feat(player): add optional MPV backend - #360
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No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info⚙️ Run configurationConfiguration used: Repository UI Review profile: ASSERTIVE Plan: Pro Plus Run ID: 📒 Files selected for processing (11)
Included review availability: Your plan provides up to 8 included reviews per hour; 7 remain after this review. 📝 WalkthroughWalkthroughThe change adds an optional MPV playback backend with direct ALSA and bit-perfect modes. It adds backend configuration, CLI flags, capability checks, runtime diagnostics, engine-scoped device control, Linux audio reservation, tests, and documentation. ChangesMPV audio backend
Estimated code review effort: 5 (Critical) | ~120 minutes Merge Risk: 🔵 Low · up to The optional MPV backend is mergeable with owner awareness: device discovery may display an incorrect active device, and some backend diagnostic updates may not refresh subscribers promptly. These bounded correctness and observability issues should be followed up after merge. Sequence Diagram(s)sequenceDiagram
participant User
participant CLI
participant Main
participant MPVBackend
participant MPV
participant TUI
User->>CLI: Select MPV backend and audio options
CLI->>Main: Load and validate configuration
Main->>MPVBackend: Create configured engine
MPVBackend->>MPV: Start process and connect JSON IPC
TUI->>MPVBackend: Send playback and control operations
MPVBackend->>MPV: Issue playback or property commands
MPV-->>MPVBackend: Return state and audio properties
MPVBackend-->>TUI: Update runtime snapshot and diagnostics
Suggested reviewers: 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 17.86% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 56 functions across 26 files. (2 skipped: 2 unsupported.) Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out. Comment |
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Actionable comments posted: 11
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Inline comments:
In `@commands.go`:
- Around line 109-127: Update listAudioDevices to wrap errors from config.Load,
player.NewMPVBackend, and the native/MPV ListAudioDevices calls with
operation-specific fmt.Errorf context while preserving causes via %w; keep the
existing control flow and backend selection unchanged.
- Around line 109-125: Update listAudioDevices to construct player.MPVOptions
from the effective cfg values, including AudioDevice, reservation, and
bit-perfect settings, before calling player.NewMPVBackend. Preserve the existing
backend error handling and cleanup while ensuring MPV receives all configured
audio options.
In `@config.toml.example`:
- Around line 8-9: Update the audio_reservation example comment to state that it
requires audio_backend = "mpv" in addition to the existing Linux and pw-reserve
prerequisites, so users do not enable it with the native backend default.
In `@daemon_v2.go`:
- Around line 574-587: Update daemon_v2.go lines 574-587 so
daemonRuntimeFingerprint and runtimeFingerprintLocked include backend status
plus source and output audio parameters. Update ui/model/ipc_runtime.go lines
613-626 so ipcRuntimeFingerprint and runtimeFingerprint include backend status,
device, and source/output audio parameters, ensuring changes in these
diagnostics produce new runtime events.
In `@docs/cli.md`:
- Around line 26-27: Update the CLI example using --audio-reservation Audio2 to
also specify the matching --audio-device explicitly, ensuring MPV opens the
intended output device.
In `@main.go`:
- Around line 293-300: Guard the cfg.Visualizer mutation and applog.UserWarn
call in the “mpv” backend setup so they execute only when player.NewMPVBackend
succeeds; preserve the existing startup error path when backend creation fails.
- Around line 482-493: Update the progOpts passed to tea.NewProgram to include
tea.WithoutSignalHandler(), disabling Bubble Tea’s built-in SIGINT/SIGTERM
handling while preserving the existing playback signal handler and cleanup flow.
In `@player/mpv.go`:
- Around line 406-430: Update MPVBackend.resolvePath to deterministically select
the resolver with the longest matching prefix instead of stopping at the first
map entry; track the best prefix and corresponding resolver while iterating,
then preserve the existing resolution and error handling for the selected
resolver.
- Around line 170-185: Remove the duplicate --volume-max=100 argument from the
options.BitPerfect argument list, leaving the existing --volume-max=200 setting
as the sole volume limit while preserving the other bit-perfect arguments.
