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**
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** contained in the Technology Preview License Agreement accompanying
** this package.
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** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
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****************************************************************************/

#include "qgstreamerplayersession.h"
#include "qgstreamerbushelper.h"

#include "qgstreamervideorendererinterface.h"

#include <gst/gstvalue.h>

#include <QtCore/qdatetime.h>
#include <QtCore/qdebug.h>

//#define USE_PLAYBIN2

QGstreamerPlayerSession::QGstreamerPlayerSession(QObject *parent)
    :QObject(parent),
     m_state(QMediaPlayer::StoppedState),
     m_mediaStatus(QMediaPlayer::UnknownMediaStatus),
     m_busHelper(0),
     m_playbin(0),
     m_nullVideoOutput(0),
     m_bus(0),
     m_renderer(0),
     m_volume(100),
     m_playbackRate(1.0),
     m_muted(false),
     m_audioAvailable(false),
     m_videoAvailable(false),
     m_seekable(false),
     m_lastPosition(0),
     m_duration(-1)
{
    static bool initialized = false;
    if (!initialized) {
        initialized = true;
        gst_init(NULL, NULL);
    }

#ifdef USE_PLAYBIN2
    m_playbin = gst_element_factory_make("playbin2", NULL);
#else
    m_playbin = gst_element_factory_make("playbin", NULL);
#endif

    if (m_playbin != 0) {
        // Sort out messages
        m_bus = gst_element_get_bus(m_playbin);
        m_busHelper = new QGstreamerBusHelper(m_bus, this);
        connect(m_busHelper, SIGNAL(message(QGstreamerMessage)), SLOT(busMessage(QGstreamerMessage)));
        m_busHelper->installSyncEventFilter(this);

        m_nullVideoOutput = gst_element_factory_make("fakesink", NULL);
        g_object_set(G_OBJECT(m_playbin), "video-sink", m_nullVideoOutput, NULL);

        // Initial volume
        double volume = 1.0;
        g_object_get(G_OBJECT(m_playbin), "volume", &volume, NULL);
        m_volume = int(volume*100);
    }
}

QGstreamerPlayerSession::~QGstreamerPlayerSession()
{
    if (m_playbin) {
        stop();

        delete m_busHelper;
        gst_object_unref(GST_OBJECT(m_bus));
        gst_object_unref(GST_OBJECT(m_playbin));
    }
}

void QGstreamerPlayerSession::load(const QUrl &url)
{
    m_url = url;
    if (m_playbin) {
        m_tags.clear();
        emit tagsChanged();

        g_object_set(G_OBJECT(m_playbin), "uri", m_url.toString().toLocal8Bit().constData(), NULL);

//        if (!m_streamTypes.isEmpty()) {
//            m_streamProperties.clear();
//            m_streamTypes.clear();
//
//            emit streamsChanged();
//        }
    }
}

qint64 QGstreamerPlayerSession::duration() const
{
    return m_duration;
}

qint64 QGstreamerPlayerSession::position() const
{
    GstFormat   format = GST_FORMAT_TIME;
    gint64      position = 0;

    if ( m_playbin && gst_element_query_position(m_playbin, &format, &position))
        return position / 1000000;
    else
        return 0;
}

qreal QGstreamerPlayerSession::playbackRate() const
{
    return m_playbackRate;
}

void QGstreamerPlayerSession::setPlaybackRate(qreal rate)
{
    if (!qFuzzyCompare(m_playbackRate, rate)) {
        m_playbackRate = rate;
        if (m_playbin) {
            gst_element_seek(m_playbin, rate, GST_FORMAT_TIME,
                             GstSeekFlags(GST_SEEK_FLAG_ACCURATE | GST_SEEK_FLAG_FLUSH | GST_SEEK_FLAG_SEGMENT),
                             GST_SEEK_TYPE_NONE,0,
                             GST_SEEK_TYPE_NONE,0 );
        }
    }
}


//int QGstreamerPlayerSession::activeStream(QMediaStreamsControl::StreamType streamType) const
//{
//    int streamNumber = -1;
//    if (m_playbin) {
//        switch (streamType) {
//        case QMediaStreamsControl::AudioStream:
//            g_object_set(G_OBJECT(m_playbin), "current-audio", streamNumber, NULL);
//            break;
//        case QMediaStreamsControl::VideoStream:
//            g_object_set(G_OBJECT(m_playbin), "current-video", streamNumber, NULL);
//            break;
//        case QMediaStreamsControl::SubPictureStream:
//            g_object_set(G_OBJECT(m_playbin), "current-text", streamNumber, NULL);
//            break;
//        default:
//            break;
//        }
//    }
//
//#ifdef USE_PLAYBIN2
//    streamNumber += m_playbin2StreamOffset.value(streamType,0);
//#endif
//
//    return streamNumber;
//}

