239     return result.value_or(0);  in sampleRate()
249     return result.value_or(AUDIO_FORMAT_INVALID);  in format()
260     return result.value_or(0);  in frameCount()
271     return result.value_or(0);  in latency()
289     return result.value_or(0.f);  in masterVolume()
299     return result.value_or(false);  in masterMute()
336     return result.value_or(0.f);  in streamVolume()
349     return result.value_or(false);  in streamMute()
369     return result.value_or(false);  in getMicMute()
401     return result.value_or(String8());  in getParameters()
424     return result.value_or(0);  in getInputBufferSize()
443     return result.value_or(0);  in openDuplicateOutput()
505     return result.value_or(0);  in getInputFramesLost()
517     return result.value_or(AUDIO_UNIQUE_ID_ALLOCATE);  in newAudioUniqueId()
627     return result.value_or(0);  in loadHwModule()
638     return result.value_or(0);  in getPrimaryOutputSamplingRate()
649     return result.value_or(0);  in getPrimaryOutputFrameCount()
711     return result.value_or(AUDIO_HW_SYNC_INVALID);  in getAudioHwSyncForSession()
731     return result.value_or(0);  in frameCountHAL()