trunk/src/modules/audio_coding/codecs/iSAC/main/source/decode.c - vendor/opensource/webrtc - Git at Google

 /*
  *  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.
  */

 /*
  * decode_B.c
  *
  * This file contains definition of funtions for decoding.
  * Decoding of lower-band, including normal-decoding and RCU decoding.
  * Decoding of upper-band, including 8-12 kHz, when the bandwidth is
  * 0-12 kHz, and 8-16 kHz, when the bandwidth is 0-16 kHz.
  *
  */


 #include "codec.h"
 #include "entropy_coding.h"
 #include "pitch_estimator.h"
 #include "bandwidth_estimator.h"
 #include "structs.h"
 #include "settings.h"

 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>


 /*
  * function to decode the bitstream
  * returns the total number of bytes in the stream
  */
 int
 WebRtcIsac_DecodeLb(
     float*          signal_out,
     ISACLBDecStruct* ISACdecLB_obj,
     WebRtc_Word16*    current_framesamples,
     WebRtc_Word16     isRCUPayload)
 {
   int k, model;
   int len, err;
   WebRtc_Word16 bandwidthInd;

   float LP_dec_float[FRAMESAMPLES_HALF];
   float HP_dec_float[FRAMESAMPLES_HALF];

   double LPw[FRAMESAMPLES_HALF];
   double HPw[FRAMESAMPLES_HALF];
   double LPw_pf[FRAMESAMPLES_HALF];

   double lo_filt_coef[(ORDERLO+1)*SUBFRAMES];
   double hi_filt_coef[(ORDERHI+1)*SUBFRAMES];

   double real_f[FRAMESAMPLES_HALF];
   double imag_f[FRAMESAMPLES_HALF];

   double PitchLags[4];
   double PitchGains[4];
   double AvgPitchGain;
   WebRtc_Word16 PitchGains_Q12[4];
   WebRtc_Word16 AvgPitchGain_Q12;

   float gain;

   int frame_nb; /* counter */
   int frame_mode; /* 0 for 20ms and 30ms, 1 for 60ms */
   int processed_samples;

   (ISACdecLB_obj->bitstr_obj).W_upper = 0xFFFFFFFF;
   (ISACdecLB_obj->bitstr_obj).streamval = 0;
   (ISACdecLB_obj->bitstr_obj).stream_index = 0;

   len = 0;

   /* decode framelength and BW estimation - not used,
      only for stream pointer*/
   err = WebRtcIsac_DecodeFrameLen(&ISACdecLB_obj->bitstr_obj,
                                   current_framesamples);
   if (err < 0) { // error check
     return err;
   }

   /* frame_mode: 0, or 1 */
   frame_mode = *current_framesamples/MAX_FRAMESAMPLES;
   /* processed_samples: either 320 (20ms) or 480 (30, 60 ms) */
   processed_samples = *current_framesamples/(frame_mode+1);

   err = WebRtcIsac_DecodeSendBW(&ISACdecLB_obj->bitstr_obj, &bandwidthInd);
   if (err < 0) { // error check
     return err;
   }

   /* one loop if it's one frame (20 or 30ms), 2 loops if 2 frames
      bundled together (60ms) */
   for (frame_nb = 0; frame_nb <= frame_mode; frame_nb++) {
     /* decode & dequantize pitch parameters */
     err = WebRtcIsac_DecodePitchGain(&(ISACdecLB_obj->bitstr_obj),
                                      PitchGains_Q12);
     if (err < 0) { // error check
       return err;
     }

     err = WebRtcIsac_DecodePitchLag(&ISACdecLB_obj->bitstr_obj,
                                     PitchGains_Q12, PitchLags);
     if (err < 0) { // error check
       return err;
     }

     AvgPitchGain_Q12 = (PitchGains_Q12[0] + PitchGains_Q12[1] +
                         PitchGains_Q12[2] + PitchGains_Q12[3])>>2;

     /* decode & dequantize FiltCoef */
     err = WebRtcIsac_DecodeLpc(&ISACdecLB_obj->bitstr_obj,
                                lo_filt_coef,hi_filt_coef, &model);
     if (err < 0) { // error check
       return err;
     }
     /* decode & dequantize spectrum */
     len = WebRtcIsac_DecodeSpecLb(&ISACdecLB_obj->bitstr_obj,
                                   real_f, imag_f, AvgPitchGain_Q12);
     if (len < 0) { // error check
       return len;
     }

