1 # ALSA soundcard-configuration
7 select SND_TIMER if SND_PCM_TIMER
15 config SND_DMAENGINE_PCM
24 config SND_COMPRESS_OFFLOAD
27 # To be effective this also requires INPUT - users should say:
28 # select SND_JACK if INPUT=y || INPUT=SND
29 # to avoid having to force INPUT on.
34 tristate "Sequencer support"
37 Say Y or M to enable MIDI sequencer and router support. This
38 feature allows routing and enqueueing of MIDI events. Events
39 can be processed at a given time.
41 Many programs require this feature, so you should enable it
42 unless you know what you're doing.
45 tristate "Sequencer dummy client"
46 depends on SND_SEQUENCER
48 Say Y here to enable the dummy sequencer client. This client
49 is a simple MIDI-through client: all normal input events are
50 redirected to the output port immediately.
52 You don't need this unless you want to connect many MIDI
53 devices or applications together.
55 To compile this driver as a module, choose M here: the module
56 will be called snd-seq-dummy.
63 tristate "OSS Mixer API"
66 To enable OSS mixer API emulation (/dev/mixer*), say Y here
67 and read <file:Documentation/sound/alsa/OSS-Emulation.txt>.
69 Many programs still use the OSS API, so say Y.
71 To compile this driver as a module, choose M here: the module
72 will be called snd-mixer-oss.
75 tristate "OSS PCM (digital audio) API"
79 To enable OSS digital audio (PCM) emulation (/dev/dsp*), say Y
80 here and read <file:Documentation/sound/alsa/OSS-Emulation.txt>.
82 Many programs still use the OSS API, so say Y.
84 To compile this driver as a module, choose M here: the module
85 will be called snd-pcm-oss.
87 config SND_PCM_OSS_PLUGINS
88 bool "OSS PCM (digital audio) API - Include plugin system"
89 depends on SND_PCM_OSS
92 If you disable this option, the ALSA's OSS PCM API will not
93 support conversion of channels, formats and rates. It will
94 behave like most of new OSS/Free drivers in 2.4/2.6 kernels.
97 bool "PCM timer interface" if EXPERT
100 If you disable this option, pcm timer will be inavailable, so
101 those stubs used pcm timer (e.g. dmix, dsnoop & co) may work
104 For some embedded device, we may disable it to reduce memory
105 footprint, about 20KB on x86_64 platform.
107 config SND_SEQUENCER_OSS
108 bool "OSS Sequencer API"
109 depends on SND_SEQUENCER
112 Say Y here to enable OSS sequencer emulation (both
113 /dev/sequencer and /dev/music interfaces).
115 Many programs still use the OSS API, so say Y.
117 If you choose M in "Sequencer support" (SND_SEQUENCER),
118 this will be compiled as a module. The module will be called
122 tristate "HR-timer backend support"
123 depends on HIGH_RES_TIMERS
126 Say Y here to enable HR-timer backend for ALSA timer. ALSA uses
127 the hrtimer as a precise timing source. The ALSA sequencer code
128 also can use this timing source.
130 To compile this driver as a module, choose M here: the module
131 will be called snd-hrtimer.
133 config SND_SEQ_HRTIMER_DEFAULT
134 bool "Use HR-timer as default sequencer timer"
135 depends on SND_HRTIMER && SND_SEQUENCER
138 Say Y here to use the HR-timer backend as the default sequencer
142 tristate "RTC Timer support"
146 Say Y here to enable RTC timer support for ALSA. ALSA uses
147 the RTC timer as a precise timing source and maps the RTC
148 timer to ALSA's timer interface. The ALSA sequencer code also
149 can use this timing source.
151 To compile this driver as a module, choose M here: the module
152 will be called snd-rtctimer.
154 Note that this option is exclusive with the new RTC drivers
155 (CONFIG_RTC_CLASS) since this requires the old API.
157 config SND_SEQ_RTCTIMER_DEFAULT
158 bool "Use RTC as default sequencer timer"
159 depends on SND_RTCTIMER && SND_SEQUENCER
160 depends on !SND_SEQ_HRTIMER_DEFAULT
163 Say Y here to use the RTC timer as the default sequencer
164 timer. This is strongly recommended because it ensures
165 precise MIDI timing even when the system timer runs at less
170 config SND_DYNAMIC_MINORS
171 bool "Dynamic device file minor numbers"
173 If you say Y here, the minor numbers of ALSA device files in
174 /dev/snd/ are allocated dynamically. This allows you to have
175 more than 8 sound cards, but requires a dynamic device file
178 If you are unsure about this, say N here.
181 int "Max number of sound cards"
184 depends on SND_DYNAMIC_MINORS
186 Specify the max number of sound cards that can be assigned
189 config SND_SUPPORT_OLD_API
190 bool "Support old ALSA API"
193 Say Y here to support the obsolete ALSA PCM API (ver.0.9.0 rc3
197 bool "Sound Proc FS Support" if EXPERT
201 Say 'N' to disable Sound proc FS, which may reduce code size about
202 9KB on x86_64 platform.
205 config SND_VERBOSE_PROCFS
206 bool "Verbose procfs contents"
207 depends on SND_PROC_FS
210 Say Y here to include code for verbose procfs contents (provides
211 useful information to developers when a problem occurs). On the
212 other side, it makes the ALSA subsystem larger.
214 config SND_VERBOSE_PRINTK
215 bool "Verbose printk"
217 Say Y here to enable verbose log messages. These messages
218 will help to identify source file and position containing
221 You don't need this unless you're debugging ALSA.
226 Say Y here to enable ALSA debug code.
228 config SND_DEBUG_VERBOSE
229 bool "More verbose debug"
232 Say Y here to enable extra-verbose debugging messages.
234 Let me repeat: it enables EXTRA-VERBOSE DEBUGGING messages.
235 So, say Y only if you are ready to be annoyed.
237 config SND_PCM_XRUN_DEBUG
238 bool "Enable PCM ring buffer overrun/underrun debugging"
240 depends on SND_DEBUG && SND_VERBOSE_PROCFS
242 Say Y to enable the PCM ring buffer overrun/underrun debugging.
243 It is usually not required, but if you have trouble with
244 sound clicking when system is loaded, it may help to determine
245 the process or driver which causes the scheduling gaps.
254 source "sound/core/seq/Kconfig"