Redsea 1.2.0

[windytan]

RDS2 streams + station logo decoding

Redsea can now receive the extra data streams 1, 2, and 3 introduced in RDS 2 (#32, #127, #102) . It is 3–4x more work for the CPU so this feature is not enabled for MPX input by default; Use the option --streams to enable it.

The streams are often used to send small files, most often the station logo. Redsea prints these files along the normal JSON output. When a file is fully received, the JSON field rft.data.file_contents contains the entire file as base64 (see wiki).

Sometimes these lines will get very long and copy-pasting from terminal is not easy. You can use this string of commands to save the first file found in a pre-recorded signal to disk:

redsea --streams -f input_file.wav |\
  grep file_contents |\
  head --lines=1 |\
  jq --raw-output .rft.data.file_contents |\
  base64 --decode > rft_file.bin

Then use the command file --extension rft_file.bin to find out the image format; and rename the file appropriately so you can open it.

Streams as hex

We made the hex formatting of these streams hopefully compatible with RDS Spy. This format is used both for hex input and output.

49B1 219F 2020 2020
#S1 2008 467D D653 7C9B
#S2 2008 45D9 389B 79A8
#S3 2008 47D6 CE07 06F7
49B1 F181 7A65 2031
...

Currently, RDS2 streams are not supported for ASCII binary or TEF input. The CRC is not currently checked at all.

Other changes

• Show RadioText A/B flag with --show-partial
• Improve CSV loading speed
• Removed schema.json (it's not maintained) - the same information is now in the wiki

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This discussion was created from the release Redsea 1.2.0.