| /* ------------------------------------------------------------------ |
| * 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_pwr_transient_detection.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 |
| ----------- |_______|--------------> |
| |
| |
| To handle transients and other fast time-envelopes, the output of the all |
| pass filters has to be attenuated at those signals. |
| |
| |
| ------------------------------------------------------------------------------ |
| 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 "s_ps_dec.h" |
| #include "aac_mem_funcs.h" |
| #include "ps_all_pass_filter_coeff.h" |
| #include "ps_pwr_transient_detection.h" |
| |
| #include "fxp_mul32.h" |
| #include "pv_div.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. |
| ----------------------------------------------------------------------------*/ |
| |
| #define R_SHIFT 29 |
| #define Q29_fmt(x) (Int32)(x*((Int32)1<<R_SHIFT) + (x>=0?0.5F:-0.5F)) |
| |
| #define Qfmt31(a) (Int32)(-a*((Int32)1<<31) - 1 + (a>=0?0.5F:-0.5F)) |
| |
| /*---------------------------------------------------------------------------- |
| ; 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_pwr_transient_detection(STRUCT_PS_DEC *h_ps_dec, |
| Int32 *rIntBufferLeft, |
| Int32 *iIntBufferLeft, |
| Int32 aTransRatio[]) |
| { |
| |
| Int32 sb; |
| Int32 maxsb; |
| Int32 gr; |
| Int32 bin; |
| |
| |
| |
| Int32 *aLeftReal; |
| Int32 *aLeftImag; |
| Int32 temp_r; |
| Int32 temp_i; |
| Int32 accu; |
| Int32 *aPower = aTransRatio; |
| Quotient result; |
| |
| Int32 nrg; |
| Int32 *ptr_aPrevNrg; |
| Int32 peakDiff; |
| Int32 *ptr_PrevPeakDiff; |
| |
| |
| aLeftReal = rIntBufferLeft; |
| aLeftImag = iIntBufferLeft; |
| |
| /* |
| * Input Power Matrix |
| * 2 |
| * Power(i,n) = SUM | s_k(n)| |
| * i |
| */ |
| |
| for (gr = SUBQMF_GROUPS; gr < NO_IID_GROUPS; gr++) /* 10 to 22 */ |
| { |
| maxsb = min(h_ps_dec->usb, groupBorders[ gr+1]); |
| |
| accu = 0; |
| |
| for (sb = groupBorders[gr]; sb < maxsb; sb++) |
| { |
| |
| temp_r = aLeftReal[sb]; |
| temp_i = aLeftImag[sb]; |
| accu = fxp_mac32_Q31(accu, temp_r, temp_r); |
| accu = fxp_mac32_Q31(accu, temp_i, temp_i); |
| |
| } /* sb */ |
| aPower[gr - 2] = accu >> 1; |
| } /* gr */ |
| |
| aLeftReal = h_ps_dec->mHybridRealLeft; |
| aLeftImag = h_ps_dec->mHybridImagLeft; |
| |
| |
| temp_r = aLeftReal[0]; |
| temp_i = aLeftImag[0]; |
| accu = fxp_mul32_Q31(temp_r, temp_r); |
| accu = fxp_mac32_Q31(accu, temp_i, temp_i); |
| temp_r = aLeftReal[5]; |
| temp_i = aLeftImag[5]; |
| accu = fxp_mac32_Q31(accu, temp_r, temp_r); |
| aPower[0] = fxp_mac32_Q31(accu, temp_i, temp_i) >> 1; |
| |
| temp_r = aLeftReal[1]; |
| temp_i = aLeftImag[1]; |
| accu = fxp_mul32_Q31(temp_r, temp_r); |
| accu = fxp_mac32_Q31(accu, temp_i, temp_i); |
| temp_r = aLeftReal[4]; |
| temp_i = aLeftImag[4]; |
| accu = fxp_mac32_Q31(accu, temp_r, temp_r); |
| aPower[1] = fxp_mac32_Q31(accu, temp_i, temp_i) >> 1; |
| |
| temp_r = aLeftReal[2]; |
| temp_i = aLeftImag[2]; |
| accu = fxp_mul32_Q31(temp_r, temp_r); |
| aPower[2] = fxp_mac32_Q31(accu, temp_i, temp_i) >> 1; |
| |
| temp_r = aLeftReal[3]; |
| temp_i = aLeftImag[3]; |
| accu = fxp_mul32_Q31(temp_r, temp_r); |
| aPower[3] = fxp_mac32_Q31(accu, temp_i, temp_i) >> 1; |
| |
| |
| |
| temp_r = aLeftReal[6]; |
| temp_i = aLeftImag[6]; |
| accu = fxp_mul32_Q31(temp_r, temp_r); |
| aPower[5] = fxp_mac32_Q31(accu, temp_i, temp_i) >> 1; |
| |
| temp_r = aLeftReal[7]; |
| temp_i = aLeftImag[7]; |
| accu = fxp_mul32_Q31(temp_r, temp_r); |
| aPower[4] = fxp_mac32_Q31(accu, temp_i, temp_i) >> 1; |
| |
| temp_r = aLeftReal[8]; |
| temp_i = aLeftImag[8]; |
| accu = fxp_mul32_Q31(temp_r, temp_r); |
| aPower[6] = fxp_mac32_Q31(accu, temp_i, temp_i) >> 1; |
| |
| temp_r = aLeftReal[9]; |
| temp_i = aLeftImag[9]; |
| accu = fxp_mul32_Q31(temp_r, temp_r); |
| aPower[7] = fxp_mac32_Q31(accu, temp_i, temp_i) >> 1; |
| |
| |
| /* |
| * Power transient detection |
| */ |
| |
| ptr_aPrevNrg = h_ps_dec->aPrevNrg; |
| |
| ptr_PrevPeakDiff = h_ps_dec->aPrevPeakDiff; |
| |
| for (bin = 0; bin < NO_BINS; bin++) /* NO_BINS = 20 */ |
| { |
| |
| peakDiff = *ptr_PrevPeakDiff; |
| |
| |
| /* PEAK_DECAY_FACTOR 0.765928338364649f @ 48 KHz for Fs > 32 Khz */ |
| accu = h_ps_dec->aPeakDecayFast[bin]; |
| peakDiff -= peakDiff >> 2; |
| |
| accu = fxp_mul32_Q31(accu, Qfmt31(0.765928338364649f)) << 1; |
| |
| if (accu < *aPower) |
| { |
| accu = *aPower; |
| } |
| else |
| { |
| peakDiff += ((accu - *aPower) >> 2); |
| } |
| |
| h_ps_dec->aPeakDecayFast[bin] = accu; |
| |
| *(ptr_PrevPeakDiff++) = peakDiff; |
| |
| nrg = *ptr_aPrevNrg + ((*aPower - *ptr_aPrevNrg) >> 2); |
| |
| *(ptr_aPrevNrg++) = nrg; |
| |
| peakDiff += peakDiff >> 1; /* transient impact factor == 1.5 */ |
| |
| if (peakDiff <= nrg) |
| { |
| *(aPower++) = 0x7FFFFFFF; /* in Q31 */ |
| } |
| else |
| { |
| pv_div(nrg, peakDiff, &result); |
| *(aPower++) = (result.quotient >> (result.shift_factor)) << 1; /* in Q31 */ |
| } |
| |
| } /* bin */ |
| |
| } |
| |
| |
| #endif |
| |
| #endif |
