strawberry-audio-player-win.../src/engine/chromaprinter.h

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/*
* Strawberry Music Player
* This file was part of Clementine.
* Copyright 2012, David Sansome <me@davidsansome.com>
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* Copyright 2019-2021, Jonas Kvinge <jonas@jkvinge.net>
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*
* Strawberry 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.
*
* Strawberry 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 Strawberry. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
#ifndef CHROMAPRINTER_H
#define CHROMAPRINTER_H
#include "config.h"
#include <glib.h>
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#include <gst/gst.h>
#include <gst/app/gstappsink.h>
#include <QBuffer>
#include <QString>
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.
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// You should create one Chromaprinter for each file you want to fingerprint.
// This class works well with QtConcurrentMap.
public:
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explicit Chromaprinter(const QString &filename);
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// 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.
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QString CreateFingerprint();
private:
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static GstElement *CreateElement(const QString &factory_name, GstElement *bin = nullptr);
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static void NewPadCallback(GstElement*, GstPad *pad, gpointer data);
static GstFlowReturn NewBufferCallback(GstAppSink *app_sink, gpointer self);
private:
QString filename_;
GstElement *convert_element_;
QBuffer buffer_;
};
#endif // CHROMAPRINTER_H