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The Advanced Linux Sound Architecture (ALSA) - library
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Takashi Sakamoto ce0905c3ca pcm: hw: add a helper function to query status/control data 
When executing ioctl(2) with some commands, applications can request
ALSA PCM core to change appl_ptr in kernel space. Below is a list of
such operations:
 - SNDRV_PCM_IOCTL_PREPARE
 - SNDRV_PCM_IOCTL_RESET
 - SNDRV_PCM_IOCTL_REWIND
 - SNDRV_PCM_IOCTL_FORWARD
 - SNDRV_PCM_IOCTL_WRITEI_FRAMES
 - SNDRV_PCM_IOCTL_WRITEN_FRAMES
 - SNDRV_PCM_IOCTL_READI_FRAMES
 - SNDRV_PCM_IOCTL_READN_FRAMES

After these operations, the value of appl_ptr should be synchronized
between kernel/user spaces.

This commit adds a helper function to query status and control data
without issuing the control data just in fallback from failure of control
mapping.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2017-06-30 16:37:21 +02:00
alsalisp autotools: update style 2014-02-26 08:16:22 +01:00
aserver coverity fixes 2016-01-12 16:26:58 +01:00
doc doxygen: Suppress timestamp 2016-06-23 16:29:07 +02:00
include topology: Add support for new widget types 2017-06-30 16:32:53 +02:00
m4 Add the attributes.m4 macro file from xine/lscube. 2008-11-21 13:04:19 +01:00
modules mixer: Don't install smixer modules unless python is enabled 2016-11-14 11:46:05 +01:00
src pcm: hw: add a helper function to query status/control data 2017-06-30 16:37:21 +02:00
test test: add a test for list operation to user-defined element sets 2017-05-25 18:45:41 +02:00
utils autotools: update style 2014-02-26 08:16:22 +01:00
.gitignore Add pcm-multi-thread to .gitignore 2016-07-07 16:30:54 +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 v1.1.4.1 2017-06-01 08:27:36 +02:00
COPYING Updated GNU GPL license (address). 2001-12-30 09:22:54 +00:00
gitcompile Introduce --with-pkgconfdir, add 64-bit defaults to gitcompile 2012-01-20 16:14:44 +01:00
INSTALL pcm: Add thread-safety to PCM API 2016-07-11 15:25:30 +02:00
Makefile.am autotools: update style 2014-02-26 08:16:22 +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
TODO Added snd_config_load_override(). 2002-01-09 21:28:15 +00:00