• Status Closed
  • Percent Complete
  • Task Type Patches
  • Category Codecs
  • Assigned To
  • Operating System All players
  • Severity Low
  • Priority Very Low
  • Reported Version Release 3.4
  • Due in Version Undecided
  • Due Date Undecided
  • Votes
  • Private
Attached to Project: Rockbox
Opened by Buschel - 2010-03-05
Last edited by Buschel - 2010-03-07

FS#11079 - musepack sv8 support

This patch exchanges the current svn musepack decoder against the current official decoder from (r458). With this patch musepack sv8 is supported in addition to svn’s sv7 – including playback and seek. For better performance r458 was merged against rockbox svn to use the already highly optimized filterbanks.

1) Building with this patch will throw several warnings. I am working on this.
2) Tested on pcsim and arm. Results on coldfire are still needed, appreciated and helpful.
3) Decoding is still slower than svn for now (arm svn ~22MHz, arm patched ~27MHz).
4) The metadata check does still use dummy results for sv8 streams.

sv7 and sv8 streams for testing can be found at

Closed by  Buschel
2010-03-07 20:30
Reason for closing:  Accepted
Additional comments about closing:   Warning: Undefined array key "typography" in /home/rockbox/flyspray/plugins/dokuwiki/inc/parserutils.php on line 371 Warning: Undefined array key "camelcase" in /home/rockbox/flyspray/plugins/dokuwiki/inc/parserutils.php on line 407

Committed with r25057.

Next patch version:
- removed tabs
- removed compile warnings (3 warnings were inserted as reminder)
- put some more stuff to iram

Speed on iPod Video is decent now: 22.6 MHz.
Speed on other targets will need some more work as a major data structure could not been moved to iram yet.

Final (?) patch version:
- reformated lots of tables
- moved some more tables to iram
- rearranged decoder's data structure to fit it into iram on most targets
- adapted handling of first frame (cutting first samples) to non-interleaved sample format
- fully implemented metadata for mpc sv8

Important change in sv8 calculation of replay gain.

Works on pcsim, arm (iPod 5G) and coldfire (H140, tested by AlexP on irc).
Still slower as svn for coldfire (svn: ~25 MHz, patch: ~32 MHz).

Rearranged demux data structure to be able to move parts of it to IRAM. This speeds up the decoding on coldfire.

Speed on arm (iPod 5.5G) is 22.5 MHz (svn: 22.2 MHz).
Speed on coldfire (h130) is 29.7 MHz (svn: 25.3 MHz).

Measurements by AlexP on irc showed clearly that the main difference in speed on coldfire is located in the bitstream demuxing only (new decoder is about 4 MHz slower in this area). A major change of the new decoder is that it does uses a byte bitstream buffer instead of dword bitstream buffer.

Theory about Coldfire issues with the demux code was correct. I wrote a wrapping function to optimize the performance on Coldfire (see mpc_bits_reader.h), other targets are untouched.

Speed on Coldfire (h130) is 26.3 MHz now (svn: 25.3 MHz).

Cosmetic changes in comments (do not use 'AB', but 'rockbox').


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