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Issue 2732523003:
Make ConvolverNode conform to spec (Closed)
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| 1 <!doctype html> | |
| 2 <html> | |
| 3 <head> | |
| 4 <title>Test Convolver Channel Outputs for Response with 2 channels</title> | |
| 5 <script src="../../resources/testharness.js"></script> | |
| 6 <script src="../../resources/testharnessreport.js"></script> | |
| 7 <script src="../resources/audit-util.js"></script> | |
| 8 <script src="../resources/audit.js"></script> | |
| 9 </head> | |
| 10 | |
| 11 <body> | |
| 12 <script> | |
| 13 // Test various convolver configurations when the convolver response has | |
| 14 // a stereo response. | |
| 15 // | |
|
hongchan
2017/03/28 16:44:35
Remove comment tag '//' for this line.
| |
| 16 // Fairly arbitrary sample rate, except that we want the rate to be a | |
| 17 // power of two so that 1/sampleRate is exactly respresentable as a | |
| 18 // single-precision float. | |
| 19 let sampleRate = 8192; | |
| 20 | |
| 21 // A fairly arbitrary number of frames, except the number of frames should | |
| 22 // be more than a few render quanta. | |
| 23 let renderFrames = 10 * 128; | |
| 24 | |
| 25 let audit = Audit.createTaskRunner(); | |
| 26 | |
| 27 // Convolver response | |
| 28 let response; | |
| 29 | |
| 30 audit.define( | |
| 31 { | |
| 32 label: 'initialize', | |
| 33 description: 'Convolver response with one channel' | |
| 34 }, | |
| 35 (task, should) => { | |
| 36 // Convolver response | |
| 37 should( | |
| 38 () => { | |
| 39 response = new AudioBuffer( | |
| 40 {numberOfChannels: 2, length: 4, sampleRate: sampleRate}); | |
| 41 // Each channel of the response is a simple impulse (with | |
| 42 // different delay) so that we can use a DelayNode to simulate | |
| 43 // the convolver output. Channel k is delayed by k+1 frames. | |
| 44 for (let k = 0; k < response.numberOfChannels; ++k) { | |
| 45 response.getChannelData(k)[k + 1] = 1; | |
| 46 } | |
| 47 }, | |
| 48 'new AudioBuffer({numberOfChannels: 2, length: 4, sampleRate: ' + | |
| 49 sampleRate + '})') | |
| 50 .notThrow(); | |
| 51 | |
| 52 task.done(); | |
| 53 }); | |
| 54 | |
| 55 audit.define( | |
| 56 {label: '1-channel input', description: 'produces 2-channel output'}, | |
| 57 (task, should) => { | |
| 58 stereoResponseTest({numberOfInputs: 1, prefix: '1'}, should) | |
| 59 .then(() => task.done()); | |
| 60 }); | |
| 61 | |
| 62 audit.define( | |
| 63 {label: '2-channel input', description: 'produces 2-channel output'}, | |
| 64 (task, should) => { | |
| 65 stereoResponseTest({numberOfInputes: 2, prefix: '2'}, should) | |
| 66 .then(() => task.done()); | |
| 67 }); | |
| 68 | |
| 69 audit.define( | |
| 70 { | |
| 71 label: '3-channel input', | |
| 72 description: '3->2 downmix producing 2-channel output' | |
| 73 }, | |
| 74 (task, should) => { | |
| 75 stereoResponseTest({numberOfInputs: 3, prefix: '3'}, should) | |
| 76 .then(() => task.done()); | |
| 77 }); | |
| 78 | |
| 79 audit.define( | |
| 80 { | |
| 81 label: '4-channel input', | |
| 82 description: '4->2 downmix producing 2-channel output' | |
| 83 }, | |
| 84 (task, should) => { | |
| 85 stereoResponseTest({numberOfInputs: 4, prefix: '4'}, should) | |
| 86 .then(() => task.done()); | |
| 87 }); | |
| 88 | |
| 89 audit.define( | |
| 90 { | |
| 91 label: '5.1-channel input', | |
| 92 description: '5.1->2 downmix producing 2-channel output' | |
| 93 }, | |
| 94 (task, should) => { | |
| 95 stereoResponseTest({numberOfInputs: 6, prefix: '5.1'}, should) | |
| 96 .then(() => task.done()); | |
| 97 }); | |
| 98 | |
| 99 function stereoResponseTest(options, should) { | |
| 100 // Create an 4-channel offline context. The first two channels are for | |
| 101 // the stereo output of the convolver and the next two channels are for | |
| 102 // the reference stereo signal. | |
| 103 let context = new OfflineAudioContext(4, renderFrames, sampleRate); | |
| 104 context.destination.channelInterpretation = 'discrete'; | |
