Automatic Audio Routing for Home Entertainment Davide Pesavento, Martina Astegno, Claudio E
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Linux Sound Subsystem Documentation Release 4.13.0-Rc4+
Linux Sound Subsystem Documentation Release 4.13.0-rc4+ The kernel development community Sep 05, 2017 CONTENTS 1 ALSA Kernel API Documentation 1 1.1 The ALSA Driver API ............................................ 1 1.2 Writing an ALSA Driver ........................................... 89 2 Designs and Implementations 145 2.1 Standard ALSA Control Names ...................................... 145 2.2 ALSA PCM channel-mapping API ..................................... 147 2.3 ALSA Compress-Offload API ........................................ 149 2.4 ALSA PCM Timestamping ......................................... 152 2.5 ALSA Jack Controls ............................................. 155 2.6 Tracepoints in ALSA ............................................ 156 2.7 Proc Files of ALSA Drivers ......................................... 158 2.8 Notes on Power-Saving Mode ....................................... 161 2.9 Notes on Kernel OSS-Emulation ..................................... 161 2.10 OSS Sequencer Emulation on ALSA ................................... 165 3 ALSA SoC Layer 171 3.1 ALSA SoC Layer Overview ......................................... 171 3.2 ASoC Codec Class Driver ......................................... 172 3.3 ASoC Digital Audio Interface (DAI) .................................... 174 3.4 Dynamic Audio Power Management for Portable Devices ...................... 175 3.5 ASoC Platform Driver ............................................ 180 3.6 ASoC Machine Driver ............................................ 181 3.7 Audio Pops -
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The GNOME Census: Who writes GNOME? Dave Neary & Vanessa David, Neary Consulting © Neary Consulting 2010: Some rights reserved Table of Contents Introduction.........................................................................................3 What is GNOME?.............................................................................3 Project governance...........................................................................3 Why survey GNOME?.......................................................................4 Scope and methodology...................................................................5 Tools and Observations on Data Quality..........................................7 Results and analysis...........................................................................10 GNOME Project size.......................................................................10 The Long Tail..................................................................................11 Effects of commercialisation..........................................................14 Who does the work?.......................................................................15 Who maintains GNOME?................................................................17 Conclusions........................................................................................22 References.........................................................................................24 Appendix 1: Modules included in survey...........................................25 2 Introduction What -
Features Ask Klaus!
FEATURES Ask Klaus! Klaus Knopper answers your Linux questions Thanks for reading this, Klaus; it really means a lot to me that you take time to help out the Linux community. Mark Mina If I’m not completely mistaken (having no such model for test- ing), the main challenge with this note- AskBy Klaus Knopper Klaus! book really seems to be the graphics Knoppix Install adapter, which is a hybrid Intel + ATI/ Hello, Klaus. I have been using your AMD RadeonHD 6550M. You will most OS version 6.4 as supplied on the likely need a new kernel (at least 2.6.38 DVD with the January 2011 Linux Maga- or 2.6.39) with the Radeon DRM module zine. I like it so much that I would like to and Xorg 1.10 with the xorg-video- install it on the hard drive on one of my radeon driver, which is currently in De- machines. I have looked through the bian/ unstable. This is quite distro-inde- files but cannot find a way to install it. pendent; the most recently released ones Can you please advise? I am not on the will be the best candidates. Internet but hope to be on in the next You may also succeed by switching off couple of months. Best Regards, John one of the graphics chipsets in the BIOS Stirling and explicitly configuring the other in Xorg. The Intel version may be a good A Knoppix harddisk install option candidate. For Knoppix, try to boot with: exists in the Preferences menu with the “0wn” (“zero work needed”) knoppix xmodule=intel utility. -
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. -
Audio on Linux: End of a Golden Age?
