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#pragma once
#ifdef AUDIO_OAL
#include <AL/al.h>
#define NUM_STREAMBUFFERS 4
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)
{
return float(ms) / 1000.0f * float(GetChannels()) * float(GetSampleRate());
}
uint32 samples2ms(uint32 sm)
{
return float(sm) * 1000.0f / float(GetChannels()) / float(GetSampleRate());
}
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;
};
class CStream
{
char m_aFilename[128];
ALuint &m_alSource;
ALuint (&m_alBuffers)[NUM_STREAMBUFFERS];
bool m_bPaused;
bool m_bActive;
void *m_pBuffer;
bool m_bReset;
uint32 m_nVolume;
uint8 m_nPan;
uint32 m_nPosBeforeReset;
IDecoder *m_pSoundFile;
bool HasSource();
void SetPosition(float x, float y, float z);
void SetPitch(float pitch);
void SetGain(float gain);
void Pause();
void SetPlay(bool state);
bool FillBuffer(ALuint alBuffer);
int32 FillBuffers();
void ClearBuffers();
public:
static void Initialise();
static void Terminate();
CStream(char *filename, ALuint &source, ALuint (&buffers)[NUM_STREAMBUFFERS]);
~CStream();
void Delete();
bool IsOpened();
bool IsPlaying();
void SetPause (bool bPause);
void SetVolume(uint32 nVol);
void SetPan (uint8 nPan);
void SetPosMS (uint32 nPos);
uint32 GetPosMS();
uint32 GetLengthMS();
bool Setup();
void Start();
void Stop();
void Update(void);
void ProviderInit();
void ProviderTerm();
};
#endif
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