480 lines
20 KiB
Plaintext
480 lines
20 KiB
Plaintext
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libburnia-project.org scdbackup.sourceforge.net/cdrskin_eng.html
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------------------------------------------------------------------------------
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cdrskin. By Thomas Schmitt <scdbackup@gmx.net>
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Integrated sub project of libburnia-project.org but also published via:
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http://scdbackup.sourceforge.net/cdrskin_eng.html
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http://scdbackup.sourceforge.net/cdrskin-0.5.2.pl00.tar.gz
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Copyright (C) 2006-2008 Thomas Schmitt, provided under GPL version 2.
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------------------------------------------------------------------------------
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cdrskin is a limited cdrecord compatibility wrapper which allows to use
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most of the libburn features from the command line.
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Currently it is only supported on Linux with kernels >= 2.4.
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By using this software you agree to the disclaimer at the end of this text
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"This software is provided as is. There is no warranty implied and ..."
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Compilation, First Glimpse, Installation
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Obtain cdrskin-0.5.2.pl00.tar.gz, take it to a directory of your choice and do:
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tar xzf cdrskin-0.5.2.pl00.tar.gz
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cd cdrskin-0.5.2
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Within that directory execute:
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./configure --prefix=/usr
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make
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This will already produce a cdrskin binary. But it will be necessary to
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install libburn in order to use this binary. Installation of libburn is
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beyond the scope of cdrskin. For this, see included libburn docs.
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In order to surely get a standalone binary, execute
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cdrskin/compile_cdrskin.sh
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Version identification and help texts available afterwards:
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cdrskin/cdrskin -version
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cdrskin/cdrskin --help
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cdrskin/cdrskin -help
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man cdrskin/cdrskin.1
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Install (eventually as superuser) cdrskin to a directory where it can be found:
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The command for global installation of both, libburn and cdrskin is
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make install
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If the library libburn.so.4 is not found with a test run of cdrskin, then
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try whether command
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ldconfig
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makes it accessible. With the statically linked binary this should not matter.
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With that static binary you may as well do the few necessary actions manually.
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If cdrskin was already installed by a previous version, or by "make install"
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in the course of this installation, then find out where:
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which cdrskin
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Copy your standalone binary to exactly the address which you get as reply.
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E.g.:
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cp cdrskin/cdrskin /usr/bin/cdrskin
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Check the version timestamps of the globally installed binary
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cdrskin -version
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It is not necessary for the standalone cdrskin binary to have libburn
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installed, since it incorporates the necessary libburn parts at compile time.
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It will not collide with an installed version of libburn either.
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But libpthread must be installed on the system and glibc has to match. (See
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below for a way to create a statically linked binary.)
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To install the man page, you may do: echo $MANPATH and choose one of the
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listed directories to copy the man-page under its ./man1 directory. Like:
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cp cdrskin/cdrskin.1 /usr/share/man/man1/cdrskin.1
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Note: The content of the cdrskin tarball is essentially the complete libburn
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of the same version number. You may thus perform above steps in a local
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SVN copy of libburn or in a unpacked libburn tarball as well.
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Usage
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The user of cdrskin needs rw-permission for the CD burner device.
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A list of rw-accessible drives can be obtained by
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cdrskin --devices
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CD devices which offer no rw-permission are invisible to normal users.
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The superuser should be able to see any usable drive and then set the
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permissions as needed. If this hangs then there is a drive with
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unexpected problems (locked, busy, broken, whatever). You might have to
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guess the address of your (non-broken) burner by other means, then.
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On Linux 2.4 this would be some /dev/sgN and on 2.6. some /dev/srM or /dev/hdX.
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The output of cdrskin --devices might look like
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0 dev='/dev/sr0' rwrwr- : '_NEC' 'DVD_RW ND-4570A'
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1 dev='/dev/sr1' rwrw-- : 'HL-DT-ST' 'DVDRAM GSA-4082B'
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So full and insecure enabling of both for everybody would look like
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chmod a+rw /dev/sr0 /dev/sr1
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This is equivalent to the traditional setup chmod a+x,u+s cdrecord.
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I strongly discourage to run cdrskin with setuid root or via sudo !
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It is not checked for the necessary degree of hacker safety.
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Consider to put all authorized users into group "floppy", to chgrp the
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device file to that group and to disallow w-access to others.
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Helpful with Linux kernel 2.4 is a special SCSI feature:
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It is possible to address a scsi(-emulated) drive via associated device files
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which are not listed by option --devices but point to the same SCSI addresses
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as listed device files. This addressing via e.g. /dev/sr0 or /dev/scd1 is
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compatible with generic read programs like dd and with write program growisofs.
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For finding /dev/sg1 from /dev/sr0, the program needs rw-access to both files.
