Android-蓝牙AVRCP功能实现【转】
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AVRCP的按鍵定義:
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\sdk\emulator\keymaps\AVRCP.kl
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key 200?? MEDIA_PLAY_PAUSE??? WAKE
key 201?? MEDIA_PLAY_PAUSE??? WAKE
key 166?? MEDIA_STOP????????? WAKE
key 163?? MEDIA_NEXT????????? WAKE
key 165?? MEDIA_PREVIOUS????? WAKE
key 168?? MEDIA_REWIND??????? WAKE
key 208?? MEDIA_FAST_FORWARD? WAKE
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BCM(broadcom)宏定義需要打開:
BOARD_HAVE_BLUETOOTH_BCM := true
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BT音頻控制的代碼
external\bluetooth\bluez\audio\control.c
(1) 按鍵的MAP
static 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) 按鍵處理
static void handle_panel_passthrough(struct control *control,
{
??? …
??? for (i = 0; key_map[i].name != NULL; i++) {
?????? uint8_t key_quirks;
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?????? if ((operands[0] & 0x7F) != key_map[i].avrcp)
?????????? continue;
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?????? DBG("AVRCP: %s %s", key_map[i].name, status);
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?????? key_quirks = control->key_quirks[key_map[i].avrcp];
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?????? if (key_quirks & QUIRK_NO_RELEASE) {
?????????? if (!pressed) {
????????????? DBG("AVRCP: Ignoring release");
????????????? break;
?????????? }
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?????????? DBG("AVRCP: treating key press as press + release");
?????????? send_key(control->uinput, key_map[i].uinput, 1);
?????????? send_key(control->uinput, key_map[i].uinput, 0);
?????????? break;
?????? }
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?????? send_key(control->uinput, key_map[i].uinput, pressed);
?????? break;
??? }
…
}
HCIDUMP數(shù)據(jù)分析
以Sony耳機(jī)DRC-BT15為例
#adb shell
#hcidump –X
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左鍵:
> ACL data: handle 12 flags 0x02 dlen 12
??? L2CAP(d): cid 0x0042 len 8 [psm 0]
????? 0000: 30 11 0e 00 48 7c4c 00?????????????????????????? 0...H|L.
< HCI Command: Exit Sniff Mode (0x02|0x0004) plen 2
? 0000: 0c 00???????????????????????????????????????????? ..
< ACL data: handle 12 flags 0x00 dlen 12
??? 0000: 08 00 4b 00 32 11 0e 09? 48 7c4c 00????????????? ..K.2...H|L.
> 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|?
< ACL data: handle 12 flags 0x00 dlen 12
??? 0000: 08 00 4b 00 42 11 0e 09? 48 7c cc 00????????????? ..K.B...H|?
> HCI Event: Number of Completed Packets (0x13) plen 5
? 0000: 01 0c 00 02 00??????????????????????????????????? .....
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播放/暫停:
> 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 0x00 dlen 12
??? 0000: 08 00 4b 00 52 11 0e 09? 48 7c 4b 00????????????? ..K.R...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|?
< ACL data: handle 12 flags 0x00 dlen 12
??? 0000: 08 00 4b 00 62 11 0e 09? 48 7c cb 00????????????? ..K.b...H|?
> HCI Event: Number of Completed Packets (0x13) plen 5
? 0000: 01 0c 00 02 00??????????????????????????????????? .....
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右鍵:
> 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 0x00 dlen 12
??? 0000: 08 00 4b 00 72 11 0e 09? 48 7c 46 00????????????? ..K.r...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|?
< ACL data: handle 12 flags 0x00 dlen 12
??? 0000: 08 00 4b 00 82 11 0e 09? 48 7c c6 00????????????? ..K.....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????????????????????? ???????????....?
