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--HG-- extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%40617
This commit is contained in:
Sam Lantinga
parent
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commit
e2b0c74800
1 changed files with 484 additions and 0 deletions
484
src/cdrom/macosx/SDL_syscdrom.c
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484
src/cdrom/macosx/SDL_syscdrom.c
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/*
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SDL - Simple DirectMedia Layer
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Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 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 Library General Public
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License as published by the Free Software Foundation; either
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version 2 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,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the Free
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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Sam Lantinga
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slouken@libsdl.org
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*/
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#ifdef SAVE_RCSID
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static char rcsid =
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"@(#) $Id$";
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#endif
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#include "SDL_syscdrom_c.h"
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#pragma mark -- Globals --
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static FSRef** tracks;
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static FSVolumeRefNum* volumes;
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static CDstatus status;
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static int nextTrackFrame;
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static int nextTrackFramesRemaining;
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static int fakeCD;
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static int currentTrack;
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static int didReadTOC;
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static int cacheTOCNumTracks;
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static int currentDrive; /* Only allow 1 drive in use at a time */
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#pragma mark -- Prototypes --
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static const char *SDL_SYS_CDName (int drive);
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static int SDL_SYS_CDOpen (int drive);
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static int SDL_SYS_CDGetTOC (SDL_CD *cdrom);
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static CDstatus SDL_SYS_CDStatus (SDL_CD *cdrom, int *position);
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static int SDL_SYS_CDPlay (SDL_CD *cdrom, int start, int length);
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static int SDL_SYS_CDPause (SDL_CD *cdrom);
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static int SDL_SYS_CDResume (SDL_CD *cdrom);
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static int SDL_SYS_CDStop (SDL_CD *cdrom);
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static int SDL_SYS_CDEject (SDL_CD *cdrom);
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static void SDL_SYS_CDClose (SDL_CD *cdrom);
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#pragma mark -- Helper Functions --
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/* Read a list of tracks from the volume */
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static int LoadTracks (SDL_CD *cdrom)
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{
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/* Check if tracks are already loaded */
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if ( tracks[cdrom->id] != NULL )
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return 0;
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/* Allocate memory for tracks */
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tracks[cdrom->id] = (FSRef*) calloc (1, sizeof(**tracks) * cdrom->numtracks);
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if (tracks[cdrom->id] == NULL) {
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SDL_OutOfMemory ();
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return -1;
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}
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/* Load tracks */
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if (ListTrackFiles (volumes[cdrom->id], tracks[cdrom->id], cdrom->numtracks) < 0)
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return -1;
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return 0;
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}
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/* Find a file for a given start frame and length */
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static FSRef* GetFileForOffset (SDL_CD *cdrom, int start, int length, int *outStartFrame, int *outStopFrame)
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{
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int i;
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for (i = 0; i < cdrom->numtracks; i++) {
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if (cdrom->track[i].offset <= start &&
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start < (cdrom->track[i].offset + cdrom->track[i].length))
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break;
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}
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if (i == cdrom->numtracks)
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return NULL;
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currentTrack = i;
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*outStartFrame = start - cdrom->track[i].offset;
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if ((*outStartFrame + length) < cdrom->track[i].length) {
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*outStopFrame = *outStartFrame + length;
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length = 0;
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nextTrackFrame = -1;
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nextTrackFramesRemaining = -1;
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}
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else {
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*outStopFrame = -1;
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length -= cdrom->track[i].length - *outStartFrame;
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nextTrackFrame = cdrom->track[i+1].offset;
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nextTrackFramesRemaining = length;
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}
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return &tracks[cdrom->id][i];
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}
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/* Setup another file for playback, or stop playback (called from another thread) */
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static void CompletionProc (SDL_CD *cdrom)
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{
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Lock ();
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if (nextTrackFrame > 0 && nextTrackFramesRemaining > 0) {
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/* Load the next file to play */
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int startFrame, stopFrame;
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FSRef *file;
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PauseFile ();
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ReleaseFile ();
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file = GetFileForOffset (cdrom, nextTrackFrame,
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nextTrackFramesRemaining, &startFrame, &stopFrame);
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if (file == NULL) {
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status = CD_STOPPED;
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Unlock ();
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return;
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}
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LoadFile (file, startFrame, stopFrame);
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SetCompletionProc (CompletionProc, cdrom);
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PlayFile ();
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}
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else {
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/* Release the current file */
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PauseFile ();
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ReleaseFile ();
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status = CD_STOPPED;
