docs: scope audio-io's planar claim; name the interleaved neighbours - #114
docs: scope audio-io's planar claim; name the interleaved neighbours#114erichchampion wants to merge 2 commits into
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"All functions use planar stereo" is about this header's own returns, but read alone it invites exactly the planar/interleaved mixup that destroys stereo -- an embedder feeding audio_read_48k's planar output straight into ace_synth_job_run_dit's src/ref (which takes time-major interleaved) gets channels smeared into each other, with plausible-looking wrong audio. Say explicitly that the planar claim is about this header's returns, that wav.h's raw reader is interleaved, and that the pipeline input is interleaved while its AceAudio output is planar. No code change.
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Included review availability: Your plan provides up to 2 included reviews per hour; 1 remains after this review. 📝 WalkthroughWalkthroughThe header comment now states that ChangesAudio layout documentation
Estimated code review effort: 1 (Trivial) | ~2 minutes Merge Risk: ⚪ Minimal · up to The update clarifies audio buffer layout contracts without changing application behavior. No current merge-blocking risk is identified. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Inline comments:
In `@src/audio-io.h`:
- Around line 7-8: Update the comment in audio-io.h to remove the contradictory
“deinterleaved on read” wording, clearly describing wav.h’s returned samples as
time-major interleaved stereo.
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src/audio-io.h
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Coderabbit correctly noted the parenthetical '(it is deinterleaved on read)' contradicted 'returns interleaved' -- wav.h does return time-major interleaved [t*2+0], [t*2+1]; it is the helpers in this header (audio_io_read_wav_buf, etc.) that deinterleave to planar [L:T][R:T] on read. Make that explicit so callers do not pass WAV output as planar.
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A documentation-only patch, found while wiring an embedder's audio path through
ace_synth_job_run_dit.audio-io.h's header line says "All functions use planar stereo float". That is accurate about this header's own returns, but read alone it invites exactly the planar/interleaved mixup that destroys stereo:wav.h's raw reader returns interleaved (deinterleaved on read by this header);src_audio/ref_audioinput takes time-major interleaved (vae_enc_computeindexesaudio[t * 2 + c]);AceAudiooutput is planar, like this header's returns.An embedder that takes the blanket claim as "everything here is planar" feeds
audio_read_48k's planar output straight intosrc_audioand gets the two channels smeared into each other — plausible-looking wrong audio, no error, no crash. (We measured it: a correct-layout round trip correlates each output channel with its own input at ~0.997 and cross-channel at ~0.01; a smeared layout collapses that separation.)This patch scopes the planar claim to this header and names the two interleaved neighbours. No code change; comments only.
Also filed on our side: a round-trip test pinning the layout contract (
test-audio-layouton ourcadenzabranch) — happy to offer it here too if wanted.Summary by CodeRabbit