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然后將control.c的日志打印出來:
按一次”“播放/暫停鍵”:
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D/ACRVP?? (? 237): --- handle_panel_passthrough ----
D/ACRVP?? (? 237): operands[0] = 46?? 對(duì)應(yīng)PAUSE_OP
D/ACRVP?? (? 237): key_quirks = 0, pressed = 1按鍵按下
D/ACRVP?? (? 237): control->uinput = fffffffe,send_key = 201對(duì)應(yīng)MEDIA_PLAY_PAUSE
D/ACRVP?? (? 237): --- handle_panel_passthrough ----
D/ACRVP?? (? 237): operands[0] = c6? (= 0x46 ｜ 0x80 表示按鍵釋放了)
D/ACRVP?? (? 237): key_quirks = 0, pressed = 0按鍵釋放
D/ACRVP?? (? 237): control->uinput = fffffffe,send_key = 201 對(duì)應(yīng)MEDIA_PLAY_PAUSE
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再按一次”“播放/暫停鍵”:
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D/ACRVP?? (? 237): --- handle_panel_passthrough ----
D/ACRVP?? (? 237): operands[0] = 44?? 對(duì)應(yīng)PLAY_OP
D/ACRVP?? (? 237): key_quirks = 0, pressed = 1 按鍵按下
D/ACRVP?? (? 237): control->uinput = fffffffe,send_key = 200? 對(duì)應(yīng)MEDIA_PLAY_PAUSE
D/ACRVP?? (? 237): --- handle_panel_passthrough ----
D/ACRVP?? (? 237): operands[0] = c4
D/ACRVP?? (? 237): key_quirks = 0, pressed = 0? 按鍵釋放
D/ACRVP?? (? 237): control->uinput = fffffffe,send_key = 200 對(duì)應(yīng)MEDIA_PLAY_PAUSE
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next key:
D/ACRVP?? (? 237): --- handle_panel_passthrough ----
D/ACRVP?? (? 237): operands[0] = 4b對(duì)應(yīng)FORWARD_OP
D/ACRVP?? (? 237): key_quirks = 0, pressed = 1
D/ACRVP?? (? 237): control->uinput = fffffffe,send_key = 163 對(duì)應(yīng)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
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prev key:
D/ACRVP?? (? 237): --- handle_panel_passthrough ----
D/ACRVP?? (? 237): operands[0] = 4c 對(duì)應(yīng)BACKWARD_OP
D/ACRVP?? (? 237): key_quirks = 0, pressed = 1
D/ACRVP?? (? 237): control->uinput = fffffffe,send_key = 165 對(duì)應(yīng)
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 = 165 MEDIA_PREVIOUS
從上面可以看到bluetooth的協(xié)議棧blueZ是沒有問題的
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將 frameworks\base\libs\ui\EventHub.cpp的LOG打開，只能看到了control.c的日志，EventHub的getEvent完全不響應(yīng)
觀察所有l(wèi)og日志發(fā)現(xiàn)，openDevice里也沒有裝載AVRCP.kl
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初步判斷event有問題
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event分析：
$ adb shell
# cd /proc/bus/input
# cat devices
cat devices
# cat devices
cat devices
I: Bus=0019 Vendor=0001 Product=0001 Version=0001?? 參考s3c-keypad.c
N: 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=event0
B: EV=3
B: KEY=4000400 0
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I: Bus=0019 Vendor=0001 Product=0001 Version=0100參考vpad_buttons.c
N: Name="s3c-eintkey"????????? input->name = pdev->name,? gpio_keys_device_driver.name??? = "s3c-eintkey",
P: Phys=gpio-keys/input0??????? ?input->phys = "gpio-keys/input0"
S: Sysfs=/devices/platform/s3c-eintkey/input/input1?? 為什么這里是platform目錄?
U: Uniq=
H: Handlers=event1
B: EV=3
B: KEY=100000 0 0 0
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I: Bus=0018 Vendor=0000 Product=0000 Version=0000 參考amri_ts.c
N: Name="amri_ts"??????? amri_ts_driver.name = "amri_ts"
P: Phys=??????????? 沒有定義
S: Sysfs=/devices/platform/s3c2440-i2c.0/i2c-0/0-0033/input/input2?? 為什么這里是platform目錄?
