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feat: MusicBrainz BPM enrichment + improved AI prompts

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- lookupRecordingWithTags, extractBpmFromTags, extractTimeSigFromTags, getMusicBrainzRecording added to MB client
- upsertSong preserves existing BPM via COALESCE on conflict
- updateSongBpm helper for async enrichment writes
- AnalysisInput gains confirmedBpm / confirmedTimeSigNum fields
- POST /api/analyze fetches confirmed BPM from DB then MB tags before generation
- All three AI providers use confirmedBpm as authoritative and build enriched userMessage
- POST /api/tracks auto-registration now fetches tags via getMusicBrainzRecording
- Updated User-Agent and MB client fallback URL to Gitea

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
AJ Avezzano
2026-04-03 19:25:04 -04:00
parent 7ba4381bff
commit 5e686fc9c4
8 changed files with 223 additions and 26 deletions
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17
lib/analysis/providers/openai.ts
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@@ -38,8 +38,17 @@ export const openaiProvider: AnalysisProvider = {
const baseUrl = process.env.OPENAI_BASE_URL ?? "https://api.openai.com/v1";
const model = process.env.OPENAI_MODEL ?? "gpt-4o";
const { bpm, duration, title, artist, mbid, contributed_by } = input;
const approxBars = Math.round((duration * bpm) / 60 / 4);
const { bpm, duration, title, artist, mbid, contributed_by, confirmedBpm, confirmedTimeSigNum } = input;
const effectiveBpm = confirmedBpm ?? bpm;
const approxBars = Math.round((duration * effectiveBpm) / 60 / 4);
const bpmLine = confirmedBpm
? `Confirmed BPM (from MusicBrainz community tags — treat as authoritative): ${confirmedBpm}\nDetected BPM (audio analysis): ${bpm}`
: `Detected BPM (audio analysis): ${bpm}`;
const timeSigHint = confirmedTimeSigNum
? `\nConfirmed time signature numerator: ${confirmedTimeSigNum}`
: "";
const userMessage = `\
Generate a CTP document for the following song:
@@ -47,11 +56,11 @@ Generate a CTP document for the following song:
Title: ${title ?? "Unknown Title"}
Artist: ${artist ?? "Unknown Artist"}
MusicBrainz ID: ${mbid ?? "unknown"}
Detected BPM: ${bpm}
${bpmLine}${timeSigHint}
Duration: ${duration.toFixed(1)} seconds (~${approxBars} bars at 4/4)
Contributed by: ${contributed_by}
Create a plausible section layout for this song. If this is a well-known song, use your knowledge of its actual arrangement. If not, use a sensible generic structure.`;
If you recognise this song, use your training knowledge of its actual arrangement — section names, bar counts, time signature, and any tempo changes. If you do not recognise it, use a sensible generic structure based on the BPM and duration above.`;
const response = await fetch(`${baseUrl}/chat/completions`, {
method: "POST",