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@UnstableApi
public final class RtpPacket

Represents the header and the payload of an RTP packet.

Not supported parsing at the moment: header extension and CSRC.

Structure of an RTP header (RFC3550, Section 5.1). 

 0                   1                   2                   3
 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|V=2|P|X|  CC   |M|     PT      |       sequence number         |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                           timestamp                           |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|           synchronization source (SSRC) identifier            |
+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
|            contributing source (CSRC) identifiers             |
|                             ....                              |
+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
| Profile-specific extension ID |   Extension header length     |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                       Extension header                        |
|                             ....                              |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   3                   2                   1
 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0

Summary

Nested types
public final class RtpPacket.Builder

Builder class for an RtpPacket

Constants
static final int
static final int
static final int
MAX_SIZE = 65507
static final int
static final int
static final int

Public fields
final byte[]

The RTP CSRC fields (Optional, up to 15 items).
final byte

The RTP CSRC count field (Word 0, bits 4-7).
final boolean

The RTP extension bit (Word 0, bit 3).
final boolean

The RTP marker bit (Word 0, bit 8).
final boolean

The RTP padding bit (Word 0, bit 2).
final byte[]
final byte

The RTP CSRC count field (Word 0, bits 9-15).
final int

The RTP sequence number field (Word 0, bits 16-31).
final int

The RTP SSRC field (Word 2).
final long

The RTP timestamp field (Word 1).
final byte

The RTP version field (Word 0, bits 0-1), should always be 2.

Public methods
boolean
static int
getNextSequenceNumber(int sequenceNumber)

Returns the next sequence number of the sequenceNumber.
static int
getPreviousSequenceNumber(int sequenceNumber)

Returns the previous sequence number from the sequenceNumber.
int
static @Nullable RtpPacket
parse(ParsableByteArray packetBuffer)

Creates an RtpPacket from a ParsableByteArray.
static @Nullable RtpPacket
parse(byte[] buffer, int length)

Creates an RtpPacket from a byte array.
String
int
writeToBuffer(byte[] target, int offset, int length)

Writes the data in an RTP packet to a target buffer.

Constants

CSRC_SIZE

public static final int CSRC_SIZE = 4

MAX_SEQUENCE_NUMBER

public static final int MAX_SEQUENCE_NUMBER = 65535

MAX_SIZE

public static final int MAX_SIZE = 65507

MIN_HEADER_SIZE

public static final int MIN_HEADER_SIZE = 12

MIN_SEQUENCE_NUMBER

public static final int MIN_SEQUENCE_NUMBER = 0

RTP_VERSION

public static final int RTP_VERSION = 2

Public fields

csrc

public final byte[] csrc

The RTP CSRC fields (Optional, up to 15 items).

csrcCount

public final byte csrcCount

The RTP CSRC count field (Word 0, bits 4-7).

extension

public final boolean extension

The RTP extension bit (Word 0, bit 3).

marker

public final boolean marker

The RTP marker bit (Word 0, bit 8).

padding

public final boolean padding

The RTP padding bit (Word 0, bit 2).

payloadData

public final byte[] payloadData

payloadType

public final byte payloadType

The RTP CSRC count field (Word 0, bits 9-15).

sequenceNumber

public final int sequenceNumber

The RTP sequence number field (Word 0, bits 16-31).

ssrc

public final int ssrc

The RTP SSRC field (Word 2).

timestamp

public final long timestamp

The RTP timestamp field (Word 1).

version

public final byte version

The RTP version field (Word 0, bits 0-1), should always be 2.

Public methods

equals

public boolean equals(@Nullable Object o)

getNextSequenceNumber

public static int getNextSequenceNumber(int sequenceNumber)

Returns the next sequence number of the sequenceNumber.

getPreviousSequenceNumber

public static int getPreviousSequenceNumber(int sequenceNumber)

Returns the previous sequence number from the sequenceNumber.

hashCode

public int hashCode()

parse

public static @Nullable RtpPacket parse(ParsableByteArray packetBuffer)

Creates an RtpPacket from a ParsableByteArray.

Parameters
ParsableByteArray packetBuffer

The buffer that contains the RTP packet data.
Returns
@Nullable RtpPacket

The built RtpPacket.

parse

public static @Nullable RtpPacket parse(byte[] buffer, int length)

Creates an RtpPacket from a byte array.

Parameters
byte[] buffer

The buffer that contains the RTP packet data.
int length

The length of the RTP packet.
Returns
@Nullable RtpPacket

The built RtpPacket.

toString

public String toString()

writeToBuffer

public int writeToBuffer(byte[] target, int offset, int length)

Writes the data in an RTP packet to a target buffer.

The size of the target buffer and the length argument should be big enough so that the entire RTP packet could fit. That is, if there is not enough space to store the entire RTP packet, no bytes will be written. The maximum size of an RTP packet is defined as MAX_SIZE.

Parameters
byte[] target

A target byte buffer to which the packet data is copied.
int offset

The offset into the target array at which to write.
int length

The maximum number of bytes that can be written.
Returns
int

The number of bytes written, or LENGTH_UNSET if there is not enough space to write the packet.
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