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<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 looping with a variety of loop points.");

// The following test cases assume an AudioBuffer of length 8 whose PCM data is a linear ramp, 0, 1, 2, 3,...

var tests = [

{ description: "loop whole buffer by default with loopStart == loopEnd == 0",
  loopStartFrame: 0, loopEndFrame: 0, renderFrames: 16, playbackRate: 1, expected: [0,1,2,3,4,5,6,7,0,1,2,3,4,5,6,7] },

{ description: "loop whole buffer explicitly",
  loopStartFrame: 0, loopEndFrame: 8, renderFrames: 16, playbackRate: 1, expected: [0,1,2,3,4,5,6,7,0,1,2,3,4,5,6,7] },

{ description: "loop from middle to end of buffer",
  loopStartFrame: 4, loopEndFrame: 8, renderFrames: 16, playbackRate: 1, expected: [0,1,2,3,4,5,6,7,4,5,6,7,4,5,6,7] },

{ description: "loop from start to middle of buffer",
  loopStartFrame: 0, loopEndFrame: 4, renderFrames: 16, playbackRate: 1, expected: [0,1,2,3,0,1,2,3,0,1,2,3,0,1,2,3] },

{ description: "loop internally from 4 -> 6",
  loopStartFrame: 4, loopEndFrame: 6, renderFrames: 16, playbackRate: 1, expected: [0,1,2,3,4,5,4,5,4,5,4,5,4,5,4,5] },

{ description: "loop internally from 3 -> 7",
  loopStartFrame: 3, loopEndFrame: 7, renderFrames: 16, playbackRate: 1, expected: [0,1,2,3,4,5,6,3,4,5,6,3,4,5,6,3] },

{ description: "loop internally from 4 -> 6 with playbackRate of 0.5",
  loopStartFrame: 4, loopEndFrame: 6, renderFrames: 16, playbackRate: 0.5, expected: [0, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 4, 4.5, 5, 5.5] },

{ description: "loop internally from 4 -> 6 with playbackRate of 1.5",
  loopStartFrame: 4, loopEndFrame: 6, renderFrames: 16, playbackRate: 1.5, expected: [0, 1.5, 3, 4.5, 4, 5.5, 5, 4.5, 4, 5.5, 5, 4.5, 4, 5.5, 5, 4.5] },

{ description: "illegal playbackRate of 47 greater than loop length",
  loopStartFrame: 4, loopEndFrame: 6, renderFrames: 16, playbackRate: 47, expected: [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0] },

// Try illegal loop-points - they should be ignored and we'll loop the whole buffer.

{ description: "illegal loop: loopStartFrame > loopEndFrame",
  loopStartFrame: 7, loopEndFrame: 3, renderFrames: 16, playbackRate: 1, expected: [0,1,2,3,4,5,6,7,0,1,2,3,4,5,6,7] },

{ description: "illegal loop: loopStartFrame == loopEndFrame",
  loopStartFrame: 3, loopEndFrame: 3, renderFrames: 16, playbackRate: 1, expected: [0,1,2,3,4,5,6,7,0,1,2,3,4,5,6,7] },

{ description: "illegal loop: loopStartFrame < 0",
  loopStartFrame: -45, loopEndFrame: 3, renderFrames: 16, playbackRate: 1, expected: [0,1,2,3,4,5,6,7,0,1,2,3,4,5,6,7] },

{ description: "illegal loop: loopEndFrame > bufferLength",
  loopStartFrame: 0, loopEndFrame: 30000, renderFrames: 16, playbackRate: 1, expected: [0,1,2,3,4,5,6,7,0,1,2,3,4,5,6,7] },

];

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.loop = true;
    source.loopStart = test.loopStartFrame / context.sampleRate;
    source.loopEnd = test.loopEndFrame / context.sampleRate;

    source.connect(context.destination);

    // Render each test one after the other, spaced apart by testSpacingSeconds.
    var startTime = testNumber * testSpacingSeconds;
    var duration = test.renderFrames / context.sampleRate;
    source.start(startTime);
    source.stop(startTime + 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>
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