bug 1024182 test normalization of convolution buffers via response concatenation r?dminor
MozReview-Commit-ID: AktlZvTXvWn
--- a/dom/media/webaudio/test/mochitest.ini
+++ b/dom/media/webaudio/test/mochitest.ini
@@ -107,16 +107,17 @@ skip-if = toolkit == 'android' # bug 105
[test_channelSplitterNode.html]
[test_channelSplitterNodeWithVolume.html]
skip-if = (android_version == '18' && debug) # bug 1158417
[test_convolverNode.html]
[test_convolverNode_mono_mono.html]
[test_convolverNodeChannelCount.html]
[test_convolverNodeDelay.html]
[test_convolverNodeFiniteInfluence.html]
+[test_convolverNodeNormalization.html]
[test_convolverNodePassThrough.html]
[test_convolverNodeWithGain.html]
[test_currentTime.html]
[test_decodeAudioDataOnDetachedBuffer.html]
[test_decodeAudioDataPromise.html]
[test_decodeMultichannel.html]
[test_decodeOpusTail.html]
[test_delayNode.html]
new file mode 100644
--- /dev/null
+++ b/dom/media/webaudio/test/test_convolverNodeNormalization.html
@@ -0,0 +1,83 @@
+<!DOCTYPE html>
+<title>Test normalization of convolution buffers</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+// Constants from
+// https://www.w3.org/TR/2015/WD-webaudio-20151208/#widl-ConvolverNode-normalize
+const GainCalibration = 0.00125;
+const GainCalibrationSampleRate = 44100;
+
+const sampleRate = GainCalibrationSampleRate;
+const LENGTH = 12800;
+// tolerate 16-bit math.
+const EPSILON = 1.0 / Math.pow(2, 15);
+
+function test_normalization_via_response_concat(delayIndex)
+{
+ var context = new OfflineAudioContext(1, LENGTH, sampleRate);
+
+ var impulse = context.createBuffer(1, 1, sampleRate);
+ impulse.getChannelData(0)[0] = 1.0;
+ var source = context.createBufferSource();
+ source.buffer = impulse;
+ source.start(0);
+
+ // Construct a set of adjacent responses in such a way that, when each is
+ // convolved with the impulse, they can be merged to produce a constant.
+
+ // The 5/4 ratio provides a range of lengths with different offsets within
+ // blocks.
+ var i = 0;
+ for (var responseEnd = 1;
+ i < LENGTH;
+ responseEnd = Math.floor((5 * responseEnd) / 4) + 1) {
+ var responseBuffer = context.createBuffer(1, responseEnd, sampleRate);
+ var response = responseBuffer.getChannelData(0);
+ var responseStart = i;
+ // The values in the response should be normalized, and so the output
+ // should not be dependent on the value. Pick a changing value to test
+ // this.
+ var value = responseStart + 1;
+ for (; i < responseEnd; ++i) {
+ response[i] = value;
+ }
+ var convolver = context.createConvolver();
+ convolver.normalize = true;
+ convolver.buffer = responseBuffer;
+ convolver.connect(context.destination);
+ // Undo the normalization calibration by scaling the impulse so as to
+ // expect unit pulse output from the convolver.
+ var gain = context.createGain();
+ gain.gain.value =
+ Math.sqrt((responseEnd - responseStart) / responseEnd) / GainCalibration;
+ gain.connect(convolver);
+ source.connect(gain);
+ }
+
+ return context.startRendering().
+ then((buffer) => {
+ var output = buffer.getChannelData(0);
+ var max = output[0];
+ var maxIndex = 0;
+ var min = max;
+ var minIndex = 0;
+ for (var i = 1; i < buffer.length; ++i) {
+ if (output[i] > max) {
+ max = output[i];
+ maxIndex = i;
+ } else if (output[i] < min) {
+ min = output[i];
+ minIndex = i;
+ }
+ }
+ assert_approx_equals(output[maxIndex], 1.0, EPSILON,
+ "max output at " + maxIndex);
+ assert_approx_equals(output[minIndex], 1.0, EPSILON,
+ "min output at " + minIndex);
+ });
+}
+
+promise_test(test_normalization_via_response_concat,
+ "via response concatenation");
+</script>