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1 files changed, 119 insertions, 0 deletions

diff --git a/utils/scenemanager/snd_audio_source.h b/utils/scenemanager/snd_audio_source.h
new file mode 100644
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+++ b/utils/scenemanager/snd_audio_source.h
@@ -0,0 +1,119 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $Workfile:     $
+// $Date:         $
+//
+//-----------------------------------------------------------------------------
+// $Log: $
+//
+// $NoKeywords: $
+//=============================================================================//
+
+#ifndef SND_AUDIO_SOURCE_H
+#define SND_AUDIO_SOURCE_H
+#pragma once
+
+
+// fixed point stuff for real-time resampling
+#define FIX_BITS			28
+#define FIX_SCALE			(1 << FIX_BITS)
+#define FIX_MASK			((1 << FIX_BITS)-1)
+#define FIX_FLOAT(a)		((int)((a) * FIX_SCALE))
+#define FIX(a)				(((int)(a)) << FIX_BITS)
+#define FIX_INTPART(a)		(((int)(a)) >> FIX_BITS)
+#define FIX_FRACTION(a,b)	(FIX(a)/(b))
+#define FIX_FRACPART(a)		((a) & FIX_MASK)
+
+typedef unsigned int fixedint;
+
+typedef struct channel_s channel_t;
+
+class CAudioSource;
+
+class IAudioDevice
+{
+public:
+	// Add a virtual destructor to silence the clang warning.
+	// This is harmless but not important since the only derived class
+	// doesn't have a destructor.
+	virtual ~IAudioDevice() {}
+
+	virtual void MixBegin( void ) = 0;
+	virtual void Mix8Mono( channel_t *pChannel, char *pData, int outputOffset, int inputOffset, int rateScaleFix, int outCount, int timecompress, bool forward = true ) = 0;
+	virtual void Mix8Stereo( channel_t *pChannel, char *pData, int outputOffset, int inputOffset, int rateScaleFix, int outCount, int timecompress, bool forward = true ) = 0;
+	virtual void Mix16Mono( channel_t *pChannel, short *pData, int outputOffset, int inputOffset, int rateScaleFix, int outCount, int timecompress, bool forward = true ) = 0;
+	virtual void Mix16Stereo( channel_t *pChannel, short *pData, int outputOffset, int inputOffset, int rateScaleFix, int outCount, int timecompress, bool forward = true ) = 0;
+	virtual int MaxSampleCount( void ) = 0;
+};
+
+//-----------------------------------------------------------------------------
+// Purpose: This is an instance of an audio source.
+//			Mixers are attached to channels and reference an audio source.
+//			Mixers are specific to the sample format and source format.
+//			Mixers are never re-used, so they can track instance data like
+//			sample position, fractional sample, stream cache, faders, etc.
+//-----------------------------------------------------------------------------
+class CAudioMixer
+{
+public:
+	virtual ~CAudioMixer( void ) {}
+
+	// UNDONE: time compress
+	virtual bool MixDataToDevice( IAudioDevice *pDevice, channel_t *pChannel, int startSample, int sampleCount, int outputRate, bool forward = true ) = 0;
+	virtual void IncrementSamples( channel_t *pChannel, int startSample, int sampleCount,int outputRate, bool forward = true ) = 0;
+	virtual bool SkipSamples( channel_t *pChannel, int startSample, int sampleCount, int outputRate, bool forward = true ) = 0;
+
+	virtual CAudioSource *GetSource( void ) = 0;
+
+	virtual int GetSamplePosition( void ) = 0;
+
+	virtual bool SetSamplePosition( int position ) = 0;
+	virtual void SetLoopPosition( int position ) = 0;
+	virtual int	GetStartPosition( void ) = 0;
+
+	virtual bool	GetActive( void ) = 0;
+	virtual void	SetActive( bool active ) = 0;
+
+	virtual void	SetModelIndex( int index ) = 0;
+	virtual int		GetModelIndex( void ) const = 0;
+
+	virtual void	SetDirection( bool forward ) = 0;
+	virtual bool	GetDirection( void ) const = 0;
+
+	virtual void	SetAutoDelete( bool autodelete ) = 0;
+	virtual bool	GetAutoDelete( void ) const = 0;
+};
+
+//-----------------------------------------------------------------------------
+// Purpose: A source is an abstraction for a stream, cached file, or procedural
+//			source of audio.
+//-----------------------------------------------------------------------------
+class CSentence;
+
+class CAudioSource
+{
+public:
+	CAudioSource( void );
+	virtual ~CAudioSource( void );
+
+	// Create an instance (mixer) of this audio source
+	virtual CAudioMixer			*CreateMixer( void ) = 0;
+	virtual int					GetOutputData( void **pData, int samplePosition, int sampleCount, bool forward = true ) = 0;
+	virtual int					SampleRate( void ) = 0;
+	virtual int					SampleSize( void ) = 0;
+	virtual int					SampleCount( void ) = 0;
+	virtual float				TrueSampleSize( void ) = 0;
+	virtual bool				IsLooped( void ) = 0;
+	virtual bool				IsStreaming( void ) = 0;
+	virtual float				GetRunningLength( void ) = 0;
+
+	virtual CSentence			*GetSentence( void ) { return NULL; };
+
+};
+
+
+extern CAudioSource *AudioSource_Create( const char *pName );
+
+#endif // SND_AUDIO_SOURCE_H