1# ALSA soundcard-configuration 2config SND_TIMER 3 tristate 4 5config SND_PCM 6 tristate 7 select SND_TIMER if SND_PCM_TIMER 8 9config SND_PCM_ELD 10 bool 11 12config SND_PCM_IEC958 13 bool 14 15config SND_DMAENGINE_PCM 16 tristate 17 18config SND_HWDEP 19 tristate 20 21config SND_RAWMIDI 22 tristate 23 24config SND_COMPRESS_OFFLOAD 25 tristate 26 27config SND_JACK 28 bool 29 30# enable input device support in jack layer 31config SND_JACK_INPUT_DEV 32 bool 33 depends on SND_JACK 34 default y if INPUT=y || INPUT=SND 35 36config SND_SEQUENCER 37 tristate "Sequencer support" 38 select SND_TIMER 39 help 40 Say Y or M to enable MIDI sequencer and router support. This 41 feature allows routing and enqueueing of MIDI events. Events 42 can be processed at a given time. 43 44 Many programs require this feature, so you should enable it 45 unless you know what you're doing. 46 47config SND_SEQ_DUMMY 48 tristate "Sequencer dummy client" 49 depends on SND_SEQUENCER 50 help 51 Say Y here to enable the dummy sequencer client. This client 52 is a simple MIDI-through client: all normal input events are 53 redirected to the output port immediately. 54 55 You don't need this unless you want to connect many MIDI 56 devices or applications together. 57 58 To compile this driver as a module, choose M here: the module 59 will be called snd-seq-dummy. 60 61config SND_OSSEMUL 62 select SOUND_OSS_CORE 63 bool 64 65config SND_MIXER_OSS 66 tristate "OSS Mixer API" 67 select SND_OSSEMUL 68 help 69 To enable OSS mixer API emulation (/dev/mixer*), say Y here 70 and read <file:Documentation/sound/alsa/OSS-Emulation.txt>. 71 72 Many programs still use the OSS API, so say Y. 73 74 To compile this driver as a module, choose M here: the module 75 will be called snd-mixer-oss. 76 77config SND_PCM_OSS 78 tristate "OSS PCM (digital audio) API" 79 select SND_OSSEMUL 80 select SND_PCM 81 help 82 To enable OSS digital audio (PCM) emulation (/dev/dsp*), say Y 83 here and read <file:Documentation/sound/alsa/OSS-Emulation.txt>. 84 85 Many programs still use the OSS API, so say Y. 86 87 To compile this driver as a module, choose M here: the module 88 will be called snd-pcm-oss. 89 90config SND_PCM_OSS_PLUGINS 91 bool "OSS PCM (digital audio) API - Include plugin system" 92 depends on SND_PCM_OSS 93 default y 94 help 95 If you disable this option, the ALSA's OSS PCM API will not 96 support conversion of channels, formats and rates. It will 97 behave like most of new OSS/Free drivers in 2.4/2.6 kernels. 98 99config SND_PCM_TIMER 100 bool "PCM timer interface" if EXPERT 101 default y 102 help 103 If you disable this option, pcm timer will be unavailable, so 104 those stubs that use pcm timer (e.g. dmix, dsnoop & co) may work 105 incorrectlly. 106 107 For some embedded devices, we may disable it to reduce memory 108 footprint, about 20KB on x86_64 platform. 109 110config SND_SEQUENCER_OSS 111 bool "OSS Sequencer API" 112 depends on SND_SEQUENCER 113 select SND_OSSEMUL 114 help 115 Say Y here to enable OSS sequencer emulation (both 116 /dev/sequencer and /dev/music interfaces). 117 118 Many programs still use the OSS API, so say Y. 119 120 If you choose M in "Sequencer support" (SND_SEQUENCER), 121 this will be compiled as a module. The module will be called 122 snd-seq-oss. 123 124config SND_HRTIMER 125 tristate "HR-timer backend support" 126 depends on HIGH_RES_TIMERS 127 select SND_TIMER 128 help 129 Say Y here to enable HR-timer backend for ALSA timer. ALSA uses 130 the hrtimer as a precise timing source. The ALSA sequencer code 131 also can use this timing source. 132 133 To compile this driver as a module, choose M here: the module 134 will be called snd-hrtimer. 135 136config SND_SEQ_HRTIMER_DEFAULT 137 bool "Use HR-timer as default sequencer timer" 138 depends on SND_HRTIMER && SND_SEQUENCER 139 default y 140 help 141 Say Y here to use the HR-timer backend as the default sequencer 142 timer. 143 144config SND_DYNAMIC_MINORS 145 bool "Dynamic device file minor numbers" 146 help 147 If you say Y here, the minor numbers of ALSA device files in 148 /dev/snd/ are allocated dynamically. This allows you to have 149 more than 8 sound cards, but requires a dynamic device file 150 system like udev. 151 152 If you are unsure about this, say N here. 153 154config SND_MAX_CARDS 155 int "Max number of sound cards" 156 range 4 256 157 default 32 158 depends on SND_DYNAMIC_MINORS 159 help 160 Specify the max number of sound cards that can be assigned 161 on a single machine. 162 163config SND_SUPPORT_OLD_API 164 bool "Support old ALSA API" 165 default y 166 help 167 Say Y here to support the obsolete ALSA PCM API (ver.0.9.0 rc3 168 or older). 169 170config SND_PROC_FS 171 bool "Sound Proc FS Support" if EXPERT 172 depends on PROC_FS 173 default y 174 help 175 Say 'N' to disable Sound proc FS, which may reduce code size about 176 9KB on x86_64 platform. 177 If unsure say Y. 178 179config SND_VERBOSE_PROCFS 180 bool "Verbose procfs contents" 181 depends on SND_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_DMA_SGBUF 225 def_bool y 226 depends on X86 227 228source "sound/core/seq/Kconfig" 229