Questions about some api's compatibility

[Yahui-Li]

At the last of doc "Full Guide To Oboe" said that:
getFramesRead(), getFramesWritten(), getTimestamp() will return Result::ErrorUnimplemented for OpenSLES streams, But I found that in AudioStream.cpp, there has a implementation of getFramesRead():

int64_t AudioStream::getFramesRead() {
    updateFramesRead();
    return mFramesRead;
}

and in AudioOutputStreamOpenSLES.cpp, function updateFramesRead are also be implemented.

void AudioOutputStreamOpenSLES::updateFramesRead() {
    if (usingFIFO()) {
        AudioStreamBuffered::updateFramesRead();
    } else {
        mFramesRead = getFramesProcessedByServer();
    }
}

does it means those three functions(getFramesRead, getFramesWritten, getTimestamp) is also available in OpenSLES streams before OS version android O？

[dturner]

Thanks for spotting this. We'll update the docs. Issue filed: #1444