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OmniTek OTR 1001 User Guide, v3.1
I-1
App. I
:
ANC Packet Descriptor Creation
In the ‘Extended View’ version of the DataView pixel data display (see Section G), ANC
packets are identified and interpreted by comparing the signal received against information
supplied as XML files stored alongside the OTR 1001 application. If an ANC packet is detected
that is not one of the types for which an XML descriptor file is provided, the message “No
Definition Found” will be displayed together with the embedded ID to allow separate
identification.
A range of XML files are supplied as part of the VIEW_DATA option. These files enable the
identification of a range of AES controls, SMPTE time codes and RP188 control codes. Users
may also add their own packet definitions through installing additional XML-format descriptor
files, for example to allow custom ANC packets to be decoded. Details are given below.
Note:
(i) The facility described below is limited to single ANC packets. It is not able to handle
information spread across multiple packets such as those used to deliver Dolby-E metadata.
(ii) Setting up these descriptor files is not a quick process as they effectively define how each bit
of the packet is to be handled, so before embarking on this process for an industry-standard ANC
packet, it is a good idea to check that you are not simply seeing this message because something
has happened to make the supplied XML files unavailable to the application. The application
directory within your program files should include an
ANCParser\XMLDefs
subdirectory and
this subdirectory should include a range of
.xml
files.
The format of ANC packets is defined by SMPTE 291. The format of the packet header is rigidly
defined by this standard. What is different between one packet type and another is the format of
the UDW block, so it is the structure of this block that the XML file principally defines, together
with a few items of header information such as the packet identifier. The detailed structure of the
packet header, EAVs and SAVs are of no concern here.
Overview
The format of the XML descriptor files is defined by the
.xsd
schema file included in the
ANCParser\XMLDefs
subdirectory. A single file can cover more than one type of packet, but
for maintenance purposes, it is advisable to limit the packets detailed in any XML file to ones
allied to same task or defined in the same specification.
The top level of the hierarchy in these XML files is a
Protocol
statement, which records the
name of the XML schema file that is used and gives an overall name to the set of packets
described by XML file.
Nested within the
Protocol
element are one or more
PacketType
elements. Each PacketType
element describes an individual packet among the ones defined for the selected protocol. The
PacketType
statement itself is principally used to specify the Data ID of the ANC packets being
described and to set the name that will be displayed on the Extended DataView screen where this
packet is identified within the video being analysed.
The detailed description of the block of UDWs within the packet is given by a series of
BitField
elements, where necessary interspersed with
Switch
elements and/or
BREAK
statements.
Summary of Contents for OTR 1001
Page 1: ...Advanced Measurement Technology OTR 1001 User Guide Software Version 3 1 October 2013...
Page 28: ...OmniTek OTR 1001 User Guide v3 1a A 16...
Page 52: ...OmniTek OTR 1001 User Guide v3 1 B 24...
Page 96: ...OmniTek OTR 1001 User Guide v3 1a E 24...
Page 116: ...OmniTek OTR 1001 User Guide v3 1 G 6...
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Page 358: ...OmniTek OTR1001 User Guide v3 1 U 12...
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Page 379: ...OmniTek OTR 1001 User Guide v3 1 I 15 Example XML Statements Example Result...
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