C++ MusicMetadata::setCompilation方法代码示例

void Ripper::compilationChanged(bool state)
{
    if (!state)
    {
        if (m_tracks->size() > 0)
        {
            // Update artist MetaData of each track on the ablum...
            for (int trackno = 0; trackno < m_tracks->size(); ++trackno)
            {
                MusicMetadata *data = m_tracks->at(trackno)->metadata;
                if (data)
                {
                    data->setCompilationArtist("");
                    data->setArtist(m_artistName);
                    data->setCompilation(false);
                }
            }
        }

        m_switchTitleArtist->SetVisible(false);
    }
    else
    {
        if (m_tracks->size() > 0)
        {
            // Update artist MetaData of each track on the album...
            for (int trackno = 0; trackno < m_tracks->size(); ++trackno)
            {
                MusicMetadata *data;
                data = m_tracks->at(trackno)->metadata;

                if (data)
                {
                    data->setCompilationArtist(m_artistName);
                    data->setCompilation(true);
                }
            }
        }

        m_switchTitleArtist->SetVisible(true);
    }

    BuildFocusList();
    updateTrackList();
}

//.........这里部分代码省略.........
                    if (!compilation_artist.isEmpty() &&
                            artist != compilation_artist)
                        isCompilation = true;

                    album = cdtext_get_const(CDTEXT_TITLE, cdtext);

                    if (genre.isNull())
                        genre = cdtext_get_const(CDTEXT_GENRE, cdtext);

                    cdtext_destroy(cdtext);
                }
            }
            else
            {
                if (s_iCdtext < 0)
                    LOG(VB_MEDIA, LOG_INFO, "No cdtext title for track");
                s_iCdtext = 0;
            }
        }
        else
        {
            if (s_iCdtext < 0)
                LOG(VB_MEDIA, LOG_INFO, "No cdtext");
            s_iCdtext = 0;
        }
    }

    if (title.isEmpty() || artist.isEmpty() || album.isEmpty())
#endif // CDTEXT
    {
        // CDDB lookup
        Cddb::Toc toc;
        Cddb::Matches r;
        if (Cddb::Query(r, GetToc(cdio, toc)))
        {
            Cddb::Matches::match_t::const_iterator select = r.matches.begin();

            if (r.matches.size() > 1)
            {
                // TODO prompt user to select one
                // In the meantime, select the first non-generic genre
                for (Cddb::Matches::match_t::const_iterator it = select;
                    it != r.matches.end(); ++it)
                {
                    QString g = it->discGenre.toLower();
                    if (g != "misc" && g != "data")
                    {
                        select = it;
                        break;
                    }
                }
            }

            Cddb::Album info;
            if (Cddb::Read(info, select->discGenre, select->discID))
            {
                isCompilation = info.isCompilation;

                if (info.genre.toLower() != "unknown")
                    genre = info.genre[0].toTitleCase() + info.genre.mid(1);
                else
                    genre = info.discGenre[0].toTitleCase() + info.discGenre.mid(1);;

                album = info.title;
                compilation_artist = info.artist;
                year = info.year;

                if (info.tracks.size() >= tracknum)
                {
                    const Cddb::Track& track = info.tracks[tracknum - 1];
                    title = track.title;
                    artist = track.artist;
                }

                // Create a temporary local alias for future lookups
                if (r.discID != info.discID)
                    Cddb::Alias(info, r.discID);
            }
        }
    }

    if (compilation_artist.toLower().left(7) == "various")
        compilation_artist = QObject::tr("Various Artists");

    if (artist.isEmpty())
    {
        artist = compilation_artist;
        compilation_artist.clear();
    }

    if (title.isEmpty())
        title = QObject::tr("Track %1").arg(tracknum);

    MusicMetadata *m = new MusicMetadata(getFilename(), artist, compilation_artist,
        album, title, genre, year, tracknum, length);
    if (m)
        m->setCompilation(isCompilation);

    return m;
}

/*!
 * \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.........

/*!
 * \copydoc MetaIO::read()
 */
MusicMetadata* MetaIOMP4::read(const QString &filename)
{
    QString title, artist, album, genre;
    int year = 0, tracknum = 0, length = 0;
    bool compilation = false;

    AVFormatContext* p_context = NULL;
    AVInputFormat* p_inputformat = NULL;

    QByteArray local8bit = filename.toLocal8Bit();
    if ((avformat_open_input(&p_context, local8bit.constData(),
                             p_inputformat, NULL) < 0))
    {
        return NULL;
    }

    if (avformat_find_stream_info(p_context, NULL) < 0)
        return NULL;

#if 0
    //### Debugging, enable to dump a list of all field names/values found

    AVDictionaryEntry *tag = av_dict_get(p_context->metadata, "\0", NULL,
                                         AV_METADATA_IGNORE_SUFFIX);
    while (tag != NULL)
    {
        LOG(VB_GENERAL, LOG_DEBUG, QString("Tag: %1 Value: %2")
                .arg(tag->key) .arg(QString::fromUtf8(tag->value)));
        tag = av_dict_get(p_context->metadata, "\0", tag,
                          AV_METADATA_IGNORE_SUFFIX);
    }
    //####
#endif

    title = getFieldValue(p_context, "title");
    if (title.isEmpty())
    {
        readFromFilename(filename, artist, album, title, genre, tracknum);
    }
    else
    {
        title = getFieldValue(p_context, "title");
        artist = getFieldValue(p_context, "author");
        // Author is the correct fieldname, but
        // we've been saving to artist for years
        if (artist.isEmpty())
            artist = getFieldValue(p_context, "artist");
        album = getFieldValue(p_context, "album");
        year = getFieldValue(p_context, "year").toInt();
        genre = getFieldValue(p_context, "genre");
        tracknum = getFieldValue(p_context, "track").toInt();
        compilation = getFieldValue(p_context, "").toInt();
        length = getTrackLength(p_context);
    }

    metadataSanityCheck(&artist, &album, &title, &genre);

    MusicMetadata *retdata = new MusicMetadata(filename,
                                     artist,
                                     compilation ? artist : "",
                                     album,
                                     title,
                                     genre,
                                     year,
                                     tracknum,
                                     length);

    retdata->setCompilation(compilation);

    avformat_close_input(&p_context);

    return retdata;
}