| /* ------------------------------------------------------------------ |
| * 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/bits2prm.c |
| |
| ------------------------------------------------------------------------------ |
| REVISION HISTORY |
| |
| Description: Fixed a typo in the include section. Optimized some lines of |
| code as per review comments. |
| |
| Description: Replaced "int" and/or "char" with OSCL defined types. |
| |
| Who: Date: |
| Description: |
| |
| ------------------------------------------------------------------------------ |
| */ |
| |
| /*---------------------------------------------------------------------------- |
| ; 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); |
| } |
| |
| ------------------------------------------------------------------------------ |
| 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 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; |
| } |
| |
| ------------------------------------------------------------------------------ |
| 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 |
| ----------------------------------------------------------------------------*/ |
| 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; |
| } |
| |
| |
| |
| |
| |
| |
| |
| |