Add support for TagParser as an alternative to TagLib

ext/libstrawberry-tagreader/tagreaderbase.h

@@ -0,0 +1,51 @@
+/* This file is part of Strawberry.
+   Copyright 2018-2021, Jonas Kvinge <jonas@jkvinge.net>
+
+   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 TAGREADERBASE_H
+#define TAGREADERBASE_H
+
+#include "config.h"
+
+#include <string>
+
+#include <QByteArray>
+#include <QString>
+
+#include "tagreadermessages.pb.h"
+
+/*
+ * This class holds all useful methods to read and write tags from/to files.
+ * You should not use it directly in the main process but rather use a TagReaderWorker process (using TagReaderClient)
+ */
+class TagReaderBase {
+ public:
+  explicit TagReaderBase();
+  ~TagReaderBase();
+
+  virtual bool IsMediaFile(const QString &filename) const = 0;
+
+  virtual void ReadFile(const QString &filename, spb::tagreader::SongMetadata *song) const = 0;
+  virtual bool SaveFile(const QString &filename, const spb::tagreader::SongMetadata &song) const = 0;
+
+  virtual QByteArray LoadEmbeddedArt(const QString &filename) const = 0;
+  virtual bool SaveEmbeddedArt(const QString &filename, const QByteArray &data) = 0;
+
+ protected:
+  static const std::string kEmbeddedCover;
+};
+
+#endif  // TAGREADERBASE_H