SDL_syscdrom.c
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上传用户:sun1608
上传日期:2007-02-02
资源大小:6116k
文件大小:18k
源码类别:
流媒体/Mpeg4/MP4
开发平台:
Visual C++
- /*
- AIX audio module for SDL (Simple DirectMedia Layer)
- Copyright (C) 2000 Carsten Griwodz
- 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
- Carsten Griwodz
- griff@kom.tu-darmstadt.de
- based on linux/SDL_syscdrom.c by Sam Lantinga
- */
- #ifdef SAVE_RCSID
- static char rcsid =
- "@(#) $Id: SDL_syscdrom.c,v 1.2 2002/04/22 21:38:02 wmay Exp $";
- #endif
- /* Functions for system-level CD-ROM audio control */
- #define DEBUG_CDROM 1
- #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/ioctl.h>
- #include <sys/devinfo.h>
- #include <sys/mntctl.h>
- #include <sys/statfs.h>
- #include <sys/vmount.h>
- #include <fstab.h>
- #include <sys/scdisk.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);
- static int SDL_SYS_CDioctl(int id, int command, void *arg);
- /* Check a drive to see if it is a CD-ROM */
- static int CheckDrive(char *drive, struct stat *stbuf)
- {
- int is_cd;
- int cdfd;
- int ret;
- struct devinfo 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 ) {
- ret = SDL_SYS_CDioctl( cdfd, IOCINFO, &info );
- if ( ret < 0 ) {
- /* Some kind of error */
- is_cd = 0;
- } else {
- if ( info.devtype == DD_CDROM ) {
- is_cd = 1;
- } else {
- is_cd = 0;
- }
- }
- close(cdfd);
- }
- #ifdef DEBUG_CDROM
- else
- {
- fprintf(stderr, "Could not open drive %s (%s)n", drive, strerror(errno));
- }
- #endif
- }
- 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 == %sn", 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: %sn", drive);
- #endif
- }
- }
- static void CheckMounts()
- {
- char* buffer;
- int bufsz;
- struct vmount* ptr;
- int ret;
- buffer = (char*)malloc(10);
- bufsz = 10;
- if ( buffer==NULL )
- {
- fprintf(stderr, "Could not allocate 10 bytes in aix/SDL_syscdrom.c:CheckMountsn" );
- exit ( -10 );
- }
- do
- {
- /* mntctrl() returns an array of all mounted filesystems */
- ret = mntctl ( MCTL_QUERY, bufsz, buffer );
- if ( ret == 0 )
- {
- /* Buffer was too small, realloc. */
- bufsz = *(int*)buffer; /* Required size is in first word. */
- /* (whatever a word is in AIX 4.3.3) */
- /* int seems to be OK in 32bit mode. */
- free(buffer);
- buffer = (char*)malloc(bufsz);
- if ( buffer==NULL )
- {
- fprintf(stderr,
- "Could not allocate %d bytes in aix/SDL_syscdrom.c:CheckMountsn",
- bufsz );
- exit ( -10 );
- }
- }
- else if ( ret < 0 )
- {
- #ifdef DEBUG_CDROM
- fprintf(stderr, "Error reading vmount structuresn");
- #endif
- return;
- }
- }
- while ( ret == 0 );
- #ifdef DEBUG_CDROM
- fprintf ( stderr, "Read %d vmount structuresn",ret );
- #endif
- ptr = (struct vmount*)buffer;
- do
- {
- switch(ptr->vmt_gfstype)
- {
- case MNT_CDROM :
- {
- struct stat stbuf;
- char* text;
