Add WebAssembly (WASM) for speech enhancement GTCRN models (#2002)

wasm/nodejs/CMakeLists.txt

@@ -84,6 +84,7 @@ set(exported_functions
   #
   SherpaOnnxFileExists
   SherpaOnnxReadWave
+  SherpaOnnxReadWaveFromBinaryData
   SherpaOnnxFreeWave
   SherpaOnnxWriteWave
 )

wasm/nodejs/sherpa-onnx-wave.js

@@ -12,6 +12,36 @@ function readWave(filename, Module) {
   Module._free(pFilename);
 
 
+  const samplesPtr = Module.HEAP32[w / 4] / 4;
+  const sampleRate = Module.HEAP32[w / 4 + 1];
+  const numSamples = Module.HEAP32[w / 4 + 2];
+
+  const samples = new Float32Array(numSamples);
+  for (let i = 0; i < numSamples; i++) {
+    samples[i] = Module.HEAPF32[samplesPtr + i];
+  }
+
+  Module._SherpaOnnxFreeWave(w);
+
+  return {samples: samples, sampleRate: sampleRate};
+}
+
+function readWaveFromBinaryData(uint8Array) {
+  const numBytes = uint8Array.length * uint8Array.BYTES_PER_ELEMENT;
+  const pointer = this.Module._malloc(numBytes);
+
+  const dataOnHeap = new Uint8Array(Module.HEAPU8.buffer, pointer, numBytes);
+  dataOnHeap.set(uint8Array);
+
+  const w = this.Module._SherpaOnnxReadWaveFromBinaryData(
+      dataOnHeap.byteOffset, numBytes);
+  if (w == 0) {
+    console.log('Failed to read wave from binary data');
+    return null;
+  }
+
+  this.Module._free(pointer);
+
   const samplesPtr = Module.HEAP32[w / 4] / 4;
   const sampleRate = Module.HEAP32[w / 4 + 1];
   const numSamples = Module.HEAP32[w / 4 + 2];
@@ -53,5 +83,6 @@ if (typeof process == 'object' && typeof process.versions == 'object' &&
   module.exports = {
     readWave,
     writeWave,
+    readWaveFromBinaryData,
   };
 }