1 # ALSA soundcard-configuration
7 select SND_TIMER if SND_PCM_TIMER
15 config SND_DMAENGINE_PCM
24 config SND_COMPRESS_OFFLOAD
30 # enable input device support in jack layer
31 config SND_JACK_INPUT_DEV
34 default y if INPUT=y || INPUT=SND
37 tristate "Sequencer support"
40 Say Y or M to enable MIDI sequencer and router support. This
41 feature allows routing and enqueueing of MIDI events. Events
42 can be processed at a given time.
44 Many programs require this feature, so you should enable it
45 unless you know what you're doing.
48 tristate "Sequencer dummy client"
49 depends on SND_SEQUENCER
51 Say Y here to enable the dummy sequencer client. This client
52 is a simple MIDI-through client: all normal input events are
53 redirected to the output port immediately.
55 You don't need this unless you want to connect many MIDI
56 devices or applications together.
58 To compile this driver as a module, choose M here: the module
59 will be called snd-seq-dummy.
66 tristate "OSS Mixer API"
69 To enable OSS mixer API emulation (/dev/mixer*), say Y here
70 and read <file:Documentation/sound/alsa/OSS-Emulation.txt>.
72 Many programs still use the OSS API, so say Y.
74 To compile this driver as a module, choose M here: the module
75 will be called snd-mixer-oss.
78 tristate "OSS PCM (digital audio) API"
82 To enable OSS digital audio (PCM) emulation (/dev/dsp*), say Y
83 here and read <file:Documentation/sound/alsa/OSS-Emulation.txt>.
85 Many programs still use the OSS API, so say Y.
87 To compile this driver as a module, choose M here: the module
88 will be called snd-pcm-oss.
90 config SND_PCM_OSS_PLUGINS
91 bool "OSS PCM (digital audio) API - Include plugin system"
92 depends on SND_PCM_OSS
95 If you disable this option, the ALSA's OSS PCM API will not
96 support conversion of channels, formats and rates. It will
97 behave like most of new OSS/Free drivers in 2.4/2.6 kernels.
100 bool "PCM timer interface" if EXPERT
103 If you disable this option, pcm timer will be unavailable, so
104 those stubs that use pcm timer (e.g. dmix, dsnoop & co) may work
107 For some embedded devices, we may disable it to reduce memory
108 footprint, about 20KB on x86_64 platform.
110 config SND_SEQUENCER_OSS
111 bool "OSS Sequencer API"
112 depends on SND_SEQUENCER
115 Say Y here to enable OSS sequencer emulation (both
116 /dev/sequencer and /dev/music interfaces).
118 Many programs still use the OSS API, so say Y.
120 If you choose M in "Sequencer support" (SND_SEQUENCER),
121 this will be compiled as a module. The module will be called
125 tristate "HR-timer backend support"
126 depends on HIGH_RES_TIMERS
129 Say Y here to enable HR-timer backend for ALSA timer. ALSA uses
130 the hrtimer as a precise timing source. The ALSA sequencer code
131 also can use this timing source.
133 To compile this driver as a module, choose M here: the module
134 will be called snd-hrtimer.
136 config SND_SEQ_HRTIMER_DEFAULT
137 bool "Use HR-timer as default sequencer timer"
138 depends on SND_HRTIMER && SND_SEQUENCER
141 Say Y here to use the HR-timer backend as the default sequencer
145 tristate "RTC Timer support"
149 Say Y here to enable RTC timer support for ALSA. ALSA uses
150 the RTC timer as a precise timing source and maps the RTC
151 timer to ALSA's timer interface. The ALSA sequencer code also
152 can use this timing source.
154 To compile this driver as a module, choose M here: the module
155 will be called snd-rtctimer.
157 Note that this option is exclusive with the new RTC drivers
158 (CONFIG_RTC_CLASS) since this requires the old API.
160 config SND_SEQ_RTCTIMER_DEFAULT
161 bool "Use RTC as default sequencer timer"
162 depends on SND_RTCTIMER && SND_SEQUENCER
163 depends on !SND_SEQ_HRTIMER_DEFAULT
166 Say Y here to use the RTC timer as the default sequencer
167 timer. This is strongly recommended because it ensures
168 precise MIDI timing even when the system timer runs at less
173 config SND_DYNAMIC_MINORS
174 bool "Dynamic device file minor numbers"
176 If you say Y here, the minor numbers of ALSA device files in
177 /dev/snd/ are allocated dynamically. This allows you to have
178 more than 8 sound cards, but requires a dynamic device file
181 If you are unsure about this, say N here.
184 int "Max number of sound cards"
187 depends on SND_DYNAMIC_MINORS
189 Specify the max number of sound cards that can be assigned
192 config SND_SUPPORT_OLD_API
193 bool "Support old ALSA API"
196 Say Y here to support the obsolete ALSA PCM API (ver.0.9.0 rc3
200 bool "Sound Proc FS Support" if EXPERT
204 Say 'N' to disable Sound proc FS, which may reduce code size about
205 9KB on x86_64 platform.
208 config SND_VERBOSE_PROCFS
209 bool "Verbose procfs contents"
210 depends on SND_PROC_FS
213 Say Y here to include code for verbose procfs contents (provides
214 useful information to developers when a problem occurs). On the
215 other side, it makes the ALSA subsystem larger.
217 config SND_VERBOSE_PRINTK
218 bool "Verbose printk"
220 Say Y here to enable verbose log messages. These messages
221 will help to identify source file and position containing
224 You don't need this unless you're debugging ALSA.
229 Say Y here to enable ALSA debug code.
231 config SND_DEBUG_VERBOSE
232 bool "More verbose debug"
235 Say Y here to enable extra-verbose debugging messages.
237 Let me repeat: it enables EXTRA-VERBOSE DEBUGGING messages.
238 So, say Y only if you are ready to be annoyed.
240 config SND_PCM_XRUN_DEBUG
241 bool "Enable PCM ring buffer overrun/underrun debugging"
243 depends on SND_DEBUG && SND_VERBOSE_PROCFS
245 Say Y to enable the PCM ring buffer overrun/underrun debugging.
246 It is usually not required, but if you have trouble with
247 sound clicking when system is loaded, it may help to determine
248 the process or driver which causes the scheduling gaps.
257 source "sound/core/seq/Kconfig"