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mirror of https://github.com/mpv-player/mpv synced 2024-12-23 23:32:26 +00:00
mpv/libdvdcss/libdvdcss.c
reimar 6b1453c615 Ignore if we fail to get disc key, fixes playback of one of my DVDs which
claims to be scrambled but actually is not, and always allows to
fallback to cached keys.


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@26266 b3059339-0415-0410-9bf9-f77b7e298cf2
2008-03-21 12:31:47 +00:00

796 lines
24 KiB
C

/* libdvdcss.c: DVD reading library.
*
* Authors: Stéphane Borel <stef@via.ecp.fr>
* Samuel Hocevar <sam@zoy.org>
* Håkan Hjort <d95hjort@dtek.chalmers.se>
*
* Copyright (C) 1998-2002 VideoLAN
* $Id$
*
* 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, USA.
*/
/**
* \mainpage libdvdcss developer documentation
*
* \section intro Introduction
*
* \e libdvdcss is a simple library designed for accessing DVDs like a block
* device without having to bother about the decryption. The important features
* are:
* \li portability: currently supported platforms are GNU/Linux, FreeBSD,
* NetBSD, OpenBSD, BSD/OS, BeOS, Windows 95/98, Windows NT/2000, MacOS X,
* Solaris, HP-UX and OS/2.
* \li adaptability: unlike most similar projects, libdvdcss doesn't require
* the region of your drive to be set and will try its best to read from
* the disc even in the case of a region mismatch.
* \li simplicity: a DVD player can be built around the \e libdvdcss API using
* no more than 4 or 5 library calls.
*
* \e libdvdcss is free software, released under the General Public License.
* This ensures that \e libdvdcss remains free and used only with free
* software.
*
* \section api The libdvdcss API
*
* The complete \e libdvdcss programming interface is documented in the
* dvdcss.h file.
*
* \section env Environment variables
*
* Some environment variables can be used to change the behaviour of
* \e libdvdcss without having to modify the program which uses it. These
* variables are:
*
* \li \b DVDCSS_VERBOSE: sets the verbosity level.
* - \c 0 outputs no messages at all.
* - \c 1 outputs error messages to stderr.
* - \c 2 outputs error messages and debug messages to stderr.
*
* \li \b DVDCSS_METHOD: sets the authentication and decryption method
* that \e libdvdcss will use to read scrambled discs. Can be one
* of \c title, \c key or \c disc.
* - \c key is the default method. \e libdvdcss will use a set of
* calculated player keys to try and get the disc key. This can fail
* if the drive does not recognize any of the player keys.
* - \c disc is a fallback method when \c key has failed. Instead of
* using player keys, \e libdvdcss will crack the disc key using
* a brute force algorithm. This process is CPU intensive and requires
* 64 MB of memory to store temporary data.
* - \c title is the fallback when all other methods have failed. It does
* not rely on a key exchange with the DVD drive, but rather uses a
* crypto attack to guess the title key. On rare cases this may fail
* because there is not enough encrypted data on the disc to perform
* a statistical attack, but in the other hand it is the only way to
* decrypt a DVD stored on a hard disc, or a DVD with the wrong region
* on an RPC2 drive.
*
* \li \b DVDCSS_RAW_DEVICE: specify the raw device to use. Exact usage will
* depend on your operating system, the Linux utility to set up raw devices
* is \c raw(8) for instance. Please note that on most operating systems,
* using a raw device requires highly aligned buffers: Linux requires a
* 2048 bytes alignment (which is the size of a DVD sector).
*
* \li \b DVDCSS_CACHE: specify a directory in which to store title key
* values. This will speed up descrambling of DVDs which are in the
* cache. The DVDCSS_CACHE directory is created if it does not exist,
* and a subdirectory is created named after the DVD's title or
* manufacturing date. If DVDCSS_CACHE is not set or is empty, \e libdvdcss
* will use the default value which is "${HOME}/.dvdcss/" under Unix and
* "C:\Documents and Settings\$USER\Application Data\dvdcss\" under Win32.
* The special value "off" disables caching.
