Android 7.0 Audio :通话中的音频调用接口

对于Audio在通话中的处理,根据不同的功能,有不同的调用路径,

 Android 7.0 Audio :通话中的音频调用接口_第1张图片

 

Android 7.0 Audio :通话中的音频调用接口_第2张图片

 

1) 通话中 打开speaker 流程   enableSpeaker

 

对于在通话中打开扬声器,走图示1的调用路径,

 

 

在telephony部分,调用流程如下,

InCallAudioManager. enableSpeaker--telecomAdapter.setAudioRoute(CallAudioState.ROUTE_SPEAKER)/binderIPC-- mInCallService.setAudioRoute(route);-- mPhone.setAudioRoute(route);-- mInCallAdapter.setAudioRoute(route);--mAdapter.setAudioRoute(route);/binder IPC--…--CallsManager.

setAudioRoute --mCallAudioManager.setAudioRoute(route)--CallAudioRouteStateMachine.sendMessageWithSessionInfo / CallAudioRouteStateMachine.USER_SWITCH_SPEAKER/--通过ActiveSpeakerRoute向下..—setSpeakerphoneOn-- mAudioManager.setSpeakerphoneOn(on)

 

这样,就到了Audio系统了,根据之前的章节,就知道接下来就是AM/AService/ASystem了,

AudioManager.setSpeakerphoneOn/ binder IPC--setSpeakerphoneOn --/ mForcedUseForComm = AudioSystem.FORCE_SPEAKER / sendMsg(mAudioHandler,MSG_SET_FORCE_USE, SENDMSG_QUEUE,

               AudioSystem.FOR_COMMUNICATION, mForcedUseForComm, null, 0) /内部handler--setForceUse --setForceUseInt_SyncDevices -- AudioSystem.setForceUse/jni-AudioSystem::setForceUse

 

在native部分的调用流程如下,

AudioSystem::setForceUse--AudioPolicyService::setForceUse(AudioPolicyInterfaceImpl.cpp)--AudioPolicyManager::setForceUse

APM处理部分如下,

 

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

void AudioPolicyManager::setForceUse(audio_policy_force_use_t usage,

                                         audio_policy_forced_cfg_t config)

{

 

    if (mEngine->setForceUse(usage, config) != NO_ERROR) {

        ALOGW("setForceUse() could not set force cfg %d for usage %d", config, usage);

        return;

}

 

    checkA2dpSuspend();

    checkOutputForAllStrategies();

    updateDevicesAndOutputs();

 

    if (mEngine->getPhoneState() == AUDIO_MODE_IN_CALL && hasPrimaryOutput()) {

        audio_devices_t newDevice = getNewOutputDevice(mPrimaryOutput, true /*fromCache*/);

        updateCallRouting(newDevice);

    }

    for (size_t i = 0; i < mOutputs.size(); i++) {

        sp outputDesc = mOutputs.valueAt(i);

        audio_devices_t newDevice = getNewOutputDevice(outputDesc, true /*fromCache*/);

        if ((mEngine->getPhoneState() != AUDIO_MODE_IN_CALL) || (outputDesc != mPrimaryOutput)) {

            setOutputDevice(outputDesc, newDevice, (newDevice != AUDIO_DEVICE_NONE));

        }

        if (forceVolumeReeval && (newDevice != AUDIO_DEVICE_NONE)) {

            applyStreamVolumes(outputDesc, newDevice, 0, true);

        }

    }

 

    audio_io_handle_t activeInput = mInputs.getActiveInput();

    if (activeInput != 0) {

        sp activeDesc = mInputs.valueFor(activeInput);

        audio_devices_t newDevice = getNewInputDevice(activeInput);

        // Force new input selection if the new device can not be reached via current input

        if (activeDesc->mProfile->getSupportedDevices().types() & (newDevice & ~AUDIO_DEVICE_BIT_IN)) {

            setInputDevice(activeInput, newDevice);

        } else {

            closeInput(activeInput);

        }

    }

}

 

 

 

 

a)mEngine->setForceUse

 

实现在Engine.cpp里面,主要是判断当前对设备设置是否合逻辑,并给mForceUse的成员赋值。

 

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

status_t Engine::setForceUse(audio_policy_force_use_t usage, audio_policy_forced_cfg_t config)

{

    switch(usage) {

    case AUDIO_POLICY_FORCE_FOR_COMMUNICATION:

        if (config != AUDIO_POLICY_FORCE_SPEAKER && config != AUDIO_POLICY_FORCE_BT_SCO &&

            config != AUDIO_POLICY_FORCE_NONE) {

            ALOGW("setForceUse() invalid config %d for FOR_COMMUNICATION", config);

            return BAD_VALUE;

        }

        mForceUse[usage] = config;

        break;

 

 

 

b)checkA2dpSuspend

checkA2dpSuspend--AudioPolicyService::AudioPolicyClient::suspendOutput--AudioFlinger::suspendOutput--thread->suspend

