f05dc678f0
which included commits to RCS files with non-trunk default branches.
737 lines
18 KiB
Plaintext
737 lines
18 KiB
Plaintext
/*
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* $Source: /cvs/cvsroot/d2x/unused/bios/rbaudio.new,v $
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* $Revision: 1.1.1.2 $
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* $Author: bradleyb $
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* $Date: 2001-01-19 03:33:50 $
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*
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* Redbook Audio Library
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*
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* $Log: not supported by cvs2svn $
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* Revision 1.18 1996/04/15 15:27:40 samir
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* Play multiple tracks and PeekPlayStatus uses timer method!
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*
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* Revision 1.17 1996/04/12 20:08:42 samir
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* Added debugging info and Redbook / HSG detection
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*
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* Revision 1.16 1996/04/12 19:13:29 matt
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* Changed parameter name and added comments
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*
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* Revision 1.15 1996/04/12 18:08:02 samir
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* We now pass a cd drive letter to RBAInit.
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*
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* Revision 1.14 1996/02/14 13:31:29 samir
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* Fixed stupid bug that caused last track to never be played
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*
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* Revision 1.13 1996/02/13 17:16:04 samir
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* Added Pause and Resume Caps.
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*
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* Revision 1.12 1996/01/11 10:08:01 matt
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* RBARegisterCD wasn't checking SendRequest error code, so it was reporting
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* CD tracks when there was no CD in the drive.
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*
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* Revision 1.11 1996/01/10 20:15:45 samir
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* Changed behavior of RBACheckMediaChange to work
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* correctly, as well as calling this function in critical
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* RBA functions to take care of CD changes.
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*
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* Revision 1.10 1996/01/10 18:30:49 samir
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* Changed property of RBCheckMediaChange which would
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* not disable RBA if media had changed. GetNumberOfTracks
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* returns num. of tracks or if media changed, re-registers
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* CD and then returns number of tracks. If media has changed
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* RBAPlayTrack will return an error.
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*
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* Revision 1.9 1995/08/01 19:30:11 samir
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* Added ability to get number of tracks on CD via call.
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*
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* Revision 1.8 1995/07/20 16:13:56 samir
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* Doesn't quit if CD isn't Redbook.
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*
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* Revision 1.7 1995/05/10 11:37:51 samir
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* Checks whether CD-ROM in drive at start of game
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*
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* Revision 1.6 1995/05/09 18:00:08 samir
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* Error cleaned.
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*
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* Revision 1.5 1995/05/09 17:57:43 samir
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* No CD in Drive, then diable RBA
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*
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* Revision 1.4 1995/05/09 17:12:24 samir
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* Added user detection of Redbook Audio.
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*
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* Revision 1.3 1995/05/09 12:04:57 samir
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* Added ability to known when a CD is playing
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* and when it's stopped.
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*
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* Revision 1.2 1995/05/08 11:33:37 samir
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* Initial revision
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*
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*
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*/
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char rbaudio_rcsid[] = "$Id: rbaudio.new,v 1.1.1.2 2001-01-19 03:33:50 bradleyb Exp $";
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#include <dos.h>
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#include <dpmi.h>
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#include <string.h>
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#include "mono.h"
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#include "error.h"
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#include "rbaudio.h"
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#include "fix.h"
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#include "timer.h"
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#define HSG_CD_PLAYBACK 0
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#define MSF_CD_PLAYBACK 1
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#define RBERR_WRITEPROTVIOL 0
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#define RBERR_UNKNOWNUNIT 1
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#define RBERR_DRIVENOTREADY 2
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#define RBERR_UNKNOWNCOMMAND 3
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#define RBERR_CRCERROR 4
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#define RBERR_BADDRIVEREQ 5
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#define RBERR_SEEKERROR 6
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#define RBERR_UNKNOWNMEDIA 7
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#define RBERR_SECTORNOTFOUND 8
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#define RBERR_WRITEFAULT 10
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#define RBERR_READFAULT 12
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#define RBERR_GENERALFAILURE 13
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#define RBERR_BADDISKCHANGE 15
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#define RBSTAT_ERROR 0x8000
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#define RBSTAT_BUSY 0x0200
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#define RBSTAT_DONE 0x0100
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#pragma pack(1)
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// Request Header -----------------------------------------------------
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typedef struct _REQHDR {
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unsigned char length;
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unsigned char subunit;
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unsigned char func;
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unsigned short status;
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char array[8];
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} REQHDR;
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typedef struct _IOCTL {
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char bpb;
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unsigned short buffer_realoff;
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unsigned short buffer_realseg;
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unsigned short xferlen;
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unsigned short sector;
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unsigned long id;
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} IOCTL;
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// CD Information -----------------------------------------------------
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static struct {
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char code; // Control Block Code
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char track; // Track Number
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long start; // Start of Track in MSF (Redbook)
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unsigned char info; // Track Control Info
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} CDTrackInfo = {11,2,0L,0};
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static struct {
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REQHDR reqheader;
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IOCTL ioctl;
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} TrackInfoREQ = {{13,0,3,0,""}, {0,0,0,0,0}};
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static struct {
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unsigned char code;
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unsigned long devstat;
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} DevStat = {6,0};
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static struct {
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REQHDR reqhdr;
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IOCTL ioctl;
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} DevStatREQ = {{13,0,3,0,""}, {0,0,0,0,0}};
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static struct {
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unsigned char code;
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char byte;
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} MedChg = {9,0};
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static struct {
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REQHDR reqhdr;
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IOCTL ioctl;
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} MedChgREQ = {{13,0,3,0,""}, {0,0,0,0,0}};
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static struct {
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REQHDR reqhdr;
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} StopREQ = {{13,0,133,0,""}};
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static struct {
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REQHDR reqhdr;
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} ResumeREQ = {{13,0,136,0,""}};
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static struct {
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unsigned char code;
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unsigned char first;
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unsigned char last;
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unsigned long lead_out;
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} CDInfo = {10,0,0,0L};
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static struct {
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REQHDR reqhdr;
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IOCTL ioctl;
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} CDInfoREQ = {{13,0,3,0,""},{0,0,0,0,0}};
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static struct {
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REQHDR reqheader;
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char mode; // Play in HSG or MSF(RedBook)
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unsigned long playbeg;
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unsigned long playlen; // HSG Format
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char empty; // Empty byte used so that all requests have same size
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} PlayREQ = {{13,0,132,0,""},0,0,0,0};
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static struct {
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unsigned char code;
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unsigned char out0in;
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unsigned char out0vol;
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unsigned char out1in;
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unsigned char out1vol;
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unsigned char out2in;
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unsigned char out2vol;
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unsigned char out3in;
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unsigned char out3vol;
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} AUDChannelCtl = {3,0,0,0,0,0,0,0,0};
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static struct {
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REQHDR reqhdr;
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IOCTL ioctl;
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} AUDChannelCtlREQ = {{13,0,12,0,""},{0,0,0,0,0}};
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static struct {
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unsigned char code;
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unsigned char out0in;
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unsigned char out0vol;
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unsigned char out1in;
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unsigned char out1vol;
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unsigned char out2in;
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unsigned char out2vol;
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unsigned char out3in;
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unsigned char out3vol;
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} AUDChannelInfo = {4,0,0,0,0,0,0,0,0};
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static struct {
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REQHDR reqhdr;
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IOCTL ioctl;
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} AUDChannelInfoREQ = {{13,0,3,0,""},{0,0,0,0,0}};
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static struct {
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unsigned char code;
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unsigned char mode;
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unsigned long headloc;
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} HeadInfo = {1,MSF_CD_PLAYBACK,0L};
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static struct {
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REQHDR reqhdr;
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IOCTL ioctl;
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} HeadInfoREQ = {{13,0,3,0,""},{0,0,0,0,0}};
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//@@static struct {
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//@@ ubyte code;
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//@@ ubyte adr;
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//@@ ubyte tno;
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//@@ ubyte point;
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//@@ ubyte min;
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//@@ ubyte sec;
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//@@ ubyte frame;
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//@@ ubyte zero;
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//@@ ubyte pmin;
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//@@ ubyte psec;
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//@@ ubyte pframe;
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//@@} QChannelInfo = {12, MSF_CD_PLAYBACK, 2,0,0,0,0,0,0,0,0 };
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//@@
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//@@static struct {
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//@@ REQHDR reqhdr;
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//@@ IOCTL ioctl;
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//@@} QChannelInfoREQ = {{13, 0, 3, 0, ""}, {0,0,0,0,0}};
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// Translation from RealMode->Protected mode buffer
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typedef struct _REQ_xlatbuf { // Buffer for Real Mode Callback
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REQHDR reqheader;
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char ioctl[10];
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} REQ_xlatbuf;
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// Other Data ---------------------------------------------------------
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static unsigned char CDDriveLetter;
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static unsigned long CDNumTracks,CDTrackStart[101];
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static int RedBookEnabled = 0;
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static int RedBookPlaybackType = MSF_CD_PLAYBACK;
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static fix Playback_Start_Time = 0;
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static fix Playback_Pause_Time = 0;
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static fix Playback_Length = 0;
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// Prototypes ---------------------------------------------------------
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int RBSendRequest(char *request, char *xferptr, int xferlen);
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unsigned long msf_to_lsn(unsigned long msf);
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unsigned long lsn_to_msf(unsigned long lsn);
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// --------------------------------------------------------------------
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void RBAInit(ubyte cd_drive_num) //drive a == 0, drive b == 1
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{
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union REGS regs;
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// Detect presence of CD-ROM
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regs.x.eax = 0x1500;
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regs.x.ebx = 0;
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int386(0x2f, ®s, ®s);
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if (regs.x.ebx == 0)
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RBADisable(); // Disable RedBook
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// Error("RBA Error: MSCDEX.EXE compatible driver couldn't be found.");
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else {
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CDDriveLetter = cd_drive_num;
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// CDDriveLetter = (unsigned char)regs.x.ecx;
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RBAEnable();
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RBACheckMediaChange();
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RBSendRequest((char*)&DevStatREQ, (char*)&DevStat, sizeof(DevStat));
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// If Door drive open, or no disc in CD-ROM, then Redbook is Disabled.
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if ((DevStat.devstat&2048) || (DevStat.devstat&1) || RBAEnabled() == 0)
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RBADisable();
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//@@ if (DevStat.devstat&4)
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//@@ mprintf((0, "supports cooked and raw reading.\n"));
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//@@ else
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//@@ mprintf((0, "supports only cooked reading.\n"));
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//@@
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//@@ if (DevStat.devstat&256)
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//@@ mprintf((0, "audio channel manipulation.\n"));
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//@@ else
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//@@ mprintf((0, "no audio channel manipulation.\n"));
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if (DevStat.devstat&512) {
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// RedBookPlaybackType = MSF_CD_PLAYBACK;
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mprintf((0, "supports HSG and RedBook addressing mode.\n"));
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}
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else {
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// RedBookPlaybackType = HSG_CD_PLAYBACK;
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mprintf((0, "supports HSG addressing only.\n"));
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}
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RedBookPlaybackType = MSF_CD_PLAYBACK;
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}
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}
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//find out how many tracks on the CD, and their starting locations
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void RBARegisterCD(void)
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{
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int i;
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int error;
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// Get CD Information First
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RBACheckMediaChange();
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error = RBSendRequest((char*)&CDInfoREQ, (char*)&CDInfo, sizeof(CDInfo));
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if (error & RBSTAT_ERROR) { //error!
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CDNumTracks = 0;
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return;
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}
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CDNumTracks = (CDInfo.last-CDInfo.first)+1;
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// Define Track Starts
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for (i=CDInfo.first; i<=CDNumTracks; i++)
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{
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CDTrackInfo.track = i;
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RBSendRequest((char *)&TrackInfoREQ, (char*)&CDTrackInfo, sizeof(CDTrackInfo));
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CDTrackStart[i] = CDTrackInfo.start;
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}
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CDTrackStart[i] = CDInfo.lead_out;
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}
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long RBAGetDeviceStatus()
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{
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RBSendRequest((char*)&DevStatREQ, (char*)&DevStat, sizeof(DevStat));
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return (long)DevStat.devstat;
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}
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int RBAGetNumberOfTracks(void)
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{
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// Get CD Information
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if (RBACheckMediaChange())
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RBARegisterCD();
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return CDNumTracks;
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}
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int RBAPlayTrack(int track)
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{
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unsigned long playlen;
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int min, sec;
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Playback_Start_Time = 0;
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Playback_Length = 0;
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if (track < CDInfo.first || track > CDInfo.last) {
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mprintf((0,"CD not Redbook Compatible. Will not play track.\n"));
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}
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// Error("RBA Error: Track %d doesn't exist on CD!!!", track);
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if (RBACheckMediaChange()) {
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mprintf((0, "Unable to play track due to CD change.\n"));
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return 0;
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}
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// Play the track now!!!
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PlayREQ.mode = RedBookPlaybackType;
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PlayREQ.playbeg = CDTrackStart[track];
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if (RedBookPlaybackType == MSF_CD_PLAYBACK) {
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PlayREQ.playlen =
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msf_to_lsn(CDTrackStart[track+1]) - msf_to_lsn(CDTrackStart[track]);
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}
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else {
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mprintf((1, "RBERR: No! No! No! This shouldn't happen (HSG_CD_PLAYBACK).\n"));
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Int3();
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PlayREQ.playlen = CDTrackStart[track+1] - CDTrackStart[track];
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}
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RBSendRequest((char *)&PlayREQ,NULL,0);
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playlen = msf_to_lsn(CDTrackStart[track+1]) - msf_to_lsn(CDTrackStart[track]);
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playlen = lsn_to_msf(playlen);
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min = (int)((playlen >> 16) & 0xFF);
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sec = (int)((playlen >> 8) & 0xFF);
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Playback_Start_Time = timer_get_fixed_seconds();
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Playback_Length = i2f(min*60+sec);
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mprintf( (0,"Playing Track %d (len: %d secs)\n", track, min*60+sec) );
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return 1;
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}
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//plays tracks first through last, inclusive
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int RBAPlayTracks(int first, int last)
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{
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unsigned long playlen;
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int min, sec;
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Playback_Start_Time = 0;
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Playback_Length = 0;
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if (first < CDInfo.first || last > CDInfo.last) {
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mprintf((0,"Invalid start or end track.\n"));
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}
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// Error("RBA Error: Track %d doesn't exist on CD!!!", track);
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if (RBACheckMediaChange()) {
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mprintf((0, "Unable to play track due to CD change.\n"));
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return 0;
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}
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// Play the track now!!!
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PlayREQ.mode = RedBookPlaybackType;
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PlayREQ.playbeg = CDTrackStart[first];
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if (RedBookPlaybackType == MSF_CD_PLAYBACK) {
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PlayREQ.playlen =
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msf_to_lsn(CDTrackStart[last+1]) - msf_to_lsn(CDTrackStart[first]);
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}
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else {
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mprintf((1, "RBERR: No! No! No! This shouldn't happen (HSG_CD_PLAYBACK).\n"));
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Int3();
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PlayREQ.playlen = CDTrackStart[last+1] - CDTrackStart[first];
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}
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RBSendRequest((char *)&PlayREQ,NULL,0);
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playlen = msf_to_lsn(CDTrackStart[last+1]) - msf_to_lsn(CDTrackStart[first]);
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playlen = lsn_to_msf(playlen);
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min = (int)((playlen >> 16) & 0xFF);
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sec = (int)((playlen >> 8) & 0xFF);
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Playback_Start_Time = timer_get_fixed_seconds();
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Playback_Length = i2f(min*60+sec);
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mprintf( (0,"Playing Tracks %d-%d (len: %d secs)\n", first,last,min*60+sec) );
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return 1;
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}
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void RBAPause()
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{
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RBSendRequest((char *)&StopREQ, NULL, 0);
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Playback_Pause_Time = timer_get_fixed_seconds();
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}
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int RBAResume()
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{
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if (RBACheckMediaChange()) {
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RBARegisterCD();
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return RBA_MEDIA_CHANGED;
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}
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RBSendRequest((char *)&ResumeREQ, NULL, 0);
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Playback_Start_Time += timer_get_fixed_seconds() - Playback_Pause_Time;
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return 1;
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}
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void RBAStop()
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{
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if (RBACheckMediaChange())
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RBARegisterCD();
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RBSendRequest((char *)&StopREQ,NULL,0);
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}
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void RBASetStereoAudio(RBACHANNELCTL *channels)
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{
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AUDChannelCtl.out0in = channels->out0in;
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AUDChannelCtl.out0vol = channels->out0vol;
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AUDChannelCtl.out1in = channels->out1in;
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AUDChannelCtl.out1vol = channels->out1vol;
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AUDChannelCtl.out2in = AUDChannelCtl.out2vol = 0;
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AUDChannelCtl.out3in = AUDChannelCtl.out3vol = 0;
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RBSendRequest((char*)&AUDChannelCtlREQ, (char*)&AUDChannelCtl, sizeof(AUDChannelCtl));
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}
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void RBASetQuadAudio(RBACHANNELCTL *channels)
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{
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AUDChannelCtl.out0in = (unsigned char)channels->out0in;
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AUDChannelCtl.out0vol = (unsigned char)channels->out0vol;
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AUDChannelCtl.out1in = (unsigned char)channels->out1in;
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AUDChannelCtl.out1vol = (unsigned char)channels->out1vol;
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AUDChannelCtl.out2in = (unsigned char)channels->out2in;
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AUDChannelCtl.out2vol = (unsigned char)channels->out2vol;
|
|
AUDChannelCtl.out3in = (unsigned char)channels->out3in;
|
|
AUDChannelCtl.out3vol = (unsigned char)channels->out3vol;
|
|
|
|
RBSendRequest((char*)&AUDChannelCtlREQ, (char*)&AUDChannelCtl, sizeof(AUDChannelCtl));
|
|
}
|
|
|
|
|
|
void RBAGetAudioInfo(RBACHANNELCTL *channels)
|
|
{
|
|
RBSendRequest((char*)&AUDChannelInfoREQ, (char*)&AUDChannelInfo, sizeof(AUDChannelInfo));
|
|
|
|
channels->out0in = (int)AUDChannelInfo.out0in;
|
|
channels->out0vol = (int)AUDChannelInfo.out0vol;
|
|
channels->out1in = (int)AUDChannelInfo.out1in;
|
|
channels->out1vol = (int)AUDChannelInfo.out1vol;
|
|
channels->out2in = (int)AUDChannelInfo.out2in;
|
|
channels->out2vol = (int)AUDChannelInfo.out2vol;
|
|
channels->out3in = (int)AUDChannelInfo.out3in;
|
|
channels->out3vol = (int)AUDChannelInfo.out3vol;
|
|
|
|
}
|
|
|
|
|
|
void RBASetChannelVolume(int channel, int volume)
|
|
{
|
|
//RBACHANNELCTL channels;
|
|
|
|
RBSendRequest((char*)&AUDChannelInfoREQ, (char*)&AUDChannelInfo, sizeof(AUDChannelInfo));
|
|
|
|
AUDChannelCtl.out0in = AUDChannelInfo.out0in;
|
|
AUDChannelCtl.out0vol = AUDChannelInfo.out0vol;
|
|
AUDChannelCtl.out1in = AUDChannelInfo.out1in;
|
|
AUDChannelCtl.out1vol = AUDChannelInfo.out1vol;
|
|
AUDChannelCtl.out2in = AUDChannelInfo.out2in;
|
|
AUDChannelCtl.out2vol = AUDChannelInfo.out2vol;
|
|
AUDChannelCtl.out3in = AUDChannelInfo.out3in;
|
|
AUDChannelCtl.out3vol = AUDChannelInfo.out3vol;
|
|
|
|
if (channel == 0) AUDChannelCtl.out0vol = (unsigned char)volume;
|
|
if (channel == 1) AUDChannelCtl.out1vol = (unsigned char)volume;
|
|
if (channel == 2) AUDChannelCtl.out2vol = (unsigned char)volume;
|
|
if (channel == 3) AUDChannelCtl.out3vol = (unsigned char)volume;
|
|
|
|
RBSendRequest((char*)&AUDChannelCtlREQ,(char*)&AUDChannelCtl, sizeof(AUDChannelCtl));
|
|
|
|
}
|
|
|
|
|
|
void RBASetVolume(int volume)
|
|
{
|
|
RBASetChannelVolume(0,volume);
|
|
RBASetChannelVolume(1,volume);
|
|
}
|
|
|
|
|
|
long RBAGetHeadLoc(int *min, int *sec, int *frame)
|
|
{
|
|
unsigned long loc;
|
|
|
|
if (RBACheckMediaChange())
|
|
return RBA_MEDIA_CHANGED;
|
|
|
|
HeadInfo.mode = RedBookPlaybackType;
|
|
RBSendRequest((char*)&HeadInfoREQ, (char*)&HeadInfo, sizeof(HeadInfo));
|
|
|
|
if (RedBookPlaybackType == MSF_CD_PLAYBACK)
|
|
loc = HeadInfo.headloc;
|
|
else
|
|
loc = lsn_to_msf(HeadInfo.headloc);
|
|
|
|
*min = (int)((loc >> 16) & 0xFF);
|
|
*sec = (int)((loc >> 8) & 0xFF);
|
|
*frame = (int)((loc >> 0) & 0xFF);
|
|
|
|
return loc;
|
|
}
|
|
|
|
|
|
int RBAPeekPlayStatus()
|
|
{
|
|
if ((timer_get_fixed_seconds()-Playback_Start_Time) > Playback_Length) return 0;
|
|
else return 1;
|
|
}
|
|
|
|
|
|
int RBAEnabled()
|
|
{
|
|
if (RedBookEnabled < 1) return 0;
|
|
else return 1;
|
|
}
|
|
|
|
|
|
void RBAEnable()
|
|
{
|
|
RedBookEnabled = 1;
|
|
mprintf((0, "Enabling Redbook...\n"));
|
|
}
|
|
|
|
|
|
void RBADisable()
|
|
{
|
|
RedBookEnabled = 0;
|
|
mprintf((0, "Disabling Redbook...\n"));
|
|
}
|
|
|
|
|
|
|
|
// RB functions: Internal to RBA library -----------------------------
|
|
|
|
//returns 1 if media has changed, else 0
|
|
int RBACheckMediaChange()
|
|
{
|
|
RBSendRequest((char *)&MedChgREQ, (char*)&MedChg, sizeof(MedChg));
|
|
|
|
if (MedChg.byte == 255 || MedChg.byte == 0) {
|
|
// New media in drive (or maybe no media in drive)
|
|
mprintf((0,"CD-ROM Media change detected\n"));
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
// Send Request
|
|
|
|
//returns 16-bit value. Bit 15 means error.
