| <!DOCTYPE html> |
| <html> |
| <head> |
| <title> |
| Test ABSN Outputs Silence if buffer is null |
| </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> |
| const audit = Audit.createTaskRunner(); |
| |
| audit.define('ABSN with null buffer', (task, should) => { |
| // Create test context. Length and sampleRate are pretty arbitrary, but |
| // we don't need either to be very large. |
| const context = new OfflineAudioContext( |
| {numberOfChannels: 1, length: 1024, sampleRate: 8192}); |
| |
| // Just create a constant buffer for testing. Anything will do as long |
| // as the buffer contents are not identically zero. |
| const audioBuffer = |
| new AudioBuffer({length: 10, sampleRate: context.sampleRate}); |
| const audioBufferSourceNode = new AudioBufferSourceNode(context); |
| |
| audioBuffer.getChannelData(0).fill(1); |
| |
| // These two tests are mostly for the informational messages to show |
| // what's happening. They should never fail! |
| should(() => { |
| audioBufferSourceNode.buffer = audioBuffer; |
| }, 'Setting ABSN.buffer to AudioBuffer').notThrow(); |
| |
| // This is the important part. Setting the buffer to null after setting |
| // it to something else should cause the source to produce silence. |
| should(() => { |
| audioBufferSourceNode.buffer = null; |
| }, 'Setting ABSN.buffer = null').notThrow(); |
| |
| audioBufferSourceNode.start(0); |
| audioBufferSourceNode.connect(context.destination); |
| |
| context.startRendering() |
| .then(buffer => { |
| // Since the buffer is null, the output of the source should be |
| // silence. |
| should(buffer.getChannelData(0), 'ABSN output') |
| .beConstantValueOf(0); |
| }) |
| .then(() => task.done()); |
| }); |
| |
| audit.run(); |
| </script> |
| </body> |
| </html> |
