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/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.bluetooth;
/**
* The Android Bluetooth API is not finalized, and *will* change. Use at your
* own risk.
*
* Static helper methods and constants to decode the device class bit vector
* returned by the Bluetooth API.
*
* The Android Bluetooth API returns a 32-bit integer to represent the class.
* The format of these bits is defined at
* http://www.bluetooth.org/Technical/AssignedNumbers/baseband.htm
* (login required). This class provides static helper methods and constants to
* determine what Service Class(es) and Device Class are encoded in the 32-bit
* class.
*
* Devices typically have zero or more service classes, and exactly one device
* class. The device class is encoded as a major and minor device class, the
* minor being a subset of the major.
*
* Class is useful to describe a device (for example to show an icon),
* but does not reliably describe what profiles a device supports. To determine
* profile support you usually need to perform SDP queries.
*
* Each of these helper methods takes the 32-bit integer class as an argument.
*
* @hide
*/
public class BluetoothClass {
/** Indicates the Bluetooth API could not retrieve the class */
public static final int ERROR = 0xFF000000;
public static final int PROFILE_HEADSET = 0;
public static final int PROFILE_A2DP = 1;
public static final int PROFILE_OPP = 2;
/** Every Bluetooth device has zero or more service classes */
public static class Service {
public static final int BITMASK = 0xFFE000;
public static final int LIMITED_DISCOVERABILITY = 0x002000;
public static final int POSITIONING = 0x010000;
public static final int NETWORKING = 0x020000;
public static final int RENDER = 0x040000;
public static final int CAPTURE = 0x080000;
public static final int OBJECT_TRANSFER = 0x100000;
public static final int AUDIO = 0x200000;
public static final int TELEPHONY = 0x400000;
public static final int INFORMATION = 0x800000;
/** Returns true if the given class supports the given Service Class.
* A bluetooth device can claim to support zero or more service classes.
* @param btClass The bluetooth class.
* @param serviceClass The service class constant to test for. For
* example, Service.AUDIO. Must be one of the
* Service.FOO constants.
* @return True if the service class is supported.
*/
public static boolean hasService(int btClass, int serviceClass) {
if (btClass == ERROR) {
return false;
}
return ((btClass & Service.BITMASK & serviceClass) != 0);
}
}
/** Every Bluetooth device has exactly one device class, comprimised of
* major and minor components. We have not included the minor classes for
* major classes: NETWORKING, PERIPHERAL and IMAGING yet because they work
* a little differently. */
public static class Device {
public static final int BITMASK = 0x1FFC;
public static class Major {
public static final int BITMASK = 0x1F00;
public static final int MISC = 0x0000;
public static final int COMPUTER = 0x0100;
public static final int PHONE = 0x0200;
public static final int NETWORKING = 0x0300;
public static final int AUDIO_VIDEO = 0x0400;
public static final int PERIPHERAL = 0x0500;
public static final int IMAGING = 0x0600;
public static final int WEARABLE = 0x0700;
public static final int TOY = 0x0800;
public static final int HEALTH = 0x0900;
public static final int UNCATEGORIZED = 0x1F00;
/** Returns the Major Device Class component of a bluetooth class.
* Values returned from this function can be compared with the constants
* Device.Major.FOO. A bluetooth device can only be associated
* with one major class.
*/
public static int getDeviceMajor(int btClass) {
if (btClass == ERROR) {
return ERROR;
}
return (btClass & Device.Major.BITMASK);
}
}
// Devices in the COMPUTER major class
public static final int COMPUTER_UNCATEGORIZED = 0x0100;
public static final int COMPUTER_DESKTOP = 0x0104;
public static final int COMPUTER_SERVER = 0x0108;
public static final int COMPUTER_LAPTOP = 0x010C;
public static final int COMPUTER_HANDHELD_PC_PDA = 0x0110;
public static final int COMPUTER_PALM_SIZE_PC_PDA = 0x0114;
public static final int COMPUTER_WEARABLE = 0x0118;
// Devices in the PHONE major class
public static final int PHONE_UNCATEGORIZED = 0x0200;
public static final int PHONE_CELLULAR = 0x0204;
public static final int PHONE_CORDLESS = 0x0208;
public static final int PHONE_SMART = 0x020C;
public static final int PHONE_MODEM_OR_GATEWAY = 0x0210;
public static final int PHONE_ISDN = 0x0214;
// Minor classes for the AUDIO_VIDEO major class
public static final int AUDIO_VIDEO_UNCATEGORIZED = 0x0400;
public static final int AUDIO_VIDEO_WEARABLE_HEADSET = 0x0404;
public static final int AUDIO_VIDEO_HANDSFREE = 0x0408;
//public static final int AUDIO_VIDEO_RESERVED = 0x040C;
public static final int AUDIO_VIDEO_MICROPHONE = 0x0410;
