C++ MusicMetadata类代码示例

void SearchView::ShowMenu(void)
{
    if (GetFocusWidget() == m_tracksList)
    {
        QString label = tr("Search Actions");

        MythMenu *menu = new MythMenu(label, this, "searchviewmenu");

        MythUIButtonListItem *item = m_tracksList->GetItemCurrent();
        if (item)
        {
            MusicMetadata *mdata = qVariantValue<MusicMetadata*> (item->GetData());
            if (mdata)
            {
                if (gPlayer->getCurrentPlaylist() && gPlayer->getCurrentPlaylist()->checkTrack(mdata->ID()))
                    menu->AddItem(tr("Remove From Playlist"));
                else
                {
                    menu->AddItem(tr("Add To Playlist"));
                    menu->AddItem(tr("Add To Playlist And Play"));
                }
            }
        }

        if (GetFocusWidget() == m_tracksList || GetFocusWidget() == m_currentPlaylist)
            menu->AddItem(tr("Search List..."));

        menu->AddItem(tr("More Options"), NULL, createSubMenu());

        MythScreenStack *popupStack = GetMythMainWindow()->GetStack("popup stack");

        MythDialogBox *menuPopup = new MythDialogBox(menu, popupStack, "actionmenu");

        if (menuPopup->Create())
            popupStack->AddScreen(menuPopup);
        else
            delete menu;
    }
    else
        MusicCommon::ShowMenu();
}

void Ripper::ScanFinished()
{
    delete m_scanThread;
    m_scanThread = nullptr;

    m_tracks->clear();

    if (m_decoder)
    {
        MusicMetadata *metadata;
        bool isCompilation = false;

        m_artistName.clear();
        m_albumName.clear();
        m_genreName.clear();
        m_year.clear();

        for (int trackno = 0; trackno < m_decoder->getNumTracks(); trackno++)
        {
            RipTrack *ripTrack = new RipTrack;

            metadata = m_decoder->getMetadata(trackno + 1);
            if (metadata)
            {
                ripTrack->metadata = metadata;
                ripTrack->length = metadata->Length();

                if (metadata->Compilation())
                {
                    isCompilation = true;
                    m_artistName = metadata->CompilationArtist();
                }
                else if (m_artistName.isEmpty())
                {
                    m_artistName = metadata->Artist();
                }

                if (m_albumName.isEmpty())
                    m_albumName = metadata->Album();

                if (m_genreName.isEmpty() && !metadata->Genre().isEmpty())
                    m_genreName = metadata->Genre();

                if (m_year.isEmpty() && metadata->Year() > 0)
                    m_year = QString::number(metadata->Year());

                QString title = metadata->Title();
                ripTrack->isNew = isNewTune(m_artistName, m_albumName, title);

                ripTrack->active = ripTrack->isNew;

                m_tracks->push_back(ripTrack);

            }
            else
                delete ripTrack;
        }

        m_artistEdit->SetText(m_artistName);
        m_albumEdit->SetText(m_albumName);
        m_genreEdit->SetText(m_genreName);
        m_yearEdit->SetText(m_year);
        m_compilationCheck->SetCheckState(isCompilation);

        if (!isCompilation)
            m_switchTitleArtist->SetVisible(false);
        else
            m_switchTitleArtist->SetVisible(true);
    }

    BuildFocusList();
    updateTrackList();

    CloseBusyPopup();
}

void CDRipperThread::run(void)
{
    RunProlog();

    if (m_tracks->size() <= 0)
    {
        RunEpilog();
        return;
    }

    m_totalSectors = 0;
    m_totalSectorsDone = 0;
    for (int trackno = 0; trackno < m_tracks->size(); trackno++)
    {
        m_totalSectors += getSectorCount(m_CDdevice, trackno + 1);
    }

    if (!m_totalSectors)
    {
        RunEpilog();
        return;
    }

    MusicMetadata *track = m_tracks->at(0)->metadata;
    QString tots;

    if (track->Compilation())
    {
        tots = track->CompilationArtist() + " ~ " + track->Album();
    }
    else
    {
        tots = track->Artist() + " ~ " + track->Album();
    }

    QApplication::postEvent(
        m_parent,
        new RipStatusEvent(RipStatusEvent::kOverallTextEvent, tots));
    QApplication::postEvent(
        m_parent,
        new RipStatusEvent(RipStatusEvent::kOverallProgressEvent, 0));
    QApplication::postEvent(
        m_parent,
        new RipStatusEvent(RipStatusEvent::kTrackProgressEvent, 0));

    QString textstatus;
    QString encodertype = gCoreContext->GetSetting("EncoderType");
    bool mp3usevbr = gCoreContext->GetNumSetting("Mp3UseVBR", 0);

