Convert more ScriptProcessorNode tests to testharness

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

+// 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.
+let renderLengthInFrames = 512;
+let bufferSize = 512;
+
+let context;
+
+function createBuffer(context, numberOfChannels, length) {
+  let 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;
+
+  let success = checkStereoOnlyData(buffer, inputChannels, buffer.length);
+
+  should(success, 'onaudioprocess was called with the correct input data')
+      .beTrue();
+}
+
+function fillData(buffer, numberOfChannels, length) {
+  for (let i = 0; i < numberOfChannels; ++i) {
+    let data = buffer.getChannelData(i);
+
+    for (let 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 (let i = 0; i < numberOfChannels; ++i) {
+    let data = buffer.getChannelData(i);
+
+    for (let 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);
+
+  let sourceBuffer =
+      createBuffer(context, sourceChannels, renderLengthInFrames);
+
+  let bufferSource = context.createBufferSource();
+  bufferSource.buffer = sourceBuffer;
+
+  let 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();
+}