cdio.c

linux下的MPEG1

}


/*!
  Return the number of the first track. 
  CDIO_INVALID_TRACK is returned on error.
*/
track_t
cdio_get_first_track_num (const CdIo *p_cdio)
{
  if (NULL == p_cdio) return CDIO_INVALID_TRACK;

  if (p_cdio->op.get_first_track_num) {
    return p_cdio->op.get_first_track_num (p_cdio->env);
  } else {
    return CDIO_INVALID_TRACK;
  }
}

/*!
  Return a string containing the name of the driver in use.
  if CdIo is NULL (we haven't initialized a specific device driver), 
  then return NULL.
*/
bool
cdio_get_hwinfo (const CdIo *p_cdio, cdio_hwinfo_t *hw_info) 
{
  if (!p_cdio) return false;
  if (p_cdio->op.get_hwinfo) {
    return p_cdio->op.get_hwinfo (p_cdio, hw_info);
  } else {
    /* Perhaps driver forgot to initialize.  We are no worse off Using
       scsi_mmc than returning false here. */
    return scsi_mmc_get_hwinfo(p_cdio, hw_info);
  }
}

/*!
  Return a string containing the name of the driver in use.
  if CdIo is NULL (we haven't initialized a specific device driver), 
  then return NULL.
*/
char *
cdio_get_mcn (const CdIo *p_cdio) 
{
  if (p_cdio->op.get_mcn) {
    return p_cdio->op.get_mcn (p_cdio->env);
  } else {
    return NULL;
  }
}

/*! 
  Return the number of tracks in the current medium.
  CDIO_INVALID_TRACK is returned on error.
*/
track_t
cdio_get_num_tracks (const CdIo *p_cdio)
{
  if (p_cdio == NULL) return CDIO_INVALID_TRACK;

  if (p_cdio->op.get_num_tracks) {
    return p_cdio->op.get_num_tracks (p_cdio->env);
  } else {
    return CDIO_INVALID_TRACK;
  }
}

/*!  
  Get format of track. 
*/
track_format_t
cdio_get_track_format(const CdIo *p_cdio, track_t i_track)
{
  cdio_assert (p_cdio != NULL);

  if (p_cdio->op.get_track_format) {
    return p_cdio->op.get_track_format (p_cdio->env, i_track);
  } else {
    return TRACK_FORMAT_ERROR;
  }
}

/*!
  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?
*/
bool
cdio_get_track_green(const CdIo *cdio, track_t track_num)
{
  cdio_assert (cdio != NULL);

  if (cdio->op.get_track_green) {
    return cdio->op.get_track_green (cdio->env, track_num);
  } else {
    return false;
  }
}

/*!  
  Return the starting LBA for track number
  track_num in cdio.  Tracks numbers start at 1.
  The "leadout" track is specified either by
  using track_num LEADOUT_TRACK or the total tracks+1.
  CDIO_INVALID_LBA is returned on error.
*/
lba_t
cdio_get_track_lba(const CdIo *cdio, track_t track_num)
{
  if (cdio == NULL) return CDIO_INVALID_LBA;

  if (cdio->op.get_track_lba) {
    return cdio->op.get_track_lba (cdio->env, track_num);
  } else {
    msf_t msf;
    if (cdio->op.get_track_msf) 
      if (cdio_get_track_msf(cdio, track_num, &msf))
        return cdio_msf_to_lba(&msf);
    return CDIO_INVALID_LBA;
  }
}

/*!  
  Return the starting LSN for track number
  track_num in cdio.  Tracks numbers start at 1.
  The "leadout" track is specified either by
  using track_num LEADOUT_TRACK or the total tracks+1.
  CDIO_INVALID_LBA is returned on error.
*/
lsn_t
cdio_get_track_lsn(const CdIo *cdio, track_t track_num)
{
  if (cdio == NULL) return CDIO_INVALID_LBA;

  if (cdio->op.get_track_lba) {
    return cdio_lba_to_lsn(cdio->op.get_track_lba (cdio->env, track_num));
  } else {
    msf_t msf;
    if (cdio_get_track_msf(cdio, track_num, &msf))
      return cdio_msf_to_lsn(&msf);
    return CDIO_INVALID_LSN;
  }
}