    QApplication::postEvent(m_parent,
        new RipStatusEvent(RipStatusEvent::kOverallStartEvent, m_totalSectors));

    if (LCD *lcd = LCD::Get())
    {
        QString lcd_tots = tr("Importing %1").arg(tots);
        QList<LCDTextItem> textItems;
        textItems.append(LCDTextItem(1, ALIGN_CENTERED,
                                         lcd_tots, "Generic", false));
        lcd->switchToGeneric(textItems);
    }

    MusicMetadata *titleTrack = nullptr;
    QString saveDir = GetConfDir() + "/tmp/RipTemp/";
    QString outfile;

    std::unique_ptr<Encoder> encoder;

    for (int trackno = 0; trackno < m_tracks->size(); trackno++)
    {
        if (isCancelled())
            break;

        QApplication::postEvent(
            m_parent,
            new RipStatusEvent(RipStatusEvent::kStatusTextEvent,
                               QString("Track %1 of %2")
                               .arg(trackno + 1).arg(m_tracks->size())));

        QApplication::postEvent(
            m_parent,
            new RipStatusEvent(RipStatusEvent::kTrackProgressEvent, 0));

        track = m_tracks->at(trackno)->metadata;

        if (track)
        {
            textstatus = track->Title();
            QApplication::postEvent(
                m_parent,
                new RipStatusEvent(
                    RipStatusEvent::kTrackTextEvent, textstatus));
            QApplication::postEvent(
                m_parent,
                new RipStatusEvent(RipStatusEvent::kTrackProgressEvent, 0));
            QApplication::postEvent(
                m_parent,
                new RipStatusEvent(RipStatusEvent::kTrackPercentEvent, 0));

            // do we need to start a new file?
            if (m_tracks->at(trackno)->active)
//.........这里部分代码省略.........

bool avfDecoder::initialize()
{
    m_inited = m_userStop = m_finish = false;
    m_freq = m_bitrate = 0;
    m_stat = m_channels = 0;
    m_seekTime = -1.0;

    // give up if we dont have an audiooutput set
    if (!output())
    {
        error("avfDecoder: initialise called with a NULL audiooutput");
        return false;
    }

    if (!m_outputBuffer)
    {
        error("avfDecoder: couldn't allocate memory");
        return false;
    }

    output()->PauseUntilBuffered();

    if (m_inputContext)
        delete m_inputContext;

    m_inputContext = new RemoteAVFormatContext(getURL());

    if (!m_inputContext->isOpen())
    {
        error(QString("Could not open url  (%1)").arg(m_url));
        deinit();
        return false;
    }

    // if this is a ice/shoutcast or MMS stream start polling for metadata changes and buffer status
    if (getURL().startsWith("http://") || getURL().startsWith("mmsh://"))
    {
        m_mdataTimer = new QTimer;
        m_mdataTimer->setSingleShot(false);
        connect(m_mdataTimer, SIGNAL(timeout()), this, SLOT(checkMetatdata()));

        m_mdataTimer->start(500);

        // we don't get metadata updates for MMS streams so grab the metadata from the headers
        if (getURL().startsWith("mmsh://"))
        {
            AVDictionaryEntry *tag = nullptr;
            MusicMetadata mdata =  gPlayer->getDecoderHandler()->getMetadata();

            tag = av_dict_get(m_inputContext->getContext()->metadata, "title", tag, AV_DICT_IGNORE_SUFFIX);
            mdata.setTitle(tag->value);

            tag = av_dict_get(m_inputContext->getContext()->metadata, "artist", tag, AV_DICT_IGNORE_SUFFIX);
            mdata.setArtist(tag->value);

            mdata.setAlbum("");
            mdata.setLength(-1);

            DecoderHandlerEvent ev(DecoderHandlerEvent::Meta, mdata);
            dispatch(ev);
        }
    }

    // determine the stream format
    // this also populates information needed for metadata
    if (avformat_find_stream_info(m_inputContext->getContext(), nullptr) < 0)
    {
        error("Could not determine the stream format.");
        deinit();
        return false;
    }

    // let FFmpeg finds the best audio stream (should only be one), also catter
    // should the file/stream not be an audio one
    AVCodec *codec;
    int selTrack = av_find_best_stream(m_inputContext->getContext(), AVMEDIA_TYPE_AUDIO,
                                       -1, -1, &codec, 0);

    if (selTrack < 0)
    {
        error(QString("Could not find audio stream."));
        deinit();
        return false;
    }

    // Store the audio codec of the stream
    m_audioDec = gCodecMap->getCodecContext
        (m_inputContext->getContext()->streams[selTrack]);

    // Store the input format of the context
    m_inputFormat = m_inputContext->getContext()->iformat;

    if (avcodec_open2(m_audioDec, codec, nullptr) < 0)
    {
        error(QString("Could not open audio codec: %1")
            .arg(m_audioDec->codec_id));
        deinit();
        return false;
    }

//.........这里部分代码省略.........

