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DEM format documentation

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Jordan Cristiano 2015-07-03 00:27:45 -04:00
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docs/DemFormat.md
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Source Engine DEM format
=======
This document applies to the version of TF2 as of July 1, 2015.
This document applies to the version of TF2 as of July 1, 2015.
Demo Protocol v3.
Network Protocol v24.
### DEM Format
#### DEM Format
The Source Engine DEM format at a high level:
[Demo Header]
@ -13,7 +15,7 @@ The Source Engine DEM format at a high level:
[Command Header = dem_stop]
~fin
### Demo Header
#### Demo Header
| Type | Name | Description | Example |
|------|------|-------------|---------|
| char[8] | Demo File Stamp | Demo file identifier. | "HL2DEMO" |
@ -30,14 +32,14 @@ The Source Engine DEM format at a high level:
Note: Examples are from a short demo recording, hence the 9 second playback time.
### Command Header
#### Command Header
| Type | Name | Description |
|------|------|-------------|
| int8 | Command Type | Type of the next command packet. |
| int32 | Tick | Game tick of the next command packet. |
### Command Type
| Type | Value | Description |
#### Command Type
| Name | Value | Description |
|------|-------|-------------|
| dem_signon | 1 | Signon packet. Same format as a network packet. |
| dem_packet | 2 | Network packet. |
@ -48,3 +50,65 @@ Note: Examples are from a short demo recording, hence the 9 second playback time
| dem_stop | 7 | Signals the end of demo messages. |
| dem_stringtables | 8 | Stringtables. |
#### Command Packets
##### dem_signon/dem_packet
| Type | Name | Description |
|------|------|-------------|
| democmdinfo_t | Demo Command Info | Describes view angles of the current point of view. |
| int32 | Sequence Number In | Input sequence number of packet. |
| int32 | Sequence Number Out | Output sequence number of packet. |
| RawData | Netpackets | RawData structure containing a series of netpackets. |
##### dem_synctick
Command Packet of size 0 bytes.
##### dem_consolecmd
| Type | Name | Description |
|------|------|-------------|
| char[1023] | Command String | Console command string of max length 1023 (including null char). |
Note: A typo in the code that writes out console commands likely meant for a string of length 1024 (including null char).
##### dem_usercmd
##### dem_datatables
##### dem_stop
Command Packet of size 0 bytes.
##### dem_stringtables
#### Types Appendix
##### Vector
| Type | Name | Description |
|------|------|-------------|
| float32 | x | |
| float32 | y | |
| float32 | z | |
##### QAngle
| Type | Name | Description |
|------|------|-------------|
| float32 | pitch | |
| float32 | yaw | |
| float32 | roll | |
##### Split_t
| Type | Name | Description |
|------|------|-------------|
| int32 | Flags | |
| Vector | View Origin | |
| QAngle | View Angles | |
| QAngle | Local View Angles | |
| Vector | View Origin 2 | |
| QAngle | View Angles 2 | |
| QAngle | Local View Angles 2 | |
##### democmdinfo_t
| Type | Name | Description |
|------|------|-------------|
| Split_t[1] | POV angles | Array of Split_t. Constant length of 1 for demo protocol 3. |
##### RawData
| Type | Name | Description |
|------|------|-------------|
| int32 | Size | Size in bytes of the following data chunk. |
| uchar[Size] | Data | Data chunk of Size bytes. |