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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.
* -------------------------------------------------------------------
*/
/****************************************************************************************
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: /audio/gsm_amr/c/src/prm2bits.c
Date: 02/04/2002
------------------------------------------------------------------------------
REVISION HISTORY
Description: Improved the code as per review comments.
Description: For Int2bin() and Prm2bits()
1. Eliminated unused include file typedef.h.
2. Replaced array addressing by pointers
3. Changed to decrement loops
Description: Replaced "int" and/or "char" with OSCL defined types.
Description:
------------------------------------------------------------------------------
*/
/*----------------------------------------------------------------------------
; INCLUDES
----------------------------------------------------------------------------*/
#include "prm2bits.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.]
----------------------------------------------------------------------------*/
#define MASK 0x0001
/*----------------------------------------------------------------------------
; LOCAL FUNCTION DEFINITIONS
; [List function prototypes here]
----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
; LOCAL VARIABLE DEFINITIONS
; [Variable declaration - defined here and used outside this module]
----------------------------------------------------------------------------*/
/*
------------------------------------------------------------------------------
FUNCTION NAME: Int2bin
------------------------------------------------------------------------------
INPUT AND OUTPUT DEFINITIONS
Inputs:
value = value to be converted to binary of type Word16
no_of_bits = number of bits associated with value of type Word16
Outputs:
bitstream = pointer to address where bits are written of type Word16
Returns:
None
Global Variables Used:
None
Local Variables Needed:
None
------------------------------------------------------------------------------
FUNCTION DESCRIPTION
FUNCTION: Int2bin
PURPOSE: convert integer to binary and write the bits to the array
bitstream[]. The most significant bits are written first.
------------------------------------------------------------------------------
REQUIREMENTS
None
------------------------------------------------------------------------------
REFERENCES
prm2bits.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001
------------------------------------------------------------------------------
PSEUDO-CODE
static void Int2bin (
Word16 value, // input : value to be converted to binary
Word16 no_of_bits, // input : number of bits associated with value
Word16 *bitstream // output: address where bits are written
)
{
Word16 *pt_bitstream, i, bit;
pt_bitstream = &bitstream[no_of_bits];
for (i = 0; i < no_of_bits; i++)
{
bit = value & MASK;
if (bit == 0)
{
*--pt_bitstream = BIT_0;
}
else
{
*--pt_bitstream = BIT_1;
}
value = shr (value, 1);
}
}
------------------------------------------------------------------------------
RESOURCES USED [optional]
When the code is written for a specific target processor the
the resources used should be documented below.
HEAP MEMORY USED: x bytes
STACK MEMORY USED: x bytes
CLOCK CYCLES: (cycle count equation for this function) + (variable
used to represent cycle count for each subroutine
called)
where: (cycle count variable) = cycle count for [subroutine
name]
------------------------------------------------------------------------------
CAUTION [optional]
[State any special notes, constraints or cautions for users of this function]
------------------------------------------------------------------------------
*/
/*----------------------------------------------------------------------------
; FUNCTION CODE
----------------------------------------------------------------------------*/
static void Int2bin(
Word16 value, /* input : value to be converted to binary */
Word16 no_of_bits, /* input : number of bits associated with value */
Word16 *bitstream /* output: address where bits are written */
)
{
Word16 *pt_bitstream;
Word16 i;
pt_bitstream = &bitstream[no_of_bits-1];
for (i = no_of_bits; i != 0; i--)
{
*(pt_bitstream--) = value & MASK;
value >>= 1;
}
}
/*
------------------------------------------------------------------------------
FUNCTION NAME: prm2bits
------------------------------------------------------------------------------
INPUT AND OUTPUT DEFINITIONS
Inputs:
mode = AMR mode of type enum Mode
prm[] = pointer to analysis parameters of type Word16
Outputs:
bits[] = pointer to serial bits of type Word16
Returns:
None
Global Variables Used:
None
Local Variables Needed:
None
------------------------------------------------------------------------------
FUNCTION DESCRIPTION
FUNCTION: Prm2bits
PURPOSE: converts the encoder parameter vector into a vector of serial
bits.
DESCRIPTION: depending on the mode, different numbers of parameters
(with differing numbers of bits) are processed. Details
are found in bitno.tab
------------------------------------------------------------------------------
REQUIREMENTS
None
------------------------------------------------------------------------------
REFERENCES
prm2bits.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001
------------------------------------------------------------------------------
PSEUDO-CODE
void Prm2bits (
enum Mode mode, // i : AMR mode
Word16 prm[], // i : analysis parameters (size <= MAX_PRM_SIZE)
Word16 bits[] // o : serial bits (size <= MAX_SERIAL_SIZE)
)
{
Word16 i;
for (i = 0; i < prmno[mode]; i++)
{
Int2bin (prm[i], bitno[mode][i], bits);
bits += bitno[mode][i];
add(0,0); // account for above pointer update
}
return;
}
------------------------------------------------------------------------------
RESOURCES USED [optional]
When the code is written for a specific target processor the
the resources used should be documented below.
HEAP MEMORY USED: x bytes
STACK MEMORY USED: x bytes
CLOCK CYCLES: (cycle count equation for this function) + (variable
used to represent cycle count for each subroutine
called)
where: (cycle count variable) = cycle count for [subroutine
name]
------------------------------------------------------------------------------
CAUTION [optional]
[State any special notes, constraints or cautions for users of this function]
------------------------------------------------------------------------------
*/
/*----------------------------------------------------------------------------
; FUNCTION CODE
----------------------------------------------------------------------------*/
void Prm2bits(
enum Mode mode, /* i : AMR mode */
Word16 prm[], /* i : analysis parameters (size <= MAX_PRM_SIZE) */
Word16 bits[] /* o : serial bits (size <= MAX_SERIAL_SIZE) */
)
{
Word16 i;
const Word16 *p_mode;
Word16 *p_prm;
p_mode = &bitno[mode][0];
p_prm = &prm[0];
for (i = prmno[mode]; i != 0; i--)
{
Int2bin(*(p_prm++), *(p_mode), bits);
bits += *(p_mode++);
}
return;
}
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