     /* inverse transform */
     WebRtcIsac_Spec2time(real_f, imag_f, LPw, HPw,
                         &ISACdecLB_obj->fftstr_obj);

     /* convert PitchGains back to FLOAT for pitchfilter_post */
     for (k = 0; k < 4; k++) {
       PitchGains[k] = ((float)PitchGains_Q12[k])/4096;
     }

     if(isRCUPayload)
     {
       for (k = 0; k < 240; k++) {
         LPw[k] *= RCU_TRANSCODING_SCALE_INVERSE;
         HPw[k] *= RCU_TRANSCODING_SCALE_INVERSE;
       }
     }

     /* inverse pitch filter */
     WebRtcIsac_PitchfilterPost(LPw, LPw_pf,
                                 &ISACdecLB_obj->pitchfiltstr_obj, PitchLags, PitchGains);
     /* convert AvgPitchGain back to FLOAT for computation of gain */
     AvgPitchGain = ((float)AvgPitchGain_Q12)/4096;
     gain = 1.0f - 0.45f * (float)AvgPitchGain;

     for (k = 0; k < FRAMESAMPLES_HALF; k++) {
       /* reduce gain to compensate for pitch enhancer */
       LPw_pf[ k ] *= gain;
     }

     if(isRCUPayload)
     {
       for (k = 0; k < FRAMESAMPLES_HALF; k++) {
         /* compensation for transcoding gain changes*/
         LPw_pf[k] *= RCU_TRANSCODING_SCALE;
         HPw[k]    *= RCU_TRANSCODING_SCALE;
       }
     }

     /* perceptual post-filtering (using normalized lattice filter) */
     WebRtcIsac_NormLatticeFilterAr(ORDERLO,
                                     ISACdecLB_obj->maskfiltstr_obj.PostStateLoF,
                                     (ISACdecLB_obj->maskfiltstr_obj).PostStateLoG,
                                     LPw_pf, lo_filt_coef, LP_dec_float);
     WebRtcIsac_NormLatticeFilterAr(ORDERHI,
                                     ISACdecLB_obj->maskfiltstr_obj.PostStateHiF,
                                     (ISACdecLB_obj->maskfiltstr_obj).PostStateHiG,
                                     HPw, hi_filt_coef, HP_dec_float);

     /* recombine the 2 bands */
     WebRtcIsac_FilterAndCombineFloat( LP_dec_float, HP_dec_float,
                                       signal_out + frame_nb * processed_samples,
                                       &ISACdecLB_obj->postfiltbankstr_obj);
   }

   return len;
 }


 /*
  * This decode function is called when the codec is operating in 16 kHz
  * bandwidth to decode the upperband, i.e. 8-16 kHz.
  *
  * Contrary to lower-band, the upper-band (8-16 kHz) is not split in
  * frequency, but split to 12 sub-frames, i.e. twice as lower-band.
  */
 int
 WebRtcIsac_DecodeUb16(
     float*           signal_out,
     ISACUBDecStruct* ISACdecUB_obj,
     WebRtc_Word16      isRCUPayload)
 {
   int len, err;

   double halfFrameFirst[FRAMESAMPLES_HALF];
   double halfFrameSecond[FRAMESAMPLES_HALF];

   double percepFilterParam[(UB_LPC_ORDER+1) * (SUBFRAMES<<1) +
                            (UB_LPC_ORDER+1)];

   double real_f[FRAMESAMPLES_HALF];
   double imag_f[FRAMESAMPLES_HALF];

   len = 0;

   /* decode & dequantize FiltCoef */
   memset(percepFilterParam, 0, sizeof(percepFilterParam));
   err = WebRtcIsac_DecodeInterpolLpcUb(&ISACdecUB_obj->bitstr_obj,
                                        percepFilterParam, isac16kHz);
   if (err < 0) { // error check
     return err;
   }

