/*

SDL - Simple DirectMedia Layer

This library is free software; you can redistribute it and/or

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

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

Sam Lantinga

slouken@libsdl.org

*/

#include "SDL_syscdrom_c.h"

#pragma mark -- Globals --

static FSRef** tracks;

static FSVolumeRefNum* volumes;

static CDstatus status;

static int nextTrackFrame;

static int nextTrackFramesRemaining;

static int fakeCD;

static int currentTrack;

static int didReadTOC;

static int cacheTOCNumTracks;

static int currentDrive; /* Only allow 1 drive in use at a time */

#pragma mark -- Prototypes --

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);

#pragma mark -- Helper Functions --

/* Read a list of tracks from the volume */

static int LoadTracks (SDL_CD *cdrom)

{

/* Check if tracks are already loaded */

if ( tracks[cdrom->id] != NULL )

return 0;

/* Allocate memory for tracks */

tracks[cdrom->id] = (FSRef*) calloc (1, sizeof(**tracks) * cdrom->numtracks);

if (tracks[cdrom->id] == NULL) {

SDL_OutOfMemory ();

return -1;

}

/* Load tracks */

if (ListTrackFiles (volumes[cdrom->id], tracks[cdrom->id], cdrom->numtracks) < 0)

return -1;

return 0;

}

/* Find a file for a given start frame and length */

static FSRef* GetFileForOffset (SDL_CD *cdrom, int start, int length, int *outStartFrame, int *outStopFrame)

{

int i;

for (i = 0; i < cdrom->numtracks; i++) {

if (cdrom->track[i].offset <= start &&

start < (cdrom->track[i].offset + cdrom->track[i].length))

break;

}

if (i == cdrom->numtracks)

return NULL;

currentTrack = i;

*outStartFrame = start - cdrom->track[i].offset;

if ((*outStartFrame + length) < cdrom->track[i].length) {

*outStopFrame = *outStartFrame + length;

length = 0;

nextTrackFrame = -1;

nextTrackFramesRemaining = -1;

}

else {

*outStopFrame = -1;

length -= cdrom->track[i].length - *outStartFrame;

nextTrackFrame = cdrom->track[i+1].offset;

nextTrackFramesRemaining = length;

}

return &tracks[cdrom->id][i];

}

/* Setup another file for playback, or stop playback (called from another thread) */

static void CompletionProc (SDL_CD *cdrom)

{

Lock ();

if (nextTrackFrame > 0 && nextTrackFramesRemaining > 0) {

/* Load the next file to play */

int startFrame, stopFrame;

FSRef *file;

PauseFile ();

ReleaseFile ();

file = GetFileForOffset (cdrom, nextTrackFrame,

nextTrackFramesRemaining, &startFrame, &stopFrame);

if (file == NULL) {

status = CD_STOPPED;

Unlock ();

return;

}

LoadFile (file, startFrame, stopFrame);

SetCompletionProc (CompletionProc, cdrom);

PlayFile ();

}

else {

/* Release the current file */

PauseFile ();

ReleaseFile ();

status = CD_STOPPED;

}

Unlock ();

}

#pragma mark -- Driver Functions --

/* Initialize */

int SDL_SYS_CDInit (void)

{

/* Initialize globals */

volumes = NULL;

tracks = NULL;

status = CD_STOPPED;

nextTrackFrame = -1;

nextTrackFramesRemaining = -1;

fakeCD = SDL_FALSE;

currentTrack = -1;

didReadTOC = SDL_FALSE;

cacheTOCNumTracks = -1;

currentDrive = -1;

/* Fill in function pointers */

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;

/*

Read the list of "drives"

This is currently a hack that infers drives from

mounted audio CD volumes, rather than

actual CD-ROM devices - which means it may not

act as expected sometimes.

*/

/* Find out how many cd volumes are mounted */

SDL_numcds = DetectAudioCDVolumes (NULL, 0);

/*

If there are no volumes, fake a cd device

so tray empty can be reported.

*/

if (SDL_numcds == 0) {

fakeCD = SDL_TRUE;

SDL_numcds = 1;

status = CD_TRAYEMPTY;

return 0;

}

/* Allocate space for volumes */

volumes = (FSVolumeRefNum*) calloc (1, sizeof(*volumes) * SDL_numcds);

if (volumes == NULL) {

SDL_OutOfMemory ();

return -1;

}

/* Allocate space for tracks */

tracks = (FSRef**) calloc (1, sizeof(*tracks) * (SDL_numcds + 1));

if (tracks == NULL) {

SDL_OutOfMemory ();

return -1;

}

/* Mark the end of the tracks array */

tracks[ SDL_numcds ] = (FSRef*)-1;

/*

Redetect, now save all volumes for later

Update SDL_numcds just in case it changed

*/

{

int numVolumes = SDL_numcds;

SDL_numcds = DetectAudioCDVolumes (volumes, numVolumes);

/* If more cds suddenly show up, ignore them */

if (SDL_numcds > numVolumes) {

SDL_SetError ("Some CD's were added but they will be ignored");

SDL_numcds = numVolumes;

