1 # ALSA soundcard-configuration
9 config SND_DMAENGINE_PCM
18 config SND_COMPRESS_OFFLOAD
21 # To be effective this also requires INPUT - users should say:
22 # select SND_JACK if INPUT=y || INPUT=SND
23 # to avoid having to force INPUT on.
28 tristate "Sequencer support"
31 Say Y or M to enable MIDI sequencer and router support. This
32 feature allows routing and enqueueing of MIDI events. Events
33 can be processed at a given time.
35 Many programs require this feature, so you should enable it
36 unless you know what you're doing.
39 tristate "Sequencer dummy client"
40 depends on SND_SEQUENCER
42 Say Y here to enable the dummy sequencer client. This client
43 is a simple MIDI-through client: all normal input events are
44 redirected to the output port immediately.
46 You don't need this unless you want to connect many MIDI
47 devices or applications together.
49 To compile this driver as a module, choose M here: the module
50 will be called snd-seq-dummy.
57 tristate "OSS Mixer API"
60 To enable OSS mixer API emulation (/dev/mixer*), say Y here
61 and read <file:Documentation/sound/alsa/OSS-Emulation.txt>.
63 Many programs still use the OSS API, so say Y.
65 To compile this driver as a module, choose M here: the module
66 will be called snd-mixer-oss.
69 tristate "OSS PCM (digital audio) API"
73 To enable OSS digital audio (PCM) emulation (/dev/dsp*), say Y
74 here and read <file:Documentation/sound/alsa/OSS-Emulation.txt>.
76 Many programs still use the OSS API, so say Y.
78 To compile this driver as a module, choose M here: the module
79 will be called snd-pcm-oss.
81 config SND_PCM_OSS_PLUGINS
82 bool "OSS PCM (digital audio) API - Include plugin system"
83 depends on SND_PCM_OSS
86 If you disable this option, the ALSA's OSS PCM API will not
87 support conversion of channels, formats and rates. It will
88 behave like most of new OSS/Free drivers in 2.4/2.6 kernels.
90 config SND_SEQUENCER_OSS
91 bool "OSS Sequencer API"
92 depends on SND_SEQUENCER
95 Say Y here to enable OSS sequencer emulation (both
96 /dev/sequencer and /dev/music interfaces).
98 Many programs still use the OSS API, so say Y.
100 If you choose M in "Sequencer support" (SND_SEQUENCER),
101 this will be compiled as a module. The module will be called
105 tristate "HR-timer backend support"
106 depends on HIGH_RES_TIMERS
109 Say Y here to enable HR-timer backend for ALSA timer. ALSA uses
110 the hrtimer as a precise timing source. The ALSA sequencer code
111 also can use this timing source.
113 To compile this driver as a module, choose M here: the module
114 will be called snd-hrtimer.
116 config SND_SEQ_HRTIMER_DEFAULT
117 bool "Use HR-timer as default sequencer timer"
118 depends on SND_HRTIMER && SND_SEQUENCER
121 Say Y here to use the HR-timer backend as the default sequencer
125 tristate "RTC Timer support"
129 Say Y here to enable RTC timer support for ALSA. ALSA uses
130 the RTC timer as a precise timing source and maps the RTC
131 timer to ALSA's timer interface. The ALSA sequencer code also
132 can use this timing source.
134 To compile this driver as a module, choose M here: the module
135 will be called snd-rtctimer.
137 Note that this option is exclusive with the new RTC drivers
138 (CONFIG_RTC_CLASS) since this requires the old API.
140 config SND_SEQ_RTCTIMER_DEFAULT
141 bool "Use RTC as default sequencer timer"
142 depends on SND_RTCTIMER && SND_SEQUENCER
143 depends on !SND_SEQ_HRTIMER_DEFAULT
146 Say Y here to use the RTC timer as the default sequencer
147 timer. This is strongly recommended because it ensures
148 precise MIDI timing even when the system timer runs at less
153 config SND_DYNAMIC_MINORS
154 bool "Dynamic device file minor numbers"
156 If you say Y here, the minor numbers of ALSA device files in
157 /dev/snd/ are allocated dynamically. This allows you to have
158 more than 8 sound cards, but requires a dynamic device file
161 If you are unsure about this, say N here.
164 int "Max number of sound cards"
167 depends on SND_DYNAMIC_MINORS
169 Specify the max number of sound cards that can be assigned
172 config SND_SUPPORT_OLD_API
173 bool "Support old ALSA API"
176 Say Y here to support the obsolete ALSA PCM API (ver.0.9.0 rc3
179 config SND_VERBOSE_PROCFS
180 bool "Verbose procfs contents"
184 Say Y here to include code for verbose procfs contents (provides
185 useful information to developers when a problem occurs). On the
186 other side, it makes the ALSA subsystem larger.
188 config SND_VERBOSE_PRINTK
189 bool "Verbose printk"
191 Say Y here to enable verbose log messages. These messages
192 will help to identify source file and position containing
195 You don't need this unless you're debugging ALSA.
200 Say Y here to enable ALSA debug code.
202 config SND_DEBUG_VERBOSE
203 bool "More verbose debug"
206 Say Y here to enable extra-verbose debugging messages.
208 Let me repeat: it enables EXTRA-VERBOSE DEBUGGING messages.
209 So, say Y only if you are ready to be annoyed.
211 config SND_PCM_XRUN_DEBUG
212 bool "Enable PCM ring buffer overrun/underrun debugging"
214 depends on SND_DEBUG && SND_VERBOSE_PROCFS
216 Say Y to enable the PCM ring buffer overrun/underrun debugging.
217 It is usually not required, but if you have trouble with
218 sound clicking when system is loaded, it may help to determine
219 the process or driver which causes the scheduling gaps.
231 source "sound/core/seq/Kconfig"