Implement AcoustID, GetSongBPM, and frontend MediaRecorder

2026-08-26 01:35:53 +02:00
1 parent ad677e8aad
commit cba518e52a
@@ -8,9 +8,11 @@
      "name": "keyselector",
      "version": "1.0.0",
      "dependencies": {
+        "axios": "^1.19.0",
        "cors": "^2.8.5",
        "dotenv": "^16.3.1",
        "express": "^4.18.2",
+        "multer": "^2.2.0",
        "node-fetch": "^3.3.2"
      }
    },
@@ -27,12 +29,71 @@
        "node": ">= 0.6"
      }
    },
+    "node_modules/agent-base": {
+      "version": "6.0.2",
+      "resolved": "https://registry.npmjs.org/agent-base/-/agent-base-6.0.2.tgz",
+      "integrity": "sha512-RZNwNclF7+MS/8bDg70amg32dyeZGZxiDuQmZxKLAlQjr3jGyLx+4Kkk58UO7D2QdgFIQCovuSuZESne6RG6XQ==",
+      "license": "MIT",
+      "dependencies": {
+        "debug": "4"
+      },
+      "engines": {
+        "node": ">= 6.0.0"
+      }
+    },
+    "node_modules/agent-base/node_modules/debug": {
+      "version": "4.4.3",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-4.4.3.tgz",
+      "integrity": "sha512-RGwwWnwQvkVfavKVt22FGLw+xYSdzARwm0ru6DhTVA3umU5hZc28V3kO4stgYryrTlLpuvgI9GiijltAjNbcqA==",
+      "license": "MIT",
+      "dependencies": {
+        "ms": "^2.1.3"
+      },
+      "engines": {
+        "node": ">=6.0"
+      },
+      "peerDependenciesMeta": {
+        "supports-color": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/agent-base/node_modules/ms": {
+      "version": "2.1.3",
+      "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.3.tgz",
+      "integrity": "sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA==",
+      "license": "MIT"
+    },
+    "node_modules/append-field": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/append-field/-/append-field-1.0.0.tgz",
+      "integrity": "sha512-klpgFSWLW1ZEs8svjfb7g4qWY0YS5imI82dTg+QahUvJ8YqAY0P10Uk8tTyh9ZGuYEZEMaeJYCF5BFuX552hsw==",
+      "license": "MIT"
+    },
    "node_modules/array-flatten": {
      "version": "1.1.1",
      "resolved": "https://registry.npmjs.org/array-flatten/-/array-flatten-1.1.1.tgz",
      "integrity": "sha512-PCVAQswWemu6UdxsDFFX/+gVeYqKAod3D3UVm91jHwynguOwAvYPhx8nNlM++NqRcK6CxxpUafjmhIdKiHibqg==",
      "license": "MIT"
    },
+    "node_modules/asynckit": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
+      "integrity": "sha512-Oei9OH4tRh0YqU3GxhX79dM/mwVgvbZJaSNaRk+bshkj0S5cfHcgYakreBjrHwatXKbz+IoIdYLxrKim2MjW0Q==",
+      "license": "MIT"
+    },
+    "node_modules/axios": {
+      "version": "1.19.0",
+      "resolved": "https://registry.npmjs.org/axios/-/axios-1.19.0.tgz",
+      "integrity": "sha512-ht/iuYZXEjFxLH/Hkezgd7m6JKlHHXEUSneaDz8uZe1Gj5QZtCnpyDsckvAiEnT89OEbCLmnte4R4sn7P0EKFw==",
+      "license": "MIT",
+      "dependencies": {
+        "follow-redirects": "^1.16.0",
+        "form-data": "^4.0.6",
+        "https-proxy-agent": "^5.0.1",
+        "proxy-from-env": "^2.1.0"
+      }
+    },
    "node_modules/body-parser": {
      "version": "1.20.6",
      "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-1.20.6.tgz",
@@ -57,6 +118,23 @@
        "npm": "1.2.8000 || >= 1.4.16"
      }
    },
+    "node_modules/buffer-from": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/buffer-from/-/buffer-from-1.1.2.tgz",
+      "integrity": "sha512-E+XQCRwSbaaiChtv6k6Dwgc+bx+Bs6vuKJHHl5kox/BaKbhiXzqQOwK4cO22yElGp2OCmjwVhT3HmxgyPGnJfQ==",
+      "license": "MIT"
+    },
+    "node_modules/busboy": {
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/busboy/-/busboy-1.6.0.tgz",