*/
/*
* Preamble
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#ifdef HAVE_SYS_PARAM_H
# include <sys/param.h>
#endif
#ifdef HAVE_PWD_H
# include <pwd.h>
#endif
#include <fcntl.h>
#include <errno.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#ifdef HAVE_LIMITS_H
# include <limits.h>
#endif
#ifdef HAVE_DIRECT_H
# include <direct.h>
#endif
#include "dvdcss/dvdcss.h"
#include "common.h"
#include "css.h"
#include "libdvdcss.h"
#include "ioctl.h"
#include "device.h"
/**
* \brief Symbol for version checks.
*
* The name of this symbol contains the library major number, which makes it
* easy to check which \e libdvdcss development headers are installed on the
* system with tools such as autoconf.
*
* The variable itself contains the exact version number of the library,
* which can be useful for specific feature needs.
*/
char * dvdcss_interface_2 = VERSION;
/**
* \brief Open a DVD device or directory and return a dvdcss instance.
*
* \param psz_target a string containing the target name, for instance
* "/dev/hdc" or "E:".
* \return a handle to a dvdcss instance or NULL on error.
*
* Initialize the \e libdvdcss library and open the requested DVD device or
* directory. \e libdvdcss checks whether ioctls can be performed on the disc,
* and when possible, the disc key is retrieved.
*
* dvdcss_open() returns a handle to be used for all subsequent \e libdvdcss
* calls. If an error occurred, NULL is returned.
*/
LIBDVDCSS_EXPORT dvdcss_t dvdcss_open ( char *psz_target )
{
char psz_buffer[PATH_MAX];
int i_ret;
char *psz_method = getenv( "DVDCSS_METHOD" );
char *psz_verbose = getenv( "DVDCSS_VERBOSE" );
char *psz_cache = getenv( "DVDCSS_CACHE" );
#ifndef WIN32
char *psz_raw_device = getenv( "DVDCSS_RAW_DEVICE" );
#endif
dvdcss_t dvdcss;
/*
* Allocate the library structure
*/
dvdcss = malloc( sizeof( struct dvdcss_s ) );
if( dvdcss == NULL )
{
return NULL;
}
/*
* Initialize structure with default values
*/
#ifndef WIN32
dvdcss->i_raw_fd = -1;
#endif
dvdcss->p_titles = NULL;
dvdcss->psz_device = (char *)strdup( psz_target );
dvdcss->psz_error = "no error";
dvdcss->i_method = DVDCSS_METHOD_KEY;
dvdcss->psz_cachefile[0] = '\0';
dvdcss->b_debug = 0;
dvdcss->b_errors = 0;
/*
* Find verbosity from DVDCSS_VERBOSE environment variable
*/
if( psz_verbose != NULL )
{
int i = atoi( psz_verbose );
if( i >= 2 ) dvdcss->b_debug = i;
if( i >= 1 ) dvdcss->b_errors = 1;
}
/*
* Find method from DVDCSS_METHOD environment variable
*/
if( psz_method != NULL )
{
if( !strncmp( psz_method, "key", 4 ) )
{
dvdcss->i_method = DVDCSS_METHOD_KEY;
}
else if( !strncmp( psz_method, "disc", 5 ) )
{
dvdcss->i_method = DVDCSS_METHOD_DISC;
}
else if( !strncmp( psz_method, "title", 5 ) )
{
dvdcss->i_method = DVDCSS_METHOD_TITLE;
}
else
{
print_error( dvdcss, "unknown decrypt method, please choose "
"from 'title', 'key' or 'disc'" );
free( dvdcss->psz_device );
free( dvdcss );
return NULL;
}
}
/*
* If DVDCSS_CACHE was not set, try to guess a default value
*/
if( psz_cache == NULL || psz_cache[0] == '\0' )
{
#ifdef HAVE_DIRECT_H
typedef HRESULT( WINAPI *SHGETFOLDERPATH )
( HWND, int, HANDLE, DWORD, LPTSTR );
# define CSIDL_FLAG_CREATE 0x8000
# define CSIDL_APPDATA 0x1A
# define SHGFP_TYPE_CURRENT 0
char psz_home[MAX_PATH];
