Convert more ScriptProcessorNode tests to testharness

third_party/WebKit/LayoutTests/webaudio/resources/scriptprocessornode-testing-audit.js

Index: third_party/WebKit/LayoutTests/webaudio/resources/scriptprocessornode-testing-audit.js
diff --git a/third_party/WebKit/LayoutTests/webaudio/resources/scriptprocessornode-testing-audit.js b/third_party/WebKit/LayoutTests/webaudio/resources/scriptprocessornode-testing-audit.js
new file mode 100644
index 0000000000000000000000000000000000000000..cf8579641441c573986c8b8fcf0d2efe961829bb
--- /dev/null
+++ b/third_party/WebKit/LayoutTests/webaudio/resources/scriptprocessornode-testing-audit.js
@@ -0,0 +1,84 @@
+// For the current implementation of JavaScriptAudioNode, when it works with OfflineAudioContext (which runs much faster
+// than real-time) the event.inputBuffer might be overwrite again before onaudioprocess ever get chance to be called.
+// We carefully arrange the renderLengthInFrames and bufferSize to have exactly the same value to avoid this issue.
+var renderLengthInFrames = 512;
+var bufferSize = 512;
+
+var context;
+
+function createBuffer(context, numberOfChannels, length) {
+    var audioBuffer = context.createBuffer(numberOfChannels, length, sampleRate);
+
+    fillData(audioBuffer, numberOfChannels, audioBuffer.length);
+    return audioBuffer;
+}
+
+function processAudioData(event, should) {
+    buffer = event.outputBuffer;
+
+    should(buffer.numberOfChannels,
+           "Number of channels in output buffer")
+        .beEqualTo(outputChannels);
+    should(buffer.length,
+           "Length of output buffer")
+        .beEqualTo(bufferSize);
+
+    buffer = event.inputBuffer;
+
+    var success = checkStereoOnlyData(buffer, inputChannels, buffer.length);
+
+    should(success, "onaudioprocess was called with the correct input data")
+        .beTrue();
+}
+
+function fillData(buffer, numberOfChannels, length) {
+    for (var i = 0; i < numberOfChannels; ++i) {
+        var data = buffer.getChannelData(i);
+
+        for (var j = 0; j < length; ++j)
+            if (i < 2)
+                data[j] = i * 2 - 1;
+            else
+                data[j] = 0;
+    }
+}
+
+// Both 2 to 8 upmix and 8 to 2 downmix are just directly copy the first two channels and left channels are zeroed.
+function checkStereoOnlyData(buffer, numberOfChannels, length) {
+    for (var i = 0; i < numberOfChannels; ++i) {
+        var data = buffer.getChannelData(i);
+
+        for (var j = 0; j < length; ++j) {
+            if (i < 2) {
+                if (data[j] != i * 2 - 1)
+                    return false;
+            } else {
+                if (data[j] != 0)
+                    return false;
+            }
+        }
+    }
+    return true;
+}
+
+function runJSNodeTest(should)
+{
+    // Create offline audio context.
+    context = new OfflineAudioContext(2, renderLengthInFrames, sampleRate);
+
+    var sourceBuffer = createBuffer(context, sourceChannels, renderLengthInFrames);
+
+    var bufferSource = context.createBufferSource();
+    bufferSource.buffer = sourceBuffer;
+
+    var scriptNode = context.createScriptProcessor(bufferSize, inputChannels, outputChannels);
+
+    bufferSource.connect(scriptNode);
+    scriptNode.connect(context.destination);
+    scriptNode.onaudioprocess = event => {
+      processAudioData(event, should);
+    };
+
+    bufferSource.start(0);
+    return context.startRendering();
+}