Audio on Linux: End of a Golden Age? Lars-Peter Clausen – Analog Devices Agenda ● History – Major transitions in software and hardware architecture ● Present – A look at the current situation – Are we in a golden age? ● Future – What major transitions lie ahead of us – How are we going to react to them? Interdependent vs. Modular Interdependent ● No clear boundaries defined between sub- modules ● Different sub-modules are aware of each others internals – Creates dependencies ● Parts can't be upgraded or modified independently of each other Modular ● Partitioning in sub-modules ● Clearly defined functions and interfaces ● Parts can be changed independently of each other – Drop-in replacements ● Constraint by the interface History Humble Beginnings PC Speaker (Beeper) ● Found in all IBM compatible PCs – Present in the first IBM PC 5150 (1981) ● Has only two states – Toggling a specific frequency generates a tone (PWM) ● Magnetic or Piezoelectric plate ● In Linux supported by the input framework Extending Features Soundblaster ● First widespread consumer sound card – Soundblaster 1.0 release in 1989 ● Primarily synthesizer based ● Mono PCM channel ● Became defacto standard for consumer sound cards – Many applications expected a sound blaster interface – Other manufacturers included a Soundblaster compatibility mode in their hardware Audio on Linux Open Sound System (OSS) Open Sound System (OSS) ● Used to be default audio subsystem in v2.4 ● /dev/dsp interface – To playback audio use write() – To capture audio use read() – Some IOCTLs for -
Minecraft Bedrock Launcher Documentation
Minecraft Bedrock Launcher Documentation MrARM & contributors Jul 27, 2021 Contents: 1 Getting started 1 1.1 AppImage................................................1 1.2 Flatpak..................................................1 1.3 macOS..................................................2 1.4 Source build...............................................2 1.5 Getting help...............................................2 2 Frequently Asked Questions 3 2.1 Do I need to own Minecraft: Pocket Edition to play?..........................3 2.2 Does it work on Windows 7 / 8?.....................................3 2.3 How does it work?............................................4 2.4 Where are my worlds?..........................................4 2.5 Can I use resource packs?........................................4 2.6 Why would I want to use this projects server, instead of the official one?................4 3 Troubleshooting 5 3.1 Extracting APKs.............................................6 3.2 AppImage................................................6 3.3 Controller.................................................6 3.4 Game launcher..............................................7 3.5 Qt launcher UI..............................................9 4 Building from sources 11 4.1 Introduction (read first).......................................... 11 4.2 Compiling MSA (for Xbox Live).................................... 12 4.3 Compiling the game launcher...................................... 13 4.4 Compiling the Qt UI.......................................... -
The Pulseaudio Sound Server Linux.Conf.Au 2007
Introduction What is PulseAudio? Usage Internals Recipes Outlook The PulseAudio Sound Server linux.conf.au 2007 Lennart Poettering [email protected] Universit¨atHamburg, Department Informatik University of Hamburg, Department of Informatics Hamburg, Germany January 17th, 2007 Lennart Poettering The PulseAudio Sound Server 2 What is PulseAudio? 3 Usage 4 Internals 5 Recipes 6 Outlook Introduction What is PulseAudio? Usage Internals Recipes Outlook Contents 1 Introduction Lennart Poettering The PulseAudio Sound Server 3 Usage 4 Internals 5 Recipes 6 Outlook Introduction What is PulseAudio? Usage Internals Recipes Outlook Contents 1 Introduction 2 What is PulseAudio? Lennart Poettering The PulseAudio Sound Server 4 Internals 5 Recipes 6 Outlook Introduction What is PulseAudio? Usage Internals Recipes Outlook Contents 1 Introduction 2 What is PulseAudio? 3 Usage Lennart Poettering The PulseAudio Sound Server 5 Recipes 6 Outlook Introduction What is PulseAudio? Usage Internals Recipes Outlook Contents 1 Introduction 2 What is PulseAudio? 3 Usage 4 Internals Lennart Poettering The PulseAudio Sound Server 6 Outlook Introduction What is PulseAudio? Usage Internals Recipes Outlook Contents 1 Introduction 2 What is PulseAudio? 