DAP Technology 1394, Operation Manual

Page: 370 / 458

File Formats
370 Copyright © DapTechnology B.V., 2005-2019 - All Rights Reserved., 5/20/2019
The block header is one 32-bit value.
The upper 12 bits define a block id and the lower 20 bits define the length of the block data in bytes.
If the length is not a multiple of 4 bytes, the block data is padded with zero-value bytes.
The only block type defined at this moment is a packet block it has a block id of 0, the specified length in
the header equals the number of packet bytes and the block data consists of the packet quadlets.
example
The following (32-bit) values define a packet file with two isochronous packets, the first is 8 bytes long and
the second is 20 bytes long.
value----------remarks----------------------------------
0x705346AE file id
0x00000100 version
0x00000008 block header (packet block with length 8)
0x000001A0 packet bytes 1-4
0x1BCDB556 packet bytes 5-8
0x00000014 block header (packet block with length 20)
0x000800A0 packet bytes 1-4
0xC71110B2 packet bytes 5-8
0x0178006A packet bytes 9-12
0x8080FFFF packet bytes 13-16
0x6719CF8D packet bytes 17-20
Note that the file is a binary file. The quadlets of the example above are stored binary. The example file
will be 44 bytes long (11 quadlets)
23.4. Recorder Regeneration file
Recorder Regeneration File Definition
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
File ID
Reserved for future use TF File Version
Fields
Items
File ID: Fixed value of 0xAE52476E (32 bits)
TF: Time Format (3 bits)
0: No time field
1: Absolute time field (64 bits)
2: Frame/Cycle Offset time field - Selected if "Time Offset from STOF" is checked. (32 bits)
File Version: Currently 1 (8 bits)
Fields: List of Fields, end is indicated with 0
Items: List of Items, end is indicated with 0
Field Definition
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
C Size Field Type ID
Number (indicated by Size) of data Quadlets
C: Custom Field Indicator (1 bit)
0: Dap Field Definition
1: User-defined Custom Field Definition
Size: Number of Data Quadlets
Filed Type ID: 0 - Empty field (last one in list)