一点蓝牙流水账

AudioService.JAVA

setBluetoothScoOn(boolean on)

  AudioSystem.setForceUse(AudioSystem.FOR_RECORD, mForcedUseForComm);

  {"setForceUse",         "(II)I",    (void *)android_media_AudioSystem_setForceUse},

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

void AudioPolicyManagerBase::setForceUse(AudioSystem::force_use usage, AudioSystem::forced_config config)

比较重要的函数

audio_devices_t AudioPolicyManagerBase::getDeviceForInputSource(int inputSource)

-------------------------------

AudioPolicyManager, AudopolicyManagerBase

getDeviceForStrategy

audio_devices_t AudioPolicyManagerBase::getDeviceForStrategy(routing_strategy strategy,
                                                             bool fromCache)

打开SCO的方式

atResponseCodeNative(HeadsetHalConstants.AT_RESPONSE_OK, 0);

 phoneStateChangeNative(callState.mNumActive, callState.mNumHeld,
                callState.mCallState, callState.mNumber, callState.mType)

--------------------------------------

void AudioPolicyManagerBase::checkA2dpSuspend()

{
    if (!mHasA2dp) {
        return;
    }
    audio_io_handle_t a2dpOutput = getA2dpOutput();
    if (a2dpOutput == 0) {
        return;
    }


    // suspend A2DP output if:
    //      (NOT already suspended) &&
    //      ((SCO device is connected &&
    //       (forced usage for communication || for record is SCO))) ||
    //      (phone state is ringing || in call)
    //
    // restore A2DP output if:
    //      (Already suspended) &&
    //      ((SCO device is NOT connected ||
    //       (forced usage NOT for communication && NOT for record is SCO))) &&
    //      (phone state is NOT ringing && NOT in call)
    //
    if (mA2dpSuspended) {
        if (((mScoDeviceAddress == "") ||
             ((mForceUse[AudioSystem::FOR_COMMUNICATION] != AudioSystem::FORCE_BT_SCO) &&
              (mForceUse[AudioSystem::FOR_RECORD] != AudioSystem::FORCE_BT_SCO))) &&
             ((mPhoneState != AudioSystem::MODE_IN_CALL) &&
              (mPhoneState != AudioSystem::MODE_RINGTONE))) {


            mpClientInterface->restoreOutput(a2dpOutput);
            mA2dpSuspended = false;
        }
    } else {
        if (((mScoDeviceAddress != "") &&
             ((mForceUse[AudioSystem::FOR_COMMUNICATION] == AudioSystem::FORCE_BT_SCO) ||
              (mForceUse[AudioSystem::FOR_RECORD] == AudioSystem::FORCE_BT_SCO))) ||
             ((mPhoneState == AudioSystem::MODE_IN_CALL) ||
              (mPhoneState == AudioSystem::MODE_RINGTONE))) {


            mpClientInterface->suspendOutput(a2dpOutput);
            mA2dpSuspended = true;
        }
    }
}