/*!  
  Return the starting MSF (minutes/secs/frames) for track number
  track_num in cdio.  Track numbers start at 1.
  The "leadout" track is specified either by
  using track_num LEADOUT_TRACK or the total tracks+1.
  False is returned if there is no track entry.
*/
bool
cdio_get_track_msf(const CdIo *cdio, track_t track_num, /*out*/ msf_t *msf)
{
  cdio_assert (cdio != NULL);

  if (cdio->op.get_track_msf) {
    return cdio->op.get_track_msf (cdio->env, track_num, msf);
  } else if (cdio->op.get_track_lba) {
    lba_t lba = cdio->op.get_track_lba (cdio->env, track_num);
    if (lba  == CDIO_INVALID_LBA) return false;
    cdio_lba_to_msf(lba, msf);
    return true;
  } else {
    return false;
  }
}

/*!  
  Return the number of sectors between this track an the next.  This
  includes any pregap sectors before the start of the next track.
  Tracks start at 1.
  0 is returned if there is an error.
*/
unsigned int
cdio_get_track_sec_count(const CdIo *cdio, track_t track_num)
{
  track_t num_tracks = cdio_get_num_tracks(cdio);

  if (track_num >=1 && track_num <= num_tracks) 
    return ( cdio_get_track_lba(cdio, track_num+1) 
             - cdio_get_track_lba(cdio, track_num) );
  return 0;
}

bool
cdio_have_driver(driver_id_t driver_id)
{
  return (*CdIo_all_drivers[driver_id].have_driver)();
}

/*!  
  Return the Joliet level recognized for p_cdio.
*/
uint8_t 
cdio_get_joliet_level(const CdIo *p_cdio)
{
  if (!p_cdio) return 0;
  {
    const generic_img_private_t *p_env 
      = (generic_img_private_t *) (p_cdio->env);
    return p_env->i_joliet_level;
  }
}

bool
cdio_is_device(const char *psz_source, driver_id_t driver_id)
{
  if (CdIo_all_drivers[driver_id].is_device == NULL) return false;
  return (*CdIo_all_drivers[driver_id].is_device)(psz_source);
}


/*!
  Initialize CD Reading and control routines. Should be called first.
  May be implicitly called by other routines if not called first.
*/
bool
cdio_init(void)
{
  
  CdIo_driver_t *all_dp;
  CdIo_driver_t *dp = CdIo_driver;
  driver_id_t driver_id;

  if (CdIo_last_driver != CDIO_DRIVER_UNINIT) {
    cdio_warn ("Init routine called more than once.");
    return false;
  }

  for (driver_id=DRIVER_UNKNOWN; driver_id<=CDIO_MAX_DRIVER; driver_id++) {
    all_dp = &CdIo_all_drivers[driver_id];
    if ((*CdIo_all_drivers[driver_id].have_driver)()) {
      *dp++ = *all_dp;
      CdIo_last_driver++;
    }
  }

  return true;
}

CdIo *
cdio_new (generic_img_private_t *p_env, cdio_funcs *p_funcs)
{
  CdIo *p_new_cdio = _cdio_malloc (sizeof (CdIo));

  if (NULL == p_new_cdio) return NULL;
  
  p_new_cdio->env = p_env;      /* This is the private "environment" that
                                   driver-dependent routines use. */
  p_new_cdio->op  = *p_funcs;
  p_env->cdio     = p_new_cdio; /* A way for the driver-dependent routines 
                                   to access the higher-level general cdio 
                                   object. */
  return p_new_cdio;
}

/*!
  Free any resources associated with cdio.
*/
void
cdio_destroy (CdIo *cdio)
{
  CdIo_last_driver = CDIO_DRIVER_UNINIT;
  if (cdio == NULL) return;

  if (cdio->op.free != NULL) 
    cdio->op.free (cdio->env);
  free (cdio);
}

/*!
  lseek - reposition read/write file offset
  Returns (off_t) -1 on error. 
  Similar to (if not the same as) libc's lseek()
*/
off_t
cdio_lseek (const CdIo *cdio, off_t offset, int whence)
{
  if (cdio == NULL) return -1;
  
  if (cdio->op.lseek)
    return cdio->op.lseek (cdio->env, offset, whence);
  return -1;
}

