waveform-playlist/examples/dawcore-tone/midi-load.html at main · naomiaro/waveform-playlist · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <title>dawcore + Tone.js — Load MIDI</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      background: #0f0f1a;
      color: #e0d4c8;
      padding: 24px;
    }
    h1 { font-size: 1.2rem; margin-bottom: 16px; }
    daw-editor {
      --daw-wave-color: #c49a6c;
      --daw-playhead-color: #d08070;
      --daw-background: #1a1a2e;
      --daw-track-background: #16213e;
      --daw-ruler-color: #c49a6c;
      --daw-ruler-background: #0f0f1a;
      --daw-piano-roll-note-color: #2a7070;
      --daw-piano-roll-selected-note-color: #3d9e9e;
      --daw-piano-roll-background: #1a1a2e;
      margin-bottom: 12px;
    }
    .toolbar { display: flex; gap: 12px; align-items: center; margin-bottom: 12px; }
    daw-transport { display: flex; gap: 8px; }
    #log {
      margin-top: 12px;
      font-family: monospace;
      font-size: 0.75rem;
      color: #888;
      max-height: 160px;
      overflow-y: auto;
    }
    button { padding: 6px 12px; }
  </style>
</head>
<body>
  <h1>dawcore + Tone.js — Load a .mid file</h1>

  <script type="module">import '@dawcore/components';</script>

  <div class="toolbar">
    <button id="load-url">Load from URL</button>
    <label>
      Load file:
      <input id="load-file" type="file" accept=".mid,.midi" />
    </label>
  </div>

  <daw-editor id="editor" samples-per-pixel="2048" wave-height="120" timescale>
    <daw-keyboard-shortcuts playback></daw-keyboard-shortcuts>
  </daw-editor>

  <daw-transport for="editor">
    <daw-play-button></daw-play-button>
    <daw-pause-button></daw-pause-button>
    <daw-stop-button></daw-stop-button>
  </daw-transport>

  <div id="log"></div>

  <script type="module">
    import { createToneAdapter } from '@waveform-playlist/playout';

    const editor = document.getElementById('editor');
    editor.adapter = createToneAdapter({ ppqn: 960 });

    const log = document.getElementById('log');
    function addLog(msg) {
      const line = document.createElement('div');
      line.textContent = msg;
      log.prepend(line);
      while (log.children.length > 30) log.lastChild.remove();
    }

    editor.addEventListener('daw-track-ready', (e) => addLog('track-ready: ' + e.detail.trackId));
    editor.addEventListener('daw-error', (e) => addLog('error: ' + e.detail.operation + ' — ' + String(e.detail.error)));

    async function loadMidi(source) {
      try {
        const result = await editor.loadMidi(source);
        addLog('loaded ' + result.trackIds.length + ' track(s); bpm=' + result.bpm.toFixed(1) + ' ts=' + result.timeSignature.join('/'));
        // Apply tempo / time signature from the file (caller decides).
        editor.bpm = result.bpm;
        editor.timeSignature = result.timeSignature;
      } catch (err) {
        // Cancellation isn't a failure — surface it differently.
        if (err && err.name === 'AbortError') {
          addLog('loadMidi cancelled');
          return;
        }
        // Log the full Error (with stack + cause chain) to DevTools — the
        // on-screen log is plain text and loses structured detail.
        console.error('[loadMidi]', err);
        addLog('loadMidi failed: ' + String(err));
      }
    }

    document.getElementById('load-url').addEventListener('click', () => {
      loadMidi('/media/midi/RedHotChiliPeppers-Otherside.mid');
    });

    document.getElementById('load-file').addEventListener('change', (e) => {
      const file = e.target.files?.[0];
      if (file) loadMidi(file);
    });
  </script>
</body>
</html>