Root/sound/core/Kconfig

1# ALSA soundcard-configuration
2config SND_TIMER
3    tristate
4
5config SND_PCM
6    tristate
7    select SND_TIMER
8    select GCD
9
10config SND_HWDEP
11    tristate
12
13config SND_RAWMIDI
14    tristate
15
16# To be effective this also requires INPUT - users should say:
17# select SND_JACK if INPUT=y || INPUT=SND
18# to avoid having to force INPUT on.
19config SND_JACK
20    bool
21
22config SND_SEQUENCER
23    tristate "Sequencer support"
24    select SND_TIMER
25    help
26      Say Y or M to enable MIDI sequencer and router support. This
27      feature allows routing and enqueueing of MIDI events. Events
28      can be processed at a given time.
29
30      Many programs require this feature, so you should enable it
31      unless you know what you're doing.
32
33config SND_SEQ_DUMMY
34    tristate "Sequencer dummy client"
35    depends on SND_SEQUENCER
36    help
37      Say Y here to enable the dummy sequencer client. This client
38      is a simple MIDI-through client: all normal input events are
39      redirected to the output port immediately.
40
41      You don't need this unless you want to connect many MIDI
42      devices or applications together.
43
44      To compile this driver as a module, choose M here: the module
45      will be called snd-seq-dummy.
46
47config SND_OSSEMUL
48    select SOUND_OSS_CORE
49    bool
50
51config SND_MIXER_OSS
52    tristate "OSS Mixer API"
53    select SND_OSSEMUL
54    help
55      To enable OSS mixer API emulation (/dev/mixer*), say Y here
56      and read <file:Documentation/sound/alsa/OSS-Emulation.txt>.
57
58      Many programs still use the OSS API, so say Y.
59
60      To compile this driver as a module, choose M here: the module
61      will be called snd-mixer-oss.
62
63config SND_PCM_OSS
64    tristate "OSS PCM (digital audio) API"
65    select SND_OSSEMUL
66    select SND_PCM
67    help
68      To enable OSS digital audio (PCM) emulation (/dev/dsp*), say Y
69      here and read <file:Documentation/sound/alsa/OSS-Emulation.txt>.
70
71      Many programs still use the OSS API, so say Y.
72
73      To compile this driver as a module, choose M here: the module
74      will be called snd-pcm-oss.
75
76config SND_PCM_OSS_PLUGINS
77    bool "OSS PCM (digital audio) API - Include plugin system"
78    depends on SND_PCM_OSS
79        default y
80    help
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.
84
85config SND_SEQUENCER_OSS
86    bool "OSS Sequencer API"
87    depends on SND_SEQUENCER
88    select SND_OSSEMUL
89    help
90      Say Y here to enable OSS sequencer emulation (both
91      /dev/sequencer and /dev/music interfaces).
92
93      Many programs still use the OSS API, so say Y.
94
95      If you choose M in "Sequencer support" (SND_SEQUENCER),
96      this will be compiled as a module. The module will be called
97      snd-seq-oss.
98
99config SND_HRTIMER
100    tristate "HR-timer backend support"
101    depends on HIGH_RES_TIMERS
102    select SND_TIMER
103    help
104      Say Y here to enable HR-timer backend for ALSA timer. ALSA uses
105      the hrtimer as a precise timing source. The ALSA sequencer code
106      also can use this timing source.
107
108      To compile this driver as a module, choose M here: the module
109      will be called snd-hrtimer.
110
111config SND_SEQ_HRTIMER_DEFAULT
112    bool "Use HR-timer as default sequencer timer"
113    depends on SND_HRTIMER && SND_SEQUENCER
114    default y
115    help
116      Say Y here to use the HR-timer backend as the default sequencer
117      timer.
118
119config SND_RTCTIMER
120    tristate "RTC Timer support"
121    depends on RTC
122    select SND_TIMER
123    help
124      Say Y here to enable RTC timer support for ALSA. ALSA uses
125      the RTC timer as a precise timing source and maps the RTC
126      timer to ALSA's timer interface. The ALSA sequencer code also
127      can use this timing source.
128
129      To compile this driver as a module, choose M here: the module
130      will be called snd-rtctimer.
131
132      Note that this option is exclusive with the new RTC drivers
133      (CONFIG_RTC_CLASS) since this requires the old API.
134
135config SND_SEQ_RTCTIMER_DEFAULT
136    bool "Use RTC as default sequencer timer"
137    depends on SND_RTCTIMER && SND_SEQUENCER
138    depends on !SND_SEQ_HRTIMER_DEFAULT
139    default y
140    help
141      Say Y here to use the RTC timer as the default sequencer
142      timer. This is strongly recommended because it ensures
143      precise MIDI timing even when the system timer runs at less
144      than 1000 Hz.
145
146      If in doubt, say Y.
147
148config SND_DYNAMIC_MINORS
149    bool "Dynamic device file minor numbers"
150    help
151      If you say Y here, the minor numbers of ALSA device files in
152      /dev/snd/ are allocated dynamically. This allows you to have
153      more than 8 sound cards, but requires a dynamic device file
154      system like udev.
155
156      If you are unsure about this, say N here.
157
158config SND_SUPPORT_OLD_API
159    bool "Support old ALSA API"
160    default y
161    help
162      Say Y here to support the obsolete ALSA PCM API (ver.0.9.0 rc3
163      or older).
164
165config SND_VERBOSE_PROCFS
166    bool "Verbose procfs contents"
167    depends on PROC_FS
168    default y
169    help
170      Say Y here to include code for verbose procfs contents (provides
171          useful information to developers when a problem occurs). On the
172          other side, it makes the ALSA subsystem larger.
173
174config SND_VERBOSE_PRINTK
175    bool "Verbose printk"
176    help
177      Say Y here to enable verbose log messages. These messages
178      will help to identify source file and position containing
179      printed messages.
180
181      You don't need this unless you're debugging ALSA.
182
183config SND_DEBUG
184    bool "Debug"
185    help
186      Say Y here to enable ALSA debug code.
187
188config SND_DEBUG_VERBOSE
189    bool "More verbose debug"
190    depends on SND_DEBUG
191    help
192      Say Y here to enable extra-verbose debugging messages.
193      
194      Let me repeat: it enables EXTRA-VERBOSE DEBUGGING messages.
195      So, say Y only if you are ready to be annoyed.
196
197config SND_PCM_XRUN_DEBUG
198    bool "Enable PCM ring buffer overrun/underrun debugging"
199    default n
200    depends on SND_DEBUG && SND_VERBOSE_PROCFS
201    help
202      Say Y to enable the PCM ring buffer overrun/underrun debugging.
203      It is usually not required, but if you have trouble with
204      sound clicking when system is loaded, it may help to determine
205      the process or driver which causes the scheduling gaps.
206
207config SND_VMASTER
208    bool
209
210config SND_DMA_SGBUF
211    def_bool y
212    depends on X86
213
214source "sound/core/seq/Kconfig"
215

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