[alsa-devel] [patch] dmix skipping first set of samples
Mike Gorse
mgorse at mgorse.dhs.org
Sun Mar 9 23:20:47 CET 2008
There was a change in alsa-lib 1.0.16 which looks like it was designed to
make dmix skip samples in the case of underruns, but it causes the first
sample to be skipped since dmix->slave_hw_ptr == dmix->slave_appl_ptr.
The following patch fixes this and fixes a small typo in the comment:
--- src/pcm/pcm_dmix.c.orig 2008-01-18 20:00:10.000000000 -0500
+++ src/pcm/pcm_dmix.c 2008-03-09 18:01:13.000000000 -0400
@@ -311,9 +311,9 @@
if (size >= pcm->boundary / 2)
size = pcm->boundary - size;
- /* the slave_app_ptr can be far behing the slave_hw_ptr */
+ /* the slave_app_ptr can be far behind the slave_hw_ptr */
/* reduce mixing and errors here - just skip not catched writes */
- if (dmix->slave_hw_ptr < dmix->slave_appl_ptr)
+ if (dmix->slave_hw_ptr <= dmix->slave_appl_ptr)
slave_size = dmix->slave_appl_ptr - dmix->slave_hw_ptr;
else
slave_size = dmix->slave_appl_ptr + (dmix->slave_boundary - dmix->slave_hw_ptr);
Thanks,
-- Mike Gorse / AIM:linvortex / http://mgorse.freeshell.org --
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