SL_RESULT_CONTENT_UNSUPPORTED when opening InputStream

[niklasdahlheimer]

Hey guys,
I got an internal error when opening an inputStream, which I can not identify. Maybe you have an idea.

I'm preparing the builder with these values:

Then call I call oboe::Result mResult = mBuilder.openStream(&m_stream);

and receive an internal error. Logcat says:
I/OboeAudio: AudioStreamOpenSLES::open(chans:1, rate:0) I/libOpenSLES: Emulating old channel mask behavior (ignoring positional mask 0x1, using default mask 0x10 based on channel count of 1) E/AudioRecord: AudioFlinger could not create record track, status: -1 E/libOpenSLES: android_audioRecorder_realize(0x7a9cbe2c2000) error creating AudioRecord object; status -1 W/libOpenSLES: Leaving Object::Realize (SL_RESULT_CONTENT_UNSUPPORTED) E/OboeAudio: Realize recorder object result:SL_RESULT_CONTENT_UNSUPPORTED

I found out that the SL_RESULT_CONTENT_UNSUPPORTED message could be caused by a missing permission, so I set
<uses-permission android:name="android.permission.RECORD_AUDIO"/>

But that didn't change anything. Somebody has an idea about that?

PS: Is it planned to create a reference for the oboe class instead of the FullGuide someday? Would be great to have something more structured even if the FullGuide is great.

[niklasdahlheimer]

A few additions:

-I've tried several framerates (48000, 44100,8000) and Chanlle counts (1,2)
-I've tried reducing the frames per callback and the buffersize
-I've ran the app on API 24 (x86) and API 26 (x86_64)
-An Output streambuilder, which I built with a similar configuration, worked fine

[philburk]

Setting the permission in the Manifest is not enough. You also have to request permission from the user. This extra step is to improve privacy protection. An example of how to do that is here:

https://github.com/googlesamples/android-audio-high-performance/blob/master/aaudio/echo/src/main/java/com/google/sample/aaudio/echo/MainActivity.java#L159

The same technique should work with any app that does recording.

Let us know if that fixes the problem.

And, yes, we need a tutorials and user guides for Oboe.

[niklasdahlheimer]

Hey Phil,
Thank you so much! Indeed that fixed the problem. Guess I've overlooked the echo-sample.