3 Usage 4 Internals 5 Recipes Lennart Poettering The PulseAudio Sound Server Introduction What is PulseAudio? Usage Internals Recipes Outlook Contents 1 Introduction 2 What is PulseAudio? 3 Usage 4 Internals 5 Recipes 6 Outlook Lennart Poettering The PulseAudio Sound Server Introduction What is PulseAudio? Usage Internals Recipes Outlook Who Am I? Student (Computer Science) from Hamburg, Germany Core Developer of PulseAudio, Avahi and a few other Free Software projects http://0pointer.de/lennart/ [email protected] IRC: mezcalero Lennart Poettering The PulseAudio Sound Server Introduction What is PulseAudio? Usage Internals Recipes Outlook Introduction Lennart Poettering The PulseAudio Sound Server It’s a mess! There are just too many widely adopted but competing and incompatible sound systems. -
Red Hat Enterprise Linux 7 7.8 Release Notes
Red Hat Enterprise Linux 7 7.8 Release Notes Release Notes for Red Hat Enterprise Linux 7.8 Last Updated: 2021-03-02 Red Hat Enterprise Linux 7 7.8 Release Notes Release Notes for Red Hat Enterprise Linux 7.8 Legal Notice Copyright © 2021 Red Hat, Inc. The text of and illustrations in this document are licensed by Red Hat under a Creative Commons Attribution–Share Alike 3.0 Unported license ("CC-BY-SA"). An explanation of CC-BY-SA is available at http://creativecommons.org/licenses/by-sa/3.0/ . In accordance with CC-BY-SA, if you distribute this document or an adaptation of it, you must provide the URL for the original version. Red Hat, as the licensor of this document, waives the right to enforce, and agrees not to assert, Section 4d of CC-BY-SA to the fullest extent permitted by applicable law. Red Hat, Red Hat Enterprise Linux, the Shadowman logo, the Red Hat logo, JBoss, OpenShift, Fedora, the Infinity logo, and RHCE are trademarks of Red Hat, Inc., registered in the United States and other countries. Linux ® is the registered trademark of Linus Torvalds in the United States and other countries. Java ® is a registered trademark of Oracle and/or its affiliates. XFS ® is a trademark of Silicon Graphics International Corp. or its subsidiaries in the United States and/or other countries. MySQL ® is a registered trademark of MySQL AB in the United States, the European Union and other countries. Node.js ® is an official trademark of Joyent. Red Hat is not formally related to or endorsed by the official Joyent Node.js open source or commercial project. -
Debian and Ubuntu
Debian and Ubuntu Lucas Nussbaum lucas@{debian.org,ubuntu.com} lucas@{debian.org,ubuntu.com} Debian and Ubuntu 1 / 28 Why I am qualified to give this talk Debian Developer and Ubuntu Developer since 2006 Involved in improving collaboration between both projects Developed/Initiated : Multidistrotools, ubuntu usertag on the BTS, improvements to the merge process, Ubuntu box on the PTS, Ubuntu column on DDPO, . Attended Debconf and UDS Friends in both communities lucas@{debian.org,ubuntu.com} Debian and Ubuntu 2 / 28 What’s in this talk ? Ubuntu development process, and how it relates to Debian Discussion of the current state of affairs "OK, what should we do now ?" lucas@{debian.org,ubuntu.com} Debian and Ubuntu 3 / 28 The Ubuntu Development Process lucas@{debian.org,ubuntu.com} Debian and Ubuntu 4 / 28 Linux distributions 101 Take software developed by upstream projects Linux, X.org, GNOME, KDE, . Put it all nicely together Standardization / Integration Quality Assurance Support Get all the fame Ubuntu has one special upstream : Debian lucas@{debian.org,ubuntu.com} Debian and Ubuntu 5 / 28 Ubuntu’s upstreams Not that simple : changes required, sometimes Toolchain changes Bugfixes Integration (Launchpad) Newer releases Often not possible to do work in Debian first lucas@{debian.org,ubuntu.com} Debian and Ubuntu 6 / 28 Ubuntu Packages Workflow lucas@{debian.org,ubuntu.com} Debian and Ubuntu 7 / 28 Ubuntu Packages Workflow Ubuntu Karmic Excluding specific packages language-(support|pack)-*, kde-l10n-*, *ubuntu*, *launchpad* Missing 4% : Newer upstream -
Moblin Architecture Overview Linux Foundation – Moblin Seminar
