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[ALSA] rtctimer: add option to make RTC timer the default sequencer timer 

ALSA Core,ALSA sequencer
Add an option to make the RTC timer the default sequencer timer.  This
becomes necessary for precise MIDI timing when the system timer runs at
less than 1000 Hz.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
This commit is contained in:
Clemens Ladisch 2005-09-06 08:00:19 +02:00 committed by Jaroslav Kysela
parent 43bcd973d6
commit a4f508b27c
2 changed files with 19 additions and 1 deletions
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12
sound/core/Kconfig
View File

@ -99,6 +99,18 @@ config SND_RTCTIMER
To compile this driver as a module, choose M here: the module
will be called snd-rtctimer.
config SND_SEQ_RTCTIMER_DEFAULT
bool "Use RTC as default sequencer timer"
depends on SND_RTCTIMER && SND_SEQUENCER
default y
help
Say Y here to use the RTC timer as the default sequencer
timer. This is strongly recommended because it ensures
precise MIDI timing even when the system timer runs at less
than 1000 Hz.
If in doubt, say Y.
config SND_VERBOSE_PRINTK
bool "Verbose printk"
depends on SND

8
sound/core/seq/seq.c
View File

@ -43,7 +43,13 @@ int seq_client_load[64] = {[0 ... 63] = -1};
int seq_default_timer_class = SNDRV_TIMER_CLASS_GLOBAL;
int seq_default_timer_sclass = SNDRV_TIMER_SCLASS_NONE;
int seq_default_timer_card = -1;
int seq_default_timer_device = SNDRV_TIMER_GLOBAL_SYSTEM;
int seq_default_timer_device =
#ifdef CONFIG_SND_SEQ_RTCTIMER_DEFAULT
SNDRV_TIMER_GLOBAL_RTC
#else
SNDRV_TIMER_GLOBAL_SYSTEM
#endif
;
int seq_default_timer_subdevice = 0;
int seq_default_timer_resolution = 0; /* Hz */