342 lines
7.3 KiB
C
342 lines
7.3 KiB
C
/*
|
|
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;
|
|
}
|