   /* decode & dequantize spectrum */
   len = WebRtcIsac_DecodeSpecUB16(&ISACdecUB_obj->bitstr_obj, real_f,
                                     imag_f);
   if (len < 0) {  // error check
     return len;
   }
   if(isRCUPayload)
   {
     int n;
     for(n = 0; n < 240; n++)
     {
       real_f[n] *= RCU_TRANSCODING_SCALE_UB_INVERSE;
       imag_f[n] *= RCU_TRANSCODING_SCALE_UB_INVERSE;
     }
   }

   /* inverse transform */
   WebRtcIsac_Spec2time(real_f, imag_f, halfFrameFirst, halfFrameSecond,
                       &ISACdecUB_obj->fftstr_obj);

   /* perceptual post-filtering (using normalized lattice filter) */
   WebRtcIsac_NormLatticeFilterAr(UB_LPC_ORDER,
                                   ISACdecUB_obj->maskfiltstr_obj.PostStateLoF,
                                   (ISACdecUB_obj->maskfiltstr_obj).PostStateLoG, halfFrameFirst,
                                   &percepFilterParam[(UB_LPC_ORDER+1)], signal_out);

   WebRtcIsac_NormLatticeFilterAr(UB_LPC_ORDER,
                                   ISACdecUB_obj->maskfiltstr_obj.PostStateLoF,
                                   (ISACdecUB_obj->maskfiltstr_obj).PostStateLoG, halfFrameSecond,
                                   &percepFilterParam[(UB_LPC_ORDER + 1) * SUBFRAMES + (UB_LPC_ORDER+1)],
                                   &signal_out[FRAMESAMPLES_HALF]);

   return len;
 }

 /*
  * This decode function is called when the codec operates at 0-12 kHz
  * bandwidth to decode the upperband, i.e. 8-12 kHz.
  *
  * At the encoder the upper-band is split into two band, 8-12 kHz & 12-16
  * kHz, and only 8-12 kHz is encoded. At the decoder, 8-12 kHz band is
  * reconstructed and 12-16 kHz replaced with zeros. Then two bands
  * are combined, to reconstruct the upperband 8-16 kHz.
  */
 int
 WebRtcIsac_DecodeUb12(
     float*           signal_out,
     ISACUBDecStruct* ISACdecUB_obj,
     WebRtc_Word16      isRCUPayload)
 {
   int len, err;

   float LP_dec_float[FRAMESAMPLES_HALF];
   float HP_dec_float[FRAMESAMPLES_HALF];

   double LPw[FRAMESAMPLES_HALF];
   double HPw[FRAMESAMPLES_HALF];

   double percepFilterParam[(UB_LPC_ORDER+1)*SUBFRAMES];

   double real_f[FRAMESAMPLES_HALF];
   double imag_f[FRAMESAMPLES_HALF];

   len = 0;

   /* decode & dequantize FiltCoef */
   err = WebRtcIsac_DecodeInterpolLpcUb(&ISACdecUB_obj->bitstr_obj,
                                        percepFilterParam, isac12kHz);
   if(err < 0) { // error check
     return err;
   }

   /* decode & dequantize spectrum */
   len = WebRtcIsac_DecodeSpecUB12(&ISACdecUB_obj->bitstr_obj,
                                     real_f, imag_f);
   if(len < 0) { // error check
     return len;
   }

   if(isRCUPayload)
   {
     int n;
     for(n = 0; n < 240; n++)
     {
       real_f[n] *= RCU_TRANSCODING_SCALE_UB_INVERSE;
       imag_f[n] *= RCU_TRANSCODING_SCALE_UB_INVERSE;
     }
   }

   /* inverse transform */
   WebRtcIsac_Spec2time(real_f, imag_f, LPw, HPw, &ISACdecUB_obj->fftstr_obj);

   /* perceptual post-filtering (using normalized lattice filter) */
   WebRtcIsac_NormLatticeFilterAr(UB_LPC_ORDER,
                                   ISACdecUB_obj->maskfiltstr_obj.PostStateLoF,
                                   (ISACdecUB_obj->maskfiltstr_obj).PostStateLoG, LPw,
                                   percepFilterParam, LP_dec_float);

   /* Zerro for upper-band */
   memset(HP_dec_float, 0, sizeof(float) * (FRAMESAMPLES_HALF));

