參數(shù)資料
型號(hào)： ZR36504
廠商： Electronic Theatre Controls, Inc.
英文描述： Video & Audio Interface solution via USB
中文描述： 視頻
文件頁(yè)數(shù)： 41/74頁(yè)
文件大?。?/td> 298K
代理商： ZR36504
ZORAN Corporation
USBvision II Data Decoder
ZR36505 Data Sheet
November-99
Page 41 of 41
USB Pipe Video Data Format
Data Packets:
The Video data is received by the host computer as a stream of bytes via End-Point 2
Isochroneous pipe. There is an incoming data packet every 1ms (every USB-Frame), and
its size is limited by the maximum bandwidth that was initially set for End-Point 2; The
maximum byte-count for each packet is one of the following numbers: 959 (for 7.5Mb/sec),
895, 831, 767, 703, 639, 575, 511, 447, 383, 319, 255, 191, 127, or 63 (for 0.5Mb/sec).
Regarding the data on the USB - the data of a new Video-Frame always starts in a new
data packet, so in most cases the last packet of a video frame is shorter than a normal
packet. The ZR36504 sends one ore more empty packets between every two video frames.
Video Frame Synchronization:
In all modes of operation (Compressed or Raw video) two concurrent Video Frames will
be separated by at least one empty Data Packet. This is used by the ZR36504 S/W driver
to detect a Start-Of-Video-Frame. Also, the first two bytes of the Video Frame Header
contain a Start-Of-Video-Frame-Pattern (=0xAA55), which are used by S/W driver as a
qualifier to verify that the data represents an uncorrupted Video-Frame.
Video Frame Header:
Every Video Frame has a header that comes first. The header data is organized in Little-
Endian format; That's to say, the LSB of a 2-bytes parameter comes prior to the MSB
(LSB occupies the lower address). The same header format is used in all modes of
operation. The following table specifies the parameters of this header:
Offset
Param. Name
No. of
Bytes
0
Vid_Frm_Patt
2
0xAA55 = Start of Video-Frame Pattern
2
Header_Length
1
Number of bytes in this header = 12
3
Frame_Numb
1
D4-D0: Unsigned integer. Incremented (mod 32) on every frame that
is delivered to host computer.
D7: Capture_Pressed (active if '1').
D6: Resumed ('1': first frame after Suspend)
D5: spare
4
Frame_Phase
1
D4-D0: Unsigned integer. Incremented mod 30 on every frame that is
acquired from camera.
D7-D5: spare
5
Frame_Latency
1
Unsigned integer. Number of milliseconds elapsed from the moment
that the camera began delivery of this frame to ZR36504, to the
moment that the ZR36504 began delivery of frame-header to USB.
6
Data_Format
1
D7: '0'=Vendor Specific (like ZR36504)
( '1'=Class Specific )
D6: '0'=Raw Data, '1'=Compressed Data
D5-D0: Vid_Format_Code:
0x03 = YUV-4:2:2
0x14 = YUV-4:2:0 Planar
0x06-0x12, 0x15-0x1F = spare
0x20 = Zoran's Compression
7
Format_Param
1
D7: Intra_Frame ('1'=Intra, '0'=Inter+Intra). This bit should be
ignored in raw data frames.
D6: spare
Description & Specification
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