third_party/WebKit/LayoutTests/webaudio/audiochannelmerger-input-non-default.html

   1 <!DOCTYPE html>
   2 <html>
   3
   4 <head>
   5   <script src="../resources/js-test.js"></script>
   6   <script src="resources/compatibility.js"></script>
   7   <script src="resources/audio-testing.js"></script>
   8   <script src="resources/merger-testing.js"></script>
   9 </head>
  10
  11 <body>
  12   <script>
  13     description('Test input handling of ChannelMergerNode (non-default).');
  14     window.jsTestIsAsync = true;
  15
  16     var audit = Audit.createTaskRunner();
  17
  18
  19     // Task: Check if an inactive input renders a silent mono channel in the
  20     // output.
  21     audit.defineTask('silent-channel', function (done) {
  22       testMergerInput({
  23         numberOfChannels: 7,
  24
  25         // Create a mono source buffer filled with '1'.
  26         testBufferChannelCount: 1,
  27
  28         // Connect the output of source into the 7th input of merger.
  29         mergerInputIndex: 6,
  30
  31         // 7th channel should be '1'.
  32         expected: [0, 0, 0, 0, 0, 0, 1],
  33       }, done);
  34     });
  35
  36
  37     // Task: Check if a stereo input is being down-mixed to mono channel
  38     // correctly based on the mixing rule.
  39     audit.defineTask('stereo-down-mixing', function (done) {
  40       testMergerInput({
  41         numberOfChannels: 7,
  42
  43         // Create a stereo buffer filled with '1' and '2' for left and right
  44         // channels respectively.
  45         testBufferChannelCount: 2,
  46
  47         // Connect the output of source into the 7th input of merger.
  48         mergerInputIndex: 6,
  49
  50         // The result of summed and down-mixed stereo audio should be 1.5.
  51         // (= 1 * 0.5 + 2 * 0.5)
  52         expected: [0, 0, 0, 0, 0, 0, 1.5],
  53       }, done);
  54     });
  55
  56
  57     // Task: Check if 3-channel input gets processed by the 'discrete' mixing
  58     // rule.
  59     audit.defineTask('undefined-channel-layout', function (done) {
  60       testMergerInput({
  61         numberOfChannels: 7,
  62
  63         // Create a 3-channel buffer filled with '1', '2', and '3' respectively.
  64         testBufferChannelCount: 3,
  65
  66         // Connect the output of source into the 7th input of merger.
  67         mergerInputIndex: 6,
  68
  69         // The result of summed stereo audio should be 1 because 3-channel is
  70         // not a canonical layout, so the input channel 2 and 3 should be
  71         // dropped by 'discrete' mixing rule.
  72         expected: [0, 0, 0, 0, 0, 0, 1],
  73       }, done);
  74     });
  75
  76     audit.defineTask('finish', function (done) {
  77       finishJSTest();
  78       done();
  79     });
  80
  81     audit.runTasks(
  82       'silent-channel',
  83       'stereo-down-mixing',
  84       'undefined-channel-layout',
  85       'finish'
  86     );
  87
  88     successfullyParsed = true;
  89   </script>
  90 </body>
  91
  92 </html>