Updated about DVD-R[W] blanking, multi-session info and TOC
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doc/cookbook.txt
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doc/cookbook.txt
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@ -1,9 +1,10 @@
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libburnia.pykix.org Optical Media Rotisserie Recipes as of January 2007
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libburnia.pykix.org Optical Media Rotisserie Recipes as of February 2007
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Content:
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- TAO Multi-Session CD Cookbook (CD-R, CD-RW)
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- SAO CD Cookbook (CD-R, CD-RW, pure audio or pure data only)
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- Overwriteable DVD Cookbook (DVD-RAM, DVD+RW, DVD-RW)
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- Sequential DVD-R[W] Cookbook (Multi-session only. No DAO for now.)
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-------------------------------------------------------------------------------
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@ -41,15 +42,16 @@ CD media have to be blank or appendable in order to be writeable in TAO mode.
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The according status may be inquired by 51h READ DISC INFORMATION requesting
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Data Type 000b Standard Disc Information, where reply value Disc Status
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indicates:
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00b blank
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01b appendable
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10b finalized
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11b others (unsuitable for this recipe)
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00b blank
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01b appendable
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10b finalized
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11b others (unsuitable for this recipe)
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(mmc5r03c.pdf 6.22.3.1.4)
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CD-RW which are finalized or appendable may be blanked by command A1h BLANK
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with blanking types 000b "Blank the disc" or 001b "Minimally blank the disc".
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The Start Address/Track Number will be ignored so it may well be 0.
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Because the operation is long running it is advised to set the Immed bit and to
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watch the progress by commands 00h TEST UNIT READY and 03h REQUEST SENSE
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with DESC bit set to 0 for fixed format reply.
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@ -669,9 +671,10 @@ of Intermediate state by 5Bh CLOSE TRACK SESSION with Close Function 010b.
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(mmc5r03c.pdf 6.3.3.2.3)
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-------------------------------------------------------------------------------
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-------------------------------------------------------------------------------
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Sequential DVD-R[W] Cookbook
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(emerging, still incomplete)
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-------------------------------------------------------------------------------
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Inspired by Andy Polyakov's http://fy.chalmers.se/~appro/linux/DVD+RW/tools ,
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backed by reading mmc5r03c.pdf from http://www.t10.org/ftp/t10/drafts/mmc5/
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@ -683,14 +686,55 @@ For libburnia.pykix.org by Thomas Schmitt <scdbackup@gmx.net>
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Media type can be recognized by Current Profile from 46h GET CONFIGURATION.
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(mmc5r03c.pdf 6.6.2.1)
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DVD-R 0011h
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DVD-RW Restricted Overwrite 0013h
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DVD-RW Sequential Recording 0014h
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There are two approaches for writing to sequential DVD-R[W]: DAO and
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Incremental. Not all media and drives offer Incremental which allows multi-
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session as with CD media.
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- About overwriteavble, blank, appendable and finalized DVD-R[W] media
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- Incremental writing
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>>> - DAO writing (missing yet)
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- Obtaining DVD-R[W] multi-session info for extending ISO-9660 filesystems
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- Obtaining a Table Of Content from DVD-R[W]
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-------------------------------------------------------------------------------
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About overwriteable, blank, appendable and finalized DVD-R[W] media :
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DVD-RW can be either in formatted state Restricted Overwrite or in unformatted
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state Sequential Recording. Sequential media can be either blank, appendable
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or finalized.
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Only blank and appendable media are sequentially writeable. For overwriteable
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DVD-RW see the Overwriteable DVD Cookbook.
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Overwriteable DVD-RW can be detected by their profile number 0013h in contrast
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to profile number 0014h for sequential DVD-RW.
