345 lines
13 KiB
C
345 lines
13 KiB
C
/*
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* Copyright (C) 2001, 2002 Billy Biggs <vektor@dumbterm.net>,
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* Håkan Hjort <d95hjort@dtek.chalmers.se>,
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* Björn Englund <d4bjorn@dtek.chalmers.se>
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*
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* This file is part of libdvdread.
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*
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* libdvdread is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* libdvdread is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with libdvdread; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/**
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* The DVD access interface.
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*
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* This file contains the functions that form the interface to to
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* reading files located on a DVD.
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*/
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/**
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* The current version.
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*/
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/**
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* The length of one Logical Block of a DVD.
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*/
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#define DVD_VIDEO_LB_LEN 2048
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/**
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* Maximum length of filenames allowed in UDF.
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*/
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#define MAX_UDF_FILE_NAME_LEN 2048
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typedef long int off_t;
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/**
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* Opaque type that is used as a handle for one instance of an opened DVD.
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*/
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typedef struct dvd_reader_s dvd_reader_t;
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typedef struct dvd_reader_device_s dvd_reader_device_t;
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/**
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* Opaque type for a file read handle, much like a normal fd or FILE *.
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*/
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typedef struct dvd_file_s dvd_file_t;
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struct dvd_reader_stream_cb
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{
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int ( *pf_seek ) ( void *p_stream, uint64_t i_pos);
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int ( *pf_read ) ( void *p_stream, void* buffer, int i_read);
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int ( *pf_readv ) ( void *p_stream, void *p_iovec, int i_blocks);
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};
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typedef struct dvd_reader_stream_cb dvd_reader_stream_cb;
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/**
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* Custom logger callback for DVDOpen[Stream]2
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* @param private Handle as provided in Open functions
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* @param level Log level
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* @param fmt Format string
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* @param args Arguments list
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* pf_log(priv, level, fmt, args);
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*/
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typedef enum
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{
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DVD_LOGGER_LEVEL_INFO,
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DVD_LOGGER_LEVEL_ERROR,
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DVD_LOGGER_LEVEL_WARN,
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DVD_LOGGER_LEVEL_DEBUG,
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} dvd_logger_level_t;
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typedef struct
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{
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// void ( *pf_log ) ( void *, dvd_logger_level_t, const char *, va_list );
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void *pf_log;
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} dvd_logger_cb;
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/**
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* Public type that is used to provide statistics on a handle.
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*/
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typedef struct {
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off_t size; /**< Total size of file in bytes */
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int nr_parts; /**< Number of file parts */
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off_t parts_size[9]; /**< Size of each part in bytes */
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} dvd_stat_t;
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/**
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* Opens a block device of a DVD-ROM file, or an image file, or a directory
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* name for a mounted DVD or HD copy of a DVD.
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* The second form of Open function (DVDOpenStream) can be used to
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* provide custom stream_cb functions to access the DVD (see libdvdcss).
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*
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* If the given file is a block device, or is the mountpoint for a block
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* device, then that device is used for CSS authentication using libdvdcss.
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* If no device is available, then no CSS authentication is performed,
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* and we hope that the image is decrypted.
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*
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* If the path given is a directory, then the files in that directory may be
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* in any one of these formats:
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*
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* path/VIDEO_TS/VTS_01_1.VOB
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* path/video_ts/vts_01_1.vob
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* path/VTS_01_1.VOB
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* path/vts_01_1.vob
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*
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* @param path Specifies the the device, file or directory to be used.
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* @param stream is a private handle used by stream_cb
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* @param stream_cb is a struct containing seek and read functions
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* @return If successful a a read handle is returned. Otherwise 0 is returned.
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*
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* dvd = DVDOpen(path);
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* dvd = DVDOpenStream(stream, &stream_cb);
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*/
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dvd_reader_t *DVDOpen( const char * );
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dvd_reader_t *DVDOpenStream( void *, dvd_reader_stream_cb * );
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/**
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* Same as DVDOpen, but with private handle to be passed back on callbacks
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*
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* @param path Specifies the the device, file or directory to be used.
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* @param priv is a private handle
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* @param logcb is a custom logger callback struct, or NULL if none needed
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* @param stream_cb is a struct containing seek and read functions
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* @return If successful a a read handle is returned. Otherwise 0 is returned.
