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#include "directshowplayercontrol.h"

#include "directshowplayerservice.h"

#include <QtCore/qcoreapplication.h>

#include <QtCore/qmath.h>

static int volumeToDecibels(int volume)

{

    if (volume == 0) {

        return -10000;

    } else if (volume == 100) {

        return 0;

#ifdef QT_USE_MATH_H_FLOATS

    } else if (sizeof(qreal) == sizeof(float)) {

        return qRound(::log10f(float(volume) / 100) * 5000);

#endif

    } else {

        return qRound(::log10(qreal(volume) / 100) * 5000);

    }

}

static int decibelsToVolume(int dB)

{

    if (dB == -10000) {

        return 0;

    } else if (dB == 0) {

        return 100;

    } else {

        return qRound(100 * qPow(10, qreal(dB) / 5000));

    }

}

DirectShowPlayerControl::DirectShowPlayerControl(DirectShowPlayerService *service, QObject *parent)

    : QMediaPlayerControl(parent)

    , m_service(service)

    , m_audio(0)

    , m_updateProperties(0)

    , m_state(QMediaPlayer::StoppedState)

    , m_status(QMediaPlayer::UnknownMediaStatus)

    , m_error(QMediaPlayer::NoError)

    , m_streamTypes(0)

    , m_muteVolume(-1)

    , m_position(0)

    , m_duration(0)

    , m_playbackRate(0)

    , m_seekable(false)

{

}

DirectShowPlayerControl::~DirectShowPlayerControl()

{

    if (m_audio)

        m_audio->Release();

}

QMediaPlayer::State DirectShowPlayerControl::state() const

{

    return m_state;

}

QMediaPlayer::MediaStatus DirectShowPlayerControl::mediaStatus() const

{

    return m_status;

}

qint64 DirectShowPlayerControl::duration() const

{

    return m_duration;

}

qint64 DirectShowPlayerControl::position() const

{

    return const_cast<qint64 &>(m_position) = m_service->position();

}

void DirectShowPlayerControl::setPosition(qint64 position)

{

    m_service->seek(position);

}

int DirectShowPlayerControl::volume() const

{

    if (m_muteVolume >= 0) {

        return m_muteVolume;

    } else if (m_audio) {

        long dB = 0;

        m_audio->get_Volume(&dB);

        return decibelsToVolume(dB);

    } else {

        return 0;

    }

}

void DirectShowPlayerControl::setVolume(int volume)

{

    int boundedVolume = qBound(0, volume, 100);

    if (m_muteVolume >= 0) {

        m_muteVolume = boundedVolume;

        emit volumeChanged(m_muteVolume);

    } else if (m_audio) {

        m_audio->put_Volume(volumeToDecibels(volume));

        emit volumeChanged(boundedVolume);

    }

}

bool DirectShowPlayerControl::isMuted() const

{

    return m_muteVolume >= 0;

}

void DirectShowPlayerControl::setMuted(bool muted)

{

    if (muted && m_muteVolume < 0) {

        if (m_audio) {

            long dB = 0;

            m_audio->get_Volume(&dB);

            m_muteVolume = decibelsToVolume(dB);

            m_audio->put_Volume(-10000);

        } else {

            m_muteVolume = 0;

        }

        emit mutedChanged(muted);

    } else if (!muted && m_muteVolume >= 0) {

        if (m_audio) {

            m_audio->put_Volume(volumeToDecibels(m_muteVolume));

        }

        m_muteVolume = -1;

        emit mutedChanged(muted);

    }

}

int DirectShowPlayerControl::bufferStatus() const

{

    return m_service->bufferStatus();

}

bool DirectShowPlayerControl::isAudioAvailable() const

{

    return m_streamTypes & DirectShowPlayerService::AudioStream;

}

bool DirectShowPlayerControl::isVideoAvailable() const

{

    return m_streamTypes & DirectShowPlayerService::VideoStream;

}

bool DirectShowPlayerControl::isSeekable() const

{

    return m_seekable;

}

QMediaTimeRange DirectShowPlayerControl::availablePlaybackRanges() const

{

    return m_service->availablePlaybackRanges();

}

qreal DirectShowPlayerControl::playbackRate() const

{

    return m_playbackRate;

}

void DirectShowPlayerControl::setPlaybackRate(qreal rate)

