CDROM: Implement GetTN command

src/common/cd_image.cpp

@@ -24,7 +24,7 @@ std::unique_ptr<CDImage> CDImage::Open(const char* filename)
 
   if (CASE_COMPARE(extension, ".cue") == 0)
     return OpenCueSheetImage(filename);
-  else if (CASE_COMPARE(extension, ".bin") == 0)
+  else if (CASE_COMPARE(extension, ".bin") == 0 || CASE_COMPARE(extension, ".img") == 0)
     return OpenBinImage(filename);
 
 #undef CASE_COMPARE

src/common/cd_image.h

@@ -90,7 +90,9 @@ public:
   LBA GetPositionInTrack() const { return m_position_in_track; }
   Position GetMSFPositionInTrack() const { return Position::FromLBA(m_position_in_track); }
   LBA GetLBACount() const { return m_lba_count; }
+  u32 GetIndexNumber() const { return m_current_index->index_number; }
   u32 GetTrackNumber() const { return m_current_index->track_number; }
+  u32 GetTrackCount() const { return static_cast<u32>(m_tracks.size()); }
 
   // Seek to data LBA.
   bool Seek(LBA lba);
@@ -120,6 +122,7 @@ protected:
     u32 file_sector_size;
     LBA start_lba_on_disc;
     u32 track_number;
+    u32 index_number;
     LBA start_lba_in_track;
     u32 length;
     bool is_pregap;

src/common/cd_image_bin.cpp

@@ -48,6 +48,7 @@ bool CDImageBin::Open(const char* filename)
   pregap_index.start_lba_in_track = static_cast<LBA>(-static_cast<s32>(pregap_frames));
   pregap_index.length = pregap_frames;
   pregap_index.track_number = 1;
+  pregap_index.index_number = 0;
   pregap_index.is_pregap = true;
   m_indices.push_back(pregap_index);
 
@@ -58,6 +59,7 @@ bool CDImageBin::Open(const char* filename)
   data_index.file_sector_size = track_sector_size;
   data_index.start_lba_on_disc = pregap_index.length;
   data_index.track_number = 1;
+  data_index.index_number = 1;
   data_index.start_lba_in_track = 0;
   data_index.length = m_lba_count;
   m_indices.push_back(data_index);

src/common/cd_image_cuesheet.cpp

@@ -118,6 +118,7 @@ bool CDImageCueSheet::OpenAndParse(const char* filename)
       pregap_index.start_lba_in_track = static_cast<LBA>(static_cast<unsigned long>(-pregap_frames));
       pregap_index.length = pregap_frames;
       pregap_index.track_number = track_num;
+      pregap_index.index_number = 0;
       pregap_index.is_pregap = true;
       m_indices.push_back(pregap_index);
 
@@ -132,6 +133,7 @@ bool CDImageCueSheet::OpenAndParse(const char* filename)
     Index last_index;
     last_index.start_lba_on_disc = disc_lba;
     last_index.track_number = track_num;
+    last_index.index_number = 1;
     last_index.file = it->second;
     last_index.file_sector_size = track_sector_size;
     last_index.file_offset = 0;
@@ -156,6 +158,7 @@ bool CDImageCueSheet::OpenAndParse(const char* filename)
       }
 
       last_index.file_offset = index_offset * last_index.file_sector_size;
+      last_index.index_number = static_cast<u32>(index_num);
       last_index_offset = index_offset;
     }
 

src/core/cdrom.cpp

@@ -407,6 +407,13 @@ void CDROM::PushStatResponse(Interrupt interrupt /*= Interrupt::ACK*/)
   SetInterrupt(interrupt);
 }
 
+void CDROM::SendErrorResponse(u8 reason /*= 0x80*/)
+{
+  m_response_fifo.Push(m_secondary_status.bits | 0x01);
+  m_response_fifo.Push(reason);
+  SetInterrupt(Interrupt::INT5);
+}
+
 void CDROM::UpdateStatusRegister()
 {
   m_status.ADPBUSY = false;
@@ -755,6 +762,25 @@ void CDROM::ExecuteCommand()
     }
     break;
 
+    case Command::GetTN:
+    {
+      Log_DebugPrintf("CDROM GetTN command");
+      if (m_media)
+      {
+        m_response_fifo.Push(m_secondary_status.bits);
+        m_response_fifo.Push(DecimalToBCD(Truncate8(m_media->GetTrackNumber())));
+        m_response_fifo.Push(DecimalToBCD(Truncate8(m_media->GetTrackCount())));
+        SetInterrupt(Interrupt::ACK);
+      }
+      else
+      {
+        SendErrorResponse(0x80);
+      }
+
+      EndCommand();
+    }
+    break;
+
     default:
       Panic("Unknown command");
       break;

src/core/cdrom.h

@@ -170,6 +170,7 @@ private:
   bool HasPendingInterrupt() const { return m_interrupt_flag_register != 0; }
   void SetInterrupt(Interrupt interrupt);
   void PushStatResponse(Interrupt interrupt = Interrupt::ACK);
+  void SendErrorResponse(u8 reason = 0x80);
   void UpdateStatusRegister();
 
   u32 GetAckDelayForCommand() const;