//void QGstreamerPlayerSession::setActiveStream(QMediaStreamsControl::StreamType streamType, int streamNumber)
//{
//#ifdef USE_PLAYBIN2
//    streamNumber -= m_playbin2StreamOffset.value(streamType,0);
//#endif
//
//    if (m_playbin) {
//        switch (streamType) {
//        case QMediaStreamsControl::AudioStream:
//            g_object_get(G_OBJECT(m_playbin), "current-audio", &streamNumber, NULL);
//            break;
//        case QMediaStreamsControl::VideoStream:
//            g_object_get(G_OBJECT(m_playbin), "current-video", &streamNumber, NULL);
//            break;
//        case QMediaStreamsControl::SubPictureStream:
//            g_object_get(G_OBJECT(m_playbin), "current-text", &streamNumber, NULL);
//            break;
//        default:
//            break;
//        }
//    }
//}


bool QGstreamerPlayerSession::isBuffering() const
{
    return false;
}

int QGstreamerPlayerSession::bufferingProgress() const
{
    return 0;
}

int QGstreamerPlayerSession::volume() const
{
    return m_volume;
}

bool QGstreamerPlayerSession::isMuted() const
{
    return m_muted;
}

bool QGstreamerPlayerSession::isAudioAvailable() const
{
    return m_audioAvailable;
}

void QGstreamerPlayerSession::setVideoRenderer(QObject *videoOutput)
{
    m_renderer = qobject_cast<QGstreamerVideoRendererInterface*>(videoOutput);
    if (m_renderer)
        g_object_set(G_OBJECT(m_playbin), "video-sink", m_renderer->videoSink(), NULL);
    else
        g_object_set(G_OBJECT(m_playbin), "video-sink", m_nullVideoOutput, NULL);
}

bool QGstreamerPlayerSession::isVideoAvailable() const
{
    return m_videoAvailable;
}

bool QGstreamerPlayerSession::isSeekable() const
{
    return m_seekable;
}

void QGstreamerPlayerSession::play()
{
    if (m_playbin) {
        if (gst_element_set_state(m_playbin, GST_STATE_PLAYING) == GST_STATE_CHANGE_FAILURE) {
            qWarning() << "GStreamer; Unable to play -" << m_url.toString();
            m_state = QMediaPlayer::StoppedState;
            m_mediaStatus = QMediaPlayer::InvalidMedia;

            emit stateChanged(m_state);
            emit mediaStatusChanged(m_mediaStatus);
        }
    }
}

void QGstreamerPlayerSession::pause()
{
    if (m_playbin)
        gst_element_set_state(m_playbin, GST_STATE_PAUSED);
}

void QGstreamerPlayerSession::stop()
{
    if (m_playbin) {
        gst_element_set_state(m_playbin, GST_STATE_NULL);

        //we have to do it here, since gstreamer will not emit bus messages any more
        if (m_state != QMediaPlayer::StoppedState)
            emit stateChanged(m_state = QMediaPlayer::StoppedState);
    }
}

void QGstreamerPlayerSession::seek(qint64 ms)
{
    if (m_playbin && m_state != QMediaPlayer::StoppedState) {
        gint64  position = (gint64)ms * 1000000;
        gst_element_seek_simple(m_playbin, GST_FORMAT_TIME, GST_SEEK_FLAG_FLUSH, position);
    }
}

void QGstreamerPlayerSession::setVolume(int volume)
{
    m_volume = volume;
    emit volumeChanged(m_volume);

    if (!m_muted && m_playbin)
        g_object_set(G_OBJECT(m_playbin), "volume", m_volume/100.0, NULL);

}

void QGstreamerPlayerSession::setMuted(bool muted)
{
    m_muted = muted;

    g_object_set(G_OBJECT(m_playbin), "volume", (m_muted ? 0 : m_volume/100.0), NULL);

    emit mutedStateChanged(m_muted);
}

static void addTagToMap(const GstTagList *list,
                        const gchar *tag,
                        gpointer user_data)
{
    QMap<QByteArray, QVariant> *map = reinterpret_cast<QMap<QByteArray, QVariant>* >(user_data);