U: Uniq=
H: Handlers=event2
B: EV=b
B: KEY=400 0 0 0 0 0 40000800 40 0 0 10000
B: ABS=2650000 0
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I: Bus=0000 Vendor=0000 Product=0000 Version=0000
N: Name="ecompass_data"
P: Phys=
S: Sysfs=/devices/virtual/input/input3
U: Uniq=
H: Handlers=event3
B: EV=9
B: ABS=307bf
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從上面可以看到，完全沒有AVRCP的event。
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解決辦法:
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Kernel
$ make menuconfig
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CONFIG_INPUT_UINPUT
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解決后的狀況:
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$ adb shell
# cd /proc/bus/input
# cat devices
顯示增加了一個(gè)event
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I: Bus=0005 Vendor=0000 Product=0000 Version=0000
N: Name="AVRCP"
P: Phys=
S: Sysfs=/devices/virtual/input/input4
U: Uniq=
H: Handlers=event4
B: EV=100007
B: KEY=10300 168 0 0 0 0 0
B: REL=0
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看openDevice的信息:
D/EventHub(?? 84): EventHub::readNotify nfd: 87
D/EventHub(?? 84): Opening device: /dev/input/event4
D/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.kl'
I/EventHub( ??84): New device: path=/dev/input/event4 name=AVRCP id=0x10003 (of 0x4) index=4 fd=196 classes=0x1
D/EventHub(?? 84): Adding device /dev/input/event4 0x361800 at 4, id = 3, classes = 0x1
D/EventHub(?? 84): Reporting device opened: id=0x10003, name=/dev/input/event4
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按鍵時(shí)也可以看到EventHub的信息了:
Log如下:
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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 = 201???? control.c發(fā)出201號(hào)鍵，按鍵按下了
D/EventHub(?? 84): /dev/input/event4 got: t0=937, t1=582930, type=1, code=201, v=1?? 表示從event4得到201號(hào)鍵 MEDIA_PLAY_PAUSE
D/EventHub(?? 84): iev.code=201 keyCode=85 flags=0x00000001 err=0
D/EventHub(?? 84): /dev/input/event4 got: 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/event4 got: t0=937, t1=664391, type=1, code=201, v=0 control.c發(fā)出201號(hào)鍵，按鍵釋放了
D/EventHub(?? 84): iev.code=201 keyCode=85 flags=0x00000001 err=0
D/EventHub(?? 84): /dev/input/event4 got: 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: Received signal org.bluez.AudioSink:Stopped from /org/bluez/236/hci0/dev_00_1D_BA_A5_D8_1C
E/BluetoothEventLoop.cpp(?? 84): event_filter: Received signal org.bluez.AudioSink:PropertyChanged from /org/bluez/236/hci0/dev_00_1D_BA_A5_D8_1C
E/BluetoothEventLoop.cpp(?? 84): event_filter: Received signal org.bluez.AudioSink:PropertyChanged from /org/bluez/236/hci0/dev_00_1D_BA_A5_D8_1C
V/BluetoothEventRedirector(? 244): Received android.bluetooth.a2dp.action.SINK_STATE_CHANGED
D/CachedBluetoothDevice(? 244): onProfileStateChanged: profile A2DP newProfileState 2
D/BluetoothA2dpService(?? 84): A2DP state : device: 00:1D:BA:A5:D8:1C State:4->2
D/A2DP??? (?? 61): Received BT_RESPONSE - BT_STOP_STREAM
D/dalvikvm(? 285): GC_EXPLICIT freed 87K, 56% free 2640K/5895K, external 1625K/2137K, paused 75ms
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轉(zhuǎn)載于:https://www.cnblogs.com/chenyready/p/7986712.html
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