SuperpoweredAndroidAudioIO 200ms input latency

[romanbsd]

I'm creating an instance of SuperpoweredAndroidAudioIO:

io = new SuperpoweredAndroidAudioIO(sampleRate, bufferSize, true, true, audioProcessingCallback, this, inputStreamType, SL_ANDROID_STREAM_MEDIA);

Where inputStreamType is either SL_ANDROID_RECORDING_PRESET_VOICE_RECOGNITION or SL_ANDROID_RECORDING_PRESET_UNPROCESSED, and sampleRate and bufferSize are those returned by AudioManager in Java.

In the callback I'm writing both the produced audio and received samples. When I open the audio in Sonic Visualiser, there's a 200ms delay between samples sent to speaker and received from microphone.

SuperpoweredLatency reports 44ms latency.

I tried using oboe with the same settings and the samples recorded in this scenario show ~40ms latency (just as SuperpoweredLatency predicted).

What might be the reason for such huge delay?

P.S. Only OpenSLES was evaluated, AAudio wasn't used.

[gaborszanto]

Please replace SuperpoweredAndroidAudioIO.cpp with the attached experimental build and let me know the results. SuperpoweredAndroidAudioIO.cpp.zip

[gaborszanto]

Is anybody there?

[romanbsd]

I'll try it tomorrow

On Tue, Nov 26, 2019, 18:32 Gabor Szanto notifications@github.com wrote:

Is anybody there?

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[gaborszanto]

Tomorrow?

[romanbsd]

Sorry, I got busy with other things. Yes, tomorrow I'll get to it.

[romanbsd]

Tested. Same thing. Also, the new version uses AAudio, so might be not exactly apples to apples. I suspect that you have some internal buffers that add to latency.

[gaborszanto]

No, there are no internal buffering at all. You can check the source, it's open.

What are the input and output stream type settings? AAudio is used only if:

• Android 8.1+
• low latency stream types: -- output type: stream media or -1 -- input type: anything except camcorder or voice communication

[romanbsd]

But I assume that there has to be some buffer since the callbacks arrive in different times? I'll try it later on a blank slate project.

[gaborszanto]

All buffers are coming from the operating system. There is no additional buffering.

[gaborszanto]

Are you still working on this?

[romanbsd]

No, sorry. Too busy with other stuff :(

[gaborszanto]

No worries, i will close this now and when you have time you can comment.