    GValue val;
    val.g_type = 0;
    gst_tag_list_copy_value(&val,list,tag);

    switch( G_VALUE_TYPE(&val) ) {
        case G_TYPE_STRING:
        {
            const gchar *str_value = g_value_get_string(&val);
            map->insert(QByteArray(tag), QString::fromUtf8(str_value));
            break;
        }
        case G_TYPE_INT:
            map->insert(QByteArray(tag), g_value_get_int(&val));
            break;
        case G_TYPE_UINT:
            map->insert(QByteArray(tag), g_value_get_uint(&val));
            break;
        case G_TYPE_LONG:
            map->insert(QByteArray(tag), qint64(g_value_get_long(&val)));
            break;
        case G_TYPE_BOOLEAN:
            map->insert(QByteArray(tag), g_value_get_boolean(&val));
            break;
        case G_TYPE_CHAR:
            map->insert(QByteArray(tag), g_value_get_char(&val));
            break;
        case G_TYPE_DOUBLE:
            map->insert(QByteArray(tag), g_value_get_double(&val));
            break;
        default:
            // GST_TYPE_DATE is a function, not a constant, so pull it out of the switch
            if (G_VALUE_TYPE(&val) == GST_TYPE_DATE) {
                const GDate *date = gst_value_get_date(&val);
                if (g_date_valid(date)) {
                    int year = g_date_get_year(date);
                    int month = g_date_get_month(date);
                    int day = g_date_get_day(date);
                    map->insert(QByteArray(tag), QDate(year,month,day));
                    if (!map->contains("year"))
                        map->insert("year", year);
                }
            } else if (G_VALUE_TYPE(&val) == GST_TYPE_FRACTION) {
                int nom = gst_value_get_fraction_numerator(&val);
                int denom = gst_value_get_fraction_denominator(&val);

                if (denom > 0) {
                    map->insert(QByteArray(tag), double(nom)/denom);
                }
            }
            break;
    }

    g_value_unset(&val);
}

void QGstreamerPlayerSession::setSeekable(bool seekable)
{
    if (seekable != m_seekable) {
        m_seekable = seekable;
        emit seekableChanged(m_seekable);
    }
}

void QGstreamerPlayerSession::setMediaStatus(QMediaPlayer::MediaStatus status)
{
    if (m_mediaStatus != status) {
        m_mediaStatus = status;
        emit mediaStatusChanged(status);
    }
}

bool QGstreamerPlayerSession::processSyncMessage(const QGstreamerMessage &message)
{
    GstMessage* gm = message.rawMessage();

    if (gm &&
        GST_MESSAGE_TYPE(gm) == GST_MESSAGE_ELEMENT &&
        gst_structure_has_name(gm->structure, "prepare-xwindow-id"))
    {
        if (m_renderer)
            m_renderer->precessNewStream();
        return true;
    }

    return false;
}

void QGstreamerPlayerSession::busMessage(const QGstreamerMessage &message)
{
    GstMessage* gm = message.rawMessage();

    if (gm == 0) {
        // Null message, query current position
        quint32 newPos = position();

        if (newPos/1000 != m_lastPosition) {
            m_lastPosition = newPos/1000;
            emit positionChanged(newPos);
        }

    } else {
        //tag message comes from elements inside playbin, not from playbin itself
        if (GST_MESSAGE_TYPE(gm) == GST_MESSAGE_TAG) {
            //qDebug() << "tag message";
            GstTagList *tag_list;
            gst_message_parse_tag(gm, &tag_list);
            gst_tag_list_foreach(tag_list, addTagToMap, &m_tags);

            //qDebug() << m_tags;

            emit tagsChanged();
        }

        if (GST_MESSAGE_SRC(gm) == GST_OBJECT_CAST(m_playbin)) {
            switch (GST_MESSAGE_TYPE(gm))  {
            case GST_MESSAGE_DURATION:
                break;

            case GST_MESSAGE_STATE_CHANGED:
                {
                    GstState    oldState;
                    GstState    newState;
                    GstState    pending;

                    gst_message_parse_state_changed(gm, &oldState, &newState, &pending);

