A Sound Server for DROPS
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
Pipewire: a Low-Level Multimedia Subsystem
Proceedings of the 18th Linux Audio Conference (LAC-20), SCRIME, Université de Bordeaux, France, November 25–27, 2020 PIPEWIRE: A LOW-LEVEL MULTIMEDIA SUBSYSTEM Wim Taymans ∗ Principal Software Engineer Red Hat, Spain [email protected] ABSTRACT 2. LINUX AUDIO LANDSCAPE PipeWire is a low-level multimedia library and daemon that facili- Audio support on Linux first appeared with the Open Sound System tates negotiation and low-latency transport of multimedia content be- (OSS) [6] and was until the 2.4 kernel the only audio API available tween applications, filters and devices. It is built using modern Linux on Linux. It was based around the standard Unix open/close/read- infrastructure and has both performance and security as its core de- /write/ioctl system calls. sign guidelines. The goal is to provide services such as JACK and OSS was replaced by the Advanced Linux Sound Architecture PulseAudio on top of this common infrastructure. PipeWire is media (ALSA) [7]from Linux 2.5. ALSA improved on the OSS API and agnostic and supports arbitrary compressed and uncompressed for- included a user space library that abstracted many of the hardware mats. A common audio infrastructure with backwards compatibility details. The ALSA user-space library also includes a plugin infras- that can support Pro Audio and Desktop Audio use cases can poten- tructure that can be used to create new custom devices and plugins. tially unify the currently fractured audio landscape on Linux desk- Unfortunately, the plugin system is quite static and requires editing tops and workstations and give users and developers a much better of configuration files. -
Volume 2 – Vidéo Sous Linux
Volume 2 – Vidéo sous linux Installation des outils vidéo V6.3 du 20 mars 2020 Par Olivier Hoarau ([email protected]) Vidéo sous linux Volume 1 - Installation des outils vidéo Volume 2 - Tutoriel Kdenlive Volume 3 - Tutoriel cinelerra Volume 4 - Tutoriel OpenShot Video Editor Volume 5 - Tutoriel LiVES Table des matières 1 HISTORIQUE DU DOCUMENT................................................................................................................................4 2 PRÉAMBULE ET LICENCE......................................................................................................................................4 3 PRÉSENTATION ET AVERTISSEMENT................................................................................................................5 4 DÉFINITIONS ET AUTRES NOTIONS VIDÉO......................................................................................................6 4.1 CONTENEUR................................................................................................................................................................6 4.2 CODEC.......................................................................................................................................................................6 5 LES OUTILS DE BASE POUR LA VIDÉO...............................................................................................................7 5.1 PRÉSENTATION.............................................................................................................................................................7 -
User Space Approach to Audio Device Driving on UNIX-Like Systems
Universitat Politecnica` de Catalunya Final year project User space approach to audio device driving on UNIX-like systems Author: Advisor: Robert Millan Hernandez Dr. J.R. Herrero Zaragoza January 17, 2015 Acknowledgements To my advisor, Dr. J.R. Herrero Zaragoza, for his teachings and guidance, for steering me in the right direction at each turning point, and overall for his generous support during development of this project. To Dr. Ferran Sabat´efor his supervision during the management course, his atten- tion to detail, his many corrections and improvements and his feedback on management aspects of the project. To Daniel Ruiz Mu~noz,for LATEX advice and allowing me to peek at some of his templates. 1 Abstract The proposed project attempts to resolve some of the inconvenience factors related to implementing device drivers in kernel space, by using a different approach. With the goals of simplifying development efforts and of maximizing perfor- mance, design decisions have been taken in the majority of UNIX-like operating systems to implement their kernels using a monolithic design and to build most device driver subsystems into them. This has a number of drawbacks which this proposal document will elaborate on. The proposed project will attempt to resolve these drawbacks by implementing a driver framework entirely in user space. The proposal is to do this specifically for sound devices because this appears to be a very suitable class of drivers for this kind of experiment. Abstract (Catalan) El projecte que proposem pret´enresoldre alguns dels inconvenients relacionats amb la implementaci´ode controladors de dispositiu en espai de kernel, tot emprant un m`etode diferent. -
