| /* |
| * Copyright (c) 2011 The WebRTC project authors. All Rights Reserved. |
| * |
| * Use of this source code is governed by a BSD-style license |
| * that can be found in the LICENSE file in the root of the source |
| * tree. An additional intellectual property rights grant can be found |
| * in the file PATENTS. All contributing project authors may |
| * be found in the AUTHORS file in the root of the source tree. |
| */ |
| |
| /****************************************************************** |
| |
| iLBC Speech Coder ANSI-C Source Code |
| |
| WebRtcIlbcfix_CbSearch.c |
| |
| ******************************************************************/ |
| |
| #include "modules/audio_coding/codecs/ilbc/defines.h" |
| #include "modules/audio_coding/codecs/ilbc/gain_quant.h" |
| #include "modules/audio_coding/codecs/ilbc/filtered_cb_vecs.h" |
| #include "modules/audio_coding/codecs/ilbc/constants.h" |
| #include "modules/audio_coding/codecs/ilbc/cb_mem_energy.h" |
| #include "modules/audio_coding/codecs/ilbc/interpolate_samples.h" |
| #include "modules/audio_coding/codecs/ilbc/cb_mem_energy_augmentation.h" |
| #include "modules/audio_coding/codecs/ilbc/cb_search_core.h" |
| #include "modules/audio_coding/codecs/ilbc/energy_inverse.h" |
| #include "modules/audio_coding/codecs/ilbc/augmented_cb_corr.h" |
| #include "modules/audio_coding/codecs/ilbc/cb_update_best_index.h" |
| #include "modules/audio_coding/codecs/ilbc/create_augmented_vec.h" |
| |
| /*----------------------------------------------------------------* |
| * Search routine for codebook encoding and gain quantization. |
| *----------------------------------------------------------------*/ |
| |
| void WebRtcIlbcfix_CbSearch( |
| IlbcEncoder *iLBCenc_inst, |
| /* (i) the encoder state structure */ |
| int16_t *index, /* (o) Codebook indices */ |
| int16_t *gain_index, /* (o) Gain quantization indices */ |
| int16_t *intarget, /* (i) Target vector for encoding */ |
| int16_t *decResidual,/* (i) Decoded residual for codebook construction */ |
| size_t lMem, /* (i) Length of buffer */ |
| size_t lTarget, /* (i) Length of vector */ |
| int16_t *weightDenum,/* (i) weighting filter coefficients in Q12 */ |
| size_t block /* (i) the subblock number */ |
| ) { |
| size_t i, range; |
| int16_t ii, j, stage; |
| int16_t *pp; |
| int16_t tmp; |
| int scale; |
| int16_t bits, temp1, temp2; |
| size_t base_size; |
| int32_t codedEner, targetEner; |
| int16_t gains[CB_NSTAGES+1]; |
| int16_t *cb_vecPtr; |
| size_t indexOffset, sInd, eInd; |
| int32_t CritMax=0; |
| int16_t shTotMax=WEBRTC_SPL_WORD16_MIN; |
| size_t bestIndex=0; |
| int16_t bestGain=0; |
| size_t indexNew; |
| int16_t CritNewSh; |
| int32_t CritNew; |
| int32_t *cDotPtr; |
| size_t noOfZeros; |
| int16_t *gainPtr; |
| int32_t t32, tmpW32; |
| int16_t *WebRtcIlbcfix_kGainSq5_ptr; |
| /* Stack based */ |
| int16_t CBbuf[CB_MEML+LPC_FILTERORDER+CB_HALFFILTERLEN]; |
| int32_t cDot[128]; |
| int32_t Crit[128]; |
| int16_t targetVec[SUBL+LPC_FILTERORDER]; |
| int16_t cbvectors[CB_MEML + 1]; /* Adding one extra position for |
| Coverity warnings. */ |
| int16_t codedVec[SUBL]; |
| int16_t interpSamples[20*4]; |
| int16_t interpSamplesFilt[20*4]; |
| int16_t energyW16[CB_EXPAND*128]; |
| int16_t energyShifts[CB_EXPAND*128]; |
| int16_t *inverseEnergy=energyW16; /* Reuse memory */ |
| int16_t *inverseEnergyShifts=energyShifts; /* Reuse memory */ |
| int16_t *buf = &CBbuf[LPC_FILTERORDER]; |
| int16_t *target = &targetVec[LPC_FILTERORDER]; |
