src/cdrom/freebsd/SDL_syscdrom.c
changeset 0 74212992fb08
child 252 e8157fcb3114
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/cdrom/freebsd/SDL_syscdrom.c	Thu Apr 26 16:45:43 2001 +0000
@@ -0,0 +1,411 @@
+/*
+    SDL - Simple DirectMedia Layer
+    Copyright (C) 1997, 1998, 1999, 2000, 2001  Sam Lantinga
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Library General Public
+    License as published by the Free Software Foundation; either
+    version 2 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
+    Library General Public License for more details.
+
+    You should have received a copy of the GNU Library General Public
+    License along with this library; if not, write to the Free
+    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+    Sam Lantinga
+    slouken@devolution.com
+*/
+
+#ifdef SAVE_RCSID
+static char rcsid =
+ "@(#) $Id$";
+#endif
+
+/* Functions for system-level CD-ROM audio control */
+
+#include <sys/types.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+#include <sys/cdio.h>
+
+#include "SDL_error.h"
+#include "SDL_cdrom.h"
+#include "SDL_syscdrom.h"
+
+
+/* The maximum number of CD-ROM drives we'll detect */
+#define MAX_DRIVES	16	
+
+/* A list of available CD-ROM drives */
+static char *SDL_cdlist[MAX_DRIVES];
+static dev_t SDL_cdmode[MAX_DRIVES];
+
+/* The system-dependent CD control functions */
+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);
+
+/* Some ioctl() errno values which occur when the tray is empty */
+#define ERRNO_TRAYEMPTY(errno)	\
+	((errno == EIO) || (errno == ENOENT) || (errno == EINVAL))
+
+/* Check a drive to see if it is a CD-ROM */
+static int CheckDrive(char *drive, struct stat *stbuf)
+{
+	int is_cd, cdfd;
+	struct ioc_read_subchannel info;
+
+	/* If it doesn't exist, return -1 */
+	if ( stat(drive, stbuf) < 0 ) {
+		return(-1);
+	}
+
+	/* If it does exist, verify that it's an available CD-ROM */
+	is_cd = 0;
+	if ( S_ISCHR(stbuf->st_mode) || S_ISBLK(stbuf->st_mode) ) {
+		cdfd = open(drive, (O_RDONLY|O_EXCL|O_NONBLOCK), 0);
+		if ( cdfd >= 0 ) {
+			info.address_format = CD_MSF_FORMAT;
+			info.data_format = CD_CURRENT_POSITION;
+			info.data_len = 0;
+			info.data = NULL;
+			/* Under Linux, EIO occurs when a disk is not present.
+			   This isn't 100% reliable, so we use the USE_MNTENT
+			   code above instead.
+			 */
+			if ( (ioctl(cdfd, CDIOCREADSUBCHANNEL, &info) == 0) ||
+						ERRNO_TRAYEMPTY(errno) ) {
+				is_cd = 1;
+			}
+			close(cdfd);
+		}
+	}
+	return(is_cd);
+}
+
+/* Add a CD-ROM drive to our list of valid drives */
+static void AddDrive(char *drive, struct stat *stbuf)
+{
+	int i;
+
+	if ( SDL_numcds < MAX_DRIVES ) {
+		/* Check to make sure it's not already in our list.
+	 	   This can happen when we see a drive via symbolic link.
