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| 61 | + </div> |
| 62 | + |
| 63 | + <h1>API Reference</h1> |
| 64 | + <p class="lead">Complete reference for the decibri-web browser API. For installation and basic usage, see <a href="index.html">Getting Started</a>.</p> |
| 65 | + |
| 66 | + <h2>Constructor</h2> |
| 67 | + <h3><code>new Decibri(options?)</code></h3> |
| 68 | + <p>Creates a new capture instance. Does not start capture. Call <code>start()</code> to begin.</p> |
| 69 | + <pre><code class="language-javascript">import { Decibri } from 'decibri-web'; |
| 70 | +const mic = new Decibri(options?);</code></pre> |
| 71 | + |
| 72 | + <div class="table-wrap"> |
| 73 | + <table> |
| 74 | + <thead> |
| 75 | + <tr> |
| 76 | + <th>Option</th> |
| 77 | + <th>Type</th> |
| 78 | + <th>Default</th> |
| 79 | + <th>Description</th> |
| 80 | + </tr> |
| 81 | + </thead> |
| 82 | + <tbody> |
| 83 | + <tr> |
| 84 | + <td><code>sampleRate</code></td> |
| 85 | + <td><code>number</code></td> |
| 86 | + <td><code>16000</code></td> |
| 87 | + <td>Target sample rate in Hz (1,000 to 384,000)</td> |
| 88 | + </tr> |
| 89 | + <tr> |
| 90 | + <td><code>channels</code></td> |
| 91 | + <td><code>number</code></td> |
| 92 | + <td><code>1</code></td> |
| 93 | + <td>Number of channels (browsers reliably support 1)</td> |
| 94 | + </tr> |
| 95 | + <tr> |
| 96 | + <td><code>framesPerBuffer</code></td> |
| 97 | + <td><code>number</code></td> |
| 98 | + <td><code>1600</code></td> |
| 99 | + <td>Frames per chunk. 1,600 at 16 kHz = 100 ms chunks (64 to 65,536)</td> |
| 100 | + </tr> |
| 101 | + <tr> |
| 102 | + <td><code>device</code></td> |
| 103 | + <td><code>string</code></td> |
| 104 | + <td>system default</td> |
| 105 | + <td><code>deviceId</code> string from <code>Decibri.devices()</code></td> |
| 106 | + </tr> |
| 107 | + <tr> |
| 108 | + <td><code>format</code></td> |
| 109 | + <td><code>'int16' | 'float32'</code></td> |
| 110 | + <td><code>'int16'</code></td> |
| 111 | + <td>Sample encoding format</td> |
| 112 | + </tr> |
| 113 | + <tr> |
| 114 | + <td><code>vad</code></td> |
| 115 | + <td><code>boolean</code></td> |
| 116 | + <td><code>false</code></td> |
| 117 | + <td>Enable voice activity detection</td> |
| 118 | + </tr> |
| 119 | + <tr> |
| 120 | + <td><code>vadThreshold</code></td> |
| 121 | + <td><code>number</code></td> |
| 122 | + <td><code>0.01</code></td> |
| 123 | + <td>RMS energy threshold for speech detection (0 to 1)</td> |
| 124 | + </tr> |
| 125 | + <tr> |
| 126 | + <td><code>vadHoldoff</code></td> |
| 127 | + <td><code>number</code></td> |
| 128 | + <td><code>300</code></td> |
| 129 | + <td>Milliseconds of sub-threshold audio before <code>'silence'</code> is emitted</td> |
| 130 | + </tr> |
| 131 | + <tr> |
| 132 | + <td><code>echoCancellation</code></td> |
| 133 | + <td><code>boolean</code></td> |
| 134 | + <td><code>true</code></td> |
| 135 | + <td>Browser echo cancellation. Set <code>false</code> for music/tuner apps</td> |
| 136 | + </tr> |
| 137 | + <tr> |
| 138 | + <td><code>noiseSuppression</code></td> |
| 139 | + <td><code>boolean</code></td> |
| 140 | + <td><code>true</code></td> |
| 141 | + <td>Browser noise suppression. Set <code>false</code> for raw signal</td> |
| 142 | + </tr> |
| 143 | + <tr> |
| 144 | + <td><code>workletUrl</code></td> |
| 145 | + <td><code>string</code></td> |
| 146 | + <td>(inline Blob URL)</td> |
| 147 | + <td>URL for AudioWorklet processor file. Override if CSP blocks <code>blob:</code> URLs</td> |
