ref: 0774dce204c2c01622c59819e2a29590a1b50e46
dir: /src/hexen/i_cdmus.c/
//**************************************************************************
//**
//** i_cdmus.c
//**
//**************************************************************************
// HEADER FILES ------------------------------------------------------------
#include <stdio.h>
#include <stdlib.h>
#include <dos.h>
#include <stddef.h>
#include <string.h>
#include "h2def.h"
#include "i_sound.h"
// MACROS ------------------------------------------------------------------
#define MAX_AUDIO_TRACKS 25
#define MULTIPLEX_INT 0x2f
#define CDROM_GETDRIVECOUNT 0x1500
#define CDROM_SENDDEVICEREQ 0x1510
#define CDROM_GETVERSION 0x150c
#define HSG_MODE 0
#define RED_MODE 1
#define DRC_IOCTLINPUT 0x03
#define DRC_IOCTLOUTPUT 0x0c
#define DRC_PLAYAUDIO 0x84
#define DRC_STOPAUDIO 0x85
#define DRC_RESUMEAUDIO 0x88
#define DPMI_INT 0x31
#define DPMI_ALLOCREALMEM 0x0100
#define DPMI_FREEREALMEM 0x0101
#define DPMI_SIMREALINT 0x0300
// IOCTL input commands
#define ADRDEVHEAD 0 // Return Address of Device Header
#define HEADLOCATION 1 // Location of Head
#define RESERVED 2 // Reserved
#define ERRSTATISTICS 3 // Error Statistics
#define AUDIOCHANINFO 4 // Audio Channel Info
#define READDRVBYTES 5 // Read Drive Bytes
#define DEVICESTATUS 6 // Device Status
#define GETSECTORSIZE 7 // Return Sector Size
#define GETVOLSIZE 8 // Return Volume Size
#define MEDIACHANGED 9 // Media Changed
#define AUDIODISKINFO 10 // Audio Disk Info
#define AUDIOTRACKINFO 11 // Audio Track Info
#define AUDIOQCHANINFO 12 // Audio Q-Channel Info
#define AUDIOSUBINFO 13 // Audio Sub-Channel Info
#define UPCCODE 14 // UPC Code
#define AUDIOSTATUSINFO 15 // Audio Status Info
// IOCTL output commands
#define EJECTDISK 0 // Eject Disk
#define DOORLOCK 1 // Lock/Unlock Door
#define RESETDRIVE 2 // Reset Drive
#define AUDIOCHANCONTROL 3 // Audio Channel Control
#define WRITEDEVCONTROL 4 // Write Device Control String
#define CLOSETRAY 5 // Close Tray
// TYPES -------------------------------------------------------------------
typedef signed char S_BYTE;
typedef unsigned char U_BYTE;
typedef signed short S_WORD;
typedef unsigned short U_WORD;
typedef signed int S_LONG;
typedef unsigned int U_LONG;
typedef struct {
U_LONG size;
void **address;
U_WORD *segment;
U_WORD *selector;
} DOSChunk_t;
typedef struct {
U_LONG edi;
U_LONG esi;
U_LONG ebp;
U_LONG reserved;
U_LONG ebx;
U_LONG edx;
U_LONG ecx;
U_LONG eax;
U_WORD flags;
U_WORD es;
U_WORD ds;
U_WORD fs;
U_WORD gs;
U_WORD ip;
U_WORD cs;
U_WORD sp;
U_WORD ss;
} RegBlock_t;
typedef struct {
short lengthMin;
short lengthSec;
int redStart;
int sectorStart;
int sectorLength;
} AudioTrack_t;
// EXTERNAL FUNCTION PROTOTYPES --------------------------------------------
// PUBLIC FUNCTION PROTOTYPES ----------------------------------------------
// PRIVATE FUNCTION PROTOTYPES ---------------------------------------------
static U_WORD InputIOCTL(S_WORD request, U_LONG pctrlblk);