/*!
 * \brief Insert file details into database.
 *        If it is an audio file, read the metadata and insert
 *        that information at the same time.
 *
 *        If it is an image file, just insert the filename and
 *        type.
 *
 * \param filename Full path to file.
 *
 * \returns Nothing.
 */
void MusicFileScanner::AddFileToDB(const QString &filename)
{
    QString extension = filename.section( '.', -1 ) ;
    QString directory = filename;
    directory.remove(0, m_startdir.length());
    directory = directory.section( '/', 0, -2);

    QString nameFilter = gCoreContext->GetSetting("AlbumArtFilter", "*.png;*.jpg;*.jpeg;*.gif;*.bmp");

    // If this file is an image, insert the details into the music_albumart table
    if (nameFilter.indexOf(extension.toLower()) > -1)
    {
        QString name = filename.section( '/', -1);

        MSqlQuery query(MSqlQuery::InitCon());
        query.prepare("INSERT INTO music_albumart SET filename = :FILE, "
                      "directory_id = :DIRID, imagetype = :TYPE;");
        query.bindValue(":FILE", name);
        query.bindValue(":DIRID", m_directoryid[directory]);
        query.bindValue(":TYPE", AlbumArtImages::guessImageType(name));

        if (!query.exec() || query.numRowsAffected() <= 0)
        {
            MythDB::DBError("music insert artwork", query);
        }
        return;
    }

    LOG(VB_FILE, LOG_INFO,
        QString("Reading metadata from %1").arg(filename));
    MusicMetadata *data = MetaIO::readMetadata(filename);
    if (data)
    {
        data->setFileSize((quint64)QFileInfo(filename).size());

        QString album_cache_string;

        // Set values from cache
        int did = m_directoryid[directory];
        if (did > 0)
            data->setDirectoryId(did);

        int aid = m_artistid[data->Artist().toLower()];
        if (aid > 0)
        {
            data->setArtistId(aid);

            // The album cache depends on the artist id
            album_cache_string = data->getArtistId() + "#"
                                 + data->Album().toLower();

            if (m_albumid[album_cache_string] > 0)
                data->setAlbumId(m_albumid[album_cache_string]);
        }

        int gid = m_genreid[data->Genre().toLower()];
        if (gid > 0)
            data->setGenreId(gid);

        // Commit track info to database
        data->dumpToDatabase();

        // Update the cache
        m_artistid[data->Artist().toLower()] =
            data->getArtistId();

        m_genreid[data->Genre().toLower()] =
            data->getGenreId();

        album_cache_string = data->getArtistId() + "#"
                             + data->Album().toLower();
        m_albumid[album_cache_string] = data->getAlbumId();

        // read any embedded images from the tag
        MetaIO *tagger = MetaIO::createTagger(filename);

        if (tagger)
        {
            if (tagger->supportsEmbeddedImages())
            {
                AlbumArtList artList = tagger->getAlbumArtList(data->Filename());
                data->setEmbeddedAlbumArt(artList);
                data->getAlbumArtImages()->dumpToDatabase();
            }
            delete tagger;
        }

        delete data;
//.........这里部分代码省略.........

void SearchView::customEvent(QEvent *event)
{
    bool handled = false;

    if (event->type() == MusicPlayerEvent::TrackRemovedEvent ||
        event->type() == MusicPlayerEvent::TrackAddedEvent)
    {
        MusicPlayerEvent *mpe = dynamic_cast<MusicPlayerEvent *>(event);

        if (!mpe)
            return;

        int trackID = mpe->TrackID;

        for (int x = 0; x < m_tracksList->GetCount(); x++)
        {
            MythUIButtonListItem *item = m_tracksList->GetItemAt(x);
            MusicMetadata *mdata = qVariantValue<MusicMetadata*> (item->GetData());
            if (mdata && (mdata->ID() == (MusicMetadata::IdType) trackID || trackID == -1))
            {
                if (gPlayer->getCurrentPlaylist() && gPlayer->getCurrentPlaylist()->checkTrack(mdata->ID()))
                    item->DisplayState("on", "selectedstate");
                else
                    item->DisplayState("off", "selectedstate");
            }
        }

