Clementine-audio-player-Mac.../src/musicbrainz/chromaprinter.h

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/* This file is part of Clementine.
Copyright 2012, David Sansome <me@davidsansome.com>
Clementine is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Clementine is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Clementine. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef CHROMAPRINTER_H
#define CHROMAPRINTER_H
#include <glib.h>
#include <gst/gst.h>
#include <gst/app/gstappsink.h>
#include <QBuffer>
#include <QString>
class QEventLoop;
class Chromaprinter {
// Creates a Chromaprint fingerprint from a song.
// Uses GStreamer to open and decode the file as PCM data and passes this
// to Chromaprint's code generator. The generated code can be used to identify
// a song via Acoustid.
// You should create one Chromaprinter for each file you want to fingerprint.
// This class works well with QtConcurrentMap.
public:
Chromaprinter(const QString& filename);
~Chromaprinter();
// Creates a fingerprint from the song. This method is blocking, so you want
// to call it in another thread. Returns an empty string if no fingerprint
// could be created.
QString CreateFingerprint();
private:
GstElement* CreateElement(const QString& factory_name,
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GstElement* bin = nullptr);
void ReportError(GstMessage* message);
static void NewPadCallback(GstElement*, GstPad* pad, gboolean, gpointer data);
static gboolean BusCallback(GstBus*, GstMessage* msg, gpointer data);
static GstBusSyncReply BusCallbackSync(GstBus*, GstMessage* msg,
gpointer data);
static GstFlowReturn NewBufferCallback(GstAppSink* app_sink, gpointer self);
private:
QString filename_;
GMainLoop* event_loop_;
GstElement* convert_element_;
GstElement* pipeline_;
QBuffer buffer_;
bool finishing_;
};
#endif // CHROMAPRINTER_H