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2.2.1 RDPSND PDU Header (SNDPROLOG)

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The RDPSND PDU header is present in many audio PDUs. It is used to identify the PDU type, specify the length of the PDU, and convey message flags.


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msgType

bPad

BodySize

msgType (1 byte): An 8-bit unsigned integer that specifies the type of audio PDU that follows the BodySize field.

Value

Meaning

SNDC_CLOSE

0x01

Close PDU

SNDC_WAVE

0x02

WaveInfo PDU

SNDC_SETVOLUME

0x03

Volume PDU

SNDC_SETPITCH

0x04

Pitch PDU

SNDC_WAVECONFIRM

0x05

Wave Confirm PDU

SNDC_TRAINING

0x06

Training PDU or Training Confirm PDU

SNDC_FORMATS

0x07

Server Audio Formats and Version PDU or Client Audio Formats and Version PDU

SNDC_CRYPTKEY

0x08

Crypt Key PDU

SNDC_WAVEENCRYPT

0x09

Wave Encrypt PDU

SNDC_UDPWAVE

0x0A

UDP Wave PDU

SNDC_UDPWAVELAST

0x0B

UDP Wave Last PDU

SNDC_QUALITYMODE

0x0C

Quality Mode PDU

SNDC_WAVE2

0x0D

Wave2 PDU

bPad (1 byte): An 8-bit unsigned integer. Unused. The value in this field is arbitrary and MUST be ignored on receipt.

BodySize (2 bytes): A 16-bit unsigned integer. If msgType is not set to 0x02 (SNDC_WAVE), then this field specifies the size, in bytes, of the data that follows the RDPSND PDU header. If msgType is set to 0x02 (SNDC_WAVE), then the representation of BodySize is explained in the Header field in section 2.2.3.3.