qt-everywhere-src-5.15.1/qtmultimedia/src/plugins/qnx-audio/audio/qnxaudiodeviceinfo.cpp

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#include "qnxaudiodeviceinfo.h"

#include "qnxaudioutils.h"

#include <sys/asoundlib.h>

QT_BEGIN_NAMESPACE

QnxAudioDeviceInfo::QnxAudioDeviceInfo(const QString &deviceName, QAudio::Mode mode)
    : m_name(deviceName),
      m_mode(mode)
{
}

QnxAudioDeviceInfo::~QnxAudioDeviceInfo()
{
}

QAudioFormat QnxAudioDeviceInfo::preferredFormat() const
{
    QAudioFormat format;
    if (m_mode == QAudio::AudioOutput) {
        format.setSampleRate(44100);
        format.setChannelCount(2);
        format.setByteOrder(QAudioFormat::LittleEndian);
        format.setSampleType(QAudioFormat::SignedInt);
        format.setSampleSize(16);
        format.setCodec(QLatin1String("audio/pcm"));
    } else {
        format.setSampleRate(8000);
        format.setChannelCount(1);
        format.setSampleType(QAudioFormat::UnSignedInt);
        format.setSampleSize(8);
        format.setCodec(QLatin1String("audio/pcm"));
        if (!isFormatSupported(format)) {
            format.setChannelCount(2);
            format.setSampleSize(16);
            format.setSampleType(QAudioFormat::SignedInt);
        }
    }
    return format;
}

bool QnxAudioDeviceInfo::isFormatSupported(const QAudioFormat &format) const
{
    if (!format.codec().startsWith(QLatin1String("audio/pcm")))
        return false;

    const int pcmMode = (m_mode == QAudio::AudioOutput) ? SND_PCM_OPEN_PLAYBACK : SND_PCM_OPEN_CAPTURE;
    snd_pcm_t *handle;

    int card = 0;
    int device = 0;
    if (snd_pcm_open_preferred(&handle, &card, &device, pcmMode) < 0)
        return false;

    snd_pcm_channel_info_t info;
    memset (&info, 0, sizeof(info));
    info.channel = (m_mode == QAudio::AudioOutput) ? SND_PCM_CHANNEL_PLAYBACK : SND_PCM_CHANNEL_CAPTURE;

    if (snd_pcm_plugin_info(handle, &info) < 0) {
        qWarning("QAudioDeviceInfo: couldn't get channel info");
        snd_pcm_close(handle);
        return false;
    }

    snd_pcm_channel_params_t params = QnxAudioUtils::formatToChannelParams(format, m_mode, info.max_fragment_size);
    const int errorCode = snd_pcm_plugin_params(handle, &params);
    snd_pcm_close(handle);

    return errorCode == 0;
}

QString QnxAudioDeviceInfo::deviceName() const
{
    return m_name;
}

QStringList QnxAudioDeviceInfo::supportedCodecs()
{
    return QStringList() << QLatin1String("audio/pcm");
}

QList<int> QnxAudioDeviceInfo::supportedSampleRates()
{
    return QList<int>() << 8000 << 11025 << 22050 << 44100 << 48000;
}

QList<int> QnxAudioDeviceInfo::supportedChannelCounts()
{
    return QList<int>() << 1 << 2;
}

QList<int> QnxAudioDeviceInfo::supportedSampleSizes()
{
    return QList<int>() << 8 << 16 << 32;
}

QList<QAudioFormat::Endian> QnxAudioDeviceInfo::supportedByteOrders()
{
    return QList<QAudioFormat::Endian>() << QAudioFormat::LittleEndian << QAudioFormat::BigEndian;
}

QList<QAudioFormat::SampleType> QnxAudioDeviceInfo::supportedSampleTypes()
{
    return QList<QAudioFormat::SampleType>() << QAudioFormat::SignedInt << QAudioFormat::UnSignedInt << QAudioFormat::Float;
}

QT_END_NAMESPACE