1# ALSA soundcard-configuration 2config SND_TIMER 3 tristate 4 5config SND_PCM 6 tristate 7 select SND_TIMER 8 9config SND_DMAENGINE_PCM 10 tristate 11 12config SND_HWDEP 13 tristate 14 15config SND_RAWMIDI 16 tristate 17 18config SND_COMPRESS_OFFLOAD 19 tristate 20 21# To be effective this also requires INPUT - users should say: 22# select SND_JACK if INPUT=y || INPUT=SND 23# to avoid having to force INPUT on. 24config SND_JACK 25 bool 26 27config SND_SEQUENCER 28 tristate "Sequencer support" 29 select SND_TIMER 30 help 31 Say Y or M to enable MIDI sequencer and router support. This 32 feature allows routing and enqueueing of MIDI events. Events 33 can be processed at a given time. 34 35 Many programs require this feature, so you should enable it 36 unless you know what you're doing. 37 38config SND_SEQ_DUMMY 39 tristate "Sequencer dummy client" 40 depends on SND_SEQUENCER 41 help 42 Say Y here to enable the dummy sequencer client. This client 43 is a simple MIDI-through client: all normal input events are 44 redirected to the output port immediately. 45 46 You don't need this unless you want to connect many MIDI 47 devices or applications together. 48 49 To compile this driver as a module, choose M here: the module 50 will be called snd-seq-dummy. 51 52config SND_OSSEMUL 53 select SOUND_OSS_CORE 54 bool 55 56config SND_MIXER_OSS 57 tristate "OSS Mixer API" 58 select SND_OSSEMUL 59 help 60 To enable OSS mixer API emulation (/dev/mixer*), say Y here 61 and read <file:Documentation/sound/alsa/OSS-Emulation.txt>. 62 63 Many programs still use the OSS API, so say Y. 64 65 To compile this driver as a module, choose M here: the module 66 will be called snd-mixer-oss. 67 68config SND_PCM_OSS 69 tristate "OSS PCM (digital audio) API" 70 select SND_OSSEMUL 71 select SND_PCM 72 help 73 To enable OSS digital audio (PCM) emulation (/dev/dsp*), say Y 74 here and read <file:Documentation/sound/alsa/OSS-Emulation.txt>. 75 76 Many programs still use the OSS API, so say Y. 77 78 To compile this driver as a module, choose M here: the module 79 will be called snd-pcm-oss. 80 81config SND_PCM_OSS_PLUGINS 82 bool "OSS PCM (digital audio) API - Include plugin system" 83 depends on SND_PCM_OSS 84 default y 85 help 86 If you disable this option, the ALSA's OSS PCM API will not 87 support conversion of channels, formats and rates. It will 88 behave like most of new OSS/Free drivers in 2.4/2.6 kernels. 89 90config SND_SEQUENCER_OSS 91 bool "OSS Sequencer API" 92 depends on SND_SEQUENCER 93 select SND_OSSEMUL 94 help 95 Say Y here to enable OSS sequencer emulation (both 96 /dev/sequencer and /dev/music interfaces). 97 98 Many programs still use the OSS API, so say Y. 99 100 If you choose M in "Sequencer support" (SND_SEQUENCER), 101 this will be compiled as a module. The module will be called 102 snd-seq-oss. 103 104config SND_HRTIMER 105 tristate "HR-timer backend support" 106 depends on HIGH_RES_TIMERS 107 select SND_TIMER 108 help 109 Say Y here to enable HR-timer backend for ALSA timer. ALSA uses 110 the hrtimer as a precise timing source. The ALSA sequencer code 111 also can use this timing source. 112 113 To compile this driver as a module, choose M here: the module 114 will be called snd-hrtimer. 115 116config SND_SEQ_HRTIMER_DEFAULT 117 bool "Use HR-timer as default sequencer timer" 118 depends on SND_HRTIMER && SND_SEQUENCER 119 default y 120 help 121 Say Y here to use the HR-timer backend as the default sequencer 122 timer. 123 124config SND_RTCTIMER 125 tristate "RTC Timer support" 126 depends on RTC 127 select SND_TIMER 128 help 129 Say Y here to enable RTC timer support for ALSA. ALSA uses 130 the RTC timer as a precise timing source and maps the RTC 131 timer to ALSA's timer interface. The ALSA sequencer code also 132 can use this timing source. 133 134 To compile this driver as a module, choose M here: the module 135 will be called snd-rtctimer. 136 137 Note that this option is exclusive with the new RTC drivers 138 (CONFIG_RTC_CLASS) since this requires the old API. 139 140config SND_SEQ_RTCTIMER_DEFAULT 141 bool "Use RTC as default sequencer timer" 142 depends on SND_RTCTIMER && SND_SEQUENCER 143 depends on !SND_SEQ_HRTIMER_DEFAULT 144 default y 145 help 146 Say Y here to use the RTC timer as the default sequencer 147 timer. This is strongly recommended because it ensures 148 precise MIDI timing even when the system timer runs at less 149 than 1000 Hz. 150 151 If in doubt, say Y. 152 153config SND_DYNAMIC_MINORS 154 bool "Dynamic device file minor numbers" 155 help 156 If you say Y here, the minor numbers of ALSA device files in 157 /dev/snd/ are allocated dynamically. This allows you to have 158 more than 8 sound cards, but requires a dynamic device file 159 system like udev. 160 161 If you are unsure about this, say N here. 162 163config SND_MAX_CARDS 164 int "Max number of sound cards" 165 range 4 256 166 default 32 167 depends on SND_DYNAMIC_MINORS 168 help 169 Specify the max number of sound cards that can be assigned 170 on a single machine. 171 172config SND_SUPPORT_OLD_API 173 bool "Support old ALSA API" 174 default y 175 help 176 Say Y here to support the obsolete ALSA PCM API (ver.0.9.0 rc3 177 or older). 178 179config SND_VERBOSE_PROCFS 180 bool "Verbose procfs contents" 181 depends on PROC_FS 182 default y 183 help 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. 187 188config SND_VERBOSE_PRINTK 189 bool "Verbose printk" 190 help 191 Say Y here to enable verbose log messages. These messages 192 will help to identify source file and position containing 193 printed messages. 194 195 You don't need this unless you're debugging ALSA. 196 197config SND_DEBUG 198 bool "Debug" 199 help 200 Say Y here to enable ALSA debug code. 201 202config SND_DEBUG_VERBOSE 203 bool "More verbose debug" 204 depends on SND_DEBUG 205 help 206 Say Y here to enable extra-verbose debugging messages. 207 208 Let me repeat: it enables EXTRA-VERBOSE DEBUGGING messages. 209 So, say Y only if you are ready to be annoyed. 210 211config SND_PCM_XRUN_DEBUG 212 bool "Enable PCM ring buffer overrun/underrun debugging" 213 default n 214 depends on SND_DEBUG && SND_VERBOSE_PROCFS 215 help 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. 220 221config SND_VMASTER 222 bool 223 224config SND_KCTL_JACK 225 bool 226 227config SND_DMA_SGBUF 228 def_bool y 229 depends on X86 230 231source "sound/core/seq/Kconfig" 232