| <!doctype html> |
| <html> |
| <head> |
| <title>Test Flushing of NaN to Zero in AudioParams</title> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="/webaudio/resources/audit-util.js"></script> |
| <script src="/webaudio/resources/audit.js"></script> |
| </head> |
| |
| <body> |
| <script> |
| let audit = Audit.createTaskRunner(); |
| |
| // See |
| // https://webaudio.github.io/web-audio-api/#computation-of-value. |
| // |
| // The computed value must replace NaN values in the output with |
| // the default value of the param. |
| audit.define('AudioParam NaN', async (task, should) => { |
| // For testing, we only need a small number of frames; and |
| // a low sample rate is perfectly fine. Use two channels. |
| // The first channel is for the AudioParam output. The |
| // second channel is for the AudioParam input. |
| let context = new OfflineAudioContext( |
| {numberOfChannels: 2, length: 256, sampleRate: 8192}); |
| let merger = new ChannelMergerNode( |
| context, {numberOfInputs: context.destination.channelCount}); |
| merger.connect(context.destination); |
| |
| // A constant source with a huge value. |
| let mod = new ConstantSourceNode(context, {offset: 1e30}); |
| |
| // Gain nodes with a huge positive gain and huge negative |
| // gain. Combined with the huge offset in |mod|, the |
| // output of the gain nodes are +Infinity and -Infinity. |
| let gainPos = new GainNode(context, {gain: 1e30}); |
| let gainNeg = new GainNode(context, {gain: -1e30}); |
| |
| mod.connect(gainPos); |
| mod.connect(gainNeg); |
| |
| // Connect these to the second merger channel. This is a |
| // sanity check that the AudioParam input really is NaN. |
| gainPos.connect(merger, 0, 1); |
| gainNeg.connect(merger, 0, 1); |
| |
| // Source whose AudioParam is connected to the graph |
| // that produces NaN values. Use a non-default value offset |
| // just in case something is wrong we get default for some |
| // other reason. |
| let src = new ConstantSourceNode(context, {offset: 100}); |
| |
| gainPos.connect(src.offset); |
| gainNeg.connect(src.offset); |
| |
| // AudioParam output goes to channel 1 of the destination. |
| src.connect(merger, 0, 0); |
| |
| // Let's go! |
| mod.start(); |
| src.start(); |
| |
| let buffer = await context.startRendering(); |
| |
| let input = buffer.getChannelData(1); |
| let output = buffer.getChannelData(0); |
| |
| // Have to test manually for NaN values in the input because |
| // NaN fails all comparisons. |
| let isNaN = true; |
| for (let k = 0; k < input.length; ++k) { |
| if (!Number.isNaN(input[k])) { |
| isNaN = false; |
| break; |
| } |
| } |
| |
| should(isNaN, 'AudioParam input contains only NaN').beTrue(); |
| |
| // Output of the AudioParam should have all NaN values |
| // replaced by the default. |
| should(output, 'AudioParam output') |
| .beConstantValueOf(src.offset.defaultValue); |
| |
| task.done(); |
| }); |
| |
| audit.run(); |
| </script> |
| </body> |
| </html> |