HINSTANCE p_dll;
SHGETFOLDERPATH p_getpath;
*psz_home = '\0';
/* Load the shfolder dll to retrieve SHGetFolderPath */
p_dll = LoadLibrary( "shfolder.dll" );
if( p_dll )
{
p_getpath = (void*)GetProcAddress( p_dll, "SHGetFolderPathA" );
if( p_getpath )
{
/* Get the "Application Data" folder for the current user */
if( p_getpath( NULL, CSIDL_APPDATA | CSIDL_FLAG_CREATE,
NULL, SHGFP_TYPE_CURRENT, psz_home ) == S_OK )
{
FreeLibrary( p_dll );
}
else
{
*psz_home = '\0';
}
}
FreeLibrary( p_dll );
}
/* Cache our keys in
* C:\Documents and Settings\$USER\Application Data\dvdcss\ */
if( *psz_home )
{
snprintf( psz_buffer, PATH_MAX, "%s/dvdcss", psz_home );
psz_buffer[PATH_MAX-1] = '\0';
psz_cache = psz_buffer;
}
#else
char *psz_home = NULL;
# ifdef HAVE_PWD_H
struct passwd *p_pwd;
/* Try looking in password file for home dir. */
p_pwd = getpwuid(getuid());
if( p_pwd )
{
psz_home = p_pwd->pw_dir;
}
# endif
if( psz_home == NULL )
{
psz_home = getenv( "HOME" );
}
if( psz_home == NULL )
{
psz_home = getenv( "USERPROFILE" );
}
/* Cache our keys in ${HOME}/.dvdcss/ */
if( psz_home )
{
snprintf( psz_buffer, PATH_MAX, "%s/.dvdcss", psz_home );
psz_buffer[PATH_MAX-1] = '\0';
psz_cache = psz_buffer;
}
#endif
}
/*
* Find cache dir from the DVDCSS_CACHE environment variable
*/
if( psz_cache != NULL )
{
if( psz_cache[0] == '\0' || !strcmp( psz_cache, "off" ) )
{
psz_cache = NULL;
}
/* Check that we can add the ID directory and the block filename */
else if( strlen( psz_cache ) + 1 + 32 + 1 + (KEY_SIZE * 2) + 10 + 1
> PATH_MAX )
{
print_error( dvdcss, "cache directory name is too long" );
psz_cache = NULL;
}
}
/*
* Open device
*/
_dvdcss_check( dvdcss );
i_ret = _dvdcss_open( dvdcss );
if( i_ret < 0 )
{
free( dvdcss->psz_device );
free( dvdcss );
return NULL;
}
dvdcss->b_scrambled = 1; /* Assume the worst */
dvdcss->b_ioctls = _dvdcss_use_ioctls( dvdcss );
if( dvdcss->b_ioctls )
{
i_ret = _dvdcss_test( dvdcss );
if( i_ret < 0 )
{
/* Disable the CSS ioctls and hope that it works? */
print_debug( dvdcss,
"could not check whether the disc was scrambled" );
dvdcss->b_ioctls = 0;
}
else
{
print_debug( dvdcss, i_ret ? "disc is scrambled"
: "disc is unscrambled" );
dvdcss->b_scrambled = i_ret;
}
}
/* If disc is CSS protected and the ioctls work, authenticate the drive */
if( dvdcss->b_scrambled && dvdcss->b_ioctls )
{
i_ret = _dvdcss_disckey( dvdcss );
if( i_ret < 0 )
{
print_debug( dvdcss,
"could not get disc key" );
}
}
/* If the cache is enabled, write the cache directory tag */
if( psz_cache )
{
char *psz_tag = "Signature: 8a477f597d28d172789f06886806bc55\r\n"
"# This file is a cache directory tag created by libdvdcss.\r\n"
"# For information about cache directory tags, see:\r\n"
"# http://www.brynosaurus.com/cachedir/\r\n";
char psz_tagfile[PATH_MAX + 1 + 12 + 1];
int i_fd;
sprintf( psz_tagfile, "%s/CACHEDIR.TAG", psz_cache );
i_fd = open( psz_tagfile, O_RDWR|O_CREAT, 0644 );
if( i_fd >= 0 )
{
write( i_fd, psz_tag, strlen(psz_tag) );
close( i_fd );
}
}
/* If the cache is enabled, extract a unique disc ID */
if( psz_cache )
{
uint8_t p_sector[DVDCSS_BLOCK_SIZE];
char psz_debug[PATH_MAX + 30];
char psz_key[1 + KEY_SIZE * 2 + 1];
