From 597603d615d2b19a9e451d8cfac24372856a522d Mon Sep 17 00:00:00 2001 From: Jaroslav Kysela Date: Mon, 9 Aug 2010 14:21:11 +0200 Subject: ALSA: introduce the snd-aloop module for the PCM loopback The snd-aloop module allows redirecting of the PCM playback in the kernel back to the user space using the standard ALSA PCM capture API. The module also allows time synchronization with another timing source and notifications of playback stream parameter changes. Signed-off-by: Jaroslav Kysela --- sound/drivers/Kconfig | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) (limited to 'sound/drivers/Kconfig') diff --git a/sound/drivers/Kconfig b/sound/drivers/Kconfig index 84714a65e5c8..b6ae76285255 100644 --- a/sound/drivers/Kconfig +++ b/sound/drivers/Kconfig @@ -74,6 +74,25 @@ config SND_DUMMY To compile this driver as a module, choose M here: the module will be called snd-dummy. +config SND_ALOOP + tristate "Generic loopback driver (PCM)" + select SND_PCM + help + Say 'Y' or 'M' to include support for the PCM loopback device. + This module returns played samples back to the user space using + the standard ALSA PCM device. The devices are routed 0->1 and + 1->0, where first number is the playback PCM device and second + number is the capture device. Module creates two PCM devices and + configured number of substreams (see the pcm_substreams module + parameter). + + The looback device allow time sychronization with an external + timing source using the time shift universal control (+-20% + of system time). + + To compile this driver as a module, choose M here: the module + will be called snd-aloop. + config SND_VIRMIDI tristate "Virtual MIDI soundcard" depends on SND_SEQUENCER -- cgit v1.2.3