Source code
Revision control
Copy as Markdown
Other Tools
if (typeof(window) == "undefined") {
benchmarks = []
registerTestFile = function() {}
registerTestCase = function(o) { return benchmarks.push(o.name); }
}
registerTestFile({ sampleRate: 48000, url: "think-mono-48000.wav" });
registerTestFile({ sampleRate: 44100, url: "think-mono-44100.wav" });
registerTestFile({ sampleRate: 38000, url: "think-mono-38000.wav" });
registerTestFile({ sampleRate: 48000, url: "think-stereo-48000.wav" });
registerTestFile({ sampleRate: 44100, url: "think-stereo-44100.wav" });
registerTestFile({ sampleRate: 38000, url: "think-stereo-38000.wav" });
registerTestCase({
func: function () {
var oac = new OfflineAudioContext(1, DURATION * sampleRate, sampleRate);
return oac;
},
name: "Empty testcase"
});
registerTestCase({
func: function () {
var oac = new OfflineAudioContext(1, DURATION * sampleRate, sampleRate);
var source0 = oac.createBufferSource();
source0.buffer = getSpecificFile({ sampleRate: oac.sampleRate, numberOfChannels: 1 });
source0.loop = true;
source0.connect(oac.destination);
source0.start(0);
return oac;
},
name: "Simple source test without resampling"
});
registerTestCase({
func: function() {
var oac = new OfflineAudioContext(2, DURATION * sampleRate, sampleRate);
var source0 = oac.createBufferSource();
source0.buffer = getSpecificFile({ sampleRate: oac.sampleRate, numberOfChannels: 2 });
source0.loop = true;
source0.connect(oac.destination);
source0.start(0);
return oac;
},
name: "Simple source test without resampling (Stereo)"
});
registerTestCase({
func: function () {
var oac = new OfflineAudioContext(2, DURATION * sampleRate, sampleRate);
var source0 = oac.createBufferSource();
var panner = oac.createPanner();
source0.buffer = getSpecificFile({ sampleRate: oac.sampleRate, numberOfChannels: 2 });
source0.loop = true;
panner.setPosition(1, 2, 3);
panner.setOrientation(10, 10, 10);
source0.connect(panner);
panner.connect(oac.destination);
source0.start(0);
return oac;
},
name: "Simple source test without resampling (Stereo and positional)"
});
registerTestCase({
func: function() {
var oac = new OfflineAudioContext(1, DURATION * sampleRate, sampleRate);
var source0 = oac.createBufferSource();
source0.buffer = getSpecificFile({ sampleRate: 38000, numberOfChannels: 1 });
source0.loop = true;
source0.connect(oac.destination);
source0.start(0);
return oac;
},
name: "Simple source test with resampling (Mono)"
});
registerTestCase({
func: function() {
var oac = new OfflineAudioContext(2, DURATION * sampleRate, sampleRate);
var source0 = oac.createBufferSource();
source0.buffer = getSpecificFile({ sampleRate: 38000, numberOfChannels: 2 });
source0.loop = true;
source0.connect(oac.destination);
source0.start(0);
return oac;
},
name: "Simple source test with resampling (Stereo)"
});
registerTestCase({
func: function() {
var oac = new OfflineAudioContext(2, DURATION * sampleRate, sampleRate);
var source0 = oac.createBufferSource();
var panner = oac.createPanner();
source0.buffer = getSpecificFile({ sampleRate: 38000