+      "integrity": "sha512-8SFQbg/0hQ9xy3UNTB0YEnsNBbWfhf7RtnzpL7TkBiTBRfrQ9Fxcnz7VJsleJpyp6rVLvXiuORqjlHi5q+PYuA==",
+      "dependencies": {
+        "streamsearch": "^1.1.0"
+      },
+      "engines": {
+        "node": ">=10.16.0"
+      }
+    },
    "node_modules/bytes": {
      "version": "3.1.2",
      "resolved": "https://registry.npmjs.org/bytes/-/bytes-3.1.2.tgz",
@@ -95,6 +173,33 @@
        "url": "https://github.com/sponsors/ljharb"
      }
    },
+    "node_modules/combined-stream": {
+      "version": "1.0.8",
+      "resolved": "https://registry.npmjs.org/combined-stream/-/combined-stream-1.0.8.tgz",
+      "integrity": "sha512-FQN4MRfuJeHf7cBbBMJFXhKSDq+2kAArBlmRBvcvFE5BB1HZKXtSFASDhdlz9zOYwxh8lDdnvmMOe/+5cdoEdg==",
+      "license": "MIT",
+      "dependencies": {
+        "delayed-stream": "~1.0.0"
+      },
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/concat-stream": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/concat-stream/-/concat-stream-2.0.0.tgz",
+      "integrity": "sha512-MWufYdFw53ccGjCA+Ol7XJYpAlW6/prSMzuPOTRnJGcGzuhLn4Scrz7qf6o8bROZ514ltazcIFJZevcfbo0x7A==",
+      "engines": [
+        "node >= 6.0"
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "buffer-from": "^1.0.0",
+        "inherits": "^2.0.3",
+        "readable-stream": "^3.0.2",
+        "typedarray": "^0.0.6"
+      }
+    },
    "node_modules/content-disposition": {
      "version": "0.5.4",
      "resolved": "https://registry.npmjs.org/content-disposition/-/content-disposition-0.5.4.tgz",
@@ -166,6 +271,15 @@
        "ms": "2.0.0"
      }
    },
+    "node_modules/delayed-stream": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/delayed-stream/-/delayed-stream-1.0.0.tgz",
+      "integrity": "sha512-ZySD7Nf91aLB0RxL4KGrKHBXl7Eds1DAmEdcoVawXnLD7SDhpNgtuII2aAkg7a7QS41jxPSZ17p4VdGnMHk3MQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.4.0"
+      }
+    },
    "node_modules/depd": {
      "version": "2.0.0",
      "resolved": "https://registry.npmjs.org/depd/-/depd-2.0.0.tgz",
@@ -256,6 +370,21 @@
        "node": ">= 0.4"
      }
    },
+    "node_modules/es-set-tostringtag": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/es-set-tostringtag/-/es-set-tostringtag-2.1.0.tgz",
+      "integrity": "sha512-j6vWzfrGVfyXxge+O0x5sh6cvxAog0a/4Rdd2K36zCMV5eJ+/+tOAngRO8cODMNWbVRdVlmGZQL2YS3yR8bIUA==",
+      "license": "MIT",
+      "dependencies": {
+        "es-errors": "^1.3.0",
+        "get-intrinsic": "^1.2.6",
+        "has-tostringtag": "^1.0.2",
+        "hasown": "^2.0.2"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      }
+    },
    "node_modules/escape-html": {
      "version": "1.0.3",
      "resolved": "https://registry.npmjs.org/escape-html/-/escape-html-1.0.3.tgz",
@@ -358,6 +487,42 @@
        "node": ">= 0.8"
      }
    },
+    "node_modules/follow-redirects": {
+      "version": "1.16.0",
+      "resolved": "https://registry.npmjs.org/follow-redirects/-/follow-redirects-1.16.0.tgz",
+      "integrity": "sha512-y5rN/uOsadFT/JfYwhxRS5R7Qce+g3zG97+JrtFZlC9klX/W5hD7iiLzScI4nZqUS7DNUdhPgw4xI8W2LuXlUw==",
+      "funding": [
+        {
+          "type": "individual",
+          "url": "https://github.com/sponsors/RubenVerborgh"
+        }
+      ],
+      "license": "MIT",
+      "engines": {
+        "node": ">=4.0"
+      },
+      "peerDependenciesMeta": {
+        "debug": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/form-data": {
+      "version": "4.0.6",
