Emscripten endpoint for finding fundamental frequency

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1 files changed, 25 insertions, 0 deletions

diff --git a/web/main.js b/web/main.js
new file mode 100644
index 0000000..b01340d
--- /dev/null
+++ b/web/main.js
@@ -0,0 +1,25 @@
+// This is read and used by `site.js`
+var Module = {
+    noInitialRun: true,
+    noExitRuntime: true,
+    onRuntimeInitialized: main
+};
+
+function jsArrayToF32ArrayPtr(jsArray) {
+    var data = new Float32Array(jsArray);
+    var nDataBytes = data.length * data.BYTES_PER_ELEMENT;
+    var dataPtr = Module._malloc(nDataBytes);
+
+    var dataHeap = new Uint8Array(Module.HEAPU8.buffer, dataPtr, nDataBytes);
+    dataHeap.set(new Uint8Array(data.buffer));
+    return dataHeap.byteOffset;
+}
+
+function main() {
+    var data = [1, 0, -1, 0, 1, 0, -1, 0, 1, 0, -1, 0, 1, 0, -1, 0];
+    var dataLength = data.length;
+    var ptr = jsArrayToF32ArrayPtr(data);
+
+    var fundamental = _find_fundamental_frequency(ptr, data.length, 44100.0);
+    console.log("Javascript here. Our fundamental frequency according to Rust is " + fundamental + "Hz");
+}