This is a free, open-source LRPT decoder. It reads samples from a 8-bit soft-QPSK file and outputs an image displaying the specified APIDs.
Features:
- Support for regular (72k) and interleaved (80k) modes
- Support for differential decoding
- Automatic RGB123/RGB125 composite output based on active APIDs
- APID 70 raw dump
- Native BMP output
- Optional PNG output (requires libpng)
- Split channels output
- Read samples from stdin (pass
-in place of a filename) - Ctrl-C at any point to write the image and exit (useful when decoding a stream of symbols)
mkdir build && cd build
cmake ..
make
sudo make install
By default, support for both BMP and PNG output formats will be compiled in,
provided that libpng is installed.
The output format will then be chosen based on the extension of the output image.
If you don't need PNG support, you can disable it by running
cmake -DUSE_PNG=OFF .. when configuring.
24.54% vit(avg): 1126 rs(sum): 28 APID 64 seq: 2009311 11:30:23.468
^ ^ ^ ^ ^ ^
file average Reed-Solomon current current VCDU timestamp
progress Viterbi path errors corrected APID sequence reported by the
length per (-1 if too many number satellite (MSK time)
byte (lower errors detected)
is better,
~1100 is usually enough
to get a decode)
meteor_decode [options] input.s
-7, --70 Dump APID70 data in a separate file
-a, --apid R,G,B Specify APIDs to parse (default: autodetect)
-B, --batch Batch mode (disable all non-printable characters)
-d, --diff Perform differential decoding
-i, --int Deinterleave samples (aka 80k mode)
-o, --output <file> Output composite image to <file>
-q, --quiet Disable decoder status output
-s, --split Write each APID in a separate file
-t, --statfile Write .stat file
-h, --help Print this help screen
-v, --version Print version information
Typical use cases:
- Meteor-M2, RGB123/125:
meteor_decode <input.s> -o <output.png> - Meteor-M2, RGB122:
meteor_decode <input.s> -o <output.png> -a 65,65,64