1 files changed, 130 insertions, 0 deletions
diff --git a/plugins/adplug/adplug/dro.cpp b/plugins/adplug/adplug/dro.cpp
new file mode 100644
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--- /dev/null
+++ b/plugins/adplug/adplug/dro.cpp
@@ -0,0 +1,130 @@
+/*
+ * Adplug - Replayer for many OPL2/OPL3 audio file formats.
+ * Copyright (C) 1999 - 2005 Simon Peter, <dn.tlp@gmx.net>, et al.
+ * 
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ * 
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * dro.c - DOSBox Raw OPL Player by Sjoerd van der Berg <harekiet@zophar.net>
+ *
+ * upgraded by matthew gambrell <zeromus@zeromus.org>
+ * 
+ * NOTES: 3-oct-04: the DRO format is not yet finalized. beware.
+ */
+
+#include <stdio.h>
+#include <string.h>
+
+#include "dro.h"
+
+/*** public methods *************************************/
+
+CPlayer *CdroPlayer::factory(Copl *newopl)
+{
+  return new CdroPlayer(newopl);
+}
+
+CdroPlayer::CdroPlayer(Copl *newopl)
+  : CPlayer(newopl), data(0)
+{
+  if(opl->gettype() == Copl::TYPE_OPL2)
+    opl3_mode = 0;
+  else
+    opl3_mode = 1;
+}
+
+bool CdroPlayer::load(const std::string &filename, const CFileProvider &fp)
+{
+  binistream *f = fp.open(filename); if(!f) return false;
+  char id[8];
+  unsigned long i;
+
+  // file validation section
+  f->readString(id, 8);
+  if(strncmp(id,"DBRAWOPL",8)) { fp.close (f); return false; }
+  int version = f->readInt(4);	// not very useful just yet
+  if(version != 0x10000) { fp.close(f); return false; }
+
+  // load section
+  mstotal = f->readInt(4);	// Total milliseconds in file
+  length = f->readInt(4);	// Total data bytes in file
+  f->ignore(1);			// Type of opl data this can contain - ignored
+  data = new unsigned char [length];
+  for (i=0;i<length;i++) 
+    data[i]=f->readInt(1);
+  fp.close(f);
+  rewind(0);
+  return true;
+}
+
+bool CdroPlayer::update()
+{
+  if (delay>500) {
+    delay-=500;
+    return true;
+  } else
+    delay=0;
+
+  while (pos < length) {
+    unsigned char cmd = data[pos++];
+    switch(cmd) {
+    case 0: 
+      delay = 1 + data[pos++];
+      return true;
+    case 1: 
+      delay = 1 + data[pos] + (data[pos+1]<<8);
+      pos+=2;
+      return true;
+    case 2:
+      index = 0;
+      opl->setchip(0);
+      break;
+    case 3:
+      index = 1;
+      opl->setchip(1);
+      break;
+    default:
+      if(cmd==4) cmd = data[pos++]; //data override
+      if(index == 0 || opl3_mode)
+	opl->write(cmd,data[pos++]);
+      break;
+    }
+  }
+
+  return pos<length;
+}
+
+void CdroPlayer::rewind(int subsong)
+{
+  delay=1; 
+  pos = index = 0; 
+  opl->init(); 
+
+  //dro assumes all registers are initialized to 0
+  //registers not initialized to 0 will be corrected
+  //in the data stream
+  for(int i=0;i<256;i++)
+    opl->write(i,0);
+	
+  opl->setchip(1);
+  for(int i=0;i<256;i++)
+    opl->write(i,0);
+  opl->setchip(0);
+}
+
+float CdroPlayer::getrefresh()
+{
+  if (delay > 500) return 1000 / 500;
+  else return 1000 / (double)delay;
+}