| 148 | + </tr> |
| 149 | + </tbody> |
| 150 | + </table> |
| 151 | + </div> |
| 152 | + |
| 153 | + <h2>Methods</h2> |
| 154 | + |
| 155 | + <h3><code>mic.start()</code></h3> |
| 156 | + <p>Returns <code>Promise<void></code>. Requests microphone permission and begins capture. Must be called from a user gesture in Safari. No-op if already started. Rejects with a clear error on permission denial.</p> |
| 157 | + |
| 158 | + <h3><code>mic.stop()</code></h3> |
| 159 | + <p>Stops capture and releases all resources (tracks, context, nodes). Safe to call anytime, including before <code>start()</code> or multiple times. Emits <code>'end'</code> then <code>'close'</code>.</p> |
| 160 | + |
| 161 | + <h2>Properties</h2> |
| 162 | + |
| 163 | + <h3><code>mic.isOpen</code></h3> |
| 164 | + <p><code>boolean</code> (read-only). Returns <code>true</code> while actively capturing audio.</p> |
| 165 | + |
| 166 | + <h2>Static methods</h2> |
| 167 | + |
| 168 | + <h3><code>Decibri.devices()</code></h3> |
| 169 | + <p>Returns <code>Promise<DeviceInfo[]></code>. Lists available audio input devices. Labels may be empty before microphone permission is granted.</p> |
| 170 | + <pre><code class="language-javascript">const devices = await Decibri.devices(); |
| 171 | +console.log(devices); |
| 172 | +// [ |
| 173 | +// { deviceId: 'abc123', label: 'Built-in Microphone', groupId: 'g1' }, |
| 174 | +// ... |
| 175 | +// ]</code></pre> |
| 176 | + |
| 177 | + <h3><code>Decibri.version()</code></h3> |
| 178 | + <p>Returns version information for decibri-web.</p> |
| 179 | + <pre><code class="language-javascript">Decibri.version(); |
| 180 | +// { decibriWeb: '0.1.0' }</code></pre> |
| 181 | + |
| 182 | + <h2>Events</h2> |
| 183 | + |
| 184 | + <div class="table-wrap"> |
| 185 | + <table> |
| 186 | + <thead> |
| 187 | + <tr> |
| 188 | + <th>Event</th> |
| 189 | + <th>Payload</th> |
| 190 | + <th>Description</th> |
| 191 | + </tr> |
| 192 | + </thead> |
| 193 | + <tbody> |
| 194 | + <tr> |
| 195 | + <td><code>'data'</code></td> |
| 196 | + <td><code>Int16Array</code> or <code>Float32Array</code></td> |
| 197 | + <td>Audio chunk. Format depends on <code>format</code> option. Emitted ~10 times/sec at default settings.</td> |
| 198 | + </tr> |
| 199 | + <tr> |
| 200 | + <td><code>'error'</code></td> |
| 201 | + <td><code>Error</code></td> |
| 202 | + <td>Permission denied, worklet load failure, AudioContext creation failure.</td> |
| 203 | + </tr> |
| 204 | + <tr> |
| 205 | + <td><code>'end'</code></td> |
| 206 | + <td>(none)</td> |
| 207 | + <td>Emitted after <code>stop()</code>.</td> |
| 208 | + </tr> |
| 209 | + <tr> |
| 210 | + <td><code>'close'</code></td> |
| 211 | + <td>(none)</td> |
| 212 | + <td>Emitted after <code>stop()</code>, after <code>'end'</code>.</td> |
| 213 | + </tr> |
| 214 | + <tr> |
| 215 | + <td><code>'speech'</code></td> |
| 216 | + <td>(none)</td> |
| 217 | + <td>VAD: RMS energy crossed threshold. Requires <code>vad: true</code>.</td> |
| 218 | + </tr> |
| 219 | + <tr> |
| 220 | + <td><code>'silence'</code></td> |
| 221 | + <td>(none)</td> |
| 222 | + <td>VAD: sub-threshold audio for <code>vadHoldoff</code> ms. Requires <code>vad: true</code>.</td> |
| 223 | + </tr> |
| 224 | + </tbody> |
| 225 | + </table> |
| 226 | + </div> |
| 227 | + |
| 228 | + <h2>Types</h2> |
| 229 | + <pre><code class="language-javascript">// DeviceInfo |
| 230 | +{ |
| 231 | + deviceId: string, |
| 232 | + label: string, |
