Initial community commit

Src/Plugins/Input/in_mp3/DXHEAD.C

@@ -0,0 +1,54 @@
+
+/*---- DXhead.c --------------------------------------------
+ 
+ 
+decoder MPEG Layer III
+ 
+handle Xing header
+ 
+mod 12/7/98 add vbr scale
+ 
+Copyright 1998 Xing Technology Corp.
+-----------------------------------------------------------*/
+#include <windows.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <float.h>
+#include <math.h>
+#include "dxhead.h" 
+
+
+/*-------------------------------------------------------------*/
+int SeekPoint(unsigned char TOC[100], int file_bytes, float percent)
+{
+	// interpolate in TOC to get file seek point in bytes
+	int a, seekpoint;
+	float fa, fb, fx;
+
+
+	if (percent < 0.0f)
+		percent = 0.0f;
+	if (percent > 100.0f)
+		percent = 100.0f;
+
+	a = (int)percent;
+	if (a > 99) a = 99;
+	fa = TOC[a];
+	if (a < 99)
+	{
+		fb = TOC[a + 1];
+	}
+	else
+	{
+		fb = 256.0f;
+	}
+
+
+	fx = fa + (fb - fa) * (percent - a);
+
+	seekpoint = (int) ((1.0f / 256.0f) * fx * file_bytes);
+
+
+	return seekpoint;
+}
+/*-------------------------------------------------------------*/