add missing file

git-svn-id: svn://localhost/ardour2/trunk@2540 d708f5d6-7413-0410-9779-e7cbd77b26cf

libs/ardour/ardour/importable_source.h

@@ -0,0 +1,48 @@
+/*
+    Copyright (C) 2007 Paul Davis 
+
+    This program 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.
+
+    This program 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 this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#ifndef __ardour_importable_source_h__
+#define __ardour_importable_source_h__
+
+#include <sndfile.h>
+#include <ardour/types.h>
+
+namespace ARDOUR {
+
+class ImportableSource {
+   public:
+    ImportableSource (SNDFILE* sf, SF_INFO* info) : in (sf), sf_info (info) {}
+    virtual ~ImportableSource() {}
+
+    virtual nframes_t read (Sample* buffer, nframes_t nframes) {
+	    nframes_t per_channel = nframes / sf_info->channels;
+	    per_channel = sf_readf_float (in, buffer, per_channel);
+	    return per_channel * sf_info->channels;
+    }
+
+    virtual float ratio() const { return 1.0f; }
+
+protected:
+       SNDFILE* in;
+       SF_INFO* sf_info;
+};
+
+}
+
+#endif /* __ardour_importable_source_h__ */