qalsamediadevices.cpp

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// Copyright (C) 2021 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 "qalsamediadevices_p.h"
#include "qmediadevices.h"
#include "qcameradevice_p.h"
 
#include "private/qalsaaudiosource_p.h"
#include "private/qalsaaudiosink_p.h"
#include "private/qalsaaudiodevice_p.h"
 
#include <alsa/asoundlib.h>
 
QT_BEGIN_NAMESPACE
 
QAlsaMediaDevices::QAlsaMediaDevices()
    : QPlatformMediaDevices()
{
}
 
static QList<QAudioDevice> availableDevices(QAudioDevice::Mode mode)
{
    QList<QAudioDevice> devices;
 
    QByteArray filter;
 
    // Create a list of all current audio devices that support mode
    void **hints, **n;
    char *name, *descr, *io;
 
    if(snd_device_name_hint(-1, "pcm", &hints) < 0) {
        qWarning() << "no alsa devices available";
        return devices;
    }
    n = hints;
 
    if(mode == QAudioDevice::Input) {
        filter = "Input";
    } else {
        filter = "Output";
    }
 
    while (*n != NULL) {
        name = snd_device_name_get_hint(*n, "NAME");
        if (name != 0 && qstrcmp(name, "null") != 0) {
            descr = snd_device_name_get_hint(*n, "DESC");
            io = snd_device_name_get_hint(*n, "IOID");
 
            if ((descr != NULL) && ((io == NULL) || (io == filter))) {
                auto *infop = new QAlsaAudioDeviceInfo(name, QString::fromUtf8(descr), mode);
                devices.append(infop->create());
                if (strcmp(name, "default") == 0)
                    infop->isDefault = true;
            }
 
            free(descr);
            free(io);
        }
        free(name);
        ++n;
    }
    snd_device_name_free_hint(hints);
 
    return devices;
}
 
QList<QAudioDevice> QAlsaMediaDevices::audioInputs() const
{
    return availableDevices(QAudioDevice::Input);
}
 
QList<QAudioDevice> QAlsaMediaDevices::audioOutputs() const
{
    return availableDevices(QAudioDevice::Output);
}
 
QPlatformAudioSource *QAlsaMediaDevices::createAudioSource(const QAudioDevice &deviceInfo,
                                                           QObject *parent)
{
    return new QAlsaAudioSource(deviceInfo.id(), parent);
}
 
QPlatformAudioSink *QAlsaMediaDevices::createAudioSink(const QAudioDevice &deviceInfo,
                                                       QObject *parent)
{
    return new QAlsaAudioSink(deviceInfo.id(), parent);
}
 
QT_END_NAMESPACE