_cdio_bsdi.c

linux下的MPEG1

/*!
  Set the key "arg" to "value" in source device.
*/
static int
_set_arg_bsdi (void *user_data, const char key[], const char value[])
{
  _img_private_t *p_env = user_data;

  if (!strcmp (key, "source"))
    {
      if (!value)
	return -2;

      free (p_env->gen.source_name);
      
      p_env->gen.source_name = strdup (value);
    }
  else if (!strcmp (key, "access-mode"))
    {
      if (!strcmp(value, "IOCTL"))
	p_env->access_mode = _AM_IOCTL;
      else
	cdio_warn ("unknown access type: %s. ignored.", value);
    }
  else 
    return -1;

  return 0;
}

/*! 
  Read and cache the CD's Track Table of Contents and track info.
  Return false if successful or true if an error.
*/
static bool
read_toc_bsdi (void *p_user_data) 
{
  _img_private_t *p_env = p_user_data;
  int i;

  /* read TOC header */
  if ( ioctl(p_env->gen.fd, CDROMREADTOCHDR, &p_env->tochdr) == -1 ) {
    cdio_warn("%s: %s\n", 
            "error in ioctl CDROMREADTOCHDR", strerror(errno));
    return false;
  }

  p_env->gen.i_first_track = p_env->tochdr.cdth_trk0;
  p_env->gen.i_tracks      = p_env->tochdr.cdth_trk1;
  
  /* read individual tracks */
  for (i= p_env->gen.i_first_track; i<=p_env->gen.i_tracks; i++) {
    p_env->tocent[i-1].cdte_track = i;
    p_env->tocent[i-1].cdte_format = CDROM_MSF;
    if (ioctl(p_env->gen.fd, CDROMREADTOCENTRY, &p_env->tocent[i-1]) == -1) {
      cdio_warn("%s %d: %s\n",
              "error in ioctl CDROMREADTOCENTRY for track", 
              i, strerror(errno));
      return false;
    }
    /****
    struct cdrom_msf0 *msf= &p_env->tocent[i-1].cdte_addr.msf;
    
    fprintf (stdout, "--- track# %d (msf %2.2x:%2.2x:%2.2x)\n",
	     i, msf->minute, msf->second, msf->frame);
    ****/

  }

  /* read the lead-out track */
  p_env->tocent[p_env->gen.i_tracks].cdte_track = CDIO_CDROM_LEADOUT_TRACK;
  p_env->tocent[p_env->gen.i_tracks].cdte_format = CDROM_MSF;

  if (ioctl(p_env->gen.fd, CDROMREADTOCENTRY, 
	    &p_env->tocent[p_env->gen.i_tracks]) == -1 ) {
    cdio_warn("%s: %s\n", 
	     "error in ioctl CDROMREADTOCENTRY for lead-out",
            strerror(errno));
    return false;
  }

  /*
  struct cdrom_msf0 *msf= &p_env->tocent[p_env->gen.i_tracks].cdte_addr.msf;

  fprintf (stdout, "--- track# %d (msf %2.2x:%2.2x:%2.2x)\n",
	   i, msf->minute, msf->second, msf->frame);
  */

  p_env->gen.toc_init = true;
  return true;
}

/*!
  Eject media in CD drive. If successful, as a side effect we 
  also free obj.
 */
static int 
_eject_media_bsdi (void *user_data) {

  _img_private_t *p_env = user_data;
  int ret=2;
  int status;
  int fd;

  close(p_env->gen.fd);
  p_env->gen.fd = -1;
  if ((fd = open (p_env->gen.source_name, O_RDONLY|O_NONBLOCK)) > -1) {
    if((status = ioctl(fd, CDROM_DRIVE_STATUS, (void *) CDSL_CURRENT)) > 0) {
      switch(status) {
      case CDS_TRAY_OPEN:
	if((ret = ioctl(fd, CDROMCLOSETRAY, 0)) != 0) {
	  cdio_warn ("ioctl CDROMCLOSETRAY failed: %s\n", strerror(errno));  
	}
	break;
      case CDS_DISC_OK:
	if((ret = ioctl(fd, CDROMEJECT, 0)) != 0) {
	  cdio_warn("ioctl CDROMEJECT failed: %s\n", strerror(errno));  
	}
	break;
      }
      ret=0;
    } else {
      cdio_warn ("CDROM_DRIVE_STATUS failed: %s\n", strerror(errno));
      ret=1;
    }
    close(fd);
  }
  return 2;
}

