| /* ------------------------------------------------------------------ |
| * 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_all_pass_fract_delay_filter.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 |
| ----------------------------------------------------------------------------*/ |
| |
| /*---------------------------------------------------------------------------- |
| ; 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 |
| ----------------------------------------------------------------------------*/ |
| |
| /* |
| * For lower subbands |
| * Apply all-pass filtering |
| * |
| */ |
| |
| |
| void ps_all_pass_fract_delay_filter_type_I(UInt32 *delayBufIndex, |
| Int32 sb_delay, |
| const Int32 *ppFractDelayPhaseFactorSer, |
| Int32 ***pppRealDelayRBufferSer, |
| Int32 ***pppImagDelayRBufferSer, |
| Int32 *rIn, |
| Int32 *iIn) |
| { |
| |
| Int32 cmplx; |
| Int16 rTmp0; |
| Int32 rTmp; |
| Int32 iTmp; |
| Int32 *pt_rTmp; |
| Int32 *pt_iTmp; |
| |
| |
| |
| /* |
| * All pass filters |
| * 2 |
| * ___ Q_fract(k,m)*z^(-d(m)) - a(m)*g_decay_slope(k) |
| * z^(-2)*phi_fract(k)* | | ------------------------------------------------ |
| * m=0 1 - a(m)*g_decay_slope(k)*Q_fract(k,m)*z^(-d(m)) |
| * |
| * |
| * Fractional delay matrix: |
| * |
| * Q_fract(k,m) = exp(-j*pi*q(m)*f_center(k)) 0<= k <= SUBQMF_GROUPS |
| * |
| * Vectors: a(m), q(m), d(m) are constants |
| * |
| * m m 0 1 2 |
| * ------------------------------- |
| * delay length d(m) == 3 4 5 (Fs > 32 KHz) |
| * fractional delay length q(m) == 0.43 0.75 0.347 |
| * filter coefficient a(m) == 0.65144 0.56472 0.48954 |
| * |
| * g_decay_slope(k) is given |
| */ |
| |
| |
| Int32 tmp_r; |
| Int32 tmp_i; |
| |
| pt_rTmp = &pppRealDelayRBufferSer[0][*(delayBufIndex)][sb_delay]; |
| pt_iTmp = &pppImagDelayRBufferSer[0][*(delayBufIndex++)][sb_delay]; |
| |
| cmplx = *(ppFractDelayPhaseFactorSer++); /* Q_fract(k,m) */ |
| tmp_r = *pt_rTmp << 1; |
| tmp_i = *pt_iTmp << 1; |
| |
| rTmp = cmplx_mul32_by_16(tmp_r, -tmp_i, cmplx); |
| rTmp0 = Qfmt15(0.65143905753106f); |
| iTmp = cmplx_mul32_by_16(tmp_i, tmp_r, cmplx); |
| |
| |
| iTmp = fxp_mac32_by_16(-*iIn << 1, rTmp0, iTmp); /* Q_fract(k,m)*y(n-1) - a(m)*g_decay_slope(k)*x(n) */ |
| *pt_iTmp = fxp_mac32_by_16(iTmp << 1, rTmp0, *iIn); /* y(n) = x(n) + a(m)*g_decay_slope(k)*( Q_fract(k,m)*y(n-1) - a(m)*g_decay_slope(k)*x(n)) */ |
| *iIn = iTmp; |
| |
| rTmp = fxp_mac32_by_16(-*rIn << 1, rTmp0, rTmp); |
| *pt_rTmp = fxp_mac32_by_16(rTmp << 1, rTmp0, *rIn); |
| |
| *rIn = rTmp; |
| |
| pt_rTmp = &pppRealDelayRBufferSer[1][*(delayBufIndex)][sb_delay]; |
