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#include "audiooutput.h"
#include <QAudioFormat>
#include <QDebug>
#include <QtConcurrent/qtconcurrentrun.h>
#include <QFuture>
#include <QWaitCondition>
#include <QCoreApplication>
#include <QThreadPool>
#if QT_VERSION < QT_VERSION_CHECK( 6, 0, 0 )
#include <QAudioOutput>
#else
#include <QAudioSink>
#endif
#include <QtGlobal>
#include <QBuffer>
// take reference from this file (https://github.com/valbok/QtAVPlayer/blob/6cc30e484b354d59511c9a60fabced4cb7c57c8e/src/QtAVPlayer/qavaudiooutput.cpp)
// and make some changes.
static QAudioFormat format( int sampleRate, int channelCount )
{
QAudioFormat out;
out.setSampleRate( sampleRate );
out.setChannelCount( channelCount );
#if QT_VERSION < QT_VERSION_CHECK( 6, 0, 0 )
out.setByteOrder( QAudioFormat::LittleEndian );
out.setCodec( QLatin1String( "audio/pcm" ) );
#endif
#if QT_VERSION < QT_VERSION_CHECK( 6, 0, 0 )
out.setSampleSize( 16 );
out.setSampleType( QAudioFormat::SignedInt );
#else
out.setSampleFormat( QAudioFormat::Int16 );
#endif
return out;
}
class AudioOutputPrivate: public QIODevice
{
public:
AudioOutputPrivate()
{
open( QIODevice::ReadOnly );
threadPool.setMaxThreadCount( 1 );
}
QFuture< void > audioPlayFuture;
#if QT_VERSION < QT_VERSION_CHECK( 6, 0, 0 )
using AudioOutput = QAudioOutput;
#else
using AudioOutput = QAudioSink;
#endif
AudioOutput * audioOutput = nullptr;
QByteArray buffer;
qint64 offset = 0;
bool quit = 0;
QMutex mutex;
QWaitCondition cond;
QThreadPool threadPool;
int sampleRate = 0;
int channels = 0;
void setAudioFormat( int _sampleRate, int _channels )
{
sampleRate = _sampleRate;
channels = _channels;
}
qint64 readData( char * data, qint64 len ) override
{
if( !len )
return 0;
QMutexLocker locker( &mutex );
qint64 bytesWritten = 0;
while( len && !quit )
{
if( buffer.isEmpty() )
{
// Wait for more frames
if( bytesWritten == 0 )
cond.wait( &mutex );
if( buffer.isEmpty() )
break;
}
auto sampleData = buffer.data();
const int toWrite = qMin( (qint64) buffer.size(), len );
memcpy( &data[bytesWritten], sampleData, toWrite );
buffer.remove( 0, toWrite );
bytesWritten += toWrite;
// data += toWrite;
len -= toWrite;
}
return bytesWritten;
}
qint64 writeData( const char *, qint64 ) override { return 0; }
qint64 size() const override { return buffer.size(); }
qint64 bytesAvailable() const override { return buffer.size(); }
bool isSequential() const override { return true; }
bool atEnd() const override { return buffer.isEmpty(); }
void init( const QAudioFormat & fmt )
{
if( !audioOutput || ( fmt.isValid() && audioOutput->format() != fmt )
|| audioOutput->state() == QAudio::StoppedState )
{
if( audioOutput )
audioOutput->deleteLater();
audioOutput = new AudioOutput( fmt );
QObject::connect( audioOutput, &AudioOutput::stateChanged, audioOutput, [ & ]( QAudio::State state ) {
switch( state )
{
case QAudio::StoppedState:
if( audioOutput->error() != QAudio::NoError )
qWarning() << "QAudioOutput stopped:" << audioOutput->error();
break;
default:
break;
}
} );
audioOutput->start( this );
}
// audioOutput->setVolume(volume);
}
void doPlayAudio()
{
while( !quit )
{
QMutexLocker locker( &mutex );
cond.wait( &mutex, 10 );
auto fmt = sampleRate == 0 ? QAudioFormat() : format( sampleRate, channels );
locker.unlock();
if( fmt.isValid() )
init( fmt );
QCoreApplication::processEvents();
}
if( audioOutput )
{
audioOutput->stop();
audioOutput->deleteLater();
}
audioOutput = nullptr;
}
};
AudioOutput::AudioOutput( QObject * parent ): QObject( parent ), d_ptr( new AudioOutputPrivate )
{
#if QT_VERSION < QT_VERSION_CHECK( 6, 0, 0 )
d_ptr->audioPlayFuture = QtConcurrent::run( &d_ptr->threadPool, d_ptr.data(), &AudioOutputPrivate::doPlayAudio );
#else
d_ptr->audioPlayFuture = QtConcurrent::run( &d_ptr->threadPool, &AudioOutputPrivate::doPlayAudio, d_ptr.data() );
#endif
}
void AudioOutput::setAudioFormat( int sampleRate, int channels ) { d_ptr->setAudioFormat( sampleRate, channels ); }
AudioOutput::~AudioOutput()
{
Q_D( AudioOutput );
d->quit = true;
d->cond.wakeAll();
d->audioPlayFuture.waitForFinished();
}
bool AudioOutput::play( const uint8_t * data, qint64 len )
{
Q_D( AudioOutput );
if( d->quit )
return false;
QMutexLocker locker( &d->mutex );
auto cuint = const_cast< uint8_t * >( data );
auto cptr = reinterpret_cast< char * >( cuint );
d->buffer.append( cptr, len );
d->cond.wakeAll();
return true;
}
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