+		 */
+		for ( i=0; i<SDL_numcds; ++i ) {
+			if ( stbuf->st_rdev == SDL_cdmode[i] ) {
+#ifdef DEBUG_CDROM
+  fprintf(stderr, "Duplicate drive detected: %s == %s\n", drive, SDL_cdlist[i]);
+#endif
+				return;
+			}
+		}
+
+		/* Add this drive to our list */
+		i = SDL_numcds;
+		SDL_cdlist[i] = (char *)malloc(strlen(drive)+1);
+		if ( SDL_cdlist[i] == NULL ) {
+			SDL_OutOfMemory();
+			return;
+		}
+		strcpy(SDL_cdlist[i], drive);
+		SDL_cdmode[i] = stbuf->st_rdev;
+		++SDL_numcds;
+#ifdef DEBUG_CDROM
+  fprintf(stderr, "Added CD-ROM drive: %s\n", drive);
+#endif
+	}
+}
+
+int  SDL_SYS_CDInit(void)
+{
+	/* checklist: /dev/cdrom,/dev/cd?c /dev/acd?c
+			/dev/matcd?c /dev/mcd?c /dev/scd?c */
+	static char *checklist[] = {
+	"cdrom", "?0 cd?", "?0 acd?", "?0 matcd?", "?0 mcd?", "?0 scd?",NULL
+	};
+	char *SDLcdrom;
+	int i, j, exists;
+	char drive[32];
+	struct stat stbuf;
+
+	/* Fill in our driver capabilities */
+	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;
+
+	/* Look in the environment for our CD-ROM drive list */
+	SDLcdrom = getenv("SDL_CDROM");	/* ':' separated list of devices */
+	if ( SDLcdrom != NULL ) {
+		char *cdpath, *delim;
+		cdpath = malloc(strlen(SDLcdrom)+1);
+		if ( cdpath != NULL ) {
+			strcpy(cdpath, SDLcdrom);
+			SDLcdrom = cdpath;
+			do {
+				delim = strchr(SDLcdrom, ':');
+				if ( delim ) {
+					*delim++ = '\0';
+				}
+				if ( CheckDrive(SDLcdrom, &stbuf) > 0 ) {
+					AddDrive(SDLcdrom, &stbuf);
+				}
+				if ( delim ) {
+					SDLcdrom = delim;
+				} else {
+					SDLcdrom = NULL;
+				}
+			} while ( SDLcdrom );
+			free(cdpath);
+		}
+
+		/* If we found our drives, there's nothing left to do */
+		if ( SDL_numcds > 0 ) {
+			return(0);
+		}
+	}
+
+	/* Scan the system for CD-ROM drives */
+	for ( i=0; checklist[i]; ++i ) {
+		if ( checklist[i][0] == '?' ) {
+			char *insert;
+			exists = 1;
+			for ( j=checklist[i][1]; exists; ++j ) {
+				sprintf(drive, "/dev/%sc", &checklist[i][3]);
+				insert = strchr(drive, '?');
+				if ( insert != NULL ) {
+					*insert = j;
+				}
+				switch (CheckDrive(drive, &stbuf)) {
+					/* Drive exists and is a CD-ROM */
+					case 1:
+						AddDrive(drive, &stbuf);
+						break;
+					/* Drive exists, but isn't a CD-ROM */
+					case 0:
+						break;
+					/* Drive doesn't exist */
+					case -1:
+						exists = 0;
+						break;
+				}
+			}
+		} else {
+			sprintf(drive, "/dev/%s", checklist[i]);
+			if ( CheckDrive(drive, &stbuf) > 0 ) {
+				AddDrive(drive, &stbuf);
+			}
+		}
+	}
+	return(0);
+}
+
+/* General ioctl() CD-ROM command function */
+static int SDL_SYS_CDioctl(int id, int command, void *arg)
+{
+	int retval;
+
+	retval = ioctl(id, command, arg);
+	if ( retval < 0 ) {
+		SDL_SetError("ioctl() error: %s", strerror(errno));
+	}
+	return(retval);
+}
+
+static const char *SDL_SYS_CDName(int drive)
+{
+	return(SDL_cdlist[drive]);
+}
+
+static int SDL_SYS_CDOpen(int drive)
+{
+	return(open(SDL_cdlist[drive], (O_RDONLY|O_EXCL|O_NONBLOCK), 0));
+}
+
+static int SDL_SYS_CDGetTOC(SDL_CD *cdrom)
+{
+	struct ioc_toc_header toc;
+	int i, okay;
+	struct ioc_read_toc_entry entry;
+	struct cd_toc_entry data;
+
+	okay = 0;
+	if ( SDL_SYS_CDioctl(cdrom->id, CDIOREADTOCHEADER, &toc) == 0 ) {
+		cdrom->numtracks = toc.ending_track-toc.starting_track+1;
+		if ( cdrom->numtracks > SDL_MAX_TRACKS ) {
+			cdrom->numtracks = SDL_MAX_TRACKS;
+		}
+		/* Read all the track TOC entries */
+		for ( i=0; i<=cdrom->numtracks; ++i ) {
+			if ( i == cdrom->numtracks ) {
+				cdrom->track[i].id = 0xAA; /* CDROM_LEADOUT */