char *psz_title;
uint8_t *psz_serial;
int i;
/* We read sector 0. If it starts with 0x000001ba (BE), we are
* reading a VOB file, and we should not cache anything. */
i_ret = dvdcss->pf_seek( dvdcss, 0 );
if( i_ret != 0 )
{
goto nocache;
}
i_ret = dvdcss->pf_read( dvdcss, p_sector, 1 );
if( i_ret != 1 )
{
goto nocache;
}
if( p_sector[0] == 0x00 && p_sector[1] == 0x00
&& p_sector[2] == 0x01 && p_sector[3] == 0xba )
{
goto nocache;
}
/* The data we are looking for is at sector 16 (32768 bytes):
* - offset 40: disc title (32 uppercase chars)
* - offset 813: manufacturing date + serial no (16 digits) */
i_ret = dvdcss->pf_seek( dvdcss, 16 );
if( i_ret != 16 )
{
goto nocache;
}
i_ret = dvdcss->pf_read( dvdcss, p_sector, 1 );
if( i_ret != 1 )
{
goto nocache;
}
/* Get the disc title */
psz_title = (char *)p_sector + 40;
psz_title[32] = '\0';
for( i = 0 ; i < 32 ; i++ )
{
if( psz_title[i] <= ' ' )
{
psz_title[i] = '\0';
break;
}
else if( psz_title[i] == '/' || psz_title[i] == '\\' )
{
psz_title[i] = '-';
}
}
/* Get the date + serial */
psz_serial = p_sector + 813;
psz_serial[16] = '\0';
/* Check that all characters are digits, otherwise convert. */
for( i = 0 ; i < 16 ; i++ )
{
if( psz_serial[i] < '0' || psz_serial[i] > '9' )
{
char psz_tmp[16 + 1];
sprintf( psz_tmp,
"%.2"PRIx8"%.2"PRIx8"%.2"PRIx8"%.2"PRIx8"%.2"PRIx8"%.2"PRIx8"%.2"PRIx8"%.2"PRIx8"",
psz_serial[0], psz_serial[1], psz_serial[2],
psz_serial[3], psz_serial[4], psz_serial[5],
psz_serial[6], psz_serial[7] );
memcpy( psz_serial, psz_tmp, 16 );
break;
}
}
/* Get disk key, since some discs have got same title, manufacturing
* date and serial number, but different keys */
if( dvdcss->b_scrambled )
{
psz_key[0] = '-';
for( i = 0; i < KEY_SIZE; i++ )
{
sprintf( &psz_key[1+i*2], "%.2"PRIx8, dvdcss->css.p_disc_key[i] );
}
psz_key[1 + KEY_SIZE * 2] = '\0';
}
else
{
psz_key[0] = 0;
}
/* We have a disc name or ID, we can create the cache dir */
i = sprintf( dvdcss->psz_cachefile, "%s", psz_cache );
#if !defined( WIN32 ) || defined( SYS_CYGWIN )
i_ret = mkdir( dvdcss->psz_cachefile, 0755 );
#else
i_ret = mkdir( dvdcss->psz_cachefile );
#endif
if( i_ret < 0 && errno != EEXIST )
{
print_error( dvdcss, "failed creating cache directory" );
dvdcss->psz_cachefile[0] = '\0';
goto nocache;
}
i += sprintf( dvdcss->psz_cachefile + i, "/%s-%s%s", psz_title,
psz_serial, psz_key );
#if !defined( WIN32 ) || defined( SYS_CYGWIN )
i_ret = mkdir( dvdcss->psz_cachefile, 0755 );
#else
i_ret = mkdir( dvdcss->psz_cachefile );
#endif
if( i_ret < 0 && errno != EEXIST )
{
print_error( dvdcss, "failed creating cache subdirectory" );
dvdcss->psz_cachefile[0] = '\0';
goto nocache;
}
i += sprintf( dvdcss->psz_cachefile + i, "/");
/* Pointer to the filename we will use. */
dvdcss->psz_block = dvdcss->psz_cachefile + i;
sprintf( psz_debug, "using CSS key cache dir: %s",
dvdcss->psz_cachefile );
print_debug( dvdcss, psz_debug );
}
nocache:
#ifndef WIN32
if( psz_raw_device != NULL )
{
_dvdcss_raw_open( dvdcss, psz_raw_device );
}
#endif
/* Seek at the beginning, just for safety. */
dvdcss->pf_seek( dvdcss, 0 );
return dvdcss;
}
/**
* \brief Return a string containing the latest error that occurred in the
* given \e libdvdcss instance.
