1 # ALSA soundcard-configuration
15 # To be effective this also requires INPUT - users should say:
16 # select SND_JACK if INPUT=y || INPUT=SND
17 # to avoid having to force INPUT on.
22 tristate "Sequencer support"
25 Say Y or M to enable MIDI sequencer and router support. This
26 feature allows routing and enqueueing of MIDI events. Events
27 can be processed at a given time.
29 Many programs require this feature, so you should enable it
30 unless you know what you're doing.
33 tristate "Sequencer dummy client"
34 depends on SND_SEQUENCER
36 Say Y here to enable the dummy sequencer client. This client
37 is a simple MIDI-through client: all normal input events are
38 redirected to the output port immediately.
40 You don't need this unless you want to connect many MIDI
41 devices or applications together.
43 To compile this driver as a module, choose M here: the module
44 will be called snd-seq-dummy.
51 tristate "OSS Mixer API"
54 To enable OSS mixer API emulation (/dev/mixer*), say Y here
55 and read <file:Documentation/sound/alsa/OSS-Emulation.txt>.
57 Many programs still use the OSS API, so say Y.
59 To compile this driver as a module, choose M here: the module
60 will be called snd-mixer-oss.
63 tristate "OSS PCM (digital audio) API"
67 To enable OSS digital audio (PCM) emulation (/dev/dsp*), say Y
68 here and read <file:Documentation/sound/alsa/OSS-Emulation.txt>.
70 Many programs still use the OSS API, so say Y.
72 To compile this driver as a module, choose M here: the module
73 will be called snd-pcm-oss.
75 config SND_PCM_OSS_PLUGINS
76 bool "OSS PCM (digital audio) API - Include plugin system"
77 depends on SND_PCM_OSS
80 If you disable this option, the ALSA's OSS PCM API will not
81 support conversion of channels, formats and rates. It will
82 behave like most of new OSS/Free drivers in 2.4/2.6 kernels.
84 config SND_SEQUENCER_OSS
85 bool "OSS Sequencer API"
86 depends on SND_SEQUENCER
89 Say Y here to enable OSS sequencer emulation (both
90 /dev/sequencer and /dev/music interfaces).
92 Many programs still use the OSS API, so say Y.
94 If you choose M in "Sequencer support" (SND_SEQUENCER),
95 this will be compiled as a module. The module will be called
99 tristate "HR-timer backend support"
100 depends on HIGH_RES_TIMERS
103 Say Y here to enable HR-timer backend for ALSA timer. ALSA uses
104 the hrtimer as a precise timing source. The ALSA sequencer code
105 also can use this timing source.
107 To compile this driver as a module, choose M here: the module
108 will be called snd-hrtimer.
110 config SND_SEQ_HRTIMER_DEFAULT
111 bool "Use HR-timer as default sequencer timer"
112 depends on SND_HRTIMER && SND_SEQUENCER
115 Say Y here to use the HR-timer backend as the default sequencer
119 tristate "RTC Timer support"
123 Say Y here to enable RTC timer support for ALSA. ALSA uses
124 the RTC timer as a precise timing source and maps the RTC
125 timer to ALSA's timer interface. The ALSA sequencer code also
126 can use this timing source.
128 To compile this driver as a module, choose M here: the module
129 will be called snd-rtctimer.
131 Note that this option is exclusive with the new RTC drivers
132 (CONFIG_RTC_CLASS) since this requires the old API.
134 config SND_SEQ_RTCTIMER_DEFAULT
135 bool "Use RTC as default sequencer timer"
136 depends on SND_RTCTIMER && SND_SEQUENCER
137 depends on !SND_SEQ_HRTIMER_DEFAULT
140 Say Y here to use the RTC timer as the default sequencer
141 timer. This is strongly recommended because it ensures
142 precise MIDI timing even when the system timer runs at less
147 config SND_DYNAMIC_MINORS
148 bool "Dynamic device file minor numbers"
150 If you say Y here, the minor numbers of ALSA device files in
151 /dev/snd/ are allocated dynamically. This allows you to have
152 more than 8 sound cards, but requires a dynamic device file
155 If you are unsure about this, say N here.
157 config SND_SUPPORT_OLD_API
158 bool "Support old ALSA API"
161 Say Y here to support the obsolete ALSA PCM API (ver.0.9.0 rc3
164 config SND_VERBOSE_PROCFS
165 bool "Verbose procfs contents"
169 Say Y here to include code for verbose procfs contents (provides
170 useful information to developers when a problem occurs). On the
171 other side, it makes the ALSA subsystem larger.
173 config SND_VERBOSE_PRINTK
174 bool "Verbose printk"
176 Say Y here to enable verbose log messages. These messages
177 will help to identify source file and position containing
180 You don't need this unless you're debugging ALSA.
185 Say Y here to enable ALSA debug code.
187 config SND_DEBUG_VERBOSE
188 bool "More verbose debug"
191 Say Y here to enable extra-verbose debugging messages.
193 Let me repeat: it enables EXTRA-VERBOSE DEBUGGING messages.
194 So, say Y only if you are ready to be annoyed.
196 config SND_PCM_XRUN_DEBUG
197 bool "Enable PCM ring buffer overrun/underrun debugging"
199 depends on SND_DEBUG && SND_VERBOSE_PROCFS
201 Say Y to enable the PCM ring buffer overrun/underrun debugging.
202 It is usually not required, but if you have trouble with
203 sound clicking when system is loaded, it may help to determine
204 the process or driver which causes the scheduling gaps.
209 source "sound/core/seq/Kconfig"