static U_WORD OutputIOCTL(S_WORD request, U_LONG pctrlblk);
static U_LONG RedToSectors(U_LONG red);
static int AllocIOCTLBuffers(void);
static void DPMI_SimRealInt(U_LONG intr, RegBlock_t *rBlock);
static void *DPMI_AllocRealMem(U_LONG size, U_WORD *segment,
U_WORD *selector);
static void DPMI_FreeRealMem(U_WORD selector);
// EXTERNAL DATA DECLARATIONS ----------------------------------------------
// PUBLIC DATA DEFINITIONS -------------------------------------------------
int cd_Error;
// PRIVATE DATA DEFINITIONS ------------------------------------------------
static int cd_DriveCount;
static int cd_FirstDrive;
static int cd_CurDrive;
static U_WORD cd_Version;
static int cd_FirstTrack;
static int cd_LastTrack;
static int cd_TrackCount;
static U_WORD cd_LeadOutMin;
static U_WORD cd_LeadOutSec;
static U_LONG cd_LeadOutRed;
static U_LONG cd_LeadOutSector;
static U_LONG cd_IOCTLBufferTotal;
static AudioTrack_t cd_AudioTracks[MAX_AUDIO_TRACKS];
static int OkInit = 0;
static RegBlock_t RegBlock;
static struct PlayReq_s { // CD-ROM Play Audio Device Request Struct
U_BYTE headerSize;
U_BYTE subUnitCode;
U_BYTE command; // = DRC_PLAYAUDIO
U_WORD status;
U_BYTE reserved[8];
U_BYTE addressMode;
U_LONG startSector;
U_LONG numberToRead;
} *cd_PlayReq;
static U_WORD cd_PlayReqSeg;
static U_WORD cd_PlayReqSel;
static struct StopReq_s { // CD-ROM Stop Audio Device Request Struct
U_BYTE headerSize;
U_BYTE subUnitCode;
U_BYTE command; // = DRC_STOPAUDIO
U_WORD status;
U_BYTE reserved[8];
} *cd_StopReq;
static U_WORD cd_StopReqSeg;
static U_WORD cd_StopReqSel;
static struct ResumeReq_s { // CD-ROM Resume Audio Device Request Struct
U_BYTE headerSize;
U_BYTE subUnitCode;
U_BYTE command; // = DRC_RESUMEAUDIO
U_WORD status;
U_BYTE reserved[8];
} *cd_ResumeReq;
static U_WORD cd_ResumeReqSeg;
static U_WORD cd_ResumeReqSel;
// IOCTL Input command data buffer structures
static struct IOCTLIn_s { // IOCTL Input Struct
U_BYTE headerSize;
U_BYTE subUnitCode;
U_BYTE command; // = DRC_IOCTLINPUT
U_WORD status;
U_BYTE reserved[8];
U_BYTE mediaDescriptor;
U_LONG ctrlBlkAddr;
U_WORD tranSize;
U_WORD startSector;
U_LONG volPtr;
} *cd_IOCTLIn;
static U_WORD cd_IOCTLInSeg;
static U_WORD cd_IOCTLInSel;
static struct RAddrDevHead_s {
U_BYTE code; // ADRDEVHEAD
U_LONG devHdrAddr; // Address of device header
} *cd_RAddrDevHead;
static U_WORD cd_RAddrDevHeadSeg;
static U_WORD cd_RAddrDevHeadSel;
static struct LocHead_s {
U_BYTE code; // HEADLOCATION
U_BYTE addrMode; // Addressing mode
U_LONG headLocation; // Location of drive head
} *cd_LocHead;
static U_WORD cd_LocHeadSeg;
static U_WORD cd_LocHeadSel;
static struct ErrStat_s {
U_BYTE code; // ERRSTATISTICS
U_BYTE errVal; // Error statistics
} *cd_ErrStat;
static U_WORD cd_ErrStatSeg;
static U_WORD cd_ErrStatSel;
static struct AudChanInfo_s {
U_BYTE code; // AUDIOCHANINFO
U_BYTE inChanOut0; // Input chan(0,1,2,or 3) for output chan 0
U_BYTE volumeOut0; // Volume control (0-0xff) for output chan 0
