lena_pi/LenaPi/models/MusicModel.cpp

#include "MusicModel.h"
#include <QDir>
#include <QDebug>
#include <VLCQtCore/Media.h>

MusicModel::MusicModel(VlcInstance* instance, QObject *parent) : QObject(parent),
   mVlc(instance), mMedia(new VlcMediaList(instance))
{
    /* nothing */
}

MusicModel::~MusicModel()
{
    // do not delete! will cause segmentation fault
    //if(mMedia)
    //   mMedia->deleteLater();
}

void MusicModel::init(NavigationItemModel *item)
{
    if(mCurrentItem == item){
        return;
    }
    mCurrentItem = item;
    emit currentItemChanged();

    reset();
    clearMediaList();

    readMedia(mCurrentItem->getPath());

    setMediaTitle(mMedia->at(0));
}

void MusicModel::navigateBack()
{
    emit navigateTo(mCurrentItem);
}

void MusicModel::playPause()
{
    mIsPlaying = !mIsPlaying;
    emit isPlayingChanged();
    if(mIsPlaying)
        emit play();
    else
        emit pause();
}

void MusicModel::stopMusic()
{
    if(mIsPlaying){
        mIsPlaying = false;
        emit isPlayingChanged();

        reset();

        emit stop();
    }
}

void MusicModel::playNext()
{
    emit next();
    if(!mIsPlaying){
        mIsPlaying = true;
        emit isPlayingChanged();
    }
}

void MusicModel::playPrevious()
{
    emit previous();
    if(!mIsPlaying){
        mIsPlaying = true;
        emit isPlayingChanged();
    }
}

NavigationItemModel *MusicModel::getCurrentItem()
{
    return mCurrentItem;
}

VlcMediaList *MusicModel::getMedia()
{
    return mMedia;
}

bool MusicModel::isPlaying() const
{
    return mIsPlaying;
}

bool MusicModel::hasNext() const
{
    return mHasNext;
}

bool MusicModel::hasPrevious() const
{
    return mHasPrevious;
}

void MusicModel::setAudioVolume(int newVolume)
{
    if(newVolume != mAudioVolume){
        if(newVolume > 100){
            mAudioVolume = 100;
        } else if(newVolume < 0){
            mAudioVolume = 0;
        } else {
            mAudioVolume = newVolume;
        }
        emit audioVolumeChanged(mAudioVolume);
    }
}

double MusicModel::getProgress() const
{
    return mCurrentMediaItemProgress;
}

QString MusicModel::getMediaTitle() const
{
    return mMediaTitle;
}

QString MusicModel::getMediaLength()
{
    return timeToString(mCurrentMediaItemLength);
}

QString MusicModel::getTime()
{
    return timeToString(mCurrentTime);
}

void MusicModel::onNextMediaSet(VlcMedia *media)
{
    setMediaTitle(media);

    mHasNext = true;
    mHasPrevious = true;
    if(mMedia->at(0) == media){
        mHasPrevious = false;
    }
    if(mMedia->at(mMedia->count()-1) == media){
        mHasNext = false;
    }
    emit hasPreviousChanged();
    emit hasNextChanged();
}

void MusicModel::onTimeChanged(int time)
{
    mCurrentMediaItemProgress = (double) time / mCurrentMediaItemLength;
    mCurrentTime = time;
    emit progressChanged();
}

void MusicModel::onLengthChanged(int length)
{
    mCurrentMediaItemLength= length;
    emit mediaLengthChanged();
}

void MusicModel::reset()
{
    mHasNext = false;
    mHasPrevious = false;
    emit hasNextChanged();
    emit hasPreviousChanged();

    mCurrentMediaItemProgress = 0.0;
    mCurrentTime = 0.0;
    emit progressChanged();

    mCurrentMediaItemLength = 0.0;
    emit mediaLengthChanged();
}

void MusicModel::clearMediaList()
{
    while(mMedia->count() > 0){
        mMedia->removeMedia(0);
    }
}

void MusicModel::readMedia(const QString& path)
{
    auto dir = QDir(path);
    if(!dir.exists()) return;

    auto fileNames = dir.entryList(QDir::Files);
    for(auto file:fileNames){
        if(file.endsWith(".flac") || file.endsWith(".mp3")){
            mMedia->addMedia(new VlcMedia(dir.filePath(file), true, mVlc));
        }
    }
}

QString MusicModel::timeToString(int time)
{
    int sec = time/1000;
    int min = sec/60;
    sec = sec-min*60;
    QString secStr = (sec < 10) ? "0"+QString::number(sec) : QString::number(sec);
    return QString::number(min) + ":" + secStr;
}

void MusicModel::setMediaTitle(VlcMedia *media)
{
    auto list = media->currentLocation().split("/");
    auto title = list.at(list.count() -1 );
    mMediaTitle = title.left(title.lastIndexOf("."));
    emit mediaTitleChanged();
}