blastbeat-detector/index.html at main · MutilatedPeripherals/blastbeat-detector · GitHub

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<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <link rel="shortcut icon" href="./assets/favicon.ico" type="image/x-icon">
    <link rel="icon" href="./assets/favicon.ico" type="image/x-icon">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>BlastViz</title>
    <script src="https://unpkg.com/jszip@3.10.1/dist/jszip.min.js"></script>
    <script src="https://unpkg.com/wavesurfer.js@7/dist/wavesurfer.min.js"></script>
    <script src="https://unpkg.com/wavesurfer.js@7/dist/plugins/regions.min.js"></script>
    <script src="https://unpkg.com/wavesurfer.js@7/dist/plugins/spectrogram.min.js"></script>
    <style>
        body {
            font-family: sans-serif;
            margin: 20px;
        }

        #controls {
            margin-top: 10px;
            margin-bottom: 10px;
            display: none;
            padding-left: 0px;
        }

        #zipInput {
            margin-right: 10px;
        }

        #waveform,
        #spectrogram {
            width: 100%;
            height: 150px;
            margin-top: 10px;
            margin-bottom: 10px;
        }

        #track-info {
            margin-top: 10px;
            font-style: italic;
            color: #444;
            font-size: 0.9em;
        }

        #currentTime {
            margin-top: 10px;
            font-family: monospace;
            font-size: 2em;
        }

        #seenCount {
            margin-top: 10px;
            margin-bottom: 10px;
            font-weight: bold;
            display: inline-block;
        }

        .radio-group {
            margin-top: 10px;
            margin-bottom: 10px;
        }

        .load-control {
            margin-top: 5px;
            margin-bottom: 15px;
        }

        #mobile-controls {
            display: none;
            margin-top: 10px;
            margin-bottom: 15px;
            gap: 10px;
            justify-content: start;
        }

        @media (max-width: 768px) {
            #mobile-controls {
                display: flex;
            }
        }

        #loadingWaveform,
        #loadingSpectrogram {
            display: none;
            font-style: italic;
            color: #666;
            text-align: center;
        }

        @keyframes blastbeatFlash {
            0% {
                color: green;
                transform: scale(1.1);
            }

            75% {
                color: inherit;
                transform: scale(1.01);
            }

            100% {
                color: inherit;
                transform: scale(1);
            }
        }

        .blastbeat-animate {
            animation: blastbeatFlash 0.25s ease;
        }

        .github-corner {
            position: fixed;
            top: 0;
            right: 0;
            z-index: 1000
        }

        .github-corner svg {
            fill: #151513;
            color: #fff
        }
    </style>
</head>

