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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_get_header_data.c
------------------------------------------------------------------------------
REVISION HISTORY
Who: Date: MM/DD/YYYY
Description:
------------------------------------------------------------------------------
INPUT AND OUTPUT DEFINITIONS
Arguments: h_sbr_header - handle to struct SBR_HEADER_DATA
hBitBuf - handle to struct BIT_BUFFER
id_sbr - SBR_ELEMENT_ID
Return: error status - 0 if ok
------------------------------------------------------------------------------
FUNCTION DESCRIPTION
Reads header data from bitstream
------------------------------------------------------------------------------
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_get_header_data.h"
#include "sbr_constants.h"
#include "buf_getbits.h"
#include "aac_mem_funcs.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_HEADER_STATUS sbr_get_header_data(SBR_HEADER_DATA * h_sbr_header,
BIT_BUFFER * hBitBuf,
SBR_SYNC_STATE syncState)
{
SBR_HEADER_DATA lastHeader;
Int32 headerExtra1, headerExtra2;
/* Copy header to temporary header */
if (syncState == SBR_ACTIVE)
{
pv_memcpy(&lastHeader, h_sbr_header, sizeof(SBR_HEADER_DATA));
}
else
{
pv_memset((void *)&lastHeader, 0, sizeof(SBR_HEADER_DATA));
}
/* Read new header from bitstream */
h_sbr_header->ampResolution = buf_getbits(hBitBuf, SI_SBR_AMP_RES_BITS);
h_sbr_header->startFreq = buf_getbits(hBitBuf, SI_SBR_START_FREQ_BITS);
h_sbr_header->stopFreq = buf_getbits(hBitBuf, SI_SBR_STOP_FREQ_BITS);
h_sbr_header->xover_band = buf_getbits(hBitBuf, SI_SBR_XOVER_BAND_BITS);
buf_getbits(hBitBuf, SI_SBR_RESERVED_BITS_HDR);
headerExtra1 = buf_getbits(hBitBuf, SI_SBR_HEADER_EXTRA_1_BITS);
headerExtra2 = buf_getbits(hBitBuf, SI_SBR_HEADER_EXTRA_2_BITS);
/* handle extra header information */
if (headerExtra1)
{
h_sbr_header->freqScale = buf_getbits(hBitBuf, SI_SBR_FREQ_SCALE_BITS);
h_sbr_header->alterScale = buf_getbits(hBitBuf, SI_SBR_ALTER_SCALE_BITS);
h_sbr_header->noise_bands = buf_getbits(hBitBuf, SI_SBR_NOISE_BANDS_BITS);
}
else
{ /* Set default values.*/
h_sbr_header->freqScale = SBR_FREQ_SCALE_DEFAULT;
h_sbr_header->alterScale = SBR_ALTER_SCALE_DEFAULT;
h_sbr_header->noise_bands = SBR_NOISE_BANDS_DEFAULT;
}
if (headerExtra2)
{
h_sbr_header->limiterBands = buf_getbits(hBitBuf, SI_SBR_LIMITER_BANDS_BITS);
h_sbr_header->limiterGains = buf_getbits(hBitBuf, SI_SBR_LIMITER_GAINS_BITS);
h_sbr_header->interpolFreq = buf_getbits(hBitBuf, SI_SBR_INTERPOL_FREQ_BITS);
h_sbr_header->smoothingLength = buf_getbits(hBitBuf, SI_SBR_SMOOTHING_LENGTH_BITS);
}
else
{ /* Set default values.*/
h_sbr_header->limiterBands = SBR_LIMITER_BANDS_DEFAULT;
h_sbr_header->limiterGains = SBR_LIMITER_GAINS_DEFAULT;
h_sbr_header->interpolFreq = SBR_INTERPOL_FREQ_DEFAULT;
h_sbr_header->smoothingLength = SBR_SMOOTHING_LENGTH_DEFAULT;
}
if (syncState == SBR_ACTIVE)
{
h_sbr_header->status = HEADER_OK;
/* look for new settings */
if (lastHeader.startFreq != h_sbr_header->startFreq ||
lastHeader.stopFreq != h_sbr_header->stopFreq ||
lastHeader.xover_band != h_sbr_header->xover_band ||
lastHeader.freqScale != h_sbr_header->freqScale ||
lastHeader.alterScale != h_sbr_header->alterScale ||
lastHeader.noise_bands != h_sbr_header->noise_bands)
{
h_sbr_header->status = HEADER_RESET;
}
}
else
{
h_sbr_header->status = HEADER_RESET;
}
return h_sbr_header->status;
}
#endif
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