*
* \param dvdcss a \e libdvdcss instance.
* \return a null-terminated string containing the latest error message.
*
* This function returns a constant string containing the latest error that
* occurred in \e libdvdcss. It can be used to format error messages at your
* convenience in your application.
*/
LIBDVDCSS_EXPORT char * dvdcss_error ( dvdcss_t dvdcss )
{
return dvdcss->psz_error;
}
/**
* \brief Seek in the disc and change the current key if requested.
*
* \param dvdcss a \e libdvdcss instance.
* \param i_blocks an absolute block offset to seek to.
* \param i_flags #DVDCSS_NOFLAGS, optionally ored with one of #DVDCSS_SEEK_KEY
* or #DVDCSS_SEEK_MPEG.
* \return the new position in blocks, or a negative value in case an error
* happened.
*
* This function seeks to the requested position, in logical blocks.
*
* You typically set \p i_flags to #DVDCSS_NOFLAGS when seeking in a .IFO.
*
* If #DVDCSS_SEEK_MPEG is specified in \p i_flags and if \e libdvdcss finds it
* reasonable to do so (ie, if the dvdcss method is not "title"), the current
* title key will be checked and a new one will be calculated if necessary.
* This flag is typically used when reading data from a VOB.
*
* If #DVDCSS_SEEK_KEY is specified, the title key will be always checked,
* even with the "title" method. This is equivalent to using the now
* deprecated dvdcss_title() call. This flag is typically used when seeking
* in a new title.
*/
LIBDVDCSS_EXPORT int dvdcss_seek ( dvdcss_t dvdcss, int i_blocks, int i_flags )
{
/* title cracking method is too slow to be used at each seek */
if( ( ( i_flags & DVDCSS_SEEK_MPEG )
&& ( dvdcss->i_method != DVDCSS_METHOD_TITLE ) )
|| ( i_flags & DVDCSS_SEEK_KEY ) )
{
/* check the title key */
if( _dvdcss_title( dvdcss, i_blocks ) )
{
return -1;
}
}
return dvdcss->pf_seek( dvdcss, i_blocks );
}
/**
* \brief Read from the disc and decrypt data if requested.
*
* \param dvdcss a \e libdvdcss instance.
* \param p_buffer a buffer that will contain the data read from the disc.
* \param i_blocks the amount of blocks to read.
* \param i_flags #DVDCSS_NOFLAGS, optionally ored with #DVDCSS_READ_DECRYPT.
* \return the amount of blocks read, or a negative value in case an
* error happened.
*
* This function reads \p i_blocks logical blocks from the DVD.
*
* You typically set \p i_flags to #DVDCSS_NOFLAGS when reading data from a
* .IFO file on the DVD.
*
* If #DVDCSS_READ_DECRYPT is specified in \p i_flags, dvdcss_read() will
* automatically decrypt scrambled sectors. This flag is typically used when
* reading data from a .VOB file on the DVD. It has no effect on unscrambled
* discs or unscrambled sectors, and can be safely used on those.
*
* \warning dvdcss_read() expects to be able to write \p i_blocks *
* #DVDCSS_BLOCK_SIZE bytes in \p p_buffer.
*/
LIBDVDCSS_EXPORT int dvdcss_read ( dvdcss_t dvdcss, void *p_buffer,
int i_blocks,
int i_flags )
{
int i_ret, i_index;
i_ret = dvdcss->pf_read( dvdcss, p_buffer, i_blocks );
if( i_ret <= 0
|| !dvdcss->b_scrambled
|| !(i_flags & DVDCSS_READ_DECRYPT) )
{
return i_ret;
}
if( ! memcmp( dvdcss->css.p_title_key, "\0\0\0\0\0", 5 ) )
{
/* For what we believe is an unencrypted title,
* check that there are no encrypted blocks */
for( i_index = i_ret; i_index; i_index-- )
{
if( ((uint8_t*)p_buffer)[0x14] & 0x30 )
{
print_error( dvdcss, "no key but found encrypted block" );
/* Only return the initial range of unscrambled blocks? */
/* or fail completely? return 0; */
break;
}
p_buffer = (void *) ((uint8_t *)p_buffer + DVDCSS_BLOCK_SIZE);
}
}
else
{
/* Decrypt the blocks we managed to read */
for( i_index = i_ret; i_index; i_index-- )
{
_dvdcss_unscramble( dvdcss->css.p_title_key, p_buffer );
((uint8_t*)p_buffer)[0x14] &= 0x8f;
p_buffer = (void *) ((uint8_t *)p_buffer + DVDCSS_BLOCK_SIZE);
}
}
return i_ret;
}
/**
* \brief Read from the disc into multiple buffers and decrypt data if
* requested.
