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

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2012-12-19 09:30:18 +00:00
/****************************************************************************
* *
* Project 64 - A Nintendo 64 emulator. *
* http://www.pj64-emu.com/ *
* Copyright (C) 2012 Project64. All rights reserved. *
* *
* License: *
* GNU/GPLv2 http://www.gnu.org/licenses/gpl-2.0.html *
* *
****************************************************************************/
#include "stdafx.h"
CAudio::CAudio (void)
{
Reset();
}
CAudio::~CAudio (void)
{
}
void CAudio::Reset ( void )
{
m_SecondBuff = 0;
m_Status = 0;
m_BytesPerSecond = 0;
m_CountsPerByte = g_System->AiCountPerBytes(); // should be calculated ... see below, instead allow from user settings
m_FramesPerSecond = 60;
}
DWORD CAudio::GetLength ( void )
{
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WriteTraceF(TraceAudio,__FUNCTION__ ": Start (m_SecondBuff = %d)",m_SecondBuff);
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DWORD TimeLeft = g_SystemTimer->GetTimer(CSystemTimer::AiTimerInterrupt), Res = 0;
if (TimeLeft > 0)
{
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Res = (TimeLeft / m_CountsPerByte) + m_SecondBuff;
}
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WriteTraceF(TraceAudio,__FUNCTION__ ": Done (res = %d, TimeLeft = %d)",Res, TimeLeft);
return Res;
}
DWORD CAudio::GetStatus ( void )
{
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WriteTraceF(TraceAudio,__FUNCTION__ ": m_Status = %X",m_Status);
return m_Status;
}
void CAudio::LenChanged ( void )
{
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WriteTraceF(TraceAudio,__FUNCTION__ ": Start (g_Reg->AI_LEN_REG = %d)",g_Reg->AI_LEN_REG);
if (g_Reg->AI_LEN_REG != 0)
{
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if (g_Reg->AI_LEN_REG >= 0x40000)
{
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WriteTraceF(TraceAudio,__FUNCTION__ ": *** Ignoring Write, To Large (%X)",g_Reg->AI_LEN_REG);
} else {
m_Status |= ai_full;
DWORD AudioLeft = g_SystemTimer->GetTimer(CSystemTimer::AiTimerInterrupt);
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if (AudioLeft == 0)
{
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if (m_SecondBuff)
{
g_Notify->BreakPoint(__FILE__,__LINE__);
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}
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WriteTraceF(TraceAudio,__FUNCTION__ ": Set Timer AI_LEN_REG: %d m_CountsPerByte: %d",g_Reg->AI_LEN_REG,m_CountsPerByte);
g_SystemTimer->SetTimer(CSystemTimer::AiTimerInterrupt,g_Reg->AI_LEN_REG * m_CountsPerByte,false);
} else {
WriteTraceF(TraceAudio,__FUNCTION__ ": Increasing Second Buffer (m_SecondBuff %d Increase: %d)",m_SecondBuff,g_Reg->AI_LEN_REG);
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m_SecondBuff += g_Reg->AI_LEN_REG;
}
}
} else {
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WriteTraceF(TraceAudio,__FUNCTION__ ": *** Reset Timer to 0");
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g_SystemTimer->StopTimer(CSystemTimer::AiTimerBusy);
g_SystemTimer->StopTimer(CSystemTimer::AiTimerInterrupt);
m_SecondBuff = 0;
m_Status = 0;
}
if (g_Plugins->Audio()->LenChanged != NULL)
{
g_Plugins->Audio()->LenChanged();
}
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WriteTraceF(TraceAudio,__FUNCTION__ ": Done");
}
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void CAudio::InterruptTimerDone ( void )
{
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WriteTraceF(TraceAudio,__FUNCTION__ ": Start (m_SecondBuff = %d)",m_SecondBuff);
if (m_SecondBuff != 0)
{
g_SystemTimer->SetTimer(CSystemTimer::AiTimerInterrupt,m_SecondBuff * m_CountsPerByte,false);
m_SecondBuff = 0;
} else {
if (g_Reg->m_AudioIntrReg == 0)
{
g_System->SyncToAudio();
}
g_Reg->MI_INTR_REG |= MI_INTR_AI;
g_Reg->CheckInterrupts();
m_Status &= ~ai_full;
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}
WriteTrace(TraceAudio,__FUNCTION__ ": Done");
}
void CAudio::BusyTimerDone ( void )
{
WriteTraceF(TraceAudio,__FUNCTION__ ": Start (m_SecondBuff = %d)",m_SecondBuff);
g_Notify->BreakPoint(__FILE__,__LINE__);
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m_Status &= ~ai_busy;
}
void CAudio::SetViIntr ( DWORD /*VI_INTR_TIME*/ )
{
/*
double CountsPerSecond = (DWORD)((double)VI_INTR_TIME * m_FramesPerSecond);
if (m_BytesPerSecond != 0)
{
//m_CountsPerByte = (double)CountsPerSecond / (double)m_BytesPerSecond;
}
*/
}
void CAudio::SetFrequency (DWORD Dacrate, DWORD System)
{
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WriteTraceF(TraceAudio,__FUNCTION__ "(Dacrate: %X System: %d): AI_BITRATE_REG = %X",Dacrate,System,g_Reg->AI_BITRATE_REG);
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;
m_BytesPerSecond = 194532;
m_BytesPerSecond = 128024;
m_FramesPerSecond = System == SYSTEM_PAL ? 50 : 60;
}