}

}

return 0;

}

/* Shutdown and cleanup */

void SDL_SYS_CDQuit(void)

{

ReleaseFile();

if (volumes != NULL)

free (volumes);

if (tracks != NULL) {

FSRef **ptr;

for (ptr = tracks; *ptr != (FSRef*)-1; ptr++)

if (*ptr != NULL)

free (*ptr);

free (tracks);

}

}

/* Get the Unix disk name of the volume */

static const char *SDL_SYS_CDName (int drive)

{

OSStatus err = noErr;

HParamBlockRec pb;

GetVolParmsInfoBuffer volParmsInfo;

if (fakeCD)

return "Fake CD-ROM Device";

pb.ioParam.ioNamePtr = NULL;

pb.ioParam.ioVRefNum = volumes[drive];

pb.ioParam.ioBuffer = (Ptr)&volParmsInfo;

pb.ioParam.ioReqCount = (SInt32)sizeof(volParmsInfo);

err = PBHGetVolParmsSync(&pb);

return NULL;

}

return volParmsInfo.vMDeviceID;

}

/* Open the "device" */

static int SDL_SYS_CDOpen (int drive)

{

/* Only allow 1 device to be open */

if (currentDrive >= 0) {

SDL_SetError ("Only one cdrom is supported");

return -1;

}

else

currentDrive = drive;

return drive;

}

/* Get the table of contents */

static int SDL_SYS_CDGetTOC (SDL_CD *cdrom)

{

if (fakeCD) {

SDL_SetError (kErrorFakeDevice);

return -1;

}

if (didReadTOC) {

cdrom->numtracks = cacheTOCNumTracks;

return 0;

}

ReadTOCData (volumes[cdrom->id], cdrom);

didReadTOC = SDL_TRUE;

cacheTOCNumTracks = cdrom->numtracks;

return 0;

}

/* Get CD-ROM status */

static CDstatus SDL_SYS_CDStatus (SDL_CD *cdrom, int *position)

{

if (position) {

int trackFrame;

Lock ();

trackFrame = GetCurrentFrame ();

Unlock ();

*position = cdrom->track[currentTrack].offset + trackFrame;

}

return status;

}

/* Start playback */

static int SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length)

{

int startFrame, stopFrame;

FSRef *ref;

if (fakeCD) {

SDL_SetError (kErrorFakeDevice);

return -1;

}

Lock();

if (LoadTracks (cdrom) < 0)

return -2;

if (PauseFile () < 0)

return -3;

if (ReleaseFile () < 0)

return -4;

ref = GetFileForOffset (cdrom, start, length, &startFrame, &stopFrame);

if (ref == NULL) {

SDL_SetError ("SDL_SYS_CDPlay: No file for start=%d, length=%d", start, length);

return -5;

}

if (LoadFile (ref, startFrame, stopFrame) < 0)

return -6;

SetCompletionProc (CompletionProc, cdrom);

if (PlayFile () < 0)

return -7;

status = CD_PLAYING;

Unlock();

return 0;

}

/* Pause playback */

static int SDL_SYS_CDPause(SDL_CD *cdrom)

{

if (fakeCD) {

SDL_SetError (kErrorFakeDevice);

return -1;

}

Lock ();

if (PauseFile () < 0) {

Unlock ();

status = CD_PAUSED;

Unlock ();

return 0;

}

/* Resume playback */

static int SDL_SYS_CDResume(SDL_CD *cdrom)

{

if (fakeCD) {

SDL_SetError (kErrorFakeDevice);

return -1;

}

Lock ();

status = CD_PLAYING;

Unlock ();

return 0;

}

/* Stop playback */

static int SDL_SYS_CDStop(SDL_CD *cdrom)

{

if (fakeCD) {

SDL_SetError (kErrorFakeDevice);

return -1;

}

Lock ();

if (PauseFile () < 0) {

Unlock ();

if (ReleaseFile () < 0) {

Unlock ();

status = CD_STOPPED;

Unlock ();

return 0;

}

/* Eject the CD-ROM (Unmount the volume) */

static int SDL_SYS_CDEject(SDL_CD *cdrom)

{

OSStatus err;

if (fakeCD) {

SDL_SetError (kErrorFakeDevice);

return -1;

}

Lock ();

if (PauseFile () < 0) {

Unlock ();

if (ReleaseFile () < 0) {

Unlock ();

status = CD_STOPPED;

// Eject the volume

pb.ioParam.ioNamePtr = NULL;

pb.ioParam.ioVRefNum = volumes[cdrom->id];

err = PBUnmountVol((ParamBlockRec *) &pb);

if (err != noErr) {

Unlock ();

SDL_SetError ("PBUnmountVol returned %d", err);

return -4;

}

status = CD_TRAYEMPTY;

/* Invalidate volume and track info */

volumes[cdrom->id] = 0;

free (tracks[cdrom->id]);

tracks[cdrom->id] = NULL;

Unlock ();

return 0;

}

/* Close the CD-ROM */

static void SDL_SYS_CDClose(SDL_CD *cdrom)

{

currentDrive = -1;

return;

}