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authortoma <toma@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>2009-11-25 17:56:58 +0000
committertoma <toma@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>2009-11-25 17:56:58 +0000
commite2de64d6f1beb9e492daf5b886e19933c1fa41dd (patch)
tree9047cf9e6b5c43878d5bf82660adae77ceee097a /mpeglib/lib/splay/dxHead.h
downloadtdemultimedia-e2de64d6f1beb9e492daf5b886e19933c1fa41dd.tar.gz
tdemultimedia-e2de64d6f1beb9e492daf5b886e19933c1fa41dd.zip
Copy the KDE 3.5 branch to branches/trinity for new KDE 3.5 features.
BUG:215923 git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdemultimedia@1054174 283d02a7-25f6-0310-bc7c-ecb5cbfe19da
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diff --git a/mpeglib/lib/splay/dxHead.h b/mpeglib/lib/splay/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
+
+#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
+
+