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CDROM: Move pregap handling to image class

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This commit is contained in:
Connor McLaughlin 2019-09-26 00:15:06 +10:00
parent ba67f69c2a
commit 767e8f08e0
3 changed files with 13 additions and 9 deletions
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11
src/common/cd_image.cpp
View file

@ -11,14 +11,15 @@ CDImage::~CDImage()
m_data_file->Release(); m_data_file->Release();
} }
constexpr u64 CDImage::MSFToLBA(u32 minute, u32 second, u32 frame) constexpr u64 CDImage::MSFToLBA(u32 pregap_seconds, u32 minute, u32 second, u32 frame)
{ {
return ZeroExtend64(minute) * FRAMES_PER_MINUTE + ZeroExtend64(second) * FRAMES_PER_SECOND + ZeroExtend64(frame); return ZeroExtend64(minute) * FRAMES_PER_MINUTE + ZeroExtend64(second) * FRAMES_PER_SECOND + ZeroExtend64(frame) -
ZeroExtend64(pregap_seconds) * FRAMES_PER_SECOND;
} }
constexpr void CDImage::LBAToMSF(u64 lba, u32* minute, u32* second, u32* frame) constexpr void CDImage::LBAToMSF(u32 pregap_seconds, u64 lba, u32* minute, u32* second, u32* frame)
{ {
const u32 offset = lba % FRAMES_PER_MINUTE; const u64 offset = (lba + (pregap_seconds * FRAMES_PER_SECOND) % FRAMES_PER_MINUTE);
*minute = Truncate32(lba / FRAMES_PER_MINUTE); *minute = Truncate32(lba / FRAMES_PER_MINUTE);
*second = Truncate32(offset / FRAMES_PER_SECOND); *second = Truncate32(offset / FRAMES_PER_SECOND);
*frame = Truncate32(offset % FRAMES_PER_SECOND); *frame = Truncate32(offset % FRAMES_PER_SECOND);
@ -52,7 +53,7 @@ bool CDImage::Seek(u64 lba)
bool CDImage::Seek(u32 minute, u32 second, u32 frame) bool CDImage::Seek(u32 minute, u32 second, u32 frame)
{ {
return Seek(MSFToLBA(minute, second, frame)); return Seek(MSFToLBA(m_pregap_seconds, minute, second, frame));
} }
u32 CDImage::Read(ReadMode read_mode, u64 lba, u32 sector_count, void* buffer) u32 CDImage::Read(ReadMode read_mode, u64 lba, u32 sector_count, void* buffer)

7
src/common/cd_image.h
View file

@ -27,8 +27,8 @@ public:
}; };
// Conversion helpers. // Conversion helpers.
static constexpr u64 MSFToLBA(u32 minute, u32 second, u32 frame); static constexpr u64 MSFToLBA(u32 pregap_seconds, u32 minute, u32 second, u32 frame);
static constexpr void LBAToMSF(u64 lba, u32* minute, u32* second, u32* frame); static constexpr void LBAToMSF(u32 pregap_seconds, u64 lba, u32* minute, u32* second, u32* frame);
// Accessors. // Accessors.
u64 GetCurrentLBA() const { return m_current_lba; } u64 GetCurrentLBA() const { return m_current_lba; }
@ -53,6 +53,9 @@ private:
// TODO: Multiple data files from cue sheet // TODO: Multiple data files from cue sheet
ByteStream* m_data_file = nullptr; ByteStream* m_data_file = nullptr;
// Pregap size.
u32 m_pregap_seconds = 2;
// Current LBA/total LBAs. // Current LBA/total LBAs.
u64 m_current_lba = 0; u64 m_current_lba = 0;
u64 m_lba_count = 0; u64 m_lba_count = 0;

4
src/pse/cdrom.cpp
View file

@ -565,7 +565,7 @@ void CDROM::ExecuteCommand()
{ {
Assert(m_setloc_dirty); Assert(m_setloc_dirty);
StopReading(); StopReading();
if (!m_media || !m_media->Seek(m_setloc.minute, m_setloc.second - 2 /* pregap */, m_setloc.frame)) if (!m_media || !m_media->Seek(m_setloc.minute, m_setloc.second, m_setloc.frame))
{ {
Panic("Error in Setloc command"); Panic("Error in Setloc command");
return; return;
@ -619,7 +619,7 @@ void CDROM::ExecuteCommand()
// TODO: Seek timing and clean up... // TODO: Seek timing and clean up...
if (m_setloc_dirty) if (m_setloc_dirty)
{ {
if (!m_media || !m_media->Seek(m_setloc.minute, m_setloc.second - 2 /* pregap */, m_setloc.frame)) if (!m_media || !m_media->Seek(m_setloc.minute, m_setloc.second, m_setloc.frame))
{ {
Panic("Seek error"); Panic("Seek error");
} }