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+<!DOCTYPE HTML>
+<html>
+<head>
+ <title>Test StereoPannerNode</title>
+ <script 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">
+
+var SR = 44100;
+var BUF_SIZE = 128;
+var PANNING = 0.1;
+var GAIN = 0.5;
+
+// Cheap reimplementation of some bits of the spec
+function gainForPanningMonoToStereo(panning) {
+ panning += 1;
+ panning /= 2;
+ return [ Math.cos(0.5 * Math.PI * panning),
+ Math.sin(0.5 * Math.PI * panning) ];
+}
+
+function gainForPanningStereoToStereo(panning) {
+ if (panning <= 0) {
+ panning += 1.;
+ }
+ return [ Math.cos(0.5 * Math.PI * panning),
+ Math.sin(0.5 * Math.PI * panning) ];
+}
+
+function applyStereoToStereoPanning(l, r, panningValues, panning) {
+ var outL, outR;
+ if (panning <= 0) {
+ outL = l + r * panningValues[0];
+ outR = r * panningValues[1];
+ } else {
+ outL = l * panningValues[0];
+ outR = r + l * panningValues[1];
+ }
+ return [outL,outR];
+}
+
+function applyMonoToStereoPanning(c, panning) {
+ return [c * panning[0], c * panning[1]];
+}
+
+// Test the DOM interface
+var context = new OfflineAudioContext(1, 1, SR);
+var stereoPanner = new StereoPannerNode(context);
+ok(stereoPanner.pan, "The AudioParam member must exist");
+is(stereoPanner.pan.value, 0.0, "Correct initial value");
+is(stereoPanner.pan.defaultValue, 0.0, "Correct default value");
+is(stereoPanner.channelCount, 2, "StereoPannerNode node has 2 input channels by default");
+is(stereoPanner.channelCountMode, "clamped-max", "Correct channelCountMode for the StereoPannerNode");
+is(stereoPanner.channelInterpretation, "speakers", "Correct channelCountInterpretation for the StereoPannerNode");
+expectException(function() {
+ stereoPanner.channelCount = 3;
+}, DOMException.NOT_SUPPORTED_ERR);
+expectException(function() {
+ stereoPanner.channelCountMode = "max";
+}, DOMException.NOT_SUPPORTED_ERR);
+
+// A sine to be used to fill the buffers
+function sine(t) {
+ return Math.sin(440 * 2 * Math.PI * t / context.sampleRate);
+}
+
+// A couple mono and stereo buffers: the StereoPannerNode equation is different
+// if the input is mono or stereo
+var stereoBuffer = new AudioBuffer({ numberOfChannels: 2,
+ length: BUF_SIZE,
+ sampleRate: context.sampleRate });
+var monoBuffer = new AudioBuffer({ numberOfChannels: 1,
+ length: BUF_SIZE,
+ sampleRate: context.sampleRate });
+for (var i = 0; i < BUF_SIZE; ++i) {
+ monoBuffer.getChannelData(0)[i] =
+ stereoBuffer.getChannelData(0)[i] =
+ stereoBuffer.getChannelData(1)[i] = sine(i);
+}
+
+// Expected test vectors
+function expectedBufferNoop(gain) {
+ gain = gain || 1.0;
+ var expectedBuffer = new AudioBuffer({ numberOfChannels: 2,
+ length: BUF_SIZE,
+ sampleRate: SR });
+ for (var i = 0; i < BUF_SIZE; i++) {
+ expectedBuffer.getChannelData(0)[i] = gain * sine(i);
+ expectedBuffer.getChannelData(1)[i] = gain * sine(i);
+ }
+ return expectedBuffer;
+}
+
+function expectedBufferForStereo(panning, gain) {
+ gain = gain || 1.0;
+ var expectedBuffer = new AudioBuffer({ numberOfChannels: 2,
+ length: BUF_SIZE,