/*!
  Reads into buf the next size bytes.
  Returns -1 on error. 
  Similar to (if not the same as) libc's read()
*/
ssize_t
cdio_read (const CdIo *p_cdio, void *buf, size_t size)
{
  if (p_cdio == NULL) return -1;
  
  if (p_cdio->op.read)
    return p_cdio->op.read (p_cdio->env, buf, size);
  return -1;
}

/*!
  Reads an audio sector from cd device into data starting
  from lsn. Returns 0 if no error. 
*/
int
cdio_read_audio_sector (const CdIo *p_cdio, void *buf, lsn_t lsn) 
{

  if (NULL == p_cdio || NULL == buf || CDIO_INVALID_LSN == lsn )
    return 0;

  if  (p_cdio->op.read_audio_sectors != NULL)
    return p_cdio->op.read_audio_sectors (p_cdio->env, buf, lsn, 1);
  return -1;
}

/*!
  Reads audio sectors from cd device into data starting
  from lsn. Returns 0 if no error. 
*/
int
cdio_read_audio_sectors (const CdIo *p_cdio, void *buf, lsn_t lsn,
                         unsigned int nblocks) 
{
  if ( NULL == p_cdio || NULL == buf || CDIO_INVALID_LSN == lsn )
    return 0;

  if  (p_cdio->op.read_audio_sectors != NULL)
    return p_cdio->op.read_audio_sectors (p_cdio->env, buf, lsn, nblocks);
  return -1;
}

#ifndef SEEK_SET
#define SEEK_SET 0
#endif 

/*!
   Reads a single mode1 form1 or form2  sector from cd device 
   into data starting from lsn. Returns 0 if no error. 
 */
int
cdio_read_mode1_sector (const CdIo *p_cdio, void *data, lsn_t lsn, 
                        bool b_form2)
{
  uint32_t size = b_form2 ? M2RAW_SECTOR_SIZE : CDIO_CD_FRAMESIZE ;
  
  if (NULL == p_cdio || NULL == data || CDIO_INVALID_LSN == lsn )
    return 0;

  if (p_cdio->op.read_mode1_sector) {
    return p_cdio->op.read_mode1_sector(p_cdio->env, data, lsn, b_form2);
  } else if (p_cdio->op.lseek && p_cdio->op.read) {
    char buf[CDIO_CD_FRAMESIZE] = { 0, };
    if (0 > cdio_lseek(p_cdio, CDIO_CD_FRAMESIZE*lsn, SEEK_SET))
      return -1;
    if (0 > cdio_read(p_cdio, buf, CDIO_CD_FRAMESIZE))
      return -1;
    memcpy (data, buf, size);
    return 0;
  } 

  return 1;

}

int
cdio_read_mode1_sectors (const CdIo *cdio, void *buf, lsn_t lsn, 
                         bool b_form2,  unsigned int num_sectors)
{

  if (NULL == cdio || NULL == buf || CDIO_INVALID_LSN == lsn )
    return 0;

  cdio_assert (cdio->op.read_mode1_sectors != NULL);
  
  return cdio->op.read_mode1_sectors (cdio->env, buf, lsn, b_form2, 
                                      num_sectors);
}

/*!
   Reads a single mode2 sector from cd device into data starting
   from lsn. Returns 0 if no error. 
 */
int
cdio_read_mode2_sector (const CdIo *cdio, void *buf, lsn_t lsn, 
                        bool b_form2)
{
  if (NULL == cdio || NULL == buf || CDIO_INVALID_LSN == lsn )
    return 0;

  cdio_assert (cdio->op.read_mode2_sector != NULL 
	      || cdio->op.read_mode2_sectors != NULL);

  if (cdio->op.read_mode2_sector)
    return cdio->op.read_mode2_sector (cdio->env, buf, lsn, b_form2);

