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SDL_cdrom.c
357 lines (314 loc) · 8.41 KB
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/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2009 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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*/
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#include "SDL_config.h"
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/* This is the CD-audio control API for Simple DirectMedia Layer */
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#include "SDL_cdrom.h"
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#include "SDL_syscdrom.h"
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#define CLIP_FRAMES 10 /* Some CD-ROMs won't go all the way */
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static int SDL_cdinitted = 0;
static SDL_CD *default_cdrom;
/* The system level CD-ROM control functions */
struct CDcaps SDL_CDcaps = {
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NULL, /* Name */
NULL, /* Open */
NULL, /* GetTOC */
NULL, /* Status */
NULL, /* Play */
NULL, /* Pause */
NULL, /* Resume */
NULL, /* Stop */
NULL, /* Eject */
NULL, /* Close */
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};
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int SDL_numcds;
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int
SDL_CDROMInit(void)
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{
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int retval;
SDL_numcds = 0;
retval = SDL_SYS_CDInit();
if (retval == 0) {
SDL_cdinitted = 1;
}
default_cdrom = NULL;
return (retval);
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}
/* Check to see if the CD-ROM subsystem has been initialized */
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static int
CheckInit(int check_cdrom, SDL_CD ** cdrom)
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{
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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);
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}
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int
SDL_CDNumDrives(void)
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{
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if (!CheckInit(0, NULL)) {
return (-1);
}
return (SDL_numcds);
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}
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const char *
SDL_CDName(int drive)
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{
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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 ("");
}
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}
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SDL_CD *
SDL_CDOpen(int drive)
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{
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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);
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}
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CDstatus
SDL_CDStatus(SDL_CD * cdrom)
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{
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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 */ ;
}
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#ifdef DEBUG_CDROM
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fprintf(stderr,
"Current position: %d, track = %d (offset is %d)\n",
position, i - 1, cdrom->track[i - 1].offset);
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#endif
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cdrom->cur_track = i - 1;
position -= cdrom->track[cdrom->cur_track].offset;
cdrom->cur_frame = position;
}
}
return (status);
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}
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int
SDL_CDPlayTracks(SDL_CD * cdrom,
int strack, int sframe, int ntracks, int nframes)
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{
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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;
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#ifdef CLIP_FRAMES
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/* I've never seen this necessary, but xmcd does it.. */
length -= CLIP_FRAMES; /* CLIP_FRAMES == 10 */
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#endif
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if (length < 0) {
return (0);
}
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/* Play! */
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#ifdef DEBUG_CDROM
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fprintf(stderr, "Playing %d frames at offset %d\n", length, start);
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#endif
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return (SDL_CDcaps.Play(cdrom, start, length));
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}
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int
SDL_CDPlay(SDL_CD * cdrom, int sframe, int length)
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{
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/* Check if the CD-ROM subsystem has been initialized */
if (!CheckInit(1, &cdrom)) {
return (CD_ERROR);
}
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return (SDL_CDcaps.Play(cdrom, sframe, length));
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}
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int
SDL_CDPause(SDL_CD * cdrom)
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{
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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);
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}
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int
SDL_CDResume(SDL_CD * cdrom)
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{
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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);
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}
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int
SDL_CDStop(SDL_CD * cdrom)
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{
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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);
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}
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int
SDL_CDEject(SDL_CD * cdrom)
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{
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/* Check if the CD-ROM subsystem has been initialized */
if (!CheckInit(1, &cdrom)) {
return (CD_ERROR);
}
return (SDL_CDcaps.Eject(cdrom));
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}
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void
SDL_CDClose(SDL_CD * cdrom)
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{
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/* Check if the CD-ROM subsystem has been initialized */
if (!CheckInit(1, &cdrom)) {
return;
}
SDL_CDcaps.Close(cdrom);
SDL_free(cdrom);
default_cdrom = NULL;
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}
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void
SDL_CDROMQuit(void)
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{
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SDL_SYS_CDQuit();
SDL_cdinitted = 0;
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}
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/* vi: set ts=4 sw=4 expandtab: */