1 # ALSA soundcard-configuration
12 config SND_DMAENGINE_PCM
21 config SND_COMPRESS_OFFLOAD
24 # To be effective this also requires INPUT - users should say:
25 # select SND_JACK if INPUT=y || INPUT=SND
26 # to avoid having to force INPUT on.
31 tristate "Sequencer support"
34 Say Y or M to enable MIDI sequencer and router support. This
35 feature allows routing and enqueueing of MIDI events. Events
36 can be processed at a given time.
38 Many programs require this feature, so you should enable it
39 unless you know what you're doing.
42 tristate "Sequencer dummy client"
43 depends on SND_SEQUENCER
45 Say Y here to enable the dummy sequencer client. This client
46 is a simple MIDI-through client: all normal input events are
47 redirected to the output port immediately.
49 You don't need this unless you want to connect many MIDI
50 devices or applications together.
52 To compile this driver as a module, choose M here: the module
53 will be called snd-seq-dummy.
60 tristate "OSS Mixer API"
63 To enable OSS mixer API emulation (/dev/mixer*), say Y here
64 and read <file:Documentation/sound/alsa/OSS-Emulation.txt>.
66 Many programs still use the OSS API, so say Y.
68 To compile this driver as a module, choose M here: the module
69 will be called snd-mixer-oss.
72 tristate "OSS PCM (digital audio) API"
76 To enable OSS digital audio (PCM) emulation (/dev/dsp*), say Y
77 here and read <file:Documentation/sound/alsa/OSS-Emulation.txt>.
79 Many programs still use the OSS API, so say Y.
81 To compile this driver as a module, choose M here: the module
82 will be called snd-pcm-oss.
84 config SND_PCM_OSS_PLUGINS
85 bool "OSS PCM (digital audio) API - Include plugin system"
86 depends on SND_PCM_OSS
89 If you disable this option, the ALSA's OSS PCM API will not
90 support conversion of channels, formats and rates. It will
91 behave like most of new OSS/Free drivers in 2.4/2.6 kernels.
93 config SND_SEQUENCER_OSS
94 bool "OSS Sequencer API"
95 depends on SND_SEQUENCER
98 Say Y here to enable OSS sequencer emulation (both
99 /dev/sequencer and /dev/music interfaces).
101 Many programs still use the OSS API, so say Y.
103 If you choose M in "Sequencer support" (SND_SEQUENCER),
104 this will be compiled as a module. The module will be called
108 tristate "HR-timer backend support"
109 depends on HIGH_RES_TIMERS
112 Say Y here to enable HR-timer backend for ALSA timer. ALSA uses
113 the hrtimer as a precise timing source. The ALSA sequencer code
114 also can use this timing source.
116 To compile this driver as a module, choose M here: the module
117 will be called snd-hrtimer.
119 config SND_SEQ_HRTIMER_DEFAULT
120 bool "Use HR-timer as default sequencer timer"
121 depends on SND_HRTIMER && SND_SEQUENCER
124 Say Y here to use the HR-timer backend as the default sequencer
128 tristate "RTC Timer support"
132 Say Y here to enable RTC timer support for ALSA. ALSA uses
133 the RTC timer as a precise timing source and maps the RTC
134 timer to ALSA's timer interface. The ALSA sequencer code also
135 can use this timing source.
137 To compile this driver as a module, choose M here: the module
138 will be called snd-rtctimer.
140 Note that this option is exclusive with the new RTC drivers
141 (CONFIG_RTC_CLASS) since this requires the old API.
143 config SND_SEQ_RTCTIMER_DEFAULT
144 bool "Use RTC as default sequencer timer"
145 depends on SND_RTCTIMER && SND_SEQUENCER
146 depends on !SND_SEQ_HRTIMER_DEFAULT
149 Say Y here to use the RTC timer as the default sequencer
150 timer. This is strongly recommended because it ensures
151 precise MIDI timing even when the system timer runs at less
156 config SND_DYNAMIC_MINORS
157 bool "Dynamic device file minor numbers"
159 If you say Y here, the minor numbers of ALSA device files in
160 /dev/snd/ are allocated dynamically. This allows you to have
161 more than 8 sound cards, but requires a dynamic device file
164 If you are unsure about this, say N here.
167 int "Max number of sound cards"
170 depends on SND_DYNAMIC_MINORS
172 Specify the max number of sound cards that can be assigned
175 config SND_SUPPORT_OLD_API
176 bool "Support old ALSA API"
179 Say Y here to support the obsolete ALSA PCM API (ver.0.9.0 rc3
182 config SND_VERBOSE_PROCFS
183 bool "Verbose procfs contents"
187 Say Y here to include code for verbose procfs contents (provides
188 useful information to developers when a problem occurs). On the
189 other side, it makes the ALSA subsystem larger.
191 config SND_VERBOSE_PRINTK
192 bool "Verbose printk"
194 Say Y here to enable verbose log messages. These messages
195 will help to identify source file and position containing
198 You don't need this unless you're debugging ALSA.
203 Say Y here to enable ALSA debug code.
205 config SND_DEBUG_VERBOSE
206 bool "More verbose debug"
209 Say Y here to enable extra-verbose debugging messages.
211 Let me repeat: it enables EXTRA-VERBOSE DEBUGGING messages.
212 So, say Y only if you are ready to be annoyed.
214 config SND_PCM_XRUN_DEBUG
215 bool "Enable PCM ring buffer overrun/underrun debugging"
217 depends on SND_DEBUG && SND_VERBOSE_PROCFS
219 Say Y to enable the PCM ring buffer overrun/underrun debugging.
220 It is usually not required, but if you have trouble with
221 sound clicking when system is loaded, it may help to determine
222 the process or driver which causes the scheduling gaps.
234 source "sound/core/seq/Kconfig"