Make the global audio context explicit - #89
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…tions setAudioOutputDevice and getCurrentOutputDeviceId always targeted the global context, so apps passing their own context to createSamplePlayer could not route its output. configureAudioContext lets apps set the global context's sample rate instead of creating their own.
environment.ts constructed an AudioContext at import time just to read audioWorklet, costing every consumer an audio thread and an autoplay warning on load. Check BaseAudioContext.prototype instead.
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WalkthroughThe audio-context API adds global context creation and access, persistent options, and context-specific output-device operations. It recreates closed contexts and resumes suspended contexts after a user gesture. Selected callers now require an explicit context. Player and recorder factories use the global context when none is supplied. ChangesGlobal audio-context API and callers
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Feature Merge Risk: 🔵 Low · up to Replacing the global audio context can unexpectedly reset playback to the system default device. Preserve the selected device before merging, or explicitly accept this bounded routing behavior. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Nothing imported it and no package entry point exported it. Worklet support is already checked by initProcessors on the real context.
KristinnRoach
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KristinnRoach
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Review comments at @src/nodes/instruments/Sample/createSamplePlayer.ts:
- Line 22: Update getOrCreateGlobalAudioContext so it replaces the singleton
when its state is closed and resets the associated resume state; keep
suspended-context creation nonblocking and preserve the synchronous getter
behavior used by createSamplePlayer.
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📒 Files selected for processing (14)
.changeset/no-import-time-audio-context.mdREADME.mdsrc/context/globalAudioContext.test.tssrc/context/globalAudioContext.tssrc/index.tssrc/nodes/effects/DattorroReverb.tssrc/nodes/effects/HarmonicFeedback.tssrc/nodes/instruments/Sample/SampleVoice.tssrc/nodes/instruments/Sample/createSamplePlayer.tssrc/nodes/master/InstrumentBus.tssrc/nodes/recorder/factory.tssrc/utils/audiodata/process/createPitchDivideEffect.tssrc/utils/index.tssrc/utils/validate/environment.ts
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- src/utils/validate/environment.ts
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…Context configureGlobalAudioContext takes AudioContextOptions, merges them, and replaces a live context when an option changes, keeping its output device. ensureGlobalAudioContext could hang waiting for a gesture and missed re-suspends; getOrCreate now replaces closed contexts and re-arms auto-resume. releaseGlobalAudioContext clears the singleton before close() so it can't wipe a replacement.
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Inline comments:
Review comments at @.changeset/configure-audio-context.md:
- Around line 5-9: Update the changeset release level for the public API changes
documented in the changeset: use a major bump for a stable package, or a minor
bump if the package is pre-1.0, instead of patch.
Review comments at @README.md:
- Line 57: Update the README example’s createSamplePlayer call to pass the
sample AudioBuffer or ArrayBuffer as its first argument and the context options
as its second; declare player before assigning to it if it is not already
declared in the snippet.
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decodeAudioData detaches its input, so passing the same buffer twice failed. SamplePlayer already copies.
…lobalAudioContext
configureGlobalAudioContext could silently close the live context and had a
three-way return. The library now owns the global context: create replaces and
closes it explicitly, and apps that need their own context pass it via { context }.
Bump to minor since the public API changes.
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Inline comments:
Review comments at @src/context/globalAudioContext.ts:
- Around line 30-35: Update createGlobalAudioContext to preserve the previous
context’s non-empty sink ID when building globalOptions, but only when
canSetOutputDevice() is true and the caller did not provide sinkId; keep
caller-supplied options as the override.
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.changeset/configure-audio-context.mdREADME.mdsrc/context/globalAudioContext.test.tssrc/context/globalAudioContext.tssrc/index.tssrc/nodes/instruments/Sample/createSamplePlayer.tssrc/nodes/recorder/factory.ts
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Changing the sample rate went through a function named "create", which is confusing for users who never manage contexts. configureAudio stores options lazily before first use and is a no-op when options are unchanged.
Pairs with getGlobalAudioContext and makes clear it doesn't affect contexts passed in by the app.
Changing options on a live context silently stopped every node built on it. Creating is now explicit and throws while a context is open. SamplePlayer warns and emits context:closed when its context closes.
KristinnRoach
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getGlobalAudioContext reuses createGlobalAudioContext so a replaced context also arms auto-resume. createPitchDivideEffect builds its AudioBuffer without a context. Changeset lists only public API changes.
Forcing a sampleRate makes the browser resample all output when the hardware runs at a different rate.
DEFAULT keeps only the filter constants, moved to BiquadFilter.ts. Offline contexts keep their own local defaults.
Nothing used it, and caching OfflineAudioContext instances is wrong since each one can only render once.
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Breaking, released as 0.6.0. See the changeset for the API list.
Not obvious from the code
createGlobalAudioContextthrows while a global context is open. Nodes can't move between contexts, so changingsampleRatemeans disposing them and creating again.close()only setsstateto'closed'once its promise resolves, soawaitit first.SamplePlayernow warns and emitscontext:closed.setAudioOutputDeviceagain.ensureAudioCtxwas removed because it could wait forever for a gesture (this blockedsetAudioOutputDevice), and it missed a context that was suspended again later. Auto-resume now re-arms whenevergetGlobalAudioContextfinds the context suspended.decodeAudioDatadetaches its input, socreateSamplePlayerdecodes a copy.AudioContextat import time.sampleRateby default, so it runs at the device's native rate instead of resampling.DEFAULT.audioConfig,DEFAULT_SAMPLE_RATEandDEFAULT_NUMBER_OF_CHANNELSare removed fromDEFAULT.getOfflineAudioContextand friends). They cachedOfflineAudioContextinstances, which can only render once.Validation
vp checkandvp testpass (293 passed, 1 skipped). Not tested in a browser: output-device switching, rebuilding after a sample-rate change, auto-resume on iOS Safari, andcreatePitchDivideEffectnow usingnew AudioBuffer().