qalsaaudiosink_p.h

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists for the convenience
// of other Qt classes.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
 
#ifndef QAUDIOOUTPUTALSA_H
#define QAUDIOOUTPUTALSA_H
 
#include <alsa/asoundlib.h>
 
#include <QtCore/qfile.h>
#include <QtCore/qdebug.h>
#include <QtCore/qtimer.h>
#include <QtCore/qstring.h>
#include <QtCore/qstringlist.h>
#include <QtCore/qelapsedtimer.h>
#include <QtCore/qiodevice.h>
 
#include <QtMultimedia/qaudio.h>
#include <QtMultimedia/qaudiodevice.h>
#include <private/qaudiosystem_p.h>
 
QT_BEGIN_NAMESPACE
 
class QAlsaAudioSink : public QPlatformAudioSink
{
    friend class AlsaOutputPrivate;
    Q_OBJECT
public:
    QAlsaAudioSink(const QByteArray &device, QObject *parent);
    ~QAlsaAudioSink();
 
    qint64 write( const char *data, qint64 len );
 
    void start(QIODevice* device) override;
    QIODevice* start() override;
    void stop() override;
    void reset() override;
    void suspend() override;
    void resume() override;
    qsizetype bytesFree() const override;
    void setBufferSize(qsizetype value) override;
    qsizetype bufferSize() const override;
    qint64 processedUSecs() const override;
    QAudio::Error error() const override;
    QAudio::State state() const override;
    void setFormat(const QAudioFormat& fmt) override;
    QAudioFormat format() const override;
    void setVolume(qreal) override;
    qreal volume() const override;
 
 
    QIODevice* audioSource = nullptr;
    QAudioFormat settings;
    QAudio::Error errorState = QAudio::NoError;
    QAudio::State deviceState = QAudio::StoppedState;
    QAudio::State suspendedInState = QAudio::SuspendedState;
 
private slots:
    void userFeed();
    bool deviceReady();
 
signals:
    void processMore();
 
private:
    bool opened = false;
    bool pullMode = true;
    bool resuming = false;
    int buffer_size = 0;
    int period_size = 0;
    qint64 totalTimeValue = 0;
    unsigned int buffer_time = 100000;
    unsigned int period_time = 20000;
    snd_pcm_uframes_t buffer_frames;
    snd_pcm_uframes_t period_frames;
    int xrun_recovery(int err);
 
    int setFormat();
    bool open();
    void close();
 
    QTimer* timer = nullptr;
    QByteArray m_device;
    int bytesAvailable = 0;
    qint64 elapsedTimeOffset = 0;
    char* audioBuffer = nullptr;
    snd_pcm_t* handle = nullptr;
    snd_pcm_access_t access = SND_PCM_ACCESS_RW_INTERLEAVED;
    snd_pcm_hw_params_t *hwparams = nullptr;
    qreal m_volume = 1.0f;
};
 
class AlsaOutputPrivate : public QIODevice
{
    friend class QAlsaAudioSink;
    Q_OBJECT
public:
    AlsaOutputPrivate(QAlsaAudioSink* audio);
    ~AlsaOutputPrivate();
 
    qint64 readData( char* data, qint64 len) override;
    qint64 writeData(const char* data, qint64 len) override;
 
private:
    QAlsaAudioSink *audioDevice;
};
 
QT_END_NAMESPACE
 
 
#endif