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Android 蓝牙AVRCP功能的实现.docx

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Android 蓝牙AVRCP功能的实现.docx

Android蓝牙AVRCP功能的实现

Android蓝牙AVRCP功能的实现

作者:

MacroLiu

AVRCP的按键定义:

\sdk\emulator\keymaps\AVRCP.kl

key200MEDIA_PLAY_PAUSEWAKE

key201MEDIA_PLAY_PAUSEWAKE

key166MEDIA_STOPWAKE

key163MEDIA_NEXTWAKE

key165MEDIA_PREVIOUSWAKE

key168MEDIA_REWINDWAKE

key208MEDIA_FAST_FORWARDWAKE

BCM（broadcom）宏定义需要打开:

BOARD_HAVE_BLUETOOTH_BCM:

=true

BT音频控制的代码

external\bluetooth\bluez\audio\control.c

（1）按键的MAP

staticstruct{

constchar*name;

uint8_tavrcp;

uint16_tuinput;

}key_map[]={

{"PLAY",PLAY_OP,KEY_PLAYCD},

{"STOP",STOP_OP,KEY_STOPCD},

{"PAUSE",PAUSE_OP,KEY_PAUSECD},

{"FORWARD",FORWARD_OP,KEY_NEXTSONG},

{"BACKWARD",BACKWARD_OP,KEY_PREVIOUSSONG},

{"REWIND",REWIND_OP,KEY_REWIND},

{"FASTFORWARD",FAST_FORWARD_OP,KEY_FASTFORWARD},

{NULL}

};

（2）按键处理

staticvoidhandle_panel_passthrough（structcontrol*control,

{

…

for（i=0;key_map[i].name!

=NULL;i++）{

uint8_tkey_quirks;

if（（operands[0]&0x7F）!

=key_map[i].avrcp）

continue;

DBG（"AVRCP:

%s%s",key_map[i].name,status）;

key_quirks=control->key_quirks[key_map[i].avrcp];

if（key_quirks&QUIRK_NO_RELEASE）{

if（!

pressed）{

DBG（"AVRCP:

Ignoringrelease"）;

break;

}

DBG（"AVRCP:

treatingkeypressaspress+release"）;

send_key（control->uinput,key_map[i].uinput,1）;

send_key（control->uinput,key_map[i].uinput,0）;

break;

}

send_key（control->uinput,key_map[i].uinput,pressed）;

break;

}

…

}

HCIDUMP数据分析

以Sony耳机DRC-BT15为例

#adbshell

#hcidump–X

左键:

>ACLdata:

handle12flags0x02dlen12

L2CAP（d）:

cid0x0042len8[psm0]

0000:

30110e00487c4c000...H|L.

ExitSniffMode（0x02|0x0004）plen2

0000:

0c00..

handle12flags0x00dlen12

0000:

08004b0032110e09487c4c00..K.2...H|L.

>HCIEvent:

MaxSlotsChange（0x1b）plen3

0000:

0c0005...

>HCIEvent:

ModeChange（0x14）plen6

0000:

000c00000000......

>HCIEvent:

CommandStatus（0x0f）plen4

0000:

0c010408....

>ACLdata:

handle12flags0x02dlen12

L2CAP（d）:

cid0x0042len8[psm0]

0000:

40110e00487ccc00@...H|?

handle12flags0x00dlen12

0000:

08004b0042110e09487ccc00..K.B...H|?

>HCIEvent:

NumberofCompletedPackets（0x13）plen5

0000:

010c000200.....

播放/暂停:

>ACLdata:

handle12flags0x02dlen12

L2CAP（d）:

cid0x0042len8[psm0]

0000:

50110e00487c4b00P...H|K.

handle12flags0x00dlen12

0000:

08004b0052110e09487c4b00..K.R...H|K.

>ACLdata:

handle12flags0x02dlen12

L2CAP（d）:

cid0x0042len8[psm0]

0000:

60110e00487ccb00`...H|?

handle12flags0x00dlen12

0000:

08004b0062110e09487ccb00..K.b...H|?

