| <!doctype html> |
| <html> |
| <head> |
| <title> |
| Test ConverNode Does Not Modify its Buffer |
| </title> |
| <script src="../../imported/w3c/web-platform-tests/resources/testharness.js"></script> |
| <script src="../../resources/testharnessreport.js"></script> |
| <script src="../resources/audit-util.js"></script> |
| <script src="../resources/audit.js"></script> |
| </head> |
| |
| <body> |
| <script> |
| // Arbitrary sample rate |
| let sampleRate = 48000; |
| |
| // We're not going to render anything from the offline context, so make it |
| // short. |
| let renderFrames = RENDER_QUANTUM_FRAMES; |
| |
| let audit = Audit.createTaskRunner(); |
| |
| audit.define( |
| {label: 'test', description: 'Convolver buffer is unchanged'}, |
| (task, should) => { |
| let context = new OfflineAudioContext( |
| {length: renderFrames, sampleRate: sampleRate}); |
| |
| // Let the impulse response be a sine wave with a frequency of |
| // 1234.5678 Hz. No particular reason for this frequency except |
| // that we know this will cause the convolver to modify its |
| // response if it hasn't been fixed not to do that. |
| let responseData = new Float32Array(500); |
| let omega = 2 * Math.PI / sampleRate * 1234.5678; |
| for (let k = 0; k < responseData.length; ++k) { |
| responseData[k] = Math.sin(omega * k); |
| } |
| |
| let response = new AudioBuffer( |
| {length: responseData.length, sampleRate: context.sampleRate}); |
| |
| response.copyToChannel(responseData, 0); |
| |
| // Create the convolver node with the desired response buffer. |
| // Explicitly enable normalization. |
| let node = new ConvolverNode( |
| context, {buffer: response, disableNormalizations: false}); |
| |
| let output = response.getChannelData(0); |
| |
| // After constructing the ConvolverNode, the response better had |
| // better be unmodified. |
| should(output, 'Convolver response after construction') |
| .beCloseToArray(responseData, {absoluteThreshold: 0}); |
| |
| task.done(); |
| }); |
| |
| audit.run(); |
| </script> |
| </body> |
| </html> |