                    /*QStringList states;
                    states << "GST_STATE_VOID_PENDING" <<  "GST_STATE_NULL" << "GST_STATE_READY" << "GST_STATE_PAUSED" << "GST_STATE_PLAYING";

                    qDebug() << QString("state changed: old: %1  new: %2  pending: %3") \
                            .arg(states[oldState]) \
                            .arg(states[newState]) \
                            .arg(states[pending]);*/

                    switch (newState) {
                    case GST_STATE_VOID_PENDING:
                    case GST_STATE_NULL:
                        setMediaStatus(QMediaPlayer::UnknownMediaStatus);
                        setSeekable(false);
                        if (m_state != QMediaPlayer::StoppedState)
                            emit stateChanged(m_state = QMediaPlayer::StoppedState);
                        break;
                    case GST_STATE_READY:
                        setMediaStatus(QMediaPlayer::LoadedMedia);
                        setSeekable(false);
                        if (m_state != QMediaPlayer::StoppedState)
                            emit stateChanged(m_state = QMediaPlayer::StoppedState);
                        break;
                    case GST_STATE_PAUSED:
                        //don't emit state changes for intermediate states
                        if (m_state != QMediaPlayer::PausedState && pending == GST_STATE_VOID_PENDING)
                            emit stateChanged(m_state = QMediaPlayer::PausedState);

                        setMediaStatus(QMediaPlayer::LoadedMedia);

                        //check for seekable
                        if (oldState == GST_STATE_READY) {
                            /*
                                //gst_element_seek_simple doesn't work reliably here, have to find a better solution

                                GstFormat   format = GST_FORMAT_TIME;
                                gint64      position = 0;
                                bool seekable = false;
                                if (gst_element_query_position(m_playbin, &format, &position)) {
                                    seekable = gst_element_seek_simple(m_playbin, format, GST_SEEK_FLAG_NONE, position);
                                }

                                setSeekable(seekable);
                                */

                            setSeekable(true);

                            if (!qFuzzyCompare(m_playbackRate, qreal(1.0)))
                                setPlaybackRate(m_playbackRate);

                            if (m_renderer)
                                m_renderer->precessNewStream();

                        }


                        break;
                    case GST_STATE_PLAYING:
                        if (oldState == GST_STATE_PAUSED)
                            getStreamsInfo();

                        if (m_state != QMediaPlayer::PlayingState)
                            emit stateChanged(m_state = QMediaPlayer::PlayingState);
                        break;
                    }
                }
                break;

            case GST_MESSAGE_EOS:
                if (m_state != QMediaPlayer::StoppedState)
                    emit stateChanged(m_state = QMediaPlayer::StoppedState);

                setMediaStatus(QMediaPlayer::EndOfMedia);

                emit playbackFinished();
                break;

            case GST_MESSAGE_TAG:
            case GST_MESSAGE_STREAM_STATUS:
            case GST_MESSAGE_UNKNOWN:
            case GST_MESSAGE_ERROR:
            case GST_MESSAGE_WARNING:
            case GST_MESSAGE_INFO:
                break;
            case GST_MESSAGE_BUFFERING:
                setMediaStatus(QMediaPlayer::BufferingMedia);
                break;
            case GST_MESSAGE_STATE_DIRTY:
            case GST_MESSAGE_STEP_DONE:
            case GST_MESSAGE_CLOCK_PROVIDE:
            case GST_MESSAGE_CLOCK_LOST:
            case GST_MESSAGE_NEW_CLOCK:
            case GST_MESSAGE_STRUCTURE_CHANGE:
            case GST_MESSAGE_APPLICATION:
            case GST_MESSAGE_ELEMENT:
            case GST_MESSAGE_SEGMENT_START:
            case GST_MESSAGE_SEGMENT_DONE:
            case GST_MESSAGE_LATENCY:
#if (GST_VERSION_MAJOR >= 0) &&  (GST_VERSION_MINOR >= 10) && (GST_VERSION_MICRO >= 13)
            case GST_MESSAGE_ASYNC_START:
            case GST_MESSAGE_ASYNC_DONE:
#if GST_VERSION_MICRO >= 23
            case GST_MESSAGE_REQUEST_STATE:
#endif
#endif
            case GST_MESSAGE_ANY:
                break;
            }
        }
    }
}

void QGstreamerPlayerSession::getStreamsInfo()
{
    GstFormat   format = GST_FORMAT_TIME;
    gint64      duration = 0;

    if (gst_element_query_duration(m_playbin, &format, &duration)) {
        int newDuration = duration / 1000000;
        if (m_duration != newDuration) {
            m_duration = newDuration;
            emit durationChanged(m_duration);
        }
    }

    //check if video is available:
    bool haveAudio = false;
    bool haveVideo = false;
//    m_streamProperties.clear();
//    m_streamTypes.clear();

