Network Q RAC Rally FMV

This is a video format used for the cutscenes in the game.

File header:

 4 bytes - "DANI"
 2 bytes - always 0x0503?
 2 bytes - number of frames
 2 bytes - width
 2 bytes - height
 4 bytes - suggested video buffer size
 1 byte  - bits per audio sample
 1 byte  - audio channels
 2 bytes - sampling rate
 4 bytes - always zero?

Then a palette chunk follows:

 4 bytes - "CMAP"
 4 bytes - palette size
 N bytes - palette

In case of audio being present, it is stored all in the following chunk:

 4 bytes - "SNDT"
 4 bytes - audio size
 N bytes - audio

Video data is stored in "DLTA" chunks with 32-bit chunk length. "ENDA" marker (without size) signals end of file.

Video compression

Video is split into 4x4 blocks and uses variable-length codes to signal block type. Those codes consist of the bits that are grouped into bytes and interspersed among data bytes.

The codes are:

• 0xxx - pattern fill with 1-8 colours. For each pixel in the block a code is read telling which colour to pick. E.g. for 4-colour pattern it's two-bit code, for 1 colour it is no code at all, and for 7-colour code it is 00 010 011 100 101 110 111;
• 10 - raw block
• 110 - skip block
• 1110 - row end marker (should appear after the last block in the row)
• 1111 - frame end marker (should appear after the last block instead of row end marker)