   /* recombine the 2 bands */
   WebRtcIsac_FilterAndCombineFloat(HP_dec_float, LP_dec_float, signal_out,
                                    &ISACdecUB_obj->postfiltbankstr_obj);


   return len;
 }
	/*
	* 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.
	*/

	/*
	* decode_B.c
	*
	* This file contains definition of funtions for decoding.
	* Decoding of lower-band, including normal-decoding and RCU decoding.
	* Decoding of upper-band, including 8-12 kHz, when the bandwidth is
	* 0-12 kHz, and 8-16 kHz, when the bandwidth is 0-16 kHz.
	*
	*/


	#include "codec.h"
	#include "entropy_coding.h"
	#include "pitch_estimator.h"
	#include "bandwidth_estimator.h"
	#include "structs.h"
	#include "settings.h"

	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>


	/*
	* function to decode the bitstream
	* returns the total number of bytes in the stream
	*/
	int
	WebRtcIsac_DecodeLb(
	float* signal_out,
	ISACLBDecStruct* ISACdecLB_obj,
	WebRtc_Word16* current_framesamples,
	WebRtc_Word16 isRCUPayload)
	{
	int k, model;
	int len, err;
	WebRtc_Word16 bandwidthInd;

	float LP_dec_float[FRAMESAMPLES_HALF];
	float HP_dec_float[FRAMESAMPLES_HALF];

	double LPw[FRAMESAMPLES_HALF];
	double HPw[FRAMESAMPLES_HALF];
	double LPw_pf[FRAMESAMPLES_HALF];

	double lo_filt_coef[(ORDERLO+1)*SUBFRAMES];
	double hi_filt_coef[(ORDERHI+1)*SUBFRAMES];

	double real_f[FRAMESAMPLES_HALF];
	double imag_f[FRAMESAMPLES_HALF];

	double PitchLags[4];
	double PitchGains[4];
	double AvgPitchGain;
	WebRtc_Word16 PitchGains_Q12[4];
	WebRtc_Word16 AvgPitchGain_Q12;

	float gain;

	int frame_nb; /* counter */
	int frame_mode; /* 0 for 20ms and 30ms, 1 for 60ms */
	int processed_samples;

	(ISACdecLB_obj->bitstr_obj).W_upper = 0xFFFFFFFF;
	(ISACdecLB_obj->bitstr_obj).streamval = 0;
	(ISACdecLB_obj->bitstr_obj).stream_index = 0;

	len = 0;

	/* decode framelength and BW estimation - not used,
	only for stream pointer*/
	err = WebRtcIsac_DecodeFrameLen(&ISACdecLB_obj->bitstr_obj,
	current_framesamples);
	if (err < 0) { // error check
	return err;
	}

	/* frame_mode: 0, or 1 */
	frame_mode = *current_framesamples/MAX_FRAMESAMPLES;
	/* processed_samples: either 320 (20ms) or 480 (30, 60 ms) */
	processed_samples = *current_framesamples/(frame_mode+1);

	err = WebRtcIsac_DecodeSendBW(&ISACdecLB_obj->bitstr_obj, &bandwidthInd);
	if (err < 0) { // error check
	return err;
	}

	/* one loop if it's one frame (20 or 30ms), 2 loops if 2 frames
	bundled together (60ms) */
	for (frame_nb = 0; frame_nb <= frame_mode; frame_nb++) {
	/* decode & dequantize pitch parameters */
	err = WebRtcIsac_DecodePitchGain(&(ISACdecLB_obj->bitstr_obj),
	PitchGains_Q12);
	if (err < 0) { // error check
	return err;
	}

	err = WebRtcIsac_DecodePitchLag(&ISACdecLB_obj->bitstr_obj,
	PitchGains_Q12, PitchLags);
	if (err < 0) { // error check
	return err;
	}

	AvgPitchGain_Q12 = (PitchGains_Q12[0] + PitchGains_Q12[1] +
	PitchGains_Q12[2] + PitchGains_Q12[3])>>2;

	/* decode & dequantize FiltCoef */
	err = WebRtcIsac_DecodeLpc(&ISACdecLB_obj->bitstr_obj,
	lo_filt_coef,hi_filt_coef, &model);
	if (err < 0) { // error check
	return err;
	}
	/* decode & dequantize spectrum */
	len = WebRtcIsac_DecodeSpecLb(&ISACdecLB_obj->bitstr_obj,
	real_f, imag_f, AvgPitchGain_Q12);
	if (len < 0) { // error check
	return len;
	}