U_BYTE inChanOut1; // Input chan(0,1,2,or 3) for output chan 1
U_BYTE volumeOut1; // Volume control (0-0xff) for output chan 1
U_BYTE inChanOut2; // Input chan(0,1,2,or 3) for output chan 2
U_BYTE volumeOut2; // Volume control (0-0xff) for output chan 2
U_BYTE inChanOut3; // Input chan(0,1,2,or 3) for output chan 3
U_BYTE volumeOut3; // Volume control (0-0xff) for output chan 3
} *cd_AudChanInfo;
static U_WORD cd_AudChanInfoSeg;
static U_WORD cd_AudChanInfoSel;
static struct RDrvBytes_s {
U_BYTE code; // READDRVBYTES
U_BYTE numBytes; // Number of bytes to read
U_BYTE rBuffer[128]; // Read buffer
} *cd_RDrvBytes;
static U_WORD cd_RDrvBytesSeg;
static U_WORD cd_RDrvBytesSel;
static struct DevStat_s {
U_BYTE code; // DEVICESTATUS
U_LONG devParams; // Device parameters
} *cd_DevStat;
static U_WORD cd_DevStatSeg;
static U_WORD cd_DevStatSel;
static struct SectSize_s {
U_BYTE code; // GETSECTORSIZE
U_BYTE readMode; // Read mode
U_WORD sectorSize; // Sector size
} *cd_SectSize;
static U_WORD cd_SectSizeSeg;
static U_WORD cd_SectSizeSel;
static struct VolSize_s {
U_BYTE code; // GETVOLSIZE
U_LONG volumeSize; // Volume size
} *cd_VolSize;
static U_WORD cd_VolSizeSeg;
static U_WORD cd_VolSizeSel;
static struct MedChng_s {
U_BYTE code; // MEDIACHANGED
U_BYTE changed; // Media byte
} *cd_MedChng;
static U_WORD cd_MedChngSeg;
static U_WORD cd_MedChngSel;
static struct DiskInfo_s {
U_BYTE code; // AUDIODISKINFO
U_BYTE lowTrack; // Lowest track number
U_BYTE highTrack; // Highest track number
U_LONG startLeadOut; // Starting point of the lead-out track
} *cd_DiskInfo;
static U_WORD cd_DiskInfoSeg;
static U_WORD cd_DiskInfoSel;
static struct TrackInfo_s {
U_BYTE code; // AUDIOTRACKINFO
U_BYTE track; // Track number
U_LONG start; // Starting point of the track
U_BYTE ctrlInfo; // Track control information
} *cd_TrackInfo;
static U_WORD cd_TrackInfoSeg;
static U_WORD cd_TrackInfoSel;
static struct QInfo_s {
U_BYTE code; // AUDIOQCHANINFO
U_BYTE control; // CONTROL and ADR byte
U_BYTE tno; // Track number (TNO)
U_BYTE index; // (POINT) or Index(X)
U_BYTE min; // (MIN) Running time within a track
U_BYTE sec; // (SEC) " " " " "
U_BYTE frame; // (FRAME) " " " " "
U_BYTE zero; // (ZERO) " " " " "
U_BYTE aMin; // (AMIN) or (PMIN) Running time on disk
U_BYTE aSec; // (ASEC) or (PSEC) " " " "
U_BYTE aFrame; // (AFRAME) or (PFRAME)" " " "
} *cd_QInfo;
static U_WORD cd_QInfoSeg;
static U_WORD cd_QInfoSel;
static struct SubChanInfo_s {
U_BYTE code; // AUDIOSUBINFO
U_LONG startSectAddr; // Starting sector address
U_LONG transAddr; // Transfer address
U_LONG numSects; // Number of sectors to read
} *cd_SubChanInfo;
static U_WORD cd_SubChanInfoSeg;
static U_WORD cd_SubChanInfoSel;
static struct UPCCode_s {
U_BYTE code; // UPCCODE
U_BYTE control; // CONTROL and ADR byte
U_BYTE upc[7]; // UPC/EAN code
U_BYTE zero; // Zero
U_BYTE aFrame; // Aframe
} *cd_UPCCode;
static U_WORD cd_UPCCodeSeg;
static U_WORD cd_UPCCodeSel;
static struct AudStat_s {
U_BYTE code; // AUDIOSTATUSINFO
U_WORD status; // Audio status bits