| int16_t *aug_vec = (int16_t*)cDot; /* length [SUBL], reuse memory */ |
| |
| /* Determine size of codebook sections */ |
| |
| base_size=lMem-lTarget+1; |
| if (lTarget==SUBL) { |
| base_size=lMem-19; |
| } |
| |
| /* weighting of the CB memory */ |
| noOfZeros=lMem-WebRtcIlbcfix_kFilterRange[block]; |
| WebRtcSpl_MemSetW16(&buf[-LPC_FILTERORDER], 0, noOfZeros+LPC_FILTERORDER); |
| WebRtcSpl_FilterARFastQ12( |
| decResidual+noOfZeros, buf+noOfZeros, |
| weightDenum, LPC_FILTERORDER+1, WebRtcIlbcfix_kFilterRange[block]); |
| |
| /* weighting of the target vector */ |
| WEBRTC_SPL_MEMCPY_W16(&target[-LPC_FILTERORDER], buf+noOfZeros+WebRtcIlbcfix_kFilterRange[block]-LPC_FILTERORDER, LPC_FILTERORDER); |
| WebRtcSpl_FilterARFastQ12( |
| intarget, target, |
| weightDenum, LPC_FILTERORDER+1, lTarget); |
| |
| /* Store target, towards the end codedVec is calculated as |
| the initial target minus the remaining target */ |
| WEBRTC_SPL_MEMCPY_W16(codedVec, target, lTarget); |
| |
| /* Find the highest absolute value to calculate proper |
| vector scale factor (so that it uses 12 bits) */ |
| temp1 = WebRtcSpl_MaxAbsValueW16(buf, lMem); |
| temp2 = WebRtcSpl_MaxAbsValueW16(target, lTarget); |
| |
| if ((temp1>0)&&(temp2>0)) { |
| temp1 = WEBRTC_SPL_MAX(temp1, temp2); |
| scale = WebRtcSpl_GetSizeInBits((uint32_t)(temp1 * temp1)); |
| } else { |
| /* temp1 or temp2 is negative (maximum was -32768) */ |
| scale = 30; |
| } |
| |
| /* Scale to so that a mul-add 40 times does not overflow */ |
| scale = scale - 25; |
| scale = WEBRTC_SPL_MAX(0, scale); |
| |
| /* Compute energy of the original target */ |
| targetEner = WebRtcSpl_DotProductWithScale(target, target, lTarget, scale); |
| |
| /* Prepare search over one more codebook section. This section |
| is created by filtering the original buffer with a filter. */ |
| WebRtcIlbcfix_FilteredCbVecs(cbvectors, buf, lMem, WebRtcIlbcfix_kFilterRange[block]); |
| |
| range = WebRtcIlbcfix_kSearchRange[block][0]; |
| |
| if(lTarget == SUBL) { |
| /* Create the interpolated samples and store them for use in all stages */ |
| |
| /* First section, non-filtered half of the cb */ |
| WebRtcIlbcfix_InterpolateSamples(interpSamples, buf, lMem); |
| |
| /* Second section, filtered half of the cb */ |
| WebRtcIlbcfix_InterpolateSamples(interpSamplesFilt, cbvectors, lMem); |
| |
| /* Compute the CB vectors' energies for the first cb section (non-filtered) */ |
| WebRtcIlbcfix_CbMemEnergyAugmentation(interpSamples, buf, |
| scale, 20, energyW16, energyShifts); |
| |
| /* Compute the CB vectors' energies for the second cb section (filtered cb) */ |
| WebRtcIlbcfix_CbMemEnergyAugmentation(interpSamplesFilt, cbvectors, scale, |
| base_size + 20, energyW16, |
| energyShifts); |
| |
| /* Compute the CB vectors' energies and store them in the vector |
| * energyW16. Also the corresponding shift values are stored. The |
| * energy values are used in all three stages. */ |
| WebRtcIlbcfix_CbMemEnergy(range, buf, cbvectors, lMem, |
| lTarget, energyW16+20, energyShifts+20, scale, base_size); |
| |
| } else { |
| /* Compute the CB vectors' energies and store them in the vector |
| * energyW16. Also the corresponding shift values are stored. The |
| * energy values are used in all three stages. */ |
| WebRtcIlbcfix_CbMemEnergy(range, buf, cbvectors, lMem, |
| lTarget, energyW16, energyShifts, scale, base_size); |
| |
| /* Set the energy positions 58-63 and 122-127 to zero |
| (otherwise they are uninitialized) */ |
