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authorMatthias P. Braendli <matthias.braendli@mpb.li>2016-09-10 20:15:44 +0200
committerMatthias P. Braendli <matthias.braendli@mpb.li>2016-09-10 20:15:44 +0200
commit14c7b800eaa23e9da7c92c7c4df397d0c191f097 (patch)
treed840b6ec41ff74d1184ca1dcd7731d08f1e9ebbb /libSBRenc/src/sbrenc_freq_sca.cpp
parent78a801e4d716c6f2403cc56cf6c5b6f138f24b2f (diff)
downloadODR-AudioEnc-14c7b800eaa23e9da7c92c7c4df397d0c191f097.tar.gz
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Remove FDK-AAC
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-rw-r--r--libSBRenc/src/sbrenc_freq_sca.cpp691
1 files changed, 0 insertions, 691 deletions
diff --git a/libSBRenc/src/sbrenc_freq_sca.cpp b/libSBRenc/src/sbrenc_freq_sca.cpp
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-
-/* -----------------------------------------------------------------------------------------------------------
-Software License for The Fraunhofer FDK AAC Codec Library for Android
-
-© Copyright 1995 - 2013 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
- All rights reserved.
-
- 1. INTRODUCTION
-The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software that implements
-the MPEG Advanced Audio Coding ("AAC") encoding and decoding scheme for digital audio.
-This FDK AAC Codec software is intended to be used on a wide variety of Android devices.
-
-AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient general perceptual
-audio codecs. AAC-ELD is considered the best-performing full-bandwidth communications codec by
-independent studies and is widely deployed. AAC has been standardized by ISO and IEC as part
-of the MPEG specifications.
-
-Patent licenses for necessary patent claims for the FDK AAC Codec (including those of Fraunhofer)
-may be obtained through Via Licensing (www.vialicensing.com) or through the respective patent owners
-individually for the purpose of encoding or decoding bit streams in products that are compliant with
-the ISO/IEC MPEG audio standards. Please note that most manufacturers of Android devices already license
-these patent claims through Via Licensing or directly from the patent owners, and therefore FDK AAC Codec
-software may already be covered under those patent licenses when it is used for those licensed purposes only.
-
-Commercially-licensed AAC software libraries, including floating-point versions with enhanced sound quality,
-are also available from Fraunhofer. Users are encouraged to check the Fraunhofer website for additional
-applications information and documentation.
-
-2. COPYRIGHT LICENSE
-
-Redistribution and use in source and binary forms, with or without modification, are permitted without
-payment of copyright license fees provided that you satisfy the following conditions:
-
-You must retain the complete text of this software license in redistributions of the FDK AAC Codec or
-your modifications thereto in source code form.
-
-You must retain the complete text of this software license in the documentation and/or other materials
-provided with redistributions of the FDK AAC Codec or your modifications thereto in binary form.
-You must make available free of charge copies of the complete source code of the FDK AAC Codec and your
-modifications thereto to recipients of copies in binary form.
-
-The name of Fraunhofer may not be used to endorse or promote products derived from this library without
-prior written permission.
-
-You may not charge copyright license fees for anyone to use, copy or distribute the FDK AAC Codec
-software or your modifications thereto.
-
-Your modified versions of the FDK AAC Codec must carry prominent notices stating that you changed the software
-and the date of any change. For modified versions of the FDK AAC Codec, the term
-"Fraunhofer FDK AAC Codec Library for Android" must be replaced by the term
-"Third-Party Modified Version of the Fraunhofer FDK AAC Codec Library for Android."
-
-3. NO PATENT LICENSE
-
-NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without limitation the patents of Fraunhofer,
-ARE GRANTED BY THIS SOFTWARE LICENSE. Fraunhofer provides no warranty of patent non-infringement with
-respect to this software.
-
-You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized
-by appropriate patent licenses.
-
-4. DISCLAIMER
-
-This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright holders and contributors
-"AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, including but not limited to the implied warranties
-of merchantability and fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
-CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, or consequential damages,
-including but not limited to procurement of substitute goods or services; loss of use, data, or profits,
-or business interruption, however caused and on any theory of liability, whether in contract, strict
-liability, or tort (including negligence), arising in any way out of the use of this software, even if
-advised of the possibility of such damage.