        // call the default handler in MusicCommon so the playlist and UI is updated
        MusicCommon::customEvent(event);
        handled = true;

        if (m_playTrack)
        {
            m_playTrack = false;

            if (event->type() == MusicPlayerEvent::TrackAddedEvent)
            {
                // make the added track current and play it
                m_currentPlaylist->SetItemCurrent(m_currentPlaylist->GetCount() - 1);
                playlistItemClicked(m_currentPlaylist->GetItemCurrent());
            }
        }
    }
    else if (event->type() == MusicPlayerEvent::AllTracksRemovedEvent)
    {
        for (int x = 0; x < m_tracksList->GetCount(); x++)
        {
            MythUIButtonListItem *item = m_tracksList->GetItemAt(x);
            if (item)
                item->DisplayState("off", "selectedstate");
        }
    }
    else if (event->type() == MusicPlayerEvent::MetadataChangedEvent)
    {
        MusicPlayerEvent *mpe = dynamic_cast<MusicPlayerEvent *>(event);

        if (!mpe)
            return;

        uint trackID = mpe->TrackID;

        for (int x = 0; x < m_tracksList->GetCount(); x++)
        {
            MythUIButtonListItem *item = m_tracksList->GetItemAt(x);
            MusicMetadata *mdata = qVariantValue<MusicMetadata*> (item->GetData());
            if (mdata && mdata->ID() == trackID)
            {
                InfoMap metadataMap;
                mdata->toMap(metadataMap);
                item->SetTextFromMap(metadataMap);
            }
        }

//        if (trackID == gPlayer->getCurrentMetadata()->ID())
//            updateTrackInfo(gPlayer->getCurrentMetadata());
    }
    else if (event->type() == DialogCompletionEvent::kEventType)
    {
        DialogCompletionEvent *dce = static_cast<DialogCompletionEvent *>(event);

        // make sure the user didn't ESCAPE out of the menu
        if (dce->GetResult() < 0)
            return;

        QString resultid   = dce->GetId();
        QString resulttext = dce->GetResultText();
        if (resultid == "searchviewmenu")
        {
            if (resulttext == tr("Add To Playlist") || resulttext == tr("Remove From Playlist"))
            {
                if (GetFocusWidget() == m_tracksList)
                {
                    MythUIButtonListItem *item = m_tracksList->GetItemCurrent();
                    if (item)
                    {
                        m_playTrack = false;
                        trackClicked(item);
                    }
                }
            }
//.........这里部分代码省略.........

void SearchView::updateTracksList(void)
{
    m_tracksList->Reset();

    MythUIButtonListItem *item = m_fieldList->GetItemCurrent();

    if (!item)
        return;

    QString searchStr = m_criteriaEdit->GetText();
    int field = item->GetData().toInt();

    QString sql;
    MSqlQuery query(MSqlQuery::InitCon());

    if (searchStr.isEmpty())
    {
        sql = "SELECT song_id "
              "FROM music_songs ";

        query.prepare(sql);
    }
    else
    {
        switch(field)
        {
            case 1: // artist
            {
                sql = "SELECT song_id "
                      "FROM music_songs "
                      "LEFT JOIN music_artists ON "
                      "    music_songs.artist_id=music_artists.artist_id "
                      "WHERE music_artists.artist_name LIKE '%" + searchStr + "%' ";
                query.prepare(sql);
                break;
            }
            case 2: // album
            {
                sql = "SELECT song_id "
                      "FROM music_songs "
                      "LEFT JOIN music_albums ON music_songs.album_id=music_albums.album_id "
                      "WHERE music_albums.album_name LIKE '%" + searchStr + "%' ";
                query.prepare(sql);
                break;
            }
            case 3: // title
            {
                sql = "SELECT song_id "
                      "FROM music_songs "
                      "WHERE music_songs.name LIKE '%" + searchStr + "%' ";
                query.prepare(sql);
                break;
            }
            case 4: // genre
            {
                sql = "SELECT song_id "
                      "FROM music_songs "
                      "LEFT JOIN music_genres ON music_songs.genre_id=music_genres.genre_id "
                      "WHERE music_genres.genre LIKE '%" + searchStr + "%' ";
                query.prepare(sql);
                break;
            }
            case 5: // tags
            {
                //TODO add tag query
            }
            case 0: // all fields
            default:
            {
                sql = "SELECT song_id "
                      "FROM music_songs "
                      "LEFT JOIN music_artists ON "
                      "    music_songs.artist_id=music_artists.artist_id "
                      "LEFT JOIN music_albums ON music_songs.album_id=music_albums.album_id "
                      "LEFT JOIN music_artists AS music_comp_artists ON "
                      "    music_albums.artist_id=music_comp_artists.artist_id "
                      "LEFT JOIN music_genres ON music_songs.genre_id=music_genres.genre_id "
                      "WHERE music_songs.name LIKE '%" + searchStr + "%' "
                      "OR music_artists.artist_name LIKE '%" + searchStr + "%' "
                      "OR music_albums.album_name LIKE '%" + searchStr + "%' "
                      "OR music_genres.genre LIKE '%" + searchStr + "%' ";

                query.prepare(sql);
            }
        }
    }

    if (!query.exec() || !query.isActive())
    {
        MythDB::DBError("Search music database", query);
        return;
    }

    while (query.next())
    {
        int trackid = query.value(0).toInt();

        MusicMetadata *mdata = gMusicData->all_music->getMetadata(trackid);
        if (mdata)
        {
//.........这里部分代码省略.........

