\system\media\audio\include\system

audio.h

添加AUDIO_SOURCE_BLUETOOTH_A2DP

typedef enum {AUDIO_SOURCE_DEFAULT             = 0,AUDIO_SOURCE_MIC                 = 1,AUDIO_SOURCE_VOICE_UPLINK        = 2,AUDIO_SOURCE_VOICE_DOWNLINK      = 3,AUDIO_SOURCE_VOICE_CALL          = 4,AUDIO_SOURCE_CAMCORDER           = 5,AUDIO_SOURCE_VOICE_RECOGNITION   = 6,AUDIO_SOURCE_VOICE_COMMUNICATION = 7,AUDIO_SOURCE_REMOTE_SUBMIX       = 8, /* Source for the mix to be presented remotely.      *//* An example of remote presentation is Wifi Display *//*  where a dongle attached to a TV can be used to   *//*  play the mix captured by this audio source.      */AUDIO_SOURCE_HDMIRX              = 9,AUDIO_SOURCE_BLUETOOTH_A2DP      = 10,AUDIO_SOURCE_CNT,AUDIO_SOURCE_MAX                 = AUDIO_SOURCE_CNT - 1,AUDIO_SOURCE_FM_TUNER            = 1998,AUDIO_SOURCE_HOTWORD             = 1999, /* A low-priority, preemptible audio source forfor background software hotword detection.Same tuning as AUDIO_SOURCE_VOICE_RECOGNITION.Used only internally to the framework. Not exposedat the audio HAL. */
} audio_source_t;

\system\bt

Android.mk

ifeq ($(BLUETOOTH_A2DP_SINK),true)bdroid_CFLAGS += -DA2DP_SINK
endif

audio_a2dp_hw\Android.mk

ifeq ($(BLUETOOTH_A2DP_SINK),true)
LOCAL_CFLAGS += -DA2DP_SINK
endif

include\bt_target.h

#ifndef BTA_AV_SINK_INCLUDED
#define BTA_AV_SINK_INCLUDED TRUE
#endif

\hardware\libhardware_legacy\audio

Android.mk

ifeq ($(BLUETOOTH_A2DP_SINK),true)
LOCAL_CFLAGS += -DBLUETOOTH_A2DP_SINK
endif

AudioPolicyManagerBase.cpp

audio_devices_t AudioPolicyManagerBase::getDeviceForInputSource(int inputSource)
{uint32_t device = AUDIO_DEVICE_NONE;switch (inputSource) {case AUDIO_SOURCE_VOICE_UPLINK:if (mAvailableInputDevices & AUDIO_DEVICE_IN_VOICE_CALL) {device = AUDIO_DEVICE_IN_VOICE_CALL;break;}// FALL THROUGHcase AUDIO_SOURCE_DEFAULT:case AUDIO_SOURCE_MIC:if (mAvailableInputDevices & AUDIO_DEVICE_IN_BLUETOOTH_A2DP) {device = AUDIO_DEVICE_IN_BLUETOOTH_A2DP;break;}// FALL THROUGHcase AUDIO_SOURCE_VOICE_RECOGNITION:case AUDIO_SOURCE_HOTWORD:case AUDIO_SOURCE_VOICE_COMMUNICATION:if (mForceUse[AudioSystem::FOR_RECORD] == AudioSystem::FORCE_BT_SCO &&mAvailableInputDevices & AUDIO_DEVICE_IN_BLUETOOTH_SCO_HEADSET) {device = AUDIO_DEVICE_IN_BLUETOOTH_SCO_HEADSET;} else if (mAvailableInputDevices & AUDIO_DEVICE_IN_WIRED_HEADSET) {device = AUDIO_DEVICE_IN_WIRED_HEADSET;} else if (mAvailableInputDevices & AUDIO_DEVICE_IN_USB_DEVICE) {device = AUDIO_DEVICE_IN_USB_DEVICE;} else if (mAvailableInputDevices & AUDIO_DEVICE_IN_BUILTIN_MIC) {device = AUDIO_DEVICE_IN_BUILTIN_MIC;}break;case AUDIO_SOURCE_CAMCORDER:if (mAvailableInputDevices & AUDIO_DEVICE_IN_BACK_MIC) {device = AUDIO_DEVICE_IN_BACK_MIC;} else if (mAvailableInputDevices & AUDIO_DEVICE_IN_BUILTIN_MIC) {device = AUDIO_DEVICE_IN_BUILTIN_MIC;}break;case AUDIO_SOURCE_VOICE_DOWNLINK:case AUDIO_SOURCE_VOICE_CALL:if (mAvailableInputDevices & AUDIO_DEVICE_IN_VOICE_CALL) {device = AUDIO_DEVICE_IN_VOICE_CALL;}break;case AUDIO_SOURCE_REMOTE_SUBMIX:if (mAvailableInputDevices & AUDIO_DEVICE_IN_REMOTE_SUBMIX) {device = AUDIO_DEVICE_IN_REMOTE_SUBMIX;}break;case AUDIO_SOURCE_HDMIRX:if (mAvailableInputDevices & AUDIO_DEVICE_IN_AUX_DIGITAL) {device = AUDIO_DEVICE_IN_AUX_DIGITAL;}break;//add begincase AUDIO_SOURCE_BLUETOOTH_A2DP:if (mAvailableInputDevices & AUDIO_DEVICE_IN_BLUETOOTH_A2DP) {device = AUDIO_DEVICE_IN_BLUETOOTH_A2DP;      }break;//add enddefault:ALOGW("getDeviceForInputSource() invalid input source %d", inputSource);break;}ALOGV("getDeviceForInputSource()input source %d, device %08x", inputSource, device);return device;
}

