blob: 6c0793bd9c063a3fb9321ff10f8acbd9f6afaf8d [file] [log] [blame]
<!DOCTYPE html>
<html>
<head>
<script src="resources/audio-testing.js"></script>
<script src="resources/audiobuffersource-testing.js"></script>
<script src="../resources/js-test.js"></script>
</head>
<body>
<div id="description"></div>
<div id="console"></div>
<script>
description("Tests AudioBufferSourceNode start() with a variety of offsets and durations.");
// The following test cases assume an AudioBuffer of length 8 whose PCM data is a linear ramp, 0, 1, 2, 3,...
var tests = [
{ description: "start(when): implicitly play whole buffer from beginning to end",
offsetFrame: "none", durationFrames: "none", renderFrames: 16, playbackRate: 1, expected: [0,1,2,3,4,5,6,7,0,0,0,0,0,0,0,0] },
{ description: "start(when, 0): play whole buffer from beginning to end explicitly giving offset of 0",
offsetFrame: 0, durationFrames: "none", renderFrames: 16, playbackRate: 1, expected: [0,1,2,3,4,5,6,7,0,0,0,0,0,0,0,0] },
{ description: "start(when, 0, 8_frames): play whole buffer from beginning to end explicitly giving offset of 0 and duration of 8 frames",
offsetFrame: 0, durationFrames: 8, renderFrames: 16, playbackRate: 1, expected: [0,1,2,3,4,5,6,7,0,0,0,0,0,0,0,0] },
{ description: "start(when, 4_frames): play with explicit non-zero offset",
offsetFrame: 4, durationFrames: "none", renderFrames: 16, playbackRate: 1, expected: [4,5,6,7,0,0,0,0,0,0,0,0,0,0,0,0] },
{ description: "start(when, 4_frames, 4_frames): play with explicit non-zero offset and duration",
offsetFrame: 4, durationFrames: 4, renderFrames: 16, playbackRate: 1, expected: [4,5,6,7,0,0,0,0,0,0,0,0,0,0,0,0] },
// Enable test when AudioBufferSourceNode hack is fixed: https://bugs.webkit.org/show_bug.cgi?id=77224
// { description: "start(when, 3_frames, 3_frames): play a middle section with explicit offset and duration",
// offsetFrame: 3, durationFrames: 3, renderFrames: 16, playbackRate: 1, expected: [4,5,6,7,0,0,0,0,0,0,0,0,0,0,0,0] },
];
var sampleRate = 44100;
var buffer;
var bufferFrameLength = 8;
var testSpacingFrames = 32;
var testSpacingSeconds = testSpacingFrames / sampleRate;
var totalRenderLengthFrames = tests.length * testSpacingFrames;
function runLoopTest(context, testNumber, test) {
var source = context.createBufferSource();
source.buffer = buffer;
source.playbackRate.value = test.playbackRate;
source.connect(context.destination);
// Render each test one after the other, spaced apart by testSpacingSeconds.
var startTime = testNumber * testSpacingSeconds;
if (test.offsetFrame == "none" && test.durationFrames == "none") {
source.start(startTime);
} else if (test.durationFrames == "none") {
var offset = test.offsetFrame / context.sampleRate;
source.start(startTime, offset);
} else {
var offset = test.offsetFrame / context.sampleRate;
var duration = test.durationFrames / context.sampleRate;
source.start(startTime, offset, duration);
}
}
function runTest() {
window.jsTestIsAsync = true;
// Create offline audio context.
var context = new webkitOfflineAudioContext(1, totalRenderLengthFrames, sampleRate);
buffer = createTestBuffer(context, bufferFrameLength);
for (var i = 0; i < tests.length; ++i)
runLoopTest(context, i, tests[i]);
context.oncomplete = checkAllTests;
context.startRendering();
}
runTest();
</script>
</body>
</html>