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Diffstat (limited to 'testing/web-platform/tests/webaudio/the-audio-api/the-scriptprocessornode-interface/simple-input-output.html')
-rw-r--r-- | testing/web-platform/tests/webaudio/the-audio-api/the-scriptprocessornode-interface/simple-input-output.html | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/testing/web-platform/tests/webaudio/the-audio-api/the-scriptprocessornode-interface/simple-input-output.html b/testing/web-platform/tests/webaudio/the-audio-api/the-scriptprocessornode-interface/simple-input-output.html new file mode 100644 index 0000000000..7fd20e67a7 --- /dev/null +++ b/testing/web-platform/tests/webaudio/the-audio-api/the-scriptprocessornode-interface/simple-input-output.html @@ -0,0 +1,98 @@ +<!doctype html> +<html> + <head> + <title>Test ScriptProcessorNode</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> + // Arbitrary sample rate + const sampleRate = 48000; + let audit = Audit.createTaskRunner(); + + audit.define( + { + label: 'test', + description: 'ScriptProcessor with stopped input source' + }, + (task, should) => { + // Two channels for testing. Channel 0 is the output of the + // scriptProcessor. Channel 1 is the oscillator so we can compare + // the outputs. + let context = new OfflineAudioContext({ + numberOfChannels: 2, + length: sampleRate, + sampleRate: sampleRate + }); + + let merger = new ChannelMergerNode( + context, {numberOfChannels: context.destination.channelCount}); + merger.connect(context.destination); + + let src = new OscillatorNode(context); + + // Arbitrary buffer size for the ScriptProcessorNode. Don't use 0; + // we need to know the actual size to know the latency of the node + // (easily). + const spnSize = 512; + let spn = context.createScriptProcessor(spnSize, 1, 1); + + // Arrange for the ScriptProcessor to add |offset| to the input. + const offset = 1; + spn.onaudioprocess = (event) => { + let input = event.inputBuffer.getChannelData(0); + let output = event.outputBuffer.getChannelData(0); + for (let k = 0; k < output.length; ++k) { + output[k] = input[k] + offset; + } + }; + + src.connect(spn).connect(merger, 0, 0); + src.connect(merger, 0, 1); + + // Start and stop the source. The stop time is fairly arbitrary, + // but use a render quantum boundary for simplicity. + const stopFrame = RENDER_QUANTUM_FRAMES; + src.start(0); + src.stop(stopFrame / context.sampleRate); + + context.startRendering() + .then(buffer => { + let ch0 = buffer.getChannelData(0); + let ch1 = buffer.getChannelData(1); + + let shifted = ch1.slice(0, stopFrame).map(x => x + offset); + + // SPN has a basic latency of 2*|spnSize| fraems, so the + // beginning is silent. + should( + ch0.slice(0, 2 * spnSize - 1), + `ScriptProcessor output[0:${2 * spnSize - 1}]`) + .beConstantValueOf(0); + + // For the middle section (after adding latency), the output + // should be the source shifted by |offset|. + should( + ch0.slice(2 * spnSize, 2 * spnSize + stopFrame), + `ScriptProcessor output[${2 * spnSize}:${ + 2 * spnSize + stopFrame - 1}]`) + .beCloseToArray(shifted, {absoluteThreshold: 0}); + + // Output should be constant after the source has stopped. + // Include the latency introduced by the node. + should( + ch0.slice(2 * spnSize + stopFrame), + `ScriptProcessor output[${2 * spnSize + stopFrame}:]`) + .beConstantValueOf(offset); + }) + .then(() => task.done()); + }); + + audit.run(); + </script> + </body> +</html> |