U_LONG startPlay; // Starting location of last Play/Resume
U_LONG endPlay; // Ending location for last Play/Resume
} *cd_AudStat;
static U_WORD cd_AudStatSeg;
static U_WORD cd_AudStatSel;
// IOCTL Output command data buffer structures
static struct IOCTLOut_s { // IOCTL Output struct
U_BYTE headerSize;
U_BYTE subUnitCode;
U_BYTE command; // = DRC_IOCTLOUTPUT
U_WORD status;
U_BYTE reserved[8];
U_BYTE mediaDescriptor;
U_LONG ctrlBlkAddr;
U_WORD tranSize;
U_WORD startSector;
U_LONG volPtr;
} *cd_IOCTLOut;
static U_WORD cd_IOCTLOutSeg;
static U_WORD cd_IOCTLOutSel;
static struct Eject_s {
U_BYTE code; // EJECTDISK
} *cd_Eject;
static U_WORD cd_EjectSeg;
static U_WORD cd_EjectSel;
static struct LockDoor_s {
U_BYTE code; // DOORLOCK
U_BYTE lock; // Lock function : 0 = unlock, 1 = lock
} *cd_LockDoor;
static U_WORD cd_LockDoorSeg;
static U_WORD cd_LockDoorSel;
static struct ResetDrv_s {
U_BYTE code; // RESETDRIVE
} *cd_ResetDrv;
static U_WORD cd_ResetDrvSeg;
static U_WORD cd_ResetDrvSel;
static struct AudInfo_s {
U_BYTE code; // AUDIOCHANCONTROL
U_BYTE inChanOut0; // Input chan(0,1,2,or 3) for output chan 0
U_BYTE volumeOut0; // Volume control (0-0xff) for output chan 0
U_BYTE inChanOut1; // Input chan(0,1,2,or 3) for output chan 1
U_BYTE volumeOut1; // Volume control (0-0xff) for output chan 1
U_BYTE inChanOut2; // Input chan(0,1,2,or 3) for output chan 2
U_BYTE volumeOut2; // Volume control (0-0xff) for output chan 2
U_BYTE inChanOut3; // Input chan(0,1,2,or 3) for output chan 3
U_BYTE volumeOut3; // Volume control (0-0xff) for output chan 3
} *cd_AudInfo;
static U_WORD cd_AudInfoSeg;
static U_WORD cd_AudInfoSel;
static struct WDrvBytes_s {
U_BYTE code; // WRITEDEVCONTROL
U_BYTE buf[5]; // Write buffer - size ??
} *cd_WDrvBytes;
static U_WORD cd_WDrvBytesSeg;
static U_WORD cd_WDrvBytesSel;
static struct CloseTray_s {
U_BYTE code; // CLOSETRAY
} *cd_CloseTray;
static U_WORD cd_CloseTraySeg;
static U_WORD cd_CloseTraySel;
static U_WORD InCtrlBlkSize[16] = {
0x05, 0x06, 0x00, 0x00,
0x09, 0x82, 0x05, 0x04,
0x05, 0x02, 0x07, 0x07,
0x0b, 0x0d, 0x0b, 0x0b
};
static U_WORD OutCtrlBlkSize[6] = {
0x01, 0x02,
0x01, 0x09,
0x06, 0x01
};
// Structures for allocating conventional memory
static DOSChunk_t DOSChunks[] = {
{
sizeof(struct PlayReq_s),
&cd_PlayReq, &cd_PlayReqSeg, &cd_PlayReqSel
},
{
sizeof(struct StopReq_s),
&cd_StopReq, &cd_StopReqSeg, &cd_StopReqSel
},
{
sizeof(struct ResumeReq_s),
&cd_ResumeReq, &cd_ResumeReqSeg, &cd_ResumeReqSel
},
{
sizeof(struct IOCTLOut_s),
&cd_IOCTLOut, &cd_IOCTLOutSeg, &cd_IOCTLOutSel
},
{
sizeof(struct Eject_s),
&cd_Eject, &cd_EjectSeg, &cd_EjectSel
},
{
sizeof(struct LockDoor_s),
&cd_LockDoor, &cd_LockDoorSeg, &cd_LockDoorSel
},
{
sizeof(struct ResetDrv_s),
&cd_ResetDrv, &cd_ResetDrvSeg, &cd_ResetDrvSel
},
{
sizeof(struct AudInfo_s),
&cd_AudInfo, &cd_AudInfoSeg, &cd_AudInfoSel
},
{
sizeof(struct WDrvBytes_s),
&cd_WDrvBytes, &cd_WDrvBytesSeg, &cd_WDrvBytesSel
},
{
sizeof(struct CloseTray_s),