<body>
    <h2>BlastViz</h2>
    <h4>Blastbeat Detection Visualizer</h4>
    <a href="https://github.com/MutilatedPeripherals/blastbeat-detector" class="github-corner"
        aria-label="View source on GitHub" target="_blank">
        <svg width="80" height="80" viewBox="0 0 250 250" aria-hidden="true">
            <path d="M0 0h250v250" fill="#151513" />
            <path
                d="M128 109c-15-4-18-11-18-11s-4-7-10-9c-5-2 0-3 0-3 6 0 11 6 11 6 5 9 14 6 17 5c1-4 3-6 5-8c-12-1-24-6-24-27c0-6 2-11 6-15c-1-2-3-8 1-16c0 0 5-2 16 6c5-1 10-2 15-2s10 1 15 2c11-8 16-6 16-6c4 8 2 14 1 16c4 4 6 9 6 15c0 21-12 26-24 27c3 2 6 7 6 14v21"
                fill="#fff" />
        </svg>
    </a>
    <div id="explainer">
        <hr>
        <p><i><strong>Warning:</strong> This is not a stand-alone tool. The visualizer expects a ZIP file containing an
                audio
                file (MP3 or WAV), a JSON file with the identified blast-beat sections, and optionally a drum-only audio
                track.</i>
        </p>
        <p><i>Expected JSON structure:</i></p>
        <pre>
    {
      "blast_beats": [
        {"start_time": 12.5, "end_time": 15.0},
        {"start_time": 30.0, "end_time": 32.5},
        ...
      ]
    }
    </pre>
        <p>Try this notebook to process some songs using Google's free-tier
            GPUs: <a target="_blank"
                href="https://colab.research.google.com/gist/linomp/9a3cc6bfeda5ef3a09358ea29cc5363c/blastbeat_detector_notebook.ipynb">
                <img src="https://colab.research.google.com/assets/colab-badge.svg" alt="Open In Colab" />
            </a>
        </p>
        <p>Or directly download some processed song examples from <a
                href="https://drive.google.com/drive/folders/1YFoxrsrBo8hl0cOYkdxCsfW_bf3CX7Al?usp=drive_link"
                target="_blank">this Google Drive folder</a>
        </p>
    </div>
    <div class="load-control">
        <input type="file" id="zipInput" accept=".zip">
    </div>
    <hr>
    <div class="radio-group">
        <label><input type="radio" name="trackType" value="full" checked> Full Band</label>
        <label><input type="radio" name="trackType" value="drums"> Drums Only</label>
    </div>
    <hr>
    <div id="track-info">
        <span id="audioPath"></span> <span id="snareFreq"></span> <span id="bassdrumFreq"></span>
    </div>
    <div id="controls">
        <div id="seenCount">Blastbeat count: 0</div>
        <div id="currentTime">0:00:000</div>
        <div id="mobile-controls">
            <button id="playPauseBtn">Play/Pause</button>
            <button id="zoomInBtn">Zoom In</button>
            <button id="zoomOutBtn">Zoom Out</button>
        </div>
    </div>
    <div id="waveform" title="Space bar: play/pause -- Mouse wheel: zoom in/out"></div>
    <div id="loadingWaveform">Rendering waveform...</div>
    <div id="spectrogram"></div>
    <div id="loadingSpectrogram">Rendering spectrogram...</div>
    <script>
        let wavesurfer = null;
        let audioReady = false;
        let currentZipFile = null;
        let zoomLevel = 0;

        function applyZoom() {
            if (wavesurfer) {
                wavesurfer.zoom(zoomLevel);
            }
        }

        function handleWheelZoom(e) {
            if (!wavesurfer) return
            e.preventDefault();
            zoomLevel += e.deltaY < 0 ? 10 : -10;
            zoomLevel = Math.max(0, Math.min(zoomLevel, 200));
            applyZoom();
        }

        function initWaveSurfer(audioFile, intervals) {
            let seenCount = 0;
            let streak = 0;
            let lastStreakChange = 0;

            if (wavesurfer) {
                wavesurfer.destroy()
                document.getElementById('waveform').innerHTML = ""
                document.getElementById('spectrogram').innerHTML = ""
                document.getElementById('currentTime').textContent = "0:00:000"
                document.getElementById('seenCount').textContent = "Blastbeat count: 0"
            }

            const lw = document.getElementById('loadingWaveform');
            const ls = document.getElementById('loadingSpectrogram');
            lw.style.display = 'block';
            ls.style.display = 'block';

            const regions = WaveSurfer.Regions.create();

            const spectrogram = WaveSurfer.Spectrogram.create({
                container: '#spectrogram',
                labels: true,
                frequencyMax: 600,
                scale: 'mel',
                rangeDB: 60,
                gainDB: 20,
                windowFunc: 'hann',
                colorMap: 'roseus',
                fftSamples: 256
            })
            spectrogram.on('render', () => ls.style.display = 'none')

            wavesurfer = WaveSurfer.create({
                container: '#waveform',
                waveColor: '#000',
                progressColor: '#888',
                cursorColor: '#f00',
                height: 150,
                plugins: [regions, spectrogram]
            })
            wavesurfer.load(audioFile)

            wavesurfer.on('ready', () => {
                lw.style.display = 'none'
                document.getElementById('explainer').style.display = 'none'
                document.getElementById('controls').style.display = 'block'
                audioReady = true
                intervals.forEach(({ start_time, end_time }) =>
                    regions.addRegion({
                        start: start_time,
                        end: end_time,
                        color: 'rgba(2,247,7,0.3)',
                        drag: false,
                        resize: false
                    })
                )
            })
            wavesurfer.on('timeupdate', t => {
                const m = Math.floor(t / 60);
                const s = Math.floor(t % 60);
                const ms = Math.floor((t % 1) * 1000);

