Rockbox

  • Status Closed
  • Percent Complete
    100%
  • Task Type Bugs
  • Category Music playback
  • Assigned To No-one
  • Operating System All players
  • Severity Low
  • Priority Defer
  • Reported Version
  • Due in Version Undecided
  • Due Date Undecided
  • Votes
  • Private
Attached to Project: Rockbox
Opened by kobler - 2006-01-08
Last edited by bagder - 2006-04-28

FS#2894 - cache refill on FF or REW, even if not necessary

Recorder V1 with 2 or 8MB, V2.5 and later(incl. 20060108)

When more than one file is in the cache (e.g. filesize
of playing file is less than about 1,5/7,5MB) and
skipping back or forth a few seconds, after releasing
the button, data gets loaded from disk (red LED is
blinking for several seconds) even when the needed data
is still - or is already - in the cache.

This doesn't happen with V2.4.

Becaues the chance of more than one file beeing in the
cache is much less on a 2MB RAM Recorder, it hasn't
been noticed already, I guess. But with the new devices
with bigger RAM sizes it will hurt more.

I had a look at mpeg.c, but all I could find out, is,
that the disk already spins up, when

case MPEG_NEED_DATA:

is *NOT YET REACHED*. And a little later
(!filling && diffpos >= 0 && diffpos < audiobuflen)
is false and also reloads cache.
But than I got lost in ffwd_rew() and audio_ff_rewind()..

Closed by  bagder
2006-06-28 13:47
Reason for closing:  Wont Fix
Additional comments about closing:  

This report is somewhat speculative and doesn\'t actually point out any error, just discussiong theories about what Rockbox perhaps could do better in a situation the reporter thinks he experienced.

Project Manager

I don't think this issue is of priority "urgent" and I don't think we MUST fix this for 3.0

Are you sure the data is already in RAM? If you seek back a few seconds, it is possible (if somewhat unlikely) that the data has already been dropped from the buffer. In the same vein, if you seek forward a few seconds, that could trigger a rebuffer event which will drop old data from the buffer and buffer forward in the playlist / file.

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