SDL_syscdrom.c
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/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2006 Sam Lantinga
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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Sam Lantinga
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slouken@libsdl.org
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*/
/* Functions for system-level CD-ROM audio control */
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#include "SDL_windows.h"
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#include <mmsystem.h>
#include "SDL_error.h"
#include "SDL_cdrom.h"
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#include "SDL_stdlib.h"
#include "SDL_string.h"
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#include "SDL_syscdrom.h"
/* This really broken?? */
#define BROKEN_MCI_PAUSE /* Pausing actually stops play -- Doh! */
/* The maximum number of CD-ROM drives we'll detect (Don't change!) */
#define MAX_DRIVES 26
/* A list of available CD-ROM drives */
static char *SDL_cdlist[MAX_DRIVES];
static MCIDEVICEID SDL_mciID[MAX_DRIVES];
#ifdef BROKEN_MCI_PAUSE
static int SDL_paused[MAX_DRIVES];
#endif
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static int SDL_CD_end_position;
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/* The system-dependent CD control functions */
static const char *SDL_SYS_CDName(int drive);
static int SDL_SYS_CDOpen(int drive);
static int SDL_SYS_CDGetTOC(SDL_CD *cdrom);
static CDstatus SDL_SYS_CDStatus(SDL_CD *cdrom, int *position);
static int SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length);
static int SDL_SYS_CDPause(SDL_CD *cdrom);
static int SDL_SYS_CDResume(SDL_CD *cdrom);
static int SDL_SYS_CDStop(SDL_CD *cdrom);
static int SDL_SYS_CDEject(SDL_CD *cdrom);
static void SDL_SYS_CDClose(SDL_CD *cdrom);
/* Add a CD-ROM drive to our list of valid drives */
static void AddDrive(char *drive)
{
int i;
if ( SDL_numcds < MAX_DRIVES ) {
/* Add this drive to our list */
i = SDL_numcds;
SDL_cdlist[i] = (char *)malloc(strlen(drive)+1);
if ( SDL_cdlist[i] == NULL ) {
SDL_OutOfMemory();
return;
}
strcpy(SDL_cdlist[i], drive);
++SDL_numcds;
#ifdef CDROM_DEBUG
fprintf(stderr, "Added CD-ROM drive: %s\n", drive);
#endif
}
}
int SDL_SYS_CDInit(void)
{
/* checklist: Drive 'A' - 'Z' */
int i;
char drive[4];
/* Fill in our driver capabilities */
SDL_CDcaps.Name = SDL_SYS_CDName;
SDL_CDcaps.Open = SDL_SYS_CDOpen;
SDL_CDcaps.GetTOC = SDL_SYS_CDGetTOC;
SDL_CDcaps.Status = SDL_SYS_CDStatus;
SDL_CDcaps.Play = SDL_SYS_CDPlay;
SDL_CDcaps.Pause = SDL_SYS_CDPause;
SDL_CDcaps.Resume = SDL_SYS_CDResume;
SDL_CDcaps.Stop = SDL_SYS_CDStop;
SDL_CDcaps.Eject = SDL_SYS_CDEject;
SDL_CDcaps.Close = SDL_SYS_CDClose;
/* Scan the system for CD-ROM drives */
for ( i='A'; i<='Z'; ++i ) {
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snprintf(drive, SDL_arraysize(drive), "%c:\\", i);
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if ( GetDriveType(drive) == DRIVE_CDROM ) {
AddDrive(drive);
}
}
memset(SDL_mciID, 0, sizeof(SDL_mciID));
return(0);
}
/* General ioctl() CD-ROM command function */
static int SDL_SYS_CDioctl(int id, UINT msg, DWORD flags, void *arg)
{
MCIERROR mci_error;
mci_error = mciSendCommand(SDL_mciID[id], msg, flags, (DWORD)arg);
if ( mci_error ) {
char error[256];
mciGetErrorString(mci_error, error, 256);
SDL_SetError("mciSendCommand() error: %s", error);
}
return(!mci_error ? 0 : -1);
}
