Skip to content
Permalink
Branch: master
Find file Copy path
Find file Copy path
Fetching contributors…
Cannot retrieve contributors at this time
341 lines (300 sloc) 7.31 KB
/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997-2012 Sam Lantinga
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
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
Lesser General Public License for more details.
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_config.h"
/* This is the CD-audio control API for Simple DirectMedia Layer */
#include "SDL_cdrom.h"
#include "SDL_syscdrom.h"
#if !defined(__MACOS__)
#define CLIP_FRAMES 10 /* Some CD-ROMs won't go all the way */
#endif
static int SDL_cdinitted = 0;
static SDL_CD *default_cdrom;
/* The system level CD-ROM control functions */
struct CDcaps SDL_CDcaps = {
NULL, /* Name */
NULL, /* Open */
NULL, /* GetTOC */
NULL, /* Status */
NULL, /* Play */
NULL, /* Pause */
NULL, /* Resume */
NULL, /* Stop */
NULL, /* Eject */
NULL, /* Close */
};
int SDL_numcds;
int SDL_CDROMInit(void)
{
int retval;
SDL_numcds = 0;
retval = SDL_SYS_CDInit();
if ( retval == 0 ) {
SDL_cdinitted = 1;
}
default_cdrom = NULL;
return(retval);
}
/* Check to see if the CD-ROM subsystem has been initialized */
static int CheckInit(int check_cdrom, SDL_CD **cdrom)
{
int okay;
okay = SDL_cdinitted;
if ( check_cdrom && (*cdrom == NULL) ) {
*cdrom = default_cdrom;
if ( *cdrom == NULL ) {
SDL_SetError("CD-ROM not opened");
okay = 0;
}
}
if ( ! SDL_cdinitted ) {
SDL_SetError("CD-ROM subsystem not initialized");
}
return(okay);
}
int SDL_CDNumDrives(void)
{
if ( ! CheckInit(0, NULL) ) {
return(-1);
}
return(SDL_numcds);
}
const char *SDL_CDName(int drive)
{
if ( ! CheckInit(0, NULL) ) {
return(NULL);
}
if ( drive >= SDL_numcds ) {
SDL_SetError("Invalid CD-ROM drive index");
return(NULL);
}
if ( SDL_CDcaps.Name ) {
return(SDL_CDcaps.Name(drive));
} else {
return("");
}
}
SDL_CD *SDL_CDOpen(int drive)
{
struct SDL_CD *cdrom;
if ( ! CheckInit(0, NULL) ) {
return(NULL);
}
if ( drive >= SDL_numcds ) {
SDL_SetError("Invalid CD-ROM drive index");
return(NULL);
}
cdrom = (SDL_CD *)SDL_malloc(sizeof(*cdrom));
if ( cdrom == NULL ) {
SDL_OutOfMemory();
return(NULL);
}
SDL_memset(cdrom, 0, sizeof(*cdrom));
cdrom->id = SDL_CDcaps.Open(drive);
if ( cdrom->id < 0 ) {
SDL_free(cdrom);
return(NULL);
}
default_cdrom = cdrom;
return(cdrom);
}
CDstatus SDL_CDStatus(SDL_CD *cdrom)
{
CDstatus status;
int i;
Uint32 position;
/* Check if the CD-ROM subsystem has been initialized */
if ( ! CheckInit(1, &cdrom) ) {
return(CD_ERROR);
}
/* Get the current status of the drive */
cdrom->numtracks = 0;
cdrom->cur_track = 0;
cdrom->cur_frame = 0;
status = SDL_CDcaps.Status(cdrom, &i);
position = (Uint32)i;
cdrom->status = status;
/* Get the table of contents, if there's a CD available */
if ( CD_INDRIVE(status) ) {
if ( SDL_CDcaps.GetTOC(cdrom) < 0 ) {
status = CD_ERROR;
}
/* If the drive is playing, get current play position */
if ( (status == CD_PLAYING) || (status == CD_PAUSED) ) {
for ( i=1; cdrom->track[i].offset <= position; ++i ) {
/* Keep looking */;
}
#ifdef DEBUG_CDROM
fprintf(stderr, "Current position: %d, track = %d (offset is %d)\n",
position, i-1, cdrom->track[i-1].offset);
#endif
cdrom->cur_track = i-1;
position -= cdrom->track[cdrom->cur_track].offset;
cdrom->cur_frame = position;
}
}
return(status);
