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--- extendinglibhimd [2012/01/29 22:36] – glaubitz
+++ extendinglibhimd [2012/02/28 20:42] (current) – [Integrate SCSI command code] glaubitz
@@ Line 21: / Line 21: @@
 Sending SCSI commands has not been implemented into //libhimd// yet. However, there is a fully working example code in the git repository in the subfolder //basictools// which implements the supported SCSI command set through //libscg//, the Linux SCSI layer and the SCSI abstraction layer which is part of the //dvd+rw-tools// (see: [[https://wiki.physik.fu-berlin.de/linux-minidisc/doku.php?id=scsisupport]]). The latter will be the **preferred implementation** as it works out of the box on the most important operating systems and does not require any additional dependencies.
+===== Proposed project plan =====
+Stemming from the aforementioned current state of //libhimd//, the following tasks arise as the next steps in development:
+  * finalize and polish MP3 write support
+  * add write support for PCM/ATRAC3/ATRAC3+ files (MZ-RH1 with //constant// key only)
+  * implement and fix existing for functions for renaming and deleting tracks
+  * integrate SCSI code proposed in [[https://lists.fu-berlin.de/pipermail/linux-minidisc/2010-December/msg00000.html]] into //libhimd//, (see [[http://users.physik.fu-berlin.de/~glaubitz/linux-minidisc/himdscsitest_dvd-tools.c]] for example source code using //transport.hxx//)
+===== Detailed description of the tasks =====
+Finally, the four proposed project tasks are to be explained in more detail here.
+==== Finalizing MP3 write support ====
+As mentioned before, write support for MP3s has largely been implemented already. However, the code is still buggy and also supports MP3s with //128kHz/44kbps// only. The task is therefore to properly parse MP3 input files with //libmad// and then set the parameters in the tracklist file accordingly for each MP3 frame so that the Walkman is able to decode and play back the MP3 files. The code should also check whether the input files are in a valid MP3 format which the Walkman can work with.
+==== Adding prelimenary support for writing PCM/ATRAC3/ATRAC3+ ====
+While MP3 audio data is encrypted with a relatively simple XOR compression and neither uses any MAC authentication, implementation is rather simple, writing PCM/ATRAC3/ATRAC3+ is rather difficult. The encryption employed is 3DES.
+==== Fix renaming and deleting tracks ====
+See [[https://wiki.physik.fu-berlin.de/linux-minidisc/doku.php?id=himddiskformat#the_track-index_file]].
+==== Integrate SCSI command code ====
+The background of this task is that HiMD devices interpret SCSI commands through USB in order to perform tasks like formatting a medium, erasing all contents and certain DRM commands (see: [[https://wiki.physik.fu-berlin.de/linux-minidisc/doku.php?id=scsidrminfo]]).
+The fundamental part of this task is integrating the SCSI code using transport.hxx from the //dvd+rw-tools// into libhimd (see: [[http://users.physik.fu-berlin.de/~glaubitz/linux-minidisc/himdscsitest_dvd-tools.c]]) and providing a nice API which can be used from the application land to issue the various SCSI commands. A generic function to do SCSI I/O is enough, applications can send the specific SCSI commands themselves. It might useful to implement another abstraction layer providing the basic functions for //format//, //erase all// etc, however.