c@73: "use strict";
c@73: 
c@97: var exampleModule = VampExamplePluginsModule();
c@73: 
c@73: // It is possible to declare both parameters and return values as
c@73: // "string", in which case Emscripten will take care of
c@73: // conversions. But it's not clear how one would manage memory for
c@73: // newly-constructed returned C strings -- the returned pointer from
c@73: // vampipeRequestJson would appear (?) to be thrown away by the
c@73: // Emscripten string converter if we declare it as returning a string,
c@73: // so we have no opportunity to pass it to vampipeFreeJson, which
c@73: // suggests this would leak memory if the string isn't static. Not
c@73: // wholly sure though. Anyway, passing and returning pointers (as
c@73: // numbers) means we can manage the Emscripten heap memory however we
c@73: // want in our request wrapper function below.
c@73: 
c@73: var vampipeRequestJson = exampleModule.cwrap(
c@73:     'vampipeRequestJson', 'number', ['number']
c@73: );
c@73: 
c@73: var vampipeFreeJson = exampleModule.cwrap(
c@73:     'vampipeFreeJson', 'void', ['number']
c@73: );
c@73: 
c@75: function note(blah) {
c@75:     document.getElementById("test-result").innerHTML += blah + "<br>";
c@75: }
c@75: 
c@75: function comment(blah) {
c@75:     note("<br><i>" + blah + "</i>");
c@75: }
c@75: 
c@73: function request(jsonStr) {
c@75:     note("Request JSON = " + jsonStr);
c@73:     var m = exampleModule;
c@73:     // Inspection reveals that intArrayFromString converts the string
c@73:     // from utf16 to utf8, which is what we want (though the docs
c@73:     // don't mention this). Note the *Cstr values are Emscripten heap
c@73:     // pointers
c@73:     var inCstr = m.allocate(m.intArrayFromString(jsonStr), 'i8', m.ALLOC_NORMAL);
c@73:     var outCstr = vampipeRequestJson(inCstr);
c@73:     m._free(inCstr);
c@73:     var result = m.Pointer_stringify(outCstr);
c@73:     vampipeFreeJson(outCstr);
c@75:     note("Returned JSON = " + result);
c@73:     return result;
c@73: }
c@73: 
c@73: function test() {
c@73: 
c@75:     comment("Querying plugin list...");
c@109:     var result = request('{"method": "list"}');
c@73: 
c@75:     comment("Loading zero crossings plugin...");
c@109:     result = request('{"method":"load","params": {"key":"vamp-example-plugins:powerspectrum","inputSampleRate":16,"adapterFlags":["AdaptAllSafe"]}}');
c@73: 
c@109:     comment("I'm now assuming that the load succeeded and the returned handle 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...");
c@109:     result = request('{"method":"configure","params":{"handle":1,"configuration":{"blockSize": 8, "channelCount": 1, "stepSize": 8}}}');
c@73: 
c@75:     comment("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.");
c@109:     result = request('{"method":"configure","params":{"handle":1,"configuration":{"blockSize": 8, "channelCount": 1, "stepSize": 8}}}');
c@73: 
c@75:     comment("Now processing a couple of blocks of data, on the same assumptions...");
c@109:     result = request('{"method":"process","params":{"handle":1,"processInput":{"timestamp":{"s":0,"n":0},"inputBuffers":[[0,1,-1,0,1,-1,0,1]]}}}');
c@109:     result = request('{"method":"process","params":{"handle":1,"processInput":{"timestamp":{"s":0,"n":500000000},"inputBuffers":[[0,1,-1,0,1,-1,0,1]]}}}');
c@73: 
c@75:     comment("Cleaning up the plugin and getting any remaining features...");
c@109:     result = request('{"method":"finish","params":{"handle":1}}');
c@73: 
c@75:     comment("A process call should now fail, as the plugin has been cleaned up.");
c@109:     result = request('{"method":"process","params":{"handle":1,"processInput":{"timestamp":{"s":0,"n":1000000000},"inputBuffers":[{"values":[0,1,-1,0,1,-1,0,1]}]}}}');
c@73: }
c@73: 
c@73: window.onload = function() {
c@73:     test();
c@73: }