C++ File::isValid方法代码示例

/**
 * Open a file via taglib and add file type information
 *
 * Open files, that taglib supports but taggit doesn't have specific support
 * for using TagLibs generic interface only. That will stop us from working
 * with multi-artist files for those types, but it's better than nothing.
 *
 * @param   file    file name to open
 *
 * @return      copy of the generated struct taggit_file; *NOT* a pointer
 *              to it! Destroy using taggit_file_destroy().
 * @sideeffects none
 */
struct taggit_file
taggit_file_open(const char *file)
{
    struct taggit_file rc;
    char *ext;

    ext = (char *)strrchr(file, (int)'.');
    if (ext == NULL || *(ext + 1) == '\0')
        goto err;

    ext++;
    if (strcaseeq(ext, (char *)"mp3")) {
        rc.data = reinterpret_cast<TagLib_File *>
            (new TagLib::MPEG::File(file));
        rc.type = FT_MPEG;
    } else if (strcaseeq(ext, (char *)"ogg")) {
        rc.data = reinterpret_cast<TagLib_File *>
            (new TagLib::Ogg::Vorbis::File(file));
        rc.type = FT_OGGVORBIS;
    } else if (strcaseeq(ext, (char *)"oga")) {
        TagLib::File *f;

        f = new TagLib::Ogg::FLAC::File(file);
        if (f->isValid()) {
            rc.data = reinterpret_cast<TagLib_File *>(f);
            rc.type = FT_OGGFLAC;
        } else {
            delete f;
            rc.data = reinterpret_cast<TagLib_File *>
                (new TagLib::Ogg::Vorbis::File(file));
            rc.type = FT_OGGVORBIS;
        }
    } else if (strcaseeq(ext, (char *)"flac")) {
        rc.data = reinterpret_cast<TagLib_File *>
            (new TagLib::FLAC::File(file));
        rc.type = FT_FLAC;
    } else {
        TagLib_File *f;

        f = taglib_file_new(file);
        if (!taglib_file_is_valid(f)) {
            taglib_file_free(f);
            goto err;
        } else {
            rc.data = f;
            rc.type = FT_UNKNOWN;
        }
    }

    return rc;

err:
    fprintf(stderr, "Cannot handle file: \"%s\" - skipping.\n", file);
    rc.data = NULL;
    rc.type = FT_INVALID;
    return rc;
}

bool CTagLoaderTagLib::Load(const std::string& strFileName, CMusicInfoTag& tag, const std::string& fallbackFileExtension, MUSIC_INFO::EmbeddedArt *art /* = NULL */)
{
  std::string strExtension = URIUtils::GetExtension(strFileName);
  StringUtils::TrimLeft(strExtension, ".");

  if (strExtension.empty())
  {
    strExtension = fallbackFileExtension;
    if (strExtension.empty())
      return false;
  }

  StringUtils::ToLower(strExtension);
  TagLibVFSStream*           stream = new TagLibVFSStream(strFileName, true);
  if (!stream)
  {
    CLog::Log(LOGERROR, "could not create TagLib VFS stream for: %s", strFileName.c_str());
    return false;
  }

  ID3v1::Tag::setStringHandler(&ID3v1StringHandler);
  ID3v2::Tag::setLatin1StringHandler(&ID3v2StringHandler);
  TagLib::File*              file = NULL;
  TagLib::APE::File*         apeFile = NULL;
  TagLib::ASF::File*         asfFile = NULL;
  TagLib::FLAC::File*        flacFile = NULL;
  TagLib::IT::File*          itFile = NULL;
  TagLib::Mod::File*         modFile = NULL;
  TagLib::MP4::File*         mp4File = NULL;
  TagLib::MPC::File*         mpcFile = NULL;
  TagLib::MPEG::File*        mpegFile = NULL;
  TagLib::Ogg::Vorbis::File* oggVorbisFile = NULL;
  TagLib::Ogg::FLAC::File*   oggFlacFile = NULL;
  TagLib::S3M::File*         s3mFile = NULL;
  TagLib::TrueAudio::File*   ttaFile = NULL;
  TagLib::WavPack::File*     wvFile = NULL;
  TagLib::XM::File*          xmFile = NULL;
  TagLib::RIFF::WAV::File *  wavFile = NULL;
  TagLib::RIFF::AIFF::File * aiffFile = NULL;

