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| author | Matt A. Tobin <mattatobin@localhost.localdomain> | 2018-02-02 04:16:08 -0500 |
|---|---|---|
| committer | Matt A. Tobin <mattatobin@localhost.localdomain> | 2018-02-02 04:16:08 -0500 |
| commit | 5f8de423f190bbb79a62f804151bc24824fa32d8 (patch) | |
| tree | 10027f336435511475e392454359edea8e25895d /testing/web-platform/tests/webaudio/the-audio-api/the-audioparam-interface/retrospective-setValueAtTime.html | |
| parent | 49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff) | |
| download | UXP-5f8de423f190bbb79a62f804151bc24824fa32d8.tar UXP-5f8de423f190bbb79a62f804151bc24824fa32d8.tar.gz UXP-5f8de423f190bbb79a62f804151bc24824fa32d8.tar.lz UXP-5f8de423f190bbb79a62f804151bc24824fa32d8.tar.xz UXP-5f8de423f190bbb79a62f804151bc24824fa32d8.zip | |
Add m-esr52 at 52.6.0
Diffstat (limited to 'testing/web-platform/tests/webaudio/the-audio-api/the-audioparam-interface/retrospective-setValueAtTime.html')
| -rw-r--r-- | testing/web-platform/tests/webaudio/the-audio-api/the-audioparam-interface/retrospective-setValueAtTime.html | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/testing/web-platform/tests/webaudio/the-audio-api/the-audioparam-interface/retrospective-setValueAtTime.html b/testing/web-platform/tests/webaudio/the-audio-api/the-audioparam-interface/retrospective-setValueAtTime.html new file mode 100644 index 000000000..dde8c27b9 --- /dev/null +++ b/testing/web-platform/tests/webaudio/the-audio-api/the-audioparam-interface/retrospective-setValueAtTime.html @@ -0,0 +1,71 @@ +<!DOCTYPE html> +<title>Test setValueAtTime with startTime in the past</title> +<script src="/resources/testharness.js"></script> +<script src="/resources/testharnessreport.js"></script> +<script> +function do_test(t, context) { + var source = context.createBufferSource(); + source.buffer = + function() { + var buffer = context.createBuffer(1, 1, context.sampleRate); + buffer.getChannelData(0)[0] = 1.0; + return buffer; + }(); + source.loop = true; + source.start(); + + // Use a ramp of slope 1/sample to measure time. + // The end value is the extent of exact precision in single precision float. + const rampEnd = Math.pow(2, 24); + const rampEndSeconds = rampEnd / context.sampleRate; + var test = context.createGain(); + test.gain.setValueAtTime(0.0, 0.0); + test.gain.linearRampToValueAtTime(rampEnd, rampEndSeconds); + + // With a different starting point on the same line, the result should be + // the same. |currentTime| may include double precision floating point + // rounding errors, so round to nearest integer sample to ignore these. + var scheduledSample = Math.round(context.currentTime * context.sampleRate); + assert_equals(scheduledSample % 128, 0, + "currentTime advances in blocks of 128 samples"); + var reference = context.createGain(); + reference.gain.setValueAtTime(scheduledSample, context.currentTime); + reference.gain.linearRampToValueAtTime(rampEnd, rampEndSeconds); + + source.connect(test); + source.connect(reference); + + var merger = context.createChannelMerger(); + test.connect(merger, 0, 0); + reference.connect(merger, 0, 1); + + var processor = context.createScriptProcessor(0, 2, 0); + merger.connect(processor); + processor.onaudioprocess = + t.step_func_done((e) => { + source.stop(); + processor.onaudioprocess = null; + + var testValue = e.inputBuffer.getChannelData(0)[0]; + var referenceValue = e.inputBuffer.getChannelData(1)[0]; + + assert_equals(testValue, referenceValue, + "ramp value matches expected"); + assert_greater_than_equal(testValue, scheduledSample, + "time does not retreat"); + assert_equals(testValue % 128, 0, + "ScriptProcessor blocks align on 128-sample blocks"); + }); +} + +async_test(function(t) { + var context = new AudioContext; + (function waitForTimeAdvance() { + if (context.currentTime == 0) { + t.step_timeout(waitForTimeAdvance, 0); + } else { + do_test(t, context); + } + })(); +}); +</script> |