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*
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* dvd = DVDOpen2(priv, logcb, path);
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* dvd = DVDOpenStream2(priv, logcb, &stream_cb);
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*/
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dvd_reader_t *DVDOpen2( void *, const dvd_logger_cb *, const char * );
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dvd_reader_t *DVDOpenStream2( void *, const dvd_logger_cb *, dvd_reader_stream_cb * );
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/**
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* Closes and cleans up the DVD reader object.
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*
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* You must close all open files before calling this function.
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*
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* @param dvd A read handle that should be closed.
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*
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* DVDClose(dvd);
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*/
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void DVDClose( dvd_reader_t * );
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/**
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*
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*/
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typedef enum {
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DVD_READ_INFO_FILE, /**< VIDEO_TS.IFO or VTS_XX_0.IFO (title) */
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DVD_READ_INFO_BACKUP_FILE, /**< VIDEO_TS.BUP or VTS_XX_0.BUP (title) */
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DVD_READ_MENU_VOBS, /**< VIDEO_TS.VOB or VTS_XX_0.VOB (title) */
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DVD_READ_TITLE_VOBS /**< VTS_XX_[1-9].VOB (title). All files in
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the title set are opened and read as a
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single file. */
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} dvd_read_domain_t;
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/**
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* Stats a file on the DVD given the title number and domain.
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* The information about the file is stored in a dvd_stat_t
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* which contains information about the size of the file and
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* the number of parts in case of a multipart file and the respective
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* sizes of the parts.
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* A multipart file is for instance VTS_02_1.VOB, VTS_02_2.VOB, VTS_02_3.VOB
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* The size of VTS_02_1.VOB will be stored in stat->parts_size[0],
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* VTS_02_2.VOB in stat->parts_size[1], ...
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* The total size (sum of all parts) is stored in stat->size and
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* stat->nr_parts will hold the number of parts.
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* Only DVD_READ_TITLE_VOBS (VTS_??_[1-9].VOB) can be multipart files.
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*
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* This function is only of use if you want to get the size of each file
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* in the filesystem. These sizes are not needed to use any other
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* functions in libdvdread.
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*
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* @param dvd A dvd read handle.
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* @param titlenum Which Video Title Set should be used, VIDEO_TS is 0.
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* @param domain Which domain.
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* @param stat Pointer to where the result is stored.
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* @return If successful 0, otherwise -1.
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*
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* int DVDFileStat(dvd, titlenum, domain, stat);
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*/
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int DVDFileStat(dvd_reader_t *, int, dvd_read_domain_t, dvd_stat_t *);
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/**
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* Opens a file on the DVD given the title number and domain.
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*
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* If the title number is 0, the video manager information is opened
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* (VIDEO_TS.[IFO,BUP,VOB]). Returns a file structure which may be
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* used for reads, or 0 if the file was not found.
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*
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* @param dvd A dvd read handle.
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* @param titlenum Which Video Title Set should be used, VIDEO_TS is 0.
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* @param domain Which domain.
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* @return If successful a a file read handle is returned, otherwise 0.
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*
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* dvd_file = DVDOpenFile(dvd, titlenum, domain); */
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dvd_file_t *DVDOpenFile( dvd_reader_t *, int, dvd_read_domain_t );
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/**
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* Closes a file and frees the associated structure.
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*
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* @param dvd_file The file read handle to be closed.
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*
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* DVDCloseFile(dvd_file);
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*/
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void DVDCloseFile( dvd_file_t * );
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/**
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* Reads block_count number of blocks from the file at the given block offset.
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* Returns number of blocks read on success, -1 on error. This call is only
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* for reading VOB data, and should not be used when reading the IFO files.
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* When reading from an encrypted drive, blocks are decrypted using libdvdcss
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* where required.
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*
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* @param dvd_file A file read handle.
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* @param offset Block offset from the start of the file to start reading at.
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* @param block_count Number of block to read.
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* @param data Pointer to a buffer to write the data into.
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* @return Returns number of blocks read on success, -1 on error.
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*
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* blocks_read = DVDReadBlocks(dvd_file, offset, block_count, data);
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*/
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ssize_t DVDReadBlocks( dvd_file_t *, int, size_t, unsigned char * );
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/**
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* Seek to the given position in the file. Returns the resulting position in
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* bytes from the beginning of the file. The seek position is only used for
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* byte reads from the file, the block read call always reads from the given
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* offset.
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*
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* @param dvd_file A file read handle.
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* @param seek_offset Byte offset from the start of the file to seek to.
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* @return The resulting position in bytes from the beginning of the file.