Name Description
SoX(7) Sound eXchange SoX(7) NAME SoX − Sound eXchange, the Swiss Army knife of audio manipulation DESCRIPTION This manual describes SoX supported file formats and audio device types; the SoX manual set starts with sox(1). Format types that can SoX can determine by a filename extension are listed with their names preceded by a dot. Format types that are optionally built into SoX are marked ‘(optional)’. Format types that can be handled by an external library via an optional pseudo file type (currently sndfile) are marked e.g. ‘(also with −t sndfile)’. This might be useful if you have a file that doesn’twork with SoX’sdefault format readers and writers, and there’sanexternal reader or writer for that format. To see if SoX has support for an optional format or device, enter sox −h and look for its name under the list: ‘AUDIO FILE FORMATS’ or ‘AUDIO DEVICE DRIVERS’. SOXFORMATS & DEVICE DRIVERS .raw (also with −t sndfile), .f32, .f64, .s8, .s16, .s24, .s32, .u8, .u16, .u24, .u32, .ul, .al, .lu, .la Raw(headerless) audio files. For raw,the sample rate and the data encoding must be givenusing command-line format options; for the other listed types, the sample rate defaults to 8kHz (but may be overridden), and the data encoding is defined by the givensuffix. Thus f32 and f64 indicate files encoded as 32 and 64-bit (IEEE single and double precision) floating point PCM respectively; s8, s16, s24,and s32 indicate 8, 16, 24, and 32-bit signed integer PCM respectively; u8, u16, u24, and u32 indicate 8, 16, 24, and 32-bit unsigned integer PCM respectively; ul indicates ‘µ-law’ (8-bit), al indicates ‘A-law’ (8-bit), and lu and la are inverse bit order ‘µ-law’ and inverse bit order ‘A-law’ respectively.For all rawformats, the number of channels defaults to 1 (but may be over- ridden). -
Roaraudio Manual
RoarAudio Manual Philipp ”ph3-der-loewe” Schafft et al. August 13, 2010 Contents Contens 6 I Introduction 7 1 What is RoarAudio? 8 1.1 What is a Sound Server? ....................... 8 1.2 What are the key fatures of RoarAudio? .............. 8 2 Basic concept 10 II Quickstart 11 3 Installation 12 3.1 archlinux ............................... 12 3.2 OpenBSD ............................... 13 3.3 Debian ................................. 13 3.4 From Sources ............................. 14 4 Configuring 15 4.1 archlinux ............................... 15 4.2 OpenBSD ............................... 15 4.3 Debian ................................. 15 4.3.1 Options ............................ 15 5 Setting up a player 17 5.1 XMMS ................................. 17 5.2 libao based .............................. 17 5.3 Other ................................. 17 III User Manual 18 6 RoarAudio’s Architecture 19 6.1 Subsystems .............................. 19 6.2 Clients ................................. 19 6.3 Streams ................................ 19 6.3.1 Stream Types ......................... 20 6.3.2 Stream Flags ......................... 22 1 CONTENTS 2 6.4 Driver ................................. 24 6.5 Sources ................................ 24 6.6 Codecfilter ............................... 24 6.7 Bridges ................................ 24 7 Playing music on command lion with RoarAudio 25 7.1 roarcatplay .............................. 25 7.2 roarvorbis ............................... 25 7.3 roarradio .............................. -
A Media Player
mpv a media player Copyright: GPLv2+ Manual 1 section: Manual group: multimedia Table of Contents SYNOPSIS 6 DESCRIPTION 7 INTERACTIVE CONTROL 8 Keyboard Control 8 Mouse Control 11 USAGE 12 Legacy option syntax 12 Escaping spaces and other special characters 12 Paths 13 Per-File Options 14 List Options 14 String list and path list options 14 Key/value list options 15 Filter options 15 General 16 CONFIGURATION FILES 17 Location and Syntax 17 Escaping spaces and special characters 17 Putting Command Line Options into the Configuration File 17 File-specific Configuration Files 17 Profiles 18 Runtime profiles 18 Conditional auto profiles 19 Legacy auto profiles 21 Using mpv from other programs or scripts 23 TAKING SCREENSHOTS 24 TERMINAL STATUS LINE 25 LOW LATENCY PLAYBACK 26 PROTOCOLS 27 PSEUDO GUI MODE 30 Linux desktop issues 31 Disabling Screensaver 31 OPTIONS 32 Track Selection 32 Playback Control 34 Program Behavior 42 Video 47 Audio 58 Subtitles 65 Window 77 Disc Devices 84 Equalizer 86 Demuxer 86 Input 91 OSD 94 Screenshot 97 Software Scaler 99 Audio Resampler 101 Terminal 101 Cache 103 Network 106 DVB 107 ALSA audio output options 108 GPU renderer options 109 Miscellaneous 132 Debugging 137 AUDIO OUTPUT DRIVERS 139 VIDEO OUTPUT DRIVERS 143 AUDIO FILTERS 154 VIDEO FILTERS 158 ENCODING 171 COMMAND INTERFACE 174 input.conf 174 input.conf syntax 174 Key names 175 Flat command syntax 176 Commands specified as arrays 176 Named arguments 177 List of Input Commands 177 Input Commands that are Possibly Subject to Change 186 List of events 194 Hooks 197 Input Command Prefixes 198 Synchronous vs. -