public static final int AUDIO_VIDEO_LOUDSPEAKER = 0x0414;
public static final int AUDIO_VIDEO_HEADPHONES = 0x0418;
public static final int AUDIO_VIDEO_PORTABLE_AUDIO = 0x041C;
public static final int AUDIO_VIDEO_CAR_AUDIO = 0x0420;
public static final int AUDIO_VIDEO_SET_TOP_BOX = 0x0424;
public static final int AUDIO_VIDEO_HIFI_AUDIO = 0x0428;
public static final int AUDIO_VIDEO_VCR = 0x042C;
public static final int AUDIO_VIDEO_VIDEO_CAMERA = 0x0430;
public static final int AUDIO_VIDEO_CAMCORDER = 0x0434;
public static final int AUDIO_VIDEO_VIDEO_MONITOR = 0x0438;
public static final int AUDIO_VIDEO_VIDEO_DISPLAY_AND_LOUDSPEAKER = 0x043C;
public static final int AUDIO_VIDEO_VIDEO_CONFERENCING = 0x0440;
//public static final int AUDIO_VIDEO_RESERVED = 0x0444;
public static final int AUDIO_VIDEO_VIDEO_GAMING_TOY = 0x0448;
// Devices in the WEARABLE major class
public static final int WEARABLE_UNCATEGORIZED = 0x0700;
public static final int WEARABLE_WRIST_WATCH = 0x0704;
public static final int WEARABLE_PAGER = 0x0708;
public static final int WEARABLE_JACKET = 0x070C;
public static final int WEARABLE_HELMET = 0x0710;
public static final int WEARABLE_GLASSES = 0x0714;
// Devices in the TOY major class
public static final int TOY_UNCATEGORIZED = 0x0800;
public static final int TOY_ROBOT = 0x0804;
public static final int TOY_VEHICLE = 0x0808;
public static final int TOY_DOLL_ACTION_FIGURE = 0x080C;
public static final int TOY_CONTROLLER = 0x0810;
public static final int TOY_GAME = 0x0814;
// Devices in the HEALTH major class
public static final int HEALTH_UNCATEGORIZED = 0x0900;
public static final int HEALTH_BLOOD_PRESSURE = 0x0904;
public static final int HEALTH_THERMOMETER = 0x0908;
public static final int HEALTH_WEIGHING = 0x090C;
public static final int HEALTH_GLUCOSE = 0x0910;
public static final int HEALTH_PULSE_OXIMETER = 0x0914;
public static final int HEALTH_PULSE_RATE = 0x0918;
public static final int HEALTH_DATA_DISPLAY = 0x091C;
/** Returns the Device Class component of a bluetooth class. This includes
* both the major and minor device components. Values returned from this
* function can be compared with the constants Device.FOO. A bluetooth
* device can only be associated with one device class.
*/
public static int getDevice(int btClass) {
if (btClass == ERROR) {
return ERROR;
}
return (btClass & Device.BITMASK);
}
}
/**
* Check class bits for possible bluetooth profile support.
* This is a simple heuristic that tries to guess if a device with the
* given class bits might support specified profile. It is not accurate for all
* devices. It tries to err on the side of false positives.
* @param btClass The class
* @param profile The profile to be checked
* @return True if this device might support specified profile.
*/
public static boolean doesClassMatch(int btClass, int profile) {
if (profile == PROFILE_A2DP) {
if (BluetoothClass.Service.hasService(btClass, BluetoothClass.Service.RENDER)) {
return true;
}
// By the A2DP spec, sinks must indicate the RENDER service.
// However we found some that do not (Chordette). So lets also
// match on some other class bits.
switch (BluetoothClass.Device.getDevice(btClass)) {
case BluetoothClass.Device.AUDIO_VIDEO_HIFI_AUDIO:
case BluetoothClass.Device.AUDIO_VIDEO_HEADPHONES:
case BluetoothClass.Device.AUDIO_VIDEO_LOUDSPEAKER:
case BluetoothClass.Device.AUDIO_VIDEO_CAR_AUDIO:
return true;
default:
return false;
}
} else if (profile == PROFILE_HEADSET) {
// The render service class is required by the spec for HFP, so is a
// pretty good signal
if (BluetoothClass.Service.hasService(btClass, BluetoothClass.Service.RENDER)) {
return true;
}
// Just in case they forgot the render service class
switch (BluetoothClass.Device.getDevice(btClass)) {
case BluetoothClass.Device.AUDIO_VIDEO_HANDSFREE:
case BluetoothClass.Device.AUDIO_VIDEO_WEARABLE_HEADSET:
case BluetoothClass.Device.AUDIO_VIDEO_CAR_AUDIO:
return true;
default:
return false;
}
} else if (profile == PROFILE_OPP) {
if (BluetoothClass.Service.hasService(btClass, BluetoothClass.Service.OBJECT_TRANSFER)) {
return true;
}
switch (BluetoothClass.Device.getDevice(btClass)) {
case BluetoothClass.Device.COMPUTER_UNCATEGORIZED:
case BluetoothClass.Device.COMPUTER_DESKTOP:
case BluetoothClass.Device.COMPUTER_SERVER:
case BluetoothClass.Device.COMPUTER_LAPTOP:
case BluetoothClass.Device.COMPUTER_HANDHELD_PC_PDA:
case BluetoothClass.Device.COMPUTER_PALM_SIZE_PC_PDA:
case BluetoothClass.Device.COMPUTER_WEARABLE:
case BluetoothClass.Device.PHONE_UNCATEGORIZED:
case BluetoothClass.Device.PHONE_CELLULAR:
case BluetoothClass.Device.PHONE_CORDLESS:
case BluetoothClass.Device.PHONE_SMART:
case BluetoothClass.Device.PHONE_MODEM_OR_GATEWAY:
case BluetoothClass.Device.PHONE_ISDN:
return true;
default:
return false;
}
} else {
return false;
}
}
}
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