                // Update time display
                document.getElementById('currentTime').textContent =
                    `${m}:${s.toString().padStart(2, '0')}:${ms.toString().padStart(3, '0')}`;

                // Update blastbeat count
                const newCount = intervals.filter(b => t > b.start_time).length;
                if (newCount !== seenCount) {
                    streak++;
                    lastStreakChange = t;
                    seenCount = newCount;
                    const countEl = document.getElementById('seenCount');
                    countEl.textContent = `Blastbeat count: ${seenCount} ${streak > 3 ? '🔥🔥🔥' : ''} ${streak > 10 ? '🥵🥵🥵' : ''}`;
                    countEl.classList.remove('blastbeat-animate');
                    void countEl.offsetWidth;
                    countEl.classList.add('blastbeat-animate');
                } else {
                    if (t - lastStreakChange >= 4) {
                        streak = 0;
                        document.getElementById('seenCount').textContent = `Blastbeat count: ${seenCount}`;
                    }
                }
            })

            document.getElementById('waveform').addEventListener('wheel', handleWheelZoom, { passive: false });
            document.getElementById('spectrogram').addEventListener('wheel', handleWheelZoom, { passive: false });
        }


        async function loadZip(zipFile) {
            const zip = await JSZip.loadAsync(zipFile)
            const jsonFile = Object.keys(zip.files).find(n => n.endsWith('.json'))
            if (!jsonFile) return alert("No JSON found in zip")
            const config = JSON.parse(await zip.files[jsonFile].async('string'))
            const intervals = config.blast_beats || []
            const trackType = document.querySelector('input[name="trackType"]:checked').value
            let audioFile = null
            if (trackType === "drums") {
                audioFile = Object.keys(zip.files).find(n => /_drums\.(mp3|wav)$/i.test(n))
                if (!audioFile) return alert("Drums-only file (_drums) not found in zip")
            } else {
                audioFile = Object.keys(zip.files).find(n => /\.(mp3|wav)$/i.test(n) && !/_drums\./i.test(n))
            }
            if (!audioFile) return alert("No audio file found in zip")
            const audioURL = URL.createObjectURL(await zip.files[audioFile].async('blob'))
            document.getElementById('audioPath').textContent = "Track: " + audioFile
            if (config.snare_frequency !== undefined)
                document.getElementById('snareFreq').textContent = "| Snare drum freq: " + config.snare_frequency.toFixed(2) + " Hz"
            if (config.bass_drum_frequency !== undefined)
                document.getElementById('bassdrumFreq').textContent = "| Bass drum freq: " + config.bass_drum_frequency.toFixed(2) + " Hz"
            initWaveSurfer(audioURL, intervals)
        }

        document.getElementById('zipInput').addEventListener('change', e => {
            const f = e.target.files[0]
            if (!f) return
            currentZipFile = f
            loadZip(f)
        })

        document.querySelectorAll('input[name="trackType"]').forEach(r =>
            r.addEventListener('change', () => currentZipFile && loadZip(currentZipFile))
        )

        document.addEventListener('keydown', e => {
            if (e.code === 'Space' && audioReady) {
                e.preventDefault()
                wavesurfer.playPause()
            }
        })

        document.getElementById('playPauseBtn').addEventListener('click', () => {
            if (audioReady) wavesurfer.playPause()
        })

        document.getElementById('zoomInBtn').addEventListener('click', () => {
            zoomLevel = Math.min(200, zoomLevel + 10)
            applyZoom()
        })

        document.getElementById('zoomOutBtn').addEventListener('click', () => {
            zoomLevel = Math.max(0, zoomLevel - 10)
            applyZoom()
        })
    </script>
</body>

</html>