Android 7.0 Audio ：通话中的音频调用接口

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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，

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<SwAudioOutputDescriptor> 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<AudioInputDescriptor> 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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