project64/Source/Project64/N64 System/Mips/Audio.cpp

98 lines
2.0 KiB
C++

#include "stdafx.h"
CAudio::CAudio (void)
{
Reset();
}
CAudio::~CAudio (void)
{
}
void CAudio::Reset ( void )
{
m_CurrentLength = 0;
m_SecondBuff = 0;
m_Status = 0;
m_CountsPerByte = 500; // should be calculated ... see below
m_FramesPerSecond = 60;
}
DWORD CAudio::GetLength ( void )
{
DWORD TimeLeft = _SystemTimer->GetTimer(CSystemTimer::AiTimer);
if (TimeLeft > 0)
{
return TimeLeft / m_CountsPerByte;
}
return 0;
}
DWORD CAudio::GetStatus ( void )
{
return m_Status;
}
void CAudio::LenChanged ( void )
{
if (_Reg->AI_LEN_REG == 0)
{
return;
}
if (m_CurrentLength == 0) {
m_CurrentLength = _Reg->AI_LEN_REG;
_SystemTimer->SetTimer(CSystemTimer::AiTimer,m_CurrentLength * m_CountsPerByte,false);
} else {
m_SecondBuff = _Reg->AI_LEN_REG;
m_Status |= 0x80000000;
}
if (_Plugins->Audio()->LenChanged != NULL)
{
_Plugins->Audio()->LenChanged();
}
}
void CAudio::TimerDone ( void )
{
if (m_SecondBuff != 0) {
_SystemTimer->SetTimer(CSystemTimer::AiTimer,m_SecondBuff * m_CountsPerByte,true);
}
m_CurrentLength = m_SecondBuff;
m_SecondBuff = 0;
m_Status &= 0x7FFFFFFF;
}
void CAudio::SetViIntr ( DWORD VI_INTR_TIME )
{
double CountsPerSecond = (DWORD)((double)VI_INTR_TIME * m_FramesPerSecond);
m_CountsPerByte = (double)CountsPerSecond / (double)m_BytesPerSecond;
//m_CountsPerByte = 490; // donkey kong
//m_CountsPerByte = 100; // Paper mario
//m_CountsPerByte = 490; // Paper mario
}
void CAudio::SetFrequency (DWORD Dacrate, DWORD System)
{
DWORD Frequency;
switch (System) {
case SYSTEM_PAL: Frequency = 49656530 / (Dacrate + 1); break;
case SYSTEM_MPAL: Frequency = 48628316 / (Dacrate + 1); break;
default: Frequency = 48681812 / (Dacrate + 1); break;
}
//nBlockAlign = 16 / 8 * 2;
m_BytesPerSecond = Frequency * 4;
if (System == SYSTEM_PAL) {
m_FramesPerSecond = 50.0;
} else {
m_FramesPerSecond = 60.0;
}
}