scsi_mmc.c

linux下的MPEG1

  if (0 == i_status) {
    uint8_t *p;
    uint8_t *p_max = buf + 256;
    
    *p_read_cap  = 0;
    *p_write_cap = 0;
    *p_misc_cap  = 0;

    /* set to first sense mask, and then walk through the masks */
    p = buf + 8;
    while( (p < &(buf[2+i_data])) && (p < p_max) )       {
      uint8_t which_page;
      
      which_page = p[0] & 0x3F;
      switch( which_page )
	{
	case CDIO_MMC_AUDIO_CTL_PAGE:
	case CDIO_MMC_R_W_ERROR_PAGE:
	case CDIO_MMC_CDR_PARMS_PAGE:
	  /* Don't handle these yet. */
	  break;
	case CDIO_MMC_CAPABILITIES_PAGE:
	  scsi_mmc_get_drive_cap_buf(p, p_read_cap, p_write_cap, p_misc_cap);
	  break;
	default: ;
	}
      p += (p[1] + 2);
    }
  } else {
    cdio_info("%s: %s\n", "error in MODE_SELECT", strerror(errno));
    *p_read_cap  = CDIO_DRIVE_CAP_ERROR;
    *p_write_cap = CDIO_DRIVE_CAP_ERROR;
    *p_misc_cap  = CDIO_DRIVE_CAP_ERROR;
  }
  return;
}

void
scsi_mmc_get_drive_cap (const CdIo *p_cdio,
			/*out*/ cdio_drive_read_cap_t  *p_read_cap,
			/*out*/ cdio_drive_write_cap_t *p_write_cap,
			/*out*/ cdio_drive_misc_cap_t  *p_misc_cap)
{
  if ( ! p_cdio )  return;
  scsi_mmc_get_drive_cap_private (p_cdio->env, 
				  p_cdio->op.run_scsi_mmc_cmd, 
				  p_read_cap, p_write_cap, p_misc_cap);
}

void
scsi_mmc_get_drive_cap_generic (const void *p_user_data,
				/*out*/ cdio_drive_read_cap_t  *p_read_cap,
				/*out*/ cdio_drive_write_cap_t *p_write_cap,
				/*out*/ cdio_drive_misc_cap_t  *p_misc_cap)
{
  const generic_img_private_t *p_env = p_user_data;
  scsi_mmc_get_drive_cap( p_env->cdio,
			  p_read_cap, p_write_cap, p_misc_cap );
}


/*! 
  Get the DVD type associated with cd object.
*/
discmode_t
scsi_mmc_get_dvd_struct_physical_private ( void *p_env, const 
					   scsi_mmc_run_cmd_fn_t run_scsi_mmc_cmd, 
					   cdio_dvd_struct_t *s)
{
  scsi_mmc_cdb_t cdb = {{0, }};
  unsigned char buf[4 + 4 * 20], *base;
  int i_status;
  uint8_t layer_num = s->physical.layer_num;
  
  cdio_dvd_layer_t *layer;
  
  if ( ! p_env || ! run_scsi_mmc_cmd )
    return -2;

  if (layer_num >= CDIO_DVD_MAX_LAYERS)
    return -EINVAL;
  
  CDIO_MMC_SET_COMMAND(cdb.field, CDIO_MMC_GPCMD_READ_DVD_STRUCTURE);
  cdb.field[6] = layer_num;
  cdb.field[7] = CDIO_DVD_STRUCT_PHYSICAL;
  cdb.field[9] = sizeof(buf) & 0xff;
  
  i_status = run_scsi_mmc_cmd(p_env, DEFAULT_TIMEOUT_MS, 
			      scsi_mmc_get_cmd_len(cdb.field[0]), 
			      &cdb, SCSI_MMC_DATA_READ, 
			      sizeof(buf), &buf);
  if (0 != i_status)
    return CDIO_DISC_MODE_ERROR;
  
  base = &buf[4];
  layer = &s->physical.layer[layer_num];
  