//virtual
MusicMetadata *CdDecoder::getMetadata()
{
    QString artist, album, compilation_artist, title, genre;
    int year = 0;
    unsigned long length = 0;
    track_t tracknum = 0;

    if (-1 == m_settracknum)
        tracknum = getFilename().toUInt();
    else
    {
        tracknum = m_settracknum;
        setFilename(QString("%1" CDEXT).arg(tracknum));
    }

    QMutexLocker lock(&getCdioMutex());

    StCdioDevice cdio(m_devicename);
    if (!cdio)
        return NULL;

    const track_t lastTrack = cdio_get_last_track_num(cdio);
    if (CDIO_INVALID_TRACK == lastTrack)
        return NULL;

    if (TRACK_FORMAT_AUDIO != cdio_get_track_format(cdio, tracknum))
        return NULL;

    // Assume disc changed if max LSN different
    bool isDiscChanged = false;
    static lsn_t s_totalSectors;
    lsn_t totalSectors = cdio_get_track_lsn(cdio, CDIO_CDROM_LEADOUT_TRACK);
    if (s_totalSectors != totalSectors)
    {
        s_totalSectors = totalSectors;
        isDiscChanged = true;
    }

    // NB cdio_get_track_last_lsn is unreliable for the last audio track
    // of discs with data tracks beyond
    lsn_t end = cdio_get_track_last_lsn(cdio, tracknum);
    if (isDiscChanged)
    {
        const track_t audioTracks = getNumCDAudioTracks();
        s_lastAudioLsn = cdio_get_track_last_lsn(cdio, audioTracks);

        if (audioTracks < lastTrack)
        {
            cdrom_drive_t *dev = cdio_cddap_identify_cdio(cdio, 0, NULL);
            if (NULL != dev)
            {
                if (DRIVER_OP_SUCCESS == cdio_cddap_open(dev))
                {
                    // NB this can be S L O W  but is reliable
                    lsn_t end2 = cdio_cddap_track_lastsector(dev,
                        getNumCDAudioTracks());
                    if (CDIO_INVALID_LSN != end2)
                        s_lastAudioLsn = end2;
                }
                cdio_cddap_close_no_free_cdio(dev);
            }
        }
    }

    if (s_lastAudioLsn && s_lastAudioLsn < end)
        end = s_lastAudioLsn;

    const lsn_t start = cdio_get_track_lsn(cdio, tracknum);
    if (CDIO_INVALID_LSN != start && CDIO_INVALID_LSN != end)
    {
        length = ((end - start + 1) * 1000 + CDIO_CD_FRAMES_PER_SEC/2) /
            CDIO_CD_FRAMES_PER_SEC;
    }

    bool isCompilation = false;

#define CDTEXT 0 // Disabled - cd-text access on discs without it is S L O W
#if CDTEXT
    static int s_iCdtext;
    if (isDiscChanged)
        s_iCdtext = -1;

    if (s_iCdtext)
    {
        // cdio_get_cdtext can't take >5 seconds on some CD's without cdtext
        if (s_iCdtext < 0)
            LOG(VB_MEDIA, LOG_INFO,
                QString("Getting cdtext for track %1...").arg(tracknum));
        cdtext_t * cdtext = cdio_get_cdtext(m_cdio, tracknum);
        if (NULL != cdtext)
        {
            genre = cdtext_get_const(CDTEXT_GENRE, cdtext);
            artist = cdtext_get_const(CDTEXT_PERFORMER, cdtext);
            title = cdtext_get_const(CDTEXT_TITLE, cdtext);
            const char* isrc = cdtext_get_const(CDTEXT_ISRC, cdtext);
            /* ISRC codes are 12 characters long, in the form CCXXXYYNNNNN
             * CC = country code
             * XXX = registrant e.g. BMG
             * CC = year withou century
//.........这里部分代码省略.........