-
-5. CONTACT INFORMATION
-
-Fraunhofer Institute for Integrated Circuits IIS
-Attention: Audio and Multimedia Departments - FDK AAC LL
-Am Wolfsmantel 33
-91058 Erlangen, Germany
-
-www.iis.fraunhofer.de/amm
-amm-info@iis.fraunhofer.de
------------------------------------------------------------------------------------------------------------ */
-
-/*!
- \file
- \brief frequency scale
- \author Tobias Chalupka
-*/
-
-#include "sbrenc_freq_sca.h"
-#include "sbr_misc.h"
-
-#include "genericStds.h"
-
-/* StartFreq */
-static INT getStartFreq(INT fsCore, const INT start_freq);
-
-/* StopFreq */
-static INT getStopFreq(INT fsCore, const INT stop_freq);
-
-static INT numberOfBands(INT b_p_o, INT start, INT stop, FIXP_DBL warp_factor);
-static void CalcBands(INT * diff, INT start , INT stop , INT num_bands);
-static INT modifyBands(INT max_band, INT * diff, INT length);
-static void cumSum(INT start_value, INT* diff, INT length, UCHAR *start_adress);
-
-
-
-/*******************************************************************************
- Functionname: FDKsbrEnc_getSbrStartFreqRAW
- *******************************************************************************
- Description:
-
- Arguments:
-
- Return:
- *******************************************************************************/
-
-INT
-FDKsbrEnc_getSbrStartFreqRAW (INT startFreq, INT fsCore)
-{
- INT result;
-
- if ( startFreq < 0 || startFreq > 15) {
- return -1;
- }
- /* Update startFreq struct */
- result = getStartFreq(fsCore, startFreq);
-
- result = (result*(fsCore>>5)+1)>>1; /* (result*fsSBR/QMFbands+1)>>1; */
-
- return (result);
-
-} /* End FDKsbrEnc_getSbrStartFreqRAW */
-
-
-/*******************************************************************************
- Functionname: getSbrStopFreq
- *******************************************************************************
- Description:
-
- Arguments:
-
- Return:
- *******************************************************************************/
-INT FDKsbrEnc_getSbrStopFreqRAW (INT stopFreq, INT fsCore)
-{
- INT result;
-
- if ( stopFreq < 0 || stopFreq > 13)
- return -1;
-
- /* Uppdate stopFreq struct */
- result = getStopFreq(fsCore, stopFreq);
- result = (result*(fsCore>>5)+1)>>1; /* (result*fsSBR/QMFbands+1)>>1; */
-
- return (result);
-} /* End getSbrStopFreq */
-
-
-/*******************************************************************************
- Functionname: getStartFreq
- *******************************************************************************
- Description:
-
- Arguments: fsCore - core sampling rate
-
-
- Return:
- *******************************************************************************/
-static INT
-getStartFreq(INT fsCore, const INT start_freq)
-{
- INT k0_min;
-
- switch(fsCore){
- case 8000: k0_min = 24; /* (3000 * nQmfChannels / fsSBR ) + 0.5 */
- break;
- case 11025: k0_min = 17; /* (3000 * nQmfChannels / fsSBR ) + 0.5 */
- break;
- case 12000: k0_min = 16; /* (3000 * nQmfChannels / fsSBR ) + 0.5 */
- break;
- case 16000: k0_min = 16; /* (4000 * nQmfChannels / fsSBR ) + 0.5 */
- break;
- case 22050: k0_min = 12; /* (4000 * nQmfChannels / fsSBR ) + 0.5 */
- break;
- case 24000: k0_min = 11; /* (4000 * nQmfChannels / fsSBR ) + 0.5 */
- break;
- case 32000: k0_min = 10; /* (5000 * nQmfChannels / fsSBR ) + 0.5 */