| WebRtcSpl_MemSetW16(energyW16+range, 0, (base_size-range)); |
| WebRtcSpl_MemSetW16(energyW16+range+base_size, 0, (base_size-range)); |
| } |
| |
| /* Calculate Inverse Energy (energyW16 is already normalized |
| and will contain the inverse energy in Q29 after this call */ |
| WebRtcIlbcfix_EnergyInverse(energyW16, base_size*CB_EXPAND); |
| |
| /* The gain value computed in the previous stage is used |
| * as an upper limit to what the next stage gain value |
| * is allowed to be. In stage 0, 16384 (1.0 in Q14) is used as |
| * the upper limit. */ |
| gains[0] = 16384; |
| |
| for (stage=0; stage<CB_NSTAGES; stage++) { |
| |
| /* Set up memories */ |
| range = WebRtcIlbcfix_kSearchRange[block][stage]; |
| |
| /* initialize search measures */ |
| CritMax=0; |
| shTotMax=-100; |
| bestIndex=0; |
| bestGain=0; |
| |
| /* loop over lags 40+ in the first codebook section, full search */ |
| cb_vecPtr = buf+lMem-lTarget; |
| |
| /* Calculate all the cross correlations (augmented part of CB) */ |
| if (lTarget==SUBL) { |
| WebRtcIlbcfix_AugmentedCbCorr(target, buf+lMem, |
| interpSamples, cDot, |
| 20, 39, scale); |
| cDotPtr=&cDot[20]; |
| } else { |
| cDotPtr=cDot; |
| } |
| /* Calculate all the cross correlations (main part of CB) */ |
| WebRtcSpl_CrossCorrelation(cDotPtr, target, cb_vecPtr, lTarget, range, scale, -1); |
| |
| /* Adjust the search range for the augmented vectors */ |
| if (lTarget==SUBL) { |
| range=WebRtcIlbcfix_kSearchRange[block][stage]+20; |
| } else { |
| range=WebRtcIlbcfix_kSearchRange[block][stage]; |
| } |
| |
| indexOffset=0; |
| |
| /* Search for best index in this part of the vector */ |
| WebRtcIlbcfix_CbSearchCore( |
| cDot, range, stage, inverseEnergy, |
| inverseEnergyShifts, Crit, |
| &indexNew, &CritNew, &CritNewSh); |
| |
| /* Update the global best index and the corresponding gain */ |
| WebRtcIlbcfix_CbUpdateBestIndex( |
| CritNew, CritNewSh, indexNew+indexOffset, cDot[indexNew+indexOffset], |
| inverseEnergy[indexNew+indexOffset], inverseEnergyShifts[indexNew+indexOffset], |
| &CritMax, &shTotMax, &bestIndex, &bestGain); |
| |
| sInd = ((CB_RESRANGE >> 1) > bestIndex) ? |
| 0 : (bestIndex - (CB_RESRANGE >> 1)); |
| eInd=sInd+CB_RESRANGE; |
| if (eInd>=range) { |
| eInd=range-1; |
| sInd=eInd-CB_RESRANGE; |
| } |
| |
| range = WebRtcIlbcfix_kSearchRange[block][stage]; |
| |
| if (lTarget==SUBL) { |
| i=sInd; |
| if (sInd<20) { |
| WebRtcIlbcfix_AugmentedCbCorr(target, cbvectors + lMem, |
| interpSamplesFilt, cDot, sInd + 20, |
| WEBRTC_SPL_MIN(39, (eInd + 20)), scale); |
| i=20; |
| cDotPtr = &cDot[20 - sInd]; |
| } else { |
| cDotPtr = cDot; |
| } |
| |
| cb_vecPtr = cbvectors+lMem-20-i; |
| |
| /* Calculate the cross correlations (main part of the filtered CB) */ |
| WebRtcSpl_CrossCorrelation(cDotPtr, target, cb_vecPtr, lTarget, |
| eInd - i + 1, scale, -1); |
| |
| } else { |
| cDotPtr = cDot; |
| cb_vecPtr = cbvectors+lMem-lTarget-sInd; |
| |
| /* Calculate the cross correlations (main part of the filtered CB) */ |
| WebRtcSpl_CrossCorrelation(cDotPtr, target, cb_vecPtr, lTarget, |
| eInd - sInd + 1, scale, -1); |
| |
| } |
| |
| /* Adjust the search range for the augmented vectors */ |
| indexOffset=base_size+sInd; |
| |
| /* Search for best index in this part of the vector */ |
| WebRtcIlbcfix_CbSearchCore( |
| cDot, eInd-sInd+1, stage, inverseEnergy+indexOffset, |
| inverseEnergyShifts+indexOffset, Crit, |
| &indexNew, &CritNew, &CritNewSh); |
| |