+ sampleRate: SR });
+ var gainPanning = gainForPanningStereoToStereo(panning);
+ for (var i = 0; i < BUF_SIZE; i++) {
+ var values = [ gain * sine(i), gain * sine(i) ];
+ var processed = applyStereoToStereoPanning(values[0], values[1], gainPanning, PANNING);
+ expectedBuffer.getChannelData(0)[i] = processed[0];
+ expectedBuffer.getChannelData(1)[i] = processed[1];
+ }
+ return expectedBuffer;
+}
+
+function expectedBufferForMono(panning, gain) {
+ gain = gain || 1.0;
+ var expectedBuffer = new AudioBuffer({ numberOfChannels: 2,
+ length: BUF_SIZE,
+ sampleRate: SR });
+ var gainPanning = gainForPanningMonoToStereo(panning);
+ gainPanning[0] *= gain;
+ gainPanning[1] *= gain;
+ for (var i = 0; i < BUF_SIZE; i++) {
+ var value = sine(i);
+ var processed = applyMonoToStereoPanning(value, gainPanning);
+ expectedBuffer.getChannelData(0)[i] = processed[0];
+ expectedBuffer.getChannelData(1)[i] = processed[1];
+ }
+ return expectedBuffer;
+}
+
+// Actual test cases
+var tests = [
+ function monoPanningNoop(ctx, panner) {
+ var monoSource = ctx.createBufferSource();
+ monoSource.connect(panner);
+ monoSource.buffer = monoBuffer;
+ monoSource.start(0);
+ return expectedBufferForMono(0);
+ },
+ function stereoPanningNoop(ctx, panner) {
+ var stereoSource = ctx.createBufferSource();
+ stereoSource.connect(panner);
+ stereoSource.buffer = stereoBuffer;
+ stereoSource.start(0);
+ return expectedBufferNoop();
+ },
+ function monoPanningNoopWithGain(ctx, panner) {
+ var monoSource = ctx.createBufferSource();
+ var gain = ctx.createGain();
+ gain.gain.value = GAIN;
+ monoSource.connect(gain);
+ gain.connect(panner);
+ monoSource.buffer = monoBuffer;
+ monoSource.start(0);
+ return expectedBufferForMono(0, GAIN);
+ },
+ function stereoPanningNoopWithGain(ctx, panner) {
+ var stereoSource = ctx.createBufferSource();
+ var gain = ctx.createGain();
+ gain.gain.value = GAIN;
+ stereoSource.connect(gain);
+ gain.connect(panner);
+ stereoSource.buffer = stereoBuffer;
+ stereoSource.start(0);
+ return expectedBufferNoop(GAIN);
+ },
+ function stereoPanningAutomation(ctx, panner) {
+ var stereoSource = ctx.createBufferSource();
+ stereoSource.connect(panner);
+ stereoSource.buffer = stereoBuffer;
+ panner.pan.setValueAtTime(0.1, 0.0);
+ stereoSource.start(0);
+ return expectedBufferForStereo(PANNING);
+ },
+ function stereoPanning(ctx, panner) {
+ var stereoSource = ctx.createBufferSource();
+ stereoSource.buffer = stereoBuffer;
+ stereoSource.connect(panner);
+ panner.pan.value = 0.1;
+ stereoSource.start(0);
+ return expectedBufferForStereo(PANNING);
+ },
+ function monoPanningAutomation(ctx, panner) {
+ var monoSource = ctx.createBufferSource();
+ monoSource.connect(panner);
+ monoSource.buffer = monoBuffer;
+ panner.pan.setValueAtTime(PANNING, 0.0);
+ monoSource.start(0);
+ return expectedBufferForMono(PANNING);
+ },
+ function monoPanning(ctx, panner) {
+ var monoSource = ctx.createBufferSource();
+ monoSource.connect(panner);
+ monoSource.buffer = monoBuffer;
+ panner.pan.value = 0.1;
+ monoSource.start(0);