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}
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Unlock ();
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}
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#pragma mark -- Driver Functions --
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/* Initialize */
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int SDL_SYS_CDInit (void)
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{
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/* Initialize globals */
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volumes = NULL;
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tracks = NULL;
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status = CD_STOPPED;
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nextTrackFrame = -1;
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nextTrackFramesRemaining = -1;
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fakeCD = SDL_FALSE;
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currentTrack = -1;
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didReadTOC = SDL_FALSE;
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cacheTOCNumTracks = -1;
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currentDrive = -1;
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/* Fill in function pointers */
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SDL_CDcaps.Name = SDL_SYS_CDName;
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SDL_CDcaps.Open = SDL_SYS_CDOpen;
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SDL_CDcaps.GetTOC = SDL_SYS_CDGetTOC;
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SDL_CDcaps.Status = SDL_SYS_CDStatus;
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SDL_CDcaps.Play = SDL_SYS_CDPlay;
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SDL_CDcaps.Pause = SDL_SYS_CDPause;
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SDL_CDcaps.Resume = SDL_SYS_CDResume;
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SDL_CDcaps.Stop = SDL_SYS_CDStop;
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SDL_CDcaps.Eject = SDL_SYS_CDEject;
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SDL_CDcaps.Close = SDL_SYS_CDClose;
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/*
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Read the list of "drives"
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This is currently a hack that infers drives from
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mounted audio CD volumes, rather than
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actual CD-ROM devices - which means it may not
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act as expected sometimes.
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*/
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/* Find out how many cd volumes are mounted */
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SDL_numcds = DetectAudioCDVolumes (NULL, 0);
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/*
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If there are no volumes, fake a cd device
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so tray empty can be reported.
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*/
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if (SDL_numcds == 0) {
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fakeCD = SDL_TRUE;
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SDL_numcds = 1;
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status = CD_TRAYEMPTY;
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return 0;
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}
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/* Allocate space for volumes */
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volumes = (FSVolumeRefNum*) calloc (1, sizeof(*volumes) * SDL_numcds);
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if (volumes == NULL) {
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SDL_OutOfMemory ();
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return -1;
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}
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/* Allocate space for tracks */
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tracks = (FSRef**) calloc (1, sizeof(*tracks) * (SDL_numcds + 1));
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if (tracks == NULL) {
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SDL_OutOfMemory ();
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return -1;
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}
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/* Mark the end of the tracks array */
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tracks[ SDL_numcds ] = (FSRef*)-1;
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/*
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Redetect, now save all volumes for later
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Update SDL_numcds just in case it changed
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*/
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{
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int numVolumes = SDL_numcds;
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SDL_numcds = DetectAudioCDVolumes (volumes, numVolumes);
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/* If more cds suddenly show up, ignore them */
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if (SDL_numcds > numVolumes) {
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SDL_SetError ("Some CD's were added but they will be ignored");
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SDL_numcds = numVolumes;
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}
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}
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return 0;
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}
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/* Shutdown and cleanup */
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void SDL_SYS_CDQuit(void)
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{
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ReleaseFile();
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if (volumes != NULL)
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free (volumes);
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if (tracks != NULL) {
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FSRef **ptr;
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for (ptr = tracks; *ptr != (FSRef*)-1; ptr++)
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if (*ptr != NULL)
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free (*ptr);
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free (tracks);
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}
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}
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/* Get the Unix disk name of the volume */
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static const char *SDL_SYS_CDName (int drive)
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{
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CFStringRef diskID;
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OSStatus err = noErr;
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if (fakeCD)
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return "Fake CD-ROM Device";
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err = FSCopyDiskIDForVolume (volumes[drive], &diskID);
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if (err != noErr) {
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SDL_SetError ("FSCopyDiskIDForVolume returned %d", err);
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return NULL;
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}
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return CFStringGetCStringPtr (diskID, 0);
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}
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/* Open the "device" */
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static int SDL_SYS_CDOpen (int drive)
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{
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/* Only allow 1 device to be open */
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if (currentDrive >= 0) {
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SDL_SetError ("Only one cdrom is supported");
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return -1;
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}
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else
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currentDrive = drive;
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return drive;
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}
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/* Get the table of contents */
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static int SDL_SYS_CDGetTOC (SDL_CD *cdrom)
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{
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if (fakeCD) {
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SDL_SetError (kErrorFakeDevice);
