android_jni_dev.c Record thread : error 0 reading data

[Chris Scheid <cscheid@xxxxxxxxxxx>]

Hi,

we are using pjsip version 2.8 with PJSUA2 on Android.

We're currently having an issue that sometimes the pjsip recording thread reads zero bytes. Then the pjsip logs will show this error:

android_jni_dev.c  Record thread : error 0 reading data

The error comes from the android_jni_dev.c file function below.

 I suspect there may be other apps or processes accessing the microphone, e.g. Google Assistant but I wasn't able to reproduce the error.

When the call is confirmed, we set the mode of the Android AudioManager to MODE_IN_CALL, which should allow the recording.

Any ideas how to troubleshoot greatly appreciated.

Thanks,

Chris

android_jni_dev.c 

   /* Start recording
     * setpriority(PRIO_PROCESS, 0, -19); //ANDROID_PRIORITY_AUDIO
     * set priority is probably not enough because it does not change the thread
     * group in scheduler
     * Temporary solution is to call the java api to set the thread priority.
     * A cool solution would be to port (if possible) the code from the
     * android os regarding set_sched groups
     */
    set_android_thread_priority(THREAD_PRIORITY_URGENT_AUDIO);
    (*jni_env)->CallVoidMethod(jni_env, stream->record, record_method);
    
    while (!stream->quit_flag) {
        pjmedia_frame frame;
        pj_status_t status;
        int bytesRead;
        
        if (!stream->running) {
            (*jni_env)->CallVoidMethod(jni_env, stream->record, stop_method);
            pj_sem_wait(stream->rec_sem);
            if (stream->quit_flag)
                break;
            (*jni_env)->CallVoidMethod(jni_env, stream->record, record_method);
        }
        
        bytesRead = (*jni_env)->CallIntMethod(jni_env, stream->record,
                                              read_method, inputBuffer,
                                              0, size);

------>
        if (bytesRead <= 0 || bytesRead != size) {
            PJ_LOG (4, (THIS_FILE, "Record thread : error %d reading data",
                                   bytesRead));
            continue;
        }
--------->
        buf = (*jni_env)->GetByteArrayElements(jni_env, inputBuffer, 0);
        frame.type = PJMEDIA_FRAME_TYPE_AUDIO;
        frame.size =  size;
        frame.bit_info = 0;
        frame.buf = (void *)buf;
        frame.timestamp.u64 = stream->rec_timestamp.u64;

        status = (*stream->rec_cb)(stream->user_data, &frame);
        (*jni_env)->ReleaseByteArrayElements(jni_env, inputBuffer, buf,
            JNI_ABORT);
if (status != PJ_SUCCESS || stream->quit_flag)
   break;

        stream->rec_timestamp.u64 += stream->param.samples_per_frame /
                                     stream->param.channel_count;
    }

    (*jni_env)->DeleteLocalRef(jni_env, inputBuffer);
    
on_return:
    detach_jvm(attached);
    PJ_LOG(5, (THIS_FILE, "Recorder thread stopped"));
    stream->rec_thread_exited = 1;

    return 0;
}

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