bool CDIF_ReadRawSector(uint8 *buf, uint32 lba)
{
bool found = FALSE;
// This shouldn't happen, the emulated-system-specific CDROM emulation code should make sure the emulated program doesn't try
// to read past the last "real" sector of the disc.
if(lba >= toc.tracks[100].lba)
{
printf("Attempt to read LBA %d, >= LBA %d\n", lba, toc.tracks[100].lba);
return(FALSE);
}
ReadThreadQueue->Write(CDIF_Message(CDIF_MSG_READ_SECTOR, lba, 0, 0, 0, NULL));
do
{
MDFND_LockMutex(SBMutex);
for(int i = 0; i < SBSize; i++)
{
if(SectorBuffers[i].valid && SectorBuffers[i].lba == lba)
{
memcpy(buf, SectorBuffers[i].data, 2352 + 96);
found = TRUE;
}
}
MDFND_UnlockMutex(SBMutex);
if(!found)
MDFND_Sleep(1);
} while(!found);
return(TRUE);
}
void CDIF_MT::HintReadSector(uint32 lba)
{
if(UnrecoverableError)
return;
ReadThreadQueue.Write(CDIF_Message(CDIF_MSG_READ_SECTOR, lba));
}
bool CDIF_Close(void)
{
ReadThreadQueue->Write(CDIF_Message(CDIF_MSG_DIEDIEDIE, 0, 0, 0, 0, NULL));
MDFND_WaitThread(CDReadThread, NULL);
if(SectorBuffers)
{
free(SectorBuffers);
SectorBuffers = NULL;
}
if(ReadThreadQueue)
{
delete ReadThreadQueue;
ReadThreadQueue = NULL;
}
if(EmuThreadQueue)
{
delete EmuThreadQueue;
EmuThreadQueue = NULL;
}
if(SBMutex)
{
MDFND_DestroyMutex(SBMutex);
SBMutex = NULL;
}
return(1);
}
CDIF_MT::~CDIF_MT()
{
bool thread_deaded_failed = false;
try
{
ReadThreadQueue.Write(CDIF_Message(CDIF_MSG_DIEDIEDIE));
}
catch(std::exception &e)
{
log_cb(RETRO_LOG_ERROR, "%s.\n", e.what());
thread_deaded_failed = true;
}
if(!thread_deaded_failed)
sthread_join((sthread_t*)CDReadThread);
if(SBMutex)
{
slock_free((slock_t*)SBMutex);
SBMutex = NULL;
}
if(disc_cdaccess)
{
delete disc_cdaccess;
disc_cdaccess = NULL;
}
}
bool CDIF_MT::ReadRawSector(uint8 *buf, uint32 lba)
{
bool found = FALSE;
bool error_condition = false;
if(UnrecoverableError)
{
memset(buf, 0, 2352 + 96);
return(false);
}
// This shouldn't happen, the emulated-system-specific CDROM emulation code should make sure the emulated program doesn't try
// to read past the last "real" sector of the disc.
if(lba >= disc_toc.tracks[100].lba)
{
printf("Attempt to read LBA %d, >= LBA %d\n", lba, disc_toc.tracks[100].lba);
return(FALSE);
}
ReadThreadQueue.Write(CDIF_Message(CDIF_MSG_READ_SECTOR, lba));
slock_lock((slock_t*)SBMutex);
do
{
int i;
for(i = 0; i < SBSize; i++)
{
if(SectorBuffers[i].valid && SectorBuffers[i].lba == lba)
{
error_condition = SectorBuffers[i].error;
memcpy(buf, SectorBuffers[i].data, 2352 + 96);
found = TRUE;
}
}
if(!found)
scond_wait((scond_t*)SBCond, (slock_t*)SBMutex);
} while(!found);
slock_unlock((slock_t*)SBMutex);
return(!error_condition);
}
bool CDIF_MT::Eject(bool eject_status)
{
if(UnrecoverableError)
return(false);
try
{
CDIF_Message msg;
ReadThreadQueue.Write(CDIF_Message(CDIF_MSG_EJECT, eject_status));
EmuThreadQueue.Read(&msg);
}
catch(std::exception &e)
{
log_cb(RETRO_LOG_ERROR, "Error on eject/insert attempt: %s\n", e.what());
return(false);
}
return(true);
}
bool CDIF_HintReadSector(uint32 lba)
{
ReadThreadQueue->Write(CDIF_Message(CDIF_MSG_READ_SECTOR, lba, 0, 0, 0, NULL));
return(1);
}
static int ReadThreadStart(void *arg)
{
char *device_name = (char *)arg;
bool Running = TRUE;
MDFN_printf(_("Loading %s...\n\n"), device_name ? device_name : _("PHYSICAL CDROM DISC"));
MDFN_indent(1);
if(!(p_cdrfile = cdrfile_open(device_name)))
{
MDFN_indent(-1);
EmuThreadQueue->Write(CDIF_Message(CDIF_MSG_INIT_DONE, FALSE, 0, 0, 0, NULL));
return(0);
}
if(!cdrfile_read_toc(p_cdrfile, &toc))
{
puts("Error reading TOC");
MDFN_indent(-1);
EmuThreadQueue->Write(CDIF_Message(CDIF_MSG_INIT_DONE, FALSE, 0, 0, 0, NULL));
return(0);
}
if(toc.first_track < 1 || toc.last_track > 99 || toc.first_track > toc.last_track)
{
puts("First/Last track numbers bad");
MDFN_indent(-1);
EmuThreadQueue->Write(CDIF_Message(CDIF_MSG_INIT_DONE, FALSE, 0, 0, 0, NULL));
return(0);
}
for(int32 track = toc.first_track; track <= toc.last_track; track++)
{
MDFN_printf(_("Track %2d, LBA: %6d %s\n"), track, toc.tracks[track].lba, (toc.tracks[track].control & 0x4) ? "DATA" : "AUDIO");
}
MDFN_printf("Leadout: %6d\n", toc.tracks[100].lba);
MDFN_indent(-1);
EmuThreadQueue->Write(CDIF_Message(CDIF_MSG_INIT_DONE, TRUE, 0, 0, 0, NULL));
while(Running)
{
CDIF_Message msg;
// Only do a blocking-wait for a message if we don't have any sectors to read-ahead.
// MDFN_DispMessage("%d %d %d\n", last_read_lba, ra_lba, ra_count);
if(ReadThreadQueue->Read(&msg, ra_count ? FALSE : TRUE))
{
switch(msg.message)
{
case CDIF_MSG_DIEDIEDIE: Running = FALSE;
break;
case CDIF_MSG_READ_SECTOR:
{
static const int max_ra = 16;
static const int initial_ra = 1;
static const int speedmult_ra = 2;
uint32 new_lba = msg.args[0];
assert((unsigned int)max_ra < (SBSize / 4));
if(new_lba == (last_read_lba + 1))
{
int how_far_ahead = ra_lba - new_lba;
assert(how_far_ahead >= 0);
if(how_far_ahead <= max_ra)
ra_count = std::min(speedmult_ra, 1 + max_ra - how_far_ahead);
else
ra_count++;
}
else
{
ra_lba = new_lba;
ra_count = initial_ra;
}
last_read_lba = new_lba;
}
break;
}
}
// Don't read >= the "end" of the disc, silly snake. Slither.
if(ra_count && ra_lba == toc.tracks[100].lba)
{
ra_count = 0;
//printf("Ephemeral scarabs: %d!\n", ra_lba);
}
if(ra_count)
{
uint8 tmpbuf[2352 + 96];
if(!cdrfile_read_raw_sector(p_cdrfile, tmpbuf, ra_lba))
{
printf("Sector %d read error! Abandon ship!", ra_lba);
memset(tmpbuf, 0, sizeof(tmpbuf));
}
MDFND_LockMutex(SBMutex);
SectorBuffers[SBWritePos].lba = ra_lba;
memcpy(SectorBuffers[SBWritePos].data, tmpbuf, 2352 + 96);
SectorBuffers[SBWritePos].valid = TRUE;
SBWritePos = (SBWritePos + 1) % SBSize;
MDFND_UnlockMutex(SBMutex);
ra_lba++;
ra_count--;
}
}
if(p_cdrfile)
{
cdrfile_destroy(p_cdrfile);
p_cdrfile = NULL;
}
return(1);
}
int CDIF_MT::ReadThreadStart()
{
bool Running = TRUE;
DiscEjected = true;
SBWritePos = 0;
ra_lba = 0;
ra_count = 0;
last_read_lba = ~0U;
try
{
RT_EjectDisc(false, true);
}
catch(std::exception &e)
{
EmuThreadQueue.Write(CDIF_Message(CDIF_MSG_FATAL_ERROR, std::string(e.what())));
return(0);
}
EmuThreadQueue.Write(CDIF_Message(CDIF_MSG_DONE));
while(Running)
{
CDIF_Message msg;
// Only do a blocking-wait for a message if we don't have any sectors to read-ahead.
// MDFN_DispMessage("%d %d %d\n", last_read_lba, ra_lba, ra_count);
if(ReadThreadQueue.Read(&msg, ra_count ? FALSE : TRUE))
{
switch(msg.message)
{
case CDIF_MSG_DIEDIEDIE:
Running = FALSE;
break;
case CDIF_MSG_EJECT:
try
{
RT_EjectDisc(msg.args[0]);
EmuThreadQueue.Write(CDIF_Message(CDIF_MSG_DONE));
}
catch(std::exception &e)
{
EmuThreadQueue.Write(CDIF_Message(CDIF_MSG_FATAL_ERROR, std::string(e.what())));
}
break;
case CDIF_MSG_READ_SECTOR:
{
static const int max_ra = 16;
static const int initial_ra = 1;
static const int speedmult_ra = 2;
uint32_t new_lba = msg.args[0];
assert((unsigned int)max_ra < (SBSize / 4));
if(last_read_lba != ~0U && new_lba == (last_read_lba + 1))
{
int how_far_ahead = ra_lba - new_lba;
if(how_far_ahead <= max_ra)
ra_count = MIN(speedmult_ra, 1 + max_ra - how_far_ahead);
else
ra_count++;
}
else if(new_lba != last_read_lba)
{
ra_lba = new_lba;
ra_count = initial_ra;
}
last_read_lba = new_lba;
}
break;
}
}
// Don't read >= the "end" of the disc, silly snake. Slither.
if(ra_count && ra_lba == disc_toc.tracks[100].lba)
{
ra_count = 0;
//printf("Ephemeral scarabs: %d!\n", ra_lba);
}
if(ra_count)
{
uint8_t tmpbuf[2352 + 96];
bool error_condition = false;
try
{
disc_cdaccess->Read_Raw_Sector(tmpbuf, ra_lba);
}
catch(std::exception &e)
{
log_cb(RETRO_LOG_ERROR, "Sector %u read error: %s\n", ra_lba, e.what());
memset(tmpbuf, 0, sizeof(tmpbuf));
error_condition = true;
}
slock_lock((slock_t*)SBMutex);
SectorBuffers[SBWritePos].lba = ra_lba;
memcpy(SectorBuffers[SBWritePos].data, tmpbuf, 2352 + 96);
SectorBuffers[SBWritePos].valid = TRUE;
SectorBuffers[SBWritePos].error = error_condition;
SBWritePos = (SBWritePos + 1) % SBSize;
scond_signal((scond_t*)SBCond);
slock_unlock((slock_t*)SBMutex);
ra_lba++;
ra_count--;
}
}
return(1);
}
