| <!doctype html> |
| <meta charset=utf-8> |
| <title>Test the ConstantSourceNode Interface</title> |
| <script src=/resources/testharness.js></script> |
| <script src=/resources/testharnessreport.js></script> |
| <script> |
| test(function(t) { |
| var ac = new AudioContext(); |
| |
| var csn = ac.createConstantSource(); |
| assert_equals(csn.offset.value, 1.0, "Default offset is 1.0"); |
| |
| csn = new ConstantSourceNode(ac); |
| assert_equals(csn.offset.value, 1.0, "Default offset is 1.0"); |
| |
| csn = new ConstantSourceNode(ac, {offset: -0.25}); |
| assert_equals(csn.offset.value, -0.25, "Offset can be set during construction"); |
| }, "ConstantSourceNode can be constructed"); |
| |
| test(function(t) { |
| var ac = new AudioContext(); |
| |
| var csn = ac.createConstantSource(); |
| |
| assert_throws_dom("InvalidStateError", function() { |
| csn.stop(1); |
| }, "Start must be called before stop"); |
| |
| assert_throws_js(RangeError, function() { |
| csn.start(-1); |
| }, "When can not be negative"); |
| |
| csn.start(0); |
| assert_throws_js(RangeError, function() { |
| csn.stop(-1); |
| }, "When can not be negative"); |
| }, "ConstantSourceNode stop and start"); |
| |
| async_test(function(t) { |
| var ac = new OfflineAudioContext(1, 2048, 44100); |
| var csn = ac.createConstantSource(); |
| csn.connect(ac.destination); |
| csn.start() |
| csn.stop(1024/44100) |
| csn.onended = function(e) { |
| t.step(function() { |
| assert_equals(e.type, "ended", "Event type should be 'ended', received: " + e.type); |
| }); |
| t.done(); |
| } |
| ac.startRendering(); |
| }, "ConstantSourceNode onended event"); |
| |
| async_test(function(t) { |
| var ac = new OfflineAudioContext(1, 2048, 44100); |
| var csn = ac.createConstantSource(); |
| csn.connect(ac.destination); |
| csn.start(512/44100) |
| csn.stop(1024/44100) |
| |
| ac.oncomplete = function(e) { |
| t.step(function() { |
| var result = e.renderedBuffer.getChannelData(0); |
| for (var i = 0; i < 2048; ++i) { |
| if (i >= 512 && i < 1024) { |
| assert_equals(result[i], 1.0, "sample " + i + " should equal 1.0"); |
| } else { |
| assert_equals(result[i], 0.0, "sample " + i + " should equal 0.0"); |
| } |
| } |
| }); |
| t.done(); |
| } |
| |
| ac.startRendering(); |
| }, "ConstantSourceNode start and stop when work"); |
| |
| async_test(function(t) { |
| var ac = new OfflineAudioContext(1, 2048, 44100); |
| var csn = ac.createConstantSource(); |
| csn.offset.value = 0.25; |
| csn.connect(ac.destination); |
| csn.start() |
| |
| ac.oncomplete = function(e) { |
| t.step(function() { |
| var result = e.renderedBuffer.getChannelData(0); |
| for (var i = 0; i < 2048; ++i) { |
| assert_equals(result[i], 0.25, "sample " + i + " should equal 0.25"); |
| } |
| }); |
| t.done(); |
| } |
| |
| ac.startRendering(); |
| }, "ConstantSourceNode with no automation"); |
| |
| async_test(function(t) { |
| var ac = new OfflineAudioContext(1, 2048, 44100); |
| |
| var timeConstant = 2.0; |
| var offsetStart = 0.25; |
| var offsetEnd = 0.1; |
| |
| var csn = ac.createConstantSource(); |
| csn.offset.value = offsetStart; |
| csn.offset.setTargetAtTime(offsetEnd, 1024/ac.sampleRate, timeConstant); |
| csn.connect(ac.destination); |
| csn.start() |
| |
| ac.oncomplete = function(e) { |
| t.step(function() { |
| // create buffer with expected values |
| var buffer = ac.createBuffer(1, 2048, ac.sampleRate); |
| for (var i = 0; i < 2048; ++i) { |
| if (i < 1024) { |
| buffer.getChannelData(0)[i] = offsetStart; |
| } else { |
| time = (i-1024)/ac.sampleRate; |
| buffer.getChannelData(0)[i] = offsetEnd + (offsetStart - offsetEnd)*Math.exp(-time/timeConstant); |
| } |
| } |
| |
| var result = e.renderedBuffer.getChannelData(0); |
| var expected = buffer.getChannelData(0); |
| for (var i = 0; i < 2048; ++i) { |
| assert_true(Math.abs(result[i] - expected[i]) < 1e-6, "sample " + i + " should equal " + expected[i]); |
| } |
| }); |
| t.done(); |
| } |
| |
| ac.startRendering(); |
| }, "ConstantSourceNode with automation"); |
| </script> |
