test(asr): [PKG-ASR-05] checkpoint local editor and adjacent core coverage

docs/assets/example/asr.local.js

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+/* global Artplayer, artplayerPluginAsr */
+// Local audio capture demo. The subtitles below are simulated, not recognized speech.
+// No audio is uploaded; only the sample media is loaded from this local site.
+const statistics = document.createElement('div')
+statistics.textContent = 'Local ASR demo: press play. No recognition service is used.'
+let chunks = 0
+let pcmBytes = 0
+let wavBytes = 0
+
+const art = new Artplayer({
+  container: '.artplayer-app',
+  url: '/assets/sample/steve-jobs.mp4',
+  autoSize: true,
+  fullscreen: true,
+  fullscreenWeb: true,
+  layers: [{
+    name: 'asr-local-statistics',
+    html: statistics,
+    style: {
+      position: 'absolute',
+      top: '12px',
+      left: '12px',
+      right: '12px',
+      padding: '8px 12px',
+      background: 'rgba(0, 0, 0, 0.65)',
+      color: '#fff',
+      fontSize: '12px',
+      whiteSpace: 'pre-line',
+      pointerEvents: 'none',
+    },
+  }],
+  controls: [{
+    name: 'asr-local-stop',
+    position: 'right',
+    html: 'Stop ASR',
+    tooltip: 'Stop capture; pause and play to restart',
+    async click() {
+      await art.plugins.artplayerPluginAsr.stop()
+      if (!art.isDestroy)
+        statistics.textContent = 'Local capture stopped. Pause and play to restart. Nothing was uploaded.'
+    },
+  }],
+  plugins: [artplayerPluginAsr({
+    length: 2,
+    interval: 250,
+    sampleRate: 16000,
+    autoHideTimeout: 5000,
+    onAudioChunk({ pcm, wav }) {
+      if (art.isDestroy)
+        return
+      chunks++
+      pcmBytes += pcm.byteLength
+      wavBytes += wav.byteLength
+      const sampleRate = new DataView(wav).getUint32(24, true)
+      const samples = new DataView(pcm)
+      let peak = 0
+      for (let offset = 0; offset < pcm.byteLength; offset += 2)
+        peak = Math.max(peak, Math.abs(samples.getInt16(offset, true)))
+      const duration = (pcmBytes / 2 / sampleRate).toFixed(2)
+      statistics.textContent = [
+        'Local capture only - simulated subtitles, no speech recognition',
+        `Chunks: ${chunks} | ${sampleRate} Hz mono PCM16 | ${duration} seconds captured`,
+        `PCM: ${pcmBytes} bytes | WAV: ${wavBytes} bytes | Current peak: ${peak}`,
+      ].join('\n')
+      return `Simulated local subtitle: audio chunk ${chunks} received.`
+    },
+  })],
+})