qgstreameraudiooutput.cpp

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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
 
#include <qgstreameraudiooutput_p.h>
#include <qgstreameraudiodevice_p.h>
#include <qaudiodevice.h>
#include <qaudiooutput.h>
 
#include <QtCore/qloggingcategory.h>
#include <QtNetwork/qnetworkaccessmanager.h>
#include <QtNetwork/qnetworkreply.h>
 
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
 
#include <utility>
 
static Q_LOGGING_CATEGORY(qLcMediaAudioOutput, "qt.multimedia.audiooutput")
 
QT_BEGIN_NAMESPACE
 
QMaybe<QPlatformAudioOutput *> QGstreamerAudioOutput::create(QAudioOutput *parent)
{
    QGstElement audioconvert("audioconvert", "audioConvert");
    if (!audioconvert)
        return errorMessageCannotFindElement("audioconvert");
 
    QGstElement audioresample("audioresample", "audioResample");
    if (!audioresample)
        return errorMessageCannotFindElement("audioresample");
 
    QGstElement volume("volume", "volume");
    if (!volume)
        return errorMessageCannotFindElement("volume");
 
    QGstElement autoaudiosink("autoaudiosink", "autoAudioSink");
    if (!autoaudiosink)
        return errorMessageCannotFindElement("autoaudiosink");
 
    return new QGstreamerAudioOutput(audioconvert, audioresample, volume, autoaudiosink, parent);
}
 
QGstreamerAudioOutput::QGstreamerAudioOutput(QGstElement audioconvert, QGstElement audioresample,
                                             QGstElement volume, QGstElement autoaudiosink,
                                             QAudioOutput *parent)
    : QObject(parent),
      QPlatformAudioOutput(parent),
      gstAudioOutput("audioOutput"),
      audioConvert(std::move(audioconvert)),
      audioResample(std::move(audioresample)),
      audioVolume(std::move(volume)),
      audioSink(std::move(autoaudiosink))
{
    audioQueue = QGstElement("queue", "audioQueue");
    gstAudioOutput.add(audioQueue, audioConvert, audioResample, audioVolume, audioSink);
    audioQueue.link(audioConvert, audioResample, audioVolume, audioSink);
 
    gstAudioOutput.addGhostPad(audioQueue, "sink");
}
 
QGstreamerAudioOutput::~QGstreamerAudioOutput()
{
    gstAudioOutput.setStateSync(GST_STATE_NULL);
}
 
void QGstreamerAudioOutput::setVolume(float vol)
{
    audioVolume.set("volume", vol);
}
 
void QGstreamerAudioOutput::setMuted(bool muted)
{
    audioVolume.set("mute", muted);
}
 
void QGstreamerAudioOutput::setPipeline(const QGstPipeline &pipeline)
{
    gstPipeline = pipeline;
}
 
void QGstreamerAudioOutput::setAudioDevice(const QAudioDevice &info)
{
    if (info == m_audioOutput)
        return;
    qCDebug(qLcMediaAudioOutput) << "setAudioOutput" << info.description() << info.isNull();
    m_audioOutput = info;
 
    QGstElement newSink;
#if QT_CONFIG(pulseaudio)
    auto id = m_audioOutput.id();
    newSink = QGstElement("pulsesink", "audiosink");
    if (!newSink.isNull())
        newSink.set("device", id.constData());
    else
        qCWarning(qLcMediaAudioOutput) << "Invalid audio device";
#else
    auto *deviceInfo = static_cast<const QGStreamerAudioDeviceInfo *>(m_audioOutput.handle());
    if (deviceInfo && deviceInfo->gstDevice)
        newSink = gst_device_create_element(deviceInfo->gstDevice , "audiosink");
    else
        qCWarning(qLcMediaAudioOutput) << "Invalid audio device";
#endif
 
    if (newSink.isNull()) {
        qCWarning(qLcMediaAudioOutput) << "Failed to create a gst element for the audio device, using a default audio sink";
        newSink = QGstElement("autoaudiosink", "audiosink");
    }
 
    audioVolume.staticPad("src").doInIdleProbe([&](){
        audioVolume.unlink(audioSink);
        gstAudioOutput.remove(audioSink);
        gstAudioOutput.add(newSink);
        newSink.syncStateWithParent();
        audioVolume.link(newSink);
    });
 
    audioSink.setStateSync(GST_STATE_NULL);
    audioSink = newSink;
}
 
QT_END_NAMESPACE
 
#include "moc_qgstreameraudiooutput_p.cpp"