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re3/src/audio/oal/stream.h

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#pragma once
#ifdef AUDIO_OAL
#include <AL/al.h>
#define NUM_STREAMBUFFERS 8
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class IDecoder
{
public:
virtual ~IDecoder() { }
virtual bool IsOpened() = 0;
virtual uint32 GetSampleSize() = 0;
virtual uint32 GetSampleCount() = 0;
virtual uint32 GetSampleRate() = 0;
virtual uint32 GetChannels() = 0;
uint32 GetAvgSamplesPerSec()
{
return GetChannels() * GetSampleRate();
}
uint32 ms2samples(uint32 ms)
{
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return float(ms) / 1000.0f * float(GetSampleRate());
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}
uint32 samples2ms(uint32 sm)
{
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return float(sm) * 1000.0f / float(GetSampleRate());
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}
uint32 GetBufferSamples()
{
//return (GetAvgSamplesPerSec() >> 2) - (GetSampleCount() % GetChannels());
return (GetAvgSamplesPerSec() / 4); // 250ms
}
uint32 GetBufferSize()
{
return GetBufferSamples() * GetSampleSize();
}
virtual void Seek(uint32 milliseconds) = 0;
virtual uint32 Tell() = 0;
uint32 GetLength()
{
return float(GetSampleCount()) * 1000.0f / float(GetSampleRate());
}
virtual uint32 Decode(void *buffer) = 0;
};
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class CStream
{
char m_aFilename[128];
ALuint *m_pAlSources;
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ALuint (&m_alBuffers)[NUM_STREAMBUFFERS];
bool m_bPaused;
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bool m_bActive;
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void *m_pBuffer;
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bool m_bReset;
uint32 m_nVolume;
uint8 m_nPan;
uint32 m_nPosBeforeReset;
IDecoder *m_pSoundFile;
bool HasSource();
void SetPosition(int i, float x, float y, float z);
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void SetPitch(float pitch);
void SetGain(float gain);
void Pause();
void SetPlay(bool state);
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bool FillBuffer(ALuint *alBuffer);
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int32 FillBuffers();
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void ClearBuffers();
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public:
static void Initialise();
static void Terminate();
CStream(char *filename, ALuint *sources, ALuint (&buffers)[NUM_STREAMBUFFERS]);
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~CStream();
void Delete();
bool IsOpened();
bool IsPlaying();
void SetPause (bool bPause);
void SetVolume(uint32 nVol);
void SetPan (uint8 nPan);
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void SetPosMS (uint32 nPos);
uint32 GetPosMS();
uint32 GetLengthMS();
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bool Setup();
void Start();
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void Stop();
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void Update(void);
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void ProviderInit();
void ProviderTerm();
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};
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#endif