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*
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* offset_set = DVDFileSeek(dvd_file, seek_offset);
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*/
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int32_t DVDFileSeek( dvd_file_t *, int32_t );
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/**
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* Reads the given number of bytes from the file. This call can only be used
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* on the information files, and may not be used for reading from a VOB. This
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* reads from and increments the currrent seek position for the file.
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*
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* @param dvd_file A file read handle.
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* @param data Pointer to a buffer to write the data into.
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* @param bytes Number of bytes to read.
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* @return Returns number of bytes read on success, -1 on error.
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*
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* bytes_read = DVDReadBytes(dvd_file, data, bytes);
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*/
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ssize_t DVDReadBytes( dvd_file_t *, void *, size_t );
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/**
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* Returns the file size in blocks.
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*
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* @param dvd_file A file read handle.
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* @return The size of the file in blocks, -1 on error.
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*
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* blocks = DVDFileSize(dvd_file);
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*/
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ssize_t DVDFileSize( dvd_file_t * );
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/**
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* Get a unique 128 bit disc ID.
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* This is the MD5 sum of VIDEO_TS.IFO and the VTS_0?_0.IFO files
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* in title order (those that exist).
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* If you need a 'text' representation of the id, print it as a
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* hexadecimal number, using lowercase letters, discid[0] first.
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* I.e. the same format as the command-line 'md5sum' program uses.
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*
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* @param dvd A read handle to get the disc ID from
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* @param discid The buffer to put the disc ID into. The buffer must
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* have room for 128 bits (16 chars).
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* @return 0 on success, -1 on error.
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*/
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int DVDDiscID( dvd_reader_t *, unsigned char * );
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/**
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* Get the UDF VolumeIdentifier and VolumeSetIdentifier
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* from the PrimaryVolumeDescriptor.
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*
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* @param dvd A read handle to get the disc ID from
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* @param volid The buffer to put the VolumeIdentifier into.
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* The VolumeIdentifier is latin-1 encoded (8bit unicode)
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* null terminated and max 32 bytes (including '\0')
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* @param volid_size No more than volid_size bytes will be copied to volid.
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* If the VolumeIdentifier is truncated because of this
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* it will still be null terminated.
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* @param volsetid The buffer to put the VolumeSetIdentifier into.
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* The VolumeIdentifier is 128 bytes as
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* stored in the UDF PrimaryVolumeDescriptor.
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* Note that this is not a null terminated string.
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* @param volsetid_size At most volsetid_size bytes will be copied to volsetid.
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* @return 0 on success, -1 on error.
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*/
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int DVDUDFVolumeInfo( dvd_reader_t *, char *, unsigned int,
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unsigned char *, unsigned int );
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int DVDFileSeekForce( dvd_file_t *, int offset, int force_size);
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/**
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* Get the ISO9660 VolumeIdentifier and VolumeSetIdentifier
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*
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* * Only use this function as fallback if DVDUDFVolumeInfo returns 0 *
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* * this will happen on a disc mastered only with a iso9660 filesystem *
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* * All video DVD discs have UDF filesystem *
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*
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* @param dvd A read handle to get the disc ID from
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* @param volid The buffer to put the VolumeIdentifier into.
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* The VolumeIdentifier is coded with '0-9','A-Z','_'
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* null terminated and max 33 bytes (including '\0')
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* @param volid_size No more than volid_size bytes will be copied to volid.
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* If the VolumeIdentifier is truncated because of this
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* it will still be null terminated.
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* @param volsetid The buffer to put the VolumeSetIdentifier into.
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* The VolumeIdentifier is 128 bytes as
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* stored in the ISO9660 PrimaryVolumeDescriptor.
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* Note that this is not a null terminated string.
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* @param volsetid_size At most volsetid_size bytes will be copied to volsetid.
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* @return 0 on success, -1 on error.
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*/
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int DVDISOVolumeInfo( dvd_reader_t *, char *, unsigned int,
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unsigned char *, unsigned int );
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/**
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* Sets the level of caching that is done when reading from a device
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*
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* @param dvd A read handle to get the disc ID from
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* @param level The level of caching wanted.
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* -1 - returns the current setting.
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* 0 - UDF Cache turned off.
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* 1 - (default level) Pointers to IFO files and some data from
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* PrimaryVolumeDescriptor are cached.
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*
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* @return The level of caching.
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*/
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int DVDUDFCacheLevel( dvd_reader_t *, int );
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