  /*
   * place the data... really ugly, but at least we won't have to
   * worry about endianess in userspace.
   */
  memset(layer, 0, sizeof(*layer));
  layer->book_version = base[0] & 0xf;
  layer->book_type = base[0] >> 4;
  layer->min_rate = base[1] & 0xf;
  layer->disc_size = base[1] >> 4;
  layer->layer_type = base[2] & 0xf;
  layer->track_path = (base[2] >> 4) & 1;
  layer->nlayers = (base[2] >> 5) & 3;
  layer->track_density = base[3] & 0xf;
  layer->linear_density = base[3] >> 4;
  layer->start_sector = base[5] << 16 | base[6] << 8 | base[7];
  layer->end_sector = base[9] << 16 | base[10] << 8 | base[11];
  layer->end_sector_l0 = base[13] << 16 | base[14] << 8 | base[15];
  layer->bca = base[16] >> 7;

  return 0;
}


/*! 
  Get the DVD type associated with cd object.
*/
discmode_t
scsi_mmc_get_dvd_struct_physical ( const CdIo *p_cdio, cdio_dvd_struct_t *s)
{
  if ( ! p_cdio )  return -2;
  return 
    scsi_mmc_get_dvd_struct_physical_private (p_cdio->env, 
					      p_cdio->op.run_scsi_mmc_cmd, 
					      s);
}

/*! 
  Get the CD-ROM hardware info via a SCSI MMC INQUIRY command.
  False is returned if we had an error getting the information.
*/
bool 
scsi_mmc_get_hwinfo ( const CdIo *p_cdio, 
		      /*out*/ cdio_hwinfo_t *hw_info )
{
  int i_status;                  /* Result of SCSI MMC command */
  char buf[36] = { 0, };         /* Place to hold returned data */
  scsi_mmc_cdb_t cdb = {{0, }};  /* Command Descriptor Block */
  
  CDIO_MMC_SET_COMMAND(cdb.field, CDIO_MMC_GPCMD_INQUIRY);
  cdb.field[4] = sizeof(buf);

  if (! p_cdio || ! hw_info ) return false;
  
  i_status = scsi_mmc_run_cmd(p_cdio, DEFAULT_TIMEOUT_MS, 
			      &cdb, SCSI_MMC_DATA_READ, 
			      sizeof(buf), &buf);
  if (i_status == 0) {
      
      memcpy(hw_info->psz_vendor, 
	     buf + 8, 
	     sizeof(hw_info->psz_vendor)-1);
      hw_info->psz_vendor[sizeof(hw_info->psz_vendor)-1] = '\0';
      memcpy(hw_info->psz_model,  
	     buf + 8 + CDIO_MMC_HW_VENDOR_LEN, 
	     sizeof(hw_info->psz_model)-1);
      hw_info->psz_model[sizeof(hw_info->psz_model)-1] = '\0';
      memcpy(hw_info->psz_revision, 
	     buf + 8 + CDIO_MMC_HW_VENDOR_LEN + CDIO_MMC_HW_MODEL_LEN,
	     sizeof(hw_info->psz_revision)-1);
      hw_info->psz_revision[sizeof(hw_info->psz_revision)-1] = '\0';
      return true;
    }
  return false;
}

/*!
  Return the media catalog number MCN.

  Note: string is malloc'd so caller should free() then returned
  string when done with it.

