add SoundReader::OpenFile

stepmania/src/RageSoundReader.cpp

@@ -0,0 +1,41 @@
+#include "global.h"
+#include "RageSoundReader.h"
+#include "RageUtil.h"
+
+#ifndef NO_WAV_SUPPORT
+#include "RageSoundReader_WAV.h"
+#endif
+
+#if defined(OGG_ONLY)
+#include "RageSoundReader_Vorbisfile.h"
+#define RageSoundReader_LowLevel RageSoundReader_Vorbisfile
+#else
+#include "RageSoundReader_SDL_Sound.h"
+#define RageSoundReader_LowLevel SoundReader_SDL_Sound
+#endif
+
+
+SoundReader *SoundReader::OpenFile( CString filename, CString error )
+{
+    SoundReader_FileReader *NewSample = NULL;
+
+	/* First try based on extension.  If that fails, try all other decoders.
+	 * Optimally, we should have separate error returns indicating "this isn't
+	 * an XXX file" vs. "this is an XXX file, but we don't support something in
+	 * it", for better error string returns.
+	 */
+#ifndef NO_WAV_SUPPORT
+	if( !GetExtension(filename).CompareNoCase("wav") )
+		NewSample = new RageSoundReader_WAV;
+#endif
+
+	if( NewSample == NULL )
+		NewSample = new RageSoundReader_LowLevel;
+	if( !NewSample->Open(filename) )
+	{
+		error = NewSample->GetError();
+		return NULL;
+	}
+
+	return NewSample;
+}

stepmania/src/RageSoundReader.h

@@ -21,6 +21,7 @@ public:
 
 	bool Error() const { return !error.empty(); }
 	string GetError() const { return error; }
+	static SoundReader *OpenFile( CString filename, CString error );
 };
 
 #endif