1
# ALSA soundcard-configuration
16
# To be effective this also requires INPUT - users should say:
17
# select SND_JACK if INPUT=y || INPUT=SND
18
# to avoid having to force INPUT on.
23
tristate "Sequencer support"
26
Say Y or M to enable MIDI sequencer and router support. This
27
feature allows routing and enqueueing of MIDI events. Events
28
can be processed at a given time.
30
Many programs require this feature, so you should enable it
31
unless you know what you're doing.
34
tristate "Sequencer dummy client"
35
depends on SND_SEQUENCER
37
Say Y here to enable the dummy sequencer client. This client
38
is a simple MIDI-through client: all normal input events are
39
redirected to the output port immediately.
41
You don't need this unless you want to connect many MIDI
42
devices or applications together.
44
To compile this driver as a module, choose M here: the module
45
will be called snd-seq-dummy.
52
tristate "OSS Mixer API"
55
To enable OSS mixer API emulation (/dev/mixer*), say Y here
56
and read <file:Documentation/sound/alsa/OSS-Emulation.txt>.
58
Many programs still use the OSS API, so say Y.
60
To compile this driver as a module, choose M here: the module
61
will be called snd-mixer-oss.
64
tristate "OSS PCM (digital audio) API"
68
To enable OSS digital audio (PCM) emulation (/dev/dsp*), say Y
69
here and read <file:Documentation/sound/alsa/OSS-Emulation.txt>.
71
Many programs still use the OSS API, so say Y.
73
To compile this driver as a module, choose M here: the module
74
will be called snd-pcm-oss.
76
config SND_PCM_OSS_PLUGINS
77
bool "OSS PCM (digital audio) API - Include plugin system"
78
depends on SND_PCM_OSS
81
If you disable this option, the ALSA's OSS PCM API will not
82
support conversion of channels, formats and rates. It will
83
behave like most of new OSS/Free drivers in 2.4/2.6 kernels.
85
config SND_SEQUENCER_OSS
86
bool "OSS Sequencer API"
87
depends on SND_SEQUENCER
90
Say Y here to enable OSS sequencer emulation (both
91
/dev/sequencer and /dev/music interfaces).
93
Many programs still use the OSS API, so say Y.
95
If you choose M in "Sequencer support" (SND_SEQUENCER),
96
this will be compiled as a module. The module will be called
100
tristate "HR-timer backend support"
101
depends on HIGH_RES_TIMERS
104
Say Y here to enable HR-timer backend for ALSA timer. ALSA uses
105
the hrtimer as a precise timing source. The ALSA sequencer code
106
also can use this timing source.
108
To compile this driver as a module, choose M here: the module
109
will be called snd-hrtimer.
111
config SND_SEQ_HRTIMER_DEFAULT
112
bool "Use HR-timer as default sequencer timer"
113
depends on SND_HRTIMER && SND_SEQUENCER
116
Say Y here to use the HR-timer backend as the default sequencer
120
tristate "RTC Timer support"
124
Say Y here to enable RTC timer support for ALSA. ALSA uses
125
the RTC timer as a precise timing source and maps the RTC
126
timer to ALSA's timer interface. The ALSA sequencer code also
127
can use this timing source.
129
To compile this driver as a module, choose M here: the module
130
will be called snd-rtctimer.
132
Note that this option is exclusive with the new RTC drivers
133
(CONFIG_RTC_CLASS) since this requires the old API.
135
config SND_SEQ_RTCTIMER_DEFAULT
136
bool "Use RTC as default sequencer timer"
137
depends on SND_RTCTIMER && SND_SEQUENCER
138
depends on !SND_SEQ_HRTIMER_DEFAULT
141
Say Y here to use the RTC timer as the default sequencer
142
timer. This is strongly recommended because it ensures
143
precise MIDI timing even when the system timer runs at less
148
config SND_DYNAMIC_MINORS
149
bool "Dynamic device file minor numbers"
151
If you say Y here, the minor numbers of ALSA device files in
152
/dev/snd/ are allocated dynamically. This allows you to have
153
more than 8 sound cards, but requires a dynamic device file
156
If you are unsure about this, say N here.
158
config SND_SUPPORT_OLD_API
159
bool "Support old ALSA API"
162
Say Y here to support the obsolete ALSA PCM API (ver.0.9.0 rc3
165
config SND_VERBOSE_PROCFS
166
bool "Verbose procfs contents"
170
Say Y here to include code for verbose procfs contents (provides
171
useful information to developers when a problem occurs). On the
172
other side, it makes the ALSA subsystem larger.
174
config SND_VERBOSE_PRINTK
175
bool "Verbose printk"
177
Say Y here to enable verbose log messages. These messages
178
will help to identify source file and position containing
181
You don't need this unless you're debugging ALSA.
186
Say Y here to enable ALSA debug code.
188
config SND_DEBUG_VERBOSE
189
bool "More verbose debug"
192
Say Y here to enable extra-verbose debugging messages.
194
Let me repeat: it enables EXTRA-VERBOSE DEBUGGING messages.
195
So, say Y only if you are ready to be annoyed.
197
config SND_PCM_XRUN_DEBUG
198
bool "Enable PCM ring buffer overrun/underrun debugging"
200
depends on SND_DEBUG && SND_VERBOSE_PROCFS
202
Say Y to enable the PCM ring buffer overrun/underrun debugging.
203
It is usually not required, but if you have trouble with
204
sound clicking when system is loaded, it may help to determine
205
the process or driver which causes the scheduling gaps.
214
source "sound/core/seq/Kconfig"