&cd_CloseTray, &cd_CloseTraySeg, &cd_CloseTraySel
},
{
sizeof(struct IOCTLIn_s),
&cd_IOCTLIn, &cd_IOCTLInSeg, &cd_IOCTLInSel
},
{
sizeof(struct RAddrDevHead_s),
&cd_RAddrDevHead, &cd_RAddrDevHeadSeg, &cd_RAddrDevHeadSel
},
{
sizeof(struct LocHead_s),
&cd_LocHead, &cd_LocHeadSeg, &cd_LocHeadSel
},
{
sizeof(struct ErrStat_s),
&cd_ErrStat, &cd_ErrStatSeg, &cd_ErrStatSel
},
{
sizeof(struct AudChanInfo_s),
&cd_AudChanInfo, &cd_AudChanInfoSeg, &cd_AudChanInfoSel
},
{
sizeof(struct RDrvBytes_s),
&cd_RDrvBytes, &cd_RDrvBytesSeg, &cd_RDrvBytesSel
},
{
sizeof(struct DevStat_s),
&cd_DevStat, &cd_DevStatSeg, &cd_DevStatSel
},
{
sizeof(struct SectSize_s),
&cd_SectSize, &cd_SectSizeSeg, &cd_SectSizeSel
},
{
sizeof(struct VolSize_s),
&cd_VolSize, &cd_VolSizeSeg, &cd_VolSizeSel
},
{
sizeof(struct MedChng_s),
&cd_MedChng, &cd_MedChngSeg, &cd_MedChngSel
},
{
sizeof(struct DiskInfo_s),
&cd_DiskInfo, &cd_DiskInfoSeg, &cd_DiskInfoSel
},
{
sizeof(struct TrackInfo_s),
&cd_TrackInfo, &cd_TrackInfoSeg, &cd_TrackInfoSel
},
{
sizeof(struct QInfo_s),
&cd_QInfo, &cd_QInfoSeg, &cd_QInfoSel
},
{
sizeof(struct SubChanInfo_s),
&cd_SubChanInfo, &cd_SubChanInfoSeg, &cd_SubChanInfoSel
},
{
sizeof(struct UPCCode_s),
&cd_UPCCode, &cd_UPCCodeSeg, &cd_UPCCodeSel
},
{
sizeof(struct AudStat_s),
&cd_AudStat, &cd_AudStatSeg, &cd_AudStatSel
},
{
0, NULL, NULL, NULL
}
};
// CODE --------------------------------------------------------------------
//==========================================================================
//
// I_CDMusInit
//
// Initializes the CD audio system. Must be called before using any
// other I_CDMus functions.
//
// Returns: 0 (ok) or -1 (error, in cd_Error).
//
//==========================================================================
int I_CDMusInit(void)
{
int i;
int sect;
int maxTrack;
S_BYTE startMin1 = 0;
S_BYTE startSec1 = 0;
S_BYTE startMin2 = 0;
S_BYTE startSec2 = 0;
S_BYTE lengthMin = 0;
S_BYTE lengthSec = 0;
if(OkInit != 1)
{ // Only execute if uninitialized
// Get number of CD-ROM drives and first drive
memset(&RegBlock, 0, sizeof(RegBlock));
RegBlock.eax = CDROM_GETDRIVECOUNT;
RegBlock.ebx = 0;
DPMI_SimRealInt(MULTIPLEX_INT, &RegBlock);
cd_DriveCount = RegBlock.ebx;
// MSCDEX not installed if number of drives = 0
if(cd_DriveCount == 0)
{
cd_Error = CDERR_NOTINSTALLED;
return -1;
}
cd_FirstDrive = RegBlock.ecx;
cd_CurDrive = cd_FirstDrive;
// Allocate the IOCTL buffers
if(AllocIOCTLBuffers() == -1)
{
cd_Error = CDERR_IOCTLBUFFMEM;
return -1;
}
// Get MSCDEX version
// Major version in upper byte, minor version in lower byte
memset(&RegBlock, 0, sizeof(RegBlock));
RegBlock.eax = CDROM_GETVERSION;
DPMI_SimRealInt(MULTIPLEX_INT, &RegBlock);
cd_Version = RegBlock.ebx;
// Check device status to make sure we can read Audio CD's
InputIOCTL(DEVICESTATUS, cd_DevStatSeg);
if((cd_DevStat->devParams & 0x0010) == 0)
{
cd_Error = CDERR_NOAUDIOSUPPORT;
return -1;
}
}
// Force audio to stop playing
I_CDMusStop();
// Make sure we have the current TOC
