11da177e4SLinus Torvalds# ALSA soundcard-configuration 21da177e4SLinus Torvaldsconfig SND_TIMER 31da177e4SLinus Torvalds tristate 41da177e4SLinus Torvalds 51da177e4SLinus Torvaldsconfig SND_PCM 61da177e4SLinus Torvalds tristate 71da177e4SLinus Torvalds select SND_TIMER 81da177e4SLinus Torvalds 91da177e4SLinus Torvaldsconfig SND_HWDEP 101da177e4SLinus Torvalds tristate 111da177e4SLinus Torvalds 121da177e4SLinus Torvaldsconfig SND_RAWMIDI 131da177e4SLinus Torvalds tristate 141da177e4SLinus Torvalds 151da177e4SLinus Torvaldsconfig SND_SEQUENCER 161da177e4SLinus Torvalds tristate "Sequencer support" 171da177e4SLinus Torvalds select SND_TIMER 181da177e4SLinus Torvalds help 191da177e4SLinus Torvalds Say Y or M to enable MIDI sequencer and router support. This 201da177e4SLinus Torvalds feature allows routing and enqueueing of MIDI events. Events 211da177e4SLinus Torvalds can be processed at a given time. 221da177e4SLinus Torvalds 231da177e4SLinus Torvalds Many programs require this feature, so you should enable it 241da177e4SLinus Torvalds unless you know what you're doing. 251da177e4SLinus Torvalds 261da177e4SLinus Torvaldsconfig SND_SEQ_DUMMY 271da177e4SLinus Torvalds tristate "Sequencer dummy client" 281da177e4SLinus Torvalds depends on SND_SEQUENCER 291da177e4SLinus Torvalds help 301da177e4SLinus Torvalds Say Y here to enable the dummy sequencer client. This client 311da177e4SLinus Torvalds is a simple MIDI-through client: all normal input events are 321da177e4SLinus Torvalds redirected to the output port immediately. 331da177e4SLinus Torvalds 341da177e4SLinus Torvalds You don't need this unless you want to connect many MIDI 351da177e4SLinus Torvalds devices or applications together. 361da177e4SLinus Torvalds 371da177e4SLinus Torvalds To compile this driver as a module, choose M here: the module 381da177e4SLinus Torvalds will be called snd-seq-dummy. 391da177e4SLinus Torvalds 401da177e4SLinus Torvaldsconfig SND_OSSEMUL 411da177e4SLinus Torvalds bool 421da177e4SLinus Torvalds 431da177e4SLinus Torvaldsconfig SND_MIXER_OSS 441da177e4SLinus Torvalds tristate "OSS Mixer API" 451da177e4SLinus Torvalds select SND_OSSEMUL 461da177e4SLinus Torvalds help 471da177e4SLinus Torvalds To enable OSS mixer API emulation (/dev/mixer*), say Y here 481da177e4SLinus Torvalds and read <file:Documentation/sound/alsa/OSS-Emulation.txt>. 491da177e4SLinus Torvalds 501da177e4SLinus Torvalds Many programs still use the OSS API, so say Y. 511da177e4SLinus Torvalds 521da177e4SLinus Torvalds To compile this driver as a module, choose M here: the module 531da177e4SLinus Torvalds will be called snd-mixer-oss. 541da177e4SLinus Torvalds 551da177e4SLinus Torvaldsconfig SND_PCM_OSS 561da177e4SLinus Torvalds tristate "OSS PCM (digital audio) API" 571da177e4SLinus Torvalds select SND_OSSEMUL 581da177e4SLinus Torvalds select SND_PCM 591da177e4SLinus Torvalds help 601da177e4SLinus Torvalds To enable OSS digital audio (PCM) emulation (/dev/dsp*), say Y 611da177e4SLinus Torvalds here and read <file:Documentation/sound/alsa/OSS-Emulation.txt>. 621da177e4SLinus Torvalds 631da177e4SLinus Torvalds Many programs still use the OSS API, so say Y. 641da177e4SLinus Torvalds 651da177e4SLinus Torvalds To compile this driver as a module, choose M here: the module 661da177e4SLinus Torvalds will be called snd-pcm-oss. 671da177e4SLinus Torvalds 6821a3479aSJaroslav Kyselaconfig SND_PCM_OSS_PLUGINS 6921a3479aSJaroslav Kysela bool "OSS PCM (digital audio) API - Include plugin system" 7021a3479aSJaroslav Kysela depends on SND_PCM_OSS 7121a3479aSJaroslav Kysela default y 7221a3479aSJaroslav Kysela help 7321a3479aSJaroslav Kysela If you disable this option, the ALSA's OSS PCM API will not 7421a3479aSJaroslav Kysela support conversion of channels, formats and rates. It will 7521a3479aSJaroslav Kysela behave like most of new OSS/Free drivers in 2.4/2.6 kernels. 7621a3479aSJaroslav Kysela 771da177e4SLinus Torvaldsconfig SND_SEQUENCER_OSS 781da177e4SLinus Torvalds bool "OSS Sequencer API" 7989fe5117STakashi Iwai depends on SND_SEQUENCER 801da177e4SLinus Torvalds select SND_OSSEMUL 811da177e4SLinus Torvalds help 821da177e4SLinus Torvalds Say Y here to enable OSS sequencer emulation (both 831da177e4SLinus Torvalds /dev/sequencer and /dev/music interfaces). 