\packages\apps\Bluetooth\src\com\android\bluetooth\a2dp

A2dpSinkStateMachine.java

import android.media.AudioRecord;
import android.media.AudioTrack;
import android.media.MediaRecorder.AudioSource;final class A2dpSinkStateMachine extends StateMachine {private AudioRecord recorder;private AudioTrack player;private int recorder_buf_size;private int player_buf_size;private boolean mThreadExitFlag = false;private boolean isPlaying = false;

通过AudioRecord和AudioTrack播放蓝牙音频

    private A2dpSinkStateMachine(A2dpSinkService svc, Context context) {super("A2dpSinkStateMachine");recorder_buf_size = AudioRecord.getMinBufferSize(44100, AudioFormat.CHANNEL_IN_STEREO, AudioFormat.ENCODING_PCM_16BIT);player_buf_size = AudioTrack.getMinBufferSize(44100, AudioFormat.CHANNEL_IN_STEREO, AudioFormat.ENCODING_PCM_16BIT);}private void cleanAudioTrack(){audioPause();mThreadExitFlag = true;if (recorder != null) {recorder.release();recorder = null;}if (player != null) {player.release();player = null;}}private void initAudioTrack()    {        if (recorder == null) {            recorder = new AudioRecord(AudioSource.BLUETOOTH_A2DP, 44100, AudioFormat.CHANNEL_IN_STEREO, AudioFormat.ENCODING_PCM_16BIT,  recorder_buf_size);        }        if (player == null) {            player = new AudioTrack(AudioManager.STREAM_MUSIC, 44100, AudioFormat.CHANNEL_OUT_STEREO, AudioFormat.ENCODING_PCM_16BIT, player_buf_size, AudioTrack.MODE_STREAM);        }    }private void audioPlay()    {        initAudioTrack();        if (isPlaying == false) {            isPlaying = true;            mThreadExitFlag = false;            new RecordThread().start();        }    }private void audioPause() {       if (isPlaying == true) {         isPlaying = false;          mThreadExitFlag = true;          recorder.stop();           player.stop();       }     }

    private class Disconnected extends State {@Overridepublic void enter() {log("Enter Disconnected: " + getCurrentMessage().what);if (isA2dpSinkEnabled()) {cleanAudioTrack();}}

