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-rw-r--r--dom/media/webaudio/test/blink/audio-testing.js192
1 files changed, 192 insertions, 0 deletions
diff --git a/dom/media/webaudio/test/blink/audio-testing.js b/dom/media/webaudio/test/blink/audio-testing.js
new file mode 100644
index 000000000..c66d32c7f
--- /dev/null
+++ b/dom/media/webaudio/test/blink/audio-testing.js
@@ -0,0 +1,192 @@
+if (window.testRunner)
+ testRunner.overridePreference("WebKitWebAudioEnabled", "1");
+
+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();
+}
+
+// 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 a buffer of the given length having a constant value.
+function createConstantBuffer(context, sampleFrameLength, constantValue) {
+ 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] = constantValue;
+
+ 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 start 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);
+}
+
+function shouldThrowTypeError(func, text) {
+ var ok = false;
+ try {
+ func();
+ } catch (e) {
+ if (e instanceof TypeError) {
+ ok = true;
+ }
+ }
+ if (ok) {
+ testPassed(text + " threw TypeError.");
+ } else {
+ testFailed(text + " should throw TypeError.");
+ }
+}