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POAndroid: sound API (deterministic, low latency)
 

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    <p>I'm reviewing all kinds of Android sound API and I'd like to know which one I should use. My goal is to get low latency audio or, at least, deterministic behavior regarding delay of playback.</p> <p>We've had a lot of problems and it seems that Android sound API is crap, so I'm exploring possibilities.</p> <p>The problem we have is that there is significant delay between <code>sound_out.write(sound_samples);</code> and actual sound played from the speakers. Usually it is around 300 ms. The problem is that on all devices it's different; some don't have that problem, but most are crippled (however, CS call has zero latency). The biggest issue with this ridiculous delay is that on some devices this delay appears to be some random value (i.e. it's not always 300ms).</p> <p>I'm reading about OpenSL ES and I'd like to know if anybody had experience with it, or it's the same shit but wrapped in different package?</p> <p>I prefer to have native access, but I don't mind Java layer indirection as long as I can get deterministic behavior: either the delay has to be constant (for a given device), or I'd like to get access to current playback position instead of guessing it with a error range of ±300 ms...</p> <p><b>EDIT:</b><br/>1.5 years later I tried multiple android phones to see how I can get best possible latency for a real time voice communication. Using specialized tools I measured the delay of waveout path. Best results were over 100 ms, most phones were in 180ms range. Anybody have ideas?</p>
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    1. COIf you're targeting Android 2.3 and up, you can use OpenSl ES. It is not a wrapper, and is faster, but don't expect anything below 40ms either.
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    2. COYou might also check out http://music.columbia.edu/pipermail/andraudio/ - it's a mailing list for android audio. My sense is that many people share your pain.
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      1. USJames Moore
    3. COYou may be interested to look into Android source code. There are some underlying clases like AudioPolicyManager and audio_policy which, as I understand, are used to work with audio on low level. They may be useful.
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