>HCIEvent:

NumberofCompletedPackets（0x13）plen5

0000:

010c000200.....

右键:

>ACLdata:

handle12flags0x02dlen12

L2CAP（d）:

cid0x0042len8[psm0]

0000:

70110e00487c4600p...H|F.

handle12flags0x00dlen12

0000:

08004b0072110e09487c4600..K.r...H|F.

>ACLdata:

handle12flags0x02dlen12

L2CAP（d）:

cid0x0042len8[psm0]

0000:

80110e00487cc600....H|?

handle12flags0x00dlen12

0000:

08004b0082110e09487cc600..K.....H|?

>HCIEvent:

NumberofCompletedPackets（0x13）plen5

0000:

010c000200.....

>HCIEvent:

MaxSlotsChange（0x1b）plen3

0000:

0c0001...

>HCIEvent:

ModeChange（0x14）plen6

0000:

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[0]=46对应PAUSE_OP

D/ACRVP（237）:

key_quirks=0,pressed=1按键按下

D/ACRVP（237）:

control->uinput=fffffffe,send_key=201对应MEDIA_PLAY_PAUSE

D/ACRVP（237）:

---handle_panel_passthrough----

D/ACRVP（237）:

operands[0]=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_passthrough----

D/ACRVP（237）:

operands[0]=44对应PLAY_OP

D/ACRVP（237）:

key_quirks=0,pressed=1按键按下

D/ACRVP（237）:

control->uinput=fffffffe,send_key=200对应MEDIA_PLAY_PAUSE

D/ACRVP（237）:

---handle_panel_passthrough----

D/ACRVP（237）:

operands[0]=c4

D/ACRVP（237）:

key_quirks=0,pressed=0按键释放

D/ACRVP（237）:

control->uinput=fffffffe,send_key=200对应MEDIA_PLAY_PAUSE

nextkey:

D/ACRVP（237）:

---handle_panel_passthrough----

D/ACRVP（237）:

operands[0]=4b对应FORWARD_OP

D/ACRVP（237）:

key_quirks=0,pressed=1

D/ACRVP（237）:

control->uinput=fffffffe,send_key=163对应MEDIA_NEXT

D/ACRVP（237）:

---handle_panel_passthrough----

D/ACRVP（237）:

operands[0]=cb

D/ACRVP（237）:

key_quirks=0,pressed=0

D/ACRVP（237）:

control->uinput=fffffffe,send_key=163

prevkey:

D/ACRVP（237）:

---handle_panel_passthrough----

D/ACRVP（237）:

operands[0]=4c对应BACKWARD_OP

D/ACRVP（237）:

key_quirks=0,pressed=1

D/ACRVP（237）:

control->uinput=fffffffe,send_key=165对应

D/ACRVP（237）:

---handle_panel_passthrough----

D/ACRVP（237）:

operands[0]=cc

D/ACRVP（237）:

key_quirks=0,pressed=0

D/ACRVP（237）:

control->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frameworks\base\libs\ui\EventHub.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

#catdevices

catdevices

#catdevices

catdevices

I:

Bus=0019Vendor=0001Product=0001Version=0001参考s3c-keypad.c

N:

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=event0

B:

EV=3

B:

KEY=40004000

I:

Bus=0019Vendor=0001Product=0001Version=0100参考vpad_buttons.c

N:

Name="s3c-eintkey"input->name=pdev->name,gpio_keys_device_driver.name="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=event1

B:

EV=3

B:

KEY=100000000

I:

Bus=0018Vendor=0000Product=0000Version=0000参考amri_ts.c

N:

Name="amri_ts"amri_ts_driver.name="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=event2

B:

EV=b

B:

KEY=4000000040000800400010000

B:

ABS=26500000

I:

Bus=0000Vendor=0000Product=0000Version=0000

N:

Name="ecompass_data"

P:

Phys=

S:

Sysfs=/devices/virtual/input/input3

U:

Uniq=

H:

