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Android 蓝牙AVRCP功能的实现

作者:Macro Liu AVRCP的按键定义:

\sdk\emulator\keymaps\AVRCP.kl

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

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

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) 按键处理

static void handle_panel_passthrough(struct control *control,

{

…

for (i = 0; key_map[i].name != NULL; i++) {

uint8_t key_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: Ignoring release");

break;

}

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;

}

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

< ACL data: handle 12 flags 0x00 dlen 12

0000: 08 00 4b 00 32 11 0e 09 48 7c 4c 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 .....

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 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 .....

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 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 ....?

然后将control.c的日志打印出来:

按一次”“播放/暂停键”: