FujiFilm compressed RAF support (X-Pro2, more cameras expected)

[LibRaw]

We just opensourced X-Pro2 compressed decoder created /reverse-engineered by Alexey Danilchenko and contributed to LibRaw.

Here is the code:

• as branch: https://github.com/LibRaw/LibRaw/tree/xtrans-compressed
• as single commit: https://github.com/LibRaw/LibRaw/commit/aeab4d8ea58f85050d1253bdc41f51baa79ffe65

The code is written 'as separate from LibRaw as possible' to easy adaptation in other software. There are four points of interaction:

• parse_xtrans_header() is called if data size is not width_height_2 (so, not uncompressed format), it checks fields in compressed data block start and sets four variables (libraw_internal_data.unpacker_data.fuji_*) for further re-use.
• xtrans_compressed_load_raw() called after raw buffer allocation and performs decoding. It calls
  • xtrans_decode_loop() which, in turn calls
  • xtrans_decode_strip(). xtrans_decode_loop() may be converted to parallel calls (if locking is implemented in file reading to make sure seek/read pairs works as expected)
• File read is performed in fuji_fill_buffer()
• And copying decoded data to place is in copy_line_to_xtrans()

The code works faster than Fuji's SDK (used by Adobe, Irridient, Silkypix) even in single-thread mode.

So, feel free to include this into RawSpeed.

[lucashungaro]

Will this be added soon?

[LebedevRI]

@lucashungaro As soon as someone with coding knowledge, free time, and interest in the subject 'ports' the code.

[mherke]

a lot of fuji shooters would love to see this implemented. hope it will be added soon :)

[lucashungaro]

@LebedevRI oh, I see. I misunderstood it was "ready", just waiting for integration.

[kanru]

I'm going to work on this soon. I've created some work in progress code.

[MtP76]

Looks like some work where done here: https://github.com/muessel/rawspeed