Android蓝牙AVRCP功能的实现

1、Android蓝牙AVRC助能的实现作者:MacroLiuAVRCP勺按键定义：sdkemulatorkeymapsAVRCP.klkey200MEDIA_PLAY_PAUSEWAKEkey201MEDIA_PLAY_PAUSEWAKEkey166MEDIA_STOPWAKEkey163MEDIA_NEXTWAKEkey165MEDIA_PREVIOUSWAKEkey168MEDIA_REWINDWAKEkey208MEDIA_FAST_FORWARDWAKEBCM(broadcom宏定义需要打开：BOARD_HAVE_BLUETOOTH_BCM：=trueBT音频控制的代码externalb

2、luetoothbluezaudiocontrol.c(1)按键的MAPstaticstructconstchar*name;uint8_tavrcp;key_map="PLAY","STOP","PAUSE",uint16_tuinput;PLAY_OP,KEY_PLAYCD,STOP_OP,KEY_STOPCD,PAUSE_OP,KEY_PAUSECD,"FORWARD",FORWARD_OP,KEY_NEXTSONG,"BACKWARD",BACKWARD_OP,KEY_PREVIOUSS

3、ONG,"REWIND",REWIND_OP,KEY_REWIND,"FASTFORWARD"FAST_FORWARD_OKEY_FASTFORWARD,NULL;(2)按键处理staticvoidhandle_panel_passthrough(structcontrol*control,for(i=0;key_!=NULL;i+)uint8_tkey_quirks;if(operands。&0x7F)!=key_mapi.avrcp)continue;DBG("AVRCP:%s%s",key_mapi.n

4、ame,status);key_quirks=control->key_quirkskey_mapi.avrcp;if(key_quirks&QUIRK_NO_RELEASE)if(!pressed)DBG("AVRCP:Ignoringrelease");break;DBG("AVRCP:treatingkeypressaspress+release");send_key(control->uinput,key_mapi.uinput,1);send_key(control->uinput,key_mapi.uinput,0)

5、;break;send_key(control->uinput,key_mapi.uinput,pressed);break;,HCIDUM数据分析以Sony耳机DRC-BT1效例#adbshell#hcidump-X左键：> ACLdata:handle12flags0x02dlen12L2CAP(d):cid0x0042len8psm00000:30110e00487c4c000.H|L.> HCICommand:ExitSniffMode(0x02|0x0004)plen20000:0c00.> ACLdata:handle12flags0x00dlen12000

6、0:08004b0032110e09487c4c00.K.2.H|L.> HCIEvent:MaxSlotsChange(0x1b)plen30000:0c0005.> HCIEvent:ModeChange(0x14)plen60000:000c00000000.> HCIEvent:CommandStatus(0x0f)plen40000:0c010408.>ACLdata:handle12flags0x02dlen12L2CAP(d):cid0x0042len8psm00000:40110e00487ccc00.H|?<ACLdata:handle12fla

7、gs0x00dlen120000:08004b0042110e09487ccc00.K.B.H|?>HCIEvent:NumberofCompletedPackets(0x13)plen50000:010c000200.播放/暂停：>ACLdata:handle12flags0x02dlen12L2CAP(d):cid0x0042len8psm00000:50110e00487c4b00P.H|K.<ACLdata:handle12flags0x00dlen120000:08004b0052110e09487c4b00.K.R.H|K.>ACLdata:handle12

8、flags0x02dlen12L2CAP(d):cid0x0042len8psm00000:60110e00487ccb00'.H|?<ACLdata:handle12flags0x00dlen120000:08004b0062110e09487ccb00.K.b.H|?>HCIEvent:NumberofCompletedPackets(0x13)plen50000:010c000200.右键：>ACLdata:handle12flags0x02dlen12L2CAP(d):cid0x0042len8psm00000:70110e00487c4600p.H|F.&l

9、t;ACLdata:handle12flags0x00dlen120000:08004b0072110e09487c4600.K.r.H|F.>ACLdata:handle12flags0x02dlen12L2CAP(d):cid0x0042len8psm00000:80110e00487cc600.H|?<ACLdata:handle12flags0x00dlen120000:08004b0082110e09487cc600.K.H|?>HCIEvent:NumberofCompletedPackets(0x13)plen50000:010c000200.>HCIEv

10、ent:MaxSlotsChange(0x1b)plen30000:0c0001.>HCIEvent:ModeChange(0x14)plen60000:000c0002c800?然后将control.c的日志打印出来：按一次”“播放/暂停键”：D/ACRVP(237):-handle_panel_passthrough-D/ACRVP(237):operands。=46对应PAUSE_OPD/ACRVP(237):key_quirks=0,pressed=1按键按下D/ACRVP(237):control->uinput=fffffffe,send_key=201对应MEDIA_

11、PLAY_PAUSED/ACRVP(237):-handle_panel_passthrough-D/ACRVP(237):operands0=c6(=0x46|0x80表示按键释放了)D/ACRVP(237):key_quirks=0,pressed=0按键释放D/ACRVP(237):control->uinput=fffffffe,send_key=201对应MEDIA_PLAY_PAUSE再按一次”“播放/暂停键”：D/ACRVP(237):-handle_panel_passthroughD/ACRVP(237):operands0=44对应PLAY_OPD/ACRVP(237

12、):key_quirks=0,pressed=1按键按下D/ACRVP(237):control->uinput=fffffffe,send_key=200对应MEDIA_PLAY_PAUSED/ACRVP(237):-handle_panel_passthroughD/ACRVP(237):operands0=c4D/ACRVP(237):key_quirks=0,pressed=0按键释放D/ACRVP(237):control->uinput=fffffffe,send_key=200对应MEDIA_PLAY_PAUSEnextkey:D/ACRVP(237):-handle

