Andre,
Andre Kirchner a écrit :
Hi all,
Regarding the RTMP protocol, how is a response associated with a request?
I understood, for example, that when a createStream command with chunkID 5 (I'm
referring By ChunkID to bits 0-5 of the first byte of the header) is send to
the flash media server, it will respond with a _result message with chunkID 5.
But at least when wowza is the flash media server used, all _result messages
have chunkID 3.
I believe you are doing the same confusion I made when I first start to
try to understand how RTMP messages are implemented. :) I made a
confusion between Chunk Stream ID (csid) and Stream ID (sid). They are
two different things.
You will get the csid for each chunk from chunk basic headers stored in
1, 2 or 3 bytes : 1 byte if chunk stream id is between 2 and 63
(remember csid #2 is reserved for low level rtmp messages), 2 bytes if
csid is between 64 and 319 (first byte is like ??000000, the csid is
computed as follow: second byte + 64), 3 bytes if csid is between 64 and
65599 (first byte is like ??000001, the csid is computed as follow:
third byte * 256 + second byte + 64). Note: csid between 64 and 319 may
be also stored on 3 bytes (third byte set to 0), but this may be one
extra byte used for nothing. Next to the chunk basic header is the chunk
message header 11, 7, 3 or 0 bytes long depending of chunk type.
The chunk type if stored in the first two bits of the first byte. The
two first bits (??xxxxxx) of the first byte will inform you if chunk is
type 0 (00xxxxxx), 1 (01xxxxxx), 2 (10xxxxxx) or 3 (11xxxxxx). If type
is 0, chunk message is 11 bytes long and you will get the sid (not
csid) from bytes 8 to 11 after you removed If type is 1, 2 or 3, then
chunk message header will be 7, 3 or zero bytes long respectivly. In
type 1, 2 or 3 the sid is not mentionned. You must refer to the previous
chunks (based on csid) as the stream ID remains the same. This also
means you must send or receive a 0-typed chunk before sending or
receiving 1, 2 or 3-typed chunks.
With this stream ID you can determine what is the _result message
targeted to.
Hope this helps ! :)
Cheers.
--
Max.
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