Separating layout test utilities into audit-util.js

third_party/WebKit/LayoutTests/webaudio/resources/audio-testing.js

Index: third_party/WebKit/LayoutTests/webaudio/resources/audio-testing.js
diff --git a/third_party/WebKit/LayoutTests/webaudio/resources/audio-testing.js b/third_party/WebKit/LayoutTests/webaudio/resources/audio-testing.js
index d5236431d41c8cf21d553ca9687a4e5456219255..7f1b0ac4af61df3e1376a74607b733b8220fed04 100644
--- a/third_party/WebKit/LayoutTests/webaudio/resources/audio-testing.js
+++ b/third_party/WebKit/LayoutTests/webaudio/resources/audio-testing.js
@@ -45,273 +45,6 @@ var JSTEST = false;
 })();
 
 
-
-function writeString(s, a, offset) {
-    for (var i = 0; i < s.length; ++i) {
-        a[offset + i] = s.charCodeAt(i);
-    }
-}
-
-function writeInt16(n, a, offset) {
-    n = Math.floor(n);
-
-    var b1 = n & 255;
-    var b2 = (n >> 8) & 255;
-
-    a[offset + 0] = b1;
-    a[offset + 1] = b2;
-}
-
-function writeInt32(n, a, offset) {
-    n = Math.floor(n);
-    var b1 = n & 255;
-    var b2 = (n >> 8) & 255;
-    var b3 = (n >> 16) & 255;
-    var b4 = (n >> 24) & 255;
-
-    a[offset + 0] = b1;
-    a[offset + 1] = b2;
-    a[offset + 2] = b3;
-    a[offset + 3] = b4;
-}
-
-function writeAudioBuffer(audioBuffer, a, offset) {
-    var n = audioBuffer.length;
-    var channels = audioBuffer.numberOfChannels;
-
-    for (var i = 0; i < n; ++i) {
-        for (var k = 0; k < channels; ++k) {
-            var buffer = audioBuffer.getChannelData(k);
-            var sample = buffer[i] * 32768.0;
-
-            // Clip samples to the limitations of 16-bit.
-            // If we don't do this then we'll get nasty wrap-around distortion.
-            if (sample < -32768)
-                sample = -32768;
-            if (sample > 32767)
-                sample = 32767;
-
-            writeInt16(sample, a, offset);
-            offset += 2;
-        }
-    }
-}
-
-function createWaveFileData(audioBuffer) {
-    var frameLength = audioBuffer.length;
-    var numberOfChannels = audioBuffer.numberOfChannels;
-    var sampleRate = audioBuffer.sampleRate;
-    var bitsPerSample = 16;
-    var byteRate = sampleRate * numberOfChannels * bitsPerSample/8;
-    var blockAlign = numberOfChannels * bitsPerSample/8;
-    var wavDataByteLength = frameLength * numberOfChannels * 2; // 16-bit audio
-    var headerByteLength = 44;
-    var totalLength = headerByteLength + wavDataByteLength;
-
-    var waveFileData = new Uint8Array(totalLength);
-
-    var subChunk1Size = 16; // for linear PCM
-    var subChunk2Size = wavDataByteLength;
-    var chunkSize = 4 + (8 + subChunk1Size) + (8 + subChunk2Size);
-
-    writeString("RIFF", waveFileData, 0);
-    writeInt32(chunkSize, waveFileData, 4);
-    writeString("WAVE", waveFileData, 8);
-    writeString("fmt ", waveFileData, 12);
-
-    writeInt32(subChunk1Size, waveFileData, 16);      // SubChunk1Size (4)
-    writeInt16(1, waveFileData, 20);                  // AudioFormat (2)
-    writeInt16(numberOfChannels, waveFileData, 22);   // NumChannels (2)
-    writeInt32(sampleRate, waveFileData, 24);         // SampleRate (4)
-    writeInt32(byteRate, waveFileData, 28);           // ByteRate (4)
-    writeInt16(blockAlign, waveFileData, 32);         // BlockAlign (2)
-    writeInt32(bitsPerSample, waveFileData, 34);      // BitsPerSample (4)
-
-    writeString("data", waveFileData, 36);
-    writeInt32(subChunk2Size, waveFileData, 40);      // SubChunk2Size (4)
-
-    // Write actual audio data starting at offset 44.
-    writeAudioBuffer(audioBuffer, waveFileData, 44);
-
-    return waveFileData;
-}
-
-function createAudioData(audioBuffer) {
-    return createWaveFileData(audioBuffer);
-}
-
-function finishAudioTest(event) {
-    var audioData = createAudioData(event.renderedBuffer);
-    testRunner.setAudioData(audioData);
-    testRunner.notifyDone();
-}
-
-// Compare two arrays (commonly extracted from buffer.getChannelData()) with
-// constraints:
-//   options.thresholdSNR: Minimum allowed SNR between the actual and expected
-//     signal. The default value is 10000.
-//   options.thresholdDiffULP: Maximum allowed difference between the actual
-//     and expected signal in ULP(Unit in the last place). The default is 0.
-//   options.thresholdDiffCount: Maximum allowed number of sample differences
-//     which exceeds the threshold. The default is 0.
-//   options.bitDepth: The expected result is assumed to come from an audio
-//     file with this number of bits of precision. The default is 16.
-function compareBuffersWithConstraints(actual, expected, options) {
-    if (!options)
-        options = {};
-
-    if (actual.length !== expected.length)
-        testFailed('Buffer length mismatches.');
-
-    var maxError = -1;
-    var diffCount = 0;
-    var errorPosition = -1;
-    var thresholdSNR = (options.thresholdSNR || 10000);
-
-    var thresholdDiffULP = (options.thresholdDiffULP || 0);
-    var thresholdDiffCount = (options.thresholdDiffCount || 0);
