1 # ALSA soundcard-configuration
15 config SND_COMPRESS_OFFLOAD
18 # To be effective this also requires INPUT - users should say:
19 # select SND_JACK if INPUT=y || INPUT=SND
20 # to avoid having to force INPUT on.
25 tristate "Sequencer support"
28 Say Y or M to enable MIDI sequencer and router support. This
29 feature allows routing and enqueueing of MIDI events. Events
30 can be processed at a given time.
32 Many programs require this feature, so you should enable it
33 unless you know what you're doing.
36 tristate "Sequencer dummy client"
37 depends on SND_SEQUENCER
39 Say Y here to enable the dummy sequencer client. This client
40 is a simple MIDI-through client: all normal input events are
41 redirected to the output port immediately.
43 You don't need this unless you want to connect many MIDI
44 devices or applications together.
46 To compile this driver as a module, choose M here: the module
47 will be called snd-seq-dummy.
54 tristate "OSS Mixer API"
57 To enable OSS mixer API emulation (/dev/mixer*), say Y here
58 and read <file:Documentation/sound/alsa/OSS-Emulation.txt>.
60 Many programs still use the OSS API, so say Y.
62 To compile this driver as a module, choose M here: the module
63 will be called snd-mixer-oss.
66 tristate "OSS PCM (digital audio) API"
70 To enable OSS digital audio (PCM) emulation (/dev/dsp*), say Y
71 here and read <file:Documentation/sound/alsa/OSS-Emulation.txt>.
73 Many programs still use the OSS API, so say Y.
75 To compile this driver as a module, choose M here: the module
76 will be called snd-pcm-oss.
78 config SND_PCM_OSS_PLUGINS
79 bool "OSS PCM (digital audio) API - Include plugin system"
80 depends on SND_PCM_OSS
83 If you disable this option, the ALSA's OSS PCM API will not
84 support conversion of channels, formats and rates. It will
85 behave like most of new OSS/Free drivers in 2.4/2.6 kernels.
87 config SND_SEQUENCER_OSS
88 bool "OSS Sequencer API"
89 depends on SND_SEQUENCER
92 Say Y here to enable OSS sequencer emulation (both
93 /dev/sequencer and /dev/music interfaces).
95 Many programs still use the OSS API, so say Y.
97 If you choose M in "Sequencer support" (SND_SEQUENCER),
98 this will be compiled as a module. The module will be called
102 tristate "HR-timer backend support"
103 depends on HIGH_RES_TIMERS
106 Say Y here to enable HR-timer backend for ALSA timer. ALSA uses
107 the hrtimer as a precise timing source. The ALSA sequencer code
108 also can use this timing source.
110 To compile this driver as a module, choose M here: the module
111 will be called snd-hrtimer.
113 config SND_SEQ_HRTIMER_DEFAULT
114 bool "Use HR-timer as default sequencer timer"
115 depends on SND_HRTIMER && SND_SEQUENCER
118 Say Y here to use the HR-timer backend as the default sequencer
122 tristate "RTC Timer support"
126 Say Y here to enable RTC timer support for ALSA. ALSA uses
127 the RTC timer as a precise timing source and maps the RTC
128 timer to ALSA's timer interface. The ALSA sequencer code also
129 can use this timing source.
131 To compile this driver as a module, choose M here: the module
132 will be called snd-rtctimer.
134 Note that this option is exclusive with the new RTC drivers
135 (CONFIG_RTC_CLASS) since this requires the old API.
137 config SND_SEQ_RTCTIMER_DEFAULT
138 bool "Use RTC as default sequencer timer"
139 depends on SND_RTCTIMER && SND_SEQUENCER
140 depends on !SND_SEQ_HRTIMER_DEFAULT
143 Say Y here to use the RTC timer as the default sequencer
144 timer. This is strongly recommended because it ensures
145 precise MIDI timing even when the system timer runs at less
150 config SND_DYNAMIC_MINORS
151 bool "Dynamic device file minor numbers"
153 If you say Y here, the minor numbers of ALSA device files in
154 /dev/snd/ are allocated dynamically. This allows you to have
155 more than 8 sound cards, but requires a dynamic device file
158 If you are unsure about this, say N here.
161 int "Max number of sound cards"
164 depends on SND_DYNAMIC_MINORS
166 Specify the max number of sound cards that can be assigned
169 config SND_SUPPORT_OLD_API
170 bool "Support old ALSA API"
173 Say Y here to support the obsolete ALSA PCM API (ver.0.9.0 rc3
176 config SND_VERBOSE_PROCFS
177 bool "Verbose procfs contents"
181 Say Y here to include code for verbose procfs contents (provides
182 useful information to developers when a problem occurs). On the
183 other side, it makes the ALSA subsystem larger.
185 config SND_VERBOSE_PRINTK
186 bool "Verbose printk"
188 Say Y here to enable verbose log messages. These messages
189 will help to identify source file and position containing
192 You don't need this unless you're debugging ALSA.
197 Say Y here to enable ALSA debug code.
199 config SND_DEBUG_VERBOSE
200 bool "More verbose debug"
203 Say Y here to enable extra-verbose debugging messages.
205 Let me repeat: it enables EXTRA-VERBOSE DEBUGGING messages.
206 So, say Y only if you are ready to be annoyed.
208 config SND_PCM_XRUN_DEBUG
209 bool "Enable PCM ring buffer overrun/underrun debugging"
211 depends on SND_DEBUG && SND_VERBOSE_PROCFS
213 Say Y to enable the PCM ring buffer overrun/underrun debugging.
214 It is usually not required, but if you have trouble with
215 sound clicking when system is loaded, it may help to determine
216 the process or driver which causes the scheduling gaps.
228 source "sound/core/seq/Kconfig"