+      "resolved": "https://registry.npmjs.org/form-data/-/form-data-4.0.6.tgz",
+      "integrity": "sha512-vKatAh4SlVfgbv+YtmhiRjhEMJsYpsG1Y2rMQtR+SVSbytsSD1YGzDIcrAJmdFec88u/+VoGmxnl+80gL1tRCQ==",
+      "license": "MIT",
+      "dependencies": {
+        "asynckit": "^0.4.0",
+        "combined-stream": "^1.0.8",
+        "es-set-tostringtag": "^2.1.0",
+        "hasown": "^2.0.4",
+        "mime-types": "^2.1.35"
+      },
+      "engines": {
+        "node": ">= 6"
+      }
+    },
    "node_modules/formdata-polyfill": {
      "version": "4.0.10",
      "resolved": "https://registry.npmjs.org/formdata-polyfill/-/formdata-polyfill-4.0.10.tgz",
@@ -458,6 +623,21 @@
        "url": "https://github.com/sponsors/ljharb"
      }
    },
+    "node_modules/has-tostringtag": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/has-tostringtag/-/has-tostringtag-1.0.2.tgz",
+      "integrity": "sha512-NqADB8VjPFLM2V0VvHUewwwsw0ZWBaIdgo+ieHtK3hasLz4qeCRjYcqfB6AQrBggRKppKF8L52/VqdVsO47Dlw==",
+      "license": "MIT",
+      "dependencies": {
+        "has-symbols": "^1.0.3"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
    "node_modules/hasown": {
      "version": "2.0.4",
      "resolved": "https://registry.npmjs.org/hasown/-/hasown-2.0.4.tgz",
@@ -490,6 +670,42 @@
        "url": "https://opencollective.com/express"
      }
    },
+    "node_modules/https-proxy-agent": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/https-proxy-agent/-/https-proxy-agent-5.0.1.tgz",
+      "integrity": "sha512-dFcAjpTQFgoLMzC2VwU+C/CbS7uRL0lWmxDITmqm7C+7F0Odmj6s9l6alZc6AELXhrnggM2CeWSXHGOdX2YtwA==",
+      "license": "MIT",
+      "dependencies": {
+        "agent-base": "6",
+        "debug": "4"
+      },
+      "engines": {
+        "node": ">= 6"
+      }
+    },
+    "node_modules/https-proxy-agent/node_modules/debug": {
+      "version": "4.4.3",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-4.4.3.tgz",
+      "integrity": "sha512-RGwwWnwQvkVfavKVt22FGLw+xYSdzARwm0ru6DhTVA3umU5hZc28V3kO4stgYryrTlLpuvgI9GiijltAjNbcqA==",
+      "license": "MIT",
+      "dependencies": {
+        "ms": "^2.1.3"
+      },
+      "engines": {
+        "node": ">=6.0"
+      },
+      "peerDependenciesMeta": {
+        "supports-color": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/https-proxy-agent/node_modules/ms": {
+      "version": "2.1.3",
+      "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.3.tgz",
+      "integrity": "sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA==",
+      "license": "MIT"
+    },
    "node_modules/iconv-lite": {
      "version": "0.4.24",
      "resolved": "https://registry.npmjs.org/iconv-lite/-/iconv-lite-0.4.24.tgz",
@@ -592,6 +808,25 @@
      "integrity": "sha512-Tpp60P6IUJDTuOq/5Z8cdskzJujfwqfOTkrwIwj7IRISpnkJnT6SyJ4PCPnGMoFjC9ddhal5KVIYtAt97ix05A==",
      "license": "MIT"
    },
+    "node_modules/multer": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/multer/-/multer-2.2.0.tgz",
+      "integrity": "sha512-6rdyFg2kLrMh9Jee7/BMPuV9lEAd7lLW2YUpF9/YxR7njyoUwwQ0ZPh3TaIY50Sw6vlyD2HW3wGOkTS4P79xrQ==",
+      "license": "MIT",
+      "dependencies": {
+        "append-field": "^1.0.0",
+        "busboy": "^1.6.0",
+        "concat-stream": "^2.0.0",
+        "type-is": "^1.6.18"
+      },
+      "engines": {
+        "node": ">= 10.16.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/express"
+      }
+    },
    "node_modules/negotiator": {
      "version": "0.6.3",
      "resolved": "https://registry.npmjs.org/negotiator/-/negotiator-0.6.3.tgz",
