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