Root/sound/core/Kconfig

1# ALSA soundcard-configuration
2config SND_TIMER
3    tristate
4
5config SND_PCM
6    tristate
7    select SND_TIMER
8
9config SND_HWDEP
10    tristate "Sound hardware support"
11
12config SND_RAWMIDI
13    tristate
14
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.
18config SND_JACK
19    bool
20
21config SND_SEQUENCER
22    tristate "Sequencer support"
23    select SND_TIMER
24    help
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.
28
29      Many programs require this feature, so you should enable it
30      unless you know what you're doing.
31
32config SND_SEQ_DUMMY
33    tristate "Sequencer dummy client"
34    depends on SND_SEQUENCER
35    help
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.
39
40      You don't need this unless you want to connect many MIDI
41      devices or applications together.
42
43      To compile this driver as a module, choose M here: the module
44      will be called snd-seq-dummy.
45
46config SND_OSSEMUL
47    select SOUND_OSS_CORE
48    bool
49
50config SND_MIXER_OSS
51    tristate "OSS Mixer API"
52    select SND_OSSEMUL
53    help
54      To enable OSS mixer API emulation (/dev/mixer*), say Y here
55      and read <file:Documentation/sound/alsa/OSS-Emulation.txt>.
56
57      Many programs still use the OSS API, so say Y.
58
59      To compile this driver as a module, choose M here: the module
60      will be called snd-mixer-oss.
61
62config SND_PCM_OSS
63    tristate "OSS PCM (digital audio) API"
64    select SND_OSSEMUL
65    select SND_PCM
66    help
67      To enable OSS digital audio (PCM) emulation (/dev/dsp*), say Y
68      here and read <file:Documentation/sound/alsa/OSS-Emulation.txt>.
69
70      Many programs still use the OSS API, so say Y.
71
72      To compile this driver as a module, choose M here: the module
73      will be called snd-pcm-oss.
74
75config SND_PCM_OSS_PLUGINS
76    bool "OSS PCM (digital audio) API - Include plugin system"
77    depends on SND_PCM_OSS
78        default y
79    help
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.
83
84config SND_SEQUENCER_OSS
85    bool "OSS Sequencer API"
86    depends on SND_SEQUENCER
87    select SND_OSSEMUL
88    help
89      Say Y here to enable OSS sequencer emulation (both
90      /dev/sequencer and /dev/music interfaces).
91
92      Many programs still use the OSS API, so say Y.
93
94      If you choose M in "Sequencer support" (SND_SEQUENCER),
95      this will be compiled as a module. The module will be called
96      snd-seq-oss.
97
98config SND_HRTIMER
99    tristate "HR-timer backend support"
100    depends on HIGH_RES_TIMERS
101    select SND_TIMER
102    help
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.
106
107      To compile this driver as a module, choose M here: the module
108      will be called snd-hrtimer.
109
110config SND_SEQ_HRTIMER_DEFAULT
111    bool "Use HR-timer as default sequencer timer"
112    depends on SND_HRTIMER && SND_SEQUENCER
113    default y
114    help
115      Say Y here to use the HR-timer backend as the default sequencer
116      timer.
117
118config SND_RTCTIMER
119    tristate "RTC Timer support"
120    depends on RTC
121    select SND_TIMER
122    help
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.
127
128      To compile this driver as a module, choose M here: the module
129      will be called snd-rtctimer.
130
131      Note that this option is exclusive with the new RTC drivers
132      (CONFIG_RTC_CLASS) since this requires the old API.
133
134config 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
138    default y
139    help
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
143      than 1000 Hz.
144
145      If in doubt, say Y.
146
147config SND_DYNAMIC_MINORS
148    bool "Dynamic device file minor numbers"
149    help
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
153      system like udev.
154
155      If you are unsure about this, say N here.
156
157config SND_SUPPORT_OLD_API
158    bool "Support old ALSA API"
159    default y
160    help
161      Say Y here to support the obsolete ALSA PCM API (ver.0.9.0 rc3
162      or older).
163
164config SND_VERBOSE_PROCFS
165    bool "Verbose procfs contents"
166    depends on PROC_FS
167    default y
168    help
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.
172
173config SND_VERBOSE_PRINTK
174    bool "Verbose printk"
175    help
176      Say Y here to enable verbose log messages. These messages
177      will help to identify source file and position containing
178      printed messages.
179
180      You don't need this unless you're debugging ALSA.
181
182config SND_DEBUG
183    bool "Debug"
184    help
185      Say Y here to enable ALSA debug code.
186
187config SND_DEBUG_VERBOSE
188    bool "More verbose debug"
189    depends on SND_DEBUG
190    help
191      Say Y here to enable extra-verbose debugging messages.
192      
193      Let me repeat: it enables EXTRA-VERBOSE DEBUGGING messages.
194      So, say Y only if you are ready to be annoyed.
195
196config SND_PCM_XRUN_DEBUG
197    bool "Enable PCM ring buffer overrun/underrun debugging"
198    default n
199    depends on SND_DEBUG && SND_VERBOSE_PROCFS
200    help
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.
205
206config SND_VMASTER
207    bool
208
209config SND_DMA_SGBUF
210    def_bool y
211    depends on X86
212
213source "sound/core/seq/Kconfig"
214

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