org.red5.server.net.rtmp

## Class RTMPUtils

- java.lang.Object
- - org.red5.server.net.rtmp.RTMPUtils

All Implemented Interfaces:
  Constants

    public class RTMPUtils
    extends Object
    implements Constants

RTMP utilities class.

Author:
  The Red5 Project (red5@osflash.org), Luke Hubbard, Codegent Ltd (luke@codegent.com), Art Clarke (aclarke@xuggle.com)

### Field Summary

### Fields inherited from interface org.red5.server.net.rtmp.message.Constants

`HANDSHAKE_SIZE, HEADER_CONTINUE, HEADER_NEW, HEADER_SAME_SOURCE, HEADER_TIMER_CHANGE, MEDIUM_INT_MAX, SO_CLIENT_CLEAR_DATA, SO_CLIENT_DELETE_DATA, SO_CLIENT_INITIAL_DATA, SO_CLIENT_SEND_MESSAGE, SO_CLIENT_STATUS, SO_CLIENT_UPDATE_ATTRIBUTE, SO_CLIENT_UPDATE_DATA, SO_CONNECT, SO_DELETE_ATTRIBUTE, SO_DISCONNECT, SO_SEND_MESSAGE, SO_SET_ATTRIBUTE, SOURCE_TYPE_LIVE, SOURCE_TYPE_VOD, TYPE_ABORT, TYPE_AGGREGATE, TYPE_AUDIO_DATA, TYPE_BYTES_READ, TYPE_CHUNK_SIZE, TYPE_CLIENT_BANDWIDTH, TYPE_EDGE_ORIGIN, TYPE_FLEX_MESSAGE, TYPE_FLEX_SHARED_OBJECT, TYPE_FLEX_STREAM_SEND, TYPE_INVOKE, TYPE_NOTIFY, TYPE_PING, TYPE_SERVER_BANDWIDTH, TYPE_SHARED_OBJECT, TYPE_STREAM_METADATA, TYPE_VIDEO_DATA`

### Constructor Summary

Constructors
Constructor and Description
`RTMPUtils()`

### Method Summary

Methods
`static int` `compareTimestamps(int a, int b)` Compares two RTMP time stamps, accounting for time stamp wrapping.
`static int` `decodeChannelId(int header, int byteCount)` Decode channel id.
`static byte` `decodeHeaderSize(int header, int byteCount)` Decode header size.
`static long` `diffTimestamps(int a, int b)` Calculates the delta between two time stamps, adjusting for time stamp wrapping.
`static void` `encodeHeaderByte(org.apache.mina.core.buffer.IoBuffer out, byte headerSize, int channelId)` Encodes header size marker and channel id into header marker.
`static int` `getHeaderLength(byte headerSize)` Return header length from marker value.
`static int` `readMediumInt(org.apache.mina.core.buffer.IoBuffer in)`
`static int` `readMediumIntOld(org.apache.mina.core.buffer.IoBuffer in)`
`static int` `readReverseInt(org.apache.mina.core.buffer.IoBuffer in)` Read integer in reversed order.
`static int` `readUnsignedMediumInt(org.apache.mina.core.buffer.IoBuffer in)`
`static int` `readUnsignedMediumIntOld(org.apache.mina.core.buffer.IoBuffer in)`
`static void` `writeMediumInt(org.apache.mina.core.buffer.IoBuffer out, int value)`
`static void` `writeReverseInt(org.apache.mina.core.buffer.IoBuffer out, int value)` Writes reversed integer to buffer.
`static void` `writeReverseIntOld(org.apache.mina.core.buffer.IoBuffer out, int value)` Writes reversed integer to buffer.

### Methods inherited from class java.lang.Object

`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

### Constructor Detail

#### RTMPUtils

    public RTMPUtils()

### Method Detail

#### writeReverseIntOld

    public static void writeReverseIntOld(org.apache.mina.core.buffer.IoBuffer out,
                          int value)

Writes reversed integer to buffer.

Parameters:
  `out` - Buffer
  `value` - Integer to write

#### writeReverseInt

    public static void writeReverseInt(org.apache.mina.core.buffer.IoBuffer out,
                       int value)

Writes reversed integer to buffer.

Parameters:
  `out` - Buffer
  `value` - Integer to write

#### writeMediumInt

    public static void writeMediumInt(org.apache.mina.core.buffer.IoBuffer out,
                      int value)

Parameters:
  `out` - output buffer
  `value` - value to write

#### readUnsignedMediumInt

    public static int readUnsignedMediumInt(org.apache.mina.core.buffer.IoBuffer in)

Parameters:
  `in` - input
Returns:
  unsigned int

#### readUnsignedMediumIntOld

    public static int readUnsignedMediumIntOld(org.apache.mina.core.buffer.IoBuffer in)

Parameters:
  `in` - input
Returns:
  unsigned medium (3 byte) int.

#### readMediumIntOld

    public static int readMediumIntOld(org.apache.mina.core.buffer.IoBuffer in)

Parameters:
  `in` - input
Returns:
  signed 3-byte int

#### readMediumInt

    public static int readMediumInt(org.apache.mina.core.buffer.IoBuffer in)

Parameters:
  `in` - input
Returns:
  signed 3 byte int

#### readReverseInt

    public static int readReverseInt(org.apache.mina.core.buffer.IoBuffer in)

Read integer in reversed order.

Parameters:
  `in` - Input buffer
Returns:
  Integer

#### encodeHeaderByte

    public static void encodeHeaderByte(org.apache.mina.core.buffer.IoBuffer out,
                        byte headerSize,
                        int channelId)

Encodes header size marker and channel id into header marker.

Parameters:
  `out` - output buffer
  `headerSize` - Header size marker
  `channelId` - Channel used

#### decodeChannelId

    public static int decodeChannelId(int header,
                      int byteCount)

Decode channel id.

Parameters:
  `header` - Header
  `byteCount` - byte count
Returns:
  Channel id

#### decodeHeaderSize

    public static byte decodeHeaderSize(int header,
                        int byteCount)

Decode header size.

Parameters:
  `header` - Header byte
  `byteCount` - byte count
Returns:
  Header size byte

#### getHeaderLength

    public static int getHeaderLength(byte headerSize)

Return header length from marker value.

Parameters:
  `headerSize` - Header size marker value
Returns:
  Header length

#### compareTimestamps

    public static int compareTimestamps(int a,
                        int b)

Compares two RTMP time stamps, accounting for time stamp wrapping.

Parameters:
  `a` - First time stamp
  `b` - Second time stamp
Returns:
  -1 if a < b, 1 if a > b, or 0 if a == b

#### diffTimestamps

    public static long diffTimestamps(int a,
                      int b)

Calculates the delta between two time stamps, adjusting for time stamp wrapping.

Parameters:
  `a` - First time stamp
  `b` - Second time stamp
Returns:
  the distance between a and b, which will be negative if a is less than b.