qt-everywhere-src-5.14.1/qtmultimedia/src/plugins/wasapi/qwasapiaudiodeviceinfo.cpp

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#include "qwasapiaudiodeviceinfo.h"
#include "qwasapiutils.h"

#include <Audioclient.h>

QT_BEGIN_NAMESPACE

Q_LOGGING_CATEGORY(lcMmDeviceInfo, "qt.multimedia.deviceinfo")

QWasapiAudioDeviceInfo::QWasapiAudioDeviceInfo(QByteArray dev, QAudio::Mode mode)
    : m_deviceName(QString::fromLocal8Bit(dev))
{
    qCDebug(lcMmDeviceInfo) << __FUNCTION__ << dev << mode;
    m_interface = QWasapiUtils::createOrGetInterface(dev, mode);

    QAudioFormat referenceFormat = m_interface->m_mixFormat;

    const int rates[] = {8000, 11025, 16000, 22050, 32000, 44100, 48000, 88200, 96000, 192000};
    for (int rate : rates) {
        QAudioFormat f = referenceFormat;
        f.setSampleRate(rate);
        if (isFormatSupported(f))
            m_sampleRates.append(rate);
    }

    for (int i = 1; i <= 18; ++i) {
        QAudioFormat f = referenceFormat;
        f.setChannelCount(i);
        if (isFormatSupported(f))
            m_channelCounts.append(i);
    }

    const int sizes[] = {8, 12, 16, 20, 24, 32, 64};
    for (int s : sizes) {
        QAudioFormat f = referenceFormat;
        f.setSampleSize(s);
        if (isFormatSupported(f))
            m_sampleSizes.append(s);
    }

    referenceFormat.setSampleType(QAudioFormat::SignedInt);
    if (isFormatSupported(referenceFormat))
        m_sampleTypes.append(QAudioFormat::SignedInt);

    referenceFormat.setSampleType(QAudioFormat::Float);
    if (isFormatSupported(referenceFormat))
        m_sampleTypes.append(QAudioFormat::Float);
}

QWasapiAudioDeviceInfo::~QWasapiAudioDeviceInfo()
{
    qCDebug(lcMmDeviceInfo) << __FUNCTION__;
}

bool QWasapiAudioDeviceInfo::isFormatSupported(const QAudioFormat& format) const
{
    qCDebug(lcMmDeviceInfo) << __FUNCTION__ << format;

    WAVEFORMATEX nfmt;
    if (!QWasapiUtils::convertToNativeFormat(format, &nfmt))
        return false;

    WAVEFORMATEX closest;
    WAVEFORMATEX *pClosest = &closest;
    HRESULT hr;
    hr = m_interface->m_client->IsFormatSupported(AUDCLNT_SHAREMODE_SHARED, &nfmt, &pClosest);

    if (hr == S_OK) // S_FALSE is inside SUCCEEDED()
        return true;

    if (lcMmDeviceInfo().isDebugEnabled()) {
        QAudioFormat f;
        QWasapiUtils::convertFromNativeFormat(pClosest, &f);
        qCDebug(lcMmDeviceInfo) << __FUNCTION__ << hr << "Closest match is:" << f;
    }

    return false;
}

QAudioFormat QWasapiAudioDeviceInfo::preferredFormat() const
{
    qCDebug(lcMmDeviceInfo) << __FUNCTION__;
    return m_interface->m_mixFormat;
}

QString QWasapiAudioDeviceInfo::deviceName() const
{
    qCDebug(lcMmDeviceInfo) << __FUNCTION__;
    return m_deviceName;
}

QStringList QWasapiAudioDeviceInfo::supportedCodecs()
{
    qCDebug(lcMmDeviceInfo) << __FUNCTION__;
    return QStringList() << QStringLiteral("audio/pcm");
}

QList<int> QWasapiAudioDeviceInfo::supportedSampleRates()
{
    qCDebug(lcMmDeviceInfo) << __FUNCTION__;
    return m_sampleRates;
}

QList<int> QWasapiAudioDeviceInfo::supportedChannelCounts()
{
    qCDebug(lcMmDeviceInfo) << __FUNCTION__;
    return m_channelCounts;
}

QList<int> QWasapiAudioDeviceInfo::supportedSampleSizes()
{
    qCDebug(lcMmDeviceInfo) << __FUNCTION__;
    return m_sampleSizes;
}

QList<QAudioFormat::Endian> QWasapiAudioDeviceInfo::supportedByteOrders()
{
    qCDebug(lcMmDeviceInfo) << __FUNCTION__;
    return QList<QAudioFormat::Endian>() << m_interface->m_mixFormat.byteOrder();
}

QList<QAudioFormat::SampleType> QWasapiAudioDeviceInfo::supportedSampleTypes()
{
    qCDebug(lcMmDeviceInfo) << __FUNCTION__;
    return m_sampleTypes;
}

QT_END_NAMESPACE