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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_read_data.c
------------------------------------------------------------------------------
REVISION HISTORY
Who: Date: MM/DD/YYYY
Description:
------------------------------------------------------------------------------
INPUT AND OUTPUT DEFINITIONS
INPUT
SBRDECODER self,
SBRBITSTREAM * stream,
float *timeData,
int numChannels
OUTPUT
errorCode, noError if successful
------------------------------------------------------------------------------
FUNCTION DESCRIPTION
sbr decoder processing, set up SBR decoder phase 2 in case of
different cotrol data
------------------------------------------------------------------------------
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_read_data.h"
#include "s_bit_buffer.h"
#include "buf_getbits.h"
#include "sbr_get_sce.h"
#include "sbr_get_cpe.h"
#include "sbr_reset_dec.h"
#include "sbr_get_header_data.h"
#include "sbr_crc_check.h"
#include "aac_mem_funcs.h"
#include "init_sbr_dec.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_read_data(SBRDECODER_DATA * self,
SBR_DEC * sbrDec,
SBRBITSTREAM *stream)
{
SBR_ERROR sbr_err = SBRDEC_OK;
int32_t SbrFrameOK = 1;
int32_t sbrCRCAlwaysOn = 0;
UInt32 bs_header_flag = 0;
SBR_HEADER_STATUS headerStatus = HEADER_OK;
SBR_CHANNEL *SbrChannel = self->SbrChannel;
int32_t zeropadding_bits;
BIT_BUFFER bitBuf ;
/*
* evaluate Bitstream
*/
bitBuf.buffer_word = 0;
bitBuf.buffered_bits = 0;
bitBuf.nrBitsRead = 0;
bitBuf.char_ptr = stream->sbrElement[0].Data;
bitBuf.bufferLen = (stream->sbrElement[0].Payload) << 3;
/*
* we have to skip a nibble because the first element of Data only
* contains a nibble of data !
*/
buf_getbits(&bitBuf, LEN_NIBBLE);
if ((stream->sbrElement[0].ExtensionType == SBR_EXTENSION_CRC) ||
sbrCRCAlwaysOn)
{
int32_t CRCLen = ((stream->sbrElement[0].Payload - 1) << 3) + 4 - SI_SBR_CRC_BITS;
SbrFrameOK = sbr_crc_check(&bitBuf, CRCLen);
}
if (SbrFrameOK)
{
/*
* The sbr data seems ok, if the header flag is set we read the header
* and check if vital parameters have changed since the previous frame.
* If the syncState equals UPSAMPLING, the SBR Tool has not been
* initialised by SBR header data, and can only do upsampling
*/
bs_header_flag = buf_getbits(&bitBuf, 1); /* read Header flag */
if (bs_header_flag)
{
/*
* If syncState == SBR_ACTIVE, it means that we've had a SBR header
* before, and we will compare with the previous header to see if a
* reset is required. If the syncState equals UPSAMPLING this means
* that the SBR-Tool so far is only initialised to do upsampling
* and hence we need to do a reset, and initialise the system
* according to the present header.
*/
headerStatus = sbr_get_header_data(&(SbrChannel[0].frameData.sbr_header),
&bitBuf,
SbrChannel[0].syncState);
} /* if (bs_header_flag) */
switch (stream->sbrElement[0].ElementID)
{
case SBR_ID_SCE :
/* change of control data, reset decoder */
if (headerStatus == HEADER_RESET)
{
sbr_err = sbr_reset_dec(&(SbrChannel[0].frameData),
sbrDec,
self->SbrChannel[0].frameData.sbr_header.sampleRateMode);
if (sbr_err != SBRDEC_OK)
{
break;
}
/*
* At this point we have a header and the system has been reset,
* hence syncState from now on will be SBR_ACTIVE.
*/
SbrChannel[0].syncState = SBR_ACTIVE;
}
if ((SbrChannel[0].syncState == SBR_ACTIVE))
{
sbr_err = sbr_get_sce(&(SbrChannel[0].frameData),
&bitBuf
#ifdef PARAMETRICSTEREO
, self->hParametricStereoDec
#endif
);
if (sbr_err != SBRDEC_OK)
{
break;
}
}
break;
case SBR_ID_CPE :
if (bs_header_flag)
{
pv_memcpy(&(SbrChannel[1].frameData.sbr_header),
&(SbrChannel[0].frameData.sbr_header),
sizeof(SBR_HEADER_DATA));
}
/* change of control data, reset decoder */
if (headerStatus == HEADER_RESET)
{
for (int32_t lr = 0 ; lr < 2 ; lr++)
{
sbr_err = sbr_reset_dec(&(SbrChannel[lr].frameData),
sbrDec,
self->SbrChannel[0].frameData.sbr_header.sampleRateMode);
if (sbr_err != SBRDEC_OK)
{
break;
}
SbrChannel[lr].syncState = SBR_ACTIVE;
}
}
if (SbrChannel[0].syncState == SBR_ACTIVE)
{
sbr_err = sbr_get_cpe(&(SbrChannel[0].frameData),
&(SbrChannel[1].frameData),
&bitBuf);
if (sbr_err != SBRDEC_OK)
{
break;
}
}
break;
default:
sbr_err = SBRDEC_ILLEGAL_PLUS_ELE_ID;
break;
}
} /* if (SbrFrameOK) */
/*
* Check that the bits read did not go beyond SBR frame boundaries
*/
zeropadding_bits = (8 - (bitBuf.nrBitsRead & 0x7)) & 0x7;
if ((bitBuf.nrBitsRead + zeropadding_bits) > bitBuf.bufferLen)
{
sbr_err = SBRDEC_INVALID_BITSTREAM;
}
return sbr_err;
}
#endif
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