return timestamps for WebAssembly (#737)

wasm/asr/CMakeLists.txt

@@ -13,10 +13,14 @@ set(exported_functions
   CreateOnlineRecognizer
   CreateOnlineStream
   DecodeOnlineStream
+  DestroyOfflineStreamResultJson
   DestroyOnlineRecognizer
   DestroyOnlineRecognizerResult
   DestroyOnlineStream
+  DestroyOnlineStreamResultJson
+  GetOfflineStreamResultAsJson
   GetOnlineStreamResult
+  GetOnlineStreamResultAsJson
   InputFinished
   IsEndpoint
   IsOnlineStreamReady

wasm/asr/app-asr.js

@@ -108,7 +108,7 @@ if (navigator.mediaDevices.getUserMedia) {
       }
 
       let isEndpoint = recognizer.isEndpoint(recognizer_stream);
-      let result = recognizer.getResult(recognizer_stream);
+      let result = recognizer.getResult(recognizer_stream).text;
 
 
       if (result.length > 0 && lastResult != result) {

wasm/asr/sherpa-onnx-asr.js

@@ -661,13 +661,12 @@ class OfflineRecognizer {
   }
 
   getResult(stream) {
-    const r = this.Module._GetOfflineStreamResult(stream.handle);
+    const r = this.Module._GetOfflineStreamResultAsJson(stream.handle);
+    const jsonStr = this.Module.UTF8ToString(r);
+    const ans = JSON.parse(jsonStr);
+    this.Module._DestroyOfflineStreamResultJson(r);
 
-    const textPtr = this.Module.getValue(r, 'i8*');
-    const text = this.Module.UTF8ToString(textPtr);
-
-    this.Module._DestroyOfflineRecognizerResult(r);
-    return text;
+    return ans;
   }
 };
 
@@ -750,11 +749,13 @@ class OnlineRecognizer {
   }
 
   getResult(stream) {
-    const r = this.Module._GetOnlineStreamResult(this.handle, stream.handle);
-    const textPtr = this.Module.getValue(r, 'i8*');
-    const text = this.Module.UTF8ToString(textPtr);
-    this.Module._DestroyOnlineRecognizerResult(r);
-    return text;
+    const r =
+        this.Module._GetOnlineStreamResultAsJson(this.handle, stream.handle);
+    const jsonStr = this.Module.UTF8ToString(r);
+    const ans = JSON.parse(jsonStr);
+    this.Module._DestroyOnlineStreamResultJson(r);
+
+    return ans;
   }
 }