Audio in Embedded Linux Systems
Audio in embedded Linux systems Audio in embedded Linux systems Michael Opdenacker Free Electrons http://free-electrons.com Created with OpenOffice.org 2.0 Audio in embedded Linux systems Copyright 2005, Michael Opdenacker Creative Commons Attribution-ShareAlike 2.0 license http://free-electrons.com/ Sep 21, 2005 1 Rights to copy Attribution ± ShareAlike 2.0 © Copyright 2004-2005 You are free Michael Opdenacker to copy, distribute, display, and perform the work [email protected] to make derivative works to make commercial use of the work Document sources, updates and translations: Under the following conditions http://free-electrons.com/training/audio Attribution. You must give the original author credit. Corrections, suggestions, contributions and Share Alike. If you alter, transform, or build upon this work, you may distribute the resulting work only under a license translations are welcome! identical to this one. For any reuse or distribution, you must make clear to others the license terms of this work. Any of these conditions can be waived if you get permission from the copyright holder. Your fair use and other rights are in no way affected by the above. License text: http://creativecommons.org/licenses/by-sa/2.0/legalcode Audio in embedded Linux systems Copyright 2005, Michael Opdenacker Creative Commons Attribution-ShareAlike 2.0 license http://free-electrons.com/ Sep 21, 2005 2 Best viewed with... This document is best viewed with a recent PDF reader or with OpenOffice.org itself! Take advantage of internal or external -
Audio in Embedded Linux Systems
Audio in embedded Linux systems Audio in embedded Linux systems Free Electrons 1 Free Electrons. Kernel, drivers and embedded Linux development, consulting, training and support. http//free-electrons.com Rights to copy © Copyright 2004-2009, Free Electrons [email protected] Document sources, updates and translations: http://free-electrons.com/docs/audio Corrections, suggestions, contributions and translations are welcome! Attribution ± ShareAlike 3.0 Latest update: Sep 15, 2009 You are free to copy, distribute, display, and perform the work to make derivative works to make commercial use of the work Under the following conditions Attribution. You must give the original author credit. Share Alike. If you alter, transform, or build upon this work, you may distribute the resulting work only under a license identical to this one. For any reuse or distribution, you must make clear to others the license terms of this work. Any of these conditions can be waived if you get permission from the copyright holder. Your fair use and other rights are in no way affected by the above. License text: http://creativecommons.org/licenses/by-sa/3.0/legalcode 2 Free Electrons. Kernel, drivers and embedded Linux development, consulting, training and support. http//free-electrons.com Scope of this training Audio in embedded Linux systems This training targets the development of audio-capable embedded Linux systems. Though it can be useful to playing or creating sound on GNU/Linux desktops, it is not meant to cover everything about audio on GNU/Linux. Linux 2.6 This training only targets new systems based on the Linux 2.6 kernel. -
A Media Player
mpv a media player Copyright: GPLv2+ Manual 1 section: Manual group: multimedia Table of Contents SYNOPSIS 6 DESCRIPTION 7 INTERACTIVE CONTROL 8 Keyboard Control 8 Mouse Control 11 USAGE 12 Legacy option syntax 12 Escaping spaces and other special characters 12 Paths 13 Per-File Options 13 List Options 14 Playing DVDs 15 CONFIGURATION FILES 16 Location and Syntax 16 Escaping spaces and special characters 16 Putting Command Line Options into the Configuration File 16 File-specific Configuration Files 16 Profiles 17 Auto profiles 17 TAKING SCREENSHOTS 19 TERMINAL STATUS LINE 20 LOW LATENCY PLAYBACK 21 PROTOCOLS 22 PSEUDO GUI MODE 24 OPTIONS 25 Track Selection 25 Playback Control 26 Program Behavior 30 Video 34 Audio 43 Subtitles 50 Window 60 Disc Devices 67 Equalizer 68 Demuxer 69 Input 73 OSD 74 Screenshot 77 Software Scaler 80 Audio Resampler 80 Terminal 81 TV 82 Cache 85 Network 87 DVB 89 ALSA audio output options 89 GPU renderer options 90 Miscellaneous 109 AUDIO OUTPUT DRIVERS 114 VIDEO OUTPUT DRIVERS 118 AUDIO FILTERS 127 VIDEO FILTERS 132 ENCODING 142 COMMAND INTERFACE 144 input.conf 144 General Input Command Syntax 144 List of Input Commands 145 Input Commands that are Possibly Subject to Change 150 Hooks 154 Legacy hook API 155 Input Command Prefixes 156 Input Sections 156 Properties 157 Property list 157 Inconsistencies between options and properties 176 Property Expansion 177 Raw and Formatted Properties 178 ON SCREEN CONTROLLER 179 Using the OSC 179 The Interface 179 Key Bindings 180 Configuration 180 Config Syntax 180 Command-line -
Making Sense of the Audio Stack on Unix