- text = (char*)ptr + ptr->vmt_data[VMT_OBJECT].vmt_off;
- #ifdef DEBUG_CDROM
- fprintf(stderr, "Checking mount path: %s mounted on %sn",
- text, (char*)ptr + ptr->vmt_data[VMT_STUB].vmt_off );
- #endif
- if ( CheckDrive( text, &stbuf) > 0)
- {
- AddDrive( text, &stbuf);
- }
- }
- break;
- default :
- break;
- }
- ptr = (struct vmount*)((char*)ptr + ptr->vmt_length);
- ret--;
- }
- while ( ret > 0 );
- free ( buffer );
- }
- static int CheckNonmounts()
- {
- #ifdef _THREAD_SAFE
- AFILE_t fsFile = NULL;
- int passNo = 0;
- int ret;
- struct fstab entry;
- struct stat stbuf;
- ret = setfsent_r( &fsFile, &passNo );
- if ( ret != 0 ) return -1;
- do
- {
- ret = getfsent_r ( &entry, &fsFile, &passNo );
- if ( ret == 0 ) {
- char* l = strrchr(entry.fs_spec,'/');
- if ( l != NULL ) {
- if ( !strncmp("cd",++l,2) ) {
- #ifdef DEBUG_CDROM
- fprintf(stderr,
- "Found unmounted CD ROM drive with device name %sn",
- entry.fs_spec);
- #endif
- if ( CheckDrive( entry.fs_spec, &stbuf) > 0)
- {
- AddDrive( entry.fs_spec, &stbuf);
- }
- }
- }
- }
- }
- while ( ret == 0 );
- ret = endfsent_r ( &fsFile );
- if ( ret != 0 ) return -1;
- return 0;
- #else
- struct fstab* entry;
- struct stat stbuf;
- setfsent();
- do
- {
- entry = getfsent();
- if ( entry != NULL ) {
- char* l = strrchr(entry->fs_spec,'/');
- if ( l != NULL ) {
- if ( !strncmp("cd",++l,2) ) {
- #ifdef DEBUG_CDROM
- fprintf(stderr,"Found unmounted CD ROM drive with device name %s", entry->fs_spec);
- #endif
- if ( CheckDrive( entry->fs_spec, &stbuf) > 0)
- {
- AddDrive( entry->fs_spec, &stbuf);
- }
- }
- }
- }
- }
- while ( entry != NULL );
- endfsent();
- #endif
- }
- int SDL_SYS_CDInit(void)
- {
- char *SDLcdrom;
- 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++ = ' ';
- }
- #ifdef DEBUG_CDROM
- fprintf(stderr, "Checking CD-ROM drive from SDL_CDROM: %sn", SDLcdrom);
- #endif
- 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);
- }
- }
- CheckMounts();
- CheckNonmounts();
- 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)
- {
- int fd;
- char* lastsl;
- char* cdromname;
- /*
- * We found /dev/cd? drives and that is in our list. But we can
- * open only the /dev/rcd? versions of those devices for Audio CD.
- */
- cdromname = (char*)malloc( strlen(SDL_cdlist[drive]+2) );
- strcpy(cdromname,SDL_cdlist[drive]);
- lastsl = strrchr(cdromname,'/');
- if (lastsl) {
- *lastsl = 0;
- strcat(cdromname,"/r");
- lastsl = strrchr(SDL_cdlist[drive],'/');
- if (lastsl) {
- lastsl++;
- strcat(cdromname,lastsl);
- }
- }
- #ifdef DEBUG_CDROM
- fprintf(stderr, "Should open drive %s, opening %sn", SDL_cdlist[drive], cdromname);
- #endif
- /*
- * Use exclusive access. Don't use SC_DIAGNOSTICS as xmcd does because they
- * require root priviledges, and we don't want that. SC_SINGLE provides
- * exclusive access with less trouble.
