| /* ------------------------------------------------------------------ |
| * 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. |
| ****************************************************************************************/ |
| /* |
| ------------------------------------------------------------------------------ |
| |
| |
| |
| Pathname: ./audio/gsm-amr/c/src/pre_big.c |
| Functions: |
| |
| Date: 02/04/2002 |
| |
| ------------------------------------------------------------------------------ |
| REVISION HISTORY |
| |
| Description: Updated template used to PV coding template. |
| Changed to accept the pOverflow flag for EPOC compatibility. |
| |
| Description: Replaced "int" and/or "char" with OSCL defined types. |
| |
| Description: |
| |
| ------------------------------------------------------------------------------ |
| MODULE DESCRIPTION |
| |
| Big subframe (2 subframes) preprocessing |
| ------------------------------------------------------------------------------ |
| */ |
| |
| /*---------------------------------------------------------------------------- |
| ; INCLUDES |
| ----------------------------------------------------------------------------*/ |
| #include "pre_big.h" |
| #include "typedef.h" |
| #include "basic_op.h" |
| #include "syn_filt.h" |
| #include "weight_a.h" |
| #include "residu.h" |
| #include "cnst.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 VARIABLE DEFINITIONS |
| ; Variable declaration - defined here and used outside this module |
| ----------------------------------------------------------------------------*/ |
| |
| /* |
| ------------------------------------------------------------------------------ |
| FUNCTION NAME: pre_big |
| ------------------------------------------------------------------------------ |
| INPUT AND OUTPUT DEFINITIONS |
| |
| Inputs: |
| mode = enum Mode -- coder mode |
| gamma1 = array of type const Word16 -- spectral exp. factor 1 |
| gamma1_12k2 = array of type const Word16 -- spectral exp. factor 1 for EFR |
| gamma2 = array of type const Word16 -- spectral exp. factor 2 |
| A_t = array of type Word16 -- A(z) unquantized, for 4 subframes, Q12 |
| frameOffset = Word16 -- Start position in speech vector, Q0 |
| speech[] = array of type Word16 -- speech, Q0 |
| |
| Outputs: |
| mem_w = array of type Word16 -- synthesis filter memory state, Q0 |
| wsp = array of type Word16 -- weighted speech Q0 |
| pOverflow = pointer of type Flag -- overflow indicator |
| |
| Returns: |
| None |
| |
| Global Variables Used: |
| None |
| |
| Local Variables Needed: |
| None |
| |
| ------------------------------------------------------------------------------ |
| FUNCTION DESCRIPTION |
| |
| |
| ------------------------------------------------------------------------------ |
| REQUIREMENTS |
| |
| None |
| |
| ------------------------------------------------------------------------------ |
| REFERENCES |
| |
| pre_big.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001 |
| |
| ------------------------------------------------------------------------------ |
| PSEUDO-CODE |
| |
| |
| ------------------------------------------------------------------------------ |
| 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] |
| |
| ------------------------------------------------------------------------------ |
| */ |
| |
| void pre_big( |
| enum Mode mode, /* i : coder mode */ |
| const Word16 gamma1[], /* i : spectral exp. factor 1 */ |
| const Word16 gamma1_12k2[],/* i : spectral exp. factor 1 for EFR */ |
| const Word16 gamma2[], /* i : spectral exp. factor 2 */ |
| Word16 A_t[], /* i : A(z) unquantized, for 4 subframes, Q12 */ |
| Word16 frameOffset, /* i : Start position in speech vector, Q0 */ |
| Word16 speech[], /* i : speech, Q0 */ |
| Word16 mem_w[], /* i/o: synthesis filter memory state, Q0 */ |
| Word16 wsp[], /* o : weighted speech Q0 */ |
| Flag *pOverflow /* o : overflow indicator */ |
| ) |
| { |
| Word16 Ap1[MP1]; /* A(z) with spectral expansion */ |
| Word16 Ap2[MP1]; /* A(z) with spectral expansion */ |
| const Word16 *g1; /* Pointer to correct gammma1 vector */ |
| Word16 aOffset; |
| Word16 i; |
| |
| if (mode <= MR795) |
| { |
| g1 = gamma1; |
| } |
| else |
| { |
| g1 = gamma1_12k2; |
| } |
| |
| if (frameOffset > 0) |
| { |
| aOffset = 2 * MP1; |
| } |
| else |
| { |
| aOffset = 0; |
| } |
| |
| /* process two subframes (which form the "big" subframe) */ |
| for (i = 0; i < 2; i++) |
| { |
| Weight_Ai(&A_t[aOffset], g1, Ap1); |
| Weight_Ai(&A_t[aOffset], gamma2, Ap2); |
| Residu(Ap1, &speech[frameOffset], &wsp[frameOffset], L_SUBFR); |
| |
| Syn_filt(Ap2, &wsp[frameOffset], &wsp[frameOffset], L_SUBFR, mem_w, 1); |
| |
| aOffset = add(aOffset, MP1, pOverflow); |
| |
| frameOffset = add(frameOffset, L_SUBFR, pOverflow); |
| } |
| |
| return; |
| } |