File indexing completed on 2024-04-21 04:54:23

 /*
  * This file is part of WorkMan, the civilized CD player library
  * Copyright (C) 1991-1997 by Steven Grimm <koreth@midwinter.com>
  * Copyright (C) by Dirk Försterling <milliByte@DeathsDoor.com>
  *
  * 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  *
  *
  * OpenBSD-specific drive control routines. (Based on plat_freebsd.c)
  *
  * Michael Shalayeff, 7/24/96
  * Todd Pfaff, 3/20/94
  *
  */
 
 #if defined(__OpenBSD__) || defined(__OpenBSD)
 
 
 #include <errno.h>
 #include <stdio.h>
 #include <sys/types.h>
 #include <sys/param.h>
 #include <sys/mount.h>
 #include <fcntl.h>
 #include <sys/stat.h>
 
 #include "include/wm_config.h"
 #include "include/wm_cdrom.h"
 #include "include/wm_helpers.h"
 
 /* this is for glibc 2.x which defines the ust structure in ustat.h not stat.h */
 #ifdef __GLIBC__
 #include <sys/ustat.h>
 #endif
 
 #include <sys/time.h>
 #include <string.h>
 #include <sys/ioctl.h>
 #include <sys/cdio.h>
 #include <sys/scsiio.h>
 #include <scsi/scsi_all.h>
 #include <scsi/cd.h>
 #include <scsi/scsi_cd.h>
 
 #include "include/wm_struct.h"
 #include "include/wm_cdtext.h"
 
 #define WM_MSG_CLASS WM_MSG_CLASS_PLATFORM
 
 void *malloc();
 
 int min_volume = 10;
 int max_volume = 255;
 
 const char*
 find_cdrom()
 {
     if (access("/dev/rcd0c", F_OK) == 0) {
         return "/dev/rcd0c";
     } else if (access("/dev/rcd1c", F_OK) == 0) {
         return "/dev/rcd1c";
     } else if (access("/dev/acd0c", F_OK) == 0) {
         return "/dev/acd0c";
     } else {
         fprintf(stderr, "Could not find a CD device!\n");
         return NULL;
     }
 } /* find_cdrom() */
 
 /*
  * Initialize the drive.  A no-op for the generic driver.
  */
 int
 gen_init(struct wm_drive *d)
 {
   return (0);
 } /* gen_init() */
 
 
 /*
  * Open the CD device and figure out what kind of drive is attached.
  */
 int
 gen_open(struct wm_drive *d)
 {
     if (d->fd >= 0) {       /* Device already open? */
        wm_lib_message(WM_MSG_LEVEL_DEBUG|WM_MSG_CLASS, "gen_open(): [device is open (fd=%d)]\n", d->fd);
        return 0;
     }
 
     d->fd = open(d->cd_device, O_RDONLY);
     if (d->fd < 0) {
         if (errno == EIO) /* No CD in drive. */
             return 1;
         else
             return -errno;
     }
 
     return 0;
 } /* gen_open() */
 
 /*
  * Send an arbitrary SCSI command to a device.
  *
  */
 int
 gen_scsi(struct wm_drive *d, unsigned char *cdb,
     int cdblen, void *retbuf, int retbuflen, int getreply)
 {
   return -1;
 } /* gen_scsi() */
 
 int
 gen_close( struct wm_drive *d )
 {
   if(d->fd > -1) {
     wm_lib_message(WM_MSG_LEVEL_DEBUG|WM_MSG_CLASS, "closing the device\n");
     close(d->fd);
   }
   d->fd = -1;
   return 0;
 }
 
 /*
  * Get the current status of the drive: the current play mode, the absolute
  * position from start of disc (in frames), and the current track and index
  * numbers if the CD is playing or paused.
  */
 int
 gen_get_drive_status(struct wm_drive *d, int oldmode,
              int *mode, int *pos, int *track, int *index)
 {
   struct ioc_read_subchannel    sc;
   struct cd_sub_channel_info    scd;
 
   /* If we can't get status, the CD is ejected, so default to that. */
   *mode = WM_CDM_EJECTED;
 
   sc.address_format = CD_MSF_FORMAT;
   sc.data_format    = CD_CURRENT_POSITION;
   sc.track      = 0;
   sc.data_len       = sizeof(scd);
   sc.data       = (struct cd_sub_channel_info *)&scd;
 
