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utils/hlfaceposer/audiowaveoutput.h

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+//========= Copyright <20> 1996-2005, Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//=============================================================================//
+
+#ifndef AUDIOWAVEOUTPUT_H
+#define AUDIOWAVEOUTPUT_H
+#ifdef _WIN32
+#pragma once
+#endif
+
+#include "sound.h"
+#include "UtlVector.h"
+
+#define OUTPUT_BUFFER_COUNT		32
+#define MAX_CHANNELS			16
+
+class CAudioMixer;
+
+class CAudioMixerState
+{
+public:
+	CAudioMixer		*mixer;
+	int				submit_mixer_sample;
+};
+
+class CAudioBuffer
+{
+public:
+	WAVEHDR			*hdr;
+	bool			submitted;
+	int				submit_sample_count;
+
+	CUtlVector< CAudioMixerState > m_Referenced;
+};
+
+#define OUTPUT_SAMPLE_RATE		44100
+#define	PAINTBUFFER_SIZE		1024
+
+typedef struct
+{
+	int left;
+	int	right;
+} portable_samplepair_t;
+
+class CAudioDeviceSWMix : public IAudioDevice
+{
+public:
+	virtual void	Mix8Mono( channel_t *pChannel, char *pData, int outputOffset, int inputOffset, int rateScaleFix, int outCount, int timecompress, bool forward = true );
+	virtual void	Mix8Stereo( channel_t *pChannel, char *pData, int outputOffset, int inputOffset, int rateScaleFix, int outCount, int timecompress, bool forward = true );
+	virtual void	Mix16Mono( channel_t *pChannel, short *pData, int outputOffset, int inputOffset, int rateScaleFix, int outCount, int timecompress, bool forward = true );
+	virtual void	Mix16Stereo( channel_t *pChannel, short *pData, int outputOffset, int inputOffset, int rateScaleFix, int outCount, int timecompress, bool forward = true );
+	virtual int		MaxSampleCount( void );
+	virtual void	MixBegin( void );
+
+	void			TransferBufferStereo16( short *pOutput, int sampleCount );
+
+private:
+	portable_samplepair_t		m_paintbuffer[ PAINTBUFFER_SIZE ];
+};
+
+class CAudioWaveOutput : public CAudioOutput
+{
+public:
+	CAudioWaveOutput( void );
+	~CAudioWaveOutput( void );
+
+	// returns the size of each sample in bytes
+	virtual int SampleSize( void ) { return 2; }
+	
+	// returns the sampling rate of the data
+	virtual int SampleRate( void ) { return OUTPUT_SAMPLE_RATE; }
+
+	// returns the mono/stereo status of this device (true if stereo)
+	virtual bool IsStereo( void ) { return true; }
+
+	// mix a buffer up to time (time is absolute)
+	virtual void Update( float time );
+
+	virtual void Flush( void );
+
+	virtual void AddSource( CAudioMixer *pSource );
+	virtual void StopSounds( void );
+	virtual int FindSourceIndex( CAudioMixer *pSource );
+
+	virtual int GetOutputPosition( void );
+	virtual float GetAmountofTimeAhead( void );
+	virtual int GetNumberofSamplesAhead( void );
+
+	virtual CAudioMixer *GetMixerForSource( CAudioSource *pSource );
+
+
+private:
+	void	OpenDevice( void );
+	bool	ValidDevice( void ) { return m_deviceHandle != 0; }
+	void	ClearDevice( void ) { m_deviceHandle = NULL; }
+	CAudioBuffer *GetEmptyBuffer( void );
+	void	SilenceBuffer( short *pSamples, int sampleCount );
+
+	void	SetChannel( int channelIndex, CAudioMixer *pSource );
+	void	FreeChannel( int channelIndex );
+
+	void	RemoveMixerChannelReferences( CAudioMixer *mixer );
+	void	AddToReferencedList( CAudioMixer *mixer, CAudioBuffer *buffer );
+	void	RemoveFromReferencedList( CAudioMixer *mixer, CAudioBuffer *buffer );
+	bool	IsSourceReferencedByActiveBuffer( CAudioMixer *mixer );
+	bool	IsSoundInReferencedList( CAudioMixer *mixer, CAudioBuffer *buffer );
+
+	// Compute how many samples we've mixed since most recent buffer submission
+	void	ComputeSampleAheadAmount( void );
+
+	HWAVEOUT		m_deviceHandle;
+
+	float			m_mixTime;
+	float			m_baseTime;
+	int				m_sampleIndex;
+	CAudioBuffer	m_buffers[ OUTPUT_BUFFER_COUNT ];
+
+	CAudioMixer		*m_sourceList[MAX_CHANNELS];
+	int				m_nEstimatedSamplesAhead;
+public:
+	CAudioDeviceSWMix	m_audioDevice;
+
+};
+#endif // AUDIOWAVEOUTPUT_H