qalsaaudiodevice.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 "qalsaaudiodevice_p.h"
 
QT_BEGIN_NAMESPACE
 
namespace {
 
QAudioDevicePrivate::AudioDeviceFormat
createAlsaAudioDeviceFormatFromDeviceName(const QByteArray &dev, QAudioDevice::Mode mode)
{
    QAudioDevicePrivate::AudioDeviceFormat format;
 
    // Check surround capabilities
    bool surround40 = false;
    bool surround51 = false;
    bool surround71 = false;
 
    if (mode == QAudioDevice::Output) {
        if (dev.startsWith(QLatin1String("surround40")))
            surround40 = true;
        if (dev.startsWith(QLatin1String("surround51")))
            surround51 = true;
        if (dev.startsWith(QLatin1String("surround71")))
            surround71 = true;
    }
 
    format.minimumChannelCount = 1;
    format.maximumChannelCount = 2;
    if (surround71)
        format.maximumChannelCount = 8;
    else if (surround40)
        format.maximumChannelCount = 4;
    else if (surround51)
        format.maximumChannelCount = 6;
 
    format.minimumSampleRate = 8000;
    format.maximumSampleRate = 48000;
 
    format.supportedSampleFormats = {
        QAudioFormat::UInt8,
        QAudioFormat::Int16,
        QAudioFormat::Int32,
        QAudioFormat::Float,
    };
 
    format.preferredFormat.setChannelCount(mode == QAudioDevice::Input ? 1 : 2);
    format.preferredFormat.setSampleFormat(QAudioFormat::Float);
    format.preferredFormat.setSampleRate(48000);
 
    return format;
}
 
} // namespace
 
QAlsaAudioDeviceInfo::QAlsaAudioDeviceInfo(const QByteArray &dev, const QString &desc,
                                           QAudioDevice::Mode mode)
    : QAudioDevicePrivate(dev, mode, desc, false,
                          createAlsaAudioDeviceFormatFromDeviceName(dev, mode))
{
}
 
QAlsaAudioDeviceInfo::~QAlsaAudioDeviceInfo() = default;
 
QT_END_NAMESPACE