  if (strExtension == "ape")
    file = apeFile = new APE::File(stream);
  else if (strExtension == "asf" || strExtension == "wmv" || strExtension == "wma")
    file = asfFile = new ASF::File(stream);
  else if (strExtension == "flac")
    file = flacFile = new FLAC::File(stream, ID3v2::FrameFactory::instance());
  else if (strExtension == "it")
    file = itFile = new IT::File(stream);
  else if (strExtension == "mod" || strExtension == "module" || strExtension == "nst" || strExtension == "wow")
    file = modFile = new Mod::File(stream);
  else if (strExtension == "mp4" || strExtension == "m4a" ||
           strExtension == "m4r" || strExtension == "m4b" ||
           strExtension == "m4p" || strExtension == "3g2")
    file = mp4File = new MP4::File(stream);
  else if (strExtension == "mpc")
    file = mpcFile = new MPC::File(stream);
  else if (strExtension == "mp3" || strExtension == "aac")
    file = mpegFile = new MPEG::File(stream, ID3v2::FrameFactory::instance());
  else if (strExtension == "s3m")
    file = s3mFile = new S3M::File(stream);
  else if (strExtension == "tta")
    file = ttaFile = new TrueAudio::File(stream, ID3v2::FrameFactory::instance());
  else if (strExtension == "wv")
    file = wvFile = new WavPack::File(stream);
  else if (strExtension == "aif" || strExtension == "aiff")
    file = aiffFile = new RIFF::AIFF::File(stream);
  else if (strExtension == "wav")
    file = wavFile = new RIFF::WAV::File(stream);
  else if (strExtension == "xm")
    file = xmFile = new XM::File(stream);
  else if (strExtension == "ogg")
    file = oggVorbisFile = new Ogg::Vorbis::File(stream);
  else if (strExtension == "oga") // Leave this madness until last - oga container can have Vorbis or FLAC
  {
    file = oggFlacFile = new Ogg::FLAC::File(stream);
    if (!file || !file->isValid())
    {
      delete file;
      oggFlacFile = NULL;
      file = oggVorbisFile = new Ogg::Vorbis::File(stream);
    }
  }

  if (!file || !file->isOpen())
  {
    delete file;
    delete stream;
    CLog::Log(LOGDEBUG, "file could not be opened for tag reading");
    return false;
  }

  APE::Tag *ape = NULL;
  ASF::Tag *asf = NULL;
  MP4::Tag *mp4 = NULL;
  ID3v1::Tag *id3v1 = NULL;
  ID3v2::Tag *id3v2 = NULL;
  Ogg::XiphComment *xiph = NULL;
  Tag *generic = NULL;

  if (apeFile)
//.........这里部分代码省略.........

bool SoundSource::processTaglibFile(TagLib::File& f) {
    if (s_bDebugMetadata)
        qDebug() << "Parsing" << getFilename();

    if (f.isValid()) {
        TagLib::Tag *tag = f.tag();
        if (tag) {
            QString title = TStringToQString(tag->title());
            setTitle(title);

            QString artist = TStringToQString(tag->artist());
            setArtist(artist);

            QString album = TStringToQString(tag->album());
            setAlbum(album);

            QString comment = TStringToQString(tag->comment());
            setComment(comment);

            QString genre = TStringToQString(tag->genre());
            setGenre(genre);

            int iYear = tag->year();
            QString year = "";
            if (iYear > 0) {
                year = QString("%1").arg(iYear);
                setYear(year);
            }

            int iTrack = tag->track();
            QString trackNumber = "";
            if (iTrack > 0) {
                trackNumber = QString("%1").arg(iTrack);
                setTrackNumber(trackNumber);
            }

            if (s_bDebugMetadata)
                qDebug() << "TagLib" << "title" << title << "artist" << artist << "album" << album << "comment" << comment << "genre" << genre << "year" << year << "trackNumber" << trackNumber;
        }

        TagLib::AudioProperties *properties = f.audioProperties();
        if (properties) {
            int lengthSeconds = properties->length();
            int bitrate = properties->bitrate();
            int sampleRate = properties->sampleRate();
            int channels = properties->channels();

            if (s_bDebugMetadata)
                qDebug() << "TagLib" << "length" << lengthSeconds << "bitrate" << bitrate << "sampleRate" << sampleRate << "channels" << channels;

            setDuration(lengthSeconds);
            setBitrate(bitrate);
            setSampleRate(sampleRate);
            setChannels(channels);
        }

        // If we didn't get any audio properties, this was a failure.
        return (properties!=NULL);
    }
    return false;
}

TagLib::File *Meta::Tag::FileTypeResolver::createFile(TagLib::FileName fileName,
        bool readProperties,
        TagLib::AudioProperties::ReadStyle propertiesStyle) const
{
    TagLib::File* result = 0;

    QString fn = QFile::decodeName(fileName);
    QString suffix = QFileInfo(fn).suffix();

