIXP_DBL fixpHybridLeftR[12], /*!< Hybrid real Values left channel */ - FIXP_DBL fixpHybridLeftI[12], /*!< Hybrid imag Values left channel */ - FIXP_DBL fixpHybridRightR[12], /*!< Hybrid real Values right channel */ - FIXP_DBL fixpHybridRightI[12], /*!< Hybrid imag Values right channel */ - HANDLE_HYBRID hHybrid ) -{ - int i; - - for (i = 0; i < HYBRID_FILTER_DELAY; i++) { - slotBasedHybridAnalysis ( fixpQmfReal[i], - fixpQmfReal[i], - fixpHybridLeftR, - fixpHybridLeftI, - hHybrid ); - } - - FDKmemcpy(fixpHybridRightR, fixpHybridLeftR, sizeof(FIXP_DBL)*NO_SUB_QMF_CHANNELS); - FDKmemcpy(fixpHybridRightI, fixpHybridLeftI, sizeof(FIXP_DBL)*NO_SUB_QMF_CHANNELS); -} - - -/******************************************************************************* - Functionname: slotBasedHybridAnalysis - ******************************************************************************* - - Description: The lower QMF subbands are further split to provide better - frequency resolution for PS processing. - - Return: none - -*******************************************************************************/ - - -void -slotBasedHybridAnalysis ( FIXP_DBL *fixpQmfReal, /*!< Qmf real Values */ - FIXP_DBL *fixpQmfImag, /*!< Qmf imag Values */ - - FIXP_DBL fixpHybridReal[12], /*!< Hybrid real Values */ - FIXP_DBL fixpHybridImag[12], /*!< Hybrid imag Values */ - - HANDLE_HYBRID hHybrid) -{ - int k, band; - HYBRID_RES hybridRes; - int chOffset = 0; - - C_ALLOC_SCRATCH_START(pTempRealSlot, FIXP_DBL, 4*HYBRID_FILTER_LENGTH); - - FIXP_DBL *pTempImagSlot = pTempRealSlot + HYBRID_FILTER_LENGTH; - FIXP_DBL *pWorkRealSlot = pTempImagSlot + HYBRID_FILTER_LENGTH; - FIXP_DBL *pWorkImagSlot = pWorkRealSlot + HYBRID_FILTER_LENGTH; - - /*! - Hybrid filtering is applied to the first hHybrid->nQmfBands QMF bands (3 when 10 or 20 stereo bands - are used, 5 when 34 stereo bands are used). For the remaining QMF bands a delay would be necessary. - But there is no need to implement a delay because there is a look-ahead of HYBRID_FILTER_DELAY = 6 - QMF samples in the low-band buffer. - */ - - for(band = 0; band < hHybrid->nQmfBands; band++) { - - /* get hybrid resolution per qmf band */ - /* in case of baseline ps 10/20 band stereo mode : */ - /* */ - /* qmfBand[0] : 8 ( HYBRID_8_CPLX ) */ - /* qmfBand[1] : 2 ( HYBRID_2_REAL ) */ - /* qmfBand[2] : 2 ( HYBRID_2_REAL ) */ - /* */ - /* (split the 3 lower qmf band to 12 hybrid bands) */ - - hybridRes = (HYBRID_RES)hHybrid->pResolution[band]; - - FDKmemcpy(pWorkRealSlot, hHybrid->mQmfBufferRealSlot[band], hHybrid->qmfBufferMove * sizeof(FIXP_DBL)); - FDKmemcpy(pWorkImagSlot, hHybrid->mQmfBufferImagSlot[band], hHybrid->qmfBufferMove * sizeof(FIXP_DBL)); - - pWorkRealSlot[hHybrid->qmfBufferMove] = fixpQmfReal[band]; - pWorkImagSlot[hHybrid->qmfBufferMove] = fixpQmfImag[band]; - - FDKmemcpy(hHybrid->mQmfBufferRealSlot[band], pWorkRealSlot + 1, hHybrid->qmfBufferMove * sizeof(FIXP_DBL)); - FDKmemcpy(hHybrid->mQmfBufferImagSlot[band], pWorkImagSlot + 1, hHybrid->qmfBufferMove * sizeof(FIXP_DBL)); - - if (fixpQmfReal) { - - /* actual filtering only if output signal requested */ - switch( hybridRes ) { - - /* HYBRID_2_REAL & HYBRID_8_CPLX are only needful for baseline ps */ - case HYBRID_2_REAL: - - slotBasedDualChannelFiltering( pWorkRealSlot, - pWorkImagSlot, - pTempRealSlot, - pTempImagSlot); - break; - - case HYBRID_8_CPLX: - - slotBasedEightChannelFiltering( pWorkRealSlot, - pWorkImagSlot, - pTempRealSlot, - pTempImagSlot); - break; - - default: - FDK_ASSERT(0); - } - - for(k = 0; k < (SCHAR)hybridRes; k++) { - fixpHybridReal [chOffset + k] = pTempRealSlot[k]; - fixpHybridImag [chOffset + k] = pTempImagSlot[k]; - } - chOffset += hybridRes; - } /* if (mHybridReal) */ - } - - /* group hybrid channels 3+4 -> 3 and 2+5 -> 2 */ - fixpHybridReal[3] += fixpHybridReal[4]; - fixpHybridImag[3] += fixpHybridImag[4]; - fixpHybridReal[4] = (FIXP_DBL)0; - fixpHybridImag[4] = (FIXP_DBL)0; - - fixpHybridReal[2] += fixpHybridReal[5]; - fixpHybridImag[2] += fixpHybridImag[5]; - fixpHybridReal[5] = (FIXP_DBL)0; - fixpHybridImag[5] = (FIXP_DBL)0; - - /* free memory on scratch */ - C_ALLOC_SCRATCH_END(pTempRealSlot, FIXP_DBL, 4*HYBRID_FILTER_LENGTH); - -} - - -/******************************************************************************* - Functionname: slotBasedHybridSynthesis - ******************************************************************************* - - Description: The coefficients offering higher resolution for the lower QMF - channel are simply added prior to the synthesis with the 54 - subbands QMF. - - Arguments: - - Return: none - -*******************************************************************************/ - -/*! <pre> - l,r0(n) ---\ - l,r1(n) ---- + --\ - l,r2(n) ---/ \ - + --> F0(w) - l,r3(n) ---\ / - l,r4(n) ---- + --/ - l,r5(n) ---/ - - - l,r6(n) ---\ - + ---------> F1(w) - l,r7(n) ---/ - - - l,r8(n) ---\ - + ---------> F2(w) - l,r9(n) ---/ - - </pre> - Hybrid QMF synthesis filterbank for the 10 and 20 stereo-bands configurations. The - coefficients offering higher resolution for the lower QMF channel are simply added - prior to the synthesis with the 54 subbands QMF. - - [see ISO/IEC 14496-3:2001/FDAM 2:2004(E) - Page 52] -*/ - - -void -slotBasedHybridSynthesis ( FIXP_DBL *fixpHybridReal, /*!< Hybrid real Values */ - FIXP_DBL *fixpHybridImag, /*!< Hybrid imag Values */ - FIXP_DBL *fixpQmfReal, /*!< Qmf real Values */ - FIXP_DBL *fixpQmfImag, /*!< Qmf imag Values */ - HANDLE_HYBRID hHybrid ) /*!< Handle to HYBRID struct. */ -{ - int k, band; - - HYBRID_RES hybridRes; - int chOffset = 0; - - for(band = 0; band < hHybrid->nQmfBands; band++) { - - FIXP_DBL qmfReal = FL2FXCONST_DBL(0.f); - FIXP_DBL qmfImag = FL2FXCONST_DBL(0.f); - hybridRes = (HYBRID_RES)hHybrid->pResolution[band]; - - for(k = 0; k < (SCHAR)hybridRes; k++) { - qmfReal += fixpHybridReal[chOffset + k]; - qmfImag += fixpHybridImag[chOffset + k]; - } - - fixpQmfReal[band] = qmfReal; - fixpQmfImag[band] = qmfImag; - - chOffset += hybridRes; - } -} - - - |