_cdio_generic.c

linux下的MPEG1

/*
    $Id: _cdio_generic.c,v 1.3 2005/01/01 02:43:57 rockyb Exp $

    Copyright (C) 2004 Rocky Bernstein <[e-mail]>

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program 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 General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

/* This file contains generic implementations of device-dirver routines.
*/

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

static const char _rcsid[] = "$Id: _cdio_generic.c,v 1.3 2005/01/01 02:43:57 rockyb Exp $";

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>

#ifdef HAVE_UNISTD_H
#include <unistd.h> 
#endif /*HAVE_UNISTD_H*/

#include <fcntl.h>

#include <sys/stat.h>
#include <sys/types.h>

#include <cdio/sector.h>
#include <cdio/util.h>
#include <cdio/logging.h>
#include "cdio_assert.h"
#include "cdio_private.h"
#include "_cdio_stdio.h"
#include "portable.h"

/*!
  Eject media -- there's nothing to do here. We always return 2.
  Should we also free resources? 
 */
int 
cdio_generic_bogus_eject_media (void *user_data) {
  /* Sort of a stub here. Perhaps log a message? */
  return 2;
}


/*!
  Release and free resources associated with cd. 
 */
void
cdio_generic_free (void *p_user_data)
{
  generic_img_private_t *p_env = p_user_data;
  track_t i_track;

  if (NULL == p_env) return;
  free (p_env->source_name);

  for (i_track=0; i_track < p_env->i_tracks; i_track++) {
    cdtext_destroy(&(p_env->cdtext_track[i_track]));
  }

  if (p_env->fd >= 0)
    close (p_env->fd);

  free (p_env);
}

/*!
  Initialize CD device.
 */
bool
cdio_generic_init (void *user_data)
{
  generic_img_private_t *p_env = user_data;
  if (p_env->init) {
    cdio_warn ("init called more than once");
    return false;
  }
  
  p_env->fd = open (p_env->source_name, O_RDONLY, 0);

  if (p_env->fd < 0)
    {
      cdio_warn ("open (%s): %s", p_env->source_name, strerror (errno));
      return false;
    }

  p_env->init = true;
  p_env->toc_init = false;
  p_env->b_cdtext_init  = false;
  p_env->b_cdtext_error = false;
  p_env->i_joliet_level = 0;  /* Assume no Joliet extensions initally */
  return true;
}

/*!
   Reads a single form1 sector from cd device into data starting
   from lsn. Returns 0 if no error. 
 */
int
cdio_generic_read_form1_sector (void * user_data, void *data, lsn_t lsn)
{
  if (0 > cdio_generic_lseek(user_data, CDIO_CD_FRAMESIZE*lsn, SEEK_SET))
    return -1;
  if (0 > cdio_generic_read(user_data, data, CDIO_CD_FRAMESIZE))
    return -1;
  return 0;
}

/*!
  Reads into buf the next size bytes.
  Returns -1 on error. 
  Is in fact libc's lseek().
*/
off_t
cdio_generic_lseek (void *user_data, off_t offset, int whence)
{
  generic_img_private_t *p_env = user_data;
  return lseek(p_env->fd, offset, whence);
}

/*!
  Reads into buf the next size bytes.
  Returns -1 on error. 
  Is in fact libc's read().
*/
ssize_t
cdio_generic_read (void *user_data, void *buf, size_t size)
{
  generic_img_private_t *p_env = user_data;
  return read(p_env->fd, buf, size);
}

/*!
  Release and free resources associated with stream or disk image.
*/
void
cdio_generic_stdio_free (void *user_data)
{
  generic_img_private_t *p_env = user_data;

  if (NULL == p_env) return;
  if (NULL != p_env->source_name) 
    free (p_env->source_name);

  if (p_env->data_source)
    cdio_stdio_destroy (p_env->data_source);
}


/*!  
  Return true if source_name could be a device containing a CD-ROM.
*/
bool
cdio_is_device_generic(const char *source_name)
{
  struct stat buf;
  if (0 != stat(source_name, &buf)) {
    cdio_warn ("Can't get file status for %s:\n%s", source_name, 
		strerror(errno));
    return false;
  }
  return (S_ISBLK(buf.st_mode) || S_ISCHR(buf.st_mode));
}