Handlers=event3

B:

EV=9

B:

ABS=307bf

从上面可以看到，完全没有AVRCP的event。

解决办法:

Kernel

$makemenuconfig

CONFIG_INPUT_UINPUT

解决后的状况:

$adbshell

#cd/proc/bus/input

#catdevices

显示增加了一个event

I:

Bus=0005Vendor=0000Product=0000Version=0000

N:

Name="AVRCP"

P:

Phys=

S:

Sysfs=/devices/virtual/input/input4

U:

Uniq=

H:

Handlers=event4

B:

EV=100007

B:

KEY=1030016800000

B:

REL=0

看openDevice的信息:

D/EventHub（84）:

EventHub:

:

readNotifynfd:

87

D/EventHub（84）:

Openingdevice:

/dev/input/event4

D/EventHub（84）:

Gettingkeys...

D/EventHub（84）:

Gettingabsolutecontrollers...

D/EventHub（84）:

keylayoutFilename=/system/usr/keylayout/AVRCP.kl

I/EventHub（84）:

Newkeyboard:

device->id=0x10003devname='AVRCP'propName='hw.keyboards.65539.devname'keylayout='/system/usr/keylayout/AVRCP.kl'

I/EventHub（84）:

Newdevice:

path=/dev/input/event4name=AVRCPid=0x10003（of0x4）index=4fd=196classes=0x1

D/EventHub（84）:

Addingdevice/dev/input/event40x361800at4,id=3,classes=0x1

D/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_passthrough----

D/ACRVP（236）:

operands[0]=46

D/ACRVP（236）:

key_quirks=0,pressed=1

D/ACRVP（236）:

control->uinput=14,send_key=201control.c发出201号键，按键按下了

D/EventHub（84）:

/dev/input/event4got:

t0=937,t1=582930,type=1,code=201,v=1表示从event4得到201号键MEDIA_PLAY_PAUSE

D/EventHub（84）:

iev.code=201keyCode=85flags=0x00000001err=0

D/EventHub（84）:

/dev/input/event4got:

t0=937,t1=600241,type=0,code=0,v=0

D/AudioHardware（61）:

AudioStreamOutALSA:

:

setParameters（）routing=0

D/ACRVP（236）:

---handle_panel_passthrough----

D/ACRVP（236）:

operands[0]=c6

D/ACRVP（236）:

key_quirks=0,pressed=0

D/ACRVP（236）:

control->uinput=14,send_key=c9

D/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=0

D/EventHub（84）:

/dev/input/event4got:

t0=937,t1=664406,type=0,code=0,v=0

D/A2DP（61）:

a2dp_stop

D/A2DP（61）:

bluetooth_stop

E/BluetoothEventLoop.cpp（84）:

event_filter:

Receivedsignalorg.bluez.AudioSink:

Stoppedfrom/org/bluez/236/hci0/dev_00_1D_BA_A5_D8_1C

E/BluetoothEventLoop.cpp（84）:

event_filter:

Receivedsignalorg.bluez.AudioSink:

PropertyChangedfrom/org/bluez/236/hci0/dev_00_1D_BA_A5_D8_1C

E/BluetoothEventLoop.cpp（84）:

event_filter:

Receivedsignalorg.bluez.AudioSink:

PropertyChangedfrom/org/bluez/236/hci0/dev_00_1D_BA_A5_D8_1C

V/BluetoothEventRedirector（244）:

Receivedandroid.bluetooth.a2dp.action.SINK_STATE_CHANGED

D/CachedBluetoothDevice（244）:

onProfileStateChanged:

profileA2DPnewProfileState2

D/BluetoothA2dpService（84）:

A2DPstate:

device:

00:

1D:

BA:

A5:

D8:

1CState:

4->2

D/A2DP（61）:

ReceivedBT_RESPONSE-BT_STOP_STREAM

D/dalvikvm（285）:

GC_EXPLICITfreed87K,56%free2640K/5895K,external1625K/2137K,paused75ms

MacroLiu

2011-08-01

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