Quicktime File Format (2012-08-14).pdf

Media Data Atom TypesPacketization Hint Sample Data for Data Format 'rtp 'Additional dataA variable length field containing data pointed to by the entries in the data table.The packet entry contains the data elements listed in Table 4-21 (page 260).Table 4-21Packet entry data elementsPacket entryRelative packet transmission timeRTP header infoRTP sequence numberFlagsEntry countExtra information TLVsData tableBytes422220 or variablevariableRelative packet transmission timeA 32-bit signed integer value, indicating the time, in the hint track’s time scale, to send this packet relativeto the hint sample’s actual time. Negative values mean that the packet will be sent earlier than real time,which is useful for smoothing the data rate. Positive values are useful for repeating packets at later times.Within each hint sample track, each packet time stamp must be non-decreasing.RTP header infoA 16-bit integer specifying various values to be set in the RTP header. The bits of the field are defined asfollows.0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5reserved P X reserved M payload typeThe RTP header information field contains the elements listed in Table 4-22 (page 260).Table 4-22RTP header information elementsFieldPBit#2DescriptionA 1-bit number corresponding to the padding (P) bit in the RTP header. Thisbit should probably not be set, since a server that needs different packetpadding would need to unpad and repad the packet itself.2012-08-14 | © 2004, 2012 Apple Inc. All Rights Reserved.260