APIでオーディオをマスタリングする：curl、Python、Node、バッチ、MCP

仕様を読む（キー不要）

curl https://jam-jam.org/api/v1/mastering/capabilities

内蔵プリセットでレンダリングし、ジョブを追跡してWAVをダウンロード

# 1. Upload the file with a built-in preset (Idempotency-Key is required)
curl -X POST https://jam-jam.org/api/v1/mastering/jobs \
  -H "Authorization: Bearer $JAM_JAM_API_KEY" \
  -H "Idempotency-Key: $(uuidgen)" \
  -F [email protected] -F preset=builtin:warm -F format=wav-pcm16
# The 202 answer carries the job "id": JOB_ID=<that id>

# 2. Follow the job, honouring Retry-After, until "status" is "done"
curl https://jam-jam.org/api/v1/mastering/jobs/$JOB_ID \
  -H "Authorization: Bearer $JAM_JAM_API_KEY"

# 3. Download the mastered WAV
curl -o mix-master.wav https://jam-jam.org/api/v1/mastering/jobs/$JOB_ID/result \
  -H "Authorization: Bearer $JAM_JAM_API_KEY"

Python（3.10以降、requests）

import os, time, uuid, requests

API = "https://jam-jam.org/api/v1"
HEADERS = {"Authorization": f"Bearer {os.environ['JAM_JAM_API_KEY']}"}
FINAL = ("done", "failed", "cancelled", "expired")

# 1. Upload the file with a built-in preset. Idempotency-Key is required.
with open("mix.wav", "rb") as audio:
    res = requests.post(
        f"{API}/mastering/jobs",
        headers={**HEADERS, "Idempotency-Key": str(uuid.uuid4())},
        data={"preset": "builtin:warm", "format": "wav-pcm16"},
        files={"file": ("mix.wav", audio)},
    )
res.raise_for_status()
job = res.json()

# 2. Poll, waiting as long as the server asks.
while job["status"] not in FINAL:
    time.sleep(int(res.headers.get("Retry-After") or 2))
    res = requests.get(f"{API}/mastering/jobs/{job['id']}", headers=HEADERS)
    res.raise_for_status()
    job = res.json()
if job["status"] != "done":
    raise SystemExit(f"mastering {job['status']}: {job.get('error')}")

before, after = job["report"]["before"], job["report"]["after"]
print(f"LUFS {before['integratedLufs']} -> {after['integratedLufs']}")

# 3. Download the mastered WAV.
audio = requests.get(f"{API}/mastering/jobs/{job['id']}/result", headers=HEADERS)
audio.raise_for_status()
with open("mix-master.wav", "wb") as out:
    out.write(audio.content)

Node（20以降、依存なし）

import { openAsBlob } from 'node:fs';
import { writeFile } from 'node:fs/promises';

const API = 'https://jam-jam.org/api/v1';
const headers = { Authorization: `Bearer ${process.env.JAM_JAM_API_KEY}` };
const FINAL = ['done', 'failed', 'cancelled', 'expired'];

// 1. Upload the file with a built-in preset. Idempotency-Key is required.
const body = new FormData();
body.append('file', await openAsBlob('mix.wav'), 'mix.wav');
body.append('preset', 'builtin:warm');
body.append('format', 'wav-pcm16');
let res = await fetch(`${API}/mastering/jobs`, {
  method: 'POST',
  headers: { ...headers, 'Idempotency-Key': crypto.randomUUID() },
  body,
});
if (!res.ok) throw new Error(`${res.status} ${await res.text()}`);
let job = await res.json();

// 2. Poll, waiting as long as the server asks.
while (!FINAL.includes(job.status)) {
  await new Promise((r) => setTimeout(r, (Number(res.headers.get('retry-after')) || 2) * 1000));
  res = await fetch(`${API}/mastering/jobs/${job.id}`, { headers });
  if (!res.ok) throw new Error(`${res.status} ${await res.text()}`);
  job = await res.json();
}
if (job.status !== 'done') throw new Error(`mastering ${job.status}: ${JSON.stringify(job.error)}`);

const { before, after } = job.report;
console.log(`LUFS ${before.integratedLufs} -> ${after.integratedLufs}`);

// 3. Download the mastered WAV.
res = await fetch(`${API}/mastering/jobs/${job.id}/result`, { headers });
if (!res.ok) throw new Error(`${res.status} ${await res.text()}`);
await writeFile('mix-master.wav', Buffer.from(await res.arrayBuffer()));

自分の設定を送る

{
  "modules": {
    "autoEq":   { "value": 50, "enabled": true },
    "lows":     { "value": 2, "enabled": true },
    "mids":     { "value": -0.5, "enabled": true },
    "highs":    { "value": -1.5, "enabled": true },
    "deEss":    { "value": 40, "enabled": true },
    "width":    { "value": 10, "enabled": true },
    "loudness": { "value": 45, "enabled": true },
    "destruct": { "value": 0, "enabled": false }
  },
  "target": "streaming",
  "normalize": false
}

自分の設定を送る

curl -X POST https://jam-jam.org/api/v1/mastering/jobs \
  -H "Authorization: Bearer $JAM_JAM_API_KEY" -H "Idempotency-Key: $(uuidgen)" \
  -F [email protected] -F "settings=<samples/mastering-settings.json" -F format=wav-pcm16

フォルダを1ファイルずつマスタリング

python mastering_batch.py ~/Music/mixes --preset builtin:balanced --out masters
node mastering-batch.mjs ~/Music/mixes --preset builtin:balanced --out masters

MCPクライアントの設定

{
  "mcpServers": {
    "jam-jam": {
      "command": "npx",
      "args": ["-y", "@jam-jam/convert-mcp"],
      "env": { "JAM_JAM_API_KEY": "jj_live_..." }
    }
  }
}