dvdcss.h File Reference

The libdvdcss public header. More...

Go to the source code of this file.

Data Structures
struct	dvdcss_stream_cb

Macros
#define	DVDCSS_BLOCK_SIZE   2048
#define	DVDCSS_NOFLAGS   0
#define	DVDCSS_READ_DECRYPT   (1 << 0)
#define	DVDCSS_SEEK_MPEG   (1 << 0)
#define	DVDCSS_SEEK_KEY   (1 << 1)
#define	LIBDVDCSS_EXPORT   extern

Typedefs
typedef struct dvdcss_s *	dvdcss_t
typedef struct dvdcss_stream_cb	dvdcss_stream_cb

Functions
LIBDVDCSS_EXPORT dvdcss_t	dvdcss_open (const char *psz_target)
	Open a DVD device or directory and return a dvdcss instance. More...
LIBDVDCSS_EXPORT dvdcss_t	dvdcss_open_stream (void *p_stream, dvdcss_stream_cb *p_stream_cb)
	Open a DVD device using dvdcss_stream_cb. More...
LIBDVDCSS_EXPORT int	dvdcss_close (dvdcss_t)
	Clean up library state and structures. More...
LIBDVDCSS_EXPORT int	dvdcss_seek (dvdcss_t, int i_blocks, int i_flags)
	Seek in the disc and change the current key if requested. More...
LIBDVDCSS_EXPORT int	dvdcss_read (dvdcss_t, void *p_buffer, int i_blocks, int i_flags)
	Read from the disc and decrypt data if requested. More...
LIBDVDCSS_EXPORT int	dvdcss_readv (dvdcss_t, void *p_iovec, int i_blocks, int i_flags)
	Read data from the disc into multiple buffers and decrypt data if requested. More...
LIBDVDCSS_EXPORT const char *	dvdcss_error (const dvdcss_t)
	Return a string containing the last error that occurred in the given libdvdcss instance. More...
LIBDVDCSS_EXPORT int	dvdcss_is_scrambled (dvdcss_t)
	Detect whether or not a DVD is scrambled. More...

Detailed Description

The libdvdcss public header.

Author

Stéphane Borel stef@.nosp@m.via..nosp@m.ecp.f.nosp@m.r

Sam Hocevar sam@z.nosp@m.oy.o.nosp@m.rg

Public types and functions that describe the API of the libdvdcss library.

Macro Definition Documentation

DVDCSS_BLOCK_SIZE

#define DVDCSS_BLOCK_SIZE   2048

The block size of a DVD.

DVDCSS_NOFLAGS

#define DVDCSS_NOFLAGS   0

The default flag to be used by libdvdcss functions.

DVDCSS_READ_DECRYPT

#define DVDCSS_READ_DECRYPT   (1 << 0)

Flag to ask dvdcss_read() to decrypt the data it reads.

DVDCSS_SEEK_KEY

#define DVDCSS_SEEK_KEY   (1 << 1)

Flag to ask dvdcss_seek() to check the current title key.

DVDCSS_SEEK_MPEG

#define DVDCSS_SEEK_MPEG   (1 << 0)

Flag to tell dvdcss_seek() it is seeking in MPEG data.

LIBDVDCSS_EXPORT

#define LIBDVDCSS_EXPORT   extern

Macro for setting symbol storage-class or visibility. Define LIBDVDCSS_IMPORTS before importing this header to get the correct DLL storage-class when using libdvdcss from MSVC.

Typedef Documentation

dvdcss_stream_cb

typedef struct dvdcss_stream_cb dvdcss_stream_cb

Set of callbacks to access DVDs in custom ways.

dvdcss_t

typedef struct dvdcss_s* dvdcss_t

Library instance handle, to be used for each library call.

Function Documentation

dvdcss_close()

LIBDVDCSS_EXPORT int dvdcss_close

(

dvdcss_t

dvdcss

)

Clean up library state and structures.

Parameters

dvdcss

a libdvdcss instance

Returns

zero in case of success, a negative value otherwise.

Close the DVD device and free all the memory allocated by libdvdcss. On return, the dvdcss_t is invalidated and may not be used again.

dvdcss_error()

LIBDVDCSS_EXPORT const char* dvdcss_error

(

const dvdcss_t

dvdcss

)

Return a string containing the last error that occurred in the given libdvdcss instance.

Parameters

dvdcss

a libdvdcss instance

Returns

a NULL-terminated string containing the last error message.

Return a string with the last error message produced by libdvdcss. Useful to conveniently format error messages in external applications.

dvdcss_is_scrambled()

LIBDVDCSS_EXPORT int dvdcss_is_scrambled

(

dvdcss_t

dvdcss

)

Detect whether or not a DVD is scrambled.

Parameters

dvdcss

a libdvdcss instance.

Returns

1 if the DVD is scrambled, 0 otherwise.

dvdcss_open()

LIBDVDCSS_EXPORT dvdcss_t dvdcss_open

(

const char *

psz_target

)

Open a DVD device or directory and return a dvdcss instance.

Parameters

psz_target

a string containing the target name, for instance "/dev/hdc" or "E:"

Returns

a handle to a dvdcss instance or NULL on error.

Initialize the libdvdcss library, open the requested DVD device or directory, and return a handle to be used for all subsequent libdvdcss calls. libdvdcss checks whether ioctls can be performed on the disc, and when possible, the disc key is retrieved.

dvdcss_open_stream()

LIBDVDCSS_EXPORT dvdcss_t dvdcss_open_stream	(	void *	p_stream,
		dvdcss_stream_cb *	p_stream_cb
	)

Open a DVD device using dvdcss_stream_cb.

Parameters

p_stream	a private handle used by p_stream_cb
p_stream_cb	a struct containing seek and read functions

Returns

a handle to a dvdcss instance or NULL on error.

See also

dvdcss_open()

dvdcss_read()

LIBDVDCSS_EXPORT int dvdcss_read	(	dvdcss_t	dvdcss,
		void *	p_buffer,
		int	i_blocks,
		int	i_flags
	)

Read from the disc and decrypt data if requested.

Parameters

dvdcss	a libdvdcss instance
p_buffer	a buffer that will contain the data read from the disc
i_blocks	the amount of blocks to read
i_flags	DVDCSS_NOFLAGS, optionally ORed with DVDCSS_READ_DECRYPT

Returns

the amount of blocks read or a negative value in case an error happened.

Read i_blocks logical blocks from the DVD.

You typically set i_flags to DVDCSS_NOFLAGS when reading data from a .IFO file on the DVD.

If DVDCSS_READ_DECRYPT is specified in 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 i_blocks * DVDCSS_BLOCK_SIZE bytes into p_buffer.

References DVDCSS_BLOCK_SIZE, and DVDCSS_READ_DECRYPT.

dvdcss_readv()

LIBDVDCSS_EXPORT int dvdcss_readv	(	dvdcss_t	dvdcss,
		void *	p_iovec,
		int	i_blocks,
		int	i_flags
	)

Read data from the disc into multiple buffers and decrypt data if requested.

Parameters

dvdcss	a libdvdcss instance
p_iovec	a pointer to an array of iovec structures that will contain the data read from the disc
i_blocks	the amount of blocks to read
i_flags	DVDCSS_NOFLAGS, optionally ORed with DVDCSS_READ_DECRYPT

Returns

the amount of blocks read or a negative value in case an error happened.

Read i_blocks logical blocks from the DVD and write them to an array of iovec structures.

You typically set i_flags to DVDCSS_NOFLAGS when reading data from a .IFO file on the DVD.

If DVDCSS_READ_DECRYPT is specified in 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 i_blocks * DVDCSS_BLOCK_SIZE bytes into the buffers pointed by p_iovec. Moreover, all iov_len members of the iovec structures should be multiples of DVDCSS_BLOCK_SIZE.

References DVDCSS_BLOCK_SIZE, and DVDCSS_READ_DECRYPT.

dvdcss_seek()

LIBDVDCSS_EXPORT int dvdcss_seek	(	dvdcss_t	dvdcss,
		int	i_blocks,
		int	i_flags
	)

Seek in the disc and change the current key if requested.

Parameters

dvdcss	a libdvdcss instance
i_blocks	an absolute block offset to seek to
i_flags	DVDCSS_NOFLAGS, optionally ORed with one of DVDCSS_SEEK_KEY or DVDCSS_SEEK_MPEG

Returns

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 i_flags to DVDCSS_NOFLAGS when seeking in a .IFO.

If DVDCSS_SEEK_MPEG is specified in i_flags and if libdvdcss finds it reasonable to do so (i.e., 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 file.

If DVDCSS_SEEK_KEY is specified, the title key will always be checked, even with the "title" method. This flag is typically used when seeking in a new title.

References DVDCSS_SEEK_KEY, and DVDCSS_SEEK_MPEG.