   /* Is the device open? */
   if (d->fd < 0) {
     switch (d->proto.open(d)) {
     case -1:    /* error */
       return -1;
     case 1:     /* retry */
       return 0;
     }
   }
 
   if (ioctl(d->fd, CDIOCREADSUBCHANNEL, &sc)) {
     /* we need to release the device so the kernel will notice
     reloaded media */
     d->proto.close(d);
     return 0;   /* ejected */
   }
 
   switch (scd.header.audio_status) {
     case CD_AS_PLAY_IN_PROGRESS:
       *mode = WM_CDM_PLAYING;
       break;
 
     case CD_AS_PLAY_PAUSED:
       if (oldmode == WM_CDM_PLAYING || oldmode == WM_CDM_PAUSED)
         *mode = WM_CDM_PAUSED;
       else
         *mode = WM_CDM_STOPPED;
       break;
 
     case CD_AS_PLAY_COMPLETED:
       *mode = WM_CDM_TRACK_DONE; /* waiting for next track. */
       break;
 
     case CD_AS_NO_STATUS:
     case 0:
       *mode = WM_CDM_STOPPED;
       break;
   }
 
   switch(*mode) {
   case WM_CDM_PLAYING:
   case WM_CDM_PAUSED:
     *pos = scd.what.position.absaddr.msf.minute * 60 * 75 +
       scd.what.position.absaddr.msf.second * 75 +
       scd.what.position.absaddr.msf.frame;
     *track = scd.what.position.track_number;
     *index = scd.what.position.index_number;
     break;
   }
 
   return 0;
 } /* gen_get_drive_status() */
 
 /*
  * Get the number of tracks on the CD.
  */
 int
 gen_get_trackcount(struct wm_drive *d, int *tracks)
 {
   struct ioc_toc_header hdr;
 
   if (ioctl(d->fd, CDIOREADTOCHEADER, &hdr) == -1)
     return (-1);
 
   *tracks = hdr.ending_track - hdr.starting_track + 1;
   return (0);
 } /* gen_get_trackcount() */
 
 /*
  * Get the start time and mode (data or audio) of a track.
  *
  * XXX - this should get cached, but that means keeping track of ejects.
  */
 int
 gen_get_trackinfo(struct wm_drive *d, int track, int *data, int *startframe)
 {
   struct ioc_read_toc_entry toc;
   struct cd_toc_entry       toc_buffer;
 
   bzero((char *)&toc_buffer, sizeof(toc_buffer));
   toc.address_format = CD_MSF_FORMAT;
   toc.starting_track = track;
   toc.data_len = sizeof(toc_buffer);
   toc.data = &toc_buffer;
 
   if (ioctl(d->fd, CDIOREADTOCENTRYS, &toc))
     return (-1);
 
   *data = ((toc_buffer.control & 0x4) != 0);
 
   *startframe = toc_buffer.addr.msf.minute*60*75 +
     toc_buffer.addr.msf.second * 75 +
     toc_buffer.addr.msf.frame;
 
   return (0);
 } /* gen_get_trackinfo() */
 
 /*
  * Get the number of frames on the CD.
  */
 int
 gen_get_cdlen(struct wm_drive *d, int *frames)
 {
   int       tmp;
   struct ioc_toc_header     hdr;
   int status;
 
 #define LEADOUT 0xaa            /* see scsi.c.  what a hack! */
   return gen_get_trackinfo(d, LEADOUT, &tmp, frames);
 } /* gen_get_cdlen() */
 
 /*
  * Play the CD from one position to another (both in frames.)
  */
 int
 gen_play(struct wm_drive *d, int start, int end)
 {
   struct ioc_play_msf   msf;
 
   msf.start_m   = start / (60*75);
   msf.start_s   = (start % (60*75)) / 75;
   msf.start_f   = start % 75;
   msf.end_m = end / (60*75);
   msf.end_s = (end % (60*75)) / 75;
   msf.end_f = end % 75;
 
   if (ioctl(d->fd, CDIOCSTART))
     return (-1);
 
   if (ioctl(d->fd, CDIOCPLAYMSF, &msf))
     return (-2);
 
   return (0);
 } /* gen_play() */
 
 /*
  * Pause the CD.
  */
 int
 gen_pause(struct wm_drive *d)
 {
   return (ioctl(d->fd, CDIOCPAUSE));
 } /* gen_pause() */
 
 /*
  * Resume playing the CD (assuming it was paused.)
  */
 int
 gen_resume(struct wm_drive *d)
 {
   return (ioctl(d->fd, CDIOCRESUME));
 } /* gen_resume() */
 
 /*
  * Stop the CD.
  */
 int
 gen_stop(struct wm_drive *d)
 {
   return (ioctl(d->fd, CDIOCSTOP));
 } /* gen_stop() */
 
