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snes9x/msu1.cpp

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/*****************************************************************************\
Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
This file is licensed under the Snes9x License.
For further information, consult the LICENSE file in the root directory.
\*****************************************************************************/
#include "snes9x.h"
#include "memmap.h"
#include "display.h"
#include "msu1.h"
#include "apu/resampler.h"
#include "apu/bapu/dsp/blargg_endian.h"
#include <fstream>
#include <sys/stat.h>
STREAM dataStream = NULL;
STREAM audioStream = NULL;
uint32 audioLoopPos;
size_t partial_frames;
// Sample buffer
static Resampler *msu_resampler = NULL;
#ifdef UNZIP_SUPPORT
static int unzFindExtension(unzFile &file, const char *ext, bool restart = TRUE, bool print = TRUE, bool allowExact = FALSE)
{
unz_file_info info;
int port, l = strlen(ext), e = allowExact ? 0 : 1;
if (restart)
port = unzGoToFirstFile(file);
else
port = unzGoToNextFile(file);
while (port == UNZ_OK)
{
int len;
char name[132];
unzGetCurrentFileInfo(file, &info, name, 128, NULL, 0, NULL, 0);
len = strlen(name);
if (len >= l + e && strcasecmp(name + len - l, ext) == 0 && unzOpenCurrentFile(file) == UNZ_OK)
{
if (print)
printf("Using msu file %s", name);
return (port);
}
port = unzGoToNextFile(file);
}
return (port);
}
#endif
STREAM S9xMSU1OpenFile(const char *msu_ext, bool skip_unpacked)
{
const char *filename = S9xGetFilename(msu_ext, ROMFILENAME_DIR);
STREAM file = 0;
if (!skip_unpacked)
{
file = OPEN_STREAM(filename, "rb");
if (file)
printf("Using msu file %s.\n", filename);
}
#ifdef UNZIP_SUPPORT
// look for msu1 pack file in the rom or patch dir if msu data file not found in rom dir
if (!file)
{
const char *zip_filename = S9xGetFilename(".msu1", ROMFILENAME_DIR);
unzFile unzFile = unzOpen(zip_filename);
if (!unzFile)
{
zip_filename = S9xGetFilename(".msu1", PATCH_DIR);
unzFile = unzOpen(zip_filename);
}
if (unzFile)
{
int port = unzFindExtension(unzFile, msu_ext, true, true, true);
if (port == UNZ_OK)
{
printf(" in %s.\n", zip_filename);
file = new unzStream(unzFile);
}
else
unzClose(unzFile);
}
}
#endif
return file;
}
static void AudioClose()
{
if (audioStream)
{
CLOSE_STREAM(audioStream);
audioStream = NULL;
}
}
static bool AudioOpen()
{
MSU1.MSU1_STATUS |= AudioError;
AudioClose();
char ext[_MAX_EXT];
snprintf(ext, _MAX_EXT, "-%d.pcm", MSU1.MSU1_CURRENT_TRACK);
audioStream = S9xMSU1OpenFile(ext);
if (audioStream)
{
if (GETC_STREAM(audioStream) != 'M')
return false;
if (GETC_STREAM(audioStream) != 'S')
return false;
if (GETC_STREAM(audioStream) != 'U')
return false;
if (GETC_STREAM(audioStream) != '1')
return false;
READ_STREAM((char *)&audioLoopPos, 4, audioStream);
audioLoopPos = GET_LE32(&audioLoopPos);
audioLoopPos <<= 2;
audioLoopPos += 8;
MSU1.MSU1_AUDIO_POS = 8;
MSU1.MSU1_STATUS &= ~AudioError;
return true;
}
return false;
}
static void DataClose()
{
if (dataStream)
{
CLOSE_STREAM(dataStream);
dataStream = NULL;
}
}
static bool DataOpen()
{
DataClose();
dataStream = S9xMSU1OpenFile(".msu");
if(!dataStream)
dataStream = S9xMSU1OpenFile("msu1.rom");
return dataStream != NULL;
}
void S9xResetMSU(void)
{
MSU1.MSU1_STATUS = 0;
MSU1.MSU1_DATA_SEEK = 0;
MSU1.MSU1_DATA_POS = 0;
MSU1.MSU1_TRACK_SEEK = 0;
MSU1.MSU1_CURRENT_TRACK = 0;
MSU1.MSU1_RESUME_TRACK = 0;
MSU1.MSU1_VOLUME = 0;
MSU1.MSU1_CONTROL = 0;
MSU1.MSU1_AUDIO_POS = 0;
MSU1.MSU1_RESUME_POS = 0;
if (msu_resampler)
msu_resampler->clear();
partial_frames = 0;
DataClose();
AudioClose();
Settings.MSU1 = S9xMSU1ROMExists();
}
void S9xMSU1Init(void)
{
DataOpen();
}
void S9xMSU1DeInit(void)
{
DataClose();
AudioClose();
}
bool S9xMSU1ROMExists(void)
{
STREAM s = S9xMSU1OpenFile(".msu");
if (s)
{
CLOSE_STREAM(s);