InputIOCTL(MEDIACHANGED, cd_MedChngSeg);
// Set track variables
InputIOCTL(AUDIODISKINFO, cd_DiskInfoSeg);
cd_FirstTrack = cd_DiskInfo->lowTrack;
cd_LastTrack = cd_DiskInfo->highTrack;
if(cd_FirstTrack == 0 && cd_FirstTrack == cd_LastTrack)
{
cd_Error = CDERR_NOAUDIOTRACKS;
return -1;
}
cd_TrackCount = cd_LastTrack-cd_FirstTrack+1;
cd_LeadOutMin = cd_DiskInfo->startLeadOut>>16 & 0xFF;
cd_LeadOutSec = cd_DiskInfo->startLeadOut>>8 & 0xFF;
cd_LeadOutRed = cd_DiskInfo->startLeadOut;
cd_LeadOutSector = RedToSectors(cd_DiskInfo->startLeadOut);
// Create Red Book start, sector start, and sector length
// for all tracks
sect = cd_LeadOutSector;
for(i = cd_LastTrack; i >= cd_FirstTrack; i--)
{
cd_TrackInfo->track = i;
InputIOCTL(AUDIOTRACKINFO, cd_TrackInfoSeg);
if(i < MAX_AUDIO_TRACKS)
{
cd_AudioTracks[i].redStart = cd_TrackInfo->start;
cd_AudioTracks[i].sectorStart =
RedToSectors(cd_TrackInfo->start);
cd_AudioTracks[i].sectorLength =
sect-RedToSectors(cd_TrackInfo->start);
}
sect = RedToSectors(cd_TrackInfo->start);
}
// Create track lengths in minutes and seconds
if(cd_LastTrack >= MAX_AUDIO_TRACKS)
{
maxTrack = MAX_AUDIO_TRACKS-1;
}
else
{
maxTrack = cd_LastTrack;
}
cd_TrackInfo->track = cd_FirstTrack;
InputIOCTL(AUDIOTRACKINFO, cd_TrackInfoSeg);
startMin1 = (cd_TrackInfo->start >> 16);
startSec1 = (cd_TrackInfo->start >> 8);
for(i = cd_FirstTrack; i <= maxTrack; i++)
{
cd_TrackInfo->track = i+1;
if(i < cd_LastTrack)
{
InputIOCTL(AUDIOTRACKINFO, cd_TrackInfoSeg);
startMin2 = (cd_TrackInfo->start >> 16);
startSec2 = (cd_TrackInfo->start >> 8);
}
else
{
startMin2 = cd_LeadOutRed>>16;
startSec2 = cd_LeadOutRed>>8;
}
lengthSec = startSec2 - startSec1;
lengthMin = startMin2 - startMin1;
if(lengthSec < 0)
{
lengthSec += 60;
lengthMin--;
}
cd_AudioTracks[i].lengthMin = lengthMin;
cd_AudioTracks[i].lengthSec = lengthSec;
startMin1 = startMin2;
startSec1 = startSec2;
}
// Clip high tracks
cd_LastTrack = maxTrack;
OkInit = 1;
return 0;
}
//==========================================================================
//
// I_CDMusPlay
//
// Play an audio CD track.
//
// Returns: 0 (ok) or -1 (error, in cd_Error).
//
//==========================================================================
int I_CDMusPlay(int track)
{
int start;
int len;
if(track < cd_FirstTrack || track > cd_LastTrack)
{
cd_Error = CDERR_BADTRACK;
return(-1);
}
I_CDMusStop();
start = cd_AudioTracks[track].redStart;
len = cd_AudioTracks[track].sectorLength;
cd_PlayReq->addressMode = RED_MODE;
cd_PlayReq->startSector = start;
cd_PlayReq->numberToRead = len;
memset(&RegBlock, 0, sizeof(RegBlock));
RegBlock.eax = CDROM_SENDDEVICEREQ;
RegBlock.ecx = cd_CurDrive;
RegBlock.ebx = 0;
RegBlock.es = cd_PlayReqSeg;
DPMI_SimRealInt(MULTIPLEX_INT, &RegBlock);
if(cd_PlayReq->status&0x8000)
{
cd_Error = CDERR_DEVREQBASE+(cd_PlayReq->status)&0x00ff;
return(-1);
}
return(0);
}
//==========================================================================
//
// I_CDMusStop
//
// Stops the playing of an audio CD.
