pyrox.dev
1import ../make-test-python.nix (
2 { pkgs, ... }:
3 {
4
5 name = "timidity-with-vorbis";
6
7 nodes.machine =
8 { pkgs, ... }:
9 {
10 environment.systemPackages = with pkgs; [
11 (timidity.override { enableVorbis = true; })
12 ffmpeg # # for `ffprobe`
13 ];
14 };
15
16 testScript = ''
17 import json
18
19 start_all()
20
21 ## TiMidity++ is around and it claims to support Ogg Vorbis.
22 machine.succeed("command -v timidity")
23 machine.succeed("timidity --help | grep 'Ogg Vorbis'")
24
25 ## TiMidity++ manages to process a MIDI input and produces an Ogg Vorbis
26 ## output file. NOTE: the `timidity` CLI succeeds even when the input file
27 ## does not exist; hence our test for the output file's existence.
28 machine.succeed("cp ${./tam-lin.midi} tam-lin.midi")
29 machine.succeed("timidity -Ov tam-lin.midi && test -e tam-lin.ogg")
30
31 ## The output file has the expected characteristics.
32 metadata_as_text = machine.succeed("ffprobe -show_format -print_format json -i tam-lin.ogg")
33 metadata = json.loads(metadata_as_text)
34 assert metadata['format']['format_name'] == 'ogg', \
35 f"expected 'format_name' to be 'ogg', got '{metadata['format']['format_name']}'"
36 assert 37 <= float(metadata['format']['duration']) <= 38, \
37 f"expected 'duration' to be between 37s and 38s, got {metadata['format']['duration']}s"
38 '';
39 }
40)