smsvn -> ssc-hg glue: rearrange directory structure

src/RageSoundReader_PitchChange.cpp

@@ -0,0 +1,124 @@
+/*
+ * Implements properties: 
+ *   "Speed" - cause the sound to play faster or slower
+ *   "Pitch" - raise or lower the pitch of the sound
+ *
+ * Pitch changing is implemented by combining speed changing and rate changing
+ * (via resampling).  The resampler needs to be changed later than the speed
+ * changer; this class just controls parameters on the other two real filters.
+ */
+
+#include "global.h"
+#include "RageSoundReader_PitchChange.h"
+#include "RageSoundReader_SpeedChange.h"
+#include "RageSoundReader_Resample_Good.h"
+#include "RageLog.h"
+
+RageSoundReader_PitchChange::RageSoundReader_PitchChange( RageSoundReader *pSource ):
+	RageSoundReader_Filter( NULL )
+{
+	m_pSpeedChange = new RageSoundReader_SpeedChange( pSource );
+	m_pResample = new RageSoundReader_Resample_Good( m_pSpeedChange, m_pSpeedChange->GetSampleRate() );
+	m_pSource = m_pResample;
+	m_fSpeedRatio = 1.0f;
+	m_fPitchRatio = 1.0f;
+	m_fLastSetSpeedRatio = m_fSpeedRatio;
+	m_fLastSetPitchRatio = m_fPitchRatio;
+}
+
+RageSoundReader_PitchChange::RageSoundReader_PitchChange( const RageSoundReader_PitchChange &cpy ):
+	RageSoundReader_Filter( cpy )
+{
+	/* The source tree has already been copied.  Our source is m_pResample; its source
+	 * is m_pSpeedChange (and its source is a copy of the pSource we were initialized
+	 * with). */
+	m_pResample = dynamic_cast<RageSoundReader_Resample_Good *>( &*m_pSource );
+	m_pSpeedChange = dynamic_cast<RageSoundReader_SpeedChange *>( m_pResample->GetSource() );
+	m_fSpeedRatio = cpy.m_fSpeedRatio;
+	m_fPitchRatio = cpy.m_fPitchRatio;
+	m_fLastSetSpeedRatio = cpy.m_fLastSetSpeedRatio;
+	m_fLastSetPitchRatio = cpy.m_fLastSetPitchRatio;
+}
+
+int RageSoundReader_PitchChange::Read( float *pBuf, int iFrames )
+{
+	/* m_pSpeedChange->NextReadWillStep is true if speed changes will be applied
+	 * immediately on the next Read().  When this is true, apply the ratio to the
+	 * resampler and the speed changer simultaneously, so they take effect as
+	 * closely together as possible. */
+	if( (m_fLastSetSpeedRatio != m_fSpeedRatio || m_fLastSetPitchRatio != m_fPitchRatio) &&
+		m_pSpeedChange->NextReadWillStep() )
+	{
+		float fRate = GetStreamToSourceRatio();
+
+		/* This is the simple way: */
+		// m_pResample->SetRate( m_fPitchRatio );
+		// m_pSpeedChange->SetSpeedRatio( m_fSpeedRatio / m_fPitchRatio );
+
+		/* However, the resampler has a limited granularity due to internal fixed-
+		 * point math, and the actual ratio will be slightly different than what
+		 * we tell it to use.  The actual ratio used is fActualPitchRatio. */
+		m_pResample->SetRate( m_fPitchRatio );
+		float fActualPitchRatio = m_pResample->GetRate();
+		float fRequestedSpeedRatio = m_fSpeedRatio / fActualPitchRatio;
+		m_pSpeedChange->SetSpeedRatio( fRequestedSpeedRatio );
+
+		m_fLastSetSpeedRatio = m_fSpeedRatio;
+		m_fLastSetPitchRatio = m_fPitchRatio;
+
+		/* If we just applied a new speed and it caused the ratio to change, return
+		 * no data, so the caller can see the new ratio. */
+		if( fRate != GetStreamToSourceRatio() )
+			return 0;
+	}
+
+	return RageSoundReader_Filter::Read( pBuf, iFrames );
+}
+
+bool RageSoundReader_PitchChange::SetProperty( const RString &sProperty, float fValue )
+{
+	if( sProperty == "Rate" )
+	{
+		/* Don't propagate this.  m_pResample will take it, but it's under
+		 * our control. */
+		return false;
+	}
+	if( sProperty == "Speed" )
+	{
+		SetSpeedRatio( fValue );
+		return true;
+	}
+
+	if( sProperty == "Pitch" )
+	{
+		SetPitchRatio( fValue );
+		return true;
+	}
+
+	return RageSoundReader_Filter::SetProperty( sProperty, fValue );
+}
+
+/*
+ * Copyright (c) 2006 Glenn Maynard
+ * All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, and/or sell copies of the Software, and to permit persons to
+ * whom the Software is furnished to do so, provided that the above
+ * copyright notice(s) and this permission notice appear in all copies of
+ * the Software and that both the above copyright notice(s) and this
+ * permission notice appear in supporting documentation.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF
+ * THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR HOLDERS
+ * INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL INDIRECT
+ * OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
+ * OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+ * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ */