| /* ------------------------------------------------------------------ |
| * 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; |
| } |
| |