_cdio_linux.c

linux下的MPEG1

  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_linux (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-p_env->gen.i_first_track].cdte_track = i;
    p_env->tocent[i-p_env->gen.i_first_track].cdte_format = CDROM_MSF;
    if ( ioctl(p_env->gen.fd, CDROMREADTOCENTRY, 
	       &p_env->tocent[i-p_env->gen.i_first_track]) == -1 ) {
      cdio_warn("%s %d: %s\n",
              "error in ioctl CDROMREADTOCENTRY for track", 
              i, strerror(errno));
      return false;
    }
    /****
    struct cdrom_msf0 *msf= &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= &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;
}

/*!
  Run a SCSI MMC command. 
 
  cdio	        CD structure set by cdio_open().
  i_timeout     time in milliseconds we will wait for the command
                to complete. If this value is -1, use the default 
		time-out value.
  p_buf	        Buffer for data, both sending and receiving
  i_buf	        Size of buffer
  e_direction	direction the transfer is to go.
  cdb	        CDB bytes. All values that are needed should be set on 
                input. We'll figure out what the right CDB length should be.

  We return true if command completed successfully and false if not.
 */
static int
run_scsi_cmd_linux( const void *p_user_data, 
		    unsigned int i_timeout_ms,
		    unsigned int i_cdb, const scsi_mmc_cdb_t *p_cdb, 
		    scsi_mmc_direction_t e_direction, 
		    unsigned int i_buf, /*in/out*/ void *p_buf )
{
  const _img_private_t *p_env = p_user_data;
  struct cdrom_generic_command cgc;
  memset (&cgc, 0, sizeof (struct cdrom_generic_command));
  memcpy(&cgc.cmd, p_cdb, i_cdb);
  cgc.buflen = i_buf;
  cgc.buffer = p_buf;
  cgc.data_direction = (SCSI_MMC_DATA_READ == cgc.data_direction)
    ? CGC_DATA_READ : CGC_DATA_WRITE;

#ifdef HAVE_LINUX_CDROM_TIMEOUT
  cgc.timeout = i_timeout_ms;
#endif

  return ioctl (p_env->gen.fd, CDROM_SEND_PACKET, &cgc);
}

/*!
   Return the size of the CD in logical block address (LBA) units.
 */
static uint32_t 
stat_size_linux (void *p_user_data)
{
  _img_private_t *p_env = p_user_data;

  struct cdrom_tocentry tocent;
  uint32_t size;

  tocent.cdte_track = CDIO_CDROM_LEADOUT_TRACK;
  tocent.cdte_format = CDROM_LBA;
  if (ioctl (p_env->gen.fd, CDROMREADTOCENTRY, &tocent) == -1)
    {
      perror ("ioctl(CDROMREADTOCENTRY)");
      exit (EXIT_FAILURE);
    }

  size = tocent.cdte_addr.lba;

  return size;
}

/*!
  Set the arg "key" with "value" in the source device.
  Currently "source" and "access-mode" are valid keys.
  "source" sets the source device in I/O operations 
  "access-mode" sets the the method of CD access 

  0 is returned if no error was found, and nonzero if there as an error.
*/
static int
set_arg_linux (void *p_user_data, const char key[], const char value[])
{
  _img_private_t *p_env = p_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"))
    {
      return str_to_access_mode_linux(value);
    }
  else 
    return -1;

  return 0;
}

/* checklist: /dev/cdrom, /dev/dvd /dev/hd?, /dev/scd? /dev/sr? */
static char checklist1[][40] = {
  {"cdrom"}, {"dvd"}, {""}
};
static char checklist2[][40] = {
  {"?a hd?"}, {"?0 scd?"}, {"?0 sr?"}, {""}
};

#endif /* HAVE_LINUX_CDROM */

/*!
  Return an array of strings giving possible CD devices.
 */
char **
cdio_get_devices_linux (void)
{
#ifndef HAVE_LINUX_CDROM
  return NULL;
#else
  unsigned int i;
  char drive[40];
  char *ret_drive;
  bool exists;
  char **drives = NULL;
  unsigned int num_drives=0;
  
  /* Scan the system for CD-ROM drives.
  */
  for ( i=0; strlen(checklist1[i]) > 0; ++i ) {
    sprintf(drive, "/dev/%s", checklist1[i]);
    if ( (exists=is_cdrom_linux(drive, NULL)) > 0 ) {
      cdio_add_device_list(&drives, drive, &num_drives);
    }
  }

  /* Now check the currently mounted CD drives */
  if (NULL != (ret_drive = check_mounts_linux("/etc/mtab"))) {
    cdio_add_device_list(&drives, ret_drive, &num_drives);
    free(ret_drive);
  }
  
  /* Finally check possible mountable drives in /etc/fstab */
  if (NULL != (ret_drive = check_mounts_linux("/etc/fstab"))) {
    cdio_add_device_list(&drives, ret_drive, &num_drives);
    free(ret_drive);
  }