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The status of sequential media can be inquired like with CD by 51h READ DISC
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INFORMATION requesting Data Type 000b Standard Disc Information, where reply
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value Disc Status indicates:
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00b blank
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01b appendable
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10b finalized
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11b others (unsuitable for this recipe)
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(mmc5r03c.pdf 6.22.3.1.4)
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Finalized, appendable or overwriteable DVD-RW can be brought into blank
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sequential state by command A1h BLANK with blanking type 000b "Blank the disc".
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See TAO Multi-Session CD Cookbook for details about blanking.
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Different from CD it seems unwise to use minimal blanking (type 001b) because
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my two DVD drives do not offer the Incremental Streaming feature 0021h with
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DVD-RW which have been treated this way. cdrecord and cdrskin even stall when
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examining these media (exact command and cause is still to be determined).
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(mmc5r03c.pdf 6.2)
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-------------------------------------------------------------------------------
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Incremental writing :
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There are two approaches for writing to sequential DVD-RW. DAO and Incremental.
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Incremental writing allows to produce multi-session DVDs. It is indicated
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by feature 0021h being marked current in the reply of 46h GET CONFIGURATION.
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growisofs inquires 0021h by setting Starting Feature Number to 0x21 and
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@ -701,7 +745,10 @@ Bit. libburn obtains the full feature list for this and other info.
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6.2 46h GET CONFIGURATION, )
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In mode page 05h this method is selected by Write Type 00h.
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>>> speed setting
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Speed can be influenced by B6h SET STREAMING , speed capabilities can be
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inquired by ACh GET PERFORMANCE. It is advised to set only speeds and sizes
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which are returned by ACh.
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(mmc5r03c.pdf 6.39 SET STREAMING, 6.8 GET PERFORMANCE)
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growisofs fetches a mode page 05h template by MODE SENSE and inserts its own
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parameters. It sets Multi-session to 11b, unless dvd_compat is nonzero.
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@ -742,7 +789,8 @@ growisofs takes Packet Size from 52h. Specs predict it will be 16 (= 32 kB).
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The writing process is much like in "Writing a session to CD in TAO mode" :
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Next Writeable Address is fetched from the reply of 52h READ TRACK INFORMATION.
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Currently full 32 kB buffers get written via 2Ah WRITE.
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libburn writes full 32 kB buffers via 2Ah WRITE.
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(mmc5r03c.pdf, 6.27 READ TRACK INFORMATION, 6.44 WRITE)
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When writing is done, it is mandatory to force the drive's buffer to media by
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35h SYNCHRONIZE CACHE.
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(mmc5r03c.pdf, 6.41)
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@ -761,5 +809,113 @@ page 05h wether the disc is finalized or stays appendable.
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It has not been tested yet wether multiple tracks are permissible in a single
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session.
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-------------------------------------------------------------------------------
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>>> DAO writing : INCOMPLETE AND YET UNEXPLORED
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>>> DAO
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DAO is the mode prescribed by feature 002Fh.
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growisofs is_dao in page 05h sets Write Type to 2 "SAO". It is accompanied
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by dvd_compat. Thus Multi-session is set to 0.
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Write Type Packet/TAO/SAO/RAW 02h = DAO (same code as SAO)
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>>> only with DAO and leadout : minus_r_reserve_track
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-------------------------------------------------------------------------------
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Obtaining DVD-R[W] multi-session info for extending ISO-9660 filesystems :
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Like with CD it is necessary to obtain the two numbers for mkisofs option -C
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in order to prepare a ISO-9660 filesystem image which by its inner pointers
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matches the block addresses of the future location on media.
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These are the start address of the first track in the last complete session
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and the predicted start address of the track which will host the new image.
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See TAO Multi-Session CD Cookbook for some more info about mkisofs aspects.
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The first number may be gained by 43h READ TOC/PMA/ATIP Format 0001b which in
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table 478 promises quick access via Start Address Of First Track In Last
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Session.
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(mmc5r03c.pdf 6.26.2.5 table 478, 6.26.3.3.1)
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Regrettably the MMC-5 specs still define a useless reply for non-CD media
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which obviously stems from MMC-3 times when no multi-session was possible
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with non-CD.