Making Sense of The Audio Stack On Unix Patrick Louis 2021-02-07 Published online on venam.nixers.net © Patrick Louis 2021 This publication is in copyright. Subject to statutory exception and to the provision of relevant collective licensing agreements, no reproduction of any part may take place without the written permission of the rightful author. First published eBook format 2021 The author has no responsibility for the persistence or accuracy of urls for external or third-party internet websites referred to in this publication, and does not guarantee that any content on such websites is, or will remain, accurate or appropriate. Contents Introduction 4 Hardware layer 6 Analog to Digital & Digital to Analog (ADC & DAC) 7 Libraries 10 Audio Driver 11 Advanced Linux Sound Architecture (ALSA) 15 Open Sound System (OSS) and SADA 22 Sound Servers 25 sndio 26 aRts (analog Real time synthesizer) and ESD or ESounD (Enlight- ened Sound Daemon) 28 PulseAudio 29 PulseAudio — What Is It? ........................ 29 Pulseaudio — Overall Design ....................... 30 Pulseaudio — Sink, Sink Input, Source, and Source Input ....... 32 Pulseaudio — Internal Concepts: Cards, Card Profile, Device Port, Device ................................. 34 Pulseaudio — Everything Is A Module Thinking ............ 35 Pulseaudio — Startup Process And Configuration ........... 36 Pulseaudio — Interesting Modules And Features ............ 38 Pulseaudio — Tools ............................ 40 Pulseaudio — Suspending ......................... 41 JACK 42 PipeWire 45 Conclusion 53 Bibliography 55 3 Introduction Come see my magical gramophone Audio on Unix is a little zoo, there are so many acronyms for projects and APIs that it’s easy to get lost. Let’s tackle that issue! Most articles are confusing because they either use audio technical jargon, or because they barely scratch the surface and leave people clueless. -
Cleaning up the Linux Desktop Audio Mess
Cleaning up the Linux Desktop Audio Mess Lennart Poettering Red Hat, Inc. [email protected] Abstract audio processing and network transparency in an exten- sible desktop sound server. PulseAudio is now part of Desktop audio on Linux is a mess. There are just too many distributions, and is likely to become the default many competing, incompatible sound systems around. sound system on Fedora and Ubuntu desktops in the Most current audio applications have to support every next releases of these distributions. sound system in parallel and thus ship with sound ab- straction layers with a more or less large number of The talk will mostly focus on the user-space side of back-end plug-ins. JACK clients are incompatible with Linux audio, specifically on the low-level interface be- ALSA clients, which in turn are incompatible with OSS tween hardware drivers and user-space applications. clients, which in turn are incompatible with ESD clients, and so on. “Incompatible” often means “exclusive;” e.g., if an OSS application gets access to the audio hard- 2 Current State of Linux Audio ware, all ALSA applications cannot access it. The current state of audio on Linux and other Free Soft- Apple MacOS X has CoreAudio, Microsoft Windows ware desktops is quite positive in some areas, but in XP has a new user-space audio layer; both manage to many other areas, it is unfortunately very poor. Several provide comprehensive APIs that make almost every competing audio systems and APIs are available. How- user happy, ranging from desktop users to pro audio ever, none of them is useful in all types of applications, people. -
Debian-Reference.En.Pdf
Debian Reference i Debian Reference Osamu Aoki Debian Reference ii Copyright © 2013-2021 Osamu Aoki This Debian Reference (version 2.85) (2021-09-17 09:11:56 UTC) is intended to provide a broad overview of the Debian system as a post-installation user’s guide. It covers many aspects of system administration through shell-command examples for non- developers. Debian Reference iii COLLABORATORS TITLE : Debian Reference ACTION NAME DATE SIGNATURE WRITTEN BY Osamu Aoki September 17, 2021 REVISION HISTORY NUMBER DATE DESCRIPTION NAME Debian Reference iv Contents 1 GNU/Linux tutorials 1 1.1 Console basics .................................................... 1 1.1.1 The shell prompt ............................................... 1 1.1.2 The shell prompt under GUI ......................................... 2 1.1.3 The root account ............................................... 2 1.1.4 The root shell prompt ............................................. 3 1.1.5 GUI system administration tools ....................................... 3 1.1.6 Virtual consoles ................................................ 3 1.1.7 How to leave the command prompt ..................................... 3 1.1.8 How to shutdown the system ......................................... 4 1.1.9 Recovering a sane console .......................................... 4 1.1.10 Additional package suggestions for the newbie ............................... 4 1.1.11 An extra user account ............................................. 5 1.1.12 sudo configuration .............................................