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OSS both as API and as software has been criticized by some developers, such as Paul Davis (of JACK Audio Connection Kit) and Lennart Poettering (of competing PulseAudio). Similarly, there was an ALSA emulation mode in the Linux implementation of OSS. 4Front continued to develop OSS outside the Linux kernel.ĪLSA provides an optional OSS emulation mode that appears to programs as if it were OSS. ALSA was added starting with 2.5, and in those versions, Linux kernel authors marked OSS as deprecated.
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OSS was the only audio API in Linux up through the 2.4 series of official () Linux kernels. ALSA is available for Linux only, and as there is only one implementation of the ALSA interface, ALSA refers equally to that implementation and to the interface itself. One is OSS the other is ALSA ( Advanced Linux Sound Architecture). In the Linux kernel, there have historically been two uniform sound APIs used. Unlike the OSS, it is shareware.ĤFront OSS3D was later renamed to Joesoft Hear. It is ported to Windows and Linux platforms. Supported players include Winamp, Windows Media Player (9 or later), musicmatch, Sonique, Foobar2000, JetAudio, XMMS. OSS/3D is a plugin for music players, which acts as an audio postprocessing engine. It combines the OSS4 framework (audio and mixer) together with Sun's earlier SADA(/dev/audio) API. Solaris and OpenSolaris uses a fork of OSS4 called Boomer. NetBSD and OpenBSD support a compatibility mode for the OSS API, by providing the soundcard.h header file and the libossaudio library, which internally operate using the native Sun-like audio interface. Other implementations įreeBSD contains an independently developed implementation of the OSS API, which includes, among other things, in-kernel resampling, mixing (vchans), equalizer, surround sound, and independent volume control for each application. In January 2008, 4Front Technologies released OSS for FreeBSD (and other BSD systems) under the BSD License. In July 2007, 4Front Technologies released sources for OSS under CDDL for OpenSolaris and GPL for Linux. In spite of this, several operating systems, such as FreeBSD, continued to distribute previous versions of OSS, and continue to maintain and improve these versions. In response, eventually the Linux community abandoned the OSS/free implementation included in the kernel and development effort switched to the replacement Advanced Linux Sound Architecture (ALSA).Some Linux distributions, such as Ubuntu, have chosen to disable OSS support in their kernels and ignore any bugs filed against OSS4 packages (although OSS support may be re-enabled on Ubuntu ). The project was initially free software, but following the project's success, Savolainen was contracted by the company 4Front Technologies and made his support for newer sound devices and improvements proprietary. Examples using the shell: Free, proprietary, free For instance, the default device for sound input and output is /dev/dsp. The API is designed to use the traditional Unix framework of open(), read(), write(), and ioctl(), via special devices.
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OSS was created by Hannu Savolainen and is distributed under four license options, three of which are free software licences, thus making OSS free software. The goal of OSS is to allow the writing of sound-based applications that are agnostic of the underlying sound hardware.
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The term also sometimes refers to the software in a Unix kernel that provides the OSS interface it can be thought of as a device driver (or a collection of device drivers) for sound controller hardware. It is based on standard Unix devicessystem calls (i.e.
The Open Sound System (OSS) is an interface for making and capturing sound in Unix and Unix-like operating systems. Interactions between different parts of Linux sound output stack
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