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#include "bbmetadata.h"

#include <QtCore/qdebug.h>
#include <QtCore/qfile.h>
#include <QtCore/qstringlist.h>

QT_BEGIN_NAMESPACE

BbMetaData::BbMetaData()
{
    clear();
}

static const char * durationKey = "md_title_duration";
static const char * widthKey = "md_video_width";
static const char * heightKey = "md_video_height";
static const char * mediaTypeKey = "md_title_mediatype";
static const char * pixelWidthKey = "md_video_pixel_height";
static const char * pixelHeightKey = "md_video_pixel_width";

static const int mediaTypeAudioFlag = 4;
static const int mediaTypeVideoFlag = 2;

bool BbMetaData::parse(const QString &contextName)
{
    clear();
    QString fileName =
            QString("/pps/services/multimedia/renderer/context/%1/metadata").arg(contextName);

    // In newer OS versions, the filename is "metadata0", not metadata, so try both.
    if (!QFile::exists(fileName))
        fileName += '0';

    QFile metaDataFile(fileName);
    if (!metaDataFile.open(QFile::ReadOnly)) {
        qWarning() << "Unable to open media metadata file" << fileName << ":"
                   << metaDataFile.errorString();
        return false;
    }

    const QString separator("::");
    QTextStream stream(&metaDataFile);
    Q_FOREVER {
        const QString line = stream.readLine();
        if (line.isNull())
            break;

        const int separatorPos = line.indexOf(separator);
        if (separatorPos != -1) {
            const QString key = line.left(separatorPos);
            const QString value = line.mid(separatorPos + separator.length());

            if (key == durationKey)
                m_duration = value.toLongLong();
            else if (key == widthKey)
                m_width = value.toInt();
            else if (key == heightKey)
                m_height = value.toInt();
            else if (key == mediaTypeKey)
                m_mediaType = value.toInt();
            else if (key == pixelWidthKey)
                m_pixelWidth = value.toFloat();
            else if (key == pixelHeightKey)
                m_pixelHeight = value.toFloat();
        }
    }

    return true;
}

void BbMetaData::clear()
{
    m_duration = 0;
    m_height = 0;
    m_width = 0;
    m_mediaType = -1;
    m_pixelWidth = 1;
    m_pixelHeight = 1;
}

qlonglong BbMetaData::duration() const
{
    return m_duration;
}

// Handling of pixel aspect ratio
//
// If the pixel aspect ratio is different from 1:1, it means the video needs to be stretched in
// order to look natural.
// For example, if the pixel width is 2, and the pixel height is 1, it means a video of 300x200
// pixels needs to be displayed as 600x200 to look correct.
// In order to support this the easiest way, we simply pretend that the actual size of the video
// is 600x200, which will cause the video to be displayed in an aspect ratio of 3:1 instead of 3:2,
// and therefore look correct.

int BbMetaData::height() const
{
    return m_height * m_pixelHeight;
}

int BbMetaData::width() const
{
    return m_width * m_pixelWidth;
}

bool BbMetaData::hasVideo() const
{
    // By default, assume no video if we can't extract the information
    if (m_mediaType == -1)
        return false;

    return (m_mediaType & mediaTypeVideoFlag);
}

bool BbMetaData::hasAudio() const
{
    // By default, assume audio only if we can't extract the information
    if (m_mediaType == -1)
        return true;

    return (m_mediaType & mediaTypeAudioFlag);
}

QT_END_NAMESPACE