        private void processAudioStateEvent(int state, BluetoothDevice device) {if (!mCurrentDevice.equals(device)) {loge("Audio State Device:" + device + "is different from ConnectedDevice:" +mCurrentDevice);return;}switch (state) {case AUDIO_STATE_STARTED:if (isA2dpSinkEnabled()) {audioPlay();}broadcastAudioState(device, BluetoothA2dpSink.STATE_PLAYING,BluetoothA2dpSink.STATE_NOT_PLAYING);break;case AUDIO_STATE_REMOTE_SUSPEND:case AUDIO_STATE_STOPPED:if (isA2dpSinkEnabled()) {audioPause();}broadcastAudioState(device, BluetoothA2dpSink.STATE_NOT_PLAYING,BluetoothA2dpSink.STATE_PLAYING);break;default:loge("Audio State Device: " + device + " bad state: " + state);break;}}}private static boolean isA2dpSinkEnabled() {    ParcelUuid[] uuids = BluetoothAdapter.getDefaultAdapter().getUuids();    return BluetoothUuid.isUuidPresent(uuids,BluetoothUuid.AudioSink); }

 class RecordThread  extends Thread{        @Override        public void run() {            byte[] buffer = new byte[recorder_buf_size];            recorder.startRecording();            player.play();            while(true) {                if (mThreadExitFlag == true) {                    break;                }                try {                    int res = recorder.read(buffer, 0, recorder_buf_size);                    if (res>0) {                        byte[] tmpBuf = new byte[res];                        System.arraycopy(buffer, 0, tmpBuf, 0, res);                        player.write(tmpBuf, 0, tmpBuf.length);                    }                } catch (Exception e) {                    e.printStackTrace();                    break;                }            }        }    }

AndroidManifest.xml

<uses-permission android:name="android.permission.RECORD_AUDIO"/>

关于在哪取蓝牙过来的音频数据，怎么能让蓝牙进入音频数据过来的模式，这部分android 已经做好了。我们只需要配置一下 packages/apps/Bluetooth/res/values/config.xml 里

<resources><bool name="profile_supported_rtkbt">true</bool><bool name="profile_supported_a2dp">true</bool><bool name="profile_supported_a2dp_sink">true</bool>

\frameworks\base

api\sytem-current.txt

api\current.txt

  public class AudioManager {field public static final int DEVICE_IN_BLUETOOTH_A2DP = -2147352576; // 0x80020000

public final class MediaRecorder.AudioSource {field public static final int BLUETOOTH_A2DP = 10; // 0xa

\media\java\android\media

AudioAttributes.java

        @SystemApipublic Builder setCapturePreset(int preset) {switch (preset) {case MediaRecorder.AudioSource.DEFAULT:case MediaRecorder.AudioSource.MIC:case MediaRecorder.AudioSource.CAMCORDER:case MediaRecorder.AudioSource.VOICE_RECOGNITION:case MediaRecorder.AudioSource.VOICE_COMMUNICATION:case MediaRecorder.AudioSource.BLUETOOTH_A2DP:mSource = preset;break;default:Log.e(TAG, "Invalid capture preset " + preset + " for AudioAttributes");}return this;

AudioManager.java

    public boolean isBluetoothA2dpOn() {/*if (AudioSystem.getDeviceConnectionState(DEVICE_OUT_BLUETOOTH_A2DP,"")== AudioSystem.DEVICE_STATE_UNAVAILABLE) {return false;} else {return true;}*/if (AudioSystem.isA2dpSinkEnabled()) {if (AudioSystem.getDeviceConnectionState(DEVICE_IN_BLUETOOTH_A2DP,"")== AudioSystem.DEVICE_STATE_UNAVAILABLE) {return false;} else {return true;}         } else { if (AudioSystem.getDeviceConnectionState(DEVICE_OUT_BLUETOOTH_A2DP,"")== AudioSystem.DEVICE_STATE_UNAVAILABLE) {return false;} else {return true;}}}public static final int DEVICE_OUT_BLUETOOTH_A2DP = AudioSystem.DEVICE_OUT_BLUETOOTH_A2DP;public static final int DEVICE_IN_BLUETOOTH_A2DP = AudioSystem.DEVICE_IN_BLUETOOTH_A2DP;

AudioSystem.java

import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothUuid;
import android.os.ParcelUuid;
import android.os.SystemProperties;public static    boolean isA2dpSinkEnabled(){String property = SystemProperties.get("device.bluetooth.ctrl");if(property.equals("true")){ParcelUuid[] uuids = BluetoothAdapter.getDefaultAdapter().getUuids();for (ParcelUuid uuid: uuids) {Log.e(TAG, "UUID: " + uuid.getUuid().toString());}return BluetoothUuid.isUuidPresent(uuids,BluetoothUuid.AudioSink);}else{return false;}}

