105 lines
3.1 KiB
C++
105 lines
3.1 KiB
C++
#include "stdafx.h"
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// ****************** Testing Audio Stuff *****************
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CAudio::CAudio (void)
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{
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ResetAudioSettings();
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}
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// I seem to be getting clicking when I set CF to 1 and VSyncTiming to 789000
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void CAudio::ResetAudioSettings (void)
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{
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//float CAudio::VSyncTiming = 789000.0f; // 500000
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////const float VSyncTiming = 760000.0f;
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m_FramesPerSecond = 60.0f;
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m_BytesPerSecond = 0;
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m_Length = 0;
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m_Status = 0;
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m_CountsPerByte = 0;
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m_SecondBuff = 0;
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m_CurrentCount = 0;
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m_CurrentLength = 0;
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m_IntScheduled = 0;
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m_VSyncTiming = 789000.0f;
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}
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void CAudio::AiCallBack ()
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{
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if (m_SecondBuff != 0) {
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m_IntScheduled = (DWORD)((double)m_SecondBuff * m_CountsPerByte);
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_Notify->BreakPoint(__FILE__,__LINE__);
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#ifdef tofix
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_Reg->ChangeTimerFixed(AiTimer, m_IntScheduled);
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#endif
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}
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m_CurrentCount = _Reg->COUNT_REGISTER;
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m_CurrentLength = m_SecondBuff;
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m_SecondBuff = 0;
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m_Status &= 0x7FFFFFFF;
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}
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DWORD CAudio::AiGetLength (void)
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{
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double AiCounts;
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// static DWORD LengthReadHack = 0;
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// if ((COUNT_REGISTER - LengthReadHack) < 0x20) {
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// // This is a Spin Lock... ;-/
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// //COUNT_REGISTER += (DWORD)(CountsPerByte*0.5); // Lets speed up the CPU to the next Event
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// //CurrentLength = 0;
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// COUNT_REGISTER+=0xA; // This hack is necessary... but what is a good value??
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// }
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// LengthReadHack = COUNT_REGISTER;
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AiCounts = m_CountsPerByte * m_CurrentLength;
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AiCounts = AiCounts - (double)(_Reg->COUNT_REGISTER - m_CurrentCount);
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if (AiCounts < 0)
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{
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return 0;
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}
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// return 0;
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return (DWORD)(AiCounts / m_CountsPerByte);
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}
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DWORD CAudio::AiGetStatus (void)
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{
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return m_Status;
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}
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void CAudio::AiSetLength (void)
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{
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// Set Status to FULL for a few COUNT cycles
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if (m_CurrentLength == 0) {
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m_CurrentLength = _Reg->AI_LEN_REG;
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m_CurrentCount = _Reg->COUNT_REGISTER;
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m_IntScheduled = (DWORD)((double)_Reg->AI_LEN_REG * m_CountsPerByte);
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_SystemTimer->SetTimer(CSystemTimer::AiTimer,m_IntScheduled,false);
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} else {
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m_SecondBuff = _Reg->AI_LEN_REG;
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m_Status |= 0x80000000;
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}
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}
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void CAudio::UpdateAudioTimer (DWORD CountsPerFrame)
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{
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double CountsPerSecond = (DWORD)((double)CountsPerFrame * m_FramesPerSecond); // This will only work with NTSC... VSyncTiming...
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m_CountsPerByte = CountsPerSecond / (double)m_BytesPerSecond;
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}
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void CAudio::AiSetFrequency (DWORD Dacrate, DWORD System) {
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double CountsPerSecond;
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switch (System) {
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case SYSTEM_NTSC: m_BytesPerSecond = 48681812 / (Dacrate + 1); break;
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case SYSTEM_PAL: m_BytesPerSecond = 49656530 / (Dacrate + 1); break;
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case SYSTEM_MPAL: m_BytesPerSecond = 48628316 / (Dacrate + 1); break;
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}
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if (System == SYSTEM_PAL) {
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m_FramesPerSecond = 50.0;
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} else {
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m_FramesPerSecond = 60.0;
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}
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m_BytesPerSecond = (m_BytesPerSecond * 4); // This makes it Bytes Per Second...
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CountsPerSecond = (double)(((double)m_VSyncTiming) * (double)60.0); // This will only work with NTSC... VSyncTiming...
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m_CountsPerByte = (double)CountsPerSecond / (double)m_BytesPerSecond;
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m_SecondBuff = m_Status = m_CurrentLength = 0;
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//CountsPerByte /= CountPerOp;
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}
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