13、_panel_passthroughD/ACRVP(237):operands0=4b对应FORWARD_OPD/ACRVP(237):key_quirks=0,pressed=1D/ACRVP(237):control->uinput=fffffffe,send_key=163对应MEDIA_NEXTD/ACRVP(237):-handle_panel_passthroughD/ACRVP(237):operands0=cbD/ACRVP(237):key_quirks=0,pressed=0D/ACRVP(237):control->uinput=fffffffe,send_k

14、ey=163prevkey:D/ACRVP(237):-handle_panel_passthroughD/ACRVP(237):operands0=4c对应BACKWARD_OPD/ACRVP(237):key_quirks=0,pressed=1D/ACRVP(237):control->uinput=fffffffe,send_key=165对应D/ACRVP(237):-handle_panel_passthroughD/ACRVP(237):operands0=ccD/ACRVP(237):key_quirks=0,pressed=0D/ACRVP(237):control-&

15、gt;uinput=fffffffe,send_key=165MEDIA_PREVIOUS从上面可以看到bluetooth的协议栈blueZ是没有问题的将frameworksbaselibsuiEventHub.cpp的LOG打开，只能看到了control.c的日志，EventHub的getEvent完全不响应观察所有log日志发现，openDevice里也没有装载AVRCP.kl初步判断event有问题event分析：$adbshell# cd/proc/bus/input# catdevicescatdevices#catdevicescatdevicesI:Bus=0019Vendor=

16、0001Product=0001Version=0001参考s3c-keypad.cN:Name="s3c-keypad"input_dev->name=DEVICE_NAME;P:Phys=s3c-keypad/input0input_dev->phys="s3c-keypad/input0"S:Sysfs=/devices/virtual/input/input0virtual的？U:Uniq=H: Handlers=event0B:EV=3B:KEY=40004000I: Bus=0019Vendor=0001Product=0001V

17、ersion=0100参考vpad_buttons.cN:Name="s3c-eintkey"input->name=pdev->name,gpio_keys_device_="s3c-eintkey",P:Phys=gpio-keys/input0input->phys="gpio-keys/input0"S:Sysfs=/devices/platform/s3c-eintkey/input/input1为什么这里是platform目录？U:Uniq=H: Handlers=event1B:E

18、V=3B:KEY=100000000I: Bus=0018Vendor=0000Product=0000Version=0000参考amri_ts.cN:Name="amri_ts"amri_ts_="amri_ts"P:Phys=没有定义S:Sysfs=/devices/platform/s3c2440-i2c.0/i2c-0/0-0033/input/input2为什么这里是platform目录？U:Uniq=H: Handlers=event2B:EV=bB:KEY=4000000040000800400010000B:ABS

19、=26500000I: Bus=0000Vendor=0000Product=0000Version=0000N:Name="ecompass_data"P:Phys=S:Sysfs=/devices/virtual/input/input3U:Uniq=H:Handlers=event3B:EV=9B:ABS=307bf从上面可以看到，完全没有AVRCP勺event。解决办法：Kernel$makemenuconfig<*>User1eve1dr1versupportCONFIG_INPUT_UINPUT解决后的状况：$adbshell# cd/proc/bu

20、s/input# catdevices显示增加了一个eventI:Bus=0005Vendor=0000Product=0000Version=0000N:Name="AVRCP"P:Phys=S:Sysfs=/devices/virtual/input/input4U:Uniq=H:Handlers=event4B:EV=100007B:KEY=1030016800000B:REL=0看openDevice的信息:D/EventHub(84):EventHub二readNotifynfd:87D/EventHub(84):Openingdevice:/dev/input/

21、event4D/EventHub(84):Gettingkeys.D/EventHub(84):Gettingabsolutecontrollers.D/EventHub(84):keylayoutFilename=/system/usr/keylayout/AVRCP.klI/EventHub(84):Newkeyboard:device->id=0x10003devname='AVRCP'propName='hw.keyboards.65539.devname'keylayout='/system/usr/keylayout/AVRCP.kl&

22、#39;I/EventHub(84):Newdevice:path=/dev/input/event4name=AVRCPid=0x10003(of0x4)index=4fd=196classes=0x1D/EventHub(84):Addingdevice/dev/input/event40x361800at4,id=3,classes=0x1D/EventHub(84):Reportingdeviceopened:id=0x10003,name=/dev/input/event4按键时也可以看到EventHub的信息了:Log如下:D/ACRVP(236):-handle_panel_pa

23、ssthrough-D/ACRVP(236):operands0=46D/ACRVP(236):key_quirks=0,pressed=1control.cD/ACRVP(236):control->uinput=14,send_key=201发出201号键，按键按下了一D/EventHub(84):/dev/input/event4got:t0=937,t1=582930,type=1,code=201,v=1表示从event4得至U201号键MEDIA_PLAY_PAUSED/EventHub(84):iev.code=201keyCode=85flags=0x00000001er

24、r=0D/EventHub(84):/dev/input/event4got:t0=937,t1=600241,type=0,code=0,v=0D/AudioHardware(61):AudioStreamOutALSA:setParameters()routing=0D/ACRVP(236):-handle_panel_passthroughD/ACRVP(236):operands0=c6D/ACRVP(236):key_quirks=0,pressed=0D/ACRVP(236):control->uinput=14,send_key=c9D/EventHub(84):/dev/input/event4got:t0=937,t1=664391,type=1,code=201,v=0control.c发出201号键，按键释放了D/EventHub(84):iev.code=201keyCode=85flags=0x00000001err=0D/EventHub(84):/dev/input/event4got:t0=937,t1=664406,type=0,cod