    #ifdef ENABLE_KDE_SUPPORT
    KMimeType::Ptr mimetype = KMimeType::findByPath(fn);

    // -- check by mime type
    if (mimetype->is(QLatin1String("audio/mpeg")) || mimetype->is(QLatin1String("audio/x-mpegurl"))
            || mimetype->is(QLatin1String("audio/mpeg"))) {
        result = new TagLib::MPEG::File(fileName, readProperties, propertiesStyle);
    } else if (mimetype->is(QLatin1String("audio/mp4")) || mimetype->is(QLatin1String("video/mp4"))) {
        result = new TagLib::MP4::File(fileName, readProperties, propertiesStyle);
    } else if (mimetype->is(QLatin1String("audio/x-ms-wma")) /*|| mimetype->is(QLatin1String("video/x-ms-asf"))
            || mimetype->is(QLatin1String("video/x-msvideo")) || mimetype->is(QLatin1String("video/x-ms-wmv"))*/) {
        result = new TagLib::ASF::File(fileName, readProperties, propertiesStyle);
    }
    #ifdef TAGLIB_EXTRAS_FOUND
    else if (mimetype->is(QLatin1String("audio/vnd.rn-realaudio")) || mimetype->is(QLatin1String("audio/x-pn-realaudioplugin"))
            /*|| mimetype->is(QLatin1String("audio/vnd.rn-realvideo"))*/) {
        result = new TagLibExtras::RealMedia::File(fileName, readProperties, propertiesStyle);
    }
    #endif
    #ifdef TAGLIB_OPUS_FOUND
    else if (mimetype->is(QLatin1String("audio/opus")) || mimetype->is(QLatin1String("audio/x-opus+ogg"))) {
        result = new TagLib::Ogg::Opus::File(fileName, readProperties, propertiesStyle);
    }
    #endif
    else if (mimetype->is(QLatin1String("audio/x-vorbis+ogg"))) {
        result = new TagLib::Ogg::Vorbis::File(fileName, readProperties, propertiesStyle);
    } else if (mimetype->is(QLatin1String("audio/x-flac+ogg"))) {
        result = new TagLib::Ogg::FLAC::File(fileName, readProperties, propertiesStyle);
    } else if (mimetype->is(QLatin1String("audio/x-aiff"))) {
        result = new TagLib::RIFF::AIFF::File(fileName, readProperties, propertiesStyle);
    } else if (mimetype->is(QLatin1String("audio/x-flac"))) {
        result = new TagLib::FLAC::File(fileName, readProperties, propertiesStyle);
    } else if (mimetype->is(QLatin1String("audio/x-musepack"))) {
        result = new TagLib::MPC::File(fileName, readProperties, propertiesStyle);
    } else if (mimetype->is(QLatin1String("audio/x-wav"))) {
        result = new TagLib::RIFF::WAV::File(fileName, readProperties, propertiesStyle);
    } else if (mimetype->is(QLatin1String("audio/x-wavpack"))) {
        result = new TagLib::WavPack::File(fileName, readProperties, propertiesStyle);
    } else if (mimetype->is(QLatin1String("audio/x-tta"))) {
        result = new TagLib::TrueAudio::File(fileName, readProperties, propertiesStyle);
    } else if (mimetype->is(QLatin1String("audio/x-speex")) || mimetype->is(QLatin1String("audio/x-speex+ogg"))) {
        result = new TagLib::TrueAudio::File(fileName, readProperties, propertiesStyle);
    } else if (mimetype->is(QLatin1String("audio/x-speex")) || mimetype->is(QLatin1String("audio/x-speex+ogg"))) {
        result = new TagLib::TrueAudio::File(fileName, readProperties, propertiesStyle);
    } else if (mimetype->is(QLatin1String("audio/x-ape"))) {
        result = new TagLib::APE::File(fileName, readProperties, propertiesStyle);
    }