/*!
 * \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 void handleCDMedia(MythMediaDevice *cd)
{

    if (!cd)
        return;

    LOG(VB_MEDIA, LOG_NOTICE, "Got a media changed event");

    QString newDevice;

    // save the device if valid
    if (cd->isUsable())
    {
#ifdef Q_OS_MAC
        newDevice = cd->getMountPath();
#else
        newDevice = cd->getDevicePath();
#endif

        gCDdevice = newDevice;
        LOG(VB_MEDIA, LOG_INFO, "MythMusic: Storing CD device " + gCDdevice);
    }
    else
    {
        LOG(VB_MEDIA, LOG_INFO, "Device is not usable clearing cd data");

        if (gPlayer->isPlaying() && gPlayer->getCurrentMetadata()
            && gPlayer->getCurrentMetadata()->isCDTrack())
        {
            // we was playing a cd track which is no longer available so stop playback
            // TODO should check the playing track is from the ejected drive if more than one is available
            gPlayer->stop(true);
        }

        // device is not usable so remove any existing CD tracks
        if (gMusicData->all_music)
        {
            gMusicData->all_music->clearCDData();
            gMusicData->all_playlists->getActive()->removeAllCDTracks();
        }

        gPlayer->activePlaylistChanged(-1, false);
        gPlayer->sendCDChangedEvent();

        return;
    }

    if (!gMusicData->initialized)
        gMusicData->loadMusic();

    // remove any existing CD tracks
    if (gMusicData->all_music)
    {
        gMusicData->all_music->clearCDData();
        gMusicData->all_playlists->getActive()->removeAllCDTracks();
    }

    // find any new cd tracks
    CdDecoder *decoder = new CdDecoder("cda", NULL, NULL);
    decoder->setDevice(newDevice);

    int tracks = decoder->getNumTracks();
    bool setTitle = false;

    for (int trackNo = 1; trackNo <= tracks; trackNo++)
    {
        MusicMetadata *track = decoder->getMetadata(trackNo);
        if (track)
        {
            gMusicData->all_music->addCDTrack(*track);

            if (!setTitle)
            {

                QString parenttitle = " ";
                if (track->FormatArtist().length() > 0)
                {
                    parenttitle += track->FormatArtist();
                    parenttitle += " ~ ";
                }

                if (track->Album().length() > 0)
                    parenttitle += track->Album();
                else
                {
                    parenttitle = " " + qApp->translate("(MythMusicMain)", 
                                                        "Unknown");
                    LOG(VB_GENERAL, LOG_INFO, "Couldn't find your "
                    " CD. It may not be in the freedb database.\n"
                    "    More likely, however, is that you need to delete\n"
                    "    ~/.cddb and ~/.cdserverrc and restart MythMusic.");
                }

                gMusicData->all_music->setCDTitle(parenttitle);
                setTitle = true;
            }

            delete track;
        }
    }
//.........这里部分代码省略.........

static int ExtractImage(const MythUtilCommandLineParser &cmdline)
{
    if (cmdline.toString("songid").isEmpty())
    {
        LOG(VB_GENERAL, LOG_ERR, "Missing --songid option");
        return GENERIC_EXIT_INVALID_CMDLINE;
    }

    if (cmdline.toString("imagetype").isEmpty())
    {
        LOG(VB_GENERAL, LOG_ERR, "Missing --imagetype option");
        return GENERIC_EXIT_INVALID_CMDLINE;
    }

    int songID = cmdline.toInt("songid");
    ImageType type = (ImageType)cmdline.toInt("imagetype");

    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;
    }

    AlbumArtImage *image = mdata->getAlbumArtImages()->getImage(type);
    if (!image)
    {
        LOG(VB_GENERAL, LOG_ERR, QString("Cannot find image of type: %1").arg(type));
        return GENERIC_EXIT_NOT_OK;
    }

    MetaIO *tagger = mdata->getTagger();
    if (!tagger)
    {
        LOG(VB_GENERAL, LOG_ERR, QString("Cannot find a tagger for this file: %1").arg(mdata->Filename(false)));
        return GENERIC_EXIT_NOT_OK;
    }


    if (!image->embedded || !tagger->supportsEmbeddedImages())
    {
        LOG(VB_GENERAL, LOG_ERR, QString("Either the image isn't embedded or the tagger doesn't support embedded images"));
        return GENERIC_EXIT_NOT_OK;
    }

    // find the tracks actual filename
    StorageGroup musicGroup("Music", gCoreContext->GetHostName(), false);
    QString trackFilename =  musicGroup.FindFile(mdata->Filename(false));

    // where are we going to save the image
    QString path;
    StorageGroup artGroup("MusicArt", gCoreContext->GetHostName(), false);
    QStringList dirList = artGroup.GetDirList();
    if (dirList.size())
        path = artGroup.FindNextDirMostFree();

    if (!QDir(path).exists())
    {
        LOG(VB_GENERAL, LOG_ERR, "Cannot find a directory in the 'MusicArt' storage group to save to");
        return GENERIC_EXIT_NOT_OK;
    }

    path += "/AlbumArt/";
    QDir dir(path);

    QString filename = QString("%1-%2.jpg").arg(mdata->ID()).arg(AlbumArtImages::getTypeFilename(image->imageType));

    if (QFile::exists(path + filename))
        QFile::remove(path + filename);

    if (!dir.exists())
        dir.mkpath(path);

