APIs for audio applications development

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1 APIs for audio applications development Flávio Schiavoni, Antonio Goulart, Marcelo Queiroz Instituto de Matemática e Estatística Universidade de São Paulo Computer Music Research Group - IME/USP IV SMCT 03/07/2012 Flávio Schiavoni, Antonio Goulart, Marcelo Queiroz APIs(Instituto for audiode applications Matemática development e Estatística Universidade de São03/07/2012 PauloComputer 1 Music / 20 R

2 Applications Applications are built for n reasons Stand-alone or plugin Usually the application is developed using an audio API Flávio Schiavoni, Antonio Goulart, Marcelo Queiroz APIs(Instituto for audiode applications Matemática development e Estatística Universidade de São03/07/2012 PauloComputer 2 Music / 20 R

3 Application Programming Interface An interface or library provided by a computer system Provides users with a way of accesing functions and routines particular to the control program A means of harnessing an existing application functionality within a host application Choosing an API can simplify an application development......but brings it s limitations Flávio Schiavoni, Antonio Goulart, Marcelo Queiroz APIs(Instituto for audiode applications Matemática development e Estatística Universidade de São03/07/2012 PauloComputer 3 Music / 20 R

4 Choosing an API Portability Programming language License Need of MIDI Layers Flávio Schiavoni, Antonio Goulart, Marcelo Queiroz APIs(Instituto for audiode applications Matemática development e Estatística Universidade de São03/07/2012 PauloComputer 4 Music / 20 R

5 Layers Flávio Schiavoni, Antonio Goulart, Marcelo Queiroz APIs(Instituto for audiode applications Matemática development e Estatística Universidade de São03/07/2012 PauloComputer 5 Music / 20 R

6 The hardware layer Flávio Schiavoni, Antonio Goulart, Marcelo Queiroz APIs(Instituto for audiode applications Matemática development e Estatística Universidade de São03/07/2012 PauloComputer 6 Music / 20 R

7 The OS layer Flávio Schiavoni, Antonio Goulart, Marcelo Queiroz APIs(Instituto for audiode applications Matemática development e Estatística Universidade de São03/07/2012 PauloComputer 7 Music / 20 R

8 Audio Hardware Each device has it s own properties Applications need to get this information This is done talking to the interface or to the OS driver In order to simplify it, there is the audio API for each OS ex. ALSA, OSS / CoreAudio, ASIO / DirectSound, ASIO Application written with an OS audio API works only in that OS Port the application to another system Rewriting the code(using another API) Different versions of the same OS might have different latencies Flávio Schiavoni, Antonio Goulart, Marcelo Queiroz APIs(Instituto for audiode applications Matemática development e Estatística Universidade de São03/07/2012 PauloComputer 8 Music / 20 R

9 The multiplatform layer Flávio Schiavoni, Antonio Goulart, Marcelo Queiroz APIs(Instituto for audiode applications Matemática development e Estatística Universidade de São03/07/2012 PauloComputer 9 Music / 20 R

10 Multiplatform APIs Portability of a system - Capacity of running under various architectures and/or operational systems PortMedia - PortAudio and PortMidi Juce, OpenAl, SDL, RTAUdio Development of application for various OS ex. Ardour, Audacity, PureData, CSound Flávio Schiavoni, Antonio Goulart, Marcelo Queiroz APIs(Instituto for audiode applications Matemática development e Estatística Universidade de São 03/07/2012 PauloComputer10 Music / 20 R

11 Comparing multiplatform APIs API MIDI Language License JUCE Yes C++ GPL SDL No various LGPL v2 RTAudio Yes C / C++ MIT / GPL3 PortAudio Yes C / C++ MIT OpenAL No C++ LGPL Flávio Schiavoni, Antonio Goulart, Marcelo Queiroz APIs(Instituto for audiode applications Matemática development e Estatística Universidade de São 03/07/2012 PauloComputer11 Music / 20 R

12 The sound servers layer Flávio Schiavoni, Antonio Goulart, Marcelo Queiroz APIs(Instituto for audiode applications Matemática development e Estatística Universidade de São 03/07/2012 PauloComputer12 Music / 20 R

13 Sound servers Interaction among existing applications Modules working together Interconnection, like a patch bay Sound server API to develop applications able to connect to it Jack, PulseAudio, SoundFlower Rewire, DirectConnect Flávio Schiavoni, Antonio Goulart, Marcelo Queiroz APIs(Instituto for audiode applications Matemática development e Estatística Universidade de São 03/07/2012 PauloComputer13 Music / 20 R

14 Comparing sound servers API MIDI Language Multiplatform License Jack Yes C / C++ Yes GPL / LGPL PulseAudio No C Yes LGPL 2.1 SoundFLower Yes C++ No GPL v2 Flávio Schiavoni, Antonio Goulart, Marcelo Queiroz APIs(Instituto for audiode applications Matemática development e Estatística Universidade de São 03/07/2012 PauloComputer14 Music / 20 R

15 The plugins/hosts layer Flávio Schiavoni, Antonio Goulart, Marcelo Queiroz APIs(Instituto for audiode applications Matemática development e Estatística Universidade de São 03/07/2012 PauloComputer15 Music / 20 R

16 Plugins Harness an existing application functionality within a host application Extend the functionalities of an application LADSPA / LV2 / DSSI AudioUnit / VST / RTAS DirectX / VST / RTAS Plugins technology still tied with the OS s Unfortunatelly, nothing about a common API for all hosts and OS s yet Flávio Schiavoni, Antonio Goulart, Marcelo Queiroz APIs(Instituto for audiode applications Matemática development e Estatística Universidade de São 03/07/2012 PauloComputer16 Music / 20 R

17 Comparing plugins API MIDI Language Multiplatform License LADSPA No C Yes LGPL LV2 Yes C Yes LGPL AU Yes C++ No Proprietary RTAS Yes C++ Yes Proprietary VST Yes C++ Yes Proprietary DirectX Yes C++ No Proprietary Flávio Schiavoni, Antonio Goulart, Marcelo Queiroz APIs(Instituto for audiode applications Matemática development e Estatística Universidade de São 03/07/2012 PauloComputer17 Music / 20 R

18 Conclusions Possibility to choose different API s to develop an audio application Working with API s developers don t need to concentrate on low-level tasks, but only on the high-level signal processing ones An API influences the interaction among the developed application and the already existing ecossystem of applications The license must be taken into account The programming language must be taken into account - Predominance of C and C++ Flávio Schiavoni, Antonio Goulart, Marcelo Queiroz APIs(Instituto for audiode applications Matemática development e Estatística Universidade de São 03/07/2012 PauloComputer18 Music / 20 R

19 Future work Internal functioning is similar for the API s Initializing Process blocks Finalize and free memory Compare API s, considering: Source-code Difficulty to implement the same task Existing documentation for the developer Flávio Schiavoni, Antonio Goulart, Marcelo Queiroz APIs(Instituto for audiode applications Matemática development e Estatística Universidade de São 03/07/2012 PauloComputer19 Music / 20 R

20 FIM Dúvidas? Computer Music Research Group - IME/USP jaime - Just Another Implementation of Musical Effects Obrigado! Flávio Schiavoni, Antonio Goulart, Marcelo Queiroz APIs(Instituto for audiode applications Matemática development e Estatística Universidade de São 03/07/2012 PauloComputer20 Music / 20 R

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