snes9x/msu1.cpp

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#include "snes9x.h"
#include "display.h"
#include "msu1.h"
#include <fstream>
std::ifstream dataFile, audioFile;
uint32 dataPos, audioPos, audioResumePos, audioLoopPos;
uint16 audioTrack, audioResumeTrack;
char fName[64];
// Sample buffer
int16 *bufPos, *bufBegin, *bufEnd;
void S9xMSU1Init(void)
{
MSU1.MSU1_STATUS = 0;
MSU1.MSU1_SEEK = 0;
MSU1.MSU1_TRACK = 0;
MSU1.MSU1_VOLUME = 0;
MSU1.MSU1_CONTROL = 0;
dataPos = 0;
audioPos = 0;
audioResumePos = 0;
audioTrack = 0;
audioResumeTrack = 0;
bufPos = 0;
bufBegin = 0;
bufEnd = 0;
if (dataFile.is_open())
dataFile.close();
if (audioFile.is_open())
audioFile.close();
dataFile.open(S9xGetFilename(".msu", ROMFILENAME_DIR), std::ios::in | std::ios::binary);
}
void S9xMSU1Execute(void)
{
static long long hitcount = 0;
//return; // Dummy out for now because it's broken
while ((bufPos < bufEnd) && (MSU1.MSU1_STATUS & AudioPlaying))
{
hitcount++;
if (audioFile.good())
{
audioPos += 2;
int16 sample = 0;
((uint8 *)&sample)[0] = audioFile.get();
((uint8 *)&sample)[1] = audioFile.get();
sample = (double)sample * (double)MSU1.MSU1_VOLUME / 255.0;
*bufPos = ((uint8 *)&sample)[0];
*(bufPos + 1) = ((uint8 *)&sample)[1];
bufPos += 2;
if (audioFile.eof())
{
if (MSU1.MSU1_STATUS & AudioRepeating)
{
audioPos = audioLoopPos;
audioFile.seekg(audioPos);
}
else
{
MSU1.MSU1_STATUS &= ~(AudioPlaying | AudioRepeating);
audioFile.seekg(8);
return;
}
}
}
else
{
MSU1.MSU1_STATUS &= ~AudioPlaying;
}
}
}
uint8 S9xMSU1ReadPort(int port)
{
switch (port)
{
case 0:
return MSU1.MSU1_STATUS;
case 1:
if (MSU1.MSU1_STATUS & DataBusy)
return 0;
if (dataFile.fail() || dataFile.bad() || dataFile.eof())
return 0;
return dataFile.get();
case 2:
return 'S';
case 3:
return '-';
case 4:
return 'M';
case 5:
return 'S';
case 6:
return 'U';
case 7:
return '1';
}
}
void S9xMSU1WritePort(int port, uint8 byte)
{
switch (port)
{
case 0:
((uint8 *)(&MSU1.MSU1_SEEK))[0] = byte;
break;
case 1:
((uint8 *)(&MSU1.MSU1_SEEK))[1] = byte;
break;
case 2:
((uint8 *)(&MSU1.MSU1_SEEK))[2] = byte;
break;
case 3:
((uint8 *)(&MSU1.MSU1_SEEK))[3] = byte;
dataPos = MSU1.MSU1_SEEK;
if(dataFile.good())
dataFile.seekg(dataPos);
break;
case 4:
((uint8 *)(&MSU1.MSU1_TRACK))[0] = byte;
break;
case 5:
((uint8 *)(&MSU1.MSU1_TRACK))[1] = byte;
audioTrack = MSU1.MSU1_TRACK;
if (audioFile.is_open())
audioFile.close();
// This is an ugly hack... need to see if there's a better way to get the base name without extension
sprintf(fName, "%s", S9xGetFilename(".msu", ROMFILENAME_DIR));
fName[strlen(fName) - 4] = '\0';
sprintf(fName, "%s-%d.pcm", fName, audioTrack);
audioFile.open(fName);
if (audioFile.is_open() && audioFile.good())
{
MSU1.MSU1_STATUS |= AudioError;
if (audioFile.get() != 'M')
break;
if (audioFile.get() != 'S')
break;
if (audioFile.get() != 'U')
break;
if (audioFile.get() != '1')
break;
((uint8 *)(&audioLoopPos))[0] = audioFile.get();
((uint8 *)(&audioLoopPos))[1] = audioFile.get();
((uint8 *)(&audioLoopPos))[2] = audioFile.get();
((uint8 *)(&audioLoopPos))[3] = audioFile.get();
audioLoopPos += 8;
MSU1.MSU1_STATUS &= ~AudioPlaying;
MSU1.MSU1_STATUS &= ~AudioRepeating;
if (audioTrack == audioResumeTrack)
{
audioPos = audioResumePos;
audioResumeTrack = 0xFFFF;
audioResumePos = 0;
}
else
audioPos = 8;
audioFile.seekg(audioPos);
MSU1.MSU1_STATUS &= ~AudioError;
}
else
MSU1.MSU1_STATUS |= AudioError;
break;
case 6:
MSU1.MSU1_VOLUME = byte;
break;
case 7:
if (MSU1.MSU1_STATUS & (AudioBusy | AudioError))
break;
MSU1.MSU1_STATUS = (MSU1.MSU1_STATUS & ~0x30) | ((byte & 0x03) << 4);
if ((byte & 0x05) == 0x05)
audioResumeTrack = audioTrack;
break;
}
}
uint16 S9xMSU1Samples(void)
{
return bufPos - bufBegin;
}
void S9xMSU1SetOutput(int16 * out, int size)
{
bufPos = bufBegin = out;
bufEnd = out + size;
}