This little tool converts PBM bitmaps to a byte stream that can be written to the display buffer in the r0ket badge. To learn more about the r0ket badge, see [their homepage] 1. It will work on Linux only for now, I think, since it uses [golzo] 2 for doing (optional) LZO compression. You can use this compression in an [LZO enhanced] 2 r0ket firmware. However, uncompressed output is supported by the basic r0ket firmware as-is.
I think the software is restricted to Linux for now (liblzo/cgo usage). Note that you need to have Go language support installed.
Then you should be able to just do:
goinstall github.com/hwhw/img2r0ket
img2r0ket will read from standard input by default and output to standard output. It will accept the following options:
-i specifies an input file
-o specifies an output file
-x will make img2r0ket invert pixel data
-L will make img2r0ket emit compressed output, prepended by a two-byte, lower endian formatted short number that specifies the number of compressed bytes that follow. If this number is 0, then the block could not be compressed and will follow uncompressed in full length.
Create a single uncompressed image
pngtopnm test.png | pamscale -xyfill 96 68 | ppmtopgm | pnmnorm | pamditherbw | img2r0ket -x > TEST.IMG
This would produce a LZO compressed image stream suitable for "playing" on the r0ket:
mkdir frames
ffmpeg -ss '00:00:41' -vframes 850 -i /somevideo.avi -f image2 -r 12.5 -s 112x68 "frames/%08d.pgm"
ls -1 frames/ | while read f; do \
cat "frames/$f" | \
pamcut 8 0 96 68 | \
pnmnorm | \
pamditherbw | \
pamtopnm | \
img2r0ket -x -L | \
cat >> LZOTEST.VID;
done
rm -rf frames
The software is free software, licensed under a MIT-style license. See the LICENSE file for the terms.