qtmultimedia/src/plugins/audiocapture/audioencodercontrol.cpp

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#include "audioencodercontrol.h"
#include "audiocapturesession.h"

#include <qaudioformat.h>

#include <QtCore/qdebug.h>

AudioEncoderControl::AudioEncoderControl(QObject *parent)
    :QAudioEncoderSettingsControl(parent)
{
    m_session = qobject_cast<AudioCaptureSession*>(parent);

    QT_PREPEND_NAMESPACE(QAudioFormat) fmt;
    fmt.setSampleSize(8);
    fmt.setChannelCount(1);
    fmt.setSampleRate(8000);
    fmt.setSampleType(QT_PREPEND_NAMESPACE(QAudioFormat)::SignedInt);
    fmt.setCodec("audio/pcm");
    fmt.setByteOrder(QAudioFormat::LittleEndian);
    m_session->setFormat(fmt);

    m_settings.setEncodingMode(QtMultimedia::ConstantQualityEncoding);
    m_settings.setCodec("audio/pcm");
    m_settings.setBitRate(8000);
    m_settings.setChannelCount(1);
    m_settings.setSampleRate(8000);
    m_settings.setQuality(QtMultimedia::LowQuality);
}

AudioEncoderControl::~AudioEncoderControl()
{
}

QStringList AudioEncoderControl::supportedAudioCodecs() const
{
    QStringList list;
    if (m_session->supportedContainers().size() > 0)
        list.append("audio/pcm");

    return list;
}

QString AudioEncoderControl::codecDescription(const QString &codecName) const
{
    if (codecName.contains(QLatin1String("audio/pcm")))
        return tr("PCM audio data");

    return QString();
}

QList<int> AudioEncoderControl::supportedSampleRates(const QAudioEncoderSettings &, bool *continuous) const
{
    if (continuous)
        *continuous = false;

    return m_session->deviceInfo()->supportedSampleRates();
}

QAudioEncoderSettings AudioEncoderControl::audioSettings() const
{
    return m_settings;
}

void AudioEncoderControl::setAudioSettings(const QAudioEncoderSettings &settings)
{
    QAudioFormat fmt = m_session->format();

    if (settings.encodingMode() == QtMultimedia::ConstantQualityEncoding) {
        if (settings.quality() == QtMultimedia::LowQuality) {
            fmt.setSampleSize(8);
            fmt.setChannelCount(1);
            fmt.setSampleRate(8000);
            fmt.setSampleType(QAudioFormat::UnSignedInt);

        } else if (settings.quality() == QtMultimedia::NormalQuality) {
            fmt.setSampleSize(16);
            fmt.setChannelCount(1);
            fmt.setSampleRate(22050);
            fmt.setSampleType(QAudioFormat::SignedInt);

        } else {
            fmt.setSampleSize(16);
            fmt.setChannelCount(1);
            fmt.setSampleRate(44100);
            fmt.setSampleType(QAudioFormat::SignedInt);
        }

    } else {
        fmt.setChannelCount(settings.channelCount());
        fmt.setSampleRate(settings.sampleRate());
        if (settings.sampleRate() == 8000 && settings.bitRate() == 8000) {
            fmt.setSampleType(QAudioFormat::UnSignedInt);
            fmt.setSampleSize(8);
        } else {
            fmt.setSampleSize(16);
            fmt.setSampleType(QAudioFormat::SignedInt);
        }
    }
    fmt.setCodec("audio/pcm");

    m_session->setFormat(fmt);
    m_settings = settings;
}