Android8.0平台使用第三方会议视频软件无声音

在做方案时，经常遇到客户需要预装第三方软件，由于第三方软件千奇百怪，没有经过适配不一定可以直接使用，即使可以使用也可能存在一些问题。

今遇到客户要求使用Teams、Zoom等会议视频软件，视频软件最重要的就是视频通话、语音通话。直接安装软件后发现，通话时无声音。

通过跟踪分析发现，framework下在处理声音时，有些config需要适配，否则声音不会输出。这个config主要是声音通道的切换，第三方软件大部分都使用的是喇叭输出。

对于遇到的问题，本人只作了很小的改动。

文件路径：frameworks/base/services/core/java/com/android/server/audio/AudioService.java

思路：在处理消息MSG_SET_FORCE_USE和MSG_SET_FORCE_BT_A2DP_USE时，把两者分开来，系统原生的是一起处理的。调用函数setForceUse时，传递的参数强制转化为AUDIO_POLICY_FORCE_SPEAKER，即第二个参数为0即可。

@Override
        public void handleMessage(Message msg) {
            switch (msg.what) {

                case MSG_SET_DEVICE_VOLUME:
                    setDeviceVolume((VolumeStreamState) msg.obj, msg.arg1);
                    break;

                case MSG_SET_ALL_VOLUMES:
                    setAllVolumes((VolumeStreamState) msg.obj);
                    break;

                case MSG_PERSIST_VOLUME:
                    persistVolume((VolumeStreamState) msg.obj, msg.arg1);
                    break;

                case MSG_PERSIST_RINGER_MODE:
                    // note that the value persisted is the current ringer mode, not the
                    // value of ringer mode as of the time the request was made to persist
                    persistRingerMode(getRingerModeInternal());
                    break;

                case MSG_AUDIO_SERVER_DIED:
                    onAudioServerDied();
                    break;

                case MSG_UNLOAD_SOUND_EFFECTS:
                    onUnloadSoundEffects();
                    break;

                case MSG_LOAD_SOUND_EFFECTS:
                    //FIXME: onLoadSoundEffects() should be executed in a separate thread as it
                    // can take several dozens of milliseconds to complete
                    boolean loaded = onLoadSoundEffects();
                    if (msg.obj != null) {
                        LoadSoundEffectReply reply = (LoadSoundEffectReply)msg.obj;
                        synchronized (reply) {
                            reply.mStatus = loaded ? 0 : -1;
                            reply.notify();
                        }
                    }
                    break;

                case MSG_PLAY_SOUND_EFFECT:
                    onPlaySoundEffect(msg.arg1, msg.arg2);
                    break;

                case MSG_BTA2DP_DOCK_TIMEOUT:
                    // msg.obj  == address of BTA2DP device
                    synchronized (mConnectedDevices) {
                        makeA2dpDeviceUnavailableNow( (String) msg.obj );
                    }
                    break;

                case MSG_SET_FORCE_USE:
                    Log.d(TAG, "audio===MSG_SET_FORCE_USE===arg1===" + msg.arg1+"====arg2====" + msg.arg2);
                    setForceUse(msg.arg1, 0);//AUDIO_POLICY_FORCE_SPEAKER
                    break;
                case MSG_SET_FORCE_BT_A2DP_USE:
                    setForceUse(msg.arg1, msg.arg2);
                    break;

                case MSG_BT_HEADSET_CNCT_FAILED:
                    resetBluetoothSco();
                    break;

                case MSG_SET_WIRED_DEVICE_CONNECTION_STATE:
                    {   WiredDeviceConnectionState connectState =
                            (WiredDeviceConnectionState)msg.obj;
                        onSetWiredDeviceConnectionState(connectState.mType, connectState.mState,
                                connectState.mAddress, connectState.mName, connectState.mCaller);
                        mAudioEventWakeLock.release();
                    }
                    break;

                case MSG_SET_A2DP_SRC_CONNECTION_STATE:
                    onSetA2dpSourceConnectionState((BluetoothDevice)msg.obj, msg.arg1);
                    mAudioEventWakeLock.release();
                    break;

                case MSG_SET_A2DP_SINK_CONNECTION_STATE:
                    onSetA2dpSinkConnectionState((BluetoothDevice)msg.obj, msg.arg1);
                    mAudioEventWakeLock.release();
                    break;

                case MSG_A2DP_DEVICE_CONFIG_CHANGE:
                    onBluetoothA2dpDeviceConfigChange((BluetoothDevice)msg.obj);
                    mAudioEventWakeLock.release();
                    break;

                case MSG_REPORT_NEW_ROUTES: {
                    int N = mRoutesObservers.beginBroadcast();
                    if (N > 0) {
                        AudioRoutesInfo routes;
                        synchronized (mCurAudioRoutes) {
                            routes = new AudioRoutesInfo(mCurAudioRoutes);
                        }
                        while (N > 0) {
                            N--;
                            IAudioRoutesObserver obs = mRoutesObservers.getBroadcastItem(N);
                            try {
                                obs.dispatchAudioRoutesChanged(routes);
                            } catch (RemoteException e) {
                            }
                        }
                    }
                    mRoutesObservers.finishBroadcast();
                    observeDevicesForStreams(-1);
                    break;
                }

                case MSG_CHECK_MUSIC_ACTIVE:
                    onCheckMusicActive((String) msg.obj);
                    break;

                case MSG_BROADCAST_AUDIO_BECOMING_NOISY:
                    onSendBecomingNoisyIntent();
                    break;

                case MSG_CONFIGURE_SAFE_MEDIA_VOLUME_FORCED:
                case MSG_CONFIGURE_SAFE_MEDIA_VOLUME:
                    onConfigureSafeVolume((msg.what == MSG_CONFIGURE_SAFE_MEDIA_VOLUME_FORCED),
                            (String) msg.obj);
                    break;
                case MSG_PERSIST_SAFE_VOLUME_STATE:
                    onPersistSafeVolumeState(msg.arg1);
                    break;

                case MSG_BROADCAST_BT_CONNECTION_STATE:
                    onBroadcastScoConnectionState(msg.arg1);
                    break;

                case MSG_SYSTEM_READY:
                    onSystemReady();
                    break;

                case MSG_INDICATE_SYSTEM_READY:
                    onIndicateSystemReady();
                    break;

                case MSG_ACCESSORY_PLUG_MEDIA_UNMUTE:
                    onAccessoryPlugMediaUnmute(msg.arg1);
                    break;

                case MSG_PERSIST_MUSIC_ACTIVE_MS:
                    final int musicActiveMs = msg.arg1;
                    Settings.Secure.putIntForUser(mContentResolver,
                            Settings.Secure.UNSAFE_VOLUME_MUSIC_ACTIVE_MS, musicActiveMs,
                            UserHandle.USER_CURRENT);
                    break;

                case MSG_UNMUTE_STREAM:
                    onUnmuteStream(msg.arg1, msg.arg2);
                    break;

                case MSG_DYN_POLICY_MIX_STATE_UPDATE:
                    onDynPolicyMixStateUpdate((String) msg.obj, msg.arg1);
                    break;
            }
        }
    }