@@ -700,6 +935,15 @@
        "node": ">= 0.10"
      }
    },
+    "node_modules/proxy-from-env": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/proxy-from-env/-/proxy-from-env-2.1.0.tgz",
+      "integrity": "sha512-cJ+oHTW1VAEa8cJslgmUZrc+sjRKgAKl3Zyse6+PV38hZe/V6Z14TbCuXcan9F9ghlz4QrFr2c92TNF82UkYHA==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=10"
+      }
+    },
    "node_modules/qs": {
      "version": "6.15.3",
      "resolved": "https://registry.npmjs.org/qs/-/qs-6.15.3.tgz",
@@ -740,6 +984,20 @@
        "node": ">= 0.8"
      }
    },
+    "node_modules/readable-stream": {
+      "version": "3.6.2",
+      "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-3.6.2.tgz",
+      "integrity": "sha512-9u/sniCrY3D5WdsERHzHE4G2YCXqoG5FTHUiCC4SIbr6XcLZBY05ya9EKjYek9O5xOAwjGq+1JdGBAS7Q9ScoA==",
+      "license": "MIT",
+      "dependencies": {
+        "inherits": "^2.0.3",
+        "string_decoder": "^1.1.1",
+        "util-deprecate": "^1.0.1"
+      },
+      "engines": {
+        "node": ">= 6"
+      }
+    },
    "node_modules/safe-buffer": {
      "version": "5.2.1",
      "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.1.tgz",
@@ -898,6 +1156,23 @@
        "node": ">= 0.8"
      }
    },
+    "node_modules/streamsearch": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/streamsearch/-/streamsearch-1.1.0.tgz",
+      "integrity": "sha512-Mcc5wHehp9aXz1ax6bZUyY5afg9u2rv5cqQI3mRrYkGC8rW2hM02jWuwjtL++LS5qinSyhj2QfLyNsuc+VsExg==",
+      "engines": {
+        "node": ">=10.0.0"
+      }
+    },
+    "node_modules/string_decoder": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.3.0.tgz",
+      "integrity": "sha512-hkRX8U1WjJFd8LsDJ2yQ/wWWxaopEsABU1XfkM8A+j0+85JAGppt16cr1Whg6KIbb4okU6Mql6BOj+uup/wKeA==",
+      "license": "MIT",
+      "dependencies": {
+        "safe-buffer": "~5.2.0"
+      }
+    },
    "node_modules/toidentifier": {
      "version": "1.0.1",
      "resolved": "https://registry.npmjs.org/toidentifier/-/toidentifier-1.0.1.tgz",
@@ -920,6 +1195,12 @@
        "node": ">= 0.6"
      }
    },
+    "node_modules/typedarray": {
+      "version": "0.0.6",
+      "resolved": "https://registry.npmjs.org/typedarray/-/typedarray-0.0.6.tgz",
+      "integrity": "sha512-/aCDEGatGvZ2BIk+HmLf4ifCJFwvKFNb9/JeZPMulfgFracn9QFcAf5GO8B/mweUjSoblS5In0cWhqpfs/5PQA==",
+      "license": "MIT"
+    },
    "node_modules/unpipe": {
      "version": "1.0.0",
      "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
@@ -929,6 +1210,12 @@
        "node": ">= 0.8"
      }
    },
+    "node_modules/util-deprecate": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
+      "integrity": "sha512-EPD5q1uXyFxJpCrLnCc1nHnq3gOa6DZBocAIiI2TaSCA7VCJ1UJDMagCzIkXNsUYfD1daK//LTEQ8xiIbrHtcw==",
+      "license": "MIT"
+    },
    "node_modules/utils-merge": {
      "version": "1.0.1",
      "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
@@ -7,9 +7,11 @@
    "start": "node index.js"
  },
  "dependencies": {
+    "axios": "^1.19.0",
    "cors": "^2.8.5",
    "dotenv": "^16.3.1",
    "express": "^4.18.2",
+    "multer": "^2.2.0",
    "node-fetch": "^3.3.2"
  }
 }
@@ -1,21 +1,115 @@
 const express = require('express');
 const router = express.Router();
+const axios = require('axios');
+
+const reverseMap = {
+  'c': '1B', 'a minor': '1A', 'am': '1A',
+  'g': '2B', 'e minor': '2A', 'em': '2A',
+  'd': '3B', 'b minor': '3A', 'bm': '3A',
+  'a': '4B', 'f# minor': '4A', 'f#m': '4A',