    QImage *saveImage = tagger->getAlbumArt(trackFilename, image->imageType);
    if (saveImage)
    {
        saveImage->save(path + filename, "JPEG");
        delete saveImage;
    }

    delete tagger;

    // tell any clients that the albumart for this track has changed
    gCoreContext->SendMessage(QString("MUSIC_ALBUMART_CHANGED %1 %2").arg(songID).arg(type));

    return GENERIC_EXIT_OK;
}

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;
}

static int CalcTrackLength(const MythUtilCommandLineParser &cmdline)
{
    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;
    }

    QString musicFile = mdata->getLocalFilename();

    if (musicFile.isEmpty() || !QFile::exists(musicFile))
    {
        LOG(VB_GENERAL, LOG_ERR, QString("Cannot find file for trackid: %1").arg(songID));
        return GENERIC_EXIT_NOT_OK;
    }

    av_register_all();

    AVFormatContext *inputFC = NULL;
    AVInputFormat *fmt = NULL;

    // Open track
    LOG(VB_GENERAL, LOG_DEBUG, QString("CalcTrackLength: Opening '%1'")
            .arg(musicFile));

    QByteArray inFileBA = musicFile.toLocal8Bit();

    int ret = avformat_open_input(&inputFC, inFileBA.constData(), fmt, NULL);

    if (ret)
    {
        LOG(VB_GENERAL, LOG_ERR, "CalcTrackLength: Couldn't open input file" +
                                  ENO);
        return GENERIC_EXIT_NOT_OK;
    }

    // Getting stream information
    ret = avformat_find_stream_info(inputFC, NULL);

    if (ret < 0)
    {
        LOG(VB_GENERAL, LOG_ERR,
            QString("CalcTrackLength: Couldn't get stream info, error #%1").arg(ret));
        avformat_close_input(&inputFC);
        inputFC = NULL;
        return GENERIC_EXIT_NOT_OK;;
    }

    int duration = 0;
    long long time = 0;

    for (uint i = 0; i < inputFC->nb_streams; i++)
    {
        AVStream *st = inputFC->streams[i];
        char buf[256];

        avcodec_string(buf, sizeof(buf), st->codec, false);

        switch (inputFC->streams[i]->codec->codec_type)
        {
            case AVMEDIA_TYPE_AUDIO:
            {
                AVPacket pkt;
                av_init_packet(&pkt);

                while (av_read_frame(inputFC, &pkt) >= 0)
                {
                    if (pkt.stream_index == (int)i)
                        time = time + pkt.duration;

                    av_free_packet(&pkt);
                }

                duration = time * av_q2d(inputFC->streams[i]->time_base);
                break;
            }

            default:
                LOG(VB_GENERAL, LOG_ERR,
                    QString("Skipping unsupported codec %1 on stream %2")
                        .arg(inputFC->streams[i]->codec->codec_type).arg(i));
                break;
        }
    }

    // Close input file
    avformat_close_input(&inputFC);
    inputFC = NULL;

    if (mdata->Length() / 1000 != duration)
    {
//.........这里部分代码省略.........

void Playlist::shuffleTracks(MusicPlayer::ShuffleMode shuffleMode)
{
    m_shuffledSongs.clear();

    switch (shuffleMode)
    {
        case MusicPlayer::SHUFFLE_RANDOM:
        {
            QMultiMap<int, MusicMetadata*> songMap;

            SongList::const_iterator it = m_songs.begin();
            for (; it != m_songs.end(); ++it)
            {
                songMap.insert(rand(), *it);
            }

            QMultiMap<int, MusicMetadata*>::const_iterator i = songMap.constBegin();
            while (i != songMap.constEnd())
            {
                m_shuffledSongs.append(i.value());
                ++i;
            }

            break;
        }

        case MusicPlayer::SHUFFLE_INTELLIGENT:
        {
            int RatingWeight = 2;
            int PlayCountWeight = 2;
            int LastPlayWeight = 2;
            int RandomWeight = 2;
            m_parent->FillIntelliWeights(RatingWeight, PlayCountWeight,
                                         LastPlayWeight, RandomWeight);

            // compute max/min playcount,lastplay for this playlist
            int playcountMin = 0;
            int playcountMax = 0;
            double lastplayMin = 0.0;
            double lastplayMax = 0.0;

            uint idx = 0;
            SongList::const_iterator it = m_songs.begin();
            for (; it != m_songs.end(); ++it, ++idx)
            {
                if (!(*it)->isCDTrack())
                {
                    MusicMetadata *mdata = (*it);

                    if (0 == idx)
                    {
                        // first song
                        playcountMin = playcountMax = mdata->PlayCount();
                        lastplayMin = lastplayMax = mdata->LastPlay().toTime_t();
                    }
                    else
                    {
                        if (mdata->PlayCount() < playcountMin)
                            playcountMin = mdata->PlayCount();
                        else if (mdata->PlayCount() > playcountMax)
                            playcountMax = mdata->PlayCount();