MediaRecorder.java

 public static final int BLUETOOTH_A2DP = 10;public static final int getAudioSourceMax() {//return AudioSource.REMOTE_SUBMIX;if (AudioSystem.isA2dpSinkEnabled()) {return AudioSource.BLUETOOTH_A2DP;} else {return AudioSource.REMOTE_SUBMIX;}}

services/core/java/com/android/server/audio/AudioService.java

    public void avrcpSupportsAbsoluteVolume(String address, boolean support) {// address is not used for now, but may be used when multiple a2dp devices are supportedsynchronized (mA2dpAvrcpLock) {mAvrcpAbsVolSupported = support;
/*sendMsg(mAudioHandler, MSG_SET_DEVICE_VOLUME, SENDMSG_QUEUE,AudioSystem.DEVICE_OUT_BLUETOOTH_A2DP, 0,mStreamStates[AudioSystem.STREAM_MUSIC], 0);sendMsg(mAudioHandler, MSG_SET_DEVICE_VOLUME, SENDMSG_QUEUE,AudioSystem.DEVICE_OUT_BLUETOOTH_A2DP, 0,mStreamStates[AudioSystem.STREAM_RING], 0);
*/if (AudioSystem.isA2dpSinkEnabled()) {sendMsg(mAudioHandler, MSG_SET_DEVICE_VOLUME, SENDMSG_QUEUE,AudioSystem.DEVICE_IN_BLUETOOTH_A2DP, 0,mStreamStates[AudioSystem.STREAM_MUSIC], 0);sendMsg(mAudioHandler, MSG_SET_DEVICE_VOLUME, SENDMSG_QUEUE,AudioSystem.DEVICE_IN_BLUETOOTH_A2DP, 0,mStreamStates[AudioSystem.STREAM_RING], 0);} else {sendMsg(mAudioHandler, MSG_SET_DEVICE_VOLUME, SENDMSG_QUEUE,AudioSystem.DEVICE_OUT_BLUETOOTH_A2DP, 0,mStreamStates[AudioSystem.STREAM_MUSIC], 0);sendMsg(mAudioHandler, MSG_SET_DEVICE_VOLUME, SENDMSG_QUEUE,AudioSystem.DEVICE_OUT_BLUETOOTH_A2DP, 0,mStreamStates[AudioSystem.STREAM_RING], 0);}}}

\frameworks\av\services\audiopolicy

enginedefault\src\Engine.cpp

audio_devices_t Engine::getDeviceForInputSource(audio_source_t inputSource) const
{const DeviceVector &availableOutputDevices = mApmObserver->getAvailableOutputDevices();const DeviceVector &availableInputDevices = mApmObserver->getAvailableInputDevices();const SwAudioOutputCollection &outputs = mApmObserver->getOutputs();audio_devices_t availableDeviceTypes = availableInputDevices.types() & ~AUDIO_DEVICE_BIT_IN;uint32_t device = AUDIO_DEVICE_NONE;switch (inputSource) {case AUDIO_SOURCE_VOICE_UPLINK:if (availableDeviceTypes & AUDIO_DEVICE_IN_VOICE_CALL) {device = AUDIO_DEVICE_IN_VOICE_CALL;break;}break;case AUDIO_SOURCE_DEFAULT:device = AUDIO_DEVICE_IN_BUILTIN_MIC;break;//begincase AUDIO_SOURCE_BLUETOOTH_A2DP:if (availableDeviceTypes & AUDIO_DEVICE_IN_BLUETOOTH_A2DP) {device = AUDIO_DEVICE_IN_BLUETOOTH_A2DP;}break;

audio_policy.conf

修改audio_policy.conf配置

  a2dp {outputs {a2dp {sampling_rates 44100channel_masks AUDIO_CHANNEL_OUT_STEREOformats AUDIO_FORMAT_PCM_16_BITdevices AUDIO_DEVICE_OUT_ALL_A2DP}}inputs {a2dp {sampling_rates 44100channel_masks AUDIO_CHANNEL_IN_STEREOformats AUDIO_FORMAT_PCM_16_BITdevices AUDIO_DEVICE_IN_BLUETOOTH_A2DP}}}

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