Add moodbar

src/moodbar/moodbarpipeline.h

@@ -0,0 +1,79 @@
+/* This file was part of Clementine.
+   Copyright 2012, David Sansome <me@davidsansome.com>
+
+   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/>.
+*/
+
+#ifndef MOODBARPIPELINE_H
+#define MOODBARPIPELINE_H
+
+#include <QObject>
+#include <QByteArray>
+#include <QString>
+#include <QUrl>
+
+#include <gst/gst.h>
+#include <gst/app/gstappsink.h>
+
+#include <memory>
+
+class MoodbarBuilder;
+
+// Creates moodbar data for a single local music file.
+class MoodbarPipeline : public QObject {
+  Q_OBJECT
+
+ public:
+  MoodbarPipeline(const QUrl& local_filename);
+  ~MoodbarPipeline();
+
+  static bool IsAvailable();
+
+  bool success() const { return success_; }
+  const QByteArray& data() const { return data_; }
+
+ public slots:
+  void Start();
+
+ signals:
+  void Finished(bool success);
+
+ private:
+  GstElement* CreateElement(const QString& factory_name);
+
+  void ReportError(GstMessage* message);
+  void Stop(bool success);
+  void Cleanup();
+
+  static void NewPadCallback(GstElement*, GstPad* pad, gpointer data);
+  static GstFlowReturn NewBufferCallback(GstAppSink* app_sink, gpointer self);
+  static gboolean BusCallback(GstBus*, GstMessage* msg, gpointer data);
+  static GstBusSyncReply BusCallbackSync(GstBus*, GstMessage* msg, gpointer data);
+
+ private:
+  static bool sIsAvailable;
+  static const int kBands;
+
+  QUrl local_filename_;
+  GstElement* pipeline_;
+  GstElement* convert_element_;
+
+  std::unique_ptr<MoodbarBuilder> builder_;
+
+  bool success_;
+  bool running_;
+  QByteArray data_;
+};
+
+#endif  // MOODBARPIPELINE_H