*
* \param dvdcss a \e libdvdcss instance.
* \param p_iovec a pointer to an array of iovec structures that will contain
* the data read from the disc.
* \param i_blocks the amount of blocks to read.
* \param i_flags #DVDCSS_NOFLAGS, optionally ored with #DVDCSS_READ_DECRYPT.
* \return the amount of blocks read, or a negative value in case an
* error happened.
*
* This function reads \p i_blocks logical blocks from the DVD and writes them
* to an array of iovec structures.
*
* You typically set \p i_flags to #DVDCSS_NOFLAGS when reading data from a
* .IFO file on the DVD.
*
* If #DVDCSS_READ_DECRYPT is specified in \p i_flags, dvdcss_readv() will
* automatically decrypt scrambled sectors. This flag is typically used when
* reading data from a .VOB file on the DVD. It has no effect on unscrambled
* discs or unscrambled sectors, and can be safely used on those.
*
* \warning dvdcss_readv() expects to be able to write \p i_blocks *
* #DVDCSS_BLOCK_SIZE bytes in the buffers pointed by \p p_iovec.
* Moreover, all iov_len members of the iovec structures should be
* multiples of #DVDCSS_BLOCK_SIZE.
*/
LIBDVDCSS_EXPORT int dvdcss_readv ( dvdcss_t dvdcss, void *p_iovec,
int i_blocks,
int i_flags )
{
struct iovec *_p_iovec = (struct iovec *)p_iovec;
int i_ret, i_index;
void *iov_base;
size_t iov_len;
i_ret = dvdcss->pf_readv( dvdcss, _p_iovec, i_blocks );
if( i_ret <= 0
|| !dvdcss->b_scrambled
|| !(i_flags & DVDCSS_READ_DECRYPT) )
{
return i_ret;
}
/* Initialize loop for decryption */
iov_base = _p_iovec->iov_base;
iov_len = _p_iovec->iov_len;
/* Decrypt the blocks we managed to read */
for( i_index = i_ret; i_index; i_index-- )
{
/* Check that iov_len is a multiple of 2048 */
if( iov_len & 0x7ff )
{
return -1;
}
while( iov_len == 0 )
{
_p_iovec++;
iov_base = _p_iovec->iov_base;
iov_len = _p_iovec->iov_len;
}
_dvdcss_unscramble( dvdcss->css.p_title_key, iov_base );
((uint8_t*)iov_base)[0x14] &= 0x8f;
iov_base = (void *) ((uint8_t*)iov_base + DVDCSS_BLOCK_SIZE);
iov_len -= DVDCSS_BLOCK_SIZE;
}
return i_ret;
}
/**
* \brief Close the DVD and clean up the library.
*
* \param dvdcss a \e libdvdcss instance.
* \return zero in case of success, a negative value otherwise.
*
* This function closes the DVD device and frees all the memory allocated
* by \e libdvdcss. On return, the #dvdcss_t is invalidated and may not be
* used again.
*/
LIBDVDCSS_EXPORT int dvdcss_close ( dvdcss_t dvdcss )
{
dvd_title_t *p_title;
int i_ret;
/* Free our list of keys */
p_title = dvdcss->p_titles;
while( p_title )
{
dvd_title_t *p_tmptitle = p_title->p_next;
free( p_title );
p_title = p_tmptitle;
}
i_ret = _dvdcss_close( dvdcss );
if( i_ret < 0 )
{
return i_ret;
}
free( dvdcss->psz_device );
free( dvdcss );
return 0;
}
/*
* Deprecated. See dvdcss_seek().
*/
#undef dvdcss_title
LIBDVDCSS_EXPORT int dvdcss_title ( dvdcss_t dvdcss, int i_block )
{
return _dvdcss_title( dvdcss, i_block );
}