| /* ------------------------------------------------------------------ |
| * 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/lpc.c |
| |
| Date: 01/31/2002 |
| |
| ------------------------------------------------------------------------------ |
| REVISION HISTORY |
| |
| Description: Updating includes and making code more simple as per comments. |
| |
| 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: |
| |
| ------------------------------------------------------------------------------ |
| */ |
| |
| /*---------------------------------------------------------------------------- |
| ; INCLUDES |
| ----------------------------------------------------------------------------*/ |
| #include <stdlib.h> |
| |
| #include "lpc.h" |
| #include "typedef.h" |
| #include "oper_32b.h" |
| #include "autocorr.h" |
| #include "lag_wind.h" |
| #include "levinson.h" |
| #include "cnst.h" |
| #include "mode.h" |
| #include "window_tab.h" |
| #include "sub.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 STORE/BUFFER/POINTER DEFINITIONS |
| ; Variable declaration - defined here and used outside this module |
| ----------------------------------------------------------------------------*/ |
| |
| /* |
| ------------------------------------------------------------------------------ |
| FUNCTION NAME: lpc_init |
| ------------------------------------------------------------------------------ |
| INPUT AND OUTPUT DEFINITIONS |
| |
| Inputs: |
| state = pointer to pointer of state data of type lpcState |
| |
| Outputs: |
| None |
| |
| Returns: |
| None |
| |
| Global Variables Used: |
| None. |
| |
| Local Variables Needed: |
| None. |
| |
| ------------------------------------------------------------------------------ |
| FUNCTION DESCRIPTION |
| |
| This function initializes the state data for the LPC module. |
| |
| ------------------------------------------------------------------------------ |
| REQUIREMENTS |
| |
| None. |
| |
| ------------------------------------------------------------------------------ |
| REFERENCES |
| |
| lpc.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001 |
| |
| ------------------------------------------------------------------------------ |
| PSEUDO-CODE |
| |
| |
| lpcState* s; |
| |
| if (state == (lpcState **) NULL){ |
| // fprintf(stderr, "lpc_init: invalid parameter\n"); |
| return -1; |
| } |
| *state = NULL; |
| |
| // allocate memory |
| if ((s= (lpcState *) malloc(sizeof(lpcState))) == NULL){ |
| // fprintf(stderr, "lpc_init: can not malloc state structure\n"); |
| return -1; |
| } |
| |
| s->levinsonSt = NULL; |
| |
| // Init sub states |
| if (Levinson_init(&s->levinsonSt)) { |
| lpc_exit(&s); |
| return -1; |
| } |
| |
| |
| lpc_reset(s); |
| *state = s; |
| |
| return 0; |
| |
| ------------------------------------------------------------------------------ |
| 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] |
| |
| ------------------------------------------------------------------------------ |
| */ |
| Word16 lpc_init(lpcState **state) |
| { |
| lpcState* s; |
| |
| if (state == (lpcState **) NULL) |
| { |
| /* fprintf(stderr, "lpc_init: invalid parameter\n"); */ |
| return -1; |
| } |
| *state = NULL; |
| |
| /* allocate memory */ |
| if ((s = (lpcState *) malloc(sizeof(lpcState))) == NULL) |
| { |
| /* fprintf(stderr, "lpc_init: can not malloc state structure\n"); */ |
| return -1; |
| } |
| |
| s->levinsonSt = NULL; |
| |
| /* Init sub states */ |
| if (Levinson_init(&s->levinsonSt)) |
| { |
| lpc_exit(&s); |
| return -1; |
| } |
| |
| lpc_reset(s); |
| *state = s; |
| |
| return 0; |
| } |
| |
| /* |
| ------------------------------------------------------------------------------ |
| FUNCTION NAME: lpc_reset |
| ------------------------------------------------------------------------------ |
| INPUT AND OUTPUT DEFINITIONS |
| |
| Inputs: |
| state = pointer to pointer of state data of type lpcState |
| |
| Outputs: |
| None |
| |
| Returns: |
| None |
| |
| Global Variables Used: |
| None. |
| |
| Local Variables Needed: |
| None. |
| |
| ------------------------------------------------------------------------------ |
| FUNCTION DESCRIPTION |
| |
| This function resets the state data for the LPC module. |
| |
| ------------------------------------------------------------------------------ |
| REQUIREMENTS |
| |
| None. |
| |
| ------------------------------------------------------------------------------ |
| REFERENCES |
| |
| lpc.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001 |
| |
| ------------------------------------------------------------------------------ |
| PSEUDO-CODE |
| |
| if (state == (lpcState *) NULL){ |
| // fprintf(stderr, "lpc_reset: invalid parameter\n"); |
| return -1; |
| } |
| |
| Levinson_reset(state->levinsonSt); |
| |
| return 0; |
| |
| ------------------------------------------------------------------------------ |
| 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] |
| |
| ------------------------------------------------------------------------------ |
| */ |
| Word16 lpc_reset(lpcState *state) |
| { |
| |
| if (state == (lpcState *) NULL) |
| { |
| /* fprintf(stderr, "lpc_reset: invalid parameter\n"); */ |
| return -1; |
| } |
| |
| Levinson_reset(state->levinsonSt); |
| |
| return 0; |
| } |
| |