+ return expectedBufferForMono(PANNING);
+ },
+ function monoPanningWithGain(ctx, panner) {
+ var monoSource = ctx.createBufferSource();
+ var gain = ctx.createGain();
+ gain.gain.value = GAIN;
+ monoSource.connect(gain);
+ gain.connect(panner);
+ monoSource.buffer = monoBuffer;
+ panner.pan.value = 0.1;
+ monoSource.start(0);
+ return expectedBufferForMono(PANNING, GAIN);
+ },
+ function stereoPanningWithGain(ctx, panner) {
+ var stereoSource = ctx.createBufferSource();
+ var gain = ctx.createGain();
+ gain.gain.value = GAIN;
+ stereoSource.connect(gain);
+ gain.connect(panner);
+ stereoSource.buffer = stereoBuffer;
+ panner.pan.value = 0.1;
+ stereoSource.start(0);
+ return expectedBufferForStereo(PANNING, GAIN);
+ },
+ function monoPanningWithGainAndAutomation(ctx, panner) {
+ var monoSource = ctx.createBufferSource();
+ var gain = ctx.createGain();
+ gain.gain.value = GAIN;
+ monoSource.connect(gain);
+ gain.connect(panner);
+ monoSource.buffer = monoBuffer;
+ panner.pan.setValueAtTime(PANNING, 0);
+ monoSource.start(0);
+ return expectedBufferForMono(PANNING, GAIN);
+ },
+ function stereoPanningWithGainAndAutomation(ctx, panner) {
+ var stereoSource = ctx.createBufferSource();
+ var gain = ctx.createGain();
+ gain.gain.value = GAIN;
+ stereoSource.connect(gain);
+ gain.connect(panner);
+ stereoSource.buffer = stereoBuffer;
+ panner.pan.setValueAtTime(PANNING, 0);
+ stereoSource.start(0);
+ return expectedBufferForStereo(PANNING, GAIN);
+ },
+ function bug_1783181(ctx, panner) {
+ const length = 128;
+ const buffer = new AudioBuffer({ length, numberOfChannels: 2, sampleRate: ctx.sampleRate });
+
+ buffer.copyToChannel(new Float32Array([1, 0.5, 0, -0.5, -1]), 0);
+ buffer.copyToChannel(new Float32Array([-0.5, -0.25, 0, 0.25, 0.5]), 1);
+
+ const audioBufferSourceNode = new AudioBufferSourceNode(ctx, { buffer });
+
+ audioBufferSourceNode.connect(panner);
+
+ panner.pan.setValueAtTime(0.5, 0);
+ panner.pan.setValueAtTime(0, 2 / ctx.sampleRate);
+ panner.pan.linearRampToValueAtTime(1, 5 / ctx.sampleRate);
+ panner.pan.cancelScheduledValues(3 / ctx.sampleRate);
+
+ audioBufferSourceNode.start(0);
+
+ const expected = new AudioBuffer({ length, numberOfChannels: 2, sampleRate: ctx.sampleRate });
+ expected.copyToChannel(new Float32Array([ 0.7071067690849304, 0.3535533845424652, 0, -0.5, -1 ]), 0);
+ expected.copyToChannel(new Float32Array([ 0.20710676908493042, 0.10355338454246521, 0, 0.25, 0.5 ]), 1);
+
+ return expected;
+ }
+];
+
+var finished = 0;
+function finish() {
+ if (++finished == tests.length) {
+ SimpleTest.finish();
+ }
+}
+
+tests.forEach(function(f) {
+ var ac = new OfflineAudioContext(2, BUF_SIZE, SR);
+ var panner = ac.createStereoPanner();
+ panner.connect(ac.destination);
+ var expected = f(ac, panner);
+ ac.oncomplete = function(e) {
+ info(f.name);
+ compareBuffers(e.renderedBuffer, expected);
+ finish();
+ };
+ ac.startRendering()
+});
+
+SimpleTest.waitForExplicitFinish();
+
+</script>
+</pre>
+<pre id=dump>
+</pre>
+</body>
+</html>
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