C++ MusicMetadata::setRating方法代码示例

/*!
 * \copydoc MetaIO::read()
 */
MusicMetadata *MetaIOID3::read(const QString &filename)
{
    if (!OpenFile(filename))
        return nullptr;

    TagLib::ID3v2::Tag *tag = GetID3v2Tag(true); // Create tag if none are found

    // if there is no ID3v2 tag, try to read the ID3v1 tag and copy it to
    // the ID3v2 tag structure
    if (tag->isEmpty())
    {
        TagLib::ID3v1::Tag *tag_v1 = GetID3v1Tag();

        if (!tag_v1)
            return nullptr;

        if (!tag_v1->isEmpty())
        {
            tag->setTitle(tag_v1->title());
            tag->setArtist(tag_v1->artist());
            tag->setAlbum(tag_v1->album());
            tag->setTrack(tag_v1->track());
            tag->setYear(tag_v1->year());
            tag->setGenre(tag_v1->genre());
        }
    }

    MusicMetadata *metadata = new MusicMetadata(filename);

    ReadGenericMetadata(tag, metadata);

    bool compilation = false;

    // Compilation Artist (TPE4 Remix) or fallback to (TPE2 Band)
    // N.B. The existance of a either frame is NOT an indication that this
    // is a compilation, but if it is then one of them will probably hold
    // the compilation artist.
    TextIdentificationFrame *tpeframe = nullptr;
    TagLib::ID3v2::FrameList tpelist = tag->frameListMap()["TPE4"];
    if (tpelist.isEmpty() || tpelist.front()->toString().isEmpty())
        tpelist = tag->frameListMap()["TPE2"];
    if (!tpelist.isEmpty())
        tpeframe = (TextIdentificationFrame *)tpelist.front();

    if (tpeframe && !tpeframe->toString().isEmpty())
    {
        QString compilation_artist = TStringToQString(tpeframe->toString())
                                                                    .trimmed();
        metadata->setCompilationArtist(compilation_artist);
    }

    // Rating and playcount, stored in POPM frame
    PopularimeterFrame *popm = findPOPM(tag, ""); // Global (all apps) tag

    // If no 'global' tag exists, look for the MythTV specific one
    if (!popm)
    {
        popm = findPOPM(tag, email);
    }

    // Fallback to using any POPM tag we can find
    if (!popm)
    {
        if (!tag->frameListMap()["POPM"].isEmpty())
            popm = dynamic_cast<PopularimeterFrame *>
                                        (tag->frameListMap()["POPM"].front());
    }

    if (popm)
    {
        int rating = popm->rating();
        rating = lroundf(static_cast<float>(rating) / 255.0f * 10.0f);
        metadata->setRating(rating);
        metadata->setPlaycount(popm->counter());
    }

    // Look for MusicBrainz Album+Artist ID in TXXX Frame
    UserTextIdentificationFrame *musicbrainz = find(tag,
                                            "MusicBrainz Album Artist Id");

    if (musicbrainz)
    {
        // If the MusicBrainz ID is the special "Various Artists" ID
        // then compilation is TRUE
        if (!compilation && !musicbrainz->fieldList().isEmpty())
        {
            TagLib::StringList l = musicbrainz->fieldList();
            for (TagLib::StringList::ConstIterator it = l.begin(); it != l.end(); it++)
            {
                QString ID = TStringToQString((*it));

                if (ID == MYTH_MUSICBRAINZ_ALBUMARTIST_UUID)
                {
                    compilation = true;
                    break;
                }
            }
//.........这里部分代码省略.........

static int UpdateMeta(const MythUtilCommandLineParser &cmdline)
{
    bool ok = true;
    int result = GENERIC_EXIT_OK;

    if (cmdline.toString("songid").isEmpty())
    {
        LOG(VB_GENERAL, LOG_ERR, "Missing --songid option");
        return GENERIC_EXIT_INVALID_CMDLINE;
    }
    int songID = cmdline.toInt("songid");

    MusicMetadata *mdata = MusicMetadata::createFromID(songID);
    if (!mdata)
    {
        LOG(VB_GENERAL, LOG_ERR, QString("Cannot find metadata for trackid: %1").arg(songID));
        return GENERIC_EXIT_NOT_OK;
    }

    if (!cmdline.toString("title").isEmpty())
        mdata->setTitle(cmdline.toString("title"));

    if (!cmdline.toString("artist").isEmpty())
        mdata->setArtist(cmdline.toString("artist"));

    if (!cmdline.toString("album").isEmpty())
        mdata->setAlbum(cmdline.toString("album"));

    if (!cmdline.toString("genre").isEmpty())
        mdata->setGenre(cmdline.toString("genre"));

    if (!cmdline.toString("trackno").isEmpty())
        mdata->setTrack(cmdline.toInt("trackno"));

    if (!cmdline.toString("year").isEmpty())
        mdata->setYear(cmdline.toInt("year"));

    if (!cmdline.toString("rating").isEmpty())
        mdata->setRating(cmdline.toInt("rating"));

    if (!cmdline.toString("playcount").isEmpty())
        mdata->setPlaycount(cmdline.toInt("playcount"));

    if (!cmdline.toString("lastplayed").isEmpty())
        mdata->setLastPlay(cmdline.toDateTime("lastplayed"));

    mdata->dumpToDatabase();

    MetaIO *tagger = mdata->getTagger();
    if (tagger)
    {
        ok = tagger->write(mdata->getLocalFilename(), mdata);

        if (!ok)
            LOG(VB_GENERAL, LOG_ERR, QString("Failed to write to tag for trackid: %1").arg(songID));
    }

    // tell any clients that the metadata for this track has changed
    gCoreContext->SendMessage(QString("MUSIC_METADATA_CHANGED %1").arg(songID));

    if (!ok)
        result = GENERIC_EXIT_NOT_OK;

    return result;
}