| /* |
| ------------------------------------------------------------------------------ |
| FUNCTION NAME: lpc_exit |
| ------------------------------------------------------------------------------ |
| INPUT AND OUTPUT DEFINITIONS |
| |
| Inputs: |
| state = pointer to pointer of state data of type lpcState |
| |
| Outputs: |
| None |
| |
| Returns: |
| None |
| |
| Global Variables Used: |
| None. |
| |
| Local Variables Needed: |
| None. |
| |
| ------------------------------------------------------------------------------ |
| FUNCTION DESCRIPTION |
| |
| This function frees the state data for the LPC module. |
| |
| ------------------------------------------------------------------------------ |
| REQUIREMENTS |
| |
| None. |
| |
| ------------------------------------------------------------------------------ |
| REFERENCES |
| |
| lpc.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001 |
| |
| ------------------------------------------------------------------------------ |
| PSEUDO-CODE |
| |
| |
| if (state == NULL || *state == NULL) |
| return; |
| |
| Levinson_exit(&(*state)->levinsonSt); |
| |
| // deallocate memory |
| free(*state); |
| *state = NULL; |
| |
| 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] |
| |
| ------------------------------------------------------------------------------ |
| */ |
| void lpc_exit(lpcState **state) |
| { |
| if (state == NULL || *state == NULL) |
| return; |
| |
| Levinson_exit(&(*state)->levinsonSt); |
| |
| /* deallocate memory */ |
| free(*state); |
| *state = NULL; |
| |
| return; |
| } |
| |
| |
| /* |
| ------------------------------------------------------------------------------ |
| FUNCTION NAME: lpc |
| ------------------------------------------------------------------------------ |
| INPUT AND OUTPUT DEFINITIONS |
| |
| Inputs: |
| state = pointer to state data of type lpcState |
| mode = coder mode of type enum Mode |
| x[] = pointer to input signal (Q15) of type Word16 |
| x_12k2[] = pointer to input signal (EFR) (Q15) of type Word16 |
| pOverflow = pointer to overflow indicator of type Flag |
| |
| Outputs: |
| a[] = pointer to predictor coefficients (Q12) of type Word16 |
| |
| Returns: |
| None |
| |
| Global Variables Used: |
| None. |
| |
| Local Variables Needed: |
| None. |
| |
| ------------------------------------------------------------------------------ |
| FUNCTION DESCRIPTION |
| |
| This function executes the LPC functionality for GSM AMR. |
| |
| ------------------------------------------------------------------------------ |
| REQUIREMENTS |
| |
| None. |
| |
| ------------------------------------------------------------------------------ |
| REFERENCES |
| |
| lpc.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001 |
| |
| ------------------------------------------------------------------------------ |
| PSEUDO-CODE |
| |
| Word16 rc[4]; // First 4 reflection coefficients Q15 |
| Word16 rLow[MP1], rHigh[MP1]; // Autocorrelations low and hi |
| // No fixed Q value but normalized |
| // so that overflow is avoided |
| |
| if ( sub ((Word16)mode, (Word16)MR122) == 0) |
| { |
| // Autocorrelations |
| Autocorr(x_12k2, M, rHigh, rLow, window_160_80); |
| // Lag windowing |
| Lag_window(M, rHigh, rLow); |
| // Levinson Durbin |
| Levinson(st->levinsonSt, rHigh, rLow, &a[MP1], rc); |
| |
| // Autocorrelations |
| Autocorr(x_12k2, M, rHigh, rLow, window_232_8); |
| // Lag windowing |
| Lag_window(M, rHigh, rLow); |
| // Levinson Durbin |
| Levinson(st->levinsonSt, rHigh, rLow, &a[MP1 * 3], rc); |
| } |
| else |
| { |
| // Autocorrelations |
| Autocorr(x, M, rHigh, rLow, window_200_40); |
| // Lag windowing |
| Lag_window(M, rHigh, rLow); |
| // Levinson Durbin |
| Levinson(st->levinsonSt, rHigh, rLow, &a[MP1 * 3], rc); |
| } |
| |
| return 0; |
| |
| ------------------------------------------------------------------------------ |
| 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 lpc( |
| lpcState *st, /* i/o: State struct */ |
| enum Mode mode, /* i : coder mode */ |
| Word16 x[], /* i : Input signal Q15 */ |
| Word16 x_12k2[], /* i : Input signal (EFR) Q15 */ |
| Word16 a[], /* o : predictor coefficients Q12 */ |
| Flag *pOverflow |
| ) |
| { |
| Word16 rc[4]; /* First 4 reflection coefficients Q15 */ |
| Word16 rLow[MP1], rHigh[MP1]; /* Autocorrelations low and hi */ |
| /* No fixed Q value but normalized */ |
| /* so that overflow is avoided */ |
| |
| if (mode == MR122) |
| { |
| /* Autocorrelations */ |
| Autocorr(x_12k2, M, rHigh, rLow, window_160_80, pOverflow); |
| /* Lag windowing */ |
| Lag_window(M, rHigh, rLow, pOverflow); |
| /* Levinson Durbin */ |
| Levinson(st->levinsonSt, rHigh, rLow, &a[MP1], rc, pOverflow); |
| |
| /* Autocorrelations */ |
| Autocorr(x_12k2, M, rHigh, rLow, window_232_8, pOverflow); |
| /* Lag windowing */ |
| Lag_window(M, rHigh, rLow, pOverflow); |
| /* Levinson Durbin */ |
| Levinson(st->levinsonSt, rHigh, rLow, &a[MP1 * 3], rc, pOverflow); |
| } |
| else |
| { |
| /* Autocorrelations */ |
| Autocorr(x, M, rHigh, rLow, window_200_40, pOverflow); |
| /* Lag windowing */ |
| Lag_window(M, rHigh, rLow, pOverflow); |
| /* Levinson Durbin */ |
| Levinson(st->levinsonSt, rHigh, rLow, &a[MP1 * 3], rc, pOverflow); |
| } |
| |
| } |
| |
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