/*!  
  Like above, but don't give a warning device doesn't exist.
*/
bool
cdio_is_device_quiet_generic(const char *source_name)
{
  struct stat buf;
  if (0 != stat(source_name, &buf)) {
    return false;
  }
  return (S_ISBLK(buf.st_mode) || S_ISCHR(buf.st_mode));
}

/*! 
  Add/allocate a drive to the end of drives. 
  Use cdio_free_device_list() to free this device_list.
*/
void 
cdio_add_device_list(char **device_list[], const char *drive, 
		     unsigned int *num_drives)
{
  if (NULL != drive) {
    unsigned int j;

    /* Check if drive is already in list. */
    for (j=0; j<*num_drives; j++) {
      if (strcmp((*device_list)[j], drive) == 0) break;
    }

    if (j==*num_drives) {
      /* Drive not in list. Add it. */
      (*num_drives)++;
      if (*device_list) {
	*device_list = realloc(*device_list, (*num_drives) * sizeof(char *));
      } else {
	/* num_drives should be 0. Add assert? */
	*device_list = malloc((*num_drives) * sizeof(char *));
      }
      
      (*device_list)[*num_drives-1] = strdup(drive);
    }
  } else {
    (*num_drives)++;
    if (*device_list) {
      *device_list = realloc(*device_list, (*num_drives) * sizeof(char *));
    } else {
      *device_list = malloc((*num_drives) * sizeof(char *));
    }
    (*device_list)[*num_drives-1] = NULL;
  }
}


/*! 
  Get cdtext information for a CdIo object .
  
  @param obj the CD object that may contain CD-TEXT information.
  @return the CD-TEXT object or NULL if obj is NULL
  or CD-TEXT information does not exist.
*/
const cdtext_t *
get_cdtext_generic (void *p_user_data, track_t i_track)
{
  generic_img_private_t *p_env = p_user_data;

  if ( NULL == p_env ||
       (0 != i_track 
	&& i_track >= p_env->i_tracks+p_env->i_first_track ) )
    return NULL;

  if (!p_env->b_cdtext_init)
    init_cdtext_generic(p_env);
  if (!p_env->b_cdtext_init) return NULL;

  if (0 == i_track) 
    return &(p_env->cdtext);
  else 
    return &(p_env->cdtext_track[i_track-p_env->i_first_track]);

}

/*! 
  Get disc type associated with cd object.
*/
discmode_t
get_discmode_generic (void *p_user_data )
{
  generic_img_private_t *p_env = p_user_data;

  /* See if this is a DVD. */
  cdio_dvd_struct_t dvd;  /* DVD READ STRUCT for layer 0. */

  dvd.physical.type = CDIO_DVD_STRUCT_PHYSICAL;
  dvd.physical.layer_num = 0;
  if (0 == scsi_mmc_get_dvd_struct_physical (p_env->cdio, &dvd)) {
    switch(dvd.physical.layer[0].book_type) {
    case CDIO_DVD_BOOK_DVD_ROM:  return CDIO_DISC_MODE_DVD_ROM;
    case CDIO_DVD_BOOK_DVD_RAM:  return CDIO_DISC_MODE_DVD_RAM;
    case CDIO_DVD_BOOK_DVD_R:    return CDIO_DISC_MODE_DVD_R;
    case CDIO_DVD_BOOK_DVD_RW:   return CDIO_DISC_MODE_DVD_RW;
    case CDIO_DVD_BOOK_DVD_PR:   return CDIO_DISC_MODE_DVD_PR;
    case CDIO_DVD_BOOK_DVD_PRW:  return CDIO_DISC_MODE_DVD_PRW;
    default: return CDIO_DISC_MODE_DVD_OTHER;
    }
  }

