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The Advanced Linux Sound Architecture (ALSA) - library
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Takashi Iwai b3ce9cb839 pcm: direct: Improved suspend/resume support 
The current resume handling in PCM direct plugins don't treat multiple
clients properly: once after the slave PCM gets resumed by one
client, the access from others at a later point is seen as already
running although the internal state isn't updated and becomes
inconsistent.  This may end up a negative size, which eventually hangs
up.

This patch is an attempt to improve the handling for resume.  Now the
suspended state is treated similarly like XRUN; namely, we keep the
slave PCM "recoveries" count that is modified at each time the slave
PCM XRUN happens, so that we can check the inconsistency against the
client's state.  As a differentiation to XRUN, we set the highest bit
of recoveries count when the slave stream hits SUSPENDED state.  This
bit is referred at comparing with clients, and the client's state is
updated to either XRUN or SUSPENDED depending on this bit.

Along with this change, the actual resume is done in
snd_pcm_direct_slave_recover(), and snd_pcm_direct_resume() rather
calls this internally.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2022-03-10 12:58:51 +01:00
.github/workflows github actions: ubuntu - fix the non-interactive build 2020-06-02 13:16:55 +02:00
alsalisp Change FSF address (Franklin Street) 2017-11-14 14:29:26 +01:00
aserver Use __func__ instead of __FUNCTION__ 2019-06-12 08:52:07 +02:00
doc ucm: add initial doxygen documenation 2021-12-01 10:33:44 +01:00
include conf: fix the export of safe_strto* functions from libasound 2022-01-01 19:26:48 +01:00
m4 Update the attributes.m4 macro file from xine 2020-01-03 19:13:13 +01:00
modules snd_dlopen: implement the relocatable version for glibc 2020-06-04 19:09:58 +02:00
src pcm: direct: Improved suspend/resume support 2022-03-10 12:58:51 +01:00
test conf: introduce snd_config_load_string() 2021-12-01 10:18:58 +01:00
utils utils/alsa.m4: another quick fix for the brackets 2021-04-14 08:08:43 +02:00
.gitignore initial version of .travis.yml file 2018-10-24 16:07:58 +02:00
.travis.yml initial version of .travis.yml file 2018-10-24 16:07:58 +02:00
acinclude.m4 fixed for the recent autoconf. 2004-01-26 15:52:17 +00:00
ChangeLog * update to libtool 1.3.3 1999-07-22 12:18:42 +00:00
configure.ac Release v1.2.6.1 2021-12-09 14:17:59 +01:00
COPYING Change FSF address (Franklin Street) 2017-11-14 14:29:26 +01:00
gitcompile add support for GCC's LTO 2019-04-09 12:44:14 +02:00
INSTALL pcm: Add thread-safety to PCM API 2016-07-11 15:25:30 +02:00
Makefile.am Makefile: Add README.md to EXTRA_DIST 2020-12-10 10:37:13 +01:00
MEMORY-LEAK Initial version 2003-02-04 14:56:07 +00:00
NOTES Change assert condition in error message handler 2007-10-24 12:53:08 +02:00
README.md README: add patch submission instructions 2020-08-16 09:36:01 +02:00
TODO Added snd_config_load_override(). 2002-01-09 21:28:15 +00:00

README.md

alsa-lib

Advanced Linux Sound Architecture (ALSA) project

Build alsa-lib

The alsa-lib is a library to interface with ALSA in the Linux kernel and virtual devices using a plugin system.

The up-to-date reference generated from sources can be accessed here:

http://www.alsa-project.org/alsa-doc/alsa-lib/

You may give a look for more information about the ALSA project to URL http://www.alsa-project.org.

Submitting patches

The preferred way to submit patches is by sending them by email to the alsa-devel mailing list. Sending mail to the list requires subscription, subscribe here: https://mailman.alsa-project.org/mailman/listinfo/alsa-devel

Add Takashi Iwai <tiwai@suse.de> and/or Jaroslav Kysela <perex@perex.cz> to Cc so that your patch won't be missed.

Patches are also accepted as GitHub pull requests.