| 233 | + groupId: string, |
| 234 | +} |
| 235 | + |
| 236 | +// VersionInfo |
| 237 | +{ |
| 238 | + decibriWeb: string, |
| 239 | +}</code></pre> |
| 240 | + |
| 241 | + <h2>Differences from decibri (Node.js)</h2> |
| 242 | + <div class="table-wrap"> |
| 243 | + <table> |
| 244 | + <thead> |
| 245 | + <tr> |
| 246 | + <th>Feature</th> |
| 247 | + <th>Node.js <code>decibri</code></th> |
| 248 | + <th><code>decibri-web</code></th> |
| 249 | + <th>Notes</th> |
| 250 | + </tr> |
| 251 | + </thead> |
| 252 | + <tbody> |
| 253 | + <tr> |
| 254 | + <td>Class name</td> |
| 255 | + <td><code>Decibri</code></td> |
| 256 | + <td><code>Decibri</code></td> |
| 257 | + <td>Identical</td> |
| 258 | + </tr> |
| 259 | + <tr> |
| 260 | + <td>Constructor</td> |
| 261 | + <td>Sync, capture starts on read</td> |
| 262 | + <td>Sync, requires <code>await start()</code></td> |
| 263 | + <td>Browser needs async permission</td> |
| 264 | + </tr> |
| 265 | + <tr> |
| 266 | + <td><code>'data'</code> payload</td> |
| 267 | + <td><code>Buffer</code></td> |
| 268 | + <td><code>Int16Array</code> / <code>Float32Array</code></td> |
| 269 | + <td>Different types, same PCM data</td> |
| 270 | + </tr> |
| 271 | + <tr> |
| 272 | + <td><code>devices()</code></td> |
| 273 | + <td>Sync</td> |
| 274 | + <td>Async (returns Promise)</td> |
| 275 | + <td>Browser API is async</td> |
| 276 | + </tr> |
| 277 | + <tr> |
| 278 | + <td><code>device</code> option</td> |
| 279 | + <td>Number index or name substring</td> |
| 280 | + <td>String <code>deviceId</code> only</td> |
| 281 | + <td>Browser uses opaque device IDs</td> |
| 282 | + </tr> |
| 283 | + <tr> |
| 284 | + <td><code>version()</code></td> |
| 285 | + <td><code>{ decibri, portaudio }</code></td> |
| 286 | + <td><code>{ decibriWeb }</code></td> |
| 287 | + <td>Different runtime info</td> |
| 288 | + </tr> |
| 289 | + <tr> |
| 290 | + <td><code>echoCancellation</code></td> |
| 291 | + <td>N/A</td> |
| 292 | + <td><code>boolean</code> (default <code>true</code>)</td> |
| 293 | + <td>Browser-only option</td> |
| 294 | + </tr> |
| 295 | + <tr> |
| 296 | + <td><code>noiseSuppression</code></td> |
| 297 | + <td>N/A</td> |
| 298 | + <td><code>boolean</code> (default <code>true</code>)</td> |
| 299 | + <td>Browser-only option</td> |
| 300 | + </tr> |
| 301 | + <tr> |
| 302 | + <td><code>'backpressure'</code> event</td> |
| 303 | + <td>Available</td> |
| 304 | + <td>Not available</td> |
| 305 | + <td>No browser equivalent</td> |
| 306 | + </tr> |
| 307 | + <tr> |
| 308 | + <td><code>pipe()</code> / streams</td> |
| 309 | + <td>Full Readable stream</td> |
| 310 | + <td>Not available</td> |
| 311 | + <td>Browser has no Node streams</td> |
| 312 | + </tr> |
| 313 | + <tr> |
| 314 | + <td><code>sampleRate</code></td> |
| 315 | + <td>Any (PortAudio resamples)</td> |
| 316 | + <td>Any (AudioWorklet resamples)</td> |
| 317 | + <td>Same behavior</td> |
| 318 | + </tr> |
| 319 | + <tr> |
| 320 | + <td><code>format</code></td> |
| 321 | + <td><code>'int16'</code> or <code>'float32'</code></td> |
| 322 | + <td><code>'int16'</code> or <code>'float32'</code></td> |
| 323 | + <td>Identical</td> |
| 324 | + </tr> |
| 325 | + <tr> |
| 326 | + <td>VAD (<code>speech</code>/<code>silence</code>)</td> |
| 327 | + <td>RMS-based</td> |
| 328 | + <td>RMS-based (same algorithm)</td> |
| 329 | + <td>Identical</td> |
| 330 | + </tr> |
| 331 | + </tbody> |
| 332 | + </table> |
| 333 | + </div> |
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