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add continuation packet

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Add continuation type packet that would make it possible to send
commands using a piece of shared memory.
This commit is contained in:
Wim Taymans 2015-08-31 17:10:44 +02:00
parent 8d1ad2ea63
commit fd276b4820
2 changed files with 31 additions and 13 deletions
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31
doc/design.txt
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@ -55,18 +55,27 @@ Wire
Fixed header
<version> : 4 bytes : total message length
<version> : 4 bytes : message version
<length> : 4 bytes : total message length
Followed by 1 or more type-length-data sections
<type> : 1 byte
<length> : variable length, 7 bits, hight bit is continuation marker
<length> : variable length, 7 bits, high bit is continuation marker
<data> : <length> bytes, see below for contents based on <type>
Types:
1: header
1: continuation section
Rest of the commands can be found in the shared memory region at
@offset and @size. A shared memory region is negotiated when the client
connects to the server.
<offset> : 8 bytes : offset
<size> : 8 bytes : size
2: header
Header for payload
@ -75,27 +84,33 @@ Types:
<pts> : 8 bytes : presentation time
<dts-offset> : 8 bytes : dts-offset
2: fd-payload section
3: fd-payload section
Used to send a buffer between client and server.
Used to send a block of data between client and server. The type of fd and
the possible operations on it are negotiated when the client connects.
<id> : 4 bytes : id of the fd-payload
<offset> : 8 bytes : offset
<size> : 8 bytes : size
<fd-index> : 4 bytes : index of fd
3: release fd-payload
4: release fd-payload
Release a fd-payload with <id>
<id> : 4 bytes : the id number of the released fd-payload
4: format change
5: format change
Perform an in-band format change. The following data blocks will be in this
new format.
<format-id> : 1 byte : format id
<format> : 0-terminated : contains serialized format
5: property changes
6: property changes
Notify a property change.
<key> : 0-terminated : key
<value> : 0-terminated : value