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Usage examples
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For options and recordable media classes see
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man 1 cdrskin
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Get an overview of cdrecord style addresses of available devices
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cdrskin -scanbus
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cdrskin dev=ATA -scanbus
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cdrskin --devices
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Adresses reported with dev=ATA need prefix "ATA:". Address examples:
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dev=0,1,0 dev=ATA:1,0,0 dev=/dev/sg1 dev=/dev/hdc dev=/dev/sr0
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See also "Drive Addressing" below.
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Obtain some info about the drive
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cdrskin dev=0,1,0 -checkdrive
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Obtain some info about the drive and the inserted media
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cdrskin dev=0,1,0 -atip -v
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Prepare CD-RW or DVD-RW for re-use, DVD-RAM or BD-RE for first use
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cdrskin -v dev=/dev/sg1 blank=as_needed -eject
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Format DVD-RW to avoid need for blanking before re-use
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cdrskin -v dev=0,1,0 blank=format_overwrite
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De-format DVD-RW to make it capable of multi-session again
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cdrskin -v dev=/dev/sr0 blank=deformat_sequential
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Burn image file my_image.iso to media
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cdrskin -v dev=0,1,0 speed=12 fs=8m driveropts=burnfree padsize=300k \
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-eject my_image.iso
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Write multi-session to the same CD , DVD-R[W] or DVD+R[/DL]
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cdrskin dev=/dev/hdc padsize=300k -multi 1.iso
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cdrskin dev=/dev/hdc padsize=300k -multi 2.iso
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cdrskin dev=/dev/hdc padsize=300k -multi 3.iso
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cdrskin dev=/dev/hdc padsize=300k 4.iso
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Get multi-session info for option -C of program mkisofs:
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c_values=$(cdrskin dev=/dev/hdc -msinfo 2>/dev/null)
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mkisofs ... -C "$c_values" ...
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Burn a compressed afio archive to media on-the-fly
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find . | afio -oZ - | cdrskin -v dev=0,1,0 fs=32m speed=8 \
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driveropts=burnfree padsize=300k -
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Burn 6 audio tracks from files with different formats to CD (not to any DVD).
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Anything except .wav or .au files has to be converted into raw format first.
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See below "Audio CD" for specifications.
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ogg123 -d raw -f track01.cd /path/to/track1.ogg
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oggdec -R -o track02.cd /path/to/track2.ogg
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lame --decode -t /path/to/track3.mp3 track03.cd
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madplay -o raw:track04.cd /path/to/track4.mp3
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mppdec --raw-le /path/to/track5.mpc track05.cd
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cdrskin -v dev=0,1,0 blank=fast -eject speed=48 -sao \
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-audio -swab track0[1-5].cd /path/to/track6.wav
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Restrictions
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Several advanced CD related options of cdrecord are still unsupported.
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See output of command
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cdrskin --list_ignored_options
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If you have use cases for them, please report your wishes and expectations.
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On the other hand, the capability of multi-session and of writing streams
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of unpredicted lenght surpass the current DVD capabilities of cdrecord.
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Inspiration and Standard
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cdrskin combines the command line interface standard set by cdrecord with
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libburn, which is a control software for optical drives according to standard
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MMC-5. For particular CD legacy commands, standards MMC-3 and MMC-1 apply.
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For the original meaning of cdrecord options see :
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man cdrecord
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(http://cdrecord.berlios.de/old/private/man/cdrecord-2.0.html)
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Do not bother Joerg Schilling with any cdrskin problems.
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(Be cursed if you install cdrskin as "cdrecord" without clearly forwarding
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this "don't bother Joerg" demand.)
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cdrskin does not contain any bytes copied from cdrecord's sources. Many bytes
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have been copied from the message output of cdrecord runs, though. I am
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thankful to Joerg Schilling for every single one of them.
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I have the hope that Joerg feels more flattered than annoyed by cdrskin.
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Many thanks to Andy Polyakov for his dvd+rw-tools
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http://fy.chalmers.se/~appro/linux/DVD+RW/tools
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which provide me with examples and pointers into MMC specs for DVD writing.
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Startup Files
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If not --no_rc is the first argument then cdrskin attempts on startup to read
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arguments from the following three files:
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/etc/default/cdrskin
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/etc/opt/cdrskin/rc
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/etc/cdrskin/cdrskin.conf
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$HOME/.cdrskinrc
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The files are read in the sequence given above.
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Each readable line is treated as one single argument. No extra blanks.
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A first character '#' marks a comment, empty lines are ignored.
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Example content of a startup file:
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# This is the default device
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dev=0,1,0
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# Some more options
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fifo_start_at=0
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fs=16m
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Audio CD
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Lorenzo Taylor enabled option -audio in cdrskin (thanks !) and reports neat
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results with audio data files which are :
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headerless PCM (i.e. uncompressed)
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44100 Hz sampling rate
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16 bits per sample
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stereo (2 channels)
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little-endian byte order with option -swab, or big-endian without -swab
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Files with name extension .wav get examined wether they are in Microsoft WAVE
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format with above parameters and eventually get extracted by cdrskin itself.
