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Diffstat (limited to 'media/libstagefright/codecs/aacdec/ps_decorrelate.cpp')
| -rw-r--r-- | media/libstagefright/codecs/aacdec/ps_decorrelate.cpp | 499 |
1 files changed, 499 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/aacdec/ps_decorrelate.cpp b/media/libstagefright/codecs/aacdec/ps_decorrelate.cpp new file mode 100644 index 0000000..6776d6e --- /dev/null +++ b/media/libstagefright/codecs/aacdec/ps_decorrelate.cpp @@ -0,0 +1,499 @@ +/* ------------------------------------------------------------------ + * Copyright (C) 1998-2009 PacketVideo + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either + * express or implied. + * See the License for the specific language governing permissions + * and limitations under the License. + * ------------------------------------------------------------------- + */ +/* + + Filename: ps_decorrelate.c + +------------------------------------------------------------------------------ + REVISION HISTORY + + + Who: Date: MM/DD/YYYY + Description: + +------------------------------------------------------------------------------ + INPUT AND OUTPUT DEFINITIONS + + + +------------------------------------------------------------------------------ + FUNCTION DESCRIPTION + + Decorrelation + Decorrelation is achieved by means of all-pass filtering and delaying + Sub-band samples s_k(n) are converted into de-correlated sub-bands samples + d_k(n). k index for frequency, n time index + + + _______ ________ + | | _______ | | + ->|Hybrid | LF ---- | |->| Hybrid |--> + | Anal. | | | | | Synth | QMF -> L + ------- o----------------------->| | -------- Synth +QMF | s_k(n) |Stereo |--------------> +Anal. -------------------------->| | + _______ | | | | ________ + | | HF --o | ----------- |Process| | | + ->| Delay | | ->| |-------->| |->| Hybrid |--> + ------- | |decorrelate| d_k(n) | | | Synth | QMF -> R + ---->| |-------->| | -------- Synth + ----------- |_______|--------------> + + + Delay is introduced to compensate QMF bands not passed through Hybrid + Analysis + +------------------------------------------------------------------------------ + REQUIREMENTS + + +------------------------------------------------------------------------------ + REFERENCES + +SC 29 Software Copyright Licencing Disclaimer: + +This software module was originally developed by + Coding Technologies + +and edited by + - + +in the course of development of the ISO/IEC 13818-7 and ISO/IEC 14496-3 +standards for reference purposes and its performance may not have been +optimized. This software module is an implementation of one or more tools as +specified by the ISO/IEC 13818-7 and ISO/IEC 14496-3 standards. +ISO/IEC gives users free license to this software module or modifications +thereof for use in products claiming conformance to audiovisual and +image-coding related ITU Recommendations and/or ISO/IEC International +Standards. ISO/IEC gives users the same free license to this software module or +modifications thereof for research purposes and further ISO/IEC standardisation. +Those intending to use this software module in products are advised that its +use may infringe existing patents. ISO/IEC have no liability for use of this +software module or modifications thereof. Copyright is not