Started documenting the dem format
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docs/DemFormat.md
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Source Engine DEM format
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=======
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This document applies to the version of TF2 as of July 1, 2015.
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### DEM Format
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The Source Engine DEM format at a high level:
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[Demo Header]
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[Command Header][Command Packet]
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[Command Header][Command Packet]
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...
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[Command Header = dem_stop]
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~fin
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### Demo Header
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| Type | Name | Description | Example |
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|------|------|-------------|---------|
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| char[8] | Demo File Stamp | Demo file identifier. | "HL2DEMO" |
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| int32 | Demo Protocol | Demo protocol version. | 3 |
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| int32 | Network Protocol | Network protocol version. | 24 |
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| char[260] | Server Name | Name of the server that recorded this demo. | "Team Fortress" |
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| char[260] | Client Name | Name of the client that recorded this demo. | "SourceTV Demo" |
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| char[260] | Map Name | Name of the map where this demo was recorded. | "cp_granary" |
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| char[260] | Game Directory | Game directory relative to hl2.exe | "tf" |
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| float32 | Playback Time | Length of the demo in seconds. | 9.05999947 |
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| int32 | Playback Ticks | Length of the demo in ticks. | 604 |
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| int32 | Playback Frames | Length of the demo in frames. | 151 |
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| int32 | Signon Length | Length of the signon data in bytes. | 640166 |
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Note: Examples are from a short demo recording, hence the 9 second playback time.
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### Command Header
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| Type | Name | Description |
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|------|------|-------------|
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| int8 | Command Type | Type of the next command packet. |
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| int32 | Tick | Game tick of the next command packet. |
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### Command Type
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| Type | Value | Description |
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|------|-------|-------------|
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| dem_signon | 1 | Signon packet. Same format as a network packet. |
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| dem_packet | 2 | Network packet. |
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| dem_synctick | 3 | Signals the client to sync clock to demo tick. |
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| dem_consolecmd | 4 | Console command. |
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| dem_usercmd | 5 | User input command. |
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| dem_datatables | 6 | Network data tables. |
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| dem_stop | 7 | Signals the end of demo messages. |
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| dem_stringtables | 8 | Stringtables. |
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