- */
- fd = openx(cdromname, O_RDONLY, NULL, SC_SINGLE);
- if ( fd < 0 )
- {
- #ifdef DEBUG_CDROM
- fprintf(stderr, "Could not open drive %s (%s)n", cdromname, strerror(errno));
- #endif
- }
- else
- {
- struct mode_form_op cdMode;
- int ret;
- #ifdef DEBUG_CDROM
- cdMode.action = CD_GET_MODE;
- ret = SDL_SYS_CDioctl(fd, DK_CD_MODE, &cdMode);
- if ( ret < 0 ) {
- fprintf(stderr,
- "Could not get drive mode for %s (%s)n",
- cdromname, strerror(errno));
- } else {
- switch(cdMode.cd_mode_form) {
- case CD_MODE1 :
- fprintf(stderr,
- "Drive mode for %s is %sn",
- cdromname, "CD-ROM Data Mode 1");
- break;
- case CD_MODE2_FORM1 :
- fprintf(stderr,
- "Drive mode for %s is %sn",
- cdromname, "CD-ROM XA Data Mode 2 Form 1");
- break;
- case CD_MODE2_FORM2 :
- fprintf(stderr,
- "Drive mode for %s is %sn",
- cdromname, "CD-ROM XA Data Mode 2 Form 2");
- break;
- case CD_DA :
- fprintf(stderr,
- "Drive mode for %s is %sn",
- cdromname, "CD-DA");
- break;
- default :
- fprintf(stderr,
- "Drive mode for %s is %sn",
- cdromname, "unknown");
- break;
- }
- }
- #endif
- cdMode.action = CD_CHG_MODE;
- cdMode.cd_mode_form = CD_DA;
- ret = SDL_SYS_CDioctl(fd, DK_CD_MODE, &cdMode);
- if ( ret < 0 ) {
- #ifdef DEBUG_CDROM
- fprintf(stderr,
- "Could not set drive mode for %s (%s)n",
- cdromname, strerror(errno));
- #endif
- SDL_SetError("ioctl() error: Could not set CD drive mode, %s",
- strerror(errno));
- } else {
- #ifdef DEBUG_CDROM
- fprintf(stderr,
- "Drive mode for %s set to CD_DAn",
- cdromname);
- #endif
- }
- }
- free(cdromname);
- return fd;
- }
- static int SDL_SYS_CDGetTOC(SDL_CD *cdrom)
- {
- struct cd_audio_cmd cmd;
- struct cd_audio_cmd entry;
- int i;
- int okay;
- cmd.audio_cmds = CD_TRK_INFO_AUDIO;
- cmd.msf_flag = FALSE;
- if ( SDL_SYS_CDioctl(cdrom->id, DKAUDIO, &cmd) < 0 ) {
- return -1;
- }
- okay = 0;
- cdrom->numtracks = cmd.indexing.track_index.last_track
- - cmd.indexing.track_index.first_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;;
- } else {
- cdrom->track[i].id = cmd.indexing.track_index.first_track+i;
- }
- entry.audio_cmds = CD_GET_TRK_MSF;
- entry.indexing.track_msf.track = cdrom->track[i].id;
- if ( SDL_SYS_CDioctl(cdrom->id, DKAUDIO, &entry) < 0 ) {
- break;
- } else {
- cdrom->track[i].type = 0; /* don't know how to detect 0x04 data track */
- cdrom->track[i].offset = MSF_TO_FRAMES(
- entry.indexing.track_msf.mins,
- entry.indexing.track_msf.secs,
- entry.indexing.track_msf.frames);
- 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 cd_audio_cmd cmd;
- cmd.audio_cmds = CD_INFO_AUDIO;
- if ( SDL_SYS_CDioctl(cdrom->id, DKAUDIO, &cmd) < 0 ) {
- #ifdef DEBUG_CDROM
- fprintf(stderr, "ioctl failed in SDL_SYS_CDStatus (%s)n", SDL_GetError());
- #endif
- status = CD_ERROR;
- } else {
- switch (cmd.status) {
- case CD_NO_AUDIO:
- case CD_COMPLETED:
