dtmf.cpp

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/*
 *  Copyright (C) 2004-2025 Savoir-faire Linux Inc.
 *
 *  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, see <https://www.gnu.org/licenses/>.
 */
 
#include "dtmf.h"
 
namespace jami {
 
DTMF::DTMF(unsigned int sampleRate, AVSampleFormat sampleFormat)
    : currentTone_(0)
    , newTone_(0)
    , dtmfgenerator_(sampleRate, sampleFormat)
{}
 
void
DTMF::startTone(char code)
{
    newTone_ = code;
}
 
bool
DTMF::generateDTMF(AVFrame* buffer)
{
    try {
        if (currentTone_ != 0) {
            // Currently generating a DTMF tone
            if (currentTone_ == newTone_) {
                // Continue generating the same tone
                dtmfgenerator_.getNextSamples(buffer);
                return true;
            } else if (newTone_ != 0) {
                // New tone requested
                dtmfgenerator_.getSamples(buffer, 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, newTone_);
                currentTone_ = newTone_;
                return true;
            } else
                return false;
        }
    } catch (const DTMFException& e) {
        // invalid key
        return false;
    }
}
 
} // namespace jami