project64/Source/Project64/Plugins/Audio Plugin.cpp

/****************************************************************************
*                                                                           *
* 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"

CAudioPlugin::CAudioPlugin() :
	m_hAudioThread(NULL),
	AiDacrateChanged(NULL),
	AiLenChanged(NULL),
	AiReadLength(NULL),
	ProcessAList(NULL),
	AiUpdate(NULL)
{
}

CAudioPlugin::~CAudioPlugin()
{
	Close();
	UnloadPlugin();
}

bool CAudioPlugin::LoadFunctions ( void )
{
	// Find entries for functions in DLL
	void  (__cdecl *InitiateAudio)     ( void );
	LoadFunction(InitiateAudio);
	LoadFunction(AiDacrateChanged);
	LoadFunction(AiLenChanged);
	LoadFunction(AiReadLength);
	LoadFunction(AiUpdate);
	LoadFunction(ProcessAList);

	// Make sure dll has all needed functions
	if (AiDacrateChanged == NULL) { UnloadPlugin(); return false;  }
	if (AiLenChanged == NULL) { UnloadPlugin(); return false;  }
	if (AiReadLength == NULL) { UnloadPlugin(); return false;  }
	if (InitiateAudio == NULL) { UnloadPlugin(); return false;  }
	if (ProcessAList   == NULL) { UnloadPlugin(); return false;  }

	if (m_PluginInfo.Version >= 0x0102)
	{
		if (PluginOpened == NULL) { UnloadPlugin(); return false; }
	}
	return true;
}

bool CAudioPlugin::Initiate(CN64System * System, CMainGui * RenderWindow)
{
	struct AUDIO_INFO {
		HWND hwnd;
		HINSTANCE hinst;

		BOOL MemoryBswaped;    // If this is set to TRUE, then the memory has been pre
							   //   bswap on a dword (32 bits) boundry 
							   //	eg. the first 8 bytes are stored like this:
							   //        4 3 2 1   8 7 6 5
		BYTE * HEADER;	// This is the rom header (first 40h bytes of the rom
						// This will be in the same memory format as the rest of the memory.
		BYTE * RDRAM;
		BYTE * DMEM;
		BYTE * IMEM;

		DWORD * MI__INTR_REG;

		DWORD * AI__DRAM_ADDR_REG;
		DWORD * AI__LEN_REG;
		DWORD * AI__CONTROL_REG;
		DWORD * AI__STATUS_REG;
		DWORD * AI__DACRATE_REG;
		DWORD * AI__BITRATE_REG;

		void (__cdecl *CheckInterrupts)( void );
	};

	//Get Function from DLL
	BOOL (__cdecl *InitiateAudio)( AUDIO_INFO Audio_Info );
	LoadFunction(InitiateAudio);
	if (InitiateAudio == NULL) { return false; }

	AUDIO_INFO Info = { 0 };

	Info.hwnd = (HWND)RenderWindow->m_hMainWindow;;
	Info.hinst = GetModuleHandle(NULL);
	Info.MemoryBswaped = TRUE;
	Info.CheckInterrupts = DummyCheckInterrupts;

	// We are initializing the plugin before any rom is loaded so we do not have any correct
	// parameters here.. just needed to we can config the DLL.
	if (System == NULL)
	{
		BYTE Buffer[100];
		DWORD Value = 0;

		Info.HEADER = Buffer;
		Info.RDRAM = Buffer;
		Info.DMEM = Buffer;
		Info.IMEM = Buffer;
		Info.MI__INTR_REG = &Value;
		Info.AI__DRAM_ADDR_REG = &Value;
		Info.AI__LEN_REG = &Value;
		Info.AI__CONTROL_REG = &Value;
		Info.AI__STATUS_REG = &Value;
		Info.AI__DACRATE_REG = &Value;
		Info.AI__BITRATE_REG = &Value;
	}
	// Send initialization information to the DLL
	else
	{
		Info.HEADER = g_Rom->GetRomAddress();
		Info.RDRAM = g_MMU->Rdram();
		Info.DMEM = g_MMU->Dmem();
		Info.IMEM = g_MMU->Imem();
		Info.MI__INTR_REG = &g_Reg->m_AudioIntrReg;
		Info.AI__DRAM_ADDR_REG = &g_Reg->AI_DRAM_ADDR_REG;
		Info.AI__LEN_REG = &g_Reg->AI_LEN_REG;
		Info.AI__CONTROL_REG = &g_Reg->AI_CONTROL_REG;
		Info.AI__STATUS_REG = &g_Reg->AI_STATUS_REG;
		Info.AI__DACRATE_REG = &g_Reg->AI_DACRATE_REG;
		Info.AI__BITRATE_REG = &g_Reg->AI_BITRATE_REG;
	}

	m_Initialized = InitiateAudio(Info) != 0;

	//jabo had a bug so I call CreateThread so his dllmain gets called again
	DWORD ThreadID;
	HANDLE hthread = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)DummyFunction, NULL, 0, &ThreadID);
	CloseHandle(hthread);

	if (System != NULL)
	{
		if (AiUpdate)
		{ 
			m_hAudioThread = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)AudioThread, (LPVOID)this, 0, &ThreadID);
		}
	
		if (g_Reg->AI_DACRATE_REG != 0)
		{
			DacrateChanged(System->SystemType());
		}
	}
	return m_Initialized;
}

void CAudioPlugin::UnloadPluginDetails(void)
{
	if (m_hAudioThread)
	{
		WriteTraceF(TraceAudio, __FUNCTION__ ": Terminate Audio Thread");
		TerminateThread(m_hAudioThread, 0);
		m_hAudioThread = NULL;
	}
	AiDacrateChanged = NULL;
	AiLenChanged = NULL;
	AiReadLength = NULL;
	AiUpdate = NULL;
	ProcessAList = NULL;
}

void CAudioPlugin::DacrateChanged(SYSTEM_TYPE Type)
{
	if (!Initialized()) { return; }
	WriteTraceF(TraceAudio, __FUNCTION__ ": SystemType: %s", Type == SYSTEM_NTSC ? "SYSTEM_NTSC" : "SYSTEM_PAL");

	//DWORD Frequency = g_Reg->AI_DACRATE_REG * 30;
	//DWORD CountsPerSecond = (g_Reg->VI_V_SYNC_REG != 0 ? (g_Reg->VI_V_SYNC_REG + 1) * g_Settings->LoadDword(Game_ViRefreshRate) : 500000) * 60;
	AiDacrateChanged(Type);
}

void CAudioPlugin::AudioThread(CAudioPlugin * _this) {
	SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_TIME_CRITICAL);
	for (;;)
	{
		_this->AiUpdate(true);
	}
}