misc/79498: sndfile-play (and many other players) cut playback a little before the end of the sound sample

Jukka Ukkonen jau at iki.fi
Sun Apr 3 01:00:16 PST 2005


>Number:         79498
>Category:       misc
>Synopsis:       sndfile-play (and many other players) cut playback a little before the end of the sound sample
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sun Apr 03 09:00:15 GMT 2005
>Closed-Date:
>Last-Modified:
>Originator:     Jukka Ukkonen
>Release:        4.11-STABLE
>Organization:
>Environment:
FreeBSD mjolnir 4.11-STABLE FreeBSD 4.11-STABLE #3: Tue Mar 29 12:08:01 EEST 2005     root at mjolnir:/usr/obj/home/src/sys/Mjolnir  i386
>Description:
      sndfile-play (among many other sound file players) cuts playback a moment
before the actual end of the playback.
Since the problem is shared between many sound file programs, it is probably
a problem in the implementation of /dev/dsp.

Sometimes when using huge buffer sizes the playback works all the way to the end
of the sample, but as a side effect become also very irritatingly long delays
both before and after the playback.
The symptoms make one suspect that assumptions which work with programs written
originally for the Linux OSS/voxware API do not quite match the bahaviour of
the FreeBSD pcm implementation. There might be different defaults for some
controls or sizes.
Since the FreeBSD pcm API and ioctl()s are practically undocumented, it is very
hard to start tracking the roots of the problem.
Patching ported programs to properly handle different defaults etc. becomes
pointless unless one knows the assumptions made by the environment.

>How-To-Repeat:
      Try e.g. sndfile-play on various .wav and .au files. Very soon one should
start to notice that some files playback gets cut a moment before the actual
end of the sample.
Find one such sample attached below as a b64 encoded .au file. You should hear
only "Thank you for your co-op" or "Thank you for your co-opera" instead of the
full length "Thank you for your co-operation."

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>Fix:
      No fix known.
The pcm programming interface being practically undocumented it would be
pointlessly hard to try to find one.
The pcm API needs to be properly documented first.

>Release-Note:
>Audit-Trail:
>Unformatted:


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