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bca - Binary Chroma Animation

BCA is a file format for time/frame based animations for Razer Chroma enabled devices.

A .bca file contains data for each frame wrapped in a package containing:

  • a frame header
  • a device header for each device in this frame
  • color data with row/column asignment for the specific device

For reading and playing these animations there is a C# project which uses Colore.

File Structure

File Header

Offset Bytes Datatype Name Description
0x00 2 uint16 fType ASCII Chars 'BA', 0x4241
0x02 4 uint32 fSize Whole file size
0x06 4 uint32 fReserved
0x0A 4 uint32 fBcaOffset Start of BCA content after file header

BCA Header

Offset Bytes Datatype Name Description
0x0E 4 uint32 hSize BCA header size
0x12 2 uint16 hVersion BCA file version = 1
0x14 4 uint32 hFrameOffset Offset to first frame
0x18 2 uint16 hFPS Frames per second
0x1A 4 uint32 hFrameCount Number of total frames
0x1E 2 uint16 hReserved

Frame Header

Offset Bytes Datatype Name Description
0x20 2 uint16 fhSize Frame header size
0x22 2 uint16 fhDeviceCount Number of devices in this frame
0x24 2 uint16 fhDataSize Size of all devices and their data in this frame

Device Header

Offset Bytes Datatype Name Description
0x26 1 uint8 dhSize Device header size
0x27 1 enum dhDataType 0-Assign color to all, 1-Assing color to row/col
0x28 2 enum dhDevice None, Keyboard, Keypad, Mouse, Mousepad, Headset
0x30 2 uint16 dhDataSize Size of data contained in this frame for this device

Device Data

Offset Bytes Datatype Name Description
0x32 1 uint8 dRow 0 on devices with only 1 row
0x33 1 uint8 dColumn Column
0x34 4 uint32 dABGR RGBa

License

Copyright © 2016 - 2018 Chroma Developer Community. Created by @blackworx & @wolfspiritm.

This project is licensed under the MIT license, please see the file LICENSE for more information.

Razer is a trademark and/or a registered trademark of Razer USA Ltd. All other trademarks are property of their respective owners.