+  'e': '5B', 'c# minor': '5A', 'c#m': '5A',
+  'b': '6B', 'g# minor': '6A', 'g#m': '6A',
+  'f#': '7B', 'd# minor': '7A', 'd#m': '7A',
+  'db': '8B', 'c#': '8B', 'bb minor': '8A', 'a# minor': '8A', 'bbm': '8A',
+  'ab': '9B', 'g#': '9B', 'f minor': '9A', 'fm': '9A',
+  'eb': '10B', 'd#': '10B', 'c minor': '10A', 'cm': '10A',
+  'bb': '11B', 'a#': '11B', 'g minor': '11A', 'gm': '11A',
+  'f': '12B', 'd minor': '12A', 'dm': '12A',
+  'c major': '1B', 'g major': '2B', 'd major': '3B', 'a major': '4B',
+  'e major': '5B', 'b major': '6B', 'f# major': '7B', 'db major': '8B',
+  'ab major': '9B', 'eb major': '10B', 'bb major': '11B', 'f major': '12B'
+};
+
+function standardizeKey(keyString) {
+  if (!keyString) return null;
+  const str = keyString.toLowerCase().trim();
+  return reverseMap[str] || null;
+}

-// Mock metadata route
 router.get('/', async (req, res) => {
-  const track = req.query.track || 'Mock Track';
+  const track = req.query.track;
+  const artist = req.query.artist;
  
-  // In production, this would call GetSongBPM and Last.fm
-  // to fetch BPM, Camelot Key, and genre/mood tags.
-  
-  res.json({
-    status: 'success',
-    data: {
-      key: '4B',
-      bpm: 120,
-      tags: ['Electronic', 'Synthpop']
+  if (!track || !artist) {
+    return res.status(400).json({ error: 'Missing track or artist' });
+  }
+
+  let bpm = null;
+  let camelotKey = null;
+  let tags = [];
+
+  try {
+    // 1. GetSongBPM API
+    if (process.env.GETSONGBPM_API_KEY) {
+      const gsbRes = await axios.get('https://api.getsong.co/search/', {
+        params: {
+          api_key: process.env.GETSONGBPM_API_KEY,
+          type: 'both',
+          lookup: `song:${track} artist:${artist}`
+        }
+      }).catch(err => {
+        console.error('GetSongBPM Error:', err.message);
+        return { data: { search: [] } };
+      });
+      
+      const searchResults = gsbRes.data.search;
+      if (searchResults && searchResults.length > 0) {
+        // get song id
+        const songId = searchResults[0].song_id;
+        if (songId) {
+          const songRes = await axios.get('https://api.getsong.co/song/', {
+             params: { api_key: process.env.GETSONGBPM_API_KEY, id: songId }
+          }).catch(() => ({ data: { song: {} } }));
+          
+          if (songRes.data.song) {
+            bpm = songRes.data.song.tempo;
+            const keyStr = songRes.data.song.key_of;
+            camelotKey = standardizeKey(keyStr);
+          }
+        }
+      }
    }
-  });
+
+    // 2. Last.fm API
+    if (process.env.LASTFM_API_KEY) {
+      const lfmRes = await axios.get('https://ws.audioscrobbler.com/2.0/', {
+        params: {
+          method: 'track.getInfo',
+          api_key: process.env.LASTFM_API_KEY,
+          artist: artist,
+          track: track,
+          format: 'json'
+        }
+      }).catch(err => {
+        console.error('Last.fm Error:', err.message);
+        return { data: {} };
+      });
+      
+      if (lfmRes.data && lfmRes.data.track && lfmRes.data.track.toptags && lfmRes.data.track.toptags.tag) {
+        tags = lfmRes.data.track.toptags.tag
+          .slice(0, 4) // top 4 tags
+          .map(t => t.name.toLowerCase());
+      }
+    }
+    
+    // Fallbacks if APIs failed or didn't find anything
+    if (!bpm) bpm = 120;
+    if (!camelotKey) camelotKey = '8B'; // random default
+    if (tags.length === 0) tags = ['electronic'];
+
+    res.json({
+      status: 'success',
+      data: {
