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Android audio system(audio_hardwareinterace)
1.
안드로이드의 모든것 분석과
포팅 정리 Android Audio System (AudioHardware class) 박철희 1/10
2.
1.AudioHardware class 위치
및 역활 안드로이드의 모든것 분석과 포팅 정리 Application 역할: Framework Device control (play,stop,routing) Native Framework HAL Kernel 2/10
3.
2.AudioHardware class구조(msm7x30)
안드로이드의 모든것 분석과 포팅 정리 setParameters, getParameters openOutputStream, AudioHardwareInterface openOutputSession, setVoiceVolume , openInputStream setMode, setMasterVolume, openOutputStream, openOutputSession, AudioHardwareBase isModeInCall, isInCall openInputStream AudioStreamOut AudioHardware AudioStreamIn AudioStreamOutMSM72xx AudioStreamInMSM72xx AudioSessionOutMSM7xxx setParameters, setParameters, getParameters, getParameters, read // read audio buffer in from audio Write // write audio buffer to driver. driver Returns number of bytes written 3
4.
3.AudioHardware class 초기화
안드로이드의 모든것 분석과 포팅 정리 1)AudioHardware class AudioFlinger.cpp AudioFlinger::AudioFlinger() : BnAudioFlinger(), mAudioHardware(0), mFmEnabled(false), mMasterVolume(1.0f), mMasterMute(false), mNextUniqueId(1) { AudioHardwareInterface* mAudioHardware = AudioHardwareInterface::create(); … } AudioHardwareinterface.cpp AudioHardware.cpp(7x30) AudioHardwareInterface* AudioHardwareInterface::create() AudioHardware::AudioHardware() : { { hw = createAudioHardware(); control = } msm_mixer_open("/dev/snd/controlC0", 0); //장착된 device들을 가져와서 device_list 구조체에 넣는다.(소스 참조) AudioHardware.cpp(7x30) extern "C" AudioHardwareInterface* createAudioHardware(void) //이 device_list 는 device id를 구할 때 { 사용된다. return new AudioHardware(); } } 4/10
5.
3.AudioHardware class 초기화
안드로이드의 모든것 분석과 포팅 정리 2) AudioStreamOutMSM72xx AudioPolicyManagerBase.cpp AudioPolicyManagerBase::AudioPolicyManagerBase(AudioPolicyClientInterface *clientInterface) { … mHardwareOutput = mpClientInterface->openOutput(…); } AudioFlinger.cpp int AudioFlinger::openOutput { AudioStreamOut *output = mAudioHardware->openOutputStream(*pDevices,…) } AudioHardware.cpp(7x30) AudioStreamOut* AudioHardware::openOutputStream { … AudioStreamOutMSM72xx* out = new AudioStreamOutMSM72xx(); status_t lStatus = out->set(this, devices, format, channels, sampleRate); } AudioHardware.cpp(7x30) status_t AudioHardware::AudioStreamOutMSM72xx::set { if (pFormat) *pFormat = lFormat; if (pChannels) *pChannels = lChannels; if (pRate) *pRate = lRate; mDevices = devices; 5/10
6.
3.AudioHardware class 초기화
안드로이드의 모든것 분석과 포팅 정리 3) AudioStreamInMSM72xx AudioPolicyManagerBase.cpp audio_io_handle_t AudioPolicyManagerBase::getInput(…){ input = mpClientInterface->openInput(&inputDesc->mDevice,…); } AudioPolicyService.cpp audio_io_handle_t AudioPolicyService::openInput(…) { sp<IAudioFlinger> af = AudioSystem::get_audio_flinger(); return af->openInput(pDevices, pSamplingRate, (uint32_t *)pFormat, pChannels, acoustics); } int AudioFlinger::openInput(…) status_t AudioHardware::AudioStreamInMSM72xx::set { { … //각 입력되는 format에 맞게 AudioStreamIn *input = mAudioHardware-> mDevices, mFormat, mChannels 등을 설정 함. openInputStream(*pDevices,…); else if(*pFormat == AUDIO_HW_IN_FORMAT) } { .. mDevices = devices; AudioStreamIn* AudioHardware::openInputStream(…) mFormat = AUDIO_HW_IN_FORMAT; { mChannels = *pChannels; AudioStreamInMSM72xx* in = new AudioStreamInMSM72xx(); … status_t lStatus = in->set(this, devices, format, channels, sampleRate, acoustic_flags); } } 6/10
7.