| pt_iTmp = &pppImagDelayRBufferSer[1][*(delayBufIndex++)][sb_delay]; |
| |
| |
| |
| cmplx = *(ppFractDelayPhaseFactorSer++); /* Q_fract(k,m) */ |
| tmp_r = *pt_rTmp << 1; |
| tmp_i = *pt_iTmp << 1; |
| |
| rTmp = cmplx_mul32_by_16(tmp_r, -tmp_i, cmplx); |
| rTmp0 = Qfmt15(0.56471812200776f); |
| iTmp = cmplx_mul32_by_16(tmp_i, tmp_r, cmplx); |
| |
| |
| iTmp = fxp_mac32_by_16(-*iIn << 1, rTmp0, iTmp); /* Q_fract(k,m)*y(n-1) - a(m)*g_decay_slope(k)*x(n) */ |
| *pt_iTmp = fxp_mac32_by_16(iTmp << 1, rTmp0, *iIn); /* y(n) = x(n) + a(m)*g_decay_slope(k)*( Q_fract(k,m)*y(n-1) - a(m)*g_decay_slope(k)*x(n)) */ |
| *iIn = iTmp; |
| |
| rTmp = fxp_mac32_by_16(-*rIn << 1, rTmp0, rTmp); |
| *pt_rTmp = fxp_mac32_by_16(rTmp << 1, rTmp0, *rIn); |
| *rIn = rTmp; |
| |
| pt_rTmp = &pppRealDelayRBufferSer[2][*(delayBufIndex)][sb_delay]; |
| pt_iTmp = &pppImagDelayRBufferSer[2][*(delayBufIndex)][sb_delay]; |
| |
| |
| cmplx = *(ppFractDelayPhaseFactorSer); /* Q_fract(k,m) */ |
| tmp_r = *pt_rTmp << 1; |
| tmp_i = *pt_iTmp << 1; |
| |
| rTmp = cmplx_mul32_by_16(tmp_r, -tmp_i, cmplx); |
| rTmp0 = Qfmt15(0.97908331911390f); |
| iTmp = cmplx_mul32_by_16(tmp_i, tmp_r, cmplx); |
| |
| |
| iTmp = fxp_mac32_by_16(-*iIn, rTmp0, iTmp); /* Q_fract(k,m)*y(n-1) - a(m)*g_decay_slope(k)*x(n) */ |
| *pt_iTmp = fxp_mac32_by_16(iTmp, rTmp0, *iIn); /* y(n) = x(n) + a(m)*g_decay_slope(k)*( Q_fract(k,m)*y(n-1) - a(m)*g_decay_slope(k)*x(n)) */ |
| *iIn = iTmp << 2; |
| |
| rTmp = fxp_mac32_by_16(-*rIn, rTmp0, rTmp); |
| *pt_rTmp = fxp_mac32_by_16(rTmp, rTmp0, *rIn); |
| *rIn = rTmp << 2; |
| } |
| |
| |
| void ps_all_pass_fract_delay_filter_type_II(UInt32 *delayBufIndex, |
| Int32 sb_delay, |
| const Int32 *ppFractDelayPhaseFactorSer, |
| Int32 ***pppRealDelayRBufferSer, |
| Int32 ***pppImagDelayRBufferSer, |
| Int32 *rIn, |
| Int32 *iIn, |
| Int32 decayScaleFactor) |
| { |
| |
| Int32 cmplx; |
| Int16 rTmp0; |
| Int32 rTmp; |
| Int32 iTmp; |
| Int32 *pt_rTmp; |
| Int32 *pt_iTmp; |
| const Int16 *pt_delay; |
| |
| |
| |
| /* |
| * All pass filters |
| * 2 |
| * ___ Q_fract(k,m)*z^(-d(m)) - a(m)*g_decay_slope(k) |
| * z^(-2)*phi_fract(k)* | | ------------------------------------------------ |
| * m=0 1 - a(m)*g_decay_slope(k)*Q_fract(k,m)*z^(-d(m)) |
| * |
| * |
| * Fractional delay matrix: |
| * |
| * Q_fract(k,m) = exp(-j*pi*q(m)*f_center(k)) 0<= k <= SUBQMF_GROUPS |
| * |
| * Vectors: a(m), q(m), d(m) are constants |
| * |
| * m m 0 1 2 |
| * ------------------------------- |
| * delay length d(m) == 3 4 5 (Fs > 32 KHz) |
| * fractional delay length q(m) == 0.43 0.75 0.347 |
| * filter coefficient a(m) == 0.65144 0.56472 0.48954 |
| * |
