The Tor Browser: content/media/webaudio/test/test_scriptProcessorNode.html@b8a032363ba2 (annotated)

content/media/webaudio/test/test_scriptProcessorNode.html@b8a032363ba2 (annotated)

content/media/webaudio/test/test_scriptProcessorNode.html

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 <!DOCTYPE HTML>
 <html>
 <head>
   <title>Test ScriptProcessorNode</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(0)[i] = Math.sin(880 * 2 * Math.PI * (i + 1) / context.sampleRate);
     }
     // Remember our generated audio
     buffer = e.outputBuffer;
     sourceSP.removeEventListener("audioprocess", arguments.callee);
   }, false);
   expectException(function() {
     context.createScriptProcessor(1);
   }, DOMException.INDEX_SIZE_ERR);
   expectException(function() {
     context.createScriptProcessor(2);
   }, DOMException.INDEX_SIZE_ERR);
   expectException(function() {
     context.createScriptProcessor(128);
   }, DOMException.INDEX_SIZE_ERR);
   expectException(function() {
     context.createScriptProcessor(255);
   }, DOMException.INDEX_SIZE_ERR);
   is(sourceSP.channelCount, 2, "script processor node has 2 input channels by default");
   is(sourceSP.channelCountMode, "explicit", "Correct channelCountMode for the script processor node");
   is(sourceSP.channelInterpretation, "speakers", "Correct channelCountInterpretation for the script processor node");
   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);
   sp.connect(context.destination);
   var lastPlaybackTime = 0;
   sp.onaudioprocess = function(e) {
     isnot(buffer, null, "The audioprocess handler for sourceSP must be run at this point");
     is(e.target, sp, "Correct event target");
     ok(e.playbackTime > lastPlaybackTime, "playbackTime correctly set");
     lastPlaybackTime = e.playbackTime;
     is(e.inputBuffer.numberOfChannels, 2, "Correct number of channels for the input buffer");
     is(e.inputBuffer.length, 2048, "Correct length for the input buffer");
     is(e.inputBuffer.sampleRate, context.sampleRate, "Correct sample rate for the input buffer");
     is(e.outputBuffer.numberOfChannels, 2, "Correct number of channels for the output buffer");
     is(e.outputBuffer.length, 2048, "Correct length for the output buffer");
     is(e.outputBuffer.sampleRate, context.sampleRate, "Correct sample rate for the output buffer");
     // Because of the initial latency added by the second script processor node,
     // we will never see any generated audio frames in the first callback.
     var emptyBuffer = context.createBuffer(1, 2048, context.sampleRate);
     compareChannels(e.inputBuffer.getChannelData(0), emptyBuffer.getChannelData(0));
     compareChannels(e.inputBuffer.getChannelData(1), emptyBuffer.getChannelData(0));
     compareChannels(e.outputBuffer.getChannelData(0), emptyBuffer.getChannelData(0));
     compareChannels(e.outputBuffer.getChannelData(1), emptyBuffer.getChannelData(0));
     sp.onaudioprocess = function(e) {
       is(e.target, sp, "Correct event target");
       ok(e.playbackTime > lastPlaybackTime, "playbackTime correctly set");
       lastPlaybackTime = e.playbackTime;
       is(e.inputBuffer.numberOfChannels, 2, "Correct number of channels for the input buffer");
       is(e.inputBuffer.length, 2048, "Correct length for the input buffer");
       is(e.inputBuffer.sampleRate, context.sampleRate, "Correct sample rate for the input buffer");
       is(e.outputBuffer.numberOfChannels, 2, "Correct number of channels for the output buffer");
       is(e.outputBuffer.length, 2048, "Correct length for the output buffer");
       is(e.outputBuffer.sampleRate, context.sampleRate, "Correct sample rate for the output buffer");
       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);
       compareChannels(e.outputBuffer.getChannelData(0), emptyBuffer.getChannelData(0));
       compareChannels(e.outputBuffer.getChannelData(1), emptyBuffer.getChannelData(0));
       if (firstNonZero == 0) {
         // If we did not experience any delays, the test is done!
         sp.onaudioprocess = null;
         SimpleTest.finish();
       } else if (firstNonZero != 2048) {
         // In case we just saw a zero buffer this time, wait one more round
         sp.onaudioprocess = function(e) {
           is(e.target, sp, "Correct event target");
           ok(e.playbackTime > lastPlaybackTime, "playbackTime correctly set");
           lastPlaybackTime = e.playbackTime;
           is(e.inputBuffer.numberOfChannels, 2, "Correct number of channels for the input buffer");
           is(e.inputBuffer.length, 2048, "Correct length for the input buffer");
           is(e.inputBuffer.sampleRate, context.sampleRate, "Correct sample rate for the input buffer");
           is(e.outputBuffer.numberOfChannels, 2, "Correct number of channels for the output buffer");
           is(e.outputBuffer.length, 2048, "Correct length for the output buffer");
           is(e.outputBuffer.sampleRate, context.sampleRate, "Correct sample rate for the output buffer");
           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);
           compareChannels(e.outputBuffer.getChannelData(0), emptyBuffer.getChannelData(0));
           compareChannels(e.outputBuffer.getChannelData(1), emptyBuffer.getChannelData(0));
           sp.onaudioprocess = null;
           SimpleTest.finish();
         };
       }
     };
   };
 });
 </script>
 </pre>
 </body>
 </html>

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content/media/webaudio/test/test_scriptProcessorNode.html@b8a032363ba2 (annotated)

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