Implement memchecker to ensure a drumkit fits into RAM.

It's a class that can calculate the available free RAM (or rather a rough
estimation of it) and the size of the drumkit when loaded into RAM
and provides a plugic method to check if the drumkit then fits into RAM.

1 files changed, 48 insertions, 0 deletions

diff --git a/src/memchecker.h b/src/memchecker.h
new file mode 100644
index 0000000..c3e13c2
--- /dev/null
+++ b/src/memchecker.h
@@ -0,0 +1,48 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/***************************************************************************
+ *            memchecker.h
+ *
+ *  Sat Jan 16 18:27:52 CET 2016
+ *  Copyright 2016 André Nusser
+ *  andre.nusser@googlemail.com
+ ****************************************************************************/
+
+/*
+ *  This file is part of DrumGizmo.
+ *
+ *  DrumGizmo 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 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  DrumGizmo 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 DrumGizmo; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
+ */
+#pragma once
+
+#include "drumkit.h"
+
+#include <string>
+
+class Memchecker
+{
+public:
+	 //! Checks if there is enough memory left to load drumkit into RAM.
+	 //! \param drumkit The drumkit for which it is checked if there's enough memory left.
+	 //! \return True iff there is enough memory left.
+	bool enoughFreeMemory(const DrumKit& drumkit) const;
+
+protected:
+	// Computes how much RAM (in bytes) is left.
+	size_t calcFreeMemory() const;
+	// Computes how much memory the drumkit takes when loaded into RAM (in bytes).
+	size_t calcNeededMemory(const DrumKit& drumkit) const;
+	// Computes the number of bytes per channel of <filename> using libsnd.
+	size_t calcBytesPerChannel(const std::string& filename) const;
+};