1 files changed, 103 insertions, 0 deletions
diff --git a/dom/media/webaudio/test/test_scriptProcessorNodePassThrough.html b/dom/media/webaudio/test/test_scriptProcessorNodePassThrough.html
new file mode 100644
index 000000000..8352a331d
--- /dev/null
+++ b/dom/media/webaudio/test/test_scriptProcessorNodePassThrough.html
@@ -0,0 +1,103 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test ScriptProcessorNode with passthrough</title>
+  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="webaudio.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+// We do not use our generic graph test framework here because
+// the testing logic here is sort of complicated, and would
+// not be easy to map to OfflineAudioContext, as ScriptProcessorNodes
+// can experience delays.
+
+SimpleTest.waitForExplicitFinish();
+addLoadEvent(function() {
+  var context = new AudioContext();
+  var buffer = null;
+
+  var sourceSP = context.createScriptProcessor(2048);
+  sourceSP.addEventListener("audioprocess", function(e) {
+    // generate the audio
+    for (var i = 0; i < 2048; ++i) {
+      // Make sure our first sample won't be zero
+      e.outputBuffer.getChannelData(0)[i] = Math.sin(440 * 2 * Math.PI * (i + 1) / context.sampleRate);
+      e.outputBuffer.getChannelData(1)[i] = Math.sin(880 * 2 * Math.PI * (i + 1) / context.sampleRate);
+    }
+    // Remember our generated audio
+    buffer = e.outputBuffer;
+
+    sourceSP.removeEventListener("audioprocess", arguments.callee);
+  }, false);
+
+  function findFirstNonZeroSample(buffer) {
+    for (var i = 0; i < buffer.length; ++i) {
+      if (buffer.getChannelData(0)[i] != 0) {
+        return i;
+      }
+    }
+    return buffer.length;
+  }
+
+  var sp = context.createScriptProcessor(2048);
+  sourceSP.connect(sp);
+
+  var spWrapped = SpecialPowers.wrap(sp);
+  ok("passThrough" in spWrapped, "ScriptProcessorNode should support the passThrough API");
+  spWrapped.passThrough = true;
+
+  sp.onaudioprocess = function() {
+    ok(false, "The audioprocess event must never be dispatched on the passthrough ScriptProcessorNode");
+  };
+
+  var sp2 = context.createScriptProcessor(2048);
+  sp.connect(sp2);
+  sp2.connect(context.destination);
+
+  var emptyBuffer = context.createBuffer(1, 2048, context.sampleRate);
+
+  sp2.onaudioprocess = function(e) {
+    // Because of the initial latency added by the second script processor node,
+    // we will never see any generated audio frames in the first callback.
+    compareChannels(e.inputBuffer.getChannelData(0), emptyBuffer.getChannelData(0));
+    compareChannels(e.inputBuffer.getChannelData(1), emptyBuffer.getChannelData(0));
+
+    sp2.onaudioprocess = function(e) {
+      var firstNonZero = findFirstNonZeroSample(e.inputBuffer);
+      ok(firstNonZero <= 2048, "First non-zero sample within range");
+
+      compareChannels(e.inputBuffer.getChannelData(0), emptyBuffer.getChannelData(0), firstNonZero);
+      compareChannels(e.inputBuffer.getChannelData(1), emptyBuffer.getChannelData(0), firstNonZero);
+      compareChannels(e.inputBuffer.getChannelData(0), buffer.getChannelData(0), 2048 - firstNonZero, firstNonZero, 0);
+      compareChannels(e.inputBuffer.getChannelData(1), buffer.getChannelData(1), 2048 - firstNonZero, firstNonZero, 0);
+
+      if (firstNonZero == 0) {
+        // If we did not experience any delays, the test is done!
+        sp2.onaudioprocess = null;
+
+        SimpleTest.finish();
+      } else if (firstNonZero != 2048) {
+        // In case we just saw a zero buffer this time, wait one more round
+        sp2.onaudioprocess = function(e) {
+          compareChannels(e.inputBuffer.getChannelData(0), buffer.getChannelData(0), firstNonZero, 0, 2048 - firstNonZero);
+          compareChannels(e.inputBuffer.getChannelData(1), buffer.getChannelData(1), firstNonZero, 0, 2048 - firstNonZero);
+          compareChannels(e.inputBuffer.getChannelData(0), emptyBuffer.getChannelData(0), undefined, firstNonZero);
+          compareChannels(e.inputBuffer.getChannelData(1), emptyBuffer.getChannelData(0), undefined, firstNonZero);
+
+          sp2.onaudioprocess = null;
+
+          SimpleTest.finish();
+        };
+      }
+    };
+  };
+});
+
+</script>
+</pre>
+</body>
+</html>