“RTMP study notes”的版本间的差异
free6d1823（讨论 | 贡献） |
free6d1823（讨论 | 贡献） |
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| 第58行： | 第58行： | ||
message type id | message type id | ||
| − | 1,2,3 | + | 1,2,3,5,6 for protocol control message |
8: audio | 8: audio | ||
9: video | 9: video | ||
| 第65行： | 第65行： | ||
message stream ID 0: control stream | message stream ID 0: control stream | ||
chunk stream ID 2: used in control stream | chunk stream ID 2: used in control stream | ||
| + | message type id | ||
| + | {| class="wikitable" style="width:100%" | ||
| + | ! ID !! Name !! Payload size !! Meaning | ||
| + | |- | ||
| + | || 1 || Set Chunk Size ||32 bits ||Set maximum chunk size (1~0x7FFFFFFF) | ||
| + | |- | ||
| + | || 2 || Abort Message || 32 bits ||chunk stream ID message to be discard | ||
| + | |- | ||
| + | || 3 || Acknowledgement || 32 bits || sequnce number, This field holds the number of bytes | ||
| + | received so far. | ||
| + | |- | ||
| + | || 5 ||Window Acknowledgement Size || 32 bits || inform the peer of the | ||
| + | window size to use between sending acknowledgments | ||
| + | |- | ||
| + | || 6 ||Set Peer Bandwidth || 32 + 8 bits|| sends this message to limit the output | ||
| + | bandwidth of its peer. | ||
| + | |} | ||
2020年4月5日 (日) 18:17的版本
Ref: https://www.adobe.com/devnet/rtmp.html
Handshaking Sequence
uninitialized ----
C0 -->
C1 -->
<-- S0 必须在 C0或C1 之后
<-- S1 必须在 C0或C1 之后
version sent -----
C2 -->
C2 必须在 S1之后
Ack sent -----
<-- s2 必须在C1之后
Handshake Done ----
data -->
data必须在S2之后
<-- data 必须在c2 之后
C0-> RTMP version 8 bits (=3)
<- S0 RTMP version 8 bit (=3)
C1,S1 1536 bytes
time[4]: stream 的参考基准时间 zero[4]:0 random bytes[1528] 乱数token
C2,S2 1536 bytes
time[4]: C2: S1 的时间; S2: C1 的时间 time2[4]: 读取S1/C1的时间 random bytes[1528]: C1/S1的乱数token
Chunk:
| Basic Header | Message Header | Extended Timestamp | Chunk Data |
+--------------+----------------+--------------------+--------------+
Basic Header: 1~3 bytes, Chunk Stream ID + chunk type
Message Header:0,3,7, or 11 bytes,message的type
Extended Timestamp: 0 or 4 bytes
Chunk header = Basic Header + Message Header + Extended Timestamp
Chunk data: variable size.
Chunk Stream ID: 3~65599,
0n = 64+n (64~319) 1mn = 64+m + n*256 (64~65599) n (n !=0,1,2 one byte) (3~63) 2 is reserved for level control
chunk type 高2位:format of Message header
Type 0: 11 byte 用于stream 开头 timestamp[3]: 发送时间, 0xffffff 使用Extended Timestamp [32bits] message length[3] message type id[1] message stream id[4] Type 1: 7 bytes timestamp delta[3] message length[3] message type id[1] Type 2: 3 bytes ID 与长度跟前个chunk 同 timestamp delta[3] Type 3: no message header. timestamp , ID 与长度跟前个chunk 同
message type id
1,2,3,5,6 for protocol control message 8: audio 9: video
Protocol Control Messages
message stream ID 0: control stream
chunk stream ID 2: used in control stream
message type id
| ID | Name | Payload size | Meaning |
|---|---|---|---|
| 1 | Set Chunk Size | 32 bits | Set maximum chunk size (1~0x7FFFFFFF) |
| 2 | Abort Message | 32 bits | chunk stream ID message to be discard |
| 3 | Acknowledgement | 32 bits | sequnce number, This field holds the number of bytes
received so far. |
| 5 | Window Acknowledgement Size | 32 bits | inform the peer of the
window size to use between sending acknowledgments |
| 6 | Set Peer Bandwidth | 32 + 8 bits | sends this message to limit the output
bandwidth of its peer. |
