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/* ------------------------------------------------------------------
* 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/calc_cor.c
Date: 06/12/2000
------------------------------------------------------------------------------
REVISION HISTORY
Description: Initial Optimization
Description: Optimize code by calculating two correlation per iteration
of the outer loop.
Description: Delete psedocode
Description: Synchronized file with UMTS version 3.2.0. Updated coding
template. Removed unnecessary include files.
Description: Made the following changes per comments from Phase 2/3 review:
1. Defined one local variable per line.
Description:
1. Eliminated unused include file typedef.h.
2. Replaced array addressing by pointers
3. Unrolled loops to save extra accesses to memory
Description: Replaced "int" and/or "char" with OSCL defined types.
Description: Using inline functions from fxp_arithmetic.h for mac operations.
Description: Replacing fxp_arithmetic.h with basic_op.h.
Description:
------------------------------------------------------------------------------
*/
/*----------------------------------------------------------------------------
; INCLUDES
----------------------------------------------------------------------------*/
#include "calc_cor.h"
#include "basic_op.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: comp_corr
------------------------------------------------------------------------------
INPUT AND OUTPUT DEFINITIONS
Inputs:
scal_sig = array of input samples. (Word16)
L_frame = length of frame used to compute pitch(Word16)
lag_max = maximum lag (Word16)
lag_min = minimum lag (Word16)
corr = pointer to array of correlations corresponding to the selected
lags. (Word32)
Outputs:
corr = pointer to array of correlations corresponding to the selected
lags. (Word32)
Returns:
none
Global Variables Used:
none
Local Variables Needed:
none
------------------------------------------------------------------------------
FUNCTION DESCRIPTION
This function calculates all correlations of scal_sig[] in a given delay
range.
The correlation is given by
cor[t] = <scal_sig[n],scal_sig[n-t]>, t=lag_min,...,lag_max
The function outputs all of the correlations
------------------------------------------------------------------------------
REQUIREMENTS
none
------------------------------------------------------------------------------
REFERENCES
[1] calc_cor.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001
------------------------------------------------------------------------------
PSEUDO-CODE
void comp_corr (
Word16 scal_sig[], // i : scaled signal.
Word16 L_frame, // i : length of frame to compute pitch
Word16 lag_max, // i : maximum lag
Word16 lag_min, // i : minimum lag
Word32 corr[]) // o : correlation of selected lag
{
Word16 i, j;
Word16 *p, *p1;
Word32 t0;
for (i = lag_max; i >= lag_min; i--)
{
p = scal_sig;
p1 = &scal_sig[-i];
t0 = 0;
for (j = 0; j < L_frame; j++, p++, p1++)
{
t0 = L_mac (t0, *p, *p1);
}
corr[-i] = t0;
}
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 comp_corr(
Word16 scal_sig[], /* i : scaled signal. */
Word16 L_frame, /* i : length of frame to compute pitch */
Word16 lag_max, /* i : maximum lag */
Word16 lag_min, /* i : minimum lag */
Word32 corr[]) /* o : correlation of selected lag */
{
/*---------------------------------------------------
; lag_max and lag_min are typically negative numbers
-----------------------------------------------------*/
/* PIT_MIN_MR122 18 Minimum pitch lag (MR122 mode) */
/* PIT_MIN 20 Minimum pitch lag (all other modes) */
/* PIT_MAX 143 Maximum pitch lag */
Word16 i;
Word16 j;
Word16 *p;
Word16 *p1;
Word16 *p2;
Word16 *p_scal_sig;
Word32 t1;
Word32 t2;
Word32 t3;
Word32 t4;
corr = corr - lag_max ;
p_scal_sig = &scal_sig[-lag_max];
for (i = ((lag_max - lag_min) >> 2) + 1; i > 0; i--)
{
t1 = 0;
t2 = 0;
t3 = 0;
t4 = 0;
p = &scal_sig[0];
p1 = p_scal_sig++;
p_scal_sig++;
p2 = p_scal_sig++;
p_scal_sig++;
for (j = (L_frame >> 1); j != 0; j--)
{
t1 = amrnb_fxp_mac_16_by_16bb((Word32) * (p), (Word32) * (p1++), t1);
t2 = amrnb_fxp_mac_16_by_16bb((Word32) * (p), (Word32) * (p1), t2);
t3 = amrnb_fxp_mac_16_by_16bb((Word32) * (p), (Word32) * (p2++), t3);
t4 = amrnb_fxp_mac_16_by_16bb((Word32) * (p++), (Word32) * (p2), t4);
t1 = amrnb_fxp_mac_16_by_16bb((Word32) * (p), (Word32) * (p1++), t1);
t2 = amrnb_fxp_mac_16_by_16bb((Word32) * (p), (Word32) * (p1), t2);
t3 = amrnb_fxp_mac_16_by_16bb((Word32) * (p), (Word32) * (p2++), t3);
t4 = amrnb_fxp_mac_16_by_16bb((Word32) * (p++), (Word32) * (p2), t4);
}
*(corr++) = t1 << 1;
*(corr++) = t2 << 1;
*(corr++) = t3 << 1;
*(corr++) = t4 << 1;
}
return;
}
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