1 files changed, 66 insertions, 0 deletions
diff --git a/mpeglib/lib/splay/dxHead.h b/mpeglib/lib/splay/dxHead.h
new file mode 100644
index 00000000..da0f2eff
--- /dev/null
+++ b/mpeglib/lib/splay/dxHead.h
@@ -0,0 +1,66 @@
+/*---- DXhead.h -------------------------------------------
+
+
+decoder MPEG Layer III
+
+handle Xing header
+
+
+Copyright 1998 Xing Technology Corp.
+-----------------------------------------------------------*/
+// A Xing header may be present in the ancillary
+// data field of the first frame of an mp3 bitstream
+// The Xing header (optionally) contains
+//      frames      total number of audio frames in the bitstream
+//      bytes       total number of bytes in the bitstream
+//      toc         table of contents
+
+// toc (table of contents^) gives seek points
+// for random access
+// the ith entry determines the seek point for
+// i-percent duration
+// seek point in bytes = (toc[i]/256.0) * total_bitstream_bytes
+// e.g. half duration seek point = (toc[50]/256.0) * total_bitstream_bytes
+
+#ifndef __DXHEAD_H
+#define __DXHEAD_H
+
+#define FRAMES_FLAG     0x0001
+#define BYTES_FLAG      0x0002
+#define TOC_FLAG        0x0004
+#define VBR_SCALE_FLAG  0x0008
+
+#define FRAMES_AND_BYTES (FRAMES_FLAG | BYTES_FLAG)
+
+// structure to receive extracted header
+// toc may be NULL
+
+typedef struct XHEADDATA_s {
+    int h_id;       // from MPEG header, 0=MPEG2, 1=MPEG1
+    int samprate;   // determined from MPEG header
+    int flags;      // from Xing header data
+    int frames;     // total bit stream frames from Xing header data
+    int bytes;      // total bit stream bytes from Xing header data
+    int vbr_scale;  // encoded vbr scale from Xing header data
+    unsigned char *toc;  // pointer to unsigned char toc_buffer[100]
+                         // may be NULL if toc not desired
+} XHEADDATA;
+
+int GetXingHeader(XHEADDATA *X,  unsigned char *buf);
+
+// return 0=fail, 1=success
+// X   structure to receive header data (output)
+// buf bitstream input 
+
+
+int SeekPoint(unsigned char TOC[100], int file_bytes, float percent);
+// return seekpoint in bytes (may be at eof if percent=100.0)
+// TOC = table of contents from Xing header
+// file_bytes = number of bytes in mp3 file
+// percent = play time percentage of total playtime. May be
+//           fractional (e.g. 87.245)
+
+
+#endif
+
+