- status = CD_STOPPED;
- break;
- case CD_PLAY_AUDIO:
- status = CD_PLAYING;
- break;
- case CD_PAUSE_AUDIO:
- status = CD_PAUSED;
- break;
- case CD_NOT_VALID:
- #ifdef DEBUG_CDROM
- fprintf(stderr, "cdStatus failed with CD_NOT_VALIDn");
- #endif
- status = CD_ERROR;
- break;
- case CD_STATUS_ERROR:
- #ifdef DEBUG_CDROM
- fprintf(stderr, "cdStatus failed with CD_STATUS_ERRORn");
- #endif
- status = CD_ERROR;
- break;
- default:
- #ifdef DEBUG_CDROM
- fprintf(stderr, "cdStatus failed with unknown errorn");
- #endif
- status = CD_ERROR;
- break;
- }
- }
- if ( position ) {
- if ( status == CD_PLAYING || (status == CD_PAUSED) ) {
- *position = MSF_TO_FRAMES( cmd.indexing.info_audio.current_mins,
- cmd.indexing.info_audio.current_secs,
- cmd.indexing.info_audio.current_frames);
- } else {
- *position = 0;
- }
- }
- return status;
- }
- /* Start play */
- static int SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length)
- {
- struct cd_audio_cmd cmd;
- /*
- * My CD Rom is muted by default. I think I read that this is new with
- * AIX 4.3. SDL does not change the volume, so I need a kludge. Maybe
- * its better to do this elsewhere?
- */
- cmd.audio_cmds = CD_PLAY_AUDIO | CD_SET_VOLUME;
- cmd.msf_flag = TRUE;
- FRAMES_TO_MSF(start,
- &cmd.indexing.msf.first_mins,
- &cmd.indexing.msf.first_secs,
- &cmd.indexing.msf.first_frames);
- FRAMES_TO_MSF(start+length,
- &cmd.indexing.msf.last_mins,
- &cmd.indexing.msf.last_secs,
- &cmd.indexing.msf.last_frames);
- cmd.volume_type = CD_VOLUME_ALL;
- cmd.all_channel_vol = 255; /* This is a uchar. What is a good value? No docu! */
- cmd.out_port_0_sel = CD_AUDIO_CHNL_0;
- cmd.out_port_1_sel = CD_AUDIO_CHNL_1;
- cmd.out_port_2_sel = CD_AUDIO_CHNL_2;
- cmd.out_port_3_sel = CD_AUDIO_CHNL_3;
- #ifdef DEBUG_CDROM
- fprintf(stderr, "Trying to play from %d:%d:%d to %d:%d:%dn",
- cmd.indexing.msf.first_mins,
- cmd.indexing.msf.first_secs,
- cmd.indexing.msf.first_frames,
- cmd.indexing.msf.last_mins,
- cmd.indexing.msf.last_secs,
- cmd.indexing.msf.last_frames);
- #endif
- return(SDL_SYS_CDioctl(cdrom->id, DKAUDIO, &cmd));
- }
- /* Pause play */
- static int SDL_SYS_CDPause(SDL_CD *cdrom)
- {
- struct cd_audio_cmd cmd;
- cmd.audio_cmds = CD_PAUSE_AUDIO;
- return(SDL_SYS_CDioctl(cdrom->id, DKAUDIO, &cmd));
- }
- /* Resume play */
- static int SDL_SYS_CDResume(SDL_CD *cdrom)
- {
- struct cd_audio_cmd cmd;
- cmd.audio_cmds = CD_RESUME_AUDIO;
- return(SDL_SYS_CDioctl(cdrom->id, DKAUDIO, &cmd));
- }
- /* Stop play */
- static int SDL_SYS_CDStop(SDL_CD *cdrom)
- {
- struct cd_audio_cmd cmd;
- cmd.audio_cmds = CD_STOP_AUDIO;
- return(SDL_SYS_CDioctl(cdrom->id, DKAUDIO, &cmd));
- }
- /* Eject the CD-ROM */
- static int SDL_SYS_CDEject(SDL_CD *cdrom)
- {
- return(SDL_SYS_CDioctl(cdrom->id, DKEJECT, 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;
- }
- }