1 files changed, 60 insertions, 0 deletions
diff --git a/src/libmpg123/dxhead.h b/src/libmpg123/dxhead.h
new file mode 100755
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--- /dev/null
+++ b/src/libmpg123/dxhead.h
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+/*---- 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
+ */ 
+
+#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
+{
+	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 mpg123_get_xing_header(XHEADDATA * X, unsigned char *buf);
+
+/* return 0=fail, 1=success
+ * X   structure to receive header data (output)
+ * buf bitstream input 
+ */ 
+
+int mpg123_seek_point(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)
+ */