Added snapshot of emerging sequential DVD-R[W] cookbook
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@ -669,5 +669,97 @@ 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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(mmc5r03c.pdf 6.3.3.2.3)
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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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and by experiments with drives NEC ND-4570A and LG GSA-4082B.
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For libburnia.pykix.org by Thomas Schmitt <scdbackup@gmx.net>
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-------------------------------------------------------------------------------
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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-RW Restricted Overwrite 0013h
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DVD-RW Sequential Recording 0014h
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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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Allocation Length to 16 in order to get only this one. The feature descriptor
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begins at byte 8 of the reply. Its availability is indicated by the Current
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Bit. libburn obtains the full feature list for this and other info.
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(mmc5r03c.pdf 5.2.2. Feature Descriptor format, 5.3.11 Feature 0021h,
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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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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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libburn composes its mode page 05h from zero and allows control of
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Multi-Session by the application.
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BUFE Buffer Underrun protection 0=off, 1=on
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LS_V Link size valid 1=true
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Test Write -dummy mode for writing 0=off, 1=on
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Write Type Packet/TAO/SAO/RAW 00h = Incremental (Packet)
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Multi-session Wether to keep appendable 00b = finalize(growisofs DAO)
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11b = keep appendable
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Track Mode Describes frame type 5 [*1]
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Data Block Type Layout of payload blocks 8 [*2]
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Link Size ??? 16 [*3]
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FP Fixed Packet Size Bit 1
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Packet Size 16 [*4]
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(mmc5r03c.pdf 7.5.4 The Mode Page, 4.2.3.4 Table 17 CONTROL = Track Mode)
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(spc3r23.pdf 6.8 MODE SELECT, 7.4.3 Mode parameter header formats)
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[*1:]
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growisofs takes the Track Mode from 52h READ TRACK INFORMATION, Address/Number
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Type 1, Track 1, Track Information Block byte 5 & 0xf.
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(mmc5r03.pdf 6.27)
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The specs predict that this will be Track Mode 4 (6.27.3.8) and also state that
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default is 5 (7.5.4.12). 4 means: uninterrupted, do not copy. 5 means
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increment, do not copy.
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[*2:]
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8 means: 2048 byte data blocks. growisofs sets this value if Data Mode from
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above 52h READ TRACK INFORMATION is 1 or Fh, which is predicted by the specs
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to be always true.
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(mmc5r03.pdf 6.27.3.10)
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[*3:]
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growisofs (transport.hxx) sets Link Size to 16 for profiles 0011h and 0014h.
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libburn now records the first link size from feature 0021h in its burn_drive
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structure. If another link size item is 16, then 16 is used.
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[*4:]
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growisofs takes Packet Size from 52h. Specs predict it will be 16 (= 32 kB).
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(mmc5r03.pdf 7.5.4.16)
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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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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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The track has to be closed by 5Bh CLOSE TRACK SESSION Close Function 001b.
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growisofs uses the logical track number for that and not FFh like libburn
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does with TAO CD. So libburn obtains the Last Track Number in Last Session
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from the reply of 51h READ DISC INFORMATION requesting Data Type 000b
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"Standard Disc Information".
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(mmc5r03c.pdf 6.3.3.2.2 CLOSE TRACK, 6.22.3.1.)
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Afterwards 5Bh CLOSE TRACK SESSION Close Function 010b with Logical Track
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Number 0 closes the session. It depends on the Multi-Session value in mode
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page 05h wether the disc is finalized or stays appendable.
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(mmc5r03c.pdf 6.3.3.2.3)
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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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-------------------------------------------------------------------------------
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