Beyond Linux® From Scratch - Version 2015-03-06-multilib

Chapter 39. Multimedia Libraries and Drivers

alsa-plugins-1.0.28

Introduction to ALSA Plugins

The ALSA Plugins package contains plugins for various audio libraries and sound servers.

This package is known to build and work properly using an LFS-7.7 platform.

Package Information

ALSA Plugins Dependencies

Required

alsa-lib-1.0.28

Optional

FFmpeg-2.5.4, JACK, libsamplerate-0.1.8, PulseAudio-5.0 and Speex-1.2rc2

User Notes: http://wiki.linuxfromscratch.org/blfs/wiki/alsa-plugins

Installation of ALSA Plugins

Install ALSA Plugins by running the following commands: 

sed -i "/speex_preprocess/i#include <stdint.h>" speex/pcm_speex.c &&
./configure &&
make

This package does not come with a test suite.

Now, as the root user: 

make install

Command Explanations

sed ... speex/pcm_speex.c: Fix a build problem when speex1.2rc2 is installed.

Contents

Installed Programs: None
Installed Libraries: Numerous libasound_module_<module>.so modules including ctl_oss, ctl_pulse, pcm_a52, pcm_jack, pcm_oss, pcm_pulse, pcm_upmix, pcm_usb_stream, pcm_vdownmix, rate_samplerate* and rate_speexrate*
Installed Directories: None

Short Descriptions

libasound_module_pcm_oss.so

Allows native ALSA applications to run on OSS.

libasound_module_pcm_upmix.so

Allows upmixing sound to 4 or 6 channels.

libasound_module_pcm_vdownmix.so

Allows downmixing sound from 4-6 channels to 2 channel stereo output.

libasound_module_pcm_jack.so

Allows native ALSA applications to work with jackd.

libasound_module_pcm_pulse.so

Allows native ALSA applications to access a PulseAudio sound daemon.

libasound_module_pcm_a52.so

Converts S16 linear sound format to A52 compressed format and sends it to an SPDIF output.

libasound_module_rate_samplerate.so

Provides an external rate converter through libsamplerate.

Last updated on 2015-02-27 19:21:33 -0500