 /*
  * Eject the current CD, if there is one.
  */
 int
 gen_eject(struct wm_drive *d)
 {
   /* On some systems, we can check to see if the CD is mounted. */
   struct stat   stbuf;
   struct statfs buf;
   int rval;
 
   if (fstat(d->fd, &stbuf) != 0)
     return (-2);
 
   /* Is this a mounted filesystem? */
   if (fstatfs(stbuf.st_rdev, &buf) == 0)
     return (-3);
 
   rval = ioctl(d->fd, CDIOCALLOW);
   if (rval == 0)
     rval = ioctl(d->fd, CDIOCEJECT);
   if (rval == 0)
     rval = ioctl(d->fd, CDIOCPREVENT);
   if (rval == 0)
     rval = close(d->fd);
   if (rval == 0)
     d->fd = -1;
   return rval;
 } /* gen_eject() */
 
 /*----------------------------------------*
  * Close the CD tray
  *
  * Please edit and send changes to
  * milliByte@DeathsDoor.com
  *----------------------------------------*/
 
 int
 gen_closetray(struct wm_drive *d)
 {
     return -1;
 } /* gen_closetray() */
 
 /*
  * scale_volume(vol, max)
  *
  * Return a volume value suitable for passing to the CD-ROM drive.  "vol"
  * is a volume slider setting; "max" is the slider's maximum value.
  *
  * On Sun and DEC CD-ROM drives, the amount of sound coming out the jack
  * increases much faster toward the top end of the volume scale than it
  * does at the bottom.  To make up for this, we make the volume scale look
  * sort of logarithmic (actually an upside-down inverse square curve) so
  * that the volume value passed to the drive changes less and less as you
  * approach the maximum slider setting.  The actual formula looks like
  *
  *     (max^2 - (max - vol)^2) * (max_volume - min_volume)
  * v = --------------------------------------------------- + min_volume
  *                           max^2
  *
  * If your system's volume settings aren't broken in this way, something
  * like the following should work:
  *
  *  return ((vol * (max_volume - min_volume)) / max + min_volume);
  */
 static int
 scale_volume(int vol, int max)
 {
   return ((vol * (max_volume - min_volume)) / max + min_volume);
 } /* scale_volume() */
 
 /*
  * unscale_volume(cd_vol, max)
  *
  * Given a value between min_volume and max_volume, return the volume slider
  * value needed to achieve that value.
  *
  * Rather than perform floating-point calculations to reverse the above
  * formula, we simply do a binary search of scale_volume()'s return values.
  */
 static int
 unscale_volume(int cd_vol, int max)
 {
     int vol = 0, top = max, bot = 0, scaled;
 
     while (bot <= top)
     {
         vol = (top + bot) / 2;
         scaled = scale_volume(vol, max);
         if (cd_vol == scaled)
             break;
         if (cd_vol < scaled)
             top = vol - 1;
         else
             bot = vol + 1;
     }
 
     if (vol < 0)
         vol = 0;
     else if (vol > max)
         vol = max;
 
     return (vol);
 } /* unscale_volume() */
 
 /*
  * Set the volume level for the left and right channels.  Their values
  * range from 0 to 100.
  */
 int
 gen_set_volume(struct wm_drive *d, int left, int right)
 {
   struct ioc_vol vol;
 
   if (left < 0) /* don't laugh, I saw this happen once! */
     left = 0;
   if (right < 0)
     right = 0;
   left = scale_volume(left, 100);
   right = scale_volume(right, 100);
 
   bzero((char *)&vol, sizeof(vol));
 
   vol.vol[LEFT_PORT] = left;
   vol.vol[RIGHT_PORT] = right;
 
   if (ioctl(d->fd, CDIOCSETVOL, &vol))
     return (-1);
 
   return (0);
 } /* gen_set_volume() */
 
 
 /*
  * Read the initial volume from the drive, if available.  Each channel
  * ranges from 0 to 100, with -1 indicating data not available.
  */
 int
 gen_get_volume(struct wm_drive *d, int *left, int *right)
 {
   struct ioc_vol vol;
 
   if (d->fd >= 0)
     {
       bzero((char *)&vol, sizeof(vol));
 
       if (ioctl(d->fd, CDIOCGETVOL, &vol))
     *left = *right = -1;
       else
     {
       *left = unscale_volume(vol.vol[LEFT_PORT], 100);
       *right = unscale_volume(vol.vol[RIGHT_PORT], 100);
     }
     }
   else
     *left = *right = -1;
 
   return (0);
 } /* gen_get_volume() */
 
 #endif