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

               void        suspend() { (void) android_atomic_inc(&mSuspended); }

 

最终是给&mSuspended赋值。

 

 

c)checkOutputForStrategy 根据策略类型和当前设置获取设备类型,并最input和output进行处理,最后invalidateStream。

其中,

AudioPolicyManager::checkOutputForStrategy--audio_devices_tAudioPolicyManager::getDeviceForStrategy--mEngine->getDeviceForStrategy,

Engine.cpp里,

根据strategy为STRATEGY_PHONE,以及刚刚设置的mForceUse[AUDIO_POLICY_FORCE_FOR_COMMUNICATION]为AUDIO_POLICY_FORCE_SPEAKER,匹配到正确的设备类型,刚好为AUDIO_DEVICE_OUT_SPEAKER,

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

audio_devices_t Engine::getDeviceForStrategyInt(routing_strategy strategy,

                                                DeviceVector availableOutputDevices,

                                                DeviceVector availableInputDevices,

                                                const SwAudioOutputCollection &outputs) const

{

    uint32_t device = AUDIO_DEVICE_NONE;

    uint32_t availableOutputDevicesType = availableOutputDevices.types();

 

    switch (strategy) {

    case STRATEGY_PHONE:

 

        switch (mForceUse[AUDIO_POLICY_FORCE_FOR_COMMUNICATION]) {

 

        case AUDIO_POLICY_FORCE_SPEAKER:

            // when not in a phone call, phone strategy should route STREAM_VOICE_CALL to

            // A2DP speaker when forcing to speaker output

 

            device = availableOutputDevicesType & AUDIO_DEVICE_OUT_SPEAKER;

            break;

        }

    break;

 

 

d)之后是updateCallRouting,设置device的操作。

 

 

 

2)dtmf音

 

在telephony模块,调用流程(这里只分析了声音播放,并不包含信令处理)

CallsManager.playDtmfTone --DtmfLocalTonePlayer .playTone--mToneGenerator.startTone

 

 

在Audio模块,调用流程

 

ToneGenerator.startTone--jni--android_media_ToneGenerator_startTone--ToneGenerator::startTone

 

ToneGenerator则直接使用了AT,先initAudioTrack创建AT实例,prepareWave生成PCM数据,再mpAudioTrack->start()开始,

 

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

bool ToneGenerator::startTone(tone_type toneType, int durationMs) {

 

toneType = getToneForRegion(toneType);

 

    if (mState == TONE_IDLE) {

        ALOGV("startTone: try to re-init AudioTrack");

        if (!initAudioTrack()) {

            return lResult;

        }

    }

 

    if (mState == TONE_INIT) {

        if (prepareWave()) {

            ALOGV("Immediate start, time %d", (unsigned int)(systemTime()/1000000));

            lResult = true;

            mState = TONE_STARTING;

            if (clock_gettime(CLOCK_MONOTONIC, &mStartTime) != 0) {

                mStartTime.tv_sec = 0;

            }

            mLock.unlock();

            mpAudioTrack->start();

    }

    mLock.unlock();

}

 

 

 

 

可以看到,initAudioTrack创建AT实例时,使用了AUDIO_OUTPUT_FLAG_FAST的方式播放,通过audioCallback回调完成数据填充。

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

bool ToneGenerator::initAudioTrack() {

 

    // Open audio track in mono, PCM 16bit, default sampling rate, default buffer size

    mpAudioTrack = new AudioTrack();

    ALOGV("Create Track: %p", mpAudioTrack.get());

 

    mpAudioTrack->set(mStreamType,

                      0,    // sampleRate

                      AUDIO_FORMAT_PCM_16_BIT,

                      AUDIO_CHANNEL_OUT_MONO,

                      0,    // frameCount

                      AUDIO_OUTPUT_FLAG_FAST,

                      audioCallback,

                      this, // user

                      0,    // notificationFrames

                      0,    // sharedBuffer

                      mThreadCanCallJava,

                      AUDIO_SESSION_ALLOCATE,

                      AudioTrack::TRANSFER_CALLBACK);

 

    if (mpAudioTrack->initCheck() != NO_ERROR) {

        ALOGE("AudioTrack->initCheck failed");

        goto initAudioTrack_exit;

    }

 

    mpAudioTrack->setVolume(mVolume);

 

    mState = TONE_INIT;

 

    return true;

 

initAudioTrack_exit:

 

    ALOGV("Init failed: %p", mpAudioTrack.get());

 

    // Cleanup

    mpAudioTrack.clear();

 

    return false;

}

 

这条通道走的是AF的路径,并不在上图的三个path之中。

 

 

 

3)标记3的场景有,Telephony向Audio设置当前是通话状态,这个会用setMode (MODE_INCALL);向Audio设置当前是VOICE通话还是LTE通话,这个会用AudioSystem::setParameters(),

 

vendor\qcom\proprietary\qcril\qcril_qmi\qcril_am.cc

 

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