| 105 | |
| 106 // Create oscillators for use as the input. The type and frequency is | |
| 107 // arbitrary except that oscillators must be different. | |
| 108 let src = new Array(options.numberOfInputs); | |
| 109 for (let k = 0; k < src.length; ++k) { | |
| 110 src[k] = new OscillatorNode( | |
| 111 context, {type: 'square', frequency: 440 + 220 * k}); | |
| 112 } | |
| 113 | |
| 114 // Merger to combine the oscillators into one output stream. | |
| 115 let srcMerger = | |
| 116 new ChannelMergerNode(context, {numberOfInputs: src.length}); | |
| 117 | |
| 118 for (let k = 0; k < src.length; ++k) { | |
| 119 src[k].connect(srcMerger, 0, k); | |
| 120 } | |
| 121 | |
| 122 // Convolver under test. | |
| 123 let conv = new ConvolverNode( | |
| 124 context, {disableNormalization: true, buffer: response}); | |
| 125 srcMerger.connect(conv); | |
| 126 | |
| 127 // Splitter to get individual channels of the convolver output so we can | |
| 128 // feed them (eventually) to the context in the right set of channels. | |
| 129 let splitter = new ChannelSplitterNode(context, {numberOfOutputs: 2}); | |
| 130 conv.connect(splitter); | |
| 131 | |
| 132 // Reference graph consists of a delays node to simulate the response of | |
| 133 // the convolver. (The convolver response is designed this way.) | |
| 134 let delay = new Array(2); | |
| 135 for (let k = 0; k < delay.length; ++k) { | |
| 136 delay[k] = new DelayNode(context, { | |
| 137 delayTime: (k + 1) / context.sampleRate, | |
| 138 channelCount: 1, | |
| 139 channelCountMode: 'explicit' | |
| 140 }); | |
| 141 } | |
| 142 | |
| 143 | |
|
hongchan
2017/03/28 16:44:34
Why two blank lines?
| |
| 144 // Gain node to mix the sources to stereo in the desired way. (Could be | |
| 145 // done in the delay node, but let's keep the mixing separated from the | |
| 146 // functionality.) | |
| 147 let gainMixer = new GainNode( | |
| 148 context, {channelCount: 2, channelCountMode: 'explicit'}); | |
| 149 srcMerger.connect(gainMixer); | |
| 150 | |
| 151 // Splitter to extract the channels of the reference signal. | |
| 152 let refSplitter = | |
| 153 new ChannelSplitterNode(context, {numberOfOutputs: 2}); | |
| 154 gainMixer.connect(refSplitter); | |
| 155 | |
| 156 // Connect each channel to the delay nodes | |
| 157 for (let k = 0; k < delay.length; ++k) { | |
| 158 refSplitter.connect(delay[k], k); | |
| 159 } | |
| 160 | |
| 161 // Final merger to bring back the individual channels from the convolver | |
| 162 // and the reference in the right order for the destination. | |
| 163 let finalMerger = new ChannelMergerNode( | |
| 164 context, {numberOfInputs: context.destination.channelCount}); | |
| 165 | |
| 166 // First two channels are for the convolver output, and the next two are | |
| 167 // for the reference. | |
| 168 splitter.connect(finalMerger, 0, 0); | |
| 169 splitter.connect(finalMerger, 1, 1); | |
| 170 delay[0].connect(finalMerger, 0, 2); | |
| 171 delay[1].connect(finalMerger, 0, 3); | |
| 172 | |
| 173 finalMerger.connect(context.destination); | |
| 174 | |
| 175 // Start the sources at last. | |
| 176 for (let k = 0; k < src.length; ++k) { | |
| 177 src[k].start(); | |
| 178 } | |
| 179 | |
| 180 return context.startRendering().then(audioBuffer => { | |
| 181 // Extract the various channels out | |
| 182 let actual0 = audioBuffer.getChannelData(0); | |
| 183 let actual1 = audioBuffer.getChannelData(1); | |
| 184 let expected0 = audioBuffer.getChannelData(2); | |
| 185 let expected1 = audioBuffer.getChannelData(3); | |
| 186 | |
| 187 // Verify that each output channel of the convolver matches | |
| 188 // the delayed signal from the reference | |
| 189 should(actual0, options.prefix + ': Channel 0') | |
| 190 .beEqualToArray(expected0); | |
| 191 should(actual1, options.prefix + ': Channel 1') | |
| 192 .beEqualToArray(expected1); | |
| 193 }); | |
| 194 } | |
| 195 | |
| 196 audit.run(); | |
| 197 </script> | |
| 198 </body> | |
| 199 </html> | |
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