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In the same way files with name extension .au get examined wether they are
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in SUN's audio format. For both formats, track format -audio and eventual
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endianness option -swab are enabled automatically.
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Any other formats are to be converted to format .wav with above parameters
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or to be extracted as raw CD track data by commands like those given above
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under "Usage examples". Those raw files need option -audio and in most cases
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option -swab to mark them as little-endian/Intel/LSB-first 16-bit data.
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Incorrect endianness setting results in random noise on CD.
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I myself am not into audio. So libburn-hackers@pykix.org might be the
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best address for suggestions, requests and bug reports.
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DVD+RW , DVD-RAM , BD-RE
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These random access media get treated as blank media regardless wether they
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hold data or not. Options -audio and -multi are not allowed. Only one track
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is allowed. -toc does not return information about the media content.
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Speed is counted in DVD units (i.e. 1x = 1,385,000 bytes/second) or BD units
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(1x = 4,495,625 bytes/second). Currently there is no difference between -sao
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and -tao. If ever, then -tao will be the mode which preserves the current
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behavior.
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BD-RE media need formatting before first use. cdrskin option "blank=as_needed"
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recognizes unformatted BD-RE and applies a lengthy formatting run.
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During write operations DVD-RAM and BD-RE automatically apply defect
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management. This usually slows them down to half nominal speed. If drive
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and media produce flawless results anyway, then one can try to reach full
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nominal speed by option "stream_recording=on".
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In this case bad blocks are not detected during write and not even previously
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known bad blocks are avoided. So you have to make your own readability tests
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and go back to half speed as soon as the first read errors show up.
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Option --grow_overwriteable_iso allows -multi (although unneeded), enables
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-msinfo and -toc, and makes blank=fast an invalidator for ISO filesystems
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on overwriteable media.
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Initial session (equivalent to growisofs -Z):
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mkisofs ... | cdrskin --grow_overwriteable_iso blank=fast ...
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Add-on session (equivalent to growisofs -M):
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cparms=$(cdrskin dev=/dev/sr0 --grow_overwriteable_iso -msinfo)
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mkisofs -C "$cparms" -M /dev/sr0 ... | \
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cdrskin dev=/dev/sr0 --grow_overwriteable_iso ... -
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DVD-RW and DVD-R
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DVD-RW are usable if formatted to state "Restricted Overwrite" or if in state
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"Sequential Recording". DVD-R are always in sequential state.
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"Sequential" is the state of unused media and of media previously blanked
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or written by cdrecord. dvd+rw-format -blank can also achieve this state.
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The according cdrskin option is blank=deformat_sequential .
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If "Incremental Streaming" is available, then sequential media are capable
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of multi-session like CD-R[W]. (But not capable of -audio recording.)
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This means they need option -multi to stay appendable, need to be blanked
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to be writeable from start, return useable info with -toc and -msinfo,
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eventually perform appending automatically.
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Without Incremental Streaming offered by the drive, only write mode DAO is
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available with sequential DVD-R[W]. It only works with blank media, allows only
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one single track, no -multi, and demands a fixely predicted track size.
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(growisofs uses it with DVD-R[W] if option -dvd-compat is given.)
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Overwriteable DVD-RW behave much like DVD+RW. "Restricted" refers only to the
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granularity of random access and block size which have always to be aligned to
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full 32 kB. Sequential DVD-RW are converted into overwriteable DVD-RW by
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cdrskin dev=... -v blank=format_overwrite
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(Command dvd+rw-format -force can achieve Restricted Overwrite, too.)
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Formatting or first use of freshly formatted DVD-RW can produce unusual noises
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from the drive and last several minutes. Depending on mutual compatibility of
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drive and media, formatting can yield unusable media. It seems that those die
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too on blanking by cdrecord, dvd+rw-format or cdrskin. Perils of DVD-RW.
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There are three DVD-RW formatting variants with cdrskin currently:
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blank=format_overwrite uses "DVD-RW Quick" formatting (MMC-type 15h)
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and writes a first session of 128 MiB. This leads to media which are expandable
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and random addressable by cdrskin.
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blank=format_overwrite_quickest uses "DVD-RW Quick" formatting (type 15h) too,
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but leaves the media in "intermediate" state. In the first session of writing
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one may only write sequentially to such a DVD. After that, it gets random
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addressable by cdrskin. DVD-ROM drives might show ill behavior with them.
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blank=format_overwrite_full uses preferrably "Full Format" (type 00h).
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This formatting lasts as long as writing a full DVD. It includes writing of
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lead-out which is said to be good for DVD ROM compatibility.
