Sndio sndio is the software layer of the OpenBSD operating system that manages sound cards and MIDI ports. It provides an optional sound server and a documented application programming interface to access either the server or the audio and MIDI hardware in a uniform way.desktop applications , but pays special attention to synchronization mechanisms and reliability required by music applications.Features The audio and MIDI server is the main component of sndio. It aims to fill the gap between programs requirements and the bare hardware as exposed by operating system device drivers . This includes: perform re-sampling and format conversions; for instance to allow a program that requires 44.1 kHz sample frequency to use a device that supports 48 kHz only. mix and route the sound of multiple programs; this allows multiple programs to use the audio device concurrently. split an audio device into sub-devices, for instance allowing one program to use the front speakers and another program to use the rear speakers as they were independent simple stereo devices. allow one program to record what other programs play. control the volume . route audio and MIDI data through the network; this allows programs running on one computer to use the sound card of another computer. route MIDI data between programs, allowing one program to send MIDI data to another program as it was a hardware MIDI port . For instance for a MIDI sequencer to control a soft synthesizer. start, stop and relocate synchronously a group of audio programs allowing multiple small programs to work together. This can be controlled through standard MIDI Machine Control protocol, for instance from within a MIDI sequencer. expose the sound card clock as MIDI timecode , allowing MIDI programs or MIDI hardware to be synchronized to audio streams. History Minimal server capabilities were added to —an audio stream manipulation tool and predecessor to —in October 2008 , shipping with OpenBSD 4.5. In December 2011 , was renamed to and later shipped with OpenBSD 5.1 as the default sound server started at operating system boot .Similar frameworks
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