4. AudioHardware class
method 분석 안드로이드의 모든것 분석과 포팅 정리 1) setVoiceVolume PhoneWindowManager.java handleVolumeKey(AudioManager.STREAM_VOICE_CALL, keyCode); void handleVolumeKey(int stream, int keycode) { audioService.adjustStreamVolume(stream, keycode == KeyEvent.KEYCODE_VOLUME_UP ? AudioManager.ADJUST_RAISE : AudioManager.ADJUST_LOWER,0); } AudioService.java public void adjustStreamVolume{ sendMsg(mAudioHandler, MSG_SET_SYSTEM_VOLUME, STREAM_VOLUME_ALIAS[streamType], SENDMSG_NOOP, 0, 0, streamState, 0); } public void handleMessage(Message msg) { case MSG_SET_SYSTEM_VOLUME: setSystemVolume((VolumeStreamState) msg.obj); break; } private void setSystemVolume(VolumeStreamState streamState){ setStreamVolumeIndex(streamState.mStreamType, streamState.mIndex); } private void setStreamVolumeIndex(int stream, int index) { AudioSystem.setStreamVolumeIndex(stream, (index + 5)/10); } 7/10
8.
4. AudioHardware class
method 분석 안드로이드의 모든것 분석과 포팅 정리 Android_media_AudioSystem.cpp android_media_AudioSystem_setStreamVolumeIndex(JNIEnv *env, jobject thiz, jint stream, jint index) { return check_AudioSystem_Command( AudioSystem::setStreamVolumeIndex(static_cast <AudioSystem::stream_type>(stream), index)); } AudioSystem.cpp status_t AudioSystem::setStreamVolumeIndex(stream_type stream, int index) { const sp<IAudioPolicyService>& aps = AudioSystem::get_audio_policy_service(); if (aps == 0) return PERMISSION_DENIED; return aps->setStreamVolumeIndex(stream, index); } AudioPolicyService.cpp status_t AudioPolicyService::setStreamVolumeIndex() { return mpPolicyManager->setStreamVolumeIndex(stream, index); } AudioPolicyManagerBase.cpp status_t AudioPolicyManagerBase::setStreamVolumeIndex(){ status_t volStatus = checkAndSetVolume(stream, index, mOutputs.keyAt(i), mOutputs.valueAt(i)->device()); } status_t AudioPolicyManagerBase::checkAndSetVolume{ if (stream == AudioSystem::VOICE_CALL || stream == AudioSystem::BLUETOOTH_SCO) { mpClientInterface->setVoiceVolume(voiceVolume, delayMs); } 8/10
9.
4. AudioHardware class
method 분석 안드로이드의 모든것 분석과 포팅 정리 AudioPolicyService.cpp status_t AudioPolicyService::setVoiceVolume(float volume, int delayMs) { return mAudioCommandThread->voiceVolumeCommand(volume, delayMs); } status_t AudioPolicyService::AudioCommandThread::voiceVolumeCommand { command->mCommand = SET_VOICE_VOLUME; } bool AudioPolicyService::AudioCommandThread::threadLoop() { case SET_VOICE_VOLUME: { command->mStatus = AudioSystem::setVoiceVolume(data->mVolume); } AudioSystem.cpp status_t AudioSystem::setVoiceVolume(float value) { const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger(); if (af == 0) return PERMISSION_DENIED; return af->setVoiceVolume(value); } AudioFlinger.cpp status_t AudioFlinger::setVoiceVolume(float value) { status_t ret = mAudioHardware->setVoiceVolume(value); } 9/10
10.
