sdl_syscdrom.c

jpeg and mpeg 编解码技术源代码

				}
			} 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 %s\n", 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 %s\n",
		        cdromname, "CD-ROM Data Mode 1");
		    break;
		case CD_MODE2_FORM1 :
                    fprintf(stderr,
	                "Drive mode for %s is %s\n",
		        cdromname, "CD-ROM XA Data Mode 2 Form 1");
		    break;
		case CD_MODE2_FORM2 :
                    fprintf(stderr,
	                "Drive mode for %s is %s\n",
		        cdromname, "CD-ROM XA Data Mode 2 Form 2");
		    break;
		case CD_DA :
                    fprintf(stderr,
	                "Drive mode for %s is %s\n",
		        cdromname, "CD-DA");
		    break;
		default :
                    fprintf(stderr,
	                "Drive mode for %s is %s\n",
		        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_DA\n",
		    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_VALID\n");
#endif
                status = CD_ERROR;
                break;
            case CD_STATUS_ERROR:
#ifdef DEBUG_CDROM
    fprintf(stderr, "cdStatus failed with CD_STATUS_ERROR\n");
#endif
                status = CD_ERROR;
                break;
            default:
#ifdef DEBUG_CDROM
    fprintf(stderr, "cdStatus failed with unknown error\n");
#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:%d\n",
	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;
	}
}