/*!
  Return the value associated with the key "arg".
*/
static const char *
_get_arg_bsdi (void *user_data, const char key[])
{
  _img_private_t *p_env = user_data;

  if (!strcmp (key, "source")) {
    return p_env->gen.source_name;
  } else if (!strcmp (key, "access-mode")) {
    switch (p_env->access_mode) {
    case _AM_IOCTL:
      return "ioctl";
    case _AM_NONE:
      return "no access method";
    }
  } 
  return NULL;
}

/*!
  Return the media catalog number MCN.
  Note: string is malloc'd so caller should free() then returned
  string when done with it.
 */
static char *
_get_mcn_bsdi (const void *user_data) {

  struct cdrom_mcn mcn;
  const _img_private_t *p_env = user_data;
  if (ioctl(p_env->gen.fd, CDROM_GET_MCN, &mcn) != 0)
    return NULL;
  return strdup(mcn.medium_catalog_number);
}

/*!  
  Get format of track. 
*/
static track_format_t
get_track_format_bsdi(void *user_data, track_t i_track) 
{
  _img_private_t *p_env = user_data;
  
  if (!p_env->gen.toc_init) read_toc_bsdi (p_env) ;

  if (i_track > p_env->gen.i_tracks || i_track == 0)
    return TRACK_FORMAT_ERROR;

  i_track -= p_env->gen.i_first_track;

  /* This is pretty much copied from the "badly broken" cdrom_count_tracks
     in linux/cdrom.c.
   */
  if (p_env->tocent[i_track].cdte_ctrl & CDROM_DATA_TRACK) {
    if (p_env->tocent[i_track].cdte_format == CDIO_CDROM_CDI_TRACK)
      return TRACK_FORMAT_CDI;
    else if (p_env->tocent[i_track].cdte_format == CDIO_CDROM_XA_TRACK) 
      return TRACK_FORMAT_XA;
    else
      return TRACK_FORMAT_DATA;
  } else
    return TRACK_FORMAT_AUDIO;
  
}

/*!
  Return true if we have XA data (green, mode2 form1) or
  XA data (green, mode2 form2). That is track begins:
  sync - header - subheader
  12     4      -  8

  FIXME: there's gotta be a better design for this and get_track_format?
*/
static bool
_get_track_green_bsdi(void *user_data, track_t i_track) 
{
  _img_private_t *p_env = user_data;
  
  if (!p_env->gen.toc_init) read_toc_bsdi (p_env) ;

  if (i_track == CDIO_CDROM_LEADOUT_TRACK) i_track = p_env->gen.i_tracks+1;

  if (i_track > p_env->gen.i_tracks+1 || i_track == 0)
    return false;

  /* FIXME: Dunno if this is the right way, but it's what 
     I was using in cdinfo for a while.
   */
  return ((p_env->tocent[i_track-1].cdte_ctrl & 2) != 0);
}

/*!  
  Return the starting MSF (minutes/secs/frames) for track number
  i_track in obj.  Track numbers start at 1.
  The "leadout" track is specified either by
  using i_track LEADOUT_TRACK or the total tracks+1.
  False is returned if there is no track entry.
*/
static bool
_get_track_msf_bsdi(void *user_data, track_t i_track, msf_t *msf)
{
  _img_private_t *p_env = user_data;

  if (NULL == msf) return false;

  if (!p_env->gen.toc_init) read_toc_bsdi (p_env) ;

  if (i_track == CDIO_CDROM_LEADOUT_TRACK) i_track = p_env->gen.i_tracks+1;

  if (i_track > p_env->gen.i_tracks+1 || i_track == 0) {
    return false;
  } 

  i_track -= p_env->gen.i_first_track;

  {
    struct cdrom_msf0  *msf0= &p_env->tocent[i_track].cdte_addr.msf;
    msf->m = cdio_to_bcd8(msf0->minute);
    msf->s = cdio_to_bcd8(msf0->second);
    msf->f = cdio_to_bcd8(msf0->frame);
    return true;
  }
}

#endif /* HAVE_BSDI_CDROM */

/*!
  Return an array of strings giving possible CD devices.
 */
char **
cdio_get_devices_bsdi (void)
{
#ifndef HAVE_BSDI_CDROM
  return NULL;
#else
  char drive[40];
  char **drives = NULL;
  unsigned int num_drives=0;
  bool exists=true;
  char c;
  
  /* Scan the system for CD-ROM drives.
  */

#ifdef USE_ETC_FSTAB

  struct fstab *fs;
  setfsent();
  
  /* Check what's in /etc/fstab... */
  while ( (fs = getfsent()) )
    {
      if (strncmp(fs->fs_spec, "/dev/sr", 7))
	cdio_add_device_list(&drives, fs->fs_spec, &num_drives);
    }
  
#endif

  /* Scan the system for CD-ROM drives.
     Not always 100% reliable, so use the USE_MNTENT code above first.
  */
  for ( c='0'; exists && c <='9'; c++ ) {
    sprintf(drive, "/dev/rsr%cc", c);
    exists = cdio_is_cdrom(drive, NULL);
    if ( exists ) {
      cdio_add_device_list(&drives, drive, &num_drives);
    }
  }
  cdio_add_device_list(&drives, NULL, &num_drives);
  return drives;
#endif /*HAVE_BSDI_CDROM*/
}

/*!
  Return a string containing the default CD device if none is specified.
 */
char *
cdio_get_default_device_bsdi(void)
{
  return strdup(DEFAULT_CDIO_DEVICE);
}

/*!
  Initialization routine. This is the only thing that doesn't
  get called via a function pointer. In fact *we* are the
  ones to set that up.
 */
CdIo *
cdio_open_am_bsdi (const char *psz_source_name, const char *psz_access_mode)
{
  if (psz_access_mode != NULL)
    cdio_warn ("there is only one access mode for bsdi. Arg %s ignored",
	       psz_access_mode);
  return cdio_open_bsdi(psz_source_name);
}


/*!
  Initialization routine. This is the only thing that doesn't
  get called via a function pointer. In fact *we* are the
  ones to set that up.
 */
CdIo *
cdio_open_bsdi (const char *psz_orig_source)
{

#ifdef HAVE_BSDI_CDROM
  CdIo *ret;
  _img_private_t *_data;
  char *psz_source;

  cdio_funcs _funcs = {
    .eject_media        = _eject_media_bsdi,
    .free               = cdio_generic_free,
    .get_arg            = _get_arg_bsdi,
    .get_cdtext         = get_cdtext_generic,
    .get_default_device = cdio_get_default_device_bsdi,
    .get_devices        = cdio_get_devices_bsdi,
    .get_drive_cap      = scsi_mmc_get_drive_cap_generic,
    .get_discmode       = get_discmode_generic,
    .get_first_track_num= get_first_track_num_generic,
    .get_hwinfo         = NULL,
    .get_mcn            = _get_mcn_bsdi, 
    .get_num_tracks     = get_num_tracks_generic,
    .get_track_format   = get_track_format_bsdi,
    .get_track_green    = _get_track_green_bsdi,
    .get_track_lba      = NULL, /* This could be implemented if need be. */
    .get_track_msf      = _get_track_msf_bsdi,
    .lseek              = cdio_generic_lseek,
    .read               = cdio_generic_read,
    .read_audio_sectors = _read_audio_sectors_bsdi,
    .read_mode1_sector  = _read_mode1_sector_bsdi,
    .read_mode1_sectors = _read_mode1_sectors_bsdi,
    .read_mode2_sector  = _read_mode2_sector_bsdi,
    .read_mode2_sectors = _read_mode2_sectors_bsdi,
    .read_toc           = &read_toc_bsdi,
    .run_scsi_mmc_cmd   = &run_scsi_cmd_bsdi,
    .set_arg            = _set_arg_bsdi,
    .stat_size          = _stat_size_bsdi
  };

  _data                 = _cdio_malloc (sizeof (_img_private_t));
  _data->access_mode    = _AM_IOCTL;
  _data->gen.init       = false;
  _data->gen.fd         = -1;
  _data->gen.toc_init   = false;
  _data->gen.b_cdtext_init  = false;
  _data->gen.b_cdtext_error = false;

  if (NULL == psz_orig_source) {
    psz_source=cdio_get_default_device_linux();
    if (NULL == psz_source) return NULL;
    _set_arg_bsdi(_data, "source", psz_source);
    free(psz_source);
  } else {
    if (cdio_is_device_generic(psz_orig_source))
      _set_arg_bsdi(_data, "source", psz_orig_source);
    else {
      /* The below would be okay if all device drivers worked this way. */
#if 0
      cdio_info ("source %s is not a device", psz_orig_source);
#endif
      return NULL;
    }
  }

  ret = cdio_new ( (void *) _data, &_funcs);
  if (ret == NULL) return NULL;

  if (_cdio_init(_data))
    return ret;
  else {
    cdio_generic_free (_data);
    return NULL;
  }
  
#else 
  return NULL;
#endif /* HAVE_BSDI_CDROM */

}

bool
cdio_have_bsdi (void)
{
#ifdef HAVE_BSDI_CDROM
  return true;
#else 
  return false;
#endif /* HAVE_BSDI_CDROM */
}