Bit
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... encoders,
VTRs, etc.). SMPTE 292M stipulates that the source data be in 10 bit
words and the total data rate be either 1.485 Gbps or 1.485/1.001
Gbps.
...
...
It is to be noted that SMPTE 292M streams have a constant high bit
rate and are not congestion controlled. Accordingly, use of this
payload format ...
... active line.
The EAV and SAV are made up of three 10 bit words, with constant
values of 0x3FF 0x000 0x000 and an additional word (designated as XYZ
in figure 2), carrying a number of flags. This includes an F flag
...
... also a V flag which indicates field blanking. Table 1, further
displays the code values in SAV and EAV. After EAV, are two words,
LN0 and LN1 (Table 2), that carry the 11 bit line number for the
SMPTE 292M line. The Cyclic Redundancy Check ...
... | H=0 in SAV; H=1 in EAV. |
| MSB=most significant bit; LSB=least significant bit.|
| P= protected bits ...
... | MSB=most significant bit; LSB=least significant bit.|
| P= protected bits defined in Table 2 of SMPTE ...
... significant bit; LSB=least significant bit.|
| P= protected bits defined in Table 2 of SMPTE 292M |
+---------------------------------------------------------+
...
... payload header pertains to the first data sample
in the packet. The end of a video frame (the packet containing the
last sample before the EAV) is marked by the M bit in the RTP header.
...
... RTP sequence number, thereby extending the sequence number to 32 bits
and enabling RTP to accommodate HDTV ...
... HDTV's high data rates. At 1.485
Gbps, with packet sizes of at least one thousand octets, 32 bits
allows for an approximate 6 hour period before the sequence number
...
... allows for an approximate 6 hour period before the sequence number
wraps around. Given the same assumptions, the standard 16 bit RTP
sequence number ...
... identified in the SMPTE 292M stream. At 148.5 MHz, the 32 bit
timestamp wraps around in 21 seconds.
...
...
The payload header also carries the 11 bit line number from the SMPTE
292M timing signals. This provides more information at the
...
... containing the EAV is lost.
The bit length of both timing signals, SAV and EAV+LN+CRC, are
multiples of 8 bits ...
... bit length of both timing signals, SAV and EAV+LN+CRC, are
multiples of 8 bits, 40 bits and 80 bits, respectively, and therefore
...
... CRC, are
multiples of 8 bits, 40 bits and 80 bits, respectively, and therefore
are naturally octet aligned.
...
... multiples of 8 bits, 40 bits and 80 bits, respectively, and therefore
are naturally octet aligned.
...
... Y3 Y4 Cr Cb, and video content should be packetized such that these
values are not fragmented across 2 packets. However, with 10 bit
words, this is a 60 bit value which is not octet aligned. To be both
...
... values are not fragmented across 2 packets. However, with 10 bit
words, this is a 60 bit value which is not octet aligned. To be both
octet aligned, and adhere to ALF, an ALF ...
...
+-------------------------------------------------------+
| Color 10 bit |
|Subsampling Pixels words aligned on octet# pgroup|
...
... | V |P|X| CC |M| PT | sequence# (low bits) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| time stamp ...
... | ssrc |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| sequence# (high bits) |F|V| Z | line no |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
...
... timestamp, respectively. This allows for a unique timestamp
for each 10 bit word.
Marker bit ...
... Marker bit (M): 1 bit
The Marker bit denotes the end of a video frame, and is set to 1
for the last packet of the video frame and is otherwise set to 0
for all other packets.
...
... RTP sequence number is augmented with another 16 bits in the
payload header in order to accommodate the 1.485 Gbps data rate of
...
... F: 1 bit
The F bit as defined in the SMPTE 292M timing signals (see Table
1). F=1 identifies field 2 and F=0 identifies field 1.
...
... 1). F=1 identifies field 2 and F=0 identifies field 1.
V: 1 bit
The V bit as defined in the SMPTE ...
... V: 1 bit
The V bit as defined in the SMPTE 292M timing signals (see Table
1). V=1 during field blanking, and V=0 else where.
...
... 1). V=1 during field blanking, and V=0 else where.
Z: 2 bits
SHOULD be set to zero by the sender ...
... SMPTE 292M stream (see Table 2). The line number MUST correspond
to the line number of the first 10 bit word in the packet.
...
... Optional parameters: pgroup
The RECOMMENDED grouping for aligning 10 bit words and octets.
Defaults to 1 octet, if not present.
...
... Society of Motion Picture and Television Engineers, Bit-Serial Digital Interface for High-Definition Television Systems, SMPTE ...
... Society of Motion Picture and Television Engineers, Digital Representation and Bit-Parallel Interface - 1125/60 High- Definition Production System, SMPTE 260M-1999. ...