//
// Returns: 0 (ok) or -1 (error, in cd_Error).
//
//==========================================================================
int I_CDMusStop(void)
{
memset(&RegBlock, 0, sizeof(RegBlock));
RegBlock.eax = CDROM_SENDDEVICEREQ;
RegBlock.ecx = cd_CurDrive;
RegBlock.ebx = 0;
RegBlock.es = cd_StopReqSeg;
DPMI_SimRealInt(MULTIPLEX_INT, &RegBlock);
if(cd_StopReq->status&0x8000)
{
cd_Error = CDERR_DEVREQBASE+(cd_StopReq->status)&0x00ff;
return -1;
}
return 0;
}
//==========================================================================
//
// I_CDMusResume
//
// Resumes the playing of an audio CD.
//
// Returns: 0 (ok) or -1 (error, in cd_Error).
//
//==========================================================================
int I_CDMusResume(void)
{
memset(&RegBlock, 0, sizeof(RegBlock));
RegBlock.eax = CDROM_SENDDEVICEREQ;
RegBlock.ecx = cd_CurDrive;
RegBlock.ebx = 0;
RegBlock.es = cd_ResumeReqSeg;
DPMI_SimRealInt(MULTIPLEX_INT, &RegBlock);
if(cd_ResumeReq->status&0x8000)
{
cd_Error = CDERR_DEVREQBASE+(cd_ResumeReq->status)&0x00ff;
return -1;
}
return 0;
}
//==========================================================================
//
// I_CDMusSetVolume
//
// Sets the CD audio volume (0 - 255).
//
// Returns: 0 (ok) or -1 (error, in cd_Error).
//
//==========================================================================
int I_CDMusSetVolume(int volume)
{
if(!OkInit)
{
cd_Error = CDERR_NOTINSTALLED;
return -1;
}
// Read current channel info
InputIOCTL(AUDIOCHANINFO, cd_AudChanInfoSeg);
// Change the volumes
cd_AudChanInfo->volumeOut0 =
cd_AudChanInfo->volumeOut1 =
cd_AudChanInfo->volumeOut2 =
cd_AudChanInfo->volumeOut3 = volume;
// Write modified channel info
OutputIOCTL(AUDIOCHANCONTROL, cd_AudChanInfoSeg);
return 0;
}
//==========================================================================
//
// I_CDMusFirstTrack
//
// Returns: the number of the first track.
//
//==========================================================================
int I_CDMusFirstTrack(void)
{
return cd_FirstTrack;
}
//==========================================================================
//
// I_CDMusLastTrack
//
// Returns: the number of the last track.
//
//==========================================================================
int I_CDMusLastTrack(void)
{
return cd_LastTrack;
}
//==========================================================================
//
// I_CDMusTrackLength
//
// Returns: Length of the given track in seconds, or -1 (error, in
// cd_Error).
//
//==========================================================================
int I_CDMusTrackLength(int track)
{
if(track < cd_FirstTrack || track > cd_LastTrack)
{
cd_Error = CDERR_BADTRACK;
return -1;
}
return cd_AudioTracks[track].lengthMin*60
+cd_AudioTracks[track].lengthSec;
}
//==========================================================================
//
// AllocIOCTLBuffers
//
// Allocates conventional memory for the IOCTL input and output buffers.
// Sets cd_IOCTLBufferTotal to the total allocated.
//
// Returns: 0 (ok) or -1 (error, in cd_Error).
//
//==========================================================================
static int AllocIOCTLBuffers(void)
{
int i;
int size;
DOSChunk_t *ck;
cd_IOCTLBufferTotal = 0;
for(i = 0; DOSChunks[i].size != 0; i++)
{
ck = &DOSChunks[i];
size = ck->size;
cd_IOCTLBufferTotal += (size+15)&0xfffffff0;
*ck->address = DPMI_AllocRealMem(size, ck->segment, ck->selector);
if(*ck->address == NULL)
{
return -1;
}
memset(*ck->address, 0, size);
}
cd_IOCTLIn->headerSize = sizeof(struct IOCTLIn_s);
cd_IOCTLIn->command = DRC_IOCTLINPUT;
cd_IOCTLOut->headerSize = sizeof(struct IOCTLOut_s);
cd_IOCTLOut->command = DRC_IOCTLOUTPUT;
cd_PlayReq->headerSize = sizeof(struct PlayReq_s);
cd_PlayReq->command = DRC_PLAYAUDIO;
cd_StopReq->headerSize = sizeof(struct StopReq_s);
cd_StopReq->command = DRC_STOPAUDIO;
cd_ResumeReq->headerSize = sizeof(struct ResumeReq_s);
cd_ResumeReq->command = DRC_RESUMEAUDIO;
return 0;
}
//==========================================================================
//
// InputIOCTL
//
// Sends an IOCTL input device request command.