{

    if (m_playbackRate != rate) {

        m_service->setRate(rate);

        emit playbackRateChanged(m_playbackRate = rate);

    }

}

QMediaContent DirectShowPlayerControl::media() const

{

    return m_media;

}

const QIODevice *DirectShowPlayerControl::mediaStream() const

{

    return m_stream;

}

void DirectShowPlayerControl::setMedia(const QMediaContent &media, QIODevice *stream)

{

    m_media = media;

    m_stream = stream;

    m_updateProperties &= PlaybackRateProperty;

    m_service->load(media, stream);

    emitPropertyChanges();

}

void DirectShowPlayerControl::play()

{

    m_service->play();

    emit stateChanged(m_state = QMediaPlayer::PlayingState);

}

void DirectShowPlayerControl::pause()

{

    m_service->pause();

    emit stateChanged(m_state = QMediaPlayer::PausedState);

}

void DirectShowPlayerControl::stop()

{

    m_service->stop();

    emit stateChanged(m_state = QMediaPlayer::StoppedState);

}

void DirectShowPlayerControl::customEvent(QEvent *event)

{

    if (event->type() == QEvent::Type(PropertiesChanged)) {

        emitPropertyChanges();

        event->accept();

    } else {

        QMediaPlayerControl::customEvent(event);

    }

}

void DirectShowPlayerControl::emitPropertyChanges()

{

    int properties = m_updateProperties;

    m_updateProperties = 0;

    if ((properties & ErrorProperty) && m_error != QMediaPlayer::NoError)

        emit error(m_error, m_errorString);

    if (properties & PlaybackRateProperty)

        emit playbackRateChanged(m_playbackRate);

    if (properties & StreamTypesProperty) {

        emit audioAvailableChanged(m_streamTypes & DirectShowPlayerService::AudioStream);

        emit videoAvailableChanged(m_streamTypes & DirectShowPlayerService::VideoStream);

    }

    if (properties & PositionProperty)

        emit positionChanged(m_position);

    if (properties & DurationProperty)

        emit durationChanged(m_duration);

    if (properties & SeekableProperty)

        emit seekableChanged(m_seekable);

    if (properties & StatusProperty)

        emit mediaStatusChanged(m_status);

    if (properties & StateProperty)

        emit stateChanged(m_state);

}

void DirectShowPlayerControl::scheduleUpdate(int properties)

{

    if (m_updateProperties == 0)

        QCoreApplication::postEvent(this, new QEvent(QEvent::Type(PropertiesChanged)));

    m_updateProperties |= properties;

}

void DirectShowPlayerControl::updateState(QMediaPlayer::State state)

{

    if (m_state != state) {

        m_state = state;

        scheduleUpdate(StateProperty);

    }

}

void DirectShowPlayerControl::updateStatus(QMediaPlayer::MediaStatus status)

{

    if (m_status != status) {

        m_status = status;

        scheduleUpdate(StatusProperty);

    }

}

void DirectShowPlayerControl::updateMediaInfo(qint64 duration, int streamTypes, bool seekable)

{

    int properties = 0;

    if (m_duration != duration) {

        m_duration = duration;

        properties |= DurationProperty;

    }

    if (m_streamTypes != streamTypes) {

        m_streamTypes = streamTypes;

        properties |= StreamTypesProperty;

    }

    if (m_seekable != seekable) {

        m_seekable = seekable;

        properties |= SeekableProperty;

    }

    if (properties != 0)

        scheduleUpdate(properties);

}

void DirectShowPlayerControl::updatePlaybackRate(qreal rate)

{

    if (m_playbackRate != rate) {

        m_playbackRate = rate;

        scheduleUpdate(PlaybackRateProperty);

    }

}

void DirectShowPlayerControl::updateAudioOutput(IBaseFilter *filter)

{

    if (m_audio)

        m_audio->Release();

    m_audio = com_cast<IBasicAudio>(filter, IID_IBasicAudio);

}

void DirectShowPlayerControl::updateError(QMediaPlayer::Error error, const QString &errorString)

{

    m_error = error;

    m_errorString = errorString;

    if (m_error != QMediaPlayer::NoError)

        scheduleUpdate(ErrorProperty);

}

void DirectShowPlayerControl::updatePosition(qint64 position)

{

    if (m_position != position) {

        m_position = position;

        scheduleUpdate(PositionProperty);

    }

}