| /* Update the global best index and the corresponding gain */ |
| WebRtcIlbcfix_CbUpdateBestIndex( |
| CritNew, CritNewSh, indexNew+indexOffset, cDot[indexNew], |
| inverseEnergy[indexNew+indexOffset], inverseEnergyShifts[indexNew+indexOffset], |
| &CritMax, &shTotMax, &bestIndex, &bestGain); |
| |
| index[stage] = (int16_t)bestIndex; |
| |
| |
| bestGain = WebRtcIlbcfix_GainQuant(bestGain, |
| (int16_t)WEBRTC_SPL_ABS_W16(gains[stage]), stage, &gain_index[stage]); |
| |
| /* Extract the best (according to measure) codebook vector |
| Also adjust the index, so that the augmented vectors are last. |
| Above these vectors were first... |
| */ |
| |
| if(lTarget==(STATE_LEN-iLBCenc_inst->state_short_len)) { |
| |
| if((size_t)index[stage]<base_size) { |
| pp=buf+lMem-lTarget-index[stage]; |
| } else { |
| pp=cbvectors+lMem-lTarget- |
| index[stage]+base_size; |
| } |
| |
| } else { |
| |
| if ((size_t)index[stage]<base_size) { |
| if (index[stage]>=20) { |
| /* Adjust index and extract vector */ |
| index[stage]-=20; |
| pp=buf+lMem-lTarget-index[stage]; |
| } else { |
| /* Adjust index and extract vector */ |
| index[stage]+=(int16_t)(base_size-20); |
| |
| WebRtcIlbcfix_CreateAugmentedVec(index[stage]-base_size+40, |
| buf+lMem, aug_vec); |
| pp = aug_vec; |
| |
| } |
| } else { |
| |
| if ((index[stage] - base_size) >= 20) { |
| /* Adjust index and extract vector */ |
| index[stage]-=20; |
| pp=cbvectors+lMem-lTarget- |
| index[stage]+base_size; |
| } else { |
| /* Adjust index and extract vector */ |
| index[stage]+=(int16_t)(base_size-20); |
| WebRtcIlbcfix_CreateAugmentedVec(index[stage]-2*base_size+40, |
| cbvectors+lMem, aug_vec); |
| pp = aug_vec; |
| } |
| } |
| } |
| |
| /* Subtract the best codebook vector, according |
| to measure, from the target vector */ |
| |
| WebRtcSpl_AddAffineVectorToVector(target, pp, (int16_t)(-bestGain), |
| (int32_t)8192, (int16_t)14, lTarget); |
| |
| /* record quantized gain */ |
| gains[stage+1] = bestGain; |
| |
| } /* end of Main Loop. for (stage=0;... */ |
| |
| /* Calculte the coded vector (original target - what's left) */ |
| for (i=0;i<lTarget;i++) { |
| codedVec[i]-=target[i]; |
| } |
| |
| /* Gain adjustment for energy matching */ |
| codedEner = WebRtcSpl_DotProductWithScale(codedVec, codedVec, lTarget, scale); |
| |
| j=gain_index[0]; |
| |
| temp1 = (int16_t)WebRtcSpl_NormW32(codedEner); |
| temp2 = (int16_t)WebRtcSpl_NormW32(targetEner); |
| |
| if(temp1 < temp2) { |
| bits = 16 - temp1; |
| } else { |
| bits = 16 - temp2; |
| } |
| |
| tmp = (int16_t)((gains[1] * gains[1]) >> 14); |
| |
| targetEner = (int16_t)WEBRTC_SPL_SHIFT_W32(targetEner, -bits) * tmp; |
| |
| tmpW32 = ((int32_t)(gains[1]-1))<<1; |
| |
| /* Pointer to the table that contains |
| gain_sq5TblFIX * gain_sq5TblFIX in Q14 */ |
| gainPtr=(int16_t*)WebRtcIlbcfix_kGainSq5Sq+gain_index[0]; |
| temp1 = (int16_t)WEBRTC_SPL_SHIFT_W32(codedEner, -bits); |
| |
| WebRtcIlbcfix_kGainSq5_ptr = (int16_t*)&WebRtcIlbcfix_kGainSq5[j]; |
| |
| /* targetEner and codedEner are in Q(-2*scale) */ |
| for (ii=gain_index[0];ii<32;ii++) { |
| |
| /* Change the index if |
| (codedEnergy*gainTbl[i]*gainTbl[i])<(targetEn*gain[0]*gain[0]) AND |
| gainTbl[i] < 2*gain[0] |
| */ |
| |
| t32 = temp1 * *gainPtr; |
| t32 = t32 - targetEner; |
| if (t32 < 0) { |
| if ((*WebRtcIlbcfix_kGainSq5_ptr) < tmpW32) { |
| j=ii; |
| WebRtcIlbcfix_kGainSq5_ptr = (int16_t*)&WebRtcIlbcfix_kGainSq5[ii]; |
| } |
| } |
| gainPtr++; |
| } |
| gain_index[0]=j; |
| |
| return; |
| } |
