1 # ALSA soundcard-configuration
20 tristate "Sequencer support"
24 Say Y or M to enable MIDI sequencer and router support. This
25 feature allows routing and enqueueing of MIDI events. Events
26 can be processed at a given time.
28 Many programs require this feature, so you should enable it
29 unless you know what you're doing.
32 tristate "Sequencer dummy client"
33 depends on SND_SEQUENCER
35 Say Y here to enable the dummy sequencer client. This client
36 is a simple MIDI-through client: all normal input events are
37 redirected to the output port immediately.
39 You don't need this unless you want to connect many MIDI
40 devices or applications together.
42 To compile this driver as a module, choose M here: the module
43 will be called snd-seq-dummy.
50 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"
68 To enable OSS digital audio (PCM) emulation (/dev/dsp*), say Y
69 here and read <file:Documentation/sound/alsa/OSS-Emulation.txt>.
71 Many programs still use the OSS API, so say Y.
73 To compile this driver as a module, choose M here: the module
74 will be called snd-pcm-oss.
76 config SND_PCM_OSS_PLUGINS
77 bool "OSS PCM (digital audio) API - Include plugin system"
78 depends on SND_PCM_OSS
81 If you disable this option, the ALSA's OSS PCM API will not
82 support conversion of channels, formats and rates. It will
83 behave like most of new OSS/Free drivers in 2.4/2.6 kernels.
85 config SND_SEQUENCER_OSS
86 bool "OSS Sequencer API"
87 depends on SND && SND_SEQUENCER
90 Say Y here to enable OSS sequencer emulation (both
91 /dev/sequencer and /dev/music interfaces).
93 Many programs still use the OSS API, so say Y.
95 If you choose M in "Sequencer support" (SND_SEQUENCER),
96 this will be compiled as a module. The module will be called
100 tristate "RTC Timer support"
101 depends on SND && RTC
104 Say Y here to enable RTC timer support for ALSA. ALSA uses
105 the RTC timer as a precise timing source and maps the RTC
106 timer to ALSA's timer interface. The ALSA sequencer code also
107 can use this timing source.
109 To compile this driver as a module, choose M here: the module
110 will be called snd-rtctimer.
112 config SND_SEQ_RTCTIMER_DEFAULT
113 bool "Use RTC as default sequencer timer"
114 depends on SND_RTCTIMER && SND_SEQUENCER
117 Say Y here to use the RTC timer as the default sequencer
118 timer. This is strongly recommended because it ensures
119 precise MIDI timing even when the system timer runs at less
124 config SND_DYNAMIC_MINORS
125 bool "Dynamic device file minor numbers"
128 If you say Y here, the minor numbers of ALSA device files in
129 /dev/snd/ are allocated dynamically. This allows you to have
130 more than 8 sound cards, but requires a dynamic device file
133 If you are unsure about this, say N here.
135 config SND_SUPPORT_OLD_API
136 bool "Support old ALSA API"
140 Say Y here to support the obsolete ALSA PCM API (ver.0.9.0 rc3
143 config SND_VERBOSE_PROCFS
144 bool "Verbose procfs contents"
145 depends on SND && PROC_FS
148 Say Y here to include code for verbose procfs contents (provides
149 useful information to developers when a problem occurs). On the
150 other side, it makes the ALSA subsystem larger.
152 config SND_VERBOSE_PRINTK
153 bool "Verbose printk"
156 Say Y here to enable verbose log messages. These messages
157 will help to identify source file and position containing
160 You don't need this unless you're debugging ALSA.
166 Say Y here to enable ALSA debug code.
168 config SND_DEBUG_DETECT
169 bool "Debug detection"
172 Say Y here to enable extra-verbose log messages printed when
175 config SND_PCM_XRUN_DEBUG
176 bool "Enable PCM ring buffer overrun/underrun debugging"
178 depends on SND_DEBUG && SND_VERBOSE_PROCFS
180 Say Y to enable the PCM ring buffer overrun/underrun debugging.
181 It is usually not required, but if you have trouble with
182 sound clicking when system is loaded, it may help to determine
183 the process or driver which causes the scheduling gaps.