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In the RV30 format, another encapsulated data layer for the video stream
has been introduced. In lack of a name I'll call them sub packets, the
normal packets which exist in RV10 I'll call - well - packets. The stream
of bytes which is put in one memory block is named block.
The format extension has been * by wild guessing and comparing the
received data between the original viewer and the demuxer.
Every packet may contain one or more sub packets, and one block may
be contained inside one or more adjacent (sub) packets.
A sub packet starts with a small header (two letters are one byte):
aa(bb)[ccccdddd{eeee}ff]
aa: indicates the type of header
the 2MSB indicate the header type (mask C0)
C0: the [] part exists, but not ()
00, 80: the data block is encapsulated inside multiple packets.
bb contains the sequence number, beginning with 1.
80 indicates the last sub packet containing data for the
current block. no C0 or 40 sub packet follows until
the block has been finished with a 80 sub packet.
No packet with another stream than the current video stream
is inside the sub packet chain, at least I haven't seen
such case - the demuxer will shout in this case.
40: [] does not exist, the meaning of bb is unknown to me
data follows to the end of the packet
mask 3F: unknown
bb: unknown
cccc: mask 3FFF: length of data
mask C000: unknown, seems to be always 4000
dddd: when it's 0, {} exists (only in this case)
mask 3FFF: I thought it would have been the offset inside the
block, is not correct in every case. Just appending the
data works better, ignoring it.
mask C000: like cccc, except the first case
eeee: only exists when dddd exists and is zero. contains the data
dddd should contain in the second case. don't know what the developers
had in mind.
ff: sequence number for the data blocks, beginning with 0
packet header:
ushort unknown
ulong blocksize
ushort streamid
uchar reserved
uchar flags 1=reliable, 2=keyframe
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