[pulseaudio-tickets] [Bug 40125] New: Using the ALSA plug-in client, the end of short sounds are cut-off.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=40125

           Summary: Using the ALSA plug-in client, the end of short sounds
                    are cut-off.
           Product: PulseAudio
           Version: unspecified
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: alsa
        AssignedTo: pulseaudio-bugs at lists.freedesktop.org
        ReportedBy: james at nurealm.net
         QAContact: pulseaudio-bugs at lists.freedesktop.org
                CC: lennart at poettering.net


pulseaudio 0.9.23 on
Debian Wheezy/testing and
KDE4.6

Running klettres
 $ klettres --version
 Qt: 4.7.3
 KDE Development Platform: 4.6.5 (4.6.5)
 KLettres: 2.3

and configuring alsa with /etc/asound.conf as described at
 http://www.pulseaudio.org/wiki/PerfectSetup

The program klettres "speaks" the letters from different alphabets as short
sounds.

If played through artsd, with a very short 8ms sound buffer and no
auto-suspend, sounds are complete, as would be expected.  A longer sound
buffer, or any recovery from auto-suspend, severely delays the start of a
sound.

If played through pulseaudio with no alsa plugin, and with or without the
pulseaudio server "connected", the end of the sounds are cut-off, and there is
a "long" - over a second - and variable delay to the sound starting, especially
if a sound is repeated before or during a previously triggered sound.

If played through artsd and esdcompat, there is no sound output at all.

If played through the alsa plugin, as configured above, the sound starts
promptly, but the ends of the sound are cut-off.  The length of time cut-off
seems to be relative to the _end_ of the sound, in the sense that a longer
length of a sound is heard with a longer sound, but the end is still lost.  The
length cut-off seems to be of some fixed length, around half a second to a
second.  The cut-off is abrupt and ends with a soft "click/tick" noise.  The
overall effect, of course, makes klettres practically unusable with pulseaudio.

Changing default-fragment-size-msec in /etc/pulse/daemon.conf makes no
difference.

I am presuming that playing alsa through pulseaudio using the asound.conf
configuration is the preferred pulseaudio set-up, so that approach should be
made to "just work".


James

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