+			} else {
+				cdrom->track[i].id = toc.starting_track+i;
+			}
+			entry.starting_track = cdrom->track[i].id;
+			entry.address_format = CD_MSF_FORMAT;
+			entry.data_len = sizeof(data);
+			entry.data = &data;
+			if ( SDL_SYS_CDioctl(cdrom->id, CDIOREADTOCENTRYS,
+								&entry) < 0 ) {
+				break;
+			} else {
+				cdrom->track[i].type = data.control;
+				cdrom->track[i].offset = MSF_TO_FRAMES(
+						data.addr.msf.minute,
+						data.addr.msf.second,
+						data.addr.msf.frame);
+				cdrom->track[i].length = 0;
+				if ( i > 0 ) {
+					cdrom->track[i-1].length =
+						cdrom->track[i].offset-
+						cdrom->track[i-1].offset;
+				}
+			}
+		}
+		if ( i == (cdrom->numtracks+1) ) {
+			okay = 1;
+		}
+	}
+	return(okay ? 0 : -1);
+}
+
+/* Get CD-ROM status */
+static CDstatus SDL_SYS_CDStatus(SDL_CD *cdrom, int *position)
+{
+	CDstatus status;
+	struct ioc_toc_header toc;
+	struct ioc_read_subchannel info;
+	struct cd_sub_channel_info data;
+
+	info.address_format = CD_MSF_FORMAT;
+	info.data_format = CD_CURRENT_POSITION;
+	info.track = 0;
+	info.data_len = sizeof(data);
+	info.data = &data;
+	if ( ioctl(cdrom->id, CDIOCREADSUBCHANNEL, &info) < 0 ) {
+		if ( ERRNO_TRAYEMPTY(errno) ) {
+			status = CD_TRAYEMPTY;
+		} else {
+			status = CD_ERROR;
+		}
+	} else {
+		switch (data.header.audio_status) {
+			case CD_AS_AUDIO_INVALID:
+			case CD_AS_NO_STATUS:
+				/* Try to determine if there's a CD available */
+				if (ioctl(cdrom->id,CDIOREADTOCHEADER,&toc)==0)
+					status = CD_STOPPED;
+				else
+					status = CD_TRAYEMPTY;
+				break;
+			case CD_AS_PLAY_COMPLETED:
+				status = CD_STOPPED;
+				break;
+			case CD_AS_PLAY_IN_PROGRESS:
+				status = CD_PLAYING;
+				break;
+			case CD_AS_PLAY_PAUSED:
+				status = CD_PAUSED;
+				break;
+			default:
+				status = CD_ERROR;
+				break;
+		}
+	}
+	if ( position ) {
+		if ( status == CD_PLAYING || (status == CD_PAUSED) ) {
+			*position = MSF_TO_FRAMES(
+					data.what.position.absaddr.msf.minute,
+					data.what.position.absaddr.msf.second,
+					data.what.position.absaddr.msf.frame);
+		} else {
+			*position = 0;
+		}
+	}
+	return(status);
+}
+
+/* Start play */
+static int SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length)
+{
+	struct ioc_play_msf playtime;
+
+	FRAMES_TO_MSF(start,
+		&playtime.start_m, &playtime.start_s, &playtime.start_f);
+	FRAMES_TO_MSF(start+length,
+		&playtime.end_m, &playtime.end_s, &playtime.end_f);
+#ifdef DEBUG_CDROM
+  fprintf(stderr, "Trying to play from %d:%d:%d to %d:%d:%d\n",
+	playtime.cdmsf_min0, playtime.cdmsf_sec0, playtime.cdmsf_frame0,
+	playtime.cdmsf_min1, playtime.cdmsf_sec1, playtime.cdmsf_frame1);
+#endif
+	ioctl(cdrom->id, CDIOCSTART, 0);
+	return(SDL_SYS_CDioctl(cdrom->id, CDIOCPLAYMSF, &playtime));
+}
+
+/* Pause play */
+static int SDL_SYS_CDPause(SDL_CD *cdrom)
+{
+	return(SDL_SYS_CDioctl(cdrom->id, CDIOCPAUSE, 0));
+}
+
+/* Resume play */
+static int SDL_SYS_CDResume(SDL_CD *cdrom)
+{
+	return(SDL_SYS_CDioctl(cdrom->id, CDIOCRESUME, 0));
+}
+
+/* Stop play */
+static int SDL_SYS_CDStop(SDL_CD *cdrom)
+{
+	return(SDL_SYS_CDioctl(cdrom->id, CDIOCSTOP, 0));
+}
+
+/* Eject the CD-ROM */
+static int SDL_SYS_CDEject(SDL_CD *cdrom)
+{
+	return(SDL_SYS_CDioctl(cdrom->id, CDIOCEJECT, 0));
+}
+
+/* Close the CD-ROM handle */
+static void SDL_SYS_CDClose(SDL_CD *cdrom)
+{
+	close(cdrom->id);
+}
+
+void SDL_SYS_CDQuit(void)
+{
+	int i;
+
+	if ( SDL_numcds > 0 ) {
+		for ( i=0; i<SDL_numcds; ++i ) {
+			free(SDL_cdlist[i]);
+		}
+		SDL_numcds = 0;
+	}
+}
+