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CAudio.cpp
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CAudio.cpp
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/*
* Copyright (C) 2017
* Albrecht Lohofener (albrechtloh@gmx.de)
*
* This file is part of the welle.io.
* Many of the ideas as implemented in welle.io are derived from
* other work, made available through the GNU general Public License.
* All copyrights of the original authors are recognized.
*
* welle.io 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 2 of the License, or
* (at your option) any later version.
*
* welle.io 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 welle.io; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <QDebug>
#include <stdio.h>
#include "CAudio.h"
CAudio::CAudio(RingBuffer<int16_t>* Buffer)
{
AudioOutput = NULL;
CardRate = 0;
this->Buffer = Buffer;
AudioIODevice = new CAudioIODevice(Buffer, this);
init(48000);
connect(&CheckAudioBufferTimer, SIGNAL(timeout()), this, SLOT(checkAudioBufferTimeout()));
// Check audio state every 1 s, start audio if bytes are available
CheckAudioBufferTimer.start(1000);
}
CAudio::~CAudio(void)
{
delete AudioOutput;
delete AudioIODevice;
}
void CAudio::setRate(int sampleRate)
{
if (CardRate != sampleRate) {
qDebug() << "Audio:"
<< "Sample rate" << sampleRate << "Hz";
CardRate = sampleRate;
init(sampleRate);
}
}
void CAudio::init(int sampleRate)
{
if (AudioOutput != NULL) {
delete AudioOutput;
AudioOutput = NULL;
}
AudioFormat.setSampleRate(sampleRate);
AudioFormat.setChannelCount(2);
AudioFormat.setSampleSize(16);
AudioFormat.setCodec("audio/pcm");
AudioFormat.setByteOrder(QAudioFormat::LittleEndian);
AudioFormat.setSampleType(QAudioFormat::SignedInt);
QAudioDeviceInfo info(QAudioDeviceInfo::defaultOutputDevice());
if (!info.isFormatSupported(AudioFormat)) {
qDebug() << "Audio:"
<< "Raw audio format not supported by backend, cannot play audio.";
return;
}
AudioOutput = new QAudioOutput(AudioFormat, this);
connect(AudioOutput, SIGNAL(stateChanged(QAudio::State)), this, SLOT(handleStateChanged(QAudio::State)));
AudioIODevice->start();
AudioOutput->start(AudioIODevice);
}
void CAudio::stop(void)
{
AudioIODevice->stop();
AudioOutput->stop();
}
void CAudio::handleStateChanged(QAudio::State newState)
{
CurrentState = newState;
switch (newState) {
case QAudio::ActiveState:
qDebug() << "Audio:"
<< "ActiveState";
break;
case QAudio::SuspendedState:
qDebug() << "Audio:"
<< "SuspendedState";
break;
case QAudio::StoppedState:
qDebug() << "Audio:"
<< "StoppedState";
break;
case QAudio::IdleState:
qDebug() << "Audio:"
<< "IdleState";
// Necessary to avoid a IdleState, ActiveState, IdleState, ActiveState ... loop under Ubuntu. I don't know why.
AudioOutput->stop();
break;
default:
qDebug() << "Audio:"
<< "Unknown state:" << newState;
break;
}
}
void CAudio::checkAudioBufferTimeout()
{
int32_t Bytes = Buffer->GetRingBufferReadAvailable();
// Start audio if bytes are available and audio is not active
if (AudioOutput && Bytes && CurrentState != QAudio::ActiveState) {
AudioIODevice->start();
AudioOutput->start(AudioIODevice);
}
}
CAudioIODevice::CAudioIODevice(RingBuffer<int16_t>* Buffer, QObject* parent)
: QIODevice(parent)
{
this->Buffer = Buffer;
}
CAudioIODevice::~CAudioIODevice()
{
}
void CAudioIODevice::start()
{
open(QIODevice::ReadOnly);
}
void CAudioIODevice::stop()
{
Buffer->FlushRingBuffer();
close();
}
qint64 CAudioIODevice::readData(char* data, qint64 len)
{
qint64 total = 0;
total = Buffer->getDataFromBuffer(data, len / 2); // we have int16 samples
// If the buffer is empty return zeros.
if(total == 0)
{
memset(data, 0, len);
total = len;
}
return total * 2;
}
qint64 CAudioIODevice::writeData(const char* data, qint64 len)
{
Q_UNUSED(data);
Q_UNUSED(len);
return 0;
}
qint64 CAudioIODevice::bytesAvailable() const
{
return Buffer->GetRingBufferReadAvailable();
}