- break;
- case 44100: k0_min = 7; /* (5000 * nQmfChannels / fsSBR ) + 0.5 */
- break;
- case 48000: k0_min = 7; /* (5000 * nQmfChannels / fsSBR ) + 0.5 */
- break;
- case 96000: k0_min = 3; /* (5000 * nQmfChannels / fsSBR ) + 0.5 */
- break;
- default:
- k0_min=11; /* illegal fs */
- }
-
-
- switch (fsCore) {
-
- case 8000:
- {
- INT v_offset[]= {-8, -7, -6, -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7};
- return (k0_min + v_offset[start_freq]);
- }
- case 11025:
- {
- INT v_offset[]= {-5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 9, 11, 13};
- return (k0_min + v_offset[start_freq]);
- }
- case 12000:
- {
- INT v_offset[]= {-5, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 9, 11, 13, 16};
- return (k0_min + v_offset[start_freq]);
- }
- case 16000:
- {
- INT v_offset[]= {-6, -4, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 9, 11, 13, 16};
- return (k0_min + v_offset[start_freq]);
- }
- case 22050:
- case 24000:
- case 32000:
- {
- INT v_offset[]= {-4, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 9, 11, 13, 16, 20};
- return (k0_min + v_offset[start_freq]);
- }
- case 44100:
- case 48000:
- case 96000:
- {
- INT v_offset[]= {-2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 9, 11, 13, 16, 20, 24};
- return (k0_min + v_offset[start_freq]);
- }
- default:
- {
- INT v_offset[]= {0, 1, 2, 3, 4, 5, 6, 7, 9, 11, 13, 16, 20, 24, 28, 33};
- return (k0_min + v_offset[start_freq]);
- }
- }
-} /* End getStartFreq */
-
-
-/*******************************************************************************
- Functionname: getStopFreq
- *******************************************************************************
- Description:
-
- Arguments:
-
- Return:
- *******************************************************************************/
- static INT
-getStopFreq(INT fsCore, const INT stop_freq)
-{
- INT result,i;
- INT k1_min;
- INT v_dstop[13];
-
- INT *v_stop_freq = NULL;
- INT v_stop_freq_16[14] = {48,49,50,51,52,54,55,56,57,59,60,61,63,64};
- INT v_stop_freq_22[14] = {35,37,38,40,42,44,46,48,51,53,56,58,61,64};
- INT v_stop_freq_24[14] = {32,34,36,38,40,42,44,46,49,52,55,58,61,64};
- INT v_stop_freq_32[14] = {32,34,36,38,40,42,44,46,49,52,55,58,61,64};
- INT v_stop_freq_44[14] = {23,25,27,29,32,34,37,40,43,47,51,55,59,64};
- INT v_stop_freq_48[14] = {21,23,25,27,30,32,35,38,42,45,49,54,59,64};
- INT v_stop_freq_64[14] = {20,22,24,26,29,31,34,37,41,45,49,54,59,64};
- INT v_stop_freq_88[14] = {15,17,19,21,23,26,29,33,37,41,46,51,57,64};
- INT v_stop_freq_96[14] = {13,15,17,19,21,24,27,31,35,39,44,50,57,64};
- INT v_stop_freq_192[14] = {7, 8,10,12,14,16,19,23,27,32,38,46,54,64};
-
- switch(fsCore){
- case 8000: k1_min = 48;
- v_stop_freq =v_stop_freq_16;
- break;
- case 11025: k1_min = 35;
- v_stop_freq =v_stop_freq_22;
- break;
- case 12000: k1_min = 32;
- v_stop_freq =v_stop_freq_24;
- break;
- case 16000: k1_min = 32;
- v_stop_freq =v_stop_freq_32;
- break;
- case 22050: k1_min = 23;
- v_stop_freq =v_stop_freq_44;
- break;
- case 24000: k1_min = 21;
- v_stop_freq =v_stop_freq_48;
- break;
- case 32000: k1_min = 20;
- v_stop_freq =v_stop_freq_64;
- break;
- case 44100: k1_min = 15;
- v_stop_freq =v_stop_freq_88;
- break;
- case 48000: k1_min = 13;
- v_stop_freq =v_stop_freq_96;
- break;
- case 96000: k1_min = 7;