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return -1;
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}
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if (didReadTOC) {
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cdrom->numtracks = cacheTOCNumTracks;
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return 0;
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}
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ReadTOCData (volumes[cdrom->id], cdrom);
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didReadTOC = SDL_TRUE;
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cacheTOCNumTracks = cdrom->numtracks;
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return 0;
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}
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/* Get CD-ROM status */
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static CDstatus SDL_SYS_CDStatus (SDL_CD *cdrom, int *position)
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{
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int trackFrame;
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Lock ();
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trackFrame = GetCurrentFrame ();
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Unlock ();
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if (position)
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*position = cdrom->track[currentTrack].offset + trackFrame;
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return status;
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}
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/* Start playback */
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static int SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length)
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{
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int startFrame, stopFrame;
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FSRef *ref;
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if (fakeCD) {
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SDL_SetError (kErrorFakeDevice);
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return -1;
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}
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Lock();
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if (LoadTracks (cdrom) < 0)
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return -2;
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if (PauseFile () < 0)
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return -3;
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if (ReleaseFile () < 0)
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return -4;
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ref = GetFileForOffset (cdrom, start, length, &startFrame, &stopFrame);
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if (ref == NULL) {
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SDL_SetError ("SDL_SYS_CDPlay: No file for start=%d, length=%d", start, length);
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return -5;
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}
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if (LoadFile (ref, startFrame, stopFrame) < 0)
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return -6;
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SetCompletionProc (CompletionProc, cdrom);
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if (PlayFile () < 0)
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return -7;
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status = CD_PLAYING;
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Unlock();
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return 0;
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}
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/* Pause playback */
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static int SDL_SYS_CDPause(SDL_CD *cdrom)
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{
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if (fakeCD) {
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SDL_SetError (kErrorFakeDevice);
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return -1;
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}
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Lock ();
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if (PauseFile () < 0)
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return -2;
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status = CD_PAUSED;
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Unlock ();
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return 0;
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}
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/* Resume playback */
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static int SDL_SYS_CDResume(SDL_CD *cdrom)
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{
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if (fakeCD) {
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SDL_SetError (kErrorFakeDevice);
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return -1;
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}
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Lock ();
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if (PlayFile () < 0)
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return -2;
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status = CD_PLAYING;
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Unlock ();
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return 0;
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}
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/* Stop playback */
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static int SDL_SYS_CDStop(SDL_CD *cdrom)
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{
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if (fakeCD) {
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SDL_SetError (kErrorFakeDevice);
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return -1;
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}
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Lock ();
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if (PauseFile () < 0)
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return -2;
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if (ReleaseFile () < 0)
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return -3;
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status = CD_STOPPED;
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Unlock ();
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return 0;
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}
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/* Eject the CD-ROM (Unmount the volume) */
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static int SDL_SYS_CDEject(SDL_CD *cdrom)
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{
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OSStatus err;
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if (fakeCD) {
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SDL_SetError (kErrorFakeDevice);
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return -1;
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}
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Lock ();
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if (PauseFile () < 0)
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return -2;
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if (ReleaseFile () < 0)
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return -3;
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status = CD_STOPPED;
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err = FSEjectVolumeSync (volumes[cdrom->id], 0, NULL);
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if (err != noErr) {
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SDL_SetError ("FSEjectVolumeSync returned %d", err);
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return -4;
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}
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status = CD_TRAYEMPTY;
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/* Invalidate volume and track info */
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volumes[cdrom->id] = 0;
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free (tracks[cdrom->id]);
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tracks[cdrom->id] = NULL;
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Unlock ();
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return 0;
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}
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/* Close the CD-ROM */
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static void SDL_SYS_CDClose(SDL_CD *cdrom)
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{
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currentDrive = -1;
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return;
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}
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