static const char *SDL_SYS_CDName(int drive)
{
return(SDL_cdlist[drive]);
}
static int SDL_SYS_CDOpen(int drive)
{
MCI_OPEN_PARMS mci_open;
MCI_SET_PARMS mci_set;
char device[3];
DWORD flags;
/* Open the requested device */
mci_open.lpstrDeviceType = (LPCSTR) MCI_DEVTYPE_CD_AUDIO;
device[0] = *SDL_cdlist[drive];
device[1] = ':';
device[2] = '\0';
mci_open.lpstrElementName = device;
flags =
(MCI_OPEN_TYPE|MCI_OPEN_SHAREABLE|MCI_OPEN_TYPE_ID|MCI_OPEN_ELEMENT);
if ( SDL_SYS_CDioctl(0, MCI_OPEN, flags, &mci_open) < 0 ) {
flags &= ~MCI_OPEN_SHAREABLE;
if ( SDL_SYS_CDioctl(0, MCI_OPEN, flags, &mci_open) < 0 ) {
return(-1);
}
}
SDL_mciID[drive] = mci_open.wDeviceID;
/* Set the minute-second-frame time format */
mci_set.dwTimeFormat = MCI_FORMAT_MSF;
SDL_SYS_CDioctl(drive, MCI_SET, MCI_SET_TIME_FORMAT, &mci_set);
#ifdef BROKEN_MCI_PAUSE
SDL_paused[drive] = 0;
#endif
return(drive);
}
static int SDL_SYS_CDGetTOC(SDL_CD *cdrom)
{
MCI_STATUS_PARMS mci_status;
int i, okay;
DWORD flags;
okay = 0;
mci_status.dwItem = MCI_STATUS_NUMBER_OF_TRACKS;
flags = MCI_STATUS_ITEM | MCI_WAIT;
if ( SDL_SYS_CDioctl(cdrom->id, MCI_STATUS, flags, &mci_status) == 0 ) {
cdrom->numtracks = mci_status.dwReturn;
if ( cdrom->numtracks > SDL_MAX_TRACKS ) {
cdrom->numtracks = SDL_MAX_TRACKS;
}
/* Read all the track TOC entries */
flags = MCI_STATUS_ITEM | MCI_TRACK | MCI_WAIT;
for ( i=0; i<cdrom->numtracks; ++i ) {
cdrom->track[i].id = i+1;
mci_status.dwTrack = cdrom->track[i].id;
#ifdef MCI_CDA_STATUS_TYPE_TRACK
mci_status.dwItem = MCI_CDA_STATUS_TYPE_TRACK;
if ( SDL_SYS_CDioctl(cdrom->id, MCI_STATUS, flags,
&mci_status) < 0 ) {
break;
}
if ( mci_status.dwReturn == MCI_CDA_TRACK_AUDIO ) {
cdrom->track[i].type = SDL_AUDIO_TRACK;
} else {
cdrom->track[i].type = SDL_DATA_TRACK;
}
#else
cdrom->track[i].type = SDL_AUDIO_TRACK;
#endif
mci_status.dwItem = MCI_STATUS_POSITION;
if ( SDL_SYS_CDioctl(cdrom->id, MCI_STATUS, flags,
&mci_status) < 0 ) {
break;
}
cdrom->track[i].offset = MSF_TO_FRAMES(
MCI_MSF_MINUTE(mci_status.dwReturn),
MCI_MSF_SECOND(mci_status.dwReturn),
MCI_MSF_FRAME(mci_status.dwReturn));
cdrom->track[i].length = 0;
if ( i > 0 ) {
cdrom->track[i-1].length =
cdrom->track[i].offset-
cdrom->track[i-1].offset;
}
}
if ( i == cdrom->numtracks ) {
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mci_status.dwTrack = cdrom->track[i - 1].id;
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mci_status.dwItem = MCI_STATUS_LENGTH;
if ( SDL_SYS_CDioctl(cdrom->id, MCI_STATUS, flags,
&mci_status) == 0 ) {
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cdrom->track[i - 1].length = MSF_TO_FRAMES(
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MCI_MSF_MINUTE(mci_status.dwReturn),
MCI_MSF_SECOND(mci_status.dwReturn),
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MCI_MSF_FRAME(mci_status.dwReturn)) + 1; /* +1 to fix */
/* MCI last track length bug */
/* compute lead-out offset */
cdrom->track[i].offset = cdrom->track[i - 1].offset +
cdrom->track[i - 1].length;
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cdrom->track[i].length = 0;
okay = 1;
}
}
}
return(okay ? 0 : -1);
}
/* Get CD-ROM status */
static CDstatus SDL_SYS_CDStatus(SDL_CD *cdrom, int *position)
{
CDstatus status;
MCI_STATUS_PARMS mci_status;
DWORD flags;
flags = MCI_STATUS_ITEM | MCI_WAIT;
mci_status.dwItem = MCI_STATUS_MODE;
if ( SDL_SYS_CDioctl(cdrom->id, MCI_STATUS, flags, &mci_status) < 0 ) {
status = CD_ERROR;
} else {
switch (mci_status.dwReturn) {
case MCI_MODE_NOT_READY:
case MCI_MODE_OPEN:
status = CD_TRAYEMPTY;
break;
case MCI_MODE_STOP:
#ifdef BROKEN_MCI_PAUSE
if ( SDL_paused[cdrom->id] ) {
status = CD_PAUSED;
} else {
status = CD_STOPPED;
}
#else
status = CD_STOPPED;
#endif /* BROKEN_MCI_PAUSE */
break;
case MCI_MODE_PLAY:
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#ifdef BROKEN_MCI_PAUSE
if ( SDL_paused[cdrom->id] ) {
status = CD_PAUSED;
} else {
status = CD_PLAYING;
}
#else
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status = CD_PLAYING;
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#endif /* BROKEN_MCI_PAUSE */
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break;
case MCI_MODE_PAUSE:
status = CD_PAUSED;
break;
default:
status = CD_ERROR;
break;
}
}
if ( position ) {
if ( status == CD_PLAYING || (status == CD_PAUSED) ) {
mci_status.dwItem = MCI_STATUS_POSITION;
if ( SDL_SYS_CDioctl(cdrom->id, MCI_STATUS, flags,
&mci_status) == 0 ) {
*position = MSF_TO_FRAMES(
MCI_MSF_MINUTE(mci_status.dwReturn),
MCI_MSF_SECOND(mci_status.dwReturn),
MCI_MSF_FRAME(mci_status.dwReturn));
} else {
*position = 0;
}
} else {
*position = 0;
}
}
return(status);
}
/* Start play */
static int SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length)
{
MCI_PLAY_PARMS mci_play;
int m, s, f;
DWORD flags;
flags = MCI_FROM | MCI_TO | MCI_NOTIFY;
mci_play.dwCallback = 0;
FRAMES_TO_MSF(start, &m, &s, &f);
mci_play.dwFrom = MCI_MAKE_MSF(m, s, f);
FRAMES_TO_MSF(start+length, &m, &s, &f);
mci_play.dwTo = MCI_MAKE_MSF(m, s, f);
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SDL_CD_end_position = mci_play.dwTo;
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return(SDL_SYS_CDioctl(cdrom->id, MCI_PLAY, flags, &mci_play));
}
/* Pause play */
static int SDL_SYS_CDPause(SDL_CD *cdrom)
{
#ifdef BROKEN_MCI_PAUSE
SDL_paused[cdrom->id] = 1;
#endif
return(SDL_SYS_CDioctl(cdrom->id, MCI_PAUSE, MCI_WAIT, NULL));
}
/* Resume play */
static int SDL_SYS_CDResume(SDL_CD *cdrom)
{
#ifdef BROKEN_MCI_PAUSE
MCI_STATUS_PARMS mci_status;
int okay;
int flags;
okay = 0;
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/* Play from the current play position to the end position set earlier */
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flags = MCI_STATUS_ITEM | MCI_WAIT;
mci_status.dwItem = MCI_STATUS_POSITION;
if ( SDL_SYS_CDioctl(cdrom->id, MCI_STATUS, flags, &mci_status) == 0 ) {
MCI_PLAY_PARMS mci_play;
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flags = MCI_FROM | MCI_TO | MCI_NOTIFY;
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mci_play.dwCallback = 0;
mci_play.dwFrom = mci_status.dwReturn;
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mci_play.dwTo = SDL_CD_end_position;
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if (SDL_SYS_CDioctl(cdrom->id,MCI_PLAY,flags,&mci_play) == 0) {
okay = 1;
SDL_paused[cdrom->id] = 0;
}
}
return(okay ? 0 : -1);
#else
return(SDL_SYS_CDioctl(cdrom->id, MCI_RESUME, MCI_WAIT, NULL));
#endif /* BROKEN_MCI_PAUSE */
}
/* Stop play */
static int SDL_SYS_CDStop(SDL_CD *cdrom)
{
return(SDL_SYS_CDioctl(cdrom->id, MCI_STOP, MCI_WAIT, NULL));
}
/* Eject the CD-ROM */
static int SDL_SYS_CDEject(SDL_CD *cdrom)
{
return(SDL_SYS_CDioctl(cdrom->id, MCI_SET, MCI_SET_DOOR_OPEN, NULL));
}
/* Close the CD-ROM handle */
static void SDL_SYS_CDClose(SDL_CD *cdrom)
{
SDL_SYS_CDioctl(cdrom->id, MCI_CLOSE, MCI_WAIT, NULL);
}
void SDL_SYS_CDQuit(void)
{
int i;
if ( SDL_numcds > 0 ) {
for ( i=0; i<SDL_numcds; ++i ) {
free(SDL_cdlist[i]);
}
SDL_numcds = 0;
}
}