On 08/20/2011 06:12 PM, Tanu Kaskinen wrote:
On Fri, 2011-08-19 at 14:08 +0530, Himanshu Chug wrote:
Hi All
I am able to get the small beep files working consistently using gst-launch
now by modifying tsched_buffer_size param of module-alsa-sink like:
load-module module-alsa-sink tsched_buffer_size=1024,
(buffer size is default to 2s)
I am using timer based tsched audio scheduling , on OMAP4 platform.
I have few questions:
Q1. how does this change affect my system, if I always make
tsched_buffer_size=1024? I suspect it may increase the power
consumption and increase the ALSA
wakeup's , if I reduce the buffer size and period like like this?
Yes.
Q2. When the beep file is not played on speakers , I can see a lot of rewind
prints from PA
protocol-native.c: Requesting rewind due to rewrite. and it continues and
finally I got EOS from my gst pipeline
I need to know what is rewind ? and what triggers PA to make these rewinds?
As the log message says, the rewrites cause the rewinds.
and what is "rewrite" here in terms of pulseaudio?
It means rewriting part of the sink (hw) buffer. If that log message
appears, it means that the client has written data to a position that
requires a part of the sink's buffer to be overwritten, and thus a
rewind is needed.
(Just to remind you I can play the beep wav with paplay and pacmd
play-file, without any issues and without modifying the buffersize param.
so I am just confused whats going here ? )
So did you find out whether your system has David's patches that I
referred to in my previous reply? If you did, and the patches are
applied, then there's still something to fix in Pulseaudio's and
Gstreamer's interaction.
Btw, I posted an improved version of the patch a few days ago to the
gstreamer mailinglist, and it has been committed. See
http://cgit.freedesktop.org/gstreamer/gst-plugins-good/commit/ext/pulse/pulsesink.c?id=e70020b45630d99132a99892ecc6e1dcd1ce6f8a
Hopefully that can help.
--
David Henningsson, Canonical Ltd.
http://launchpad.net/~diwic
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