comparison quick-test.js @ 4:3a5a6535d50d

Simple test script (and associated fixes) for the JS code

+"use strict";
+
+var exampleModule = ExampleModule();
+
+// It is possible to declare both parameters and return values as
+// "string", in which case Emscripten will take care of
+// conversions. But it's not clear how one would manage memory for
+// newly-constructed returned C strings -- the returned pointer from
+// vampipeRequestJson would appear (?) to be thrown away by the
+// Emscripten string converter if we declare it as returning a string,
+// so we have no opportunity to pass it to vampipeFreeJson, which
+// suggests this would leak memory if the string isn't static. Not
+// wholly sure though. Anyway, passing and returning pointers (as
+// numbers) means we can manage the Emscripten heap memory however we
+// want in our request wrapper function below.
+
+var vampipeRequestJson = exampleModule.cwrap(
+    'vampipeRequestJson', 'number', ['number']
+);
+
+var vampipeFreeJson = exampleModule.cwrap(
+    'vampipeFreeJson', 'void', ['number']
+);
+
+function request(jsonStr) {
+    var m = exampleModule;
+    // Inspection reveals that intArrayFromString converts the string
+    // from utf16 to utf8, which is what we want (though the docs
+    // don't mention this). Note the *Cstr values are Emscripten heap
+    // pointers
+    var inCstr = m.allocate(m.intArrayFromString(jsonStr), 'i8', m.ALLOC_NORMAL);
+    var outCstr = vampipeRequestJson(inCstr);
+    m._free(inCstr);
+    var result = m.Pointer_stringify(outCstr);
+    vampipeFreeJson(outCstr);
+    return result;
+}
+
+function note(blah) {
+    document.getElementById("test-result").innerHTML += blah + "<br>";
+}
+
+function test() {
+
+    note("Querying plugin list...");
+    var result = request('{"type": "list"}');
+    note("Result JSON = " + result);
+
+    note("<br>Loading zero crossings plugin...");
+    result = request('{"type":"load","content": {"pluginKey":"vamp-example-plugins:zerocrossing","inputSampleRate":16,"adapterFlags":["AdaptAllSafe"]}}');
+    note("Result JSON = " + result);
+
+    note("<br>I'm now assuming that the load succeeded and the returned pluginHandle was 1. I haven't bothered to parse the JSON. If those assumptions are wrong, this obviously isn't going to work. Configuring the plugin...");
+    result = request('{"type":"configure","content":{"pluginHandle":1,"configuration":{"blockSize": 8, "channelCount": 1, "stepSize": 8}}}');
+    note("Result JSON = " + result);
+
+    note("<br>If I try to configure it again, it should fail because it's already configured... but this doesn't change anything, and subsequent processing should work fine. Just an example of a failure call. NB this only works if Emscripten has exception catching enabled -- it's off by default in opt builds, which would just end the script here. Wonder what the performance penalty is like.");
+    result = request('{"type":"configure","content":{"pluginHandle":1,"configuration":{"blockSize": 8, "channelCount": 1, "stepSize": 8}}}');
+    note("Result JSON = " + result);
+
+    note("<br>Now processing a couple of blocks of data, on the same assumptions...");
+    result = request('{"type":"process","content":{"pluginHandle":1,"processInput":{"timestamp":{"s":0,"n":0},"inputBuffers":[{"values":[0,1,-1,0,1,-1,0,1]}]}}}');
+    note("Result JSON = " + result);
+    result = request('{"type":"process","content":{"pluginHandle":1,"processInput":{"timestamp":{"s":0,"n":500000000},"inputBuffers":[{"values":[0,1,-1,0,1,-1,0,1]}]}}}');
+    note("Result JSON = " + result);
+
+    note("<br>Cleaning up the plugin and getting any remaining features...");
+    result = request('{"type":"finish","content":{"pluginHandle":1}}');
+    note("Result JSON = " + result);
+
+    note("<br>A process call should now fail, as the plugin has been cleaned up.");
+    result = request('{"type":"process","content":{"pluginHandle":1,"processInput":{"timestamp":{"s":0,"n":1000000000},"inputBuffers":[{"values":[0,1,-1,0,1,-1,0,1]}]}}}');
+    note("Result JSON = " + result);
+}
+
+window.onload = function() {
+    test();
+}