mirror of
https://github.com/WinampDesktop/winamp.git
synced 2024-09-24 15:54:12 +00:00
43 lines
1.3 KiB
C
43 lines
1.3 KiB
C
/*---- 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)
|
|
|
|
|
|
|
|
|