audioTrackUID

Description

The audioTrackUID uniquely identifies a track or asset within a file or recording of an audio scene. This element contains information about the bit depth and sample rate of the track. It also contains sub-elements that allow the model to be used for non-BW64 applications by performing the job of the 'chna' chunk. When using the model with MXF files the audioMXFLookUp sub-element (which contains sub-elements to refer to the audio essences in the file) is used.

Example

<audioTrackUID UID="ATU_00000001" sampleRate="48000" bitDepth="24">
  <audioTrackFormatIDRef>AT_00010001_01</audioTrackFormatIDRef>
  <audioPackFormatIDRef>AP_00010002</audioPackFormatIDRef>
</audioTrackUID>

Attributes

Attribute	Description	Example	Required
UID	The actual UID value	ATU_00000001	Yes
sampleRate	Sample rate of track in Hz	48000	Optional
bitDepth	Bit depth of track in bit	24	Optional

Sub-elements

Element	Description	Example	Quantity
audioMXFLookUp	See audioMXFLookUp sub-section		0 or 1
audioTrackFormatIDRef	Reference to an audioTrackFormat description	AT_00010001_01	0 or 1
audioPackFormatIDRef	Reference to an audioPackFormat description	AP_00010002	0 or 1

audioMXFLoopUp sub-elements

MXF has different meanings for the terms ‘track’ and ‘channel’ from their use in the ADM. In MXF ‘track’ is the storage medium containing audio or video, and for audio this ‘track’ can be sub-divided into ‘channels’.

Element	Description	Type	Example
packageUIDRef	Reference to an MXF package UMID	string	urn:smpte:umid:060a2b34.01010105.01010f20.13000000.540bca53.41434f05.8ce5f4e3.5b72c985
trackIDRef	Reference to an MXF track	int	MXFTRACK_3
channelIDRef	Reference to a channel track	int	MXFCHAN_1