| /* ------------------------------------------------------------------ |
| * 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 |
| |
