Android Audio & OpenSL

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Yoss Cohen

Review of Android OpenSL implementation and how to use it for full duplex audio loop-back

Technology Entertainment & Humor

Android Audio with OpenSL Yossi Cohen DSP-IP

Overview ,[object Object],[object Object],[object Object]

Playing Audio on Android ,[object Object],[object Object],[object Object],[object Object]

MediaPlayer ,[object Object],[object Object],[object Object]

OpenMAX ,[object Object],[object Object],[object Object],[object Object]

OpenSL ,[object Object],[object Object],[object Object],[object Object]

OpenSL ,[object Object],[object Object],[object Object],[object Object],[object Object]

OpenSL Features ,[object Object],[object Object],Doppler MIDI messages Preset Reverb Equalizer Pitch Volume Buffer Queues Rate Metadata extraction Environmental Reverb Virtualization Stereo widening LED & Vibra 3D positioning

Android and OpenSL Open SL OpenSL ES Android OpenSL ES

OpenSL, OpenMAX and Android ,[object Object],Applications Media silicon (audio HW, CPUs, DSPs) OpenMax (AudioTrack / AudioRecord) ALSA

Profiles ,[object Object],[object Object],[object Object],[object Object],Phone Basic mobile phones Ring tone and alert tone playback (basic MIDI functionality), basic audio playback and record functionality, simple 2D audio games Game-centric mobile devices Advanced MIDI functionality, sophisticated audio capabilities such as 3D audio, audio effects, ability to handle buffers of audio, etc. Music-centric mobile devices High quality audio, ability to support multiple music audio codecs, audio streaming support Game Music

OpenSL API and Architecture ,[object Object],[object Object],[object Object],[object Object]

OpenSL Architecture ,[object Object],[object Object],[object Object],[object Object],[object Object]

Android OpenSL Sample ,[object Object],[object Object],[object Object],[object Object]

Native Audio Overview ,[object Object],[object Object],[object Object],[object Object]

Loopback sample ,[object Object],[object Object],[object Object],[object Object],[object Object]

Building an OpenSL application ,[object Object],[object Object],[object Object],[object Object],[object Object]

Add Audio Premissions ,[object Object],[object Object]

Application thread ,[object Object],[object Object]

Code Example – Create Engine ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

$Play Thread creation ,[object Object],[object Object],void *AudioInOutThread( void *ptr ) { SLresult result; initPlayer(); // set the player's state to playing result = (*bqPlayerPlay)->SetPlayState(bqPlayerPlay, SL_PLAYSTATE_PLAYING); assert(SL_RESULT_SUCCESS == result); }$

Player CallBack Function ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Resources ,[object Object],[object Object],[object Object]

DSP-IP Contact information Download slides at: www.dsp-ip.com For course & Development consulting contact www.dsp-ip.com Mail : [email_address] Phone: +972-545-313092 Fax : +972-50- 8962910 ,[object Object],[object Object]

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