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The trickiest reading on the disc lived in the Bevy viewer: resolving a cutscene's voice to a continuous byte REGION of the sound stream, because the movie voices are one XMA stream chunked into VOICE_*.slb entries whose boundaries do not match the cues -- a cue routinely spans two chunks, so a .slb need not hold the track its name claims. That put the logic most likely to be re-derived incorrectly in the crate least likely to be reused. The Godot port's exporter needs the same answers, and there must be one implementation of them. New `sylpheed_formats::media` owns every case where the bytes of one playable thing are not one archive entry: segment-spanning reads, multi-sub-wave banks, and the voice-region resolution. Callers supply bytes through a `DiscSource` trait, so the viewer keeps its ISO/directory abstraction and a headless consumer gets `DirectorySource` for free. The seam is deliberate: this module returns XMA RIFFs, not PCM. Decoding means shelling out to FFmpeg, which is native-only and a policy decision for the consumer -- everything up to "here are the bytes that belong together" is disc knowledge, everything after it is a codec choice. The four moved functions were previously untested; `tests/media_disc.rs` now pins them, including the negative the corpus paid for -- an unbound movie must stay unvoiced rather than borrow a neighbour's clip, which was tried and played the WRONG recording. The algorithm is unchanged, moved verbatim (same window sizes, same fallbacks). The new disc tests pass; the broader audio suite was not re-run in this pass. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>