RFC 3497 (rfc3497) - Page 3 of 12

RTP Payload Format for Society of Motion Picture and Television Engineers (SMPTE) 292M Video

RFC 3497        RTP Payload Format for SMPTE 292M Video       March 2003


         0       20      40      60     80       0      20      40
         +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+       +-+-+-+-+-+-+-+-+
         |3FF| 0 | 0 |XYZ|LN1|LN2|CR0|CR1|       |3FF| 0 | 0 |XYZ|
         +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+       +-+-+-+-+-+-+-+-+
                  

                        Figure 2. Timing reference format.

         +---------------------------------------------------------+
         |      (MSB)                                        (LSB) |
         | Word    9    8    7    6    5    4    3    2    1    0  |
         +---------------------------------------------------------+
         | 3FF     1    1    1    1    1    1    1    1    1    1  |
         | 000     0    0    0    0    0    0    0    0    0    0  |
         | 000     0    0    0    0    0    0    0    0    0    0  |
         | XYZ     1    F    V    H    P    P    P    P    P    P  |
         +---------------------------------------------------------+
         | NOTES:                                                  |
         |     F=0 during field 1; F=1 during field 2.             |
         |     V=0 elsewhere; V=1 during field blanking.           |
         |     H=0 in SAV; H=1 in EAV.                             |
         |     MSB=most significant bit; LSB=least significant bit.|
         |     P= protected bits defined in Table 2 of SMPTE 292M  |
         +---------------------------------------------------------+

                      Table 1: Timing reference codes.

         +---------------------------------------------------------+
         |      (MSB)                                        (LSB) |
         | Word    9    8    7    6    5    4    3    2    1    0  |
         +---------------------------------------------------------+
         |  LN0    R    L6   L5   L4   L3   L2   L1   L0   R    R  |
         |  LN1    R     R    R    R   L10  L9   L8   L7   R    R  |
         +---------------------------------------------------------+
         | NOTES:                                                  |
         |    LN0 - L10 - line number in binary code.              |
         |    R = reserved, set to "0".                            |
         +---------------------------------------------------------+

                      Table 2: Line number data.

   The number of words and the format for active lines and line blanking
   is defined by source format documents.  Currently, source video
   formats transfered by SMPTE 292M include SMPTE 260M, 295M, 274M and
   296M [5-8].  In this memo, we specify how to transfer SMPTE 292M over
   RTP, irrespective of the source format.





Gharai, et al.              Standards Track