| /* ------------------------------------------------------------------ |
| * 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/spreproc.c |
| Functions: subframePreProc |
| |
| Date: 02/06/2002 |
| |
| ------------------------------------------------------------------------------ |
| REVISION HISTORY |
| |
| Description: Updated template used to PV coding template. |
| Eliminated unnecessary use of the sub() function. |
| |
| Description: |
| 1. Replaced copy() and for-loop with more efficient memcpy(). |
| 2. Eliminated unused include file copy.h. |
| |
| Description: Replaced OSCL mem type functions and eliminated include |
| files that now are chosen by OSCL definitions |
| |
| Description: Replaced "int" and/or "char" with OSCL defined types. |
| |
| Description: |
| |
| ------------------------------------------------------------------------------ |
| MODULE DESCRIPTION |
| |
| |
| ------------------------------------------------------------------------------ |
| */ |
| |
| /*---------------------------------------------------------------------------- |
| ; INCLUDES |
| ----------------------------------------------------------------------------*/ |
| #include <string.h> |
| |
| #include "spreproc.h" |
| #include "typedef.h" |
| #include "weight_a.h" |
| #include "syn_filt.h" |
| #include "residu.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: subframePreProc |
| ------------------------------------------------------------------------------ |
| INPUT AND OUTPUT DEFINITIONS |
| |
| Inputs: |
| mode -- enum Mode -- coder mode |
| gamma1 -- const Word16 array -- spectral exp. factor 1 |
| gamma1_12k2 -- const Word16 array -- spectral exp. factor 1 for EFR |
| gamma2 -- const Word16 array -- spectral exp. factor 2 |
| A -- Pointer to Word16 -- A(z) unquantized for the 4 subframes |
| Aq -- Pointer to Word16 -- A(z) quantized for the 4 subframes |
| speech -- Pointer to Word16 -- speech segment |
| mem_err -- Pointer to Word16 -- pointer to error signal |
| mem_w0 -- Pointer to Word16 -- memory of weighting filter |
| zero -- Pointer to Word16 -- pointer to zero vector |
| |
| Outputs: |
| ai_zero -- Word16 array -- history of weighted synth. filter |
| exc -- Word16 array -- long term prediction residual |
| h1 -- Word16 array -- impulse response |
| xn -- Word16 array -- target vector for pitch search |
| res2 -- Word16 array -- long term prediction residual |
| error -- Word16 array -- error of LPC synthesis filter |
| |
| Returns: |
| Zero |
| |
| Global Variables Used: |
| None |
| |
| Local Variables Needed: |
| None |
| |
| ------------------------------------------------------------------------------ |
| FUNCTION DESCRIPTION |
| |
| |
| ------------------------------------------------------------------------------ |
| REQUIREMENTS |
| |
| None |
| |
| ------------------------------------------------------------------------------ |
| REFERENCES |
| |
| spreproc.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 subframePreProc( |
| 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, /* i : A(z) unquantized for the 4 subframes */ |
| Word16 *Aq, /* i : A(z) quantized for the 4 subframes */ |
| Word16 *speech, /* i : speech segment */ |
| Word16 *mem_err, /* i : pointer to error signal */ |
| Word16 *mem_w0, /* i : memory of weighting filter */ |
| Word16 *zero, /* i : pointer to zero vector */ |
| Word16 ai_zero[], /* o : history of weighted synth. filter */ |
| Word16 exc[], /* o : long term prediction residual */ |
| Word16 h1[], /* o : impulse response */ |
| Word16 xn[], /* o : target vector for pitch search */ |
| Word16 res2[], /* o : long term prediction residual */ |
| Word16 error[] /* o : error of LPC synthesis filter */ |
| ) |
| { |
| Word16 Ap1[MP1]; /* A(z) with spectral expansion */ |
| Word16 Ap2[MP1]; /* A(z) with spectral expansion */ |
| const Word16 *g1; /* Pointer to correct gammma1 vector */ |
| |
| /* mode specific pointer to gamma1 values */ |
| if (mode == MR122 || mode == MR102) |
| { |
| g1 = gamma1_12k2; |
| } |
| else |
| { |
| g1 = gamma1; |
| } |
| |
| /* Find the weighted LPC coefficients for the weighting filter. */ |
| Weight_Ai(A, g1, Ap1); |
| Weight_Ai(A, gamma2, Ap2); |
| |
| memcpy(ai_zero, Ap1, (M + 1)*sizeof(Word16)); |
| |
| |
| Syn_filt(Aq, ai_zero, h1, L_SUBFR, zero, 0); |
| Syn_filt(Ap2, h1, h1, L_SUBFR, zero, 0); |
| |
| /* |
| * |
| * Find the target vector for pitch search: |
| * |
| */ |
| |
| /* LPC residual */ |
| Residu(Aq, speech, res2, L_SUBFR); |
| |
| memcpy(exc, res2, L_SUBFR*sizeof(Word16)); |
| |
| Syn_filt(Aq, exc, error, L_SUBFR, mem_err, 0); |
| |
| Residu(Ap1, error, xn, L_SUBFR); |
| |
| /* target signal xn[]*/ |
| Syn_filt(Ap2, xn, xn, L_SUBFR, mem_w0, 0); |
| |
| return; |
| |
| } |
