1 # ALSA soundcard-configuration
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.
96 config SND_SEQUENCER_OSS
97 bool "OSS Sequencer API"
98 depends on SND_SEQUENCER
101 Say Y here to enable OSS sequencer emulation (both
102 /dev/sequencer and /dev/music interfaces).
104 Many programs still use the OSS API, so say Y.
106 If you choose M in "Sequencer support" (SND_SEQUENCER),
107 this will be compiled as a module. The module will be called
111 tristate "HR-timer backend support"
112 depends on HIGH_RES_TIMERS
115 Say Y here to enable HR-timer backend for ALSA timer. ALSA uses
116 the hrtimer as a precise timing source. The ALSA sequencer code
117 also can use this timing source.
119 To compile this driver as a module, choose M here: the module
120 will be called snd-hrtimer.
122 config SND_SEQ_HRTIMER_DEFAULT
123 bool "Use HR-timer as default sequencer timer"
124 depends on SND_HRTIMER && SND_SEQUENCER
127 Say Y here to use the HR-timer backend as the default sequencer
131 tristate "RTC Timer support"
135 Say Y here to enable RTC timer support for ALSA. ALSA uses
136 the RTC timer as a precise timing source and maps the RTC
137 timer to ALSA's timer interface. The ALSA sequencer code also
138 can use this timing source.
140 To compile this driver as a module, choose M here: the module
141 will be called snd-rtctimer.
143 Note that this option is exclusive with the new RTC drivers
144 (CONFIG_RTC_CLASS) since this requires the old API.
146 config SND_SEQ_RTCTIMER_DEFAULT
147 bool "Use RTC as default sequencer timer"
148 depends on SND_RTCTIMER && SND_SEQUENCER
149 depends on !SND_SEQ_HRTIMER_DEFAULT
152 Say Y here to use the RTC timer as the default sequencer
153 timer. This is strongly recommended because it ensures
154 precise MIDI timing even when the system timer runs at less
159 config SND_DYNAMIC_MINORS
160 bool "Dynamic device file minor numbers"
162 If you say Y here, the minor numbers of ALSA device files in
163 /dev/snd/ are allocated dynamically. This allows you to have
164 more than 8 sound cards, but requires a dynamic device file
167 If you are unsure about this, say N here.
170 int "Max number of sound cards"
173 depends on SND_DYNAMIC_MINORS
175 Specify the max number of sound cards that can be assigned
178 config SND_SUPPORT_OLD_API
179 bool "Support old ALSA API"
182 Say Y here to support the obsolete ALSA PCM API (ver.0.9.0 rc3
186 bool "Sound Proc FS Support" if EXPERT
190 Say 'N' to disable Sound proc FS, which may reduce code size about
191 9KB on x86_64 platform.
194 config SND_VERBOSE_PROCFS
195 bool "Verbose procfs contents"
196 depends on SND_PROC_FS
199 Say Y here to include code for verbose procfs contents (provides
200 useful information to developers when a problem occurs). On the
201 other side, it makes the ALSA subsystem larger.
203 config SND_VERBOSE_PRINTK
204 bool "Verbose printk"
206 Say Y here to enable verbose log messages. These messages
207 will help to identify source file and position containing
210 You don't need this unless you're debugging ALSA.
215 Say Y here to enable ALSA debug code.
217 config SND_DEBUG_VERBOSE
218 bool "More verbose debug"
221 Say Y here to enable extra-verbose debugging messages.
223 Let me repeat: it enables EXTRA-VERBOSE DEBUGGING messages.
224 So, say Y only if you are ready to be annoyed.
226 config SND_PCM_XRUN_DEBUG
227 bool "Enable PCM ring buffer overrun/underrun debugging"
229 depends on SND_DEBUG && SND_VERBOSE_PROCFS
231 Say Y to enable the PCM ring buffer overrun/underrun debugging.
232 It is usually not required, but if you have trouble with
233 sound clicking when system is loaded, it may help to determine
234 the process or driver which causes the scheduling gaps.
243 source "sound/core/seq/Kconfig"