IRIG106wiki

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~~ODT~~
===== IMAGE DATA =====

==== Type 0x48, Image Data, Format 0 (Image Data) ====

Image Data, Format 0 packets are used to record digitized video images. 
 
The layout of the CSDW is shown in Figure 6-42. The uLength value is the number 
bytes in each segment. The bIntraPckHdr flag indicated the presence of the intra-packet data 
header. The uSum value indicates if and how an image is segmented in the data packet. The 
uPart value indicates which part of a possibly segmented image is contained in the data packet. 

<code>
struct SuImageF0_ChanSpec 
    { 
    uint32_t    uLength         : 27;   // Segment byte length 
    uint32_t    bIntraPckHdr    :  1;   // Intra-packet header flag 
    uint32_t    uSum            :  2;   // 
    uint32_t    uPart           :  2;   // 
    }; 
</code>
 
<html><center><b>
Type 0x48 Image Data Format 0 CSDW
</b></center></html>

Individual image data messages follow the CSDW. Each message may have an optional 
intra-packet data header followed by the image data. The intra-packet data header, if present 
(indicated by bIntraPckHdr = 1), is an eight byte representation of time in either 48-bit 
relative time format derived from the RTC (format shown in Figure 6-5) , or as absolute time. If 
this time is absolute time, it is in either Chapter 4 weighted 48-bit time (format shown in 
Figure 6-6) or IEEE 1588 time format (format shown in Figure 6-7). 
 
The format of the image data portion of the packet is not specified in Chapter 10. The 
image format is specified in the TMATS setup record attribute “R-x\SIT-n”. Note that an 
even number of bytes is allocated for message data. If the data contains an odd number of bytes, 
then one unused filler byte is inserted at the end of the data. 
 
Chapter 10 of IRIG 106-07 (and prior editions of the standard) incorrectly state that Bit 7 
of the Packet Flags (in the packet header) is used to determine if the intra-packet time is relative 
time or absolute time. The correct bit to use is Bit 6. This handbook is based on (and correlates 
to) the IRIG 106-07 edition; however the "bit 7" error will be corrected in future releases of this 
handbook. 

----

==== Type 0x49, Image Data, Format 1 (Still Imagery) ====

Image Data, Format 1 packets are used to record digitized still images. Several formats for 
image compression are supported by Format 1.

The layout of the CSDW is shown in Figure 6-43. The uFormat value indicates the 
format of the image data. The bIntraPckHdr flag indicated the presence of the intra-packet 
data header. The uSum value indicates if and how an image is segmented in the data packet. 
The uPart value indicates which part of a possibly segmented image is contained in the data 
packet. 
 
<code>
struct SuImageF1_ChanSpec 
    { 
    uint32_t    uReserved       : 23;   // 
    uint32_t    uFormat         :  4;   // Image format 
    uint32_t    bIntraPckHdr    :  1;   // Intra-packet header flag 
    uint32_t    uSum            :  2;   // 
    uint32_t    uPart           :  2;   // 
    }; 
</code>
 
<html><center><b>
Type 0x49 Image Data Format 1 CSDW
</b></center></html>

Individual image data messages follow the CSDW. Each message may have an optional 
intra-packet data header (indicated by bIntraPckHdr = 1) followed by the image data. The 
format of the intra-packet data header is shown in Figure 6-44. The suIntrPckTime value is 
an eight byte representation of time in either 48-bit relative time format derived from the RTC 
(format shown in Figure 6-5) , or as absolute time. If this time is absolute time, it is in either 
Chapter 4 weighted 48-bit time (format shown in Figure 6-6) or IEEE 1588 time format (format 
shown in Figure 6-7). The uMsgLength value indicates the length of the following still image or 
segment. 
 
<code>
struct SuImageF1_Header 
    { 
    uint64_t    suIntraPckTime;         // Reference time 
    uint32_t    uMsgLength;             // Message length 
    }; 
</code>
 
<html><center><b>
Type 0x49 Image Data Format 1 intra-packet header
</b></center></html>

Chapter 10 of IRIG 106-07 (and prior editions of the standard) incorrectly state that Bit 7 
of the Packet Flags (in the packet header) is used to determine if the intra-packet time is relative 
time or absolute time. The correct bit to use is Bit 6. This handbook is based on (and correlates 
to) the IRIG 106-07 edition; however the "bit 7" error will be corrected in future releases of this 
handbook. 

----
 
==== Type 0x4A - 0x4F, Image Data, Format 2 - Format 7 ====

Reserved for future use.