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(mmc5r03c.pdf 6.26.3.3.3)
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Both my drives do give a useful reply with the correct number for appendable
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DVD-RW. But not being backed by the specs this method appears unappealing .
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Another approach would be a formatted Table of Content, obtained by 43h READ
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TOC/PMA/ATIP Format 0000b. The specs do not totally outrule that this returns
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useful data with non-CD but they define a crippled TOC for multi-session.
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(mmc5r03c.pdf 6.26.3.2.4)
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My LG drive returns a more detailed TOC, my NEC drive stays with the rather
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suboptimal specs. So one would get different TOCs on different drives.
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Nevertheless, the MMC-5 compliant TOC would return the desired number in
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the Track Start address of the track with the highest number before AAh.
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Most stable seems the approach to obtain the desired number from the reply
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of 52h READ TRACK INFORMATION, Address/Number Type 01b. The field Logical Block
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Address/Track/Session has to bear the track number of the first track in the
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last complete session. To determine this number one has to determine the
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number of the last session and the number of the last track from 51h READ DISC
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INFORMATION and to iterate over the tracknumber by 52h READ TRACK INFORMATION
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until the first track with the desired session number appears and reveils
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its start address.
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(mmc5r03c.pdf 6.22 51h DISC, 6.27 52h TRACK)
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This method is very near to fabricating an own TOC. So libburn does this
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when inspecting the media. If the first number for -C is needed, libburn
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inquires its TOC model for the address of the first track in the last
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complete session. See below for a detailed description of TOC fabrication.
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The second -C number is the exact prediction of future track start address. It
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is gained like with CD by 52h READ TRACK INFORMATION Type 01b. Different from
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CD one may not use track number FFh but has to use the Last Track in Last
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Session from 51h READ DISC INFORMATION.
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(mmc5r03c.pdf 6.22 51h DISC, 6.27 52h TRACK)
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-------------------------------------------------------------------------------
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Obtaining a Table Of Content from DVD-R[W] :
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The raw TOC entries from 43h READ TOC/PMA/ATIP Format 0010b as described with
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CD media are not available with non-CD.
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There is a Format 0000b "Formatted TOC" but this is with non-CD a fictional
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information much at the discretion of the drive. Two drives with the same disc
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may well return different Formatted TOC. They are supposed to be consistent
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only about the last complete session and even there the MMC-5 specification
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6.26.3.2.5 seems to prescribe a structure which does not match the true
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structure of incremental writing to sequential DVD-R[W].
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(mmc5r03c.pdf 6.26.3.2)
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So i prefer not to use this method of getting a TOC.
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The alternative is to produce an own TOC from information gained by 51h READ
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DISC INFORMATION and by 52h READ TRACK INFORMATION which reveil a CD-like
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structure of sessions and 1:n related tracks.
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51h READ DISC INFORMATION Data Type 000b, fields Number of Sessions (Least
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Significant Byte) and Number of Sessions (Most Significant Byte) give the
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number of sessions. The last complete session number of an appendable disc
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is one less because there is an incomplete session at its end. libburn only
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records complete sessions in its TOC model.
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libburn uses Last Track in Last Session as a hint for the range of track
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numbers.
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(mmc5r03c.pdf 6.22)
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Next step ist to iterate from 1 up to the last track number and to obtain
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the according track info by 52h READ TRACK INFORMATION. Each track tells its
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Session Number (LSB at byte 2, MSB at 33), its Logical Track Start Address,
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its Logical Track Size, and much more which is not needed for a fake CD TOC.
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One may analyze the track info more finely but for this special purpose
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it is enough to discard the tracks which do not belong to complete sessions.
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(mmc5r03c.pdf 6.27)
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At the end of each session libburn inserts fake leadout entries into its TOC
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model. Their start address is computed from the start and size of the last
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track of the session.
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-------------------------------------------------------------------------------
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