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