#ifdef USE_PLAYBIN2
    gint audioStreamsCount = 0;
    gint videoStreamsCount = 0;
    gint textStreamsCount = 0;

    g_object_get(G_OBJECT(m_playbin), "n-audio", &audioStreamsCount, NULL);
    g_object_get(G_OBJECT(m_playbin), "n-video", &videoStreamsCount, NULL);
    g_object_get(G_OBJECT(m_playbin), "n-text", &textStreamsCount, NULL);

    haveAudio = audioStreamsCount > 0;
    haveVideo = videoStreamsCount > 0;

    m_playbin2StreamOffset[QMediaStreamsControl::AudioStream] = 0;
    m_playbin2StreamOffset[QMediaStreamsControl::VideoStream] = audioStreamsCount;
    m_playbin2StreamOffset[QMediaStreamsControl::SubPictureStream] = audioStreamsCount+videoStreamsCount;

    for (int i=0; i<audioStreamsCount; i++)
        m_streamTypes.append(QMediaStreamsControl::AudioStream);

    for (int i=0; i<videoStreamsCount; i++)
        m_streamTypes.append(QMediaStreamsControl::VideoStream);

    for (int i=0; i<textStreamsCount; i++)
        m_streamTypes.append(QMediaStreamsControl::SubPictureStream);

    for (int i=0; i<m_streamTypes.count(); i++) {
        QMediaStreamsControl::StreamType streamType = m_streamTypes[i];
        QMap<QtMedia::MetaData, QVariant> streamProperties;

        int streamIndex = i - m_playbin2StreamOffset[streamType];

        GstTagList *tags = 0;
        switch (streamType) {
        case QMediaStreamsControl::AudioStream:
            g_signal_emit_by_name(G_OBJECT(m_playbin), "get-audio-tags", streamIndex, &tags);
            break;
        case QMediaStreamsControl::VideoStream:
            g_signal_emit_by_name(G_OBJECT(m_playbin), "get-video-tags", streamIndex, &tags);
            break;
        case QMediaStreamsControl::SubPictureStream:
            g_signal_emit_by_name(G_OBJECT(m_playbin), "get-text-tags", streamIndex, &tags);
            break;
        default:
            break;
        }

        if (tags && gst_is_tag_list(tags)) {
            gchar *languageCode = 0;
            if (gst_tag_list_get_string(tags, GST_TAG_LANGUAGE_CODE, &languageCode))
                streamProperties[QtMedia::Language] = QString::fromUtf8(languageCode);

            //qDebug() << "language for setream" << i << QString::fromUtf8(languageCode);
            g_free (languageCode);
        }

        m_streamProperties.append(streamProperties);
    }

#else
    enum {
        GST_STREAM_TYPE_UNKNOWN,
        GST_STREAM_TYPE_AUDIO,
        GST_STREAM_TYPE_VIDEO,
        GST_STREAM_TYPE_TEXT,
        GST_STREAM_TYPE_SUBPICTURE,
        GST_STREAM_TYPE_ELEMENT
    };

    GList*      streamInfo;
    g_object_get(G_OBJECT(m_playbin), "stream-info", &streamInfo, NULL);

    for (; streamInfo != 0; streamInfo = g_list_next(streamInfo)) {
        gint        type;
        gchar *languageCode = 0;

        GObject*    obj = G_OBJECT(streamInfo->data);

        g_object_get(obj, "type", &type, NULL);
        g_object_get(obj, "language-code", &languageCode, NULL);

        if (type == GST_STREAM_TYPE_VIDEO)
            haveVideo = true;
        else if (type == GST_STREAM_TYPE_AUDIO)
            hasAudio = true;

//        QMediaStreamsControl::StreamType streamType = QMediaStreamsControl::UnknownStream;
//
//        switch (type) {
//        case GST_STREAM_TYPE_VIDEO:
//            streamType = QMediaStreamsControl::VideoStream;
//            break;
//        case GST_STREAM_TYPE_AUDIO:
//            streamType = QMediaStreamsControl::AudioStream;
//            break;
//        case GST_STREAM_TYPE_SUBPICTURE:
//            streamType = QMediaStreamsControl::SubPictureStream;
//            break;
//        default:
//            streamType = QMediaStreamsControl::UnknownStream;
//            break;
//        }
//
//        QMap<QtMedia::MetaData, QVariant> streamProperties;
//        streamProperties[QtMedia::Language] = QString::fromUtf8(languageCode);
//
//        m_streamProperties.append(streamProperties);
//        m_streamTypes.append(streamType);
    }
#endif

    if (haveAudio != m_audioAvailable) {
        m_audioAvailable = haveAudio;
        emit audioAvailableChanged(m_audioAvailable);
    }
    if (haveVideo != m_videoAvailable) {
        m_videoAvailable = haveVideo;
        emit videoAvailableChanged(m_videoAvailable);
    }

    emit streamsChanged();
}