audio_flutter

Add SystemAudioProcessSelector, a pure expansion of a target app set over a FlutterSystemAudio.listProcesses() snapshot. Tapping Teams, Chrome, or Safari by their main process ID captured nothing, because those apps render audio in helper processes or in shared browser-engine processes under another bundle namespace. The prefix tables (browsers' external media processes, Electron helper suffixes, the Teams family) are public const and replaceable through the constructor.

Add FlutterMicrophonePermission (status()/request()) and AudioMicrophonePermissionStatus. FlutterAudioCaptureSource.prepare() now fails a microphone capture with the typed microphone_permission_denied failure when access is denied or restricted, instead of starting an engine that delivers only zeroes. An undetermined status still reaches the system prompt, and a platform without a permission gate is never blocked.

Add FlutterSystemAudio.cleanupOrphanedCaptureDevices(), which reclaims private capture devices leaked by a process that died mid-capture. Documented as an app-start call.

Report AudioDiscontinuityReason.sourceRestart on frames whose native capture chain was rebuilt (an output-device switch, a helper process appearing). Every native gap used to arrive as droppedFrames; a restart that lost no frames now breaks continuity too, because the audio after it is not a continuation of the audio before it.

Widen FlutterAudioCaptureHealth with peakAmplitude, rms, nonZeroFramePercent, renderCycles, and firstAudioAtMillis. A single receivingAudio bool could not tell a quiet room from a dead tap.

Document the mic-delay recipe in the README: how to derive the start skew between two captures from their first AudioFrame timestamps and clockIds, for consumers such as mic-bleed dedup.

Endorse audio_flutter_linux for linux and audio_flutter_windows for windows. Both are declared under flutter.plugin.platforms as default_package, so a host app that depends only on audio_flutter gets the platform implementation registered without naming it. The federated facade in lib/ is unchanged: the new platforms arrive entirely through endorsement, not through new Dart API.

Add linux and windows to the declared platforms. The package now advertises ios/linux/macos/windows. Capability is still per platform — system/process capture remains macOS-only.

Add dependencies on audio_flutter_linux: ^0.1.0 and audio_flutter_windows: ^0.1.0. Both packages are new because neither implementation has been published yet; this package cannot be re-released until they are live on pub.dev at a stable version and these constraints are widened to ^0.1.0.

Add example/, a minimal capture and device-listing app for windows/linux/macos. It is the only place the native halves of the federated plugin are compiled at all — the desktop CI jobs build it, and the Windows C++ plugin's first-ever compile happens there. Its macOS deployment target is 14.0.

Document in the README that Apple platforms still require the host app's Info.plist microphone usage description; the permission API added in this release governs the grant, not the declaration.

Add FlutterCaptureBackend, the federated implementation of audio_core's new CaptureBackend contract. Probes are single-use grants: a start must present the exact request/source pair that was probed, and the source is revalidated immediately before native allocation.

Expose monotonic timing on prepared capture sessions: timingQuality and the timing mapping established by the first delivered frame, plus optional logicalSourceId and timingQuality overrides on the session config, so a host can carry a normalized source identity and timing provenance through to durable track manifests.