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De-formatting options are available to make overwriteable DVD-RW sequential:
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blank=deformat_sequential performs thorough blanking of all states of DVD-RW.
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blank=all and blank=fast perform the same thorough blanking, but refuse to do
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this with overwriteable DVD-RW, thus preserving their formatting. The specs
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allow minimal blanking but the resulting media on my drives offer no
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Incremental Streaming afterwards. So blank=fast will do full blanking.
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blank=deformat_sequential_quickest is faster but might yield DAO-only media.
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DVD+R and DVD+R DL
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From the view of cdrskin they behave much like DVD-R. Each track gets wrapped
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into an own session, though.
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DVD+R DL appear as extra large DVD+R. cdrskin does not allow to set the address
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of the layer break where a reading drive might show some delay while switching
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between both media layers.
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Emulated Drives
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cdrskin can use filesystem objects as emulated drives. Regular files or block
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devices appear similar to DVD-RAM. Other file types resemble blank DVD-R.
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Necessary precondition is option --allow_emulated_drives which is not accepted
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if cdrskin took another user identity because of the setuid bit of its access
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permissions.
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Addresses of emulated drives begin with prefix "stdio:". E.g.
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dev=stdio:/tmp/my_pseudo_drive
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For safety reasons the superuser is only allowed to use /dev/null as emulated
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drive. See man page section FILES for a way to lift that ban.
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------------------------------------------------------------------------------
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Special compilation variations
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You may get a (super fat) statically linked binary by :
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cdrskin/compile_cdrskin.sh -static
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if your system supports static linking, at all. This will not help with kernels
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which do not properly support the necessary low-level interfaces chosen by
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your compile-time libraries.
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A size reduced but fully functional binary may be produced by
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cdrskin/compile_cdrskin.sh -do_strip
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An extra lean binary with reduced capabilities is created by
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cdrskin/compile_cdrskin.sh -do_diet -do_strip
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It will not read startup files, will abort on option dev_translation= ,
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will not have a fifo buffer, and will not be able to put out help texts or
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debugging messages.
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------------------------------------------------------------------------------
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Project aspects and legal stuff
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------------------------------------------------------------------------------
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Important Disclaimer :
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This software is provided as is. There is no warranty implied and no
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protection against possible damages. You use this on your own risk.
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Don't blame me or other authors of libburn if anything goes wrong.
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Actually, in case of severe trouble, nearly always the drive and the media
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are the cause. Any mistake of the burn program is supposed to be caught
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by the drive's firmware and to lead to mere misburns.
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The worst mishaps which hit the author imposed the need to reboot the
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system because of drives gnawing endlessly on ill media. Permanent hardware
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damage did not occur in 2.5 years of development. But one never knows ...
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------------------------------------------------------------------------------
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Interested users are invited to participate in the development of cdrskin.
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Contact: scdbackup@gmx.net or libburn-hackers@pykix.org .
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We will keep copyright narrow but will of course acknowledge valuable
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contributions in a due way.
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------------------------------------------------------------------------------
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License version 2
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as published by the Free Software Foundation.
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This program 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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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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------------------------------------------------------------------------------
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Based on and sub project of:
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libburnia-project.org
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By Mario Danic <mario.danic@gmail.com> and Thomas Schmitt <scdbackup@gmx.net>
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Copyright (C) 2006-2008 Mario Danic, Thomas Schmitt
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libburnia-project.org is inspired by and in other components still containing
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parts of
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Libburn. By Derek Foreman <derek@signalmarketing.com> and
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Ben Jansens <xor@orodu.net>
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Copyright (C) 2002-2006 Derek Foreman and Ben Jansens
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See toplevel README for an overview of the current copyright situation in
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libburnia-project.org.
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------------------------------------------------------------------------------
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cdrskin is currently copyright Thomas Schmitt only.
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It adopts the following commitment by the toplevel copyright holders:
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------------------------------------------------------------------------------
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We, the copyright holders, agree on the interpretation that
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dynamical linking of our libraries constitutes "use of" and
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not "derivation from" our work in the sense of GPL, provided
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those libraries are compiled from our unaltered code.
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Thus you may link our libraries dynamically with applications
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which are not under GPL. You may distribute our libraries and
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application tools in binary form, if you fulfill the usual
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condition of GPL to offer a copy of the source code -altered
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or unaltered- under GPL.
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We ask you politely to use our work in open source spirit
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and with the due reference to the entire open source community.
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If there should really arise the case where above clarification
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does not suffice to fulfill a clear and neat request in open source
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spirit that would otherwise be declined for mere formal reasons,
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only in that case we will duely consider to issue a special license
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covering only that special case.
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It is the open source idea of responsible freedom which will be
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decisive and you will have to prove that you exhausted all own
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means to qualify for GPL.
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For now we are firmly committed to maintain one single license: GPL.
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signed for cdrskin: Thomas Schmitt
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