-
-    // By default, the bit depth is 16.
-    var bitDepth = (options.bitDepth || 16);
-    var scaleFactor = Math.pow(2, bitDepth - 1);
-
-    var noisePower = 0, signalPower = 0;
-
-    for (var i = 0; i < actual.length; i++) {
-        var diff = actual[i] - expected[i];
-        noisePower += diff * diff;
-        signalPower += expected[i] * expected[i];
-
-        if (Math.abs(diff) > maxError) {
-            maxError = Math.abs(diff);
-            errorPosition = i;
-        }
-
-        // The reference file is a 16-bit WAV file, so we will almost never get
-        // an exact match between it and the actual floating-point result.
-        if (Math.abs(diff) > scaleFactor)
-            diffCount++;
-    }
-
-    var snr = 10 * Math.log10(signalPower / noisePower);
-    var maxErrorULP = maxError * scaleFactor;
-
-    if (snr >= thresholdSNR) {
-        testPassed('Exceeded SNR threshold of ' + thresholdSNR + ' dB.');
-    } else {
-        testFailed('Expected SNR of ' + thresholdSNR + ' dB, but actual SNR is ' +
-        snr + ' dB.');
-    }
-
-    if (maxErrorULP <= thresholdDiffULP) {
-        testPassed('Maximum difference below threshold of ' +
-            thresholdDiffULP + ' ulp (' + bitDepth + '-bits).');
-    } else {
-        testFailed('Maximum difference of ' + maxErrorULP +
-            ' at the index ' + errorPosition + ' exceeded threshold of ' +
-            thresholdDiffULP + ' ulp (' + bitDepth + '-bits).');
-    }
-
-    if (diffCount <= thresholdDiffCount) {
-        testPassed('Number of differences between results is ' +
-            diffCount + ' out of ' + actual.length + '.');
-    } else {
-        testFailed(diffCount + ' differences found but expected no more than ' +
-            diffCount + ' out of ' + actual.length + '.');
-    }
-}
-
-// Create an impulse in a buffer of length sampleFrameLength
-function createImpulseBuffer(context, sampleFrameLength) {
-    var audioBuffer = context.createBuffer(1, sampleFrameLength, context.sampleRate);
-    var n = audioBuffer.length;
-    var dataL = audioBuffer.getChannelData(0);
-
-    for (var k = 0; k < n; ++k) {
-        dataL[k] = 0;
-    }
-    dataL[0] = 1;
-
-    return audioBuffer;
-}
-
-// Create a buffer of the given length with a linear ramp having values 0 <= x < 1.
-function createLinearRampBuffer(context, sampleFrameLength) {
-    var audioBuffer = context.createBuffer(1, sampleFrameLength, context.sampleRate);
-    var n = audioBuffer.length;
-    var dataL = audioBuffer.getChannelData(0);
-
-    for (var i = 0; i < n; ++i)
-        dataL[i] = i / n;
-
-    return audioBuffer;
-}
-
-// Create an AudioBuffer of length |sampleFrameLength| having a constant value |constantValue|. If
-// |constantValue| is a number, the buffer has one channel filled with that value. If
-// |constantValue| is an array, the buffer is created wit a number of channels equal to the length
-// of the array, and channel k is filled with the k'th element of the |constantValue| array.
-function createConstantBuffer(context, sampleFrameLength, constantValue) {
-    var channels;
-    var values;
-
-    if (typeof constantValue === "number") {
-        channels = 1;
-        values = [constantValue];
-    } else {
-        channels = constantValue.length;
-        values = constantValue;
-    }
-
-    var audioBuffer = context.createBuffer(channels, sampleFrameLength, context.sampleRate);
-    var n = audioBuffer.length;
-
-    for (var c = 0; c < channels; ++c) {
-        var data = audioBuffer.getChannelData(c);
-        for (var i = 0; i < n; ++i)
-            data[i] = values[c];
-    }
-
-    return audioBuffer;
-}
-
-// Create a stereo impulse in a buffer of length sampleFrameLength
-function createStereoImpulseBuffer(context, sampleFrameLength) {
-    var audioBuffer = context.createBuffer(2, sampleFrameLength, context.sampleRate);
-    var n = audioBuffer.length;
-    var dataL = audioBuffer.getChannelData(0);
-    var dataR = audioBuffer.getChannelData(1);
-
-    for (var k = 0; k < n; ++k) {
-        dataL[k] = 0;
-        dataR[k] = 0;
-    }
-    dataL[0] = 1;
-    dataR[0] = 1;
-
-    return audioBuffer;
-}
-
-// Convert time (in seconds) to sample frames.
-function timeToSampleFrame(time, sampleRate) {
-    return Math.floor(0.5 + time * sampleRate);
-}
-
-// Compute the number of sample frames consumed by noteGrainOn with
-// the specified |grainOffset|, |duration|, and |sampleRate|.
-function grainLengthInSampleFrames(grainOffset, duration, sampleRate) {
-    var startFrame = timeToSampleFrame(grainOffset, sampleRate);
-    var endFrame = timeToSampleFrame(grainOffset + duration, sampleRate);
-
-    return endFrame - startFrame;
-}
-
-// True if the number is not an infinity or NaN
-function isValidNumber(x) {
-    return !isNaN(x) && (x != Infinity) && (x != -Infinity);
-}
-
-
 // |Audit| is a task runner for web audio test. It makes asynchronous web audio
 // testing simple and manageable.
 //