Sd image data file format – Grass Valley Switcher Products User Manual
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Switcher Products — Protocols Manual
Section 6 — Still Store Image File Format
SD Image Data File Format
The Kalypso and Zodiak SD still store image data format reflects the orga-
nization of the still store memory used to rasterize images. This is a raw
data file without any headers or embedded information – just the pixels
(and also in some cases “pad” bytes of “0” to fill the remaining portion of a
line or a field). The still store expects a specific organization of information
in this file based on the contents of the metadata file.
Six 10-bit video (or key) pixels (twelve values: Y plus half bandwidth Cb
and Cr) are packed into four 32-bit values as shown in
:
Table 117. SD Still Store Image Data
Note that the sample numbers for Cb and Cr show only odd numbered
samples. This is based on discarding half of the full bandwidth chromi-
nance samples (the even numbered samples). If Cb and Cr have already
been down sampled, do not discard samples.
All images must begin in field 1 of the frame and include both fields.
Incomplete lines (half line blanking at the top or bottom of the screen) must
be extended with active pixels (black is OK).
Cb and Cr words should be set to 512 (no color) for black and white video
or key signals.
Where a key signal exists, a frame (two fields) of video is followed by a
frame of key.
When the image is a video only animation, frames are stacked back to back.
When the image is a video + key animation, video and key are interleaved.
That is video field 1, video field 2, key field 1, key field 2, video field 3, etc.
shows the amount of information written to the data
file per frame:
8063_04_08_r0
31
22 21
12 11
2 1
0
DWORD 0
Cb 3
Cr 1
00
Cb 1
DWORD 1
Cr 5
Cb 5
00
Cr 3
DWORD 2
Y 3
Y 2
00
Y 1
DWORD 3
Y 6
Y 5
00
Y 4