ALSA: pcm: fix the fix of the runtime->boundary calculation

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commit ead4046b2f upstream.

Commit 7910b4a1db in 2.6.34 changed the
runtime->boundary calculation to make this value a multiple of both the
buffer_size and the period_size, because the latter is assumed by the
runtime->hw_ptr_interrupt calculation.

However, due to the lack of a ioctl that could read the software
parameters before they are set, the kernel requires that alsa-lib
calculates the boundary value, too.  The changed algorithm leads to
a different boundary value used by alsa-lib, which makes, e.g., mplayer
fail to play a 44.1 kHz file because the silence_size parameter is now
invalid; bug report:
<https://bugtrack.alsa-project.org/alsa-bug/view.php?id=5015>.

This patch reverts the change to the boundary calculation, and instead
fixes the hw_ptr_interrupt calculation to be period-aligned regardless
of the boundary value.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

...

This commit is contained in:

Clemens Ladisch 2010-05-21 09:15:59 +02:00 • committed by Greg Kroah-Hartman

parent 945fb1b153

commit 8882ac1b4e

2 changed files with 10 additions and 38 deletions

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9

sound/core/pcm_lib.c

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39

sound/core/pcm_native.c

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