- v_stop_freq =v_stop_freq_192;
- break;
- default:
- k1_min = 21; /* illegal fs */
- }
-
- /* if no valid core samplingrate is used this loop produces
- a segfault, because v_stop_freq is not initialized */
- /* Ensure increasing bandwidth */
- for(i = 0; i <= 12; i++) {
- v_dstop[i] = v_stop_freq[i+1] - v_stop_freq[i];
- }
-
- FDKsbrEnc_Shellsort_int(v_dstop, 13); /* Sort bandwidth changes */
-
- result = k1_min;
- for(i = 0; i < stop_freq; i++) {
- result = result + v_dstop[i];
- }
-
- return(result);
-
-}/* End getStopFreq */
-
-
-/*******************************************************************************
- Functionname: FDKsbrEnc_FindStartAndStopBand
- *******************************************************************************
- Description:
-
- Arguments: srSbr SBR sampling freqency
- srCore AAC core sampling freqency
- noChannels Number of QMF channels
- startFreq SBR start frequency in QMF bands
- stopFreq SBR start frequency in QMF bands
-
- *k0 Output parameter
- *k2 Output parameter
-
- Return: Error code (0 is OK)
- *******************************************************************************/
-INT
-FDKsbrEnc_FindStartAndStopBand(
- const INT srSbr,
- const INT srCore,
- const INT noChannels,
- const INT startFreq,
- const INT stopFreq,
- INT *k0,
- INT *k2
- )
-{
-
- /* Update startFreq struct */
- *k0 = getStartFreq(srCore, startFreq);
-
- /* Test if start freq is outside corecoder range */
- if( srSbr*noChannels < *k0 * srCore ) {
- return (1); /* raise the cross-over frequency and/or lower the number
- of target bands per octave (or lower the sampling frequency) */
- }
-
- /*Update stopFreq struct */
- if ( stopFreq < 14 ) {
- *k2 = getStopFreq(srCore, stopFreq);
- } else if( stopFreq == 14 ) {
- *k2 = 2 * *k0;
- } else {
- *k2 = 3 * *k0;
- }
-
- /* limit to Nyqvist */
- if (*k2 > noChannels) {
- *k2 = noChannels;
- }
-
-
-
- /* Test for invalid k0 k2 combinations */
- if ( (srCore == 22050) && ( (*k2 - *k0) > MAX_FREQ_COEFFS_FS44100 ) )
- return (1); /* Number of bands exceeds valid range of MAX_FREQ_COEFFS for fs=44.1kHz */
-
- if ( (srCore >= 24000) && ( (*k2 - *k0) > MAX_FREQ_COEFFS_FS48000 ) )
- return (1); /* Number of bands exceeds valid range of MAX_FREQ_COEFFS for fs>=48kHz */
-
- if ((*k2 - *k0) > MAX_FREQ_COEFFS)
- return (1);/*Number of bands exceeds valid range of MAX_FREQ_COEFFS */
-
- if ((*k2 - *k0) < 0)
- return (1);/* Number of bands is negative */
-
-
- return(0);
-}
-
-/*******************************************************************************
- Functionname: FDKsbrEnc_UpdateFreqScale
- *******************************************************************************
- Description:
-
- Arguments:
-
- Return:
- *******************************************************************************/
-INT
-FDKsbrEnc_UpdateFreqScale(
- UCHAR *v_k_master,
- INT *h_num_bands,
- const INT k0,
- const INT k2,
- const INT freqScale,
- const INT alterScale
- )
-
-{
-
- INT b_p_o = 0; /* bands_per_octave */
- FIXP_DBL warp = FL2FXCONST_DBL(0.0f);
- INT dk = 0;
-
- /* Internal variables */
- INT k1 = 0, i;
- INT num_bands0;
- INT num_bands1;
- INT diff_tot[MAX_OCTAVE + MAX_SECOND_REGION];
- INT *diff0 = diff_tot;
- INT *diff1 = diff_tot+MAX_OCTAVE;
- INT k2_achived;
- INT k2_diff;
- INT incr = 0;
-
- /* Init */