  return get_discmode_cd_generic(p_user_data);
}

/*! 
  Get disc type associated with cd object.
*/
discmode_t
get_discmode_cd_generic (void *p_user_data )
{
  generic_img_private_t *p_env = p_user_data;
  track_t i_track;
  discmode_t discmode=CDIO_DISC_MODE_NO_INFO;

  if (!p_env->toc_init) 
    p_env->cdio->op.read_toc (p_user_data);

  if (!p_env->toc_init) 
    return CDIO_DISC_MODE_NO_INFO;

  for (i_track = p_env->i_first_track; 
       i_track < p_env->i_first_track + p_env->i_tracks ; 
       i_track ++) {
    track_format_t track_fmt =
      p_env->cdio->op.get_track_format(p_env, i_track);

    switch(track_fmt) {
    case TRACK_FORMAT_AUDIO:
      switch(discmode) {
	case CDIO_DISC_MODE_NO_INFO:
	  discmode = CDIO_DISC_MODE_CD_DA;
	  break;
	case CDIO_DISC_MODE_CD_DA:
	case CDIO_DISC_MODE_CD_MIXED: 
	case CDIO_DISC_MODE_ERROR: 
	  /* No change*/
	  break;
      default:
	  discmode = CDIO_DISC_MODE_CD_MIXED;
      }
      break;
    case TRACK_FORMAT_XA:
      switch(discmode) {
	case CDIO_DISC_MODE_NO_INFO:
	  discmode = CDIO_DISC_MODE_CD_XA;
	  break;
	case CDIO_DISC_MODE_CD_XA:
	case CDIO_DISC_MODE_CD_MIXED: 
	case CDIO_DISC_MODE_ERROR: 
	  /* No change*/
	  break;
      default:
	discmode = CDIO_DISC_MODE_CD_MIXED;
      }
      break;
    case TRACK_FORMAT_DATA:
      switch(discmode) {
	case CDIO_DISC_MODE_NO_INFO:
	  discmode = CDIO_DISC_MODE_CD_DATA;
	  break;
	case CDIO_DISC_MODE_CD_DATA:
	case CDIO_DISC_MODE_CD_MIXED: 
	case CDIO_DISC_MODE_ERROR: 
	  /* No change*/
	  break;
      default:
	discmode = CDIO_DISC_MODE_CD_MIXED;
      }
      break;
    case TRACK_FORMAT_ERROR:
    default:
      discmode = CDIO_DISC_MODE_ERROR;
    }
  }
  return discmode;
}

/*!
  Return the number of of the first track. 
  CDIO_INVALID_TRACK is returned on error.
*/
track_t
get_first_track_num_generic(void *p_user_data) 
{
  generic_img_private_t *p_env = p_user_data;
  
  if (!p_env->toc_init) 
    p_env->cdio->op.read_toc (p_user_data);

  return p_env->toc_init ? p_env->i_first_track : CDIO_INVALID_TRACK;
}


/*!
  Return the number of tracks in the current medium.
*/
 track_t
get_num_tracks_generic(void *p_user_data)
{
  generic_img_private_t *p_env = p_user_data;
  
  if (!p_env->toc_init) 
    p_env->cdio->op.read_toc (p_user_data);

  return p_env->toc_init ? p_env->i_tracks : CDIO_INVALID_TRACK;
}

void
set_cdtext_field_generic(void *user_data, track_t i_track, 
		       track_t i_first_track,
		       cdtext_field_t e_field, const char *psz_value)
{
  char **pp_field;
  generic_img_private_t *env = user_data;
  
  if( i_track == 0 )
    pp_field = &(env->cdtext.field[e_field]);
  
  else
    pp_field = &(env->cdtext_track[i_track-i_first_track].field[e_field]);

  *pp_field = strdup(psz_value);
}

/*!
  Read CD-Text information for a CdIo object .
  
  return true on success, false on error or CD-TEXT information does
  not exist.
*/
bool
init_cdtext_generic (generic_img_private_t *p_env)
{
  return scsi_mmc_init_cdtext_private( p_env,
				       p_env->cdio->op.run_scsi_mmc_cmd, 
				       set_cdtext_field_generic
				       );
}