Android 蓝牙AVRCP功能的实现.doc

Android 蓝牙AVRCP功能的实现作者:Macro LiuAVRCP的按键定义:sdkemulatorkeymapsAVRCP.klkey 200 MEDIA_PLAY_PAUSE WAKEkey 201 MEDIA_PLAY_PAUSE WAKEkey 166 MEDIA_STOP WAKEkey 163 MEDIA_NEXT WAKEkey 165 MEDIA_PREVIOUS WAKEkey 168 MEDIA_REWIND WAKEkey 208 MEDIA_FAST_FORWARD WAKEBCM(broadcom)宏定义需要打开:BOARD_HAVE_BLUETOOTH_BCM := trueBT音频控制的代码externalbluetoothbluezaudiocontrol.c(1) 按键的MAPstatic struct const char *name;uint8_t avrcp;uint16_t uinput; 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 , FAST FORWARD,FAST_FORWARD_OP,KEY_FASTFORWARD , NULL ;(2) 按键处理static void handle_panel_passthrough(struct control *control, for (i = 0; key_ != NULL; i+) uint8_t key_quirks;if (operands0 & 0x7F) != key_mapi.avrcp)continue;DBG(AVRCP: %s %s, key_, status);key_quirks = control-key_quirkskey_mapi.avrcp;if (key_quirks & QUIRK_NO_RELEASE) if (!pressed) DBG(AVRCP: Ignoring release);break;DBG(AVRCP: treating key press as press + release);send_key(control-uinput, key_mapi.uinput, 1);send_key(control-uinput, key_mapi.uinput, 0);break;send_key(control-uinput, key_mapi.uinput, pressed);break;HCIDUMP数据分析以Sony耳机DRC-BT15为例#adb shell#hcidump X左键: ACL data: handle 12 flags 0x02 dlen 12 L2CAP(d): cid 0x0042 len 8 psm 0 0000: 30 11 0e 00 48 7c 4c 00 0.H|L. HCI Command: Exit Sniff Mode (0x02|0x0004) plen 2 0000: 0c 00 . HCI Event: Max Slots Change (0x1b) plen 3 0000: 0c 00 05 . HCI Event: Mode Change (0x14) plen 6 0000: 00 0c 00 00 00 00 . HCI Event: Command Status (0x0f) plen 4 0000: 0c 01 04 08 . ACL data: handle 12 flags 0x02 dlen 12 L2CAP(d): cid 0x0042 len 8 psm 0 0000: 40 11 0e 00 48 7c cc 00 .H|? HCI Event: Number of Completed Packets (0x13) plen 5 0000: 01 0c 00 02 00 .播放/暂停: ACL data: handle 12 flags 0x02 dlen 12 L2CAP(d): cid 0x0042 len 8 psm 0 0000: 50 11 0e 00 48 7c 4b 00 P.H|K. ACL data: handle 12 flags 0x02 dlen 12 L2CAP(d): cid 0x0042 len 8 psm 0 0000: 60 11 0e 00 48 7c cb 00 .H|? HCI Event: Number of Completed Packets (0x13) plen 5 0000: 01 0c 00 02 00 .右键: ACL data: handle 12 flags 0x02 dlen 12 L2CAP(d): cid 0x0042 len 8 psm 0 0000: 70 11 0e 00 48 7c 46 00 p.H|F. ACL data: handle 12 flags 0x02 dlen 12 L2CAP(d): cid 0x0042 len 8 psm 0 0000: 80 11 0e 00 48 7c c6 00 .H|? HCI Event: Number of Completed Packets (0x13) plen 5 0000: 01 0c 00 02 00 . HCI Event: Max Slots Change (0x1b) plen 3 0000: 0c 00 01 . HCI Event: Mode Change (0x14) plen 6 0000: 00 0c 00 02 c8 00 .?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): operands0 = 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_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_passthrough -D/ACRVP ( 237): operands0 = 44 对应PLAY_OPD/ACRVP ( 237): 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_passthrough -D/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_PAUSEnext key:D/ACRVP ( 237): - handle_panel_passthrough -D/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_passthrough -D/ACRVP ( 237): operands0 = cbD/ACRVP ( 237): key_quirks = 0, pressed = 0D/ACRVP ( 237): control-uinput = fffffffe,send_key = 163prev key:D/ACRVP ( 237): - handle_panel_passthrough -D/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_passthrough -D/ACRVP ( 237): operands0 = ccD/ACRVP ( 237): key_quirks = 0, pressed = 0D/ACRVP ( 237): control-uinput = fffffffe,send_key = 165 MEDIA_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：$ adb shell# cd /proc/bus/input# cat devicescat devices# cat devicescat devicesI: Bus=0019 Vendor=0001 Product=0001 Version=0001 参考s3c-keypad.cN: Name=s3c-keypad input_dev-name = DEVICE_NAME;P: Phys=s3c-keypad/input0 input_dev-phys = s3c-keypad/input0;S: Sysfs=/devices/virtual/input/input0 virtual的?U: Uniq=H: Handlers=event0B: EV=3B: KEY=4000400 0I: Bus=0019 Vendor=0001 Product=0001 Version=0100参考vpad_buttons.cN: Name=s3c-eintkey input-name = pdev-name, gpio_keys_device_= s3c-eintkey,P: Phys=gpio-keys/input0 input-phys = gpio-keys/input0S: Sysfs=/devices/platform/s3c-eintkey/input/input1 为什么这里是platform目录?U: Uniq=H: Handlers=event1B: EV=3B: KEY=100000 0 0 0I: Bus=0018 Vendor=0000 Product=0000 Version=0000 参考amri_ts.cN: Name=amri_ts amri_ts_ = amri_tsP: 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=400 0 0 0 0 0 40000800 40 0 0 10000B: ABS=2650000 0I: Bus=0000 Vendor=0000 Product=0000 Version=0000N: Name=ecompass_dataP: 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的event。解决办法:Kernel$ make menuconfigCONFIG_INPUT_UINPUT解决后的状况:$ adb shell# cd /proc/bus/input# cat devices显示增加了一个eventI: Bus=0005 Vendor=0000 Product=0000 Version=0000N: Name=AVRCPP: Phys=S: Sysfs=/devices/virtual/input/input4U: Uniq=H: Handlers=event4B: EV=100007B: KEY=10300 168 0 0 0 0 0B: REL=0看openDevice的信息:D/EventHub( 84): EventHub:readNotify nfd: 87D/EventHub( 84): Opening device: /dev/input/event4D/EventHub( 84): Getting keys.D/EventHub( 84): Getting absolute controllers.D/EventHub( 84): keylayoutFilename = /system/usr/keylayout/AVRCP.kl I/EventHub( 84): New keyboard: device-id=0x10003 devname=AVRCP propName=hw.keyboards.65539.devname keylayout=/system/usr/keylayout/AVRCP.klI/EventHub( 84): New device: path=/dev/input/event4 name=AVRCP id=0x10003 (of 0x4) index=4 fd=196 classes=0x1D/EventHub( 84): Adding device /dev/input/event4 0x361800 at 4, id = 3, classes = 0x1D/EventHub( 84): Reporting device opened: 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): operands0 = 46D/ACRVP ( 236): key_quirks = 0, pressed = 1D/ACRVP ( 236): control-uinput = 14,send_key = 201 control.c发出201号键，按键按下了D/EventHub( 84): /dev/input/event4 got: t0=937, t1=582930, type=1, code=201, v=1 表示从event4得到201号键 MEDIA_PLAY_PAUSED/EventHub( 84): iev.code=201 keyCode=85 flags=0x00000001 err=0D/EventHub( 84): /dev/input/event4 got: t0=937, t1=600241, type=0, code=0, v=0D/AudioHardware( 61): AudioStreamOutALSA:setParameters() routing=0D/ACRVP ( 236): - handle_panel_passthrough -D/ACRVP ( 236): operands0 = c6D/ACRVP ( 236): key_quirks = 0, pressed = 0D/ACRVP ( 236): control-uinput = 14,send_key = c9D/EventHub( 84): /dev/input/event4 got: t0=937, t1=664391, type=1, code=201, v=0 control.c发出201号键，按键释放了D/EventHub( 84): iev.code=201 keyCode=85 flags=0x00000001 err=0D/EventHub( 84): /dev/input/event4 got: t0=937, t1=664406, type=0, code=0, v=0D/A2DP ( 61): a2dp_stopD/A2DP ( 61): bluetooth_stopE/Bluetooth