1 files changed, 43 insertions, 0 deletions
diff --git a/Src/Plugins/Input/in_mp3/DXHEAD.H b/Src/Plugins/Input/in_mp3/DXHEAD.H
new file mode 100644
index 00000000..5b59e043
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+++ b/Src/Plugins/Input/in_mp3/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)
+
+
+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)
+
+
+
+