| * g_decay_slope(k) is given |
| */ |
| |
| |
| Int32 tmp_r; |
| Int32 tmp_i; |
| |
| pt_rTmp = &pppRealDelayRBufferSer[0][*(delayBufIndex)][sb_delay]; |
| pt_iTmp = &pppImagDelayRBufferSer[0][*(delayBufIndex++)][sb_delay]; |
| |
| cmplx = *(ppFractDelayPhaseFactorSer++); /* Q_fract(k,m) */ |
| pt_delay = aRevLinkDecaySerCoeff[decayScaleFactor]; |
| tmp_r = *pt_rTmp << 1; |
| tmp_i = *pt_iTmp << 1; |
| |
| rTmp = cmplx_mul32_by_16(tmp_r, -tmp_i, cmplx); |
| rTmp0 = *(pt_delay++); |
| iTmp = cmplx_mul32_by_16(tmp_i, tmp_r, cmplx); |
| |
| |
| iTmp = fxp_mac32_by_16(-*iIn << 1, rTmp0, iTmp); /* Q_fract(k,m)*y(n-1) - a(m)*g_decay_slope(k)*x(n) */ |
| *pt_iTmp = fxp_mac32_by_16(iTmp << 1, rTmp0, *iIn); /* y(n) = x(n) + a(m)*g_decay_slope(k)*( Q_fract(k,m)*y(n-1) - a(m)*g_decay_slope(k)*x(n)) */ |
| *iIn = iTmp; |
| |
| rTmp = fxp_mac32_by_16(-*rIn << 1, rTmp0, rTmp); |
| *pt_rTmp = fxp_mac32_by_16(rTmp << 1, rTmp0, *rIn); |
| *rIn = rTmp; |
| |
| pt_rTmp = &pppRealDelayRBufferSer[1][*(delayBufIndex)][sb_delay]; |
| pt_iTmp = &pppImagDelayRBufferSer[1][*(delayBufIndex++)][sb_delay]; |
| |
| |
| cmplx = *(ppFractDelayPhaseFactorSer++); /* Q_fract(k,m) */ |
| tmp_r = *pt_rTmp << 1; |
| tmp_i = *pt_iTmp << 1; |
| |
| rTmp = cmplx_mul32_by_16(tmp_r, -tmp_i, cmplx); |
| rTmp0 = *(pt_delay++); |
| iTmp = cmplx_mul32_by_16(tmp_i, tmp_r, cmplx); |
| iTmp = fxp_mac32_by_16(-*iIn << 1, rTmp0, iTmp); /* Q_fract(k,m)*y(n-1) - a(m)*g_decay_slope(k)*x(n) */ |
| *pt_iTmp = fxp_mac32_by_16(iTmp << 1, rTmp0, *iIn); /* y(n) = x(n) + a(m)*g_decay_slope(k)*( Q_fract(k,m)*y(n-1) - a(m)*g_decay_slope(k)*x(n)) */ |
| *iIn = iTmp; |
| |
| rTmp = fxp_mac32_by_16(-*rIn << 1, rTmp0, rTmp); |
| *pt_rTmp = fxp_mac32_by_16(rTmp << 1, rTmp0, *rIn); |
| *rIn = rTmp; |
| |
| pt_rTmp = &pppRealDelayRBufferSer[2][*(delayBufIndex)][sb_delay]; |
| pt_iTmp = &pppImagDelayRBufferSer[2][*(delayBufIndex)][sb_delay]; |
| |
| |
| cmplx = *(ppFractDelayPhaseFactorSer); /* Q_fract(k,m) */ |
| tmp_r = *pt_rTmp << 1; |
| tmp_i = *pt_iTmp << 1; |
| |
| rTmp = cmplx_mul32_by_16(tmp_r, -tmp_i, cmplx); |
| rTmp0 = *(pt_delay); |
| iTmp = cmplx_mul32_by_16(tmp_i, tmp_r, cmplx); |
| |
| |
| iTmp = fxp_mac32_by_16(-*iIn, rTmp0, iTmp); /* Q_fract(k,m)*y(n-1) - a(m)*g_decay_slope(k)*x(n) */ |
| *pt_iTmp = fxp_mac32_by_16(iTmp, rTmp0, *iIn); /* y(n) = x(n) + a(m)*g_decay_slope(k)*( Q_fract(k,m)*y(n-1) - a(m)*g_decay_slope(k)*x(n)) */ |
| *iIn = iTmp << 2; |
| |
| rTmp = fxp_mac32_by_16(-*rIn, rTmp0, rTmp); |
| *pt_rTmp = fxp_mac32_by_16(rTmp, rTmp0, *rIn); |
| *rIn = rTmp << 2; |
| |
| } |
| |
| |
| |
| #endif |
| |
| |
| #endif |
| |