	/* inverse transform */
	WebRtcIsac_Spec2time(real_f, imag_f, LPw, HPw,
	&ISACdecLB_obj->fftstr_obj);

	/* convert PitchGains back to FLOAT for pitchfilter_post */
	for (k = 0; k < 4; k++) {
	PitchGains[k] = ((float)PitchGains_Q12[k])/4096;
	}

	if(isRCUPayload)
	{
	for (k = 0; k < 240; k++) {
	LPw[k] *= RCU_TRANSCODING_SCALE_INVERSE;
	HPw[k] *= RCU_TRANSCODING_SCALE_INVERSE;
	}
	}

	/* inverse pitch filter */
	WebRtcIsac_PitchfilterPost(LPw, LPw_pf,
	&ISACdecLB_obj->pitchfiltstr_obj, PitchLags, PitchGains);
	/* convert AvgPitchGain back to FLOAT for computation of gain */
	AvgPitchGain = ((float)AvgPitchGain_Q12)/4096;
	gain = 1.0f - 0.45f * (float)AvgPitchGain;

	for (k = 0; k < FRAMESAMPLES_HALF; k++) {
	/* reduce gain to compensate for pitch enhancer */
	LPw_pf[ k ] *= gain;
	}

	if(isRCUPayload)
	{
	for (k = 0; k < FRAMESAMPLES_HALF; k++) {
	/* compensation for transcoding gain changes*/
	LPw_pf[k] *= RCU_TRANSCODING_SCALE;
	HPw[k] *= RCU_TRANSCODING_SCALE;
	}
	}

	/* perceptual post-filtering (using normalized lattice filter) */
	WebRtcIsac_NormLatticeFilterAr(ORDERLO,
	ISACdecLB_obj->maskfiltstr_obj.PostStateLoF,
	(ISACdecLB_obj->maskfiltstr_obj).PostStateLoG,
	LPw_pf, lo_filt_coef, LP_dec_float);
	WebRtcIsac_NormLatticeFilterAr(ORDERHI,
	ISACdecLB_obj->maskfiltstr_obj.PostStateHiF,
	(ISACdecLB_obj->maskfiltstr_obj).PostStateHiG,
	HPw, hi_filt_coef, HP_dec_float);

	/* recombine the 2 bands */
	WebRtcIsac_FilterAndCombineFloat( LP_dec_float, HP_dec_float,
	signal_out + frame_nb * processed_samples,
	&ISACdecLB_obj->postfiltbankstr_obj);
	}

	return len;
	}


	/*
	* This decode function is called when the codec is operating in 16 kHz
	* bandwidth to decode the upperband, i.e. 8-16 kHz.
	*
	* Contrary to lower-band, the upper-band (8-16 kHz) is not split in
	* frequency, but split to 12 sub-frames, i.e. twice as lower-band.
	*/
	int
	WebRtcIsac_DecodeUb16(
	float* signal_out,
	ISACUBDecStruct* ISACdecUB_obj,
	WebRtc_Word16 isRCUPayload)
	{
	int len, err;

	double halfFrameFirst[FRAMESAMPLES_HALF];
	double halfFrameSecond[FRAMESAMPLES_HALF];

	double percepFilterParam[(UB_LPC_ORDER+1) * (SUBFRAMES<<1) +
	(UB_LPC_ORDER+1)];

	double real_f[FRAMESAMPLES_HALF];
	double imag_f[FRAMESAMPLES_HALF];

	len = 0;

	/* decode & dequantize FiltCoef */
	memset(percepFilterParam, 0, sizeof(percepFilterParam));
	err = WebRtcIsac_DecodeInterpolLpcUb(&ISACdecUB_obj->bitstr_obj,
	percepFilterParam, isac16kHz);
	if (err < 0) { // error check
	return err;
	}

