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/*
* t30tone.cxx
*
* T38FAX Pseudo Modem
*
* Copyright (c) 2002-2005 Vyacheslav Frolov
*
* Open H323 Project
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.0 (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.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* The Original Code is Open H323 Library.
*
* The Initial Developer of the Original Code is Vyacheslav Frolov
*
* Contributor(s): Equivalence Pty ltd
*
* $Log: t30tone.cxx,v $
* Revision 1.4 2005/02/03 11:32:12 vfrolov
* Fixed MSVC compile warnings
*
* Revision 1.3 2004/07/06 16:07:24 vfrolov
* Included ptlib.h for precompiling
*
* Revision 1.2 2002/06/07 06:25:15 robertj
* Added math.h for use of sin() function.
* Fixed GNU warnings.
*
* Revision 1.1 2002/04/30 10:59:07 vfrolov
* Initial revision
*
*
*/
#include <ptlib.h>
#include "t30tone.h"
#include <math.h>
///////////////////////////////////////////////////////////////
#define new PNEW
///////////////////////////////////////////////////////////////
typedef PInt16 SIMPLE_TYPE;
#define TWO_PI (3.1415926535897932384626433832795029L*2)
#define SIMPLES_PER_SEC 8000
#define BYTES_PER_SIMPLE sizeof(SIMPLE_TYPE)
///////////////////////////////////////////////////////////////
#define CNG_HZ 1100
#define CNG_AMPLITUDE 5000
#define CNG_ON_MSEC 500
#define CNG_ON_BYTES (((SIMPLES_PER_SEC*CNG_ON_MSEC)/1000)*BYTES_PER_SIMPLE)
#define CNG_OFF_MSEC 3000
#define CNG_OFF_BYTES (((SIMPLES_PER_SEC*CNG_OFF_MSEC)/1000)*BYTES_PER_SIMPLE)
#define CNG_SIMPLES_PER_REPEATE ((SIMPLES_PER_SEC*(CNG_HZ/100))/CNG_HZ)
static BYTE CngTone[CNG_SIMPLES_PER_REPEATE*BYTES_PER_SIMPLE];
static BOOL initCngTone()
{
for( size_t i = 0 ; i < sizeof(CngTone)/BYTES_PER_SIMPLE ; i++ ) {
double Sin = sin(double((CNG_HZ*TWO_PI*i)/SIMPLES_PER_SEC));
((SIMPLE_TYPE *)CngTone)[i] = (SIMPLE_TYPE)(Sin * CNG_AMPLITUDE);
}
return TRUE;
}
static const BOOL ___InitCngTone = initCngTone();
///////////////////////////////////////////////////////////////
T30Tone::T30Tone(T30Tone::Type _type)
{
type = _type;
switch(type) {
case cng:
// begin with 1 sec silence
index = ((SIMPLES_PER_SEC*(CNG_ON_MSEC+CNG_OFF_MSEC-1000))/1000)*BYTES_PER_SIMPLE;
break;
default:
index = 0;
}
}
void T30Tone::Read(void * buffer, PINDEX amount)
{
BYTE *pBuf = (BYTE *)buffer;
switch(type) {
case cng:
while(amount) {
if (index >= (PINDEX)(CNG_ON_BYTES + CNG_OFF_BYTES))
index = 0;
PINDEX len;
if ((PINDEX)CNG_ON_BYTES > index) {
PINDEX i = index % sizeof(CngTone);
len = sizeof(CngTone) - i;
if (len > amount)
len = amount;
memcpy(pBuf, CngTone + i, len);
} else {
len = CNG_ON_BYTES + CNG_OFF_BYTES - index;
if (len > amount)
len = amount;
memset(pBuf, 0, len);
}
pBuf += len;
amount -= len;
index += len;
}
break;
default:
memset(pBuf, 0, amount);
index = (index + amount) % BYTES_PER_SIMPLE;
}
}
///////////////////////////////////////////////////////////////
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