qt-everywhere-src-5.15.1/qtmultimedia/src/gsttools/qgstreameraudioinputselector.cpp

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#include <QtMultimedia/private/qtmultimediaglobal_p.h>
#include "qgstreameraudioinputselector_p.h"

#include <QtCore/QDir>
#include <QtCore/QDebug>

#include <gst/gst.h>

#if QT_CONFIG(alsa)
#include <alsa/asoundlib.h>
#endif

QGstreamerAudioInputSelector::QGstreamerAudioInputSelector(QObject *parent)
    :QAudioInputSelectorControl(parent)
{
    update();
}

QGstreamerAudioInputSelector::~QGstreamerAudioInputSelector()
{
}

QList<QString> QGstreamerAudioInputSelector::availableInputs() const
{
    return m_names;
}

QString QGstreamerAudioInputSelector::inputDescription(const QString& name) const
{
    QString desc;

    for (int i = 0; i < m_names.size(); i++) {
        if (m_names.at(i).compare(name) == 0) {
            desc = m_descriptions.at(i);
            break;
        }
    }
    return desc;
}

QString QGstreamerAudioInputSelector::defaultInput() const
{
    if (m_names.size() > 0)
        return m_names.at(0);

    return QString();
}

QString QGstreamerAudioInputSelector::activeInput() const
{
    return m_audioInput;
}

void QGstreamerAudioInputSelector::setActiveInput(const QString& name)
{
    if (m_audioInput.compare(name) != 0) {
        m_audioInput = name;
        emit activeInputChanged(name);
    }
}

void QGstreamerAudioInputSelector::update()
{
    m_names.clear();
    m_descriptions.clear();

    //use autoaudiosrc as the first default device
    m_names.append(QLatin1String("default:"));
    m_descriptions.append(tr("System default device"));

    updatePulseDevices();
    updateAlsaDevices();
    updateOssDevices();
    if (m_names.size() > 0)
        m_audioInput = m_names.at(0);
}

void QGstreamerAudioInputSelector::updateAlsaDevices()
{
#if QT_CONFIG(alsa)
    void **hints, **n;
    if (snd_device_name_hint(-1, "pcm", &hints) < 0) {
        qWarning()<<"no alsa devices available";
        return;
    }
    n = hints;

    while (*n != nullptr) {
        char *name = snd_device_name_get_hint(*n, "NAME");
        char *descr = snd_device_name_get_hint(*n, "DESC");
        char *io = snd_device_name_get_hint(*n, "IOID");

        if ((name != nullptr) && (descr != nullptr)) {
            if (io == nullptr || qstrcmp(io, "Input") == 0) {
                m_names.append(QLatin1String("alsa:")+QString::fromUtf8(name));
                m_descriptions.append(QString::fromUtf8(descr));
            }
        }

        free(name);
        free(descr);
        free(io);
        n++;
    }
    snd_device_name_free_hint(hints);
#endif
}

void QGstreamerAudioInputSelector::updateOssDevices()
{
    QDir devDir(QStringLiteral("/dev"));
    devDir.setFilter(QDir::System);
    const QFileInfoList entries = devDir.entryInfoList(QStringList() << QLatin1String("dsp*"));
    for (const QFileInfo& entryInfo : entries) {
        m_names.append(QLatin1String("oss:")+entryInfo.filePath());
        m_descriptions.append(QString::fromLatin1("OSS device %1").arg(entryInfo.fileName()));
    }
}

void QGstreamerAudioInputSelector::updatePulseDevices()
{
    GstElementFactory *factory = gst_element_factory_find("pulsesrc");
    if (factory) {
        m_names.append(QLatin1String("pulseaudio:"));
        m_descriptions.append(QLatin1String("PulseAudio device."));
        gst_object_unref(GST_OBJECT(factory));
    }
}