Moblin Architecture Overview Linux Foundation – Moblin Seminar Sunil Saxena Open Source Technology Center Software & Services Group Legal information INFORMATION IN THIS DOCUMENT IS PROVIDED IN CONNECTION WITH INTEL® PRODUCTS. EXCEPT AS PROVIDED IN INTEL'S TERMS AND CONDITIONS OF SALE FOR SUCH PRODUCTS, INTEL ASSUMES NO LIABILITY WHATSOEVER , AND INTEL DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY RELATING TO SALE AND/OR USE OF INTEL PRODUCTS, INCLUDING LIABILITY OR WARRANTIES RELATING TO FITNESS FOR A PARTICULAR PURPOSE,,, MERCHANTABILITY, OR INFRINGEMENT OF ANY PATENT, COPYRIGHT, OR OTHER INTELLECTUAL PROPERTY RIGHT. Intel mayygp,pp,p make changes to specifications, product descriptions, and plans at any time, without notice. All dates provided are subject to change without notice. IliIntel is a tra demar kfIlCk of Intel Corporat iihUSdhion in the U.S. and other countr ies. *Other names and brands may be claimed as the property of others. Copyright © 2007-2009, Intel Corporation . All rights are protected. Linux Foundation – Moblin Seminar 2 2 2 Agenda Moblin Platform Usages Moblin Architecture Overview Summary / Call-to-Action Linux Foundation – Moblin Seminar 3 3 3 MID Platform Usages INFORMATION COMMUNICATION ENTERTAINMENT Social Networking Video, TV, Games EU Genera te d Con ten t Pic tures Directions Blog, IM/Chat Music POI, LBS Voice (VoIP, CSV) Internet Browsing News, Shop, Sports Internet Browsing Internet Browsing Video Conferencing GenY GenY Gen Y Digital Parents Mobile Professionals Digital Parents Mobile Professionals -
The Pipewire Multimedia Framework and Its Potential in AGL George Kiagiadakis, Senior Software Engineer What Is Pipewire
The PipeWire multimedia framework and its potential in AGL George Kiagiadakis, Senior Software Engineer What is PipeWire ● Initial idea: PulseAudio for video ● Now: generic multimedia daemon – Video capture server ● Camera and other video sources (ex. gnome-shell screencast) – PulseAudio and Jack (pro-audio) replacement ● Borrowing ideas also from CoreAudio, AudioFlinger, and others... 2 Architecture 3 Architecture ● Multi-process, graph based processing ● External session/policy management (unlike PulseAudio) – Nothing happens automatically inside the daemon – Per-desktop/distro implementations can exist ● External applications can be device providers ● Real-time ultra low-latency (pro-audio) and standard high latency (typical desktop) 4 Processing Efficiency ● Zero-copy with modern linux kernel APIs (memfd, dmabuf) – Buffers passed around with file descriptors – memfd: shared CPU buffer ● Kernel ensures only the destination process can modify the buffer – dmabuf: shared hardware (GPU/VPU) buffer ● Processing happens in dedicated hardware, the CPU does not need to copy data on the CPU-accessible RAM 6 Processing Efficiency (continued...) ● Plugins based on SPA (Simple Plugin API) – Header-only C library with zero dependencies – Extremely lightweight data structures – “Like GStreamer, but not so heavy!” - Wim Taymans ● Much lower CPU usage than PulseAudio – PulseAudio CPU skyrockets on low latency, even on a powerful i7 – PipeWire CPU will happily stay low at any latency and any load 7 CPU Usage Statistics Playback of a 24bit 96kHz 5.1 -
Third Party Software Notices And/Or Additional Terms and Conditions
Third Party Software Notices and/or Additional Terms and Conditions F20240-501-0240 2019.12.06 This page and/or pages linked from this page contain Third Party Software Notices and/or Additional Terms and Conditions applicable for each Matrox product that may be updated from time to time. It is the responsibility of the Licensee to verify that the agreements listed are current and applicable. Please note that this list is not exhaustive and was determined according to Matrox’s understanding and to the best of its knowledge. Note: Links using the GIT protocol require the use of a GIT tool. For more information, see https://git-scm.com/. Maevex 5100 Series Software Version Software Package Link License Version License Link Apache v2.2.22 http://archive.apache.org/ Apache 2.0 https://www.apache.org/l dist/httpd icenses/LICENSE-2.0 asoundlib (ALSA) v1.0.24.2 http://software- LGPL (Library 2.1 https://www.gnu.org/lice dl.ti.com/dsps/dsps_public General Public nses/old-licenses/lgpl- _sw/ezsdk/latest/index_FD License) 2.1.en.html S.html AutoMapper v3.1.0 https://www.nuget.org/pac MIT No version https://opensource.org/li kages/AutoMapper/ applicable censes/MIT Avahi v0.6.31 http://www.avahi.org/dow LGPL 2.1 https://www.gnu.org/lice nload nses/old-licenses/lgpl- 2.1.en.html Busybox v1.20.2 http://www.busybox.net/d GPL (General 2.0 https://www.gnu.org/lice ownloads Public License) nses/gpl-2.0.en.html Dropbear v0.51 http://matt.ucc.asn.au/dro MIT No version https://opensource.org/li pbear/releases applicable censes/MIT Glib v2.24.2 https://gstreamer.ti.com/gf