+        key: camelotKey,
+        bpm: Math.round(bpm),
+        tags: tags
+      }
+    });
+
+  } catch (err) {
+    console.error('Metadata error:', err.message);
+    res.status(500).json({ error: 'Failed to fetch metadata' });
+  }
 });

 module.exports = router;
@@ -1,19 +1,98 @@
 const express = require('express');
 const router = express.Router();
+const multer = require('multer');
+const { execFile } = require('child_process');
+const fs = require('fs');
+const os = require('os');
+const path = require('path');
+const axios = require('axios');

-// Mock recognize route
-router.post('/', async (req, res) => {
-  // In production, this would receive an audio buffer, fingerpint it,
-  // and call the AcoustID API.
+// Configure multer to save files to system temp directory
+const upload = multer({ dest: os.tmpdir() });
+
+router.post('/', upload.single('audio'), async (req, res) => {
+  if (!req.file) {
+    return res.status(400).json({ error: 'No audio file uploaded.' });
+  }
+
+  const filePath = req.file.path;
  
-  res.json({
-    status: 'success',
-    data: {
-      title: 'Mock Track',
-      artist: 'Mock Artist',
-      matchScore: '95%'
+  try {
+    // 1. Generate fingerprint using fpcalc
+    const { duration, fingerprint } = await new Promise((resolve, reject) => {
+      execFile('fpcalc', [filePath], (error, stdout, stderr) => {
+        if (error) {
+          return reject(new Error('fpcalc failed: ' + stderr));
+        }
+        
+        let dur = null;
+        let fp = null;
+        
+        stdout.split('\n').forEach(line => {
+          if (line.startsWith('DURATION=')) dur = parseInt(line.split('=')[1], 10);
+          if (line.startsWith('FINGERPRINT=')) fp = line.split('=')[1];
+        });
+        
+        if (!dur || !fp) {
+          return reject(new Error('Invalid fpcalc output'));
+        }
+        
+        resolve({ duration: dur, fingerprint: fp });
+      });
+    });
+
+    // 2. Query AcoustID API
+    const acoustidKey = process.env.ACOUSTID_API_KEY;
+    if (!acoustidKey) {
+      throw new Error('Missing ACOUSTID_API_KEY');
    }
-  });
+
+    const response = await axios.get('https://api.acoustid.org/v2/lookup', {
+      params: {
+        client: acoustidKey,
+        meta: 'recordings',
+        duration: duration,
+        fingerprint: fingerprint
+      }
+    });
+
+    const results = response.data.results;
+    if (!results || results.length === 0) {
+      return res.json({ status: 'not_found' });
+    }
+
+    // Sort results by score (descending)
+    results.sort((a, b) => b.score - a.score);
+    const bestResult = results[0];
+    
+    // Find a recording with title and artists
+    let title = 'Unknown';
+    let artist = 'Unknown';
+    
+    if (bestResult.recordings && bestResult.recordings.length > 0) {
+      const rec = bestResult.recordings[0];
+      title = rec.title || 'Unknown';
+      if (rec.artists && rec.artists.length > 0) {
+        artist = rec.artists.map(a => a.name).join(' & ');
+      }
+    }
+
+    res.json({
+      status: 'success',
+      data: {
+        title: title,
+        artist: artist,
+        matchScore: Math.round(bestResult.score * 100) + '%'
+      }
+    });
+
+  } catch (err) {
+    console.error('Recognition error:', err.message);
+    res.status(500).json({ error: 'Failed to recognize audio' });
+  } finally {
+    // Clean up uploaded file
+    fs.unlink(filePath, () => {});
+  }
 });

 module.exports = router;