src/cdrom/freebsd/SDL_syscdrom.c
author Sam Lantinga <slouken@libsdl.org>
Thu, 06 May 2004 15:55:06 +0000
changeset 886 05c551e5bc64
parent 769 b8d311d90021
child 1312 c9b51268668f
permissions -rw-r--r--
Date: Sat, 24 Apr 2004 15:13:32 +0300 From: "Mike Gorchak" Subject: SDL updates for the QNX6 1. Updated the README.QNX 2. Updated libtool scripts, which are shipped with SDL for QNX6 support. 3. Added some code to support the new QNX 6.3.0, which is in beta now. 4. Added code to detect the hw features, which driver supports. 5. Added hw alpha blits code. 6. Fixed bug when application switches to fullscreen more the 2 times. (afte\ r that window becames always stay on top). 7. Updated a bit README for the tests. 8. Added information about acceleration show in the testalpha.c test. 9. Added small fixes to the testoverlay2.c test. 10. Added alpha and cc+alpha blits benchmarks to the testvidinfo.c test.

/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2004 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@libsdl.org
*/

#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;
	}
}