 */
char *
scsi_mmc_get_mcn_private ( void *p_env,
			   const scsi_mmc_run_cmd_fn_t run_scsi_mmc_cmd
			   )
{
  scsi_mmc_cdb_t cdb = {{0, }};
  char buf[28] = { 0, };
  int i_status;

  if ( ! p_env || ! run_scsi_mmc_cmd )
    return NULL;

  CDIO_MMC_SET_COMMAND(cdb.field, CDIO_MMC_GPCMD_READ_SUBCHANNEL);
  cdb.field[1] = 0x0;  
  cdb.field[2] = 0x40; 
  cdb.field[3] = CDIO_SUBCHANNEL_MEDIA_CATALOG;
  CDIO_MMC_SET_READ_LENGTH16(cdb.field, sizeof(buf));

  i_status = run_scsi_mmc_cmd(p_env, DEFAULT_TIMEOUT_MS, 
			      scsi_mmc_get_cmd_len(cdb.field[0]), 
			      &cdb, SCSI_MMC_DATA_READ, 
			      sizeof(buf), buf);
  if(i_status == 0) {
    return strdup(&buf[9]);
  }
  return NULL;
}

char *
scsi_mmc_get_mcn ( const CdIo *p_cdio )
{
  if ( ! p_cdio )  return NULL;
  return scsi_mmc_get_mcn_private (p_cdio->env, 
				   p_cdio->op.run_scsi_mmc_cmd );
}

char *
scsi_mmc_get_mcn_generic (const void *p_user_data)
{
  const generic_img_private_t *p_env = p_user_data;
  return scsi_mmc_get_mcn( p_env->cdio );
}

/*
  Read cdtext information for a CdIo object .
  
  return true on success, false on error or CD-Text information does
  not exist.
*/
bool
scsi_mmc_init_cdtext_private ( void *p_user_data, 
			       const scsi_mmc_run_cmd_fn_t run_scsi_mmc_cmd,
			       set_cdtext_field_fn_t set_cdtext_field_fn 
			       )
{

  generic_img_private_t *p_env = p_user_data;
  scsi_mmc_cdb_t  cdb = {{0, }};
  unsigned char   wdata[5000] = { 0, };
  int             i_status, i_errno;

  if ( ! p_env || ! run_scsi_mmc_cmd || p_env->b_cdtext_error )
    return false;

  /* Operation code */
  CDIO_MMC_SET_COMMAND(cdb.field, CDIO_MMC_GPCMD_READ_TOC);

  cdb.field[1] = CDIO_CDROM_MSF;
  /* Format */
  cdb.field[2] = CDIO_MMC_READTOC_FMT_CDTEXT;

  /* Setup to read header, to get length of data */
  CDIO_MMC_SET_READ_LENGTH16(cdb.field, 4);

  errno = 0;

/* Set read timeout 3 minues. */
#define READ_TIMEOUT 3*60*1000

  /* We may need to give CD-Text a little more time to complete. */
  /* First off, just try and read the size */
  i_status = run_scsi_mmc_cmd (p_env, READ_TIMEOUT,
			       scsi_mmc_get_cmd_len(cdb.field[0]), 
			       &cdb, SCSI_MMC_DATA_READ, 
			       4, &wdata);

  if (i_status != 0) {
    cdio_info ("CD-Text read failed for header: %s\n", strerror(errno));  
	i_errno = errno;
    p_env->b_cdtext_error = true;
    return false;
  } else {
    /* Now read the CD-Text data */
    int	i_cdtext = CDIO_MMC_GET_LEN16(wdata);

    if (i_cdtext > sizeof(wdata)) i_cdtext = sizeof(wdata);
    
    CDIO_MMC_SET_READ_LENGTH16(cdb.field, i_cdtext);
    i_status = run_scsi_mmc_cmd (p_env, READ_TIMEOUT,
				 scsi_mmc_get_cmd_len(cdb.field[0]), 
				 &cdb, SCSI_MMC_DATA_READ, 
				 i_cdtext, &wdata);
    if (i_status != 0) {
      cdio_info ("CD-Text read for text failed: %s\n", strerror(errno));  
      i_errno = errno;
      p_env->b_cdtext_error = true;
      return false;
    }
    p_env->b_cdtext_init = true;
    return cdtext_data_init(p_env, p_env->i_first_track, wdata, 
			    set_cdtext_field_fn);
  }
}