	/* decode & dequantize spectrum */
	len = WebRtcIsac_DecodeSpecUB16(&ISACdecUB_obj->bitstr_obj, real_f,
	imag_f);
	if (len < 0) { // error check
	return len;
	}
	if(isRCUPayload)
	{
	int n;
	for(n = 0; n < 240; n++)
	{
	real_f[n] *= RCU_TRANSCODING_SCALE_UB_INVERSE;
	imag_f[n] *= RCU_TRANSCODING_SCALE_UB_INVERSE;
	}
	}

	/* inverse transform */
	WebRtcIsac_Spec2time(real_f, imag_f, halfFrameFirst, halfFrameSecond,
	&ISACdecUB_obj->fftstr_obj);

	/* perceptual post-filtering (using normalized lattice filter) */
	WebRtcIsac_NormLatticeFilterAr(UB_LPC_ORDER,
	ISACdecUB_obj->maskfiltstr_obj.PostStateLoF,
	(ISACdecUB_obj->maskfiltstr_obj).PostStateLoG, halfFrameFirst,
	&percepFilterParam[(UB_LPC_ORDER+1)], signal_out);

	WebRtcIsac_NormLatticeFilterAr(UB_LPC_ORDER,
	ISACdecUB_obj->maskfiltstr_obj.PostStateLoF,
	(ISACdecUB_obj->maskfiltstr_obj).PostStateLoG, halfFrameSecond,
	&percepFilterParam[(UB_LPC_ORDER + 1) * SUBFRAMES + (UB_LPC_ORDER+1)],
	&signal_out[FRAMESAMPLES_HALF]);

	return len;
	}

	/*
	* This decode function is called when the codec operates at 0-12 kHz
	* bandwidth to decode the upperband, i.e. 8-12 kHz.
	*
	* At the encoder the upper-band is split into two band, 8-12 kHz & 12-16
	* kHz, and only 8-12 kHz is encoded. At the decoder, 8-12 kHz band is
	* reconstructed and 12-16 kHz replaced with zeros. Then two bands
	* are combined, to reconstruct the upperband 8-16 kHz.
	*/
	int
	WebRtcIsac_DecodeUb12(
	float* signal_out,
	ISACUBDecStruct* ISACdecUB_obj,
	WebRtc_Word16 isRCUPayload)
	{
	int len, err;

	float LP_dec_float[FRAMESAMPLES_HALF];
	float HP_dec_float[FRAMESAMPLES_HALF];

	double LPw[FRAMESAMPLES_HALF];
	double HPw[FRAMESAMPLES_HALF];

	double percepFilterParam[(UB_LPC_ORDER+1)*SUBFRAMES];

	double real_f[FRAMESAMPLES_HALF];
	double imag_f[FRAMESAMPLES_HALF];

	len = 0;

	/* decode & dequantize FiltCoef */
	err = WebRtcIsac_DecodeInterpolLpcUb(&ISACdecUB_obj->bitstr_obj,
	percepFilterParam, isac12kHz);
	if(err < 0) { // error check
	return err;
	}

	/* decode & dequantize spectrum */
	len = WebRtcIsac_DecodeSpecUB12(&ISACdecUB_obj->bitstr_obj,
	real_f, imag_f);
	if(len < 0) { // error check
	return len;
	}

	if(isRCUPayload)
	{
	int n;
	for(n = 0; n < 240; n++)
	{
	real_f[n] *= RCU_TRANSCODING_SCALE_UB_INVERSE;
	imag_f[n] *= RCU_TRANSCODING_SCALE_UB_INVERSE;
	}
	}

	/* inverse transform */
	WebRtcIsac_Spec2time(real_f, imag_f, LPw, HPw, &ISACdecUB_obj->fftstr_obj);

	/* perceptual post-filtering (using normalized lattice filter) */
	WebRtcIsac_NormLatticeFilterAr(UB_LPC_ORDER,
	ISACdecUB_obj->maskfiltstr_obj.PostStateLoF,
	(ISACdecUB_obj->maskfiltstr_obj).PostStateLoG, LPw,
	percepFilterParam, LP_dec_float);

	/* Zerro for upper-band */
	memset(HP_dec_float, 0, sizeof(float) * (FRAMESAMPLES_HALF));

	/* recombine the 2 bands */
	WebRtcIsac_FilterAndCombineFloat(HP_dec_float, LP_dec_float, signal_out,
	&ISACdecUB_obj->postfiltbankstr_obj);



	return len;
	}