In `@player/reservation_linux.go`:
- Around line 45-53: Update the r.done handling in the reservation flow to
account for a nil wait error when pw-reserve exits successfully. Build a normal
exit-condition error or message before formatting, so both the stderr and
no-stderr branches avoid wrapping or rendering a nil error while preserving the
existing device name and stderr detail.
In `@player/reservation_other.go`:
- Around line 1-3: Rename reservation_other.go to reservation_stub.go to follow
the repository’s platform-file suffix convention, and preserve the existing
!linux build constraint and package declaration unchanged.
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📒 Files selected for processing (32)
README.mdcommands.goconfig.toml.exampleconfig/audio_backend_test.goconfig/config.goconfig/flags.godaemon.godaemon_v2.godocs/audio-quality.mddocs/cli.mddocs/configuration.mddocs/mpv.mddocs/remote-control.mdipc/protocol.goipc/v2.gomain.goplayer/engine.goplayer/mpv.goplayer/mpv_test.goplayer/reservation_linux.goplayer/reservation_linux_test.goplayer/reservation_other.gosite/index.htmlui/model/audio.goui/model/backend.goui/model/commands.goui/model/inline_overlays.goui/model/ipc_runtime.goui/model/keys.goui/model/model.goui/model/update.goui/model/view.go
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Owner
|
I'll think about it. cliamp is supposed to be the backend. |
Author
Actually, mpv backend will provide bit perfect audio. That's the update I've brought. |
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Architecture summary
player.Engineas the application playback boundary; the existing native*player.Playerremains the default.MPVBackendbehind the same engine contract and optional capability/status interfaces.Persistent MPV JSON IPC design
mpv --idle=yes --no-video --no-terminalprocess.$XDG_RUNTIME_DIR/cliampwhen available, with a private temporary-directory fallback.request_idvalues while dispatching asynchronous events independently.New CLI and configuration options
--audio-backend native|mpv/audio_backend(default:native)--audio-device/audio_device; MPV receives the exact configured value--bit-perfect,--no-bit-perfect/bit_perfect--audio-reservation/audio_reservationfor an explicit Linux ReserveDevice1 name--audio-device listuses backend-specific device discoveryBit-perfect safeguards
Bit-perfect mode requires an explicit
alsa/hw:MPV device, locks MPV volume to 100 and speed to 1.0, disables MPV config files, audio filters, ReplayGain, normalization, pitch correction, cliamp EQ, and mono, and rejects conflicting startup/runtime controls. It does not force sample rate or PCM format, so ALSA may negotiate native rates and carry 24-bit samples asS32_LE.The UI and status describe this as a bit-perfect-capable configuration, not proof of the complete hardware path.
PipeWire reservation behavior
Linux users may set an explicit reservation such as
Audio2. cliamp then ownspw-reserve -n Audio2 -a cliamp -rfor its lifetime and releases it during shutdown. The feature is optional, requirespw-reserve, never kills PipeWire, and never guesses ALSA-card-to-reservation mapping.Unsupported MPV-mode features
These capabilities report unavailable instead of being faked. Normal MPV mode still supports software volume and speed; bit-perfect mode locks them.
Tests and exact results
Executed with Go 1.26.6:
make check— PASS (gofmt -l -w .,go vet ./...,go test ./...)go test -race ./...— PASSgo build ./...— PASSgit diff --check— PASSUnit coverage includes backend/config selection, bit-perfect validation, MPV arguments, JSON request-ID response routing, asynchronous events and state transitions, end-file behavior, socket cleanup, process termination, reservation handling, and a separately gated fake/real MPV integration path. The default suite needs no MPV, ALSA, PipeWire, or audio hardware.
Manual direct-ALSA test plan
Verify TUI play/pause, seek, next/previous, queue, repeat, shuffle, duration/position, end-of-track advancement, direct ALSA ownership, source-rate switching, and cleanup/reclaim after exit. Exercise 16/44.1, 16/48, 24/44.1, 24/48, 24/96, and 24/192 files; do not force all tracks to one sample rate.
Known limitations
pw-reserve, and requires an explicit reservation name.Summary by CodeRabbit
New Features
Documentation