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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/int_lsf.c
+
+ Date: 04/20/2000
+
+------------------------------------------------------------------------------
+ REVISION HISTORY
+
+ Description: Put file into template and first pass at optimization.
+
+ Description: Made changes based on comments from the review meeting. Used
+ pointers instead of index addressing in the arrays.
+
+ Description: Added type definition to the input/output section. Fixed tabs.
+ Deleted pseudo-code.
+
+ Description: Synchronized file with UMTS versin 3.2.0. Updated coding
+ template. Removed unnecessary include files.
+
+ Description: Made the following changes per comments from Phase 2/3 review:
+ 1. Modified FOR loops to count down.
+ 2. Made some cosmetic changes in the Pseudo-code section.
+
+ Description: Changed to pass in overflow flag pointer to the add() routine.
+
+ Description: Replaced "int" and/or "char" with OSCL defined types.
+
+ Description:
+
+------------------------------------------------------------------------------
+*/
+
+/*----------------------------------------------------------------------------
+; INCLUDES
+----------------------------------------------------------------------------*/
+#include "int_lsf.h"
+#include "typedef.h"
+#include "basic_op.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 STORE/BUFFER/POINTER DEFINITIONS
+; Variable declaration - defined here and used outside this module
+----------------------------------------------------------------------------*/
+
+
+/*
+------------------------------------------------------------------------------
+ FUNCTION NAME: Int_lsf
+------------------------------------------------------------------------------
+ INPUT AND OUTPUT DEFINITIONS
+
+ Inputs:
+ lsf_old = LSF vector at the 4th SF of past frame (Word16)
+ lsf_new = LSF vector at the 4th SF of present frame (Word16)
+ i_subfr = Current subframe (equal to 0,40,80 or 120) (Word16)
+ lsf_out = interpolated LSF parameters for current subframe (Word16)
+
+ Outputs:
+ lsf_out = new interpolated LSF parameters for current subframe
+ pOverflow = pointer of type Flag * to overflow indicator.
+
+ Returns:
+ None.
+
+ Global Variables Used:
+ None.
+
+ Local Variables Needed:
+ None.
+
+------------------------------------------------------------------------------
+ FUNCTION DESCRIPTION
+
+ This function interpolates the LSFs for selected subframe.
+ The 20 ms speech frame is divided into 4 subframes. The LSFs are
+ interpolated at the 1st, 2nd and 3rd subframe and only forwarded
+ at the 4th subframe.
+
+ |------|------|------|------|
+ sf1 sf2 sf3 sf4
+ F0 F1
+
+ sf1: 3/4 F0 + 1/4 F1 sf3: 1/4 F0 + 3/4 F1
+ sf2: 1/2 F0 + 1/2 F1 sf4: F1
+
+------------------------------------------------------------------------------
+ REQUIREMENTS
+
+ None.
+
+------------------------------------------------------------------------------
+ REFERENCES
+
+ int_lsf.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001
+
+------------------------------------------------------------------------------
+ PSEUDO-CODE
+
+void Int_lsf(
+ Word16 lsf_old[], // i : LSF vector at the 4th SF of past frame
+ Word16 lsf_new[], // i : LSF vector at the 4th SF of present frame
+ Word16 i_subfr, // i : Pointer to current sf (equal to 0,40,80 or 120)
+ Word16 lsf_out[] // o : interpolated LSF parameters for current sf
+)
+{
+ Word16 i;
+
+ if ( i_subfr == 0 )
+ {
+ for (i = 0; i < M; i++) {
+ lsf_out[i] = add(sub(lsf_old[i], shr(lsf_old[i], 2)),
+ shr(lsf_new[i], 2));
+ }
+ }
+ else if ( sub(i_subfr, 40) == 0 )
+ {
+ for (i = 0; i < M; i++) {
+ lsf_out[i] = add(shr(lsf_old[i],1), shr(lsf_new[i], 1) );
+ }
+ }
+ else if ( sub(i_subfr, 80) == 0 )
+ {
+ for (i = 0; i < M; i++) {
+ lsf_out[i] = add(shr(lsf_old[i], 2),
+ sub(lsf_new[i], shr(lsf_new[i], 2)));
+ }
+ }
+ else if ( sub(i_subfr, 120) == 0 )
+ {
+ for (i = 0; i < M; i++) {
+ lsf_out[i] = lsf_new[i];
+ }
+ }
+
+ 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 Int_lsf(
+ Word16 lsf_old[], /* i : LSF vector at the 4th SF of past frame */
+ Word16 lsf_new[], /* i : LSF vector at the 4th SF of present frame */
+ Word16 i_subfr, /* i : Current sf (equal to 0,40,80 or 120) */
+ Word16 lsf_out[], /* o : interpolated LSF parameters for current sf */
+ Flag *pOverflow /* o : flag set if overflow occurs */
+)
+{
+ register Word16 i;
+ register Word16 temp1;
+ register Word16 temp2;
+
+ if (i_subfr == 0)
+ {
+ for (i = M - 1; i >= 0; i--)
+ {
+ if (*(lsf_old + i) < 0)
+ {
+ temp1 = ~(~(*(lsf_old + i)) >> 2);
+ }
+ else
+ {
+ temp1 = *(lsf_old + i) >> 2;
+ }
+ if (*(lsf_new + i) < 0)
+ {
+ temp2 = ~(~(*(lsf_new + i)) >> 2);
+ }
+ else
+ {
+ temp2 = *(lsf_new + i) >> 2;
+ }
+ *(lsf_out + i) = add((Word16)(*(lsf_old + i) - temp1),
+ (Word16)temp2,
+ pOverflow);
+ }
+ }
+
+ else if (i_subfr == 40)
+ {
+ for (i = M - 1; i >= 0; i--)
+ {
+ if (*(lsf_old + i) < 0)
+ {
+ temp1 = ~(~(*(lsf_old + i)) >> 1);
+ }
+ else
+ {
+ temp1 = *(lsf_old + i) >> 1;
+ }
+ if (*(lsf_new + i) < 0)
+ {
+ temp2 = ~(~(*(lsf_new + i)) >> 1);
+ }
+ else
+ {
+ temp2 = *(lsf_new + i) >> 1;
+ }
+ *(lsf_out + i) = add(
+ temp1,
+ temp2,
+ pOverflow);
+ }
+ }
+
+ else if (i_subfr == 80)
+ {
+ for (i = M - 1; i >= 0; i--)
+ {
+ if (*(lsf_old + i) < 0)
+ {
+ temp1 = ~(~(*(lsf_old + i)) >> 2);
+ }
+ else
+ {
+ temp1 = *(lsf_old + i) >> 2;
+ }
+ if (*(lsf_new + i) < 0)
+ {
+ temp2 = ~(~(*(lsf_new + i)) >> 2);
+ }
+ else
+ {
+ temp2 = *(lsf_new + i) >> 2;
+ }
+ *(lsf_out + i) = add((Word16)temp1,
+ (Word16)(*(lsf_new + i) - temp2),
+ pOverflow);
+
+ }
+ }
+
+ else if (i_subfr == 120)
+ {
+ for (i = M - 1; i >= 0; i--)
+ {
+ *(lsf_out + i) = *(lsf_new + i);
+ }
+ }
+
+ return;
+}
+
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