Add WebAssembly for VAD (#1281)

wasm/vad/sherpa-onnx-wasm-main-vad.cc

@@ -0,0 +1,45 @@
+// wasm/sherpa-onnx-wasm-main-vad.cc
+//
+// Copyright (c)  2024  Xiaomi Corporation
+#include <stdio.h>
+
+#include <algorithm>
+#include <memory>
+
+#include "sherpa-onnx/c-api/c-api.h"
+
+// see also
+// https://emscripten.org/docs/porting/connecting_cpp_and_javascript/Interacting-with-code.html
+
+extern "C" {
+
+static_assert(sizeof(SherpaOnnxSileroVadModelConfig) == 5 * 4, "");
+
+static_assert(sizeof(SherpaOnnxVadModelConfig) ==
+                  sizeof(SherpaOnnxSileroVadModelConfig) + 4 * 4,
+              "");
+void MyPrint(SherpaOnnxVadModelConfig *config) {
+  auto silero_vad = &config->silero_vad;
+
+  fprintf(stdout, "----------silero_vad config----------\n");
+  fprintf(stdout, "model: %s\n", silero_vad->model);
+  fprintf(stdout, "threshold: %.3f\n", silero_vad->threshold);
+  fprintf(stdout, "min_silence_duration: %.3f\n",
+          silero_vad->min_silence_duration);
+  fprintf(stdout, "min_speech_duration: %.3f\n",
+          silero_vad->min_speech_duration);
+  fprintf(stdout, "window_size: %d\n", silero_vad->window_size);
+
+  fprintf(stdout, "----------config----------\n");
+
+  fprintf(stdout, "sample_rate: %d\n", config->sample_rate);
+  fprintf(stdout, "num_threads: %d\n", config->num_threads);
+
+  fprintf(stdout, "provider: %s\n", config->provider);
+  fprintf(stdout, "debug: %d\n", config->debug);
+}
+
+void CopyHeap(const char *src, int32_t num_bytes, char *dst) {
+  std::copy(src, src + num_bytes, dst);
+}
+}