4. AudioHardware class
method 분석 안드로이드의 모든것 분석과 포팅 정리 AudioHardware.cpp status_t AudioHardware::setVoiceVolume(float v) { if(msm_set_voice_rx_vol(vol)) { LOGE("msm_set_voice_rx_vol(%d) failed errno = %d",vol,errno); return -1; } } Hw.c(vendor/qcom…) { int msm_set_voice_rx_vol(int volume) { struct snd_ctl_elem_value val; val.id.numid = NUMID_VOICE_VOL; val.value.integer.value[0] = DIR_RX; val.value.integer.value[1] = volume; return msm_mixer_elem_write(&val); } } static int msm_mixer_elem_write(struct snd_ctl_elem_value *val) { rc = ioctl(control->fd, SNDRV_CTL_IOCTL_ELEM_WRITE, val); } 10/10
11.
4. AudioHardware class
method 분석 안드로이드의 모든것 분석과 포팅 정리 2) setVolume QwertyKeyListener.java public boolean onKeyDown{ return super.onKeyDown(view, content, keyCode, event); } phoneWindow.java protected boolean onKeyDown{ audioManager.adjustSuggestedStreamVolume( keyCode == KeyEvent.KEYCODE_VOLUME_UP ? AudioManager.ADJUST_RAISE : AudioManager.ADJUST_LOWER, mVolumeControlStreamType, AudioManager.FLAG_SHOW_UI | AudioManager.FLAG_VIBRATE);} AudioManager.java public void adjustSuggestedStreamVolume(int direction, int suggestedStreamType, int flags) { IAudioService service = getService(); try { service.adjustSuggestedStreamVolume(direction, suggestedStreamType, flags); } catch (RemoteException e) { Log.e(TAG, "Dead object in adjustVolume", e); } } 11/10
12.
4. AudioHardware class
method 분석 안드로이드의 모든것 분석과 포팅 정리 AudioService.java public void adjustSuggestedStreamVolume{ adjustStreamVolume(streamType, direction, flags); } public void adjustStreamVolume{ sendMsg(mAudioHandler, MSG_SET_SYSTEM_VOLUME, STREAM_VOLUME_ALIAS[streamType], SENDMSG_NOOP, 0, 0, streamState, 0); AudioService.java public void handleMessage(Message msg) { switch (baseMsgWhat) { case MSG_SET_SYSTEM_VOLUME: setSystemVolume((VolumeStreamState) msg.obj); break; } AudioFlinger의 setStreamVolume을 호출해서 Volume setting함. status_t AudioFlinger::PlaybackThread::setStreamVolume(int stream, float value) { mStreamTypes[stream].volume = value; } AudioFlinger::MixerThread::threadLoop()에서 prepareTracks_l 이 수행 됨. 12/10
13.
4. AudioHardware class
method 분석 안드로이드의 모든것 분석과 포팅 정리 uint32_t AudioFlinger::MixerThread::prepareTracks_l { float typeVolume = mStreamTypes[track->type()].volume; setStreamVolume 에서 설정한 volume값을 가져와서 //volume 값 설정 float v = masterVolume * typeVolume; vl = (uint32_t)(v * cblk->volume[0]) << 12; vr = (uint32_t)(v * cblk->volume[1]) << 12; param = AudioMixer::VOLUME; //AudioMixer.cpp의 setparameter에서 처리 해줌. mAudioMixer->setParameter(param, AudioMixer::VOLUME0, (void *)left); mAudioMixer->setParameter(param, AudioMixer::VOLUME1, (void *)right); mAudioMixer->setParameter(param, AudioMixer::AUXLEVEL, (void *)aux); … } 13/10