}
int SDL_CDPlayTracks(SDL_CD *cdrom,
int strack, int sframe, int ntracks, int nframes)
{
int etrack, eframe;
int start, length;
/* Check if the CD-ROM subsystem has been initialized */
if ( ! CheckInit(1, &cdrom) ) {
return(CD_ERROR);
}
/* Determine the starting and ending tracks */
if ( (strack < 0) || (strack >= cdrom->numtracks) ) {
SDL_SetError("Invalid starting track");
return(CD_ERROR);
}
if ( ! ntracks && ! nframes ) {
etrack = cdrom->numtracks;
eframe = 0;
} else {
etrack = strack+ntracks;
if ( etrack == strack ) {
eframe = sframe + nframes;
} else {
eframe = nframes;
}
}
if ( etrack > cdrom->numtracks ) {
SDL_SetError("Invalid play length");
return(CD_ERROR);
}
/* Skip data tracks and verify frame offsets */
while ( (strack <= etrack) &&
(cdrom->track[strack].type == SDL_DATA_TRACK) ) {
++strack;
}
if ( sframe >= (int)cdrom->track[strack].length ) {
SDL_SetError("Invalid starting frame for track %d", strack);
return(CD_ERROR);
}
while ( (etrack > strack) &&
(cdrom->track[etrack-1].type == SDL_DATA_TRACK) ) {
--etrack;
}
if ( eframe > (int)cdrom->track[etrack].length ) {
SDL_SetError("Invalid ending frame for track %d", etrack);
return(CD_ERROR);
}
/* Determine start frame and play length */
start = (cdrom->track[strack].offset+sframe);
length = (cdrom->track[etrack].offset+eframe)-start;
#ifdef CLIP_FRAMES
/* I've never seen this necessary, but xmcd does it.. */
length -= CLIP_FRAMES; /* CLIP_FRAMES == 10 */
#endif
if ( length < 0 ) {
return(0);
}
/* Play! */
#ifdef DEBUG_CDROM
fprintf(stderr, "Playing %d frames at offset %d\n", length, start);
#endif
return(SDL_CDcaps.Play(cdrom, start, length));
}
int SDL_CDPlay(SDL_CD *cdrom, int sframe, int length)
{
/* Check if the CD-ROM subsystem has been initialized */
if ( ! CheckInit(1, &cdrom) ) {
return(CD_ERROR);
}
return(SDL_CDcaps.Play(cdrom, sframe, length));
}
int SDL_CDPause(SDL_CD *cdrom)
{
CDstatus status;
int retval;
/* Check if the CD-ROM subsystem has been initialized */
if ( ! CheckInit(1, &cdrom) ) {
return(CD_ERROR);
}
status = SDL_CDcaps.Status(cdrom, NULL);
switch (status) {
case CD_PLAYING:
retval = SDL_CDcaps.Pause(cdrom);
break;
default:
retval = 0;
break;
}
return(retval);
}
int SDL_CDResume(SDL_CD *cdrom)
{
CDstatus status;
int retval;
/* Check if the CD-ROM subsystem has been initialized */
if ( ! CheckInit(1, &cdrom) ) {
return(CD_ERROR);
}
status = SDL_CDcaps.Status(cdrom, NULL);
switch (status) {
case CD_PAUSED:
retval = SDL_CDcaps.Resume(cdrom);
default:
retval = 0;
break;
}
return(retval);
}
int SDL_CDStop(SDL_CD *cdrom)
{
CDstatus status;
int retval;
/* Check if the CD-ROM subsystem has been initialized */
if ( ! CheckInit(1, &cdrom) ) {
return(CD_ERROR);
}
status = SDL_CDcaps.Status(cdrom, NULL);
switch (status) {
case CD_PLAYING:
case CD_PAUSED:
retval = SDL_CDcaps.Stop(cdrom);
default:
retval = 0;
break;
}
return(retval);
}
int SDL_CDEject(SDL_CD *cdrom)
{
/* Check if the CD-ROM subsystem has been initialized */
if ( ! CheckInit(1, &cdrom) ) {
return(CD_ERROR);
}
return(SDL_CDcaps.Eject(cdrom));
}
void SDL_CDClose(SDL_CD *cdrom)
{
/* Check if the CD-ROM subsystem has been initialized */
if ( ! CheckInit(1, &cdrom) ) {
return;
}
SDL_CDcaps.Close(cdrom);
SDL_free(cdrom);
default_cdrom = NULL;
}
void SDL_CDROMQuit(void)
{
SDL_SYS_CDQuit();
SDL_cdinitted = 0;
}
You can’t perform that action at this time.