                        if (mdata->LastPlay().toTime_t() < lastplayMin)
                            lastplayMin = mdata->LastPlay().toTime_t();
                        else if (mdata->LastPlay().toTime_t() > lastplayMax)
                            lastplayMax = mdata->LastPlay().toTime_t();
                    }
                }
            }

            // next we compute all the weights
            std::map<int,double> weights;
            std::map<int,int> ratings;
            std::map<int,int> ratingCounts;
            int TotalWeight = RatingWeight + PlayCountWeight + LastPlayWeight;
            for (int trackItI = 0; trackItI < m_songs.size(); ++trackItI)
            {
                MusicMetadata *mdata = m_songs[trackItI];
                if (!mdata->isCDTrack())
                {
                    int rating = mdata->Rating();
                    int playcount = mdata->PlayCount();
                    double lastplaydbl = mdata->LastPlay().toTime_t();
                    double ratingValue = (double)(rating) / 10;
                    double playcountValue, lastplayValue;

                    if (playcountMax == playcountMin)
                        playcountValue = 0;
                    else
                        playcountValue = ((playcountMin - (double)playcount) / (playcountMax - playcountMin) + 1);

                    if (lastplayMax == lastplayMin)
                        lastplayValue = 0;
                    else
                        lastplayValue = ((lastplayMin - lastplaydbl) / (lastplayMax - lastplayMin) + 1);

                    double weight = (RatingWeight * ratingValue +
                                        PlayCountWeight * playcountValue +
                                        LastPlayWeight * lastplayValue) / TotalWeight;
                    weights[mdata->ID()] = weight;
//.........这里部分代码省略.........

int Playlist::CreateCDMP3(void)
{
    // Check & get global settings
    if (!gCoreContext->GetNumSetting("CDWriterEnabled"))
    {
        LOG(VB_GENERAL, LOG_ERR, "CD Writer is not enabled.");
        return 1;
    }

    QString scsidev = MediaMonitor::defaultCDWriter();
    if (scsidev.isEmpty())
    {
        LOG(VB_GENERAL, LOG_ERR, "No CD Writer device defined.");
        return 1;
    }

    int disksize = gCoreContext->GetNumSetting("CDDiskSize", 2);
    QString writespeed = gCoreContext->GetSetting("CDWriteSpeed", "2");
    bool MP3_dir_flag = gCoreContext->GetNumSetting("CDCreateDir", 1);

    double size_in_MB = 0.0;

    QStringList reclist;

    SongList::const_iterator it = m_songs.begin();
    for (; it != m_songs.end(); ++it)
    {
        if ((*it)->isCDTrack())
            continue;

        // Normal track
        MusicMetadata *tmpdata = (*it);
        if (tmpdata)
        {
            // check filename..
            QFileInfo testit(tmpdata->Filename());
            if (!testit.exists())
                continue;
            size_in_MB += testit.size() / 1000000.0;
            QString outline;
            if (MP3_dir_flag)
            {
                if (tmpdata->Artist().length() > 0)
                    outline += tmpdata->Artist() + "/";
                if (tmpdata->Album().length() > 0)
                    outline += tmpdata->Album() + "/";
            }

            outline += "=";
            outline += tmpdata->Filename();

            reclist += outline;
        }
    }

    int max_size;
    if (disksize == 0)
        max_size = 650;
    else
        max_size = 700;

    if (size_in_MB >= max_size)
    {
        LOG(VB_GENERAL, LOG_ERR, "MP3 CD creation aborted -- cd size too big.");
        return 1;
    }

    // probably should tie stdout of mkisofs to stdin of cdrecord sometime
    QString tmptemplate("/tmp/mythmusicXXXXXX");

    QString tmprecordlist = createTempFile(tmptemplate);
    if (tmprecordlist == tmptemplate)
    {
        LOG(VB_GENERAL, LOG_ERR, "Unable to open temporary file");
        return 1;
    }

    QString tmprecordisofs = createTempFile(tmptemplate);
    if (tmprecordisofs == tmptemplate)
    {
        LOG(VB_GENERAL, LOG_ERR, "Unable to open temporary file");
        return 1;
    }

    QFile reclistfile(tmprecordlist);

    if (!reclistfile.open(QIODevice::WriteOnly))
    {
        LOG(VB_GENERAL, LOG_ERR, "Unable to open temporary file");
        return 1;
    }

    QTextStream recstream(&reclistfile);

    QStringList::Iterator iter;

    for (iter = reclist.begin(); iter != reclist.end(); ++iter)
    {
        recstream << *iter << "\n";
    }
//.........这里部分代码省略.........