841da177e4SLinus Torvalds 851da177e4SLinus Torvalds Many programs still use the OSS API, so say Y. 861da177e4SLinus Torvalds 87c2f60c52SFrederik Deweerdt If you choose M in "Sequencer support" (SND_SEQUENCER), 88c2f60c52SFrederik Deweerdt this will be compiled as a module. The module will be called 89c2f60c52SFrederik Deweerdt snd-seq-oss. 901da177e4SLinus Torvalds 911da177e4SLinus Torvaldsconfig SND_RTCTIMER 921da177e4SLinus Torvalds tristate "RTC Timer support" 9389fe5117STakashi Iwai depends on RTC 941da177e4SLinus Torvalds select SND_TIMER 951da177e4SLinus Torvalds help 961da177e4SLinus Torvalds Say Y here to enable RTC timer support for ALSA. ALSA uses 971da177e4SLinus Torvalds the RTC timer as a precise timing source and maps the RTC 981da177e4SLinus Torvalds timer to ALSA's timer interface. The ALSA sequencer code also 991da177e4SLinus Torvalds can use this timing source. 1001da177e4SLinus Torvalds 1011da177e4SLinus Torvalds To compile this driver as a module, choose M here: the module 1021da177e4SLinus Torvalds will be called snd-rtctimer. 1031da177e4SLinus Torvalds 104a4f508b2SClemens Ladischconfig SND_SEQ_RTCTIMER_DEFAULT 105a4f508b2SClemens Ladisch bool "Use RTC as default sequencer timer" 106a4f508b2SClemens Ladisch depends on SND_RTCTIMER && SND_SEQUENCER 107a4f508b2SClemens Ladisch default y 108a4f508b2SClemens Ladisch help 109a4f508b2SClemens Ladisch Say Y here to use the RTC timer as the default sequencer 110a4f508b2SClemens Ladisch timer. This is strongly recommended because it ensures 111a4f508b2SClemens Ladisch precise MIDI timing even when the system timer runs at less 112a4f508b2SClemens Ladisch than 1000 Hz. 113a4f508b2SClemens Ladisch 114a4f508b2SClemens Ladisch If in doubt, say Y. 115a4f508b2SClemens Ladisch 116332682b1SClemens Ladischconfig SND_DYNAMIC_MINORS 117b10e5391SClemens Ladisch bool "Dynamic device file minor numbers" 118332682b1SClemens Ladisch help 119332682b1SClemens Ladisch If you say Y here, the minor numbers of ALSA device files in 120332682b1SClemens Ladisch /dev/snd/ are allocated dynamically. This allows you to have 121332682b1SClemens Ladisch more than 8 sound cards, but requires a dynamic device file 122332682b1SClemens Ladisch system like udev. 123332682b1SClemens Ladisch 124332682b1SClemens Ladisch If you are unsure about this, say N here. 125332682b1SClemens Ladisch 12659d48582STakashi Iwaiconfig SND_SUPPORT_OLD_API 12759d48582STakashi Iwai bool "Support old ALSA API" 12859d48582STakashi Iwai default y 12959d48582STakashi Iwai help 13059d48582STakashi Iwai Say Y here to support the obsolete ALSA PCM API (ver.0.9.0 rc3 13159d48582STakashi Iwai or older). 13259d48582STakashi Iwai 13321a3479aSJaroslav Kyselaconfig SND_VERBOSE_PROCFS 13421a3479aSJaroslav Kysela bool "Verbose procfs contents" 13589fe5117STakashi Iwai depends on PROC_FS 13621a3479aSJaroslav Kysela default y 13721a3479aSJaroslav Kysela help 13821a3479aSJaroslav Kysela Say Y here to include code for verbose procfs contents (provides 139a982ac06SMatt LaPlante useful information to developers when a problem occurs). On the 14021a3479aSJaroslav Kysela other side, it makes the ALSA subsystem larger. 14121a3479aSJaroslav Kysela 1421da177e4SLinus Torvaldsconfig SND_VERBOSE_PRINTK 1431da177e4SLinus Torvalds bool "Verbose printk" 1441da177e4SLinus Torvalds help 1451da177e4SLinus Torvalds Say Y here to enable verbose log messages. These messages 1461da177e4SLinus Torvalds will help to identify source file and position containing 1471da177e4SLinus Torvalds printed messages. 1481da177e4SLinus Torvalds 1491da177e4SLinus Torvalds You don't need this unless you're debugging ALSA. 1501da177e4SLinus Torvalds 1511da177e4SLinus Torvaldsconfig SND_DEBUG 1521da177e4SLinus Torvalds bool "Debug" 1531da177e4SLinus Torvalds help 1541da177e4SLinus Torvalds Say Y here to enable ALSA debug code. 1551da177e4SLinus Torvalds 1561da177e4SLinus Torvaldsconfig SND_DEBUG_DETECT 1571da177e4SLinus Torvalds bool "Debug detection" 1581da177e4SLinus Torvalds depends on SND_DEBUG 1591da177e4SLinus Torvalds help 1601da177e4SLinus Torvalds Say Y here to enable extra-verbose log messages printed when 1611da177e4SLinus Torvalds detecting devices. 16261fb63c0SJaroslav Kysela 16361fb63c0SJaroslav Kyselaconfig SND_PCM_XRUN_DEBUG 16461fb63c0SJaroslav Kysela bool "Enable PCM ring buffer overrun/underrun debugging" 16561fb63c0SJaroslav Kysela default n 166b7d90a35STakashi Iwai depends on SND_DEBUG && SND_VERBOSE_PROCFS 16761fb63c0SJaroslav Kysela help 16861fb63c0SJaroslav Kysela Say Y to enable the PCM ring buffer overrun/underrun debugging. 16961fb63c0SJaroslav Kysela It is usually not required, but if you have trouble with 17061fb63c0SJaroslav Kysela sound clicking when system is loaded, it may help to determine 17161fb63c0SJaroslav Kysela the process or driver which causes the scheduling gaps. 172e922b002STakashi Iwai 173e922b002STakashi Iwaiconfig SND_VMASTER 174e922b002STakashi Iwai bool 175