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
144 config SND_DYNAMIC_MINORS
145 bool "Dynamic device file minor numbers"
147 If you say Y here, the minor numbers of ALSA device files in
148 /dev/snd/ are allocated dynamically. This allows you to have
149 more than 8 sound cards, but requires a dynamic device file
152 If you are unsure about this, say N here.
155 int "Max number of sound cards"
158 depends on SND_DYNAMIC_MINORS
160 Specify the max number of sound cards that can be assigned
163 config SND_SUPPORT_OLD_API
164 bool "Support old ALSA API"
167 Say Y here to support the obsolete ALSA PCM API (ver.0.9.0 rc3
171 bool "Sound Proc FS Support" if EXPERT
175 Say 'N' to disable Sound proc FS, which may reduce code size about
176 9KB on x86_64 platform.
179 config SND_VERBOSE_PROCFS
180 bool "Verbose procfs contents"
181 depends on SND_PROC_FS
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.
228 source "sound/core/seq/Kconfig"