released for +products that do not conform to audiovisual and image-coding related ITU +Recommendations and/or ISO/IEC International Standards. +The original developer retains full right to modify and use the code for its +own purpose, assign or donate the code to a third party and to inhibit third +parties from using the code for products that do not conform to audiovisual and +image-coding related ITU Recommendations and/or ISO/IEC International Standards. +This copyright notice must be included in all copies or derivative works. +Copyright (c) ISO/IEC 2003. + +------------------------------------------------------------------------------ + PSEUDO-CODE + +------------------------------------------------------------------------------ +*/ + + +/*---------------------------------------------------------------------------- +; INCLUDES +----------------------------------------------------------------------------*/ + +#ifdef AAC_PLUS + +#ifdef PARAMETRICSTEREO +#include "pv_audio_type_defs.h" +#include "ps_decorrelate.h" +#include "aac_mem_funcs.h" +#include "ps_all_pass_filter_coeff.h" +#include "ps_pwr_transient_detection.h" +#include "ps_all_pass_fract_delay_filter.h" +#include "fxp_mul32.h" + +/*---------------------------------------------------------------------------- +; MACROS +; Define module specific macros here +----------------------------------------------------------------------------*/ + +#ifndef min +#define min(a, b) ((a) < (b) ? (a) : (b)) +#endif + + +/*---------------------------------------------------------------------------- +; DEFINES +; Include all pre-processor statements here. Include conditional +; compile variables also. +----------------------------------------------------------------------------*/ + +/*---------------------------------------------------------------------------- +; LOCAL FUNCTION DEFINITIONS +; Function Prototype declaration +----------------------------------------------------------------------------*/ + + +/*---------------------------------------------------------------------------- +; LOCAL STORE/BUFFER/POINTER DEFINITIONS +; Variable declaration - defined here and used outside this module +----------------------------------------------------------------------------*/ + + +/*---------------------------------------------------------------------------- +; EXTERNAL FUNCTION REFERENCES +; Declare functions defined elsewhere and referenced in this module +----------------------------------------------------------------------------*/ + + + + +/*---------------------------------------------------------------------------- +; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES +; Declare variables used in this module but defined elsewhere +----------------------------------------------------------------------------*/ + + +/*---------------------------------------------------------------------------- +; FUNCTION CODE +----------------------------------------------------------------------------*/ +void ps_decorrelate(STRUCT_PS_DEC *h_ps_dec, + Int32 *rIntBufferLeft, + Int32 *iIntBufferLeft, + Int32 *rIntBufferRight, + Int32 *iIntBufferRight, + Int32 scratch_mem[]) +{ + Int32 sb; + Int32 maxsb; + Int32 gr; + Int32 sb_delay; + Int32 bin; + + + + + Int32 *aLeftReal; + Int32 *aLeftImag; + Int32 *aRightReal; + Int32 *aRightImag; + + Int32 *aTransRatio = scratch_mem; /* use NO_BINS == 20 */ + + + Int32 ***pppRealDelayRBufferSer; + Int32 ***pppImagDelayRBufferSer; + + Int32 **ppRealDelayBuffer; + Int32 **ppImagDelayBuffer; + + const Int32(*ppFractDelayPhaseFactorSer)[3]; + /* + * Power transient estimation and detection + */ + + + ps_pwr_transient_detection(h_ps_dec, + rIntBufferLeft, + iIntBufferLeft, + aTransRatio); + + + aLeftReal = h_ps_dec->mHybridRealLeft; + aLeftImag = h_ps_dec->mHybridImagLeft; + aRightReal = h_ps_dec->mHybridRealRight; + aRightImag = h_ps_dec->mHybridImagRight; + + pppRealDelayRBufferSer = h_ps_dec->aaaRealDelayRBufferSerSubQmf; + pppImagDelayRBufferSer = h_ps_dec->aaaImagDelayRBufferSerSubQmf; + + ppRealDelayBuffer = h_ps_dec->aaRealDelayBufferSubQmf; + ppImagDelayBuffer = h_ps_dec->aaImagDelayBufferSubQmf; + + + + ppFractDelayPhaseFactorSer = aaFractDelayPhaseFactorSerSubQmf; + + + /* + * NO_IID_GROUPS (SUBQMF_GROUPS (12) + QMF_GROUPS (10)) == 22 + */ + + for (gr = 0; gr < SUBQMF_GROUPS; gr++) /* 0 to 9 */ + { + Int32 rIn; + Int32 iIn; + Int32 *pt_rTmp; + Int32 *pt_iTmp; + Int32 rTmp; + Int32 cmplx; + Int32 tmp1, tmp2; + + /* sb = subQMF/QMF subband */ + + sb = groupBorders[gr]; + + /* + * For lower subbands + * Apply all-pass filtering + * + */ + pt_rTmp = &ppRealDelayBuffer[sb][h_ps_dec->delayBufIndex]; + pt_iTmp = &ppImagDelayBuffer[sb][h_ps_dec->delayBufIndex]; + + tmp1 = aLeftReal[sb]; + tmp2 = aLeftImag[sb]; + rIn = *pt_rTmp >> 1; + iIn = *pt_iTmp >> 1; + + + *pt_rTmp = tmp1; + *pt_iTmp = tmp2; + + /* + * Fractional delay vector + * + * phi_fract(k) = exp(-j*pi*q_phi*f_center(k)) 0<= k <= SUBQMF_GROUPS + * + * q_phi = 0.39 + * f_center(k) frequency vector + */ + + cmplx = aFractDelayPhaseFactorSubQmf[sb]; + + aRightReal[sb] = cmplx_mul32_by_16(rIn, -iIn, cmplx); + aRightImag[sb] = cmplx_mul32_by_16(iIn, rIn, cmplx); + + ps_all_pass_fract_delay_filter_type_I(h_ps_dec->aDelayRBufIndexSer, + sb, + ppFractDelayPhaseFactorSer[sb], + pppRealDelayRBufferSer, + pppImagDelayRBufferSer, + &aRightReal[sb], + &aRightImag[sb]); + + bin = bins2groupMap[gr]; + rTmp = aTransRatio[bin]; + + if (rTmp != 0x7FFFFFFF) + { + aRightReal[sb] = fxp_mul32_Q31(rTmp, aRightReal[sb]) << 1; + aRightImag[sb] = fxp_mul32_Q31(rTmp, aRightImag[sb]) << 1; + } + + + } /* gr */ + + aLeftReal = rIntBufferLeft; + aLeftImag = iIntBufferLeft; + aRightReal = rIntBufferRight; + aRightImag = iIntBufferRight; + + pppRealDelayRBufferSer = h_ps_dec->aaaRealDelayRBufferSerQmf; + pppImagDelayRBufferSer = h_ps_dec->aaaImagDelayRBufferSerQmf; + + ppRealDelayBuffer = h_ps_dec->aaRealDelayBufferQmf; + ppImagDelayBuffer = h_ps_dec->aaImagDelayBufferQmf; + + + + ppFractDelayPhaseFactorSer = aaFractDelayPhaseFactorSerQmf; + + + for (gr = SUBQMF_GROUPS; gr < NO_BINS; gr++) /* 10 to 20 */ + { + + maxsb = min(h_ps_dec->usb, groupBorders[gr+1]); + + /* sb = subQMF/QMF subband */ + + for (sb = groupBorders[gr]; sb < maxsb; sb++) + { + + Int32 rIn, iIn; + Int32 *pt_rTmp, *pt_iTmp; + Int32 cmplx; + Int32 tmp1, tmp2; + Int32 rTmp; + + + sb_delay = sb - NO_QMF_CHANNELS_IN_HYBRID; /* NO_QMF_CHANNELS_IN_HYBRID == 3 */ + + /* + * For lower subbands + * Apply all-pass filtering + * + */ + pt_rTmp = &ppRealDelayBuffer[sb_delay][h_ps_dec->delayBufIndex]; + pt_iTmp = &ppImagDelayBuffer[sb_delay][h_ps_dec->delayBufIndex]; + + rIn = *pt_rTmp >> 1; + iIn = *pt_iTmp >> 1; + + tmp1 = aLeftReal[sb]; + tmp2 = aLeftImag[sb]; + *pt_rTmp = tmp1; + *pt_iTmp = tmp2; + + /* + * Fractional delay vector + * + * phi_fract(k) = exp(-j*pi*q_phi*f_center(k)) 0<= k <= SUBQMF_GROUPS + * + * q_phi = 0.39 + * f_center(k) frequency vector + */ + + cmplx = aFractDelayPhaseFactor[sb_delay]; + aRightReal[sb] = cmplx_mul32_by_16(rIn, -iIn, cmplx); + aRightImag[sb] = cmplx_mul32_by_16(iIn, rIn, cmplx); + + ps_all_pass_fract_delay_filter_type_II(h_ps_dec->aDelayRBufIndexSer, + sb_delay, + ppFractDelayPhaseFactorSer[sb_delay], + pppRealDelayRBufferSer, + pppImagDelayRBufferSer, + &aRightReal[sb], + &aRightImag[sb], + sb); + + rTmp = aTransRatio[gr-2]; + if (rTmp != 0x7FFFFFFF) + { + aRightReal[sb] = fxp_mul32_Q31(rTmp, aRightReal[sb]) << 1; + aRightImag[sb] = fxp_mul32_Q31(rTmp, aRightImag[sb]) << 1; + } + + + } /* sb */ + + } + + + maxsb = min(h_ps_dec->usb, 35); /* 35 == groupBorders[NO_BINS + 1] */ + + /* sb = subQMF/QMF subband */ + { + Int32 factor = aTransRatio[NO_BINS-2]; + + for (sb = 23; sb < maxsb; sb++) /* 23 == groupBorders[NO_BINS] */ + { + + Int32 tmp, tmp2; + Int32 *pt_rTmp, *pt_iTmp; + + sb_delay = sb - NO_QMF_CHANNELS_IN_HYBRID; /* == 3 */ + + /* + * For the Upper Bands apply delay only + * -D(k) + * Apply Delay H_k(z) = z , D(k) == 1 or 14 + * + */ + Int32 k = sb - NO_ALLPASS_CHANNELS; /* == 23 */ + + + pt_rTmp = &ppRealDelayBuffer[sb_delay][h_ps_dec->aDelayBufIndex[ k]]; + pt_iTmp = &ppImagDelayBuffer[sb_delay][h_ps_dec->aDelayBufIndex[ k]]; + + if (++h_ps_dec->aDelayBufIndex[ k] >= LONG_DELAY) /* == 14 */ + { + h_ps_dec->aDelayBufIndex[ k] = 0; + } + + + tmp = *pt_rTmp; + tmp2 = *pt_iTmp; + + if (aTransRatio[NO_BINS-2] < 0x7FFFFFFF) + { + aRightReal[sb] = fxp_mul32_Q31(factor, tmp) << 1; + aRightImag[sb] = fxp_mul32_Q31(factor, tmp2) << 1; + } + else + { + aRightReal[sb] = tmp; + aRightImag[sb] = tmp2; + } + + + tmp = aLeftReal[sb]; + tmp2 = aLeftImag[sb]; + *pt_rTmp = tmp; + *pt_iTmp = tmp2; + + + } /* sb */ + } + + + maxsb = min(h_ps_dec->usb, 64); /* 64 == groupBorders[NO_BINS+2] */ + + /* sb = subQMF/QMF subband */ + + { + + for (sb = 35; sb < maxsb; sb++) /* 35 == groupBorders[NO_BINS+1] */ + { + + Int32 *pt_rTmp, *pt_iTmp; + + sb_delay = sb - NO_QMF_CHANNELS_IN_HYBRID; /* == 3 */ + + /* + * For the Upper Bands apply delay only + * -D(k) + * Apply Delay H_k(z) = z , D(k) == 1 or 14 + * + */ + + pt_rTmp = &ppRealDelayBuffer[sb_delay][0]; + pt_iTmp = &ppImagDelayBuffer[sb_delay][0]; + + aRightReal[sb] = *pt_rTmp; + aRightImag[sb] = *pt_iTmp; + + + if (aTransRatio[NO_BINS-1] < 0x7FFFFFFF) + { + aRightReal[sb] = fxp_mul32_Q31(aTransRatio[NO_BINS-1], aRightReal[sb]) << 1; + aRightImag[sb] = fxp_mul32_Q31(aTransRatio[NO_BINS-1], aRightImag[sb]) << 1; + } + + *pt_rTmp = aLeftReal[sb]; + *pt_iTmp = aLeftImag[sb]; + + + } /* sb */ + } + + + if (++h_ps_dec->delayBufIndex >= DELAY_ALLPASS) + { + h_ps_dec->delayBufIndex = 0; + } + + if (++h_ps_dec->aDelayRBufIndexSer[0] >= 3) + { + h_ps_dec->aDelayRBufIndexSer[0] = 0; + } + if (++h_ps_dec->aDelayRBufIndexSer[1] >= 4) + { + h_ps_dec->aDelayRBufIndexSer[1] = 0; + } + if (++h_ps_dec->aDelayRBufIndexSer[2] >= 5) + { + h_ps_dec->aDelayRBufIndexSer[2] = 0; + } + + +} /* END deCorrelate */ +#endif + + +#endif + |