bool MP3::readID3v2(const std::string& filename, Metadata& meta) {
// After reading http://mail.kde.org/pipermail/taglib-devel/2008-March/000902.html
// adding a big lock seems reasonable
try {
taglib_mutex.lock();
TagLib::MPEG::File f(filename.c_str());
if (f.isValid() && f.tag()) {
TagLib::Tag* pTag = f.tag();
meta.interpret = pTag->artist().isNull() ? "" : pTag->artist().to8Bit(true);
meta.album = pTag->album().isNull() ? "" : pTag->album().to8Bit(true);
meta.title = pTag->title().isNull() ? "" : pTag->title().to8Bit(true);
meta.genre = pTag->genre().isNull() ? "" : pTag->genre().to8Bit(true);
meta.track_no = pTag->track();
meta.year = pTag->year();
taglib_mutex.unlock();
return meta.complete();
}
} catch (const std::exception&) {
taglib_mutex.unlock();
// ...
}
return false;
}
Metadata MP3::getMetadata(const std::string& filename) {
Metadata meta;
meta.filename = filename;
Service::LastFmClient client(options);
// read from id3v2
if (readID3v2(filename, meta) && meta.complete() && !options->hasOption("force-fingerprint")) {
return meta;
}
std::map<std::string, std::string> params;
int duration, srate, bitrate, nchannels;
const size_t pcmBufSize = 131072;
short *pPCMBuffer = new short[pcmBufSize];
MP3_Source mp3;
mp3.getInfo(filename, duration, srate, bitrate, nchannels);
mp3.init(filename);
mp3.skipSilence();
try {
fpe_mutex.lock(); // due to fftwf_plan_*
fingerprint::FingerprintExtractor fextr;
fpe_mutex.unlock();
fextr.initForQuery(srate, nchannels, duration);
mp3.skip(static_cast<int>(fextr.getToSkipMs()));
fextr.process(0, static_cast<size_t>(srate * nchannels * (fextr.getToSkipMs() / 1000.0)));
while(true) {
size_t r = mp3.updateBuffer(pPCMBuffer, pcmBufSize);
if (!r) {
std::cerr << "no input data" << std::endl;
}
if (fextr.process(pPCMBuffer, r, mp3.eof())) {
break;
}
}
params["username"] = "******";
params["duration"] = boost::lexical_cast<std::string>(duration);
params["samplerate"] = boost::lexical_cast<std::string>(srate);
pair<const char*, size_t> fpData = fextr.getFingerprint();
int fpid = client.getFingerprint(fpData, params);
client.getMetadata(fpid, &meta);
} catch(const std::exception &e) {
std::cerr << "Exception: " << e.what() << std::endl;
return meta;
}
return meta;
}
