peaks.js/demo/zoomable-waveform.html at master · bbc/peaks.js · 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
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Peaks.js Demo Page</title>
    <link rel="stylesheet" type="text/css" href="style.css">
  </head>
  <body>
    <div id="titles">
      <h1>Peaks.js</h1>
      <p>
        Peaks.js is a JavaScript library that allows you to display and
        interact with audio waveforms in the browser.
      </p>

      <h2>Demo pages</h2>
      <p>
        The following pages demonstrate various configuration options:
      </p>
      <p>
        <a href="/index.html">Precomputed Waveform Data</a> |
        <a href="/webaudio.html">Web Audio API</a> |
        Single Zoomable Waveform |
        <a href="/overview-waveform.html">Single Fixed Waveform</a> |
        <a href="/cue-events.html">Cue Events</a> |
        <a href="/set-source.html">Changing the Media URL</a> |
        <a href="/multi-channel.html">Multi-Channel Waveform</a> |
        <a href="/custom-markers">Custom Point and Segment Markers</a> |
        <a href="/overlay-segments.html">Overlay Segments</a> |
        <a href="/external-player.html">External Audio Player</a> |
        <a href="/scrollbar.html">Scrollbar</a>
      </p>
      <h2>Demo: Single Zoomable Waveform</h2>
      <p>
        This demo shows how configure Peaks.js to render a single zoomable
        waveform view.
      </p>

      <div class="waveform-container">
        <div id="zoomview-container"></div>
      </div>

      <div id="demo-controls">
        <audio id="audio" controls="controls">
          <source src="/TOL_6min_720p_download.mp3" type="audio/mpeg">
          <source src="/TOL_6min_720p_download.ogg" type='audio/ogg; codecs="vorbis"'>
          Your browser does not support the audio element.
        </audio>

        <div id="controls">
          <div>
            <label for="zoom">Zoom:</label>
            <select id="zoom"></select>
            <input type="text" id="seek-time" value="0.0">
            <button data-action="seek">Seek</button>
            <label for="amplitude-scale">Amplitude scale</label>
            <input type="range" id="amplitude-scale" min="0" max="10" step="1">
          </div>
          <div>
            <input type="text" id="start-time" value="0.0">
            <button data-action="set-start-time">Set start time</button>
          </div>
          <div>
            <label for="waveform-color">Waveform color</label>
            <input type="color" id="waveform-color" value="#00e180">
            <label for="played-waveform-color">Played waveform color</label>
            <input type="color" id="played-waveform-color" value="#bc6dfd">
          </div>
          <div>
            <label for="axis-label-color">Axis label color</label>
            <input type="color" id="axis-label-color" value="#aaaaaa">
            <label for="axis-gridline-color">Axis gridline color</label>
            <input type="color" id="axis-gridline-color" value="#cccccc">
          </div>
        </div>
      </div>
    </div>
    <div id="margin-right">
    </div>
    <script src="/peaks.js"></script>
    <script>
      (function(Peaks) {
        var AudioContext = window.AudioContext || window.webkitAudioContext;
        var audioContext = new AudioContext();

        var options = {
          zoomview: {
            container: document.getElementById('zoomview-container'),
            waveformColor: '#00e180',
            playedWaveformColor: '#bc6dfd',
            showPlayheadTime: true
          },
          mediaElement: document.getElementById('audio'),
          webAudio: {
            audioContext: audioContext,
            scale: 128,
            multiChannel: false
          },
          zoomLevels: [128],
          keyboard: true
        };

        Peaks.init(options, function(err, peaksInstance) {
          if (err) {
            console.error(err.message);
            return;
          }

          console.log('Peaks instance ready');

          var zoomview = peaksInstance.views.getView('zoomview');

          var zoomLevels = [5, 10, 20, 30, 60, 120, 180, 'auto'];

          zoomview.setZoom({ seconds: zoomLevels[0] });

          var zoom = document.getElementById('zoom');

          for (var i = 0; i < zoomLevels.length; i++) {
            var text = zoomLevels[i] === 'auto' ? 'Fit width' : (zoomLevels[i] + " seconds");
            zoom.options[i] = new Option(text, i);
          }

          zoom.addEventListener('change', function(event) {
            var zoomLevel = zoomLevels[event.target.value];

            zoomview.setZoom({ seconds: zoomLevel });
          });

          document.querySelector('button[data-action="seek"]').addEventListener('click', function(event) {
            var time = document.getElementById('seek-time').value;
            var seconds = parseFloat(time);

            if (!Number.isNaN(seconds)) {
              peaksInstance.player.seek(seconds);
            }
          });

          var amplitudeScales = {
            "0": 0.0,
            "1": 0.1,
            "2": 0.25,
            "3": 0.5,
            "4": 0.75,
            "5": 1.0,
            "6": 1.5,
            "7": 2.0,
            "8": 3.0,
            "9": 4.0,
            "10": 5.0
          };

          document.getElementById('amplitude-scale').addEventListener('input', function(event) {
            var scale = amplitudeScales[event.target.value];
            var view = peaksInstance.views.getView();

            view.setAmplitudeScale(scale);
          });

          document.getElementById('waveform-color').addEventListener('input', function(event) {
            var view = peaksInstance.views.getView();

            view.setWaveformColor(event.target.value);
          });

          document.getElementById('played-waveform-color').addEventListener('input', function(event) {
            var view = peaksInstance.views.getView();

            view.setPlayedWaveformColor(event.target.value);
          });

          document.getElementById('axis-label-color').addEventListener('input', function(event) {
            var view = peaksInstance.views.getView();

            view.setAxisLabelColor(event.target.value);
          });

          document.getElementById('axis-gridline-color').addEventListener('input', function(event) {
            var view = peaksInstance.views.getView();

            view.setAxisGridlineColor(event.target.value);
          });

          document.querySelector('button[data-action="set-start-time"]').addEventListener('click', function(event) {
            var time = document.getElementById('start-time').value;
            var seconds = parseFloat(time);

            if (!Number.isNaN(seconds)) {
              var view = peaksInstance.views.getView();

              view.setStartTime(seconds);
            }
          });

          // Zoomview waveform events

          peaksInstance.on('zoomview.update', function(event) {
            console.log('zoomview.update:', event);
          });
        });
      })(peaks);
    </script>
  </body>
</html>