java.lang.Object
- org.deepsymmetry.beatlink.DeviceUpdate

Direct Known Subclasses:

Beat, CdjStatus, MixerStatus, PrecisePosition
```
@API(status=STABLE)
public abstract class DeviceUpdate
extends Object
```
Represents a device status update seen on a DJ Link network.

Author:

James Elliott

Field Summary

Fields
Modifier and Type	Field	Description
`static int`	`DEVICE_NUMBER_OFFSET`	The offset at which the device number that sent this packet can be found.
`boolean`	`isFromOpusQuad`	Indicates whether this device update came from an Opus Quad, which behaves very differently from true Pro DJ Link hardware.

Constructor Summary

Constructors
Constructor	Description
`DeviceUpdate(DatagramPacket packet, String name, int length)`	Constructor sets all the immutable interpreted fields based on the packet content.

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`InetAddress`	`getAddress()`	Get the address of the device from which this update was seen.
`abstract int`	`getBeatWithinBar()`	Get the position within a measure of music at which the most recent beat fell (a value from 1 to 4, where 1 represents the downbeat).
`abstract int`	`getBpm()`	Get the playback BPM at the time of the update.
`abstract Integer`	`getDeviceMasterIsBeingYieldedTo()`	If this packet indicates the device in the process of yielding the tempo master role to another player, this will hold the device number of that player, otherwise it will be `null`.
`String`	`getDeviceName()`	Get the name reported by the device sending the update.
`int`	`getDeviceNumber()`	Get the player/device number reporting the update.
`abstract double`	`getEffectiveTempo()`	Get the effective tempo reflected by this update, which reflects both its track BPM and pitch as needed.
`byte[]`	`getPacketBytes()`	Get the raw data bytes of the device update packet.
`abstract int`	`getPitch()`	Get the device pitch at the time of the update.
`long`	`getTimestamp()`	Get the timestamp recording when the device update was received.
`abstract boolean`	`isBeatWithinBarMeaningful()`	Returns `true` if this update is coming from a device where `getBeatWithinBar()` can reasonably be expected to have musical significance, because it respects the way a track was configured within rekordbox.
`boolean`	`isPreNexusCdj()`	Check whether this packet seems to have come from a CDJ older than the original Nexus series (which means, for example, that beat numbers will not be available, so the `TimeFinder` can't work with it).
`abstract boolean`	`isSynced()`	Is this device reporting itself synced to the current tempo master?
`abstract boolean`	`isTempoMaster()`	Is this device reporting itself to be the current tempo master?
`String`	`toString()`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Field Detail
  - DEVICE_NUMBER_OFFSET
```
public static final int DEVICE_NUMBER_OFFSET
```
    The offset at which the device number that sent this packet can be found.
    
    See Also:
    
    Constant Field Values
  - isFromOpusQuad
```
@API(status=EXPERIMENTAL)
public final boolean isFromOpusQuad
```
    Indicates whether this device update came from an Opus Quad, which behaves very differently from true Pro DJ Link hardware.
- Constructor Detail
  - DeviceUpdate
```
@API(status=STABLE)
public DeviceUpdate(DatagramPacket packet,
                    String name,
                    int length)
```
    Constructor sets all the immutable interpreted fields based on the packet content.
    
    Parameters:
    
    packet - the device update packet that was received
    
    name - the type of packet that is being processed, in case a problem needs to be reported
    
    length - the expected length of the packet
- Method Detail
  - getAddress
```
@API(status=STABLE)
public InetAddress getAddress()
```
    Get the address of the device from which this update was seen.
    
    Returns:
    
    the network address from which the update was sent
  - getTimestamp
```
@API(status=STABLE)
public long getTimestamp()
```
    Get the timestamp recording when the device update was received.
    
    Returns:
    
    the nanosecond timestamp at which we received this update
  - getDeviceName
```
@API(status=STABLE)
public String getDeviceName()
```
    Get the name reported by the device sending the update.
    
    Returns:
    
    the device name
  - isPreNexusCdj
```
@API(status=STABLE)
public boolean isPreNexusCdj()
```
    Check whether this packet seems to have come from a CDJ older than the original Nexus series (which means, for example, that beat numbers will not be available, so the TimeFinder can't work with it).
    