  /* Scan the system for CD-ROM drives.
     Not always 100% reliable, so use the USE_MNTENT code above first.
  */
  for ( i=0; strlen(checklist2[i]) > 0; ++i ) {
    unsigned int j;
    char *insert;
    exists = true;
    for ( j=checklist2[i][1]; exists; ++j ) {
      sprintf(drive, "/dev/%s", &checklist2[i][3]);
      insert = strchr(drive, '?');
      if ( insert != NULL ) {
	*insert = j;
      }
      if ( (exists=is_cdrom_linux(drive, NULL)) > 0 ) {
	cdio_add_device_list(&drives, drive, &num_drives);
      }
    }
  }
  cdio_add_device_list(&drives, NULL, &num_drives);
  return drives;
#endif /*HAVE_LINUX_CDROM*/
}

/*!
  Return a string containing the default CD device.
 */
char *
cdio_get_default_device_linux(void)
{
#ifndef HAVE_LINUX_CDROM
  return NULL;
  
#else
  unsigned int i;
  char drive[40];
  bool exists;
  char *ret_drive;

  /* Scan the system for CD-ROM drives.
  */
  for ( i=0; strlen(checklist1[i]) > 0; ++i ) {
    sprintf(drive, "/dev/%s", checklist1[i]);
    if ( (exists=is_cdrom_linux(drive, NULL)) > 0 ) {
      return strdup(drive);
    }
  }

  /* Now check the currently mounted CD drives */
  if (NULL != (ret_drive = check_mounts_linux("/etc/mtab")))
    return ret_drive;
  
  /* Finally check possible mountable drives in /etc/fstab */
  if (NULL != (ret_drive = check_mounts_linux("/etc/fstab")))
    return ret_drive;

  /* Scan the system for CD-ROM drives.
     Not always 100% reliable, so use the USE_MNTENT code above first.
  */
  for ( i=0; strlen(checklist2[i]) > 0; ++i ) {
    unsigned int j;
    char *insert;
    exists = true;
    for ( j=checklist2[i][1]; exists; ++j ) {
      sprintf(drive, "/dev/%s", &checklist2[i][3]);
      insert = strchr(drive, '?');
      if ( insert != NULL ) {
	*insert = j;
      }
      if ( (exists=is_cdrom_linux(drive, NULL)) > 0 ) {
	return(strdup(drive));
      }
    }
  }
  return NULL;
#endif /*HAVE_LINUX_CDROM*/
}
/*!
  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_linux (const char *psz_source_name)
{
  return cdio_open_am_linux(psz_source_name, NULL);
}

/*!
  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_linux (const char *psz_orig_source, const char *access_mode)
{

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

  cdio_funcs _funcs = {
    .eject_media        = eject_media_linux,
    .free               = cdio_generic_free,
    .get_arg            = get_arg_linux,
    .get_cdtext         = get_cdtext_generic,
    .get_default_device = cdio_get_default_device_linux,
    .get_devices        = cdio_get_devices_linux,
    .get_discmode       = get_discmode_linux,
#if USE_LINUX_CAP
    .get_drive_cap      = get_drive_cap_linux,
#else
    .get_drive_cap      = scsi_mmc_get_drive_cap_generic,
#endif
    .get_first_track_num= get_first_track_num_generic,
    .get_hwinfo         = NULL,
    .get_mcn            = get_mcn_linux,
    .get_num_tracks     = get_num_tracks_generic,
    .get_track_format   = get_track_format_linux,
    .get_track_green    = get_track_green_linux,
    .get_track_lba      = NULL, /* This could be implemented if need be. */
    .get_track_msf      = get_track_msf_linux,
    .lseek              = cdio_generic_lseek,
    .read               = cdio_generic_read,
    .read_audio_sectors = _read_audio_sectors_linux,
    .read_mode1_sector  = _read_mode1_sector_linux,
    .read_mode1_sectors = _read_mode1_sectors_linux,
    .read_mode2_sector  = _read_mode2_sector_linux,
    .read_mode2_sectors = _read_mode2_sectors_linux,
    .read_toc           = read_toc_linux,
    .run_scsi_mmc_cmd   = run_scsi_cmd_linux,
    .set_arg            = set_arg_linux,
    .stat_size          = stat_size_linux
  };

  _data                 = _cdio_malloc (sizeof (_img_private_t));

  _data->access_mode    = str_to_access_mode_linux(access_mode);
  _data->gen.init       = false;
  _data->gen.toc_init   = false;
  _data->gen.fd         = -1;
  _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) {
      free(_data);
      return NULL;
    }
    set_arg_linux(_data, "source", psz_source);
    free(psz_source);
  } else {
    if (cdio_is_device_generic(psz_orig_source))
      set_arg_linux(_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
      free(_data);
      return NULL;
    }
  }

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

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

}

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