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dtmf.cpp 2.32 KiB
/*
* Copyright (C) 2004-2006 Savoir-Faire Linux inc.
* Author : Yan Morin <yan.morin@savoirfairelinux.com>
* Author : Laurielle Lea <laurielle.lea@savoirfairelinux.com>
*
* Portions Copyright (c) 2000 Billy Biggs <bbiggs@div8.net>
* Portions Copyright (c) 2004 Wirlab <kphone@wirlab.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "dtmf.h"
DTMF::DTMF (unsigned int sampleRate)
: dtmfgenerator(sampleRate)
{
currentTone = 0;
newTone = 0;
}
DTMF::~DTMF (void)
{
}
void
DTMF::startTone (char code)
{
newTone = code;
}
bool
DTMF::generateDTMF (SFLDataFormat* buffer, size_t n)
{
if (!buffer) return false;
try {
if (currentTone != 0) {
// Currently generating a DTMF tone
if (currentTone == newTone) {
// Continue generating the same tone
dtmfgenerator.getNextSamples(buffer, n);
return true;
} else if (newTone != 0) {
// New tone requested
dtmfgenerator.getSamples(buffer, n, newTone);
currentTone = newTone;
return true;
} else {
// Stop requested
currentTone = newTone;
return false;
}
} else {
// Not generating any DTMF tone
if (newTone) {
// Requested to generate a DTMF tone
dtmfgenerator.getSamples(buffer, n, newTone);
currentTone = newTone;
return true;
}
return false;
}
} catch(DTMFException e) {
// invalid key
return false;
}
}