Merge pull request #5 from WinampDesktop/community

Merge to main

1 files changed, 48 insertions, 0 deletions

diff --git a/Src/Plugins/Input/in_midi/cmf.cpp b/Src/Plugins/Input/in_midi/cmf.cpp
new file mode 100644
index 00000000..0eb4f552
--- /dev/null
+++ b/Src/Plugins/Input/in_midi/cmf.cpp
@@ -0,0 +1,48 @@
+#include "main.h"
+#include "cvt.h"
+
+bool is_cmf(const BYTE* buf,size_t s)
+{
+	return s>0x20 && *(DWORD*)buf == _rv('CTMF');
+}
+
+static BYTE tempodat[7]={0,0xFF,0x51,0x03,0,0,0};
+
+bool load_cmf(MIDI_file * mf,const BYTE* ptr,size_t sz)
+{
+	if (sz < 14)
+		return 0;
+
+	WORD music_offset = *(WORD*)(ptr+8);
+	if ((size_t)music_offset > sz)
+		return 0;
+	const BYTE* _t=ptr+music_offset;
+	size_t total_size=sz - music_offset;
+	mf->size=14+8+7+total_size;
+	BYTE* _pt=(BYTE*)malloc(mf->size);
+	if (!_pt) return 0;
+
+	mf->data=_pt;
+	*(DWORD*)_pt=_rv('MThd');
+	_pt+=4;
+	*(DWORD*)_pt=_rv(6);
+	_pt+=4;
+	*(WORD*)_pt=0;
+	_pt+=2;
+	*(WORD*)_pt=0x0100;
+	_pt+=2;
+	*(WORD*)_pt=rev16(*(WORD*)(ptr+10));
+	_pt+=2;
+	*(DWORD*)_pt=_rv('MTrk');
+	_pt+=4;
+	*(DWORD*)_pt=rev32(total_size+7);
+	_pt+=4;
+	DWORD tm=(DWORD)(48000000/(*(WORD*)(ptr+12)));
+	tempodat[4]=(BYTE)((tm>>16)&0xFF);
+	tempodat[5]=(BYTE)((tm>>8)&0xFF);
+	tempodat[6]=(BYTE)(tm&0xFF);
+	memcpy(_pt,tempodat,7);
+	_pt+=7;
+	memcpy(_pt,_t,total_size);
+	return 1;
+}
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