//
// Returns: the status of the request.
//
//==========================================================================
static U_WORD InputIOCTL(S_LONG request, U_WORD buffSeg)
{
U_BYTE *code;
code = (U_BYTE *)(buffSeg<<4);
*code = (U_BYTE)request;
cd_IOCTLIn->ctrlBlkAddr = buffSeg<<16;
cd_IOCTLIn->tranSize = InCtrlBlkSize[request];
memset(&RegBlock, 0, sizeof(RegBlock));
RegBlock.eax = CDROM_SENDDEVICEREQ;
RegBlock.ecx = cd_CurDrive;
RegBlock.ebx = 0;
RegBlock.es = cd_IOCTLInSeg;
DPMI_SimRealInt(MULTIPLEX_INT, &RegBlock);
return cd_IOCTLIn->status;
}
//==========================================================================
//
// OutputIOCTL
//
// Sends an IOCTL output device request command.
//
// Returns: the status of the request.
//
//==========================================================================
static U_WORD OutputIOCTL(S_LONG request, U_WORD buffSeg)
{
U_BYTE *code;
code = (U_BYTE *)(buffSeg<<4);
*code = (U_BYTE)request;
cd_IOCTLOut->ctrlBlkAddr = buffSeg<<16;
cd_IOCTLOut->tranSize = OutCtrlBlkSize[request];
RegBlock.eax = CDROM_SENDDEVICEREQ;
RegBlock.ecx = cd_CurDrive;
RegBlock.ebx = 0;
RegBlock.es = cd_IOCTLOutSeg;
DPMI_SimRealInt(MULTIPLEX_INT, &RegBlock);
return cd_IOCTLOut->status;
}
//==========================================================================
//
// RedToSectors
//
// Converts Red Book addresses to HSG sectors.
// Sectors = Minutes * 60 * 75 + Seconds * 75 + Frame - 150
//
// Returns: HSG sectors.
//
//==========================================================================
static U_LONG RedToSectors(U_LONG red)
{
U_LONG sector;
sector = ((red&0x00ff0000) >> 16) * 60 * 75;
sector += ((red&0x0000ff00) >> 8) * 75;
sector += (red&0x000000ff);
return sector-150;
}
//==========================================================================
//
// DPMI_SimRealInt
//
//==========================================================================
static void DPMI_SimRealInt(U_LONG intr, RegBlock_t *rBlock)
{
union REGS regs;
struct SREGS sRegs;
regs.x.eax = DPMI_SIMREALINT;
regs.x.ebx = intr;
regs.x.ecx = 0;
regs.x.edi = FP_OFF((void far *)rBlock);
sRegs.es = FP_SEG((void far *)rBlock);
sRegs.ds = FP_SEG((void far *)rBlock);
int386x(DPMI_INT, ®s, ®s, &sRegs);
}
//==========================================================================
//
// DPMI_AllocRealMem
//
//==========================================================================
static void *DPMI_AllocRealMem(U_LONG size, U_WORD *segment,
U_WORD *selector)
{
union REGS inRegs;
union REGS outRegs;
inRegs.x.eax = DPMI_ALLOCREALMEM;
inRegs.x.ebx = (size+15)/16;
int386(DPMI_INT, &inRegs, &outRegs);
if(outRegs.x.cflag)
{
return NULL;
}
*segment = outRegs.x.eax&0xffff;
*selector = outRegs.x.edx&0xffff;
return (void *)(outRegs.x.eax<<4);
}
//==========================================================================
//
// DPMI_FreeRealMem
//
//==========================================================================
static void DPMI_FreeRealMem(U_WORD selector)
{
union REGS regs;
regs.x.eax = DPMI_FREEREALMEM;
regs.x.edx = selector;
int386(DPMI_INT, ®s, ®s);
}