78     return INVALID_OPERATION;  in addEffect()
83     return INVALID_OPERATION;  in removeEffect()
124     if (mStream->set_volume == NULL) return INVALID_OPERATION;  in setVolume()
152     if (mStream->get_next_write_timestamp == NULL) return INVALID_OPERATION;  in getNextWriteTimestamp()
157     if (mStream->set_callback == NULL) return INVALID_OPERATION;  in setCallback()
201     if (mStream->pause == NULL) return INVALID_OPERATION;  in pause()
206     if (mStream->resume == NULL) return INVALID_OPERATION;  in resume()
216     if (mStream->drain == NULL) return INVALID_OPERATION;  in drain()
221     if (mStream->flush == NULL) return INVALID_OPERATION;  in flush()
226     if (mStream->get_presentation_position == NULL) return INVALID_OPERATION;  in getPresentationPosition()
259         return INVALID_OPERATION;  in updateSourceMetadata()
265             return INVALID_OPERATION;  in updateSourceMetadata()
270             return INVALID_OPERATION;  in updateSourceMetadata()
280     if (mStream->start == NULL) return INVALID_OPERATION;  in start()
285     if (mStream->stop == NULL) return INVALID_OPERATION;  in stop()
291     if (mStream->create_mmap_buffer == NULL) return INVALID_OPERATION;  in createMmapBuffer()
296     if (mStream->get_mmap_position == NULL) return INVALID_OPERATION;  in getMmapPosition()
301     if (mStream->get_dual_mono_mode == nullptr) return INVALID_OPERATION;  in getDualMonoMode()
306     if (mStream->set_dual_mono_mode == nullptr) return INVALID_OPERATION;  in setDualMonoMode()
311     if (mStream->get_audio_description_mix_level == nullptr) return INVALID_OPERATION;  in getAudioDescriptionMixLevel()
316     if (mStream->set_audio_description_mix_level == nullptr) return INVALID_OPERATION;  in setAudioDescriptionMixLevel()
321     if (mStream->get_playback_rate_parameters == nullptr) return INVALID_OPERATION;  in getPlaybackRateParameters()
326     if (mStream->set_playback_rate_parameters == nullptr) return INVALID_OPERATION;  in setPlaybackRateParameters()
333         return INVALID_OPERATION;  in setEventCallback()
407     if (mStream->get_capture_position == NULL) return INVALID_OPERATION;  in getCapturePosition()
440         return INVALID_OPERATION;  // not supported by the HAL  in updateSinkMetadata()
446             return INVALID_OPERATION;  // not supported by the HAL  in updateSinkMetadata()
451             return INVALID_OPERATION;  // not supported by the HAL  in updateSinkMetadata()
460     if (mStream->start == NULL) return INVALID_OPERATION;  in start()
465     if (mStream->stop == NULL) return INVALID_OPERATION;  in stop()
471     if (mStream->create_mmap_buffer == NULL) return INVALID_OPERATION;  in createMmapBuffer()
476     if (mStream->get_mmap_position == NULL) return INVALID_OPERATION;  in getMmapPosition()
483     return INVALID_OPERATION;  in getActiveMicrophones()
487     if (mStream->get_active_microphones == NULL) return INVALID_OPERATION;  in getActiveMicrophones()
502     return INVALID_OPERATION;  in setPreferredMicrophoneDirection()
506     return INVALID_OPERATION;  in setPreferredMicrophoneFieldDimension()
510     if (mStream->set_microphone_direction == NULL) return INVALID_OPERATION;  in setPreferredMicrophoneDirection()
515     if (mStream->set_microphone_field_dimension == NULL) return INVALID_OPERATION;  in setPreferredMicrophoneFieldDimension()