return true;
}
#ifdef UNZIP_SUPPORT
char drive[_MAX_DRIVE + 1], dir[_MAX_DIR + 1], def[_MAX_FNAME + 1], ext[_MAX_EXT + 1];
_splitpath(Memory.ROMFilename, drive, dir, def, ext);
if (!strcasecmp(ext, ".msu1"))
return true;
unzFile unzFile = unzOpen(S9xGetFilename(".msu1", ROMFILENAME_DIR));
if(!unzFile)
unzFile = unzOpen(S9xGetFilename(".msu1", PATCH_DIR));
if (unzFile)
{
unzClose(unzFile);
return true;
}
#endif
return false;
}
void S9xMSU1Generate(size_t sample_count)
{
partial_frames += 4410 * (sample_count / 2);
while (partial_frames >= 3204)
{
if (MSU1.MSU1_STATUS & AudioPlaying && audioStream)
{
int32 sample;
int16* left = (int16*)&sample;
int16* right = left + 1;
int bytes_read = READ_STREAM((char *)&sample, 4, audioStream);
if (bytes_read == 4)
{
*left = ((int32)(int16)GET_LE16(left) * MSU1.MSU1_VOLUME / 255);
*right = ((int32)(int16)GET_LE16(right) * MSU1.MSU1_VOLUME / 255);
msu_resampler->push_sample(*left, *right);
MSU1.MSU1_AUDIO_POS += 4;
partial_frames -= 3204;
}
else
if (bytes_read >= 0)
{
if (MSU1.MSU1_STATUS & AudioRepeating)
{
MSU1.MSU1_AUDIO_POS = audioLoopPos;
REVERT_STREAM(audioStream, MSU1.MSU1_AUDIO_POS, 0);
}
else
{
MSU1.MSU1_STATUS &= ~(AudioPlaying | AudioRepeating);
REVERT_STREAM(audioStream, 8, 0);
}
}
else
{
MSU1.MSU1_STATUS &= ~(AudioPlaying | AudioRepeating);
}
}
else
{
MSU1.MSU1_STATUS &= ~(AudioPlaying | AudioRepeating);
partial_frames -= 3204;
msu_resampler->push_sample(0, 0);
}
}
}
uint8 S9xMSU1ReadPort(uint8 port)
{
switch (port)
{
case 0:
return MSU1.MSU1_STATUS | MSU1_REVISION;
case 1:
{
if (MSU1.MSU1_STATUS & DataBusy)
return 0;
if (!dataStream)
return 0;
int data = GETC_STREAM(dataStream);
if (data >= 0)
{
MSU1.MSU1_DATA_POS++;
return data;
}
return 0;
}
case 2:
return 'S';
case 3:
return '-';
case 4:
return 'M';
case 5:
return 'S';
case 6:
return 'U';
case 7:
return '1';
}
return 0;
}
void S9xMSU1WritePort(uint8 port, uint8 byte)
{
switch (port)
{
case 0:
MSU1.MSU1_DATA_SEEK &= 0xFFFFFF00;
MSU1.MSU1_DATA_SEEK |= byte << 0;
break;
case 1:
MSU1.MSU1_DATA_SEEK &= 0xFFFF00FF;
MSU1.MSU1_DATA_SEEK |= byte << 8;
break;
case 2:
MSU1.MSU1_DATA_SEEK &= 0xFF00FFFF;
MSU1.MSU1_DATA_SEEK |= byte << 16;
break;
case 3:
MSU1.MSU1_DATA_SEEK &= 0x00FFFFFF;
MSU1.MSU1_DATA_SEEK |= byte << 24;
MSU1.MSU1_DATA_POS = MSU1.MSU1_DATA_SEEK;
if (dataStream)
{
REVERT_STREAM(dataStream, MSU1.MSU1_DATA_POS, 0);
}
break;
case 4:
MSU1.MSU1_TRACK_SEEK &= 0xFF00;
MSU1.MSU1_TRACK_SEEK |= byte;
break;
case 5:
MSU1.MSU1_TRACK_SEEK &= 0x00FF;
MSU1.MSU1_TRACK_SEEK |= (byte << 8);
MSU1.MSU1_CURRENT_TRACK = MSU1.MSU1_TRACK_SEEK;
MSU1.MSU1_STATUS &= ~AudioPlaying;
MSU1.MSU1_STATUS &= ~AudioRepeating;
if (AudioOpen())
{
if (MSU1.MSU1_CURRENT_TRACK == MSU1.MSU1_RESUME_TRACK)
{
MSU1.MSU1_AUDIO_POS = MSU1.MSU1_RESUME_POS;
MSU1.MSU1_RESUME_POS = 0;
MSU1.MSU1_RESUME_TRACK = ~0;
}
else
{
MSU1.MSU1_AUDIO_POS = 8;
}
REVERT_STREAM(audioStream, MSU1.MSU1_AUDIO_POS, 0);
}
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 & (Play | Resume)) == Resume)
{
MSU1.MSU1_RESUME_TRACK = MSU1.MSU1_CURRENT_TRACK;
MSU1.MSU1_RESUME_POS = MSU1.MSU1_AUDIO_POS;
}
break;
}
}
size_t S9xMSU1Samples(void)
{
return msu_resampler->space_filled();
}
void S9xMSU1SetOutput(Resampler *resampler)
{
msu_resampler = resampler;
}
void S9xMSU1PostLoadState(void)
{
if (DataOpen())
{
REVERT_STREAM(dataStream, MSU1.MSU1_DATA_POS, 0);
}
if (MSU1.MSU1_STATUS & AudioPlaying)
{
if (AudioOpen())
{
REVERT_STREAM(audioStream, 4, 0);
READ_STREAM((char *)&audioLoopPos, 4, audioStream);
audioLoopPos = GET_LE32(&audioLoopPos);
audioLoopPos <<= 2;
audioLoopPos += 8;
REVERT_STREAM(audioStream, MSU1.MSU1_AUDIO_POS, 0);
}
else
{
MSU1.MSU1_STATUS &= ~(AudioPlaying | AudioRepeating);
MSU1.MSU1_STATUS |= AudioError;
}
}
if (msu_resampler)
msu_resampler->clear();
partial_frames = 0;
}
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