- if (freqScale==1) b_p_o = 12;
- if (freqScale==2) b_p_o = 10;
- if (freqScale==3) b_p_o = 8;
-
-
- if(freqScale > 0) /*Bark*/
- {
- if(alterScale==0)
- warp = FL2FXCONST_DBL(0.5f); /* 1.0/(1.0*2.0) */
- else
- warp = FL2FXCONST_DBL(1.0f/2.6f); /* 1.0/(1.3*2.0); */
-
-
- if(4*k2 >= 9*k0) /*two or more regions (how many times the basis band is copied)*/
- {
- k1=2*k0;
-
- num_bands0=numberOfBands(b_p_o, k0, k1, FL2FXCONST_DBL(0.5f));
- num_bands1=numberOfBands(b_p_o, k1, k2, warp);
-
- CalcBands(diff0, k0, k1, num_bands0);/*CalcBands1 => diff0 */
- FDKsbrEnc_Shellsort_int( diff0, num_bands0);/*SortBands sort diff0 */
-
- if (diff0[0] == 0) /* too wide FB bands for target tuning */
- {
- return (1);/* raise the cross-over frequency and/or lower the number
- of target bands per octave (or lower the sampling frequency */
- }
-
- cumSum(k0, diff0, num_bands0, v_k_master); /* cumsum */
-
- CalcBands(diff1, k1, k2, num_bands1); /* CalcBands2 => diff1 */
- FDKsbrEnc_Shellsort_int( diff1, num_bands1); /* SortBands sort diff1 */
- if(diff0[num_bands0-1] > diff1[0]) /* max(1) > min(2) */
- {
- if(modifyBands(diff0[num_bands0-1],diff1, num_bands1))
- return(1);
- }
-
- /* Add 2'nd region */
- cumSum(k1, diff1, num_bands1, &v_k_master[num_bands0]);
- *h_num_bands=num_bands0+num_bands1; /* Output nr of bands */
-
- }
- else /* one region */
- {
- k1=k2;
-
- num_bands0=numberOfBands(b_p_o, k0, k1, FL2FXCONST_DBL(0.5f));
- CalcBands(diff0, k0, k1, num_bands0);/* CalcBands1 => diff0 */
- FDKsbrEnc_Shellsort_int( diff0, num_bands0); /* SortBands sort diff0 */
-
- if (diff0[0] == 0) /* too wide FB bands for target tuning */
- {
- return (1); /* raise the cross-over frequency and/or lower the number
- of target bands per octave (or lower the sampling frequency */
- }
-
- cumSum(k0, diff0, num_bands0, v_k_master);/* cumsum */
- *h_num_bands=num_bands0; /* Output nr of bands */
-
- }
- }
- else /* Linear mode */
- {
- if (alterScale==0) {
- dk = 1;
- num_bands0 = 2 * ((k2 - k0)/2); /* FLOOR to get to few number of bands*/
- } else {
- dk = 2;
- num_bands0 = 2 * (((k2 - k0)/dk +1)/2); /* ROUND to get closest fit */
- }
-
- k2_achived = k0 + num_bands0*dk;
- k2_diff = k2 - k2_achived;
-
- for(i=0;i<num_bands0;i++)
- diff_tot[i] = dk;
-
- /* If linear scale wasn't achived */
- /* and we got wide SBR are */
- if (k2_diff < 0) {
- incr = 1;
- i = 0;
- }
-
- /* If linear scale wasn't achived */
- /* and we got small SBR are */
- if (k2_diff > 0) {
- incr = -1;
- i = num_bands0-1;
- }
-
- /* Adjust diff vector to get sepc. SBR range */
- while (k2_diff != 0) {
- diff_tot[i] = diff_tot[i] - incr;
- i = i + incr;
- k2_diff = k2_diff + incr;
- }
-
- cumSum(k0, diff_tot, num_bands0, v_k_master);/* cumsum */
- *h_num_bands=num_bands0; /* Output nr of bands */
-
- }
-
- if (*h_num_bands < 1)
- return(1); /*To small sbr area */
-
- return (0);
-}/* End FDKsbrEnc_UpdateFreqScale */
-
-static INT
-numberOfBands(INT b_p_o, INT start, INT stop, FIXP_DBL warp_factor)
-{
- INT result=0;
- /* result = 2* (INT) ( (double)b_p_o * (double)(FDKlog((double)stop/(double)start)/FDKlog((double)2)) * (double)FX_DBL2FL(warp_factor) + 0.5); */
- result = ( ( b_p_o * fMult( (CalcLdInt(stop) - CalcLdInt(start)), warp_factor) + (FL2FX_DBL(0.5f)>>LD_DATA_SHIFT)
- ) >> ((DFRACT_BITS-1)-LD_DATA_SHIFT) ) << 1; /* do not optimize anymore (rounding!!) */
-
- return(result);
-}
-
-
-static void
-CalcBands(INT * diff, INT start , INT stop , INT num_bands)
-{
- INT i, qb, qe, qtmp;
- INT previous;
- INT current;
- FIXP_DBL base, exp, tmp;
-
- previous=start;
- for(i=1; i<= num_bands; i++)
- {
- base = fDivNorm((FIXP_DBL)stop, (FIXP_DBL)start, &qb);
- exp = fDivNorm((FIXP_DBL)i, (FIXP_DBL)num_bands, &qe);
- tmp = fPow(base, qb, exp, qe, &qtmp);
- tmp = fMult(tmp, (FIXP_DBL)(start<<24));
- current = (INT)scaleValue(tmp, qtmp-23);
- current = (current+1) >> 1; /* rounding*/
- diff[i-1] = current-previous;
- previous = current;
- }
-
-}/* End CalcBands */
-
-
-static void
-cumSum(INT start_value, INT* diff, INT length, UCHAR *start_adress)
-{
- INT i;
- start_adress[0]=start_value;
- for(i=1;i<=length;i++)
- start_adress[i]=start_adress[i-1]+diff[i-1];
-} /* End cumSum */
-
-
-static INT
-modifyBands(INT max_band_previous, INT * diff, INT length)
-{
- INT change=max_band_previous-diff[0];
-
- /* Limit the change so that the last band cannot get narrower than the first one */
- if ( change > (diff[length-1] - diff[0]) / 2 )
- change = (diff[length-1] - diff[0]) / 2;
-
- diff[0] += change;
- diff[length-1] -= change;
- FDKsbrEnc_Shellsort_int(diff, length);
-
- return(0);
-}/* End modifyBands */
-
-
-/*******************************************************************************
- Functionname: FDKsbrEnc_UpdateHiRes
- *******************************************************************************
- Description:
-
-
- Arguments:
-
- Return:
- *******************************************************************************/
-INT
-FDKsbrEnc_UpdateHiRes(
- UCHAR *h_hires,
- INT *num_hires,
- UCHAR *v_k_master,
- INT num_master,
- INT *xover_band
- )
-{
- INT i;
- INT max1,max2;
-
- if( (v_k_master[*xover_band] > 32 ) || /* v_k_master[*xover_band] > noQMFChannels(dualRate)/divider */
- ( *xover_band > num_master ) ) {
- /* xover_band error, too big for this startFreq. Will be clipped */
-
- /* Calculate maximum value for xover_band */
- max1=0;
- max2=num_master;
- while( (v_k_master[max1+1] < 32 ) && /* noQMFChannels(dualRate)/divider */
- ( (max1+1) < max2) )
- {
- max1++;
- }
-
- *xover_band=max1;
- }
-
- *num_hires = num_master - *xover_band;
- for(i = *xover_band; i <= num_master; i++)
- {
- h_hires[i - *xover_band] = v_k_master[i];
- }
-
- return (0);
-}/* End FDKsbrEnc_UpdateHiRes */
-
-
-/*******************************************************************************
- Functionname: FDKsbrEnc_UpdateLoRes
- *******************************************************************************
- Description:
-
- Arguments:
-
- Return:
- *******************************************************************************/
-void
-FDKsbrEnc_UpdateLoRes(UCHAR * h_lores, INT *num_lores, UCHAR * h_hires, INT num_hires)
-{
- INT i;
-
- if(num_hires%2 == 0) /* if even number of hires bands */
- {
- *num_lores=num_hires/2;
- /* Use every second lores=hires[0,2,4...] */
- for(i=0;i<=*num_lores;i++)
- h_lores[i]=h_hires[i*2];
-
- }
- else /* odd number of hires which means xover is odd */
- {
- *num_lores=(num_hires+1)/2;
-
- /* Use lores=hires[0,1,3,5 ...] */
- h_lores[0]=h_hires[0];
- for(i=1;i<=*num_lores;i++)
- {
- h_lores[i]=h_hires[i*2-1];
- }
- }
-
-}/* End FDKsbrEnc_UpdateLoRes */