msamr/opencore-amr/opencore/codecs_v2/audio/gsm_amr/amr_nb/common/src/bits2prm.cpp
/* ------------------------------------------------------------------
* 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.
* -------------------------------------------------------------------
*/
/****************************************************************************************
Portions of this file are derived from the following 3GPP standard:
3GPP TS 26.073
ANSI-C code for the Adaptive Multi-Rate (AMR) speech codec
Available from http://www.3gpp.org
(C) 2004, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TTA, TTC)
Permission to distribute, modify and use this file under the standard license
terms listed above has been obtained from the copyright holder.
****************************************************************************************/
/*
Filename: bits2prm.cpp
------------------------------------------------------------------------------
*/
/*----------------------------------------------------------------------------
; INCLUDES
----------------------------------------------------------------------------*/
#include "bits2prm.h"
#include "typedef.h"
#include "mode.h"
#include "bitno_tab.h"
/*----------------------------------------------------------------------------
; MACROS
; [Define module specific macros here]
----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
; DEFINES
; [Include all pre-processor statements here. Include conditional
; compile variables also.]
----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
; LOCAL FUNCTION DEFINITIONS
; [List function prototypes here]
----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
; LOCAL VARIABLE DEFINITIONS
; [Variable declaration - defined here and used outside this module]
----------------------------------------------------------------------------*/
/*
------------------------------------------------------------------------------
FUNCTION NAME: Bin2int
------------------------------------------------------------------------------
INPUT AND OUTPUT DEFINITIONS
Inputs:
no_of_bits = number of bits associated with value
bitstream = pointer to buffer where bits are read
Outputs:
None
Returns:
None
Global Variables Used:
None
Local Variables Needed:
None
------------------------------------------------------------------------------
FUNCTION DESCRIPTION
Function : Bin2int
Purpose : Read "no_of_bits" bits from the array bitstream[]
and convert to integer.
------------------------------------------------------------------------------
REQUIREMENTS
None
------------------------------------------------------------------------------
REFERENCES
bits2prm.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001
------------------------------------------------------------------------------
PSEUDO-CODE
static Word16 Bin2int ( // Reconstructed parameter
Word16 no_of_bits, // input : number of bits associated with value
Word16 *bitstream // output: address where bits are written
)
{
Word16 value, i, bit;
value = 0;
for (i = 0; i < no_of_bits; i++)
{
value = shl (value, 1);
bit = *bitstream++;
if (sub (bit, BIT_1) == 0)
value = add (value, 1);
}
return (value);
}
------------------------------------------------------------------------------
CAUTION [optional]
[State any special notes, constraints or cautions for users of this function]
------------------------------------------------------------------------------
*/
/*----------------------------------------------------------------------------
; FUNCTION CODE
----------------------------------------------------------------------------*/
static Word16 Bin2int( /* Reconstructed parameter */
Word16 no_of_bits, /* input : number of bits associated with value */
Word16 *bitstream /* input: address where bits are read from */
)
{
Word16 value;
Word16 i;
Word16 single_bit;
value = 0;
for (i = 0; i < no_of_bits; i++)
{
value <<= 1;
single_bit = *(bitstream++);
value |= single_bit;
}
return (value);
}
/*
------------------------------------------------------------------------------
FUNCTION NAME: bits2prm
------------------------------------------------------------------------------
INPUT AND OUTPUT DEFINITIONS
Inputs:
mode = AMR mode of type enum Mode
bits[] = pointer to serial bits of type Word16
prm[] = pointer to analysis parameters of type Word16
Outputs:
None
Returns:
None
Global Variables Used:
None
Local Variables Needed:
None
------------------------------------------------------------------------------
FUNCTION DESCRIPTION
Function : Bits2prm
Purpose : Retrieves the vector of encoder parameters from
the received serial bits in a frame.
------------------------------------------------------------------------------
REQUIREMENTS
None
------------------------------------------------------------------------------
REFERENCES
bits2prm.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001
------------------------------------------------------------------------------
PSEUDO-CODE
void Bits2prm (
enum Mode mode, // i : AMR mode
Word16 bits[], // i : serial bits (size <= MAX_SERIAL_SIZE)
Word16 prm[] // o : analysis parameters (size <= MAX_PRM_SIZE)
)
{
Word16 i;
for (i = 0; i < prmno[mode]; i++)
{
prm[i] = Bin2int (bitno[mode][i], bits);
bits += bitno[mode][i];
add(0,0); // account for above pointer update
}
return;
}
------------------------------------------------------------------------------
CAUTION [optional]
[State any special notes, constraints or cautions for users of this function]
------------------------------------------------------------------------------
*/
/*----------------------------------------------------------------------------
; FUNCTION CODE
----------------------------------------------------------------------------*/
OSCL_EXPORT_REF void Bits2prm(
enum Mode mode, /* i : AMR mode */
Word16 bits[], /* i : serial bits (size <= MAX_SERIAL_SIZE) */
Word16 prm[] /* o : analysis parameters (size <= MAX_PRM_SIZE) */
)
{
Word16 i;
for (i = 0; i < prmno[mode]; i++)
{
prm[i] = Bin2int(bitno[mode][i], bits);
bits += bitno[mode][i];
}
return;
}