    // -- check by extension
    #else // ENABLE_KDE_SUPPORT
    if (suffix == QLatin1String("mp3")) {
        result = new TagLib::MPEG::File(fileName, readProperties, propertiesStyle);
    } else if (suffix == QLatin1String("flac")) {
        result = new TagLib::FLAC::File(fileName, readProperties, propertiesStyle);
    } else if (suffix == QLatin1String("ogg")) {
        result = new TagLib::Ogg::Vorbis::File(fileName, readProperties, propertiesStyle);
        if (!result->isValid()) {
            delete result;
            result = new TagLib::Ogg::FLAC::File(fileName, readProperties, propertiesStyle);
        }
        if (!result->isValid()) {
            delete result;
            result = new TagLib::TrueAudio::File(fileName, readProperties, propertiesStyle);
        }
        #ifdef TAGLIB_OPUS_FOUND
        if (!result->isValid()) {
            delete result;
            result = new TagLib::Ogg::Opus::File(fileName, readProperties, propertiesStyle);
        }
        #endif
    }
    #endif //
    else if (suffix == QLatin1String("m4a") || suffix == QLatin1String("m4b")
        || suffix == QLatin1String("m4p") || suffix == QLatin1String("mp4")
        /*|| suffix == QLatin1String("m4v") || suffix == QLatin1String("mp4v") */) {
        result = new TagLib::MP4::File(fileName, readProperties, propertiesStyle);
    } else if (suffix == QLatin1String("wav")) {
        result = new TagLib::RIFF::WAV::File(fileName, readProperties, propertiesStyle);
    } else if (suffix == QLatin1String("wma") /*|| suffix == QLatin1String("asf")*/) {
        result = new TagLib::ASF::File(fileName, readProperties, propertiesStyle);
    } else if (suffix == QLatin1String("wvp") || suffix == QLatin1String("wv")) {
        result = new TagLib::WavPack::File(fileName, readProperties, propertiesStyle);
    } else if (suffix == QLatin1String("ape")) {
        result = new TagLib::APE::File(fileName, readProperties, propertiesStyle);
    } else if (suffix == QLatin1String("spx")) {
        result = new TagLib::TrueAudio::File(fileName, readProperties, propertiesStyle);
    } else if (suffix == QLatin1String("tta")) {
        result = new TagLib::TrueAudio::File(fileName, readProperties, propertiesStyle);
    } else if (suffix == QLatin1String("aiff") || suffix == QLatin1String("aif") || suffix == QLatin1String("aifc")) {
        result = new TagLib::RIFF::AIFF::File(fileName, readProperties, propertiesStyle);
    } else if (suffix == QLatin1String("mpc") || suffix == QLatin1String("mpp") || suffix == QLatin1String("mp+")) {
//.........这里部分代码省略.........

bool KFlacPlugin::readInfo( KFileMetaInfo& info, uint what )
{
    if ( info.path().isEmpty() ) // remote file
        return false;

    bool readComment = false;
    bool readTech = false;
    if (what & (KFileMetaInfo::Fastest |
                KFileMetaInfo::DontCare |
                KFileMetaInfo::ContentInfo)) readComment = true;

    if (what & (KFileMetaInfo::Fastest |
                KFileMetaInfo::DontCare |
                KFileMetaInfo::TechnicalInfo)) readTech = true;

    TagLib::File *file = 0;

    if (info.mimeType() == "audio/x-flac")
        file = new TagLib::FLAC::File(QFile::encodeName(info.path()).data(), readTech);
#ifdef TAGLIB_1_2
    else
        file = new TagLib::Ogg::FLAC::File(QFile::encodeName(info.path()).data(), readTech);
#endif

    if (!file || !file->isValid())
    {
        kdDebug(7034) << "Couldn't open " << file->name() << endl;
        delete file;
        return false;
    }

    if(readComment && file->tag())
    {
        KFileMetaInfoGroup commentgroup = appendGroup(info, "Comment");

        QString date  = file->tag()->year() > 0 ? QString::number(file->tag()->year()) : QString::null;
        QString track = file->tag()->track() > 0 ? QString::number(file->tag()->track()) : QString::null;

        appendItem(commentgroup, "Title",       TStringToQString(file->tag()->title()).stripWhiteSpace());
        appendItem(commentgroup, "Artist",      TStringToQString(file->tag()->artist()).stripWhiteSpace());
        appendItem(commentgroup, "Album",       TStringToQString(file->tag()->album()).stripWhiteSpace());
        appendItem(commentgroup, "Date",        date);
        appendItem(commentgroup, "Comment",     TStringToQString(file->tag()->comment()).stripWhiteSpace());
        appendItem(commentgroup, "Tracknumber", track);
        appendItem(commentgroup, "Genre",       TStringToQString(file->tag()->genre()).stripWhiteSpace());
    }

    if (readTech && file->audioProperties())
    {
        KFileMetaInfoGroup techgroup = appendGroup(info, "Technical");
        TagLib::FLAC::Properties *properties =
                   (TagLib::FLAC::Properties*)(file->audioProperties());

        appendItem(techgroup, "Bitrate",      properties->bitrate());
        appendItem(techgroup, "Sample Rate",  properties->sampleRate());
        appendItem(techgroup, "Sample Width", properties->sampleWidth());
        appendItem(techgroup, "Channels",     properties->channels());
        appendItem(techgroup, "Length",       properties->length());
    }

    delete file;
    return true;

}