RUNE-2002: Media Clip Audio Export Source Proposed

Updated2026-08-23

Summary

MediaClipAudioExportSource no longer exists. Clip scheduling and preparation now build one IAudioBuffer graph, wrap it as IAudioTrack, and let IMediaEncoder pull timestamped AudioSample chunks.

Design

For each export, orchestration:

1. Clones each source clip into a standalone IAudioBuffer.
2. Resamples it with ResampledAudioBuffer when the clip format does not match the export graph.
3. Applies per-source shaping such as gain with EffectAudioBuffer.
4. Uses SlicedAudioBuffer to trim clip duration and align each clip on the export timeline.
5. Returns either a single prepared buffer or a MixedAudioBuffer that sums and clamps float32 PCM sources.
6. Wraps the final graph in AudioBufferTrack, where chunk size is derived from ceil(sampleRate / fps) and each emitted AudioSample duration is based on the actual frames read.

Boundary

There is no clip-specific provider/source contract in Rune.Media. The media layer stays focused on buffer/effect processing, sample mixing, track transport, encode, and decode; clip scheduling happens before the sink sees any IAudioTrack.

Document provenance

Author

@devkanro

Created

2026-05-10

Audited at

2026-08-24 @ ce1dbcb4b5e0161eab69faeb97507a50808b69eb

Source

knowledge/media/audio-buffer-graph.md

Dependencies

RUNE-2001