  /* fallback */
  if (cdio->op.read_mode2_sectors != NULL)
    return cdio_read_mode2_sectors (cdio, buf, lsn, b_form2, 1);
  return 1;
}

int
cdio_read_mode2_sectors (const CdIo *cdio, void *buf, lsn_t lsn, 
                         bool b_form2, unsigned int num_sectors)
{

  if (NULL == cdio || NULL == buf || CDIO_INVALID_LSN == lsn )
    return 0;

  cdio_assert (cdio->op.read_mode2_sectors != NULL);
  
  return cdio->op.read_mode2_sectors (cdio->env, buf, lsn,
                                      b_form2, num_sectors);
}

uint32_t
cdio_stat_size (const CdIo *cdio)
{
  cdio_assert (cdio != NULL);

  return cdio->op.stat_size (cdio->env);
}

/*!
  Set the arg "key" with "value" in the source device.
*/
int
cdio_set_arg (CdIo *cdio, const char key[], const char value[])
{
  cdio_assert (cdio != NULL);
  cdio_assert (cdio->op.set_arg != NULL);
  cdio_assert (key != NULL);

  return cdio->op.set_arg (cdio->env, key, value);
}

/*! Sets up to read from place specified by source_name and
  driver_id. This should be called before using any other routine,
  except cdio_init. This will call cdio_init, if that hasn't been
  done previously.
  
  NULL is returned on error.
*/
CdIo *
cdio_open (const char *orig_source_name, driver_id_t driver_id)
{
  return cdio_open_am(orig_source_name, driver_id, NULL);
}

/*! Sets up to read from place specified by source_name and
  driver_id. This should be called before using any other routine,
  except cdio_init. This will call cdio_init, if that hasn't been
  done previously.
  
  NULL is returned on error.
*/
CdIo *
cdio_open_am (const char *psz_orig_source, driver_id_t driver_id,
              const char *psz_access_mode)
{
  char *psz_source;
  
  if (CdIo_last_driver == -1) cdio_init();

  if (NULL == psz_orig_source || strlen(psz_orig_source)==0) 
    psz_source = cdio_get_default_device(NULL);
  else 
    psz_source = strdup(psz_orig_source);
  
  switch (driver_id) {
  case DRIVER_UNKNOWN: 
    {
      CdIo *cdio=scan_for_driver(CDIO_MIN_DRIVER, CDIO_MAX_DRIVER, 
                                 psz_source, psz_access_mode);
      free(psz_source);
      return cdio;
    }
  case DRIVER_DEVICE: 
    {  
      /* Scan for a driver. */
      CdIo *ret = cdio_open_am_cd(psz_source, psz_access_mode);
      free(psz_source);
      return ret;
    }
    break;
  case DRIVER_BSDI:
  case DRIVER_FREEBSD:
  case DRIVER_LINUX:
  case DRIVER_SOLARIS:
  case DRIVER_WIN32:
  case DRIVER_OSX:
  case DRIVER_NRG:
  case DRIVER_BINCUE:
  case DRIVER_CDRDAO:
    if ((*CdIo_all_drivers[driver_id].have_driver)()) {
      CdIo *ret = 
        (*CdIo_all_drivers[driver_id].driver_open_am)(psz_source, 
                                                      psz_access_mode);
      if (ret) ret->driver_id = driver_id;
      free(psz_source);
      return ret;
    }
  }

  free(psz_source);
  return NULL;
}


/*! 
  Set up CD-ROM for reading. The device_name is
  the some sort of device name.
  
  @return the cdio object for subsequent operations. 
  NULL on error or there is no driver for a some sort of hardware CD-ROM.
*/
CdIo *
cdio_open_cd (const char *psz_source)
{
  return cdio_open_am_cd(psz_source, NULL);
}

/*! 
  Set up CD-ROM for reading. The device_name is
  the some sort of device name.
  
  @return the cdio object for subsequent operations. 
  NULL on error or there is no driver for a some sort of hardware CD-ROM.
*/
/* In the future we'll have more complicated code to allow selection
   of an I/O routine as well as code to find an appropriate default
   routine among the "registered" routines. Possibly classes too
   disk-based, SCSI-based, native-based, vendor (e.g. Sony, or
   Plextor) based 

   For now though, we'll start more simply...
*/
CdIo *
cdio_open_am_cd (const char *psz_source, const char *psz_access_mode)
{
  if (CdIo_last_driver == -1) cdio_init();

  /* Scan for a driver. */
  return scan_for_driver(CDIO_MIN_DEVICE_DRIVER, CDIO_MAX_DEVICE_DRIVER, 
                         psz_source, psz_access_mode);
}



/* 
 * Local variables:
 *  c-file-style: "gnu"
 *  tab-width: 8
 *  indent-tabs-mode: nil
 * End:
 */