Mjukvaruutveckling

- inom ljudområdet

Jonas Ekeroot, Sveriges Radio, Teknisk Utveckling

Språktyper

 Systemprogrammeringsspråk (C,C++)

 Skriptspråk (Tcl/Tk + Snack)

 Grafisk/Visuell programmering (jMax, Pd, Max/MSP)

jMax

 IRCAM (Institut de Recherche et Coordination Acoustique/Musique)

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audio SW

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audio SW

audio HW

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audio SW

driver audio HW

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audio SW audio API driver audio HW

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audio SW audio API driver audio HW

 API (Application Programming Interface)

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audio SW audio API MME, DS, ASIO, SoundMgr, CoreAudio, driver OSS, ALSA audio HW

 API (Application Programming Interface)

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plug-in

audio SW audio API MME, DS, ASIO, SoundMgr, CoreAudio, OSS, ALSA driver audio HW

 API (Application Programming Interface)

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plug-in plug-in API audio SW audio API MME, DS, ASIO, SoundMgr, CoreAudio, driver OSS, ALSA audio HW

 API (Application Programming Interface)

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plug-in VST, DirectX, MAS, TDM, plug-in API AS/RTAS/HTDM, LADSPA, AudioUnits audio SW audio API MME, DS, ASIO, SoundMgr, CoreAudio, driver OSS, ALSA audio HW

 API (Application Programming Interface)

Audio API:er – Windows

 MME (MultiMedia Extensions)  DS (DirectSound)

 ASIO (Audio Stream Input/Output)

6 Audio API:er – Mac

 Sound Manager - MacOS 8/9  Core Audio - MacOS X

 ASIO (Audio Stream Input/Output)

Audio API:er – Linux / Unix

 OSS (Open Sound System)

 ALSA (Advanced Linux Sound Architecture)

Plug-in API:er / Plug-in-format

 VST (Virtual Studio Technology)

 DirectX

 MAS (Mark of the Unicorn Audio System)

7 Plug-in API:er / Plug-in-format

 TDM (Time Division Multiplexing)

 AS (Audio Suite)  RTAS (Real-Time Audio Suite)  HTDM (Host Time Division Multiplexing)

Plug-in API:er / Plug-in-format

 LADSPA (Linux Audio Developer’s Simple Plug-in API)

 AU (Audio Units)

Plug-in-programmering

 C-uppsats i ljudteknik

 ”Implementing a parametric EQ plug-in in C++ using the multi-platform VST specification”

 http://epubl.luth.se/1402-1773/2003/044/

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plug-in VST, DirectX, MAS, TDM, plug-in API AS/RTAS/HTDM, LADSPA, AudioUnits audio SW audio API MME, DS, ASIO, SoundMgr, CoreAudio, driver OSS, ALSA audio HW

 API (Application Programming Interface)

Latency

 ”Audio Latency Measurements of Desktop Operating Systems” (2001)

 MacMillan, Droettboom och Fujinaga  Johns Hopkins University

 ICMC (International Computer Music Conference)

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audio SW audio API MME, DS, ASIO, SoundMgr, CoreAudio, driver OSS, ALSA audio HW

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audio SW

audio API MME, DS, ASIO, SoundMgr, CoreAudio, driver OSS, ALSA audio HW

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audio SW PortAudio audio API MME, DS, ASIO, SoundMgr, CoreAudio, OSS, ALSA driver audio HW

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cross-platform

audio SW PortAudio audio API MME, DS, ASIO, SoundMgr, CoreAudio, driver OSS, ALSA audio HW

PortAudio

 Cross-platform audio API

 open-source (C)

 http://www.portaudio.com/

libsndfile

 Cross-platform sound file API

 open-source (C)

 http://www.mega-nerd.com/libsndfile/

12 wxWidgets

 Cross-platform GUI API (framework)

 open-source (C++)

 http://www.wxwidgets.org/

Audacity – fri ljudeditor

 PortAudio  libsndfile  wxWidgets

 http://audacity.sourceforge.net/

 Windows, MacOS 9/X, Linux/Unix

Audacity

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