update: 听歌识曲接口完善, 补充demo页面

2026-10-24 08:31:23 +08:00 · 2023-09-10 15:30:59 +08:00
parent 37bad1cc33
commit 70db662026
11 changed files with 1941 additions and 7 deletions
@@ -0,0 +1,49 @@
+/* AudioWorkletProcesser must be initialized as modules (i.e. seperate files)
+ *  Ref : https://developer.mozilla.org/en-US/docs/Web/API/AudioWorkletProcessor
+ */
+class TimedRecorder extends AudioWorkletProcessor {
+  constructor(options) {
+    super()
+    this.max_length = 0
+    this.recbuffer = new Float32Array()
+    this.recording = false
+    this.buf_index = 0
+    this.port.onmessage = (event) => {
+      switch (event.data.message) {
+        case 'start':
+          this.max_length = event.data.duration * 8000
+          this.recbuffer = new Float32Array(this.max_length)
+          this.buf_index = 0
+          this.recording = true
+          this.port.postMessage({ message: '[rec.js] Recording started' })
+          break
+      }
+    }
+  }
+  process(inputs) {
+    // Only take care of channel 0 (Left)
+    if (this.recording) {
+      let channelL = inputs[0][0]
+      this.port.postMessage({
+        message: 'bufferhealth',
+        health: this.buf_index / this.max_length,
+        recording: this.recbuffer,
+      })
+      if (this.buf_index + channelL.length > this.max_length) {
+        this.port.postMessage({ message: '[rec.js] Recording finished' })
+        this.recording = false
+        this.buf_index = 0
+        this.port.postMessage({
+          message: 'finished',
+          recording: this.recbuffer,
+        })
+      } else {
+        this.recbuffer.set(channelL, this.buf_index)
+        this.buf_index += channelL.length
+      }
+    }
+    return true
+  }
+}
+
+registerProcessor('timed-recorder', TimedRecorder)