    Returns:
    
    true if the device name starts with "CDJ" and ends with "0".
  - getDeviceNumber
```
@API(status=STABLE)
public int getDeviceNumber()
```
    Get the player/device number reporting the update.
    
    Returns:
    
    the player number found in the update packet
  - getPacketBytes
```
@API(status=STABLE)
public byte[] getPacketBytes()
```
    Get the raw data bytes of the device update packet.
    
    Returns:
    
    the data sent by the device to update its status
  - getPitch
```
public abstract int getPitch()
```
    Get the device pitch at the time of the update. This is an integer ranging from 0 to 2097152, which corresponds to a range between completely stopping playback to playing at twice normal tempo. The equivalent percentage value can be obtained by passing the pitch to Util.pitchToPercentage(long), and the corresponding fractional scaling value by passing it to Util.pitchToMultiplier(long). Mixers always report a pitch of +0%, so tempo changes are purely reflected in the BPM value.
    
    Returns:
    
    the raw effective device pitch at the time of the update
  - getBpm
```
public abstract int getBpm()
```
    Get the playback BPM at the time of the update. This is an integer representing the BPM times 100, so a track running at 120.5 BPM would be represented by the value 12050. Mixers always report a pitch of +0%, so tempo changes are purely reflected in the BPM value.
    When the CDJ has just started up and no track has been loaded, it will report a BPM of 65535.
    
    Returns:
    
    the track BPM to two decimal places multiplied by 100
  - isTempoMaster
```
public abstract boolean isTempoMaster()
```
    Is this device reporting itself to be the current tempo master?
    
    Returns:
    
    true if the device that sent this update is the master
    
    Throws:
    
    IllegalStateException - if called with a Beat and the VirtualCdj is not running, since that is needed to find the latest status update from the device which sent the beat packet.
  - isSynced
```
public abstract boolean isSynced()
```
    Is this device reporting itself synced to the current tempo master?
    
    Returns:
    
    true if the device that sent this update is synced
    
    Throws:
    
    IllegalStateException - if called with a Beat and the VirtualCdj is not running, since that is needed to find the latest status update from the device which sent the beat packet.
  - getDeviceMasterIsBeingYieldedTo
```
public abstract Integer getDeviceMasterIsBeingYieldedTo()
```
    If this packet indicates the device in the process of yielding the tempo master role to another player, this will hold the device number of that player, otherwise it will be null.
    
    Returns:
    
    the device number, if any, this update is yielding the tempo master role to
  - getEffectiveTempo
```
public abstract double getEffectiveTempo()
```
    Get the effective tempo reflected by this update, which reflects both its track BPM and pitch as needed.
    
    Returns:
    
    the beats per minute this device is reporting
  - getBeatWithinBar
```
public abstract int getBeatWithinBar()
```
    Get the position within a measure of music at which the most recent beat fell (a value from 1 to 4, where 1 represents the downbeat). This value will be accurate for players when the track was properly configured within rekordbox (and if the music follows a standard House 4/4 time signature). The mixer makes no effort to synchronize downbeats with players, however, so this value is meaningless when coming from the mixer. The usefulness of this value can be checked with isBeatWithinBarMeaningful().
    
    Returns:
    
    the beat number within the current measure of music
  - isBeatWithinBarMeaningful
```
public abstract boolean isBeatWithinBarMeaningful()
```
    Returns true if this update is coming from a device where getBeatWithinBar() can reasonably be expected to have musical significance, because it respects the way a track was configured within rekordbox.
    
    Returns:
    
    true for status packets from players, false for status packets from mixers
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Object

Class DeviceUpdate

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

DEVICE_NUMBER_OFFSET

isFromOpusQuad

Constructor Detail

DeviceUpdate

Method Detail

getAddress

getTimestamp

getDeviceName

isPreNexusCdj

getDeviceNumber

getPacketBytes

getPitch

getBpm

isTempoMaster

isSynced

getDeviceMasterIsBeingYieldedTo

getEffectiveTempo

getBeatWithinBar

isBeatWithinBarMeaningful

toString