|
|
//WE NEED SYMBOLOIC CONSTANTS FOR ALL RETURN CODES & STATUS BITS
|
|
int RBSendRequest(char *request, char *xferptr, int xferlen)
|
|
{
|
|
//union REGS regs;
|
|
dpmi_real_regs rregs;
|
|
|
|
IOCTL *ioctl;
|
|
REQ_xlatbuf *xlat_req; // Translated Buffer Request
|
|
char *xlat_xferptr; // Translated Buffer Transfer Buffer Ptr
|
|
|
|
unsigned short status;
|
|
|
|
if (!RedBookEnabled) return 0; // Don't send request if no RBA
|
|
|
|
memset(&rregs,0,sizeof(dpmi_real_regs));
|
|
|
|
// Get Temporary Real Mode Buffer for request translation
|
|
xlat_req = (REQ_xlatbuf *)dpmi_get_temp_low_buffer(128+xferlen);
|
|
memcpy(xlat_req, request, sizeof(REQHDR)+sizeof(IOCTL));
|
|
ioctl = (IOCTL *)(((char*)xlat_req)+sizeof(REQHDR));
|
|
|
|
// Set Transfer Buffer in IOCTL reqion of 'request'
|
|
if (xferlen && xferptr) {
|
|
xlat_xferptr = ((char*)xlat_req) + 128;
|
|
memcpy(xlat_xferptr, xferptr, xferlen);
|
|
|
|
ioctl->buffer_realoff = DPMI_real_offset(xlat_xferptr);
|
|
ioctl->buffer_realseg = DPMI_real_segment(xlat_xferptr);
|
|
ioctl->xferlen = xferlen;
|
|
}
|
|
|
|
// Setup and Send Request Packet
|
|
rregs.eax = 0x1510;
|
|
rregs.ecx = (unsigned)(CDDriveLetter);
|
|
rregs.es = DPMI_real_segment(xlat_req);
|
|
rregs.ebx = DPMI_real_offset(xlat_req);
|
|
dpmi_real_int386x(0x2f, &rregs);
|
|
|
|
// Return Translate Buffer to Protected mode 'xferptr'
|
|
if (xferlen && xferptr) {
|
|
memcpy(xferptr, xlat_xferptr, xferlen);
|
|
}
|
|
memcpy(request, xlat_req, sizeof(REQHDR)+sizeof(IOCTL));
|
|
|
|
// Check for Errors.
|
|
status = ((REQHDR *)request)->status;
|
|
|
|
if (status & RBSTAT_ERROR) {
|
|
mprintf((0,"Error in SendRequest: %x.\n", status));
|
|
}
|
|
|
|
return status;
|
|
}
|
|
|
|
|
|
// Converts Logical Sector Number to Minutes Seconds Frame Format
|
|
|
|
unsigned long lsn_to_msf(unsigned long lsn)
|
|
{
|
|
unsigned long min,sec,frame;
|
|
lsn += 150;
|
|
|
|
min = lsn / (60*75);
|
|
lsn = lsn % (60*75);
|
|
sec = lsn / 75;
|
|
lsn = lsn % 75;
|
|
frame = lsn;
|
|
|
|
return((min << 16) + (sec << 8) + (frame << 0));
|
|
}
|
|
|
|
// convert minutes seconds frame format to a logical sector number.
|
|
|
|
unsigned long msf_to_lsn(unsigned long msf)
|
|
{
|
|
unsigned long min,sec,frame;
|
|
|
|
min = (msf >> 16) & 0xFF;
|
|
sec = (msf >> 8) & 0xFF;
|
|
frame = (msf >> 0) & 0xFF;
|
|
|
|
return( (min * 60*75) + (sec * 75) + frame - 150 );
|
|
}
|
|
|