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/* ------------------------------------------------------------------
* 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: sbr_reset_dec.c
------------------------------------------------------------------------------
REVISION HISTORY
Who: Date: MM/DD/YYYY
Description:
------------------------------------------------------------------------------
INPUT AND OUTPUT DEFINITIONS
------------------------------------------------------------------------------
FUNCTION DESCRIPTION
resets sbr decoder structure
------------------------------------------------------------------------------
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 2002.
------------------------------------------------------------------------------
PSEUDO-CODE
------------------------------------------------------------------------------
*/
/*----------------------------------------------------------------------------
; INCLUDES
----------------------------------------------------------------------------*/
#ifdef AAC_PLUS
#include "sbr_dec.h"
#include "pv_log2.h"
#include "fxp_mul32.h"
#include "sbr_reset_dec.h"
#include "sbr_find_start_andstop_band.h"
#include "sbr_update_freq_scale.h"
#include "sbr_downsample_lo_res.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
----------------------------------------------------------------------------*/
SBR_ERROR sbr_reset_dec(SBR_FRAME_DATA * hFrameData,
SBR_DEC * sbrDec,
Int32 upsampleFac)
{
SBR_ERROR err = SBRDEC_OK;
Int lsbM;
Int lsb;
Int usb;
Int32 i;
Int32 tmp_q1;
SBR_HEADER_DATA *headerData = &(hFrameData->sbr_header);
Int32 samplingFreq = sbrDec->outSampleRate;
hFrameData->reset_flag = 1;
/*Calculate master frequency function */
err = sbr_find_start_andstop_band(samplingFreq,
headerData->startFreq,
headerData->stopFreq,
&lsbM,
&usb);
if (err != SBRDEC_OK)
{
return err;
}
/* Calculate new v_k_master if needed */
if (headerData->masterStatus == MASTER_RESET)
{
sbr_update_freq_scale(sbrDec->V_k_master,
&(sbrDec->Num_Master),
lsbM,
usb,
headerData->freqScale,
headerData->alterScale,
0);
}
/*Derive Hiresolution from master frequency function*/
sbrDec->NSfb[HI] = sbrDec->Num_Master - headerData->xover_band;
for (i = headerData->xover_band; i <= sbrDec->Num_Master; i++)
{
sbrDec->FreqBandTable[HI][i-headerData->xover_band] = (Int)sbrDec->V_k_master[i];
}
if ((sbrDec->NSfb[HI] & 0x01) == 0) /* if even number of hires bands */
{
sbrDec->NSfb[LO] = sbrDec->NSfb[HI] >> 1;
/* Use every second lo-res=hi-res[0,2,4...] */
for (i = 0; i <= sbrDec->NSfb[LO]; i++)
{
sbrDec->FreqBandTable[LO][i] = sbrDec->FreqBandTable[HI][(i<<1)];
}
}
else
{ /* odd number of hi-res which means xover is odd */
sbrDec->NSfb[LO] = (sbrDec->NSfb[HI] + 1) >> 1;
/* Use lo-res=hi-res[0,1,3,5 ...] */
sbrDec->FreqBandTable[LO][0] = sbrDec->FreqBandTable[HI][0];
for (i = 1; i <= sbrDec->NSfb[LO]; i++)
{
sbrDec->FreqBandTable[LO][i] = sbrDec->FreqBandTable[HI][(i<<1)-1];
}
}
lsb = sbrDec->FreqBandTable[LOW_RES][0];
usb = sbrDec->FreqBandTable[LOW_RES][sbrDec->NSfb[LOW_RES]];
sbrDec->lowSubband = lsb;
sbrDec->highSubband = usb;
sbrDec->noSubbands = usb - lsb;
if ((lsb > 32) || (sbrDec->noSubbands <= 0))
{
return SBRDEC_ILLEGAL_SCFACTORS; /* invalid bands */
}
/* Calculate number of noise bands */
if (headerData->noise_bands == 0)
{
sbrDec->NoNoiseBands = 1;
}
else /* Calculate number of noise bands 1,2 or 3 bands/octave */
{
if (! lsb)
{
return SBRDEC_ILLEGAL_SCFACTORS; /* avoid div by 0 */
}
tmp_q1 = pv_log2((usb << 20) / lsb);
tmp_q1 = fxp_mul32_Q15(headerData->noise_bands, tmp_q1);
sbrDec->NoNoiseBands = (tmp_q1 + 16) >> 5;
if (sbrDec->NoNoiseBands == 0)
{
sbrDec->NoNoiseBands = 1;
}
}
headerData->noNoiseBands = sbrDec->NoNoiseBands;
/* Get noise bands */
sbr_downsample_lo_res(sbrDec->FreqBandTableNoise,
sbrDec->NoNoiseBands,
sbrDec->FreqBandTable[LO],
sbrDec->NSfb[LO]);
sbrDec->sbStopCodec = sbrDec->lowSubband;
if (sbrDec->sbStopCodec > (upsampleFac << 5))
{
sbrDec->sbStopCodec = (upsampleFac << 5);
}
hFrameData->nSfb[LO] = sbrDec->NSfb[LO];
hFrameData->nSfb[HI] = sbrDec->NSfb[HI];
hFrameData->nNfb = hFrameData->sbr_header.noNoiseBands;
hFrameData->offset = ((hFrameData->nSfb[LO]) << 1) - hFrameData->nSfb[HI];
return (SBRDEC_OK);
}
#endif
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