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CDROM: Use seek time formula from Mednafen

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This commit is contained in:
Connor McLaughlin 2019-11-10 15:01:18 +10:00
parent c0208b6e78
commit 68fe492130
2 changed files with 22 additions and 10 deletions
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30
src/core/cdrom.cpp
View file

@ -501,12 +501,22 @@ TickCount CDROM::GetTicksForRead() const
TickCount CDROM::GetTicksForSeek() const
{
const CDImage::LBA current_lba = m_media->GetPositionOnDisc();
const CDImage::LBA current_lba = m_secondary_status.motor_on ? m_media->GetPositionOnDisc() : 0;
const CDImage::LBA new_lba = m_setloc_position.ToLBA();
const u32 lba_diff = static_cast<u32>((new_lba > current_lba) ? (new_lba - current_lba) : (current_lba - new_lba));
const TickCount ticks = static_cast<TickCount>(20000 + lba_diff * 100);
Log_DebugPrintf("Seek time for %u LBAs: %d", lba_diff, ticks);
// const TickCount ticks = static_cast<TickCount>(20000 + lba_diff * 100);
// Formula from Mednafen.
TickCount ticks = std::max<TickCount>(20000, lba_diff * MASTER_CLOCK * 1000 / (72 * 60 * 75) / 1000);
if (!m_secondary_status.motor_on)
ticks += MASTER_CLOCK;
else if (m_drive_state == DriveState::Idle) // paused
ticks += 1237952 << (BoolToUInt8(!m_mode.double_speed));
if (lba_diff >= 2550)
ticks += static_cast<TickCount>(u64(MASTER_CLOCK) * 300 / 1000);
Log_DevPrintf("Seek time for %u LBAs: %d", lba_diff, ticks);
return ticks;
}
@ -709,7 +719,7 @@ void CDROM::ExecuteCommand()
else
{
SendACKAndStat();
BeginSeeking();
BeginSeeking(false, false);
}
EndCommand();
@ -1020,9 +1030,7 @@ void CDROM::BeginReading(bool cdda)
if (m_setloc_pending)
{
BeginSeeking();
m_read_after_seek = !cdda;
m_play_after_seek = cdda;
BeginSeeking(!cdda, cdda);
return;
}
@ -1038,22 +1046,26 @@ void CDROM::BeginReading(bool cdda)
m_system->SetDowncount(m_drive_remaining_ticks);
}
void CDROM::BeginSeeking()
void CDROM::BeginSeeking(bool read_after_seek, bool play_after_seek)
{
if (!m_setloc_pending)
Log_WarningPrintf("Seeking without setloc set");
m_seek_position = m_setloc_position;
m_read_after_seek = read_after_seek;
m_play_after_seek = play_after_seek;
m_setloc_pending = false;
Log_DebugPrintf("Seeking to [%02u:%02u:%02u]", m_seek_position.minute, m_seek_position.second, m_seek_position.frame);
const TickCount seek_time = GetTicksForSeek();
m_secondary_status.ClearActiveBits();
m_secondary_status.motor_on = true;
m_sector_buffer.clear();
m_drive_state = DriveState::Seeking;
m_drive_remaining_ticks = GetTicksForSeek();
m_drive_remaining_ticks = seek_time;
m_system->SetDowncount(m_drive_remaining_ticks);
}

2
src/core/cdrom.h
View file

@ -207,7 +207,7 @@ private:
void ProcessDataSector(const u8* raw_sector);
void ProcessXAADPCMSector(const u8* raw_sector);
void ProcessCDDASector(const u8* raw_sector);
void BeginSeeking();
void BeginSeeking(bool read_after_seek, bool play_after_seek);
void LoadDataFIFO();
System* m_system = nullptr;