feat(player): add tracker module playback (.mod/.s3m/.xm/.it) - #423
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djs55 wants to merge 5 commits into
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feat(player): add tracker module playback (.mod/.s3m/.xm/.it)#423djs55 wants to merge 5 commits into
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libopenmpt can decode all these formats. There didn't seem to be a Go binding for it already, but we can drive it via purego, which conveniently is already an indirect dependency (via 'oto') If the openmpt library isn't available then we don't register the file types. Tests build a minimal synthetic MOD file in-memory (no fixture files, no licensing questions) and verify against the real libopenmpt: Open/Close, duration, seeking, garbage-file rejection, and that rendered output is actually audible - plus that decodeWithExt routes .mod/.s3m/.xm/.it to the new decoder and that decodeOpenmpt closes its source reader exactly once. Tested manually with: - https://modarchive.org/index.php?request=view_by_moduleid&query=35344 - https://modarchive.org/index.php?request=view_by_moduleid&query=154991 Error messages: - decodeOpenmpt's "libopenmpt not found" error now uses a new openmptInstallHint(), mirroring the existing ffmpegInstallHint pattern in ytdl.go, instead of a hardcoded apt/brew/pacman string. Packaging - libopenmpt is a runtime-only dependency (loaded via dlopen, never linked), so unlike the CGo-linked audio libraries it needs no build-time change anywhere, but does need to be actually findable at run time: - nix/package.nix, flake.nix: wrap LD_LIBRARY_PATH with libopenmpt's store path, the same way ffmpeg/yt-dlp are already put on PATH — dlopen has no rpath to fall back on since nothing links this library. - .github/workflows/aur.yml: add libopenmpt to the generated PKGBUILD's depends, alongside ffmpeg/yt-dlp (also dlopen/exec-based, also listed as hard dependencies there rather than left "optional" as they are for the curl-installer/manual-build path). - CI/release workflows and the Homebrew tap (a separate repo) need no changes: nothing here is linked at build time.
- audio-quality.md: the bit_depth row only mentioned two decoder categories (FFmpeg-decoded vs. native); tracker modules are a third, always decoding at full precision via libopenmpt like the native formats do. - site/index.html: add a features-grid card alongside the other playback-format features (Audio Quality, HTTP Streaming, ...).
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Included review availability: Your plan provides up to 8 included reviews per hour; 7 remain after this review. 📝 WalkthroughWalkthroughThis PR adds runtime-loaded ChangesTracker module playback
Estimated code review effort: 4 (Complex) | ~50 minutes Merge Risk: ⚪ Minimal · up to Tracker playback integration, runtime dependency guidance, and packaging updates have no confirmed merge-blocking defect. Sequence Diagram(s)sequenceDiagram
participant Input as Input file
participant Decoder as decodeWithExt
participant OpenMPTDecoder as decodeOpenmpt
participant Binding as player/openmpt
participant Library as libopenmpt
Input->>Decoder: Tracker module path and reader
Decoder->>OpenMPTDecoder: decodeOpenmpt(rc, path, sr)
OpenMPTDecoder->>Binding: Open(module bytes)
Binding->>Library: Create module
OpenMPTDecoder->>Binding: ReadInterleavedFloatStereo(...)
Binding->>Library: Render stereo float frames
Binding-->>OpenMPTDecoder: Rendered frames
OpenMPTDecoder-->>Decoder: openmptStreamer and format
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✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 41.18% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 34 functions across 13 files. (4 skipped: 4 unsupported.)
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Inline comments:
In `@docs/audio-quality.md`:
- Line 32: Update the tracker modules description in the bit_depth documentation
to state that they use the decoder’s native precision, rather than claiming they
always decode at full precision; retain that bit_depth does not affect them.
In `@flake.nix`:
- Line 69: Update the Darwin environment setup near the libopenmpt library-path
export to include the Nix store’s libopenmpt directory in DYLD_LIBRARY_PATH,
while preserving the existing LD_LIBRARY_PATH export for non-Darwin loading.
In `@player/decode_openmpt_test.go`:
- Around line 105-113: Update the error handling in the decodeWithExt test so
every routed extension, including .mod, .s3m, .xm, and .it, fails the test when
decoding returns an error. Remove the conditional acceptance and continue path,
ensuring the test verifies successful OpenMPT decoding for each extension.
In `@player/decode_openmpt.go`:
- Line 45: Update decodeOpenmpt to return the typed openmpt.ErrUnavailable error
without embedding the installation hint or user-facing message, and move
construction of the libopenmpt installation instruction to the main.go/run
output boundary while preserving the existing context and guidance.
- Line 48: Update the reading flow around io.ReadAll in the HTTP tracker URL
path to wrap rc with io.LimitReader using the configured maximum module size,
then detect and reject inputs that exceed that limit instead of accepting
truncated data. Preserve normal decoding for inputs within the limit.
Apply the same fix in `@player/decode.go` around lines 339 - 340: This route sends
tracker sources to the unbounded decoder read.
In `@player/openmpt/lib_unix.go`:
- Line 20: Update the dynamic-library loading error return around purego.Dlopen
to add loader context while preserving the original error chain, using the
established fmt.Errorf wrapping pattern with %w instead of returning lastErr
directly.
In `@player/openmpt/lib_windows.go`:
- Line 16: Update the library-loading flow around windows.LoadLibrary and the
handle-loading function to resolve libopenmpt.dll from a trusted absolute
executable or configured directory, then load it with LoadLibraryEx using
restricted dependency-search flags instead of the bare name. Preserve the
existing error and handle behavior after loading.
In `@player/openmpt/openmpt_test.go`:
- Line 126: Update the test around Open(nil) to check Available() first and skip
when libopenmpt is unavailable, ensuring the empty-input assertion exercises the
intended branch while preserving the existing error expectation when the library
is present.
In `@player/openmpt/openmpt.go`:
- Line 85: The openmpt error paths currently discard lower-layer errors from the
unwrap chain. In player/openmpt/openmpt.go:85, update the initErr construction
to wrap both ErrUnavailable and err; in player/decode_openmpt.go:53-55, wrap
openmpt.Open(data) failures with the “open module” context while preserving err
for unwrapping.
In `@README.md`:
- Line 88: Update the README installation guidance to document libopenmpt as an
optional runtime dependency for tracker playback: add it to the macOS and
Windows installation commands and identify the appropriate Linux package, while
making clear it is not required to build the project.
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📒 Files selected for processing (18)
.github/workflows/aur.ymlREADME.mddocs/audio-quality.mdflake.nixgo.modnix/package.nixplayer/decode.goplayer/decode_openmpt.goplayer/decode_openmpt_test.goplayer/openmpt/lib_darwin.goplayer/openmpt/lib_linux.goplayer/openmpt/lib_stub.goplayer/openmpt/lib_unix.goplayer/openmpt/lib_windows.goplayer/openmpt/openmpt.goplayer/openmpt/openmpt_test.goplayer/pipeline.gosite/index.html
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- bound module buffering (64 MiB cap) before io.ReadAll - LoadLibraryEx with restricted search flags on Windows (CWE-426) - preserve error chains in openmpt loader and decoder - require successful decode for every routed extension in tests - skip empty-input test when libopenmpt unavailable - docs: libopenmpt in README platform install lines; native precision wording
decodeOpenmpt now returns a typed openmpt.ErrUnavailable (wrapped with path context) instead of embedding the install instructions; ui/model's transient ERR line appends player.OpenmptInstallHint() via errors.Is — the same boundary pattern playback.go already uses for playlist.ErrNeedsAuth. yt-dlp/ffmpeg hint relocation postponed.
# Conflicts: # flake.nix # nix/package.nix
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Summary
Add support for tracker module files (.mod / .s3m / .xm / .it etc)
Screenshots / video
It's just adding formats, no UI change.
How to test
There are lots of examples on https://modarchive.org/ for example
(and enjoy, although it takes a few minutes to ramp up)
Checklist
make checkpassesdocs/andsite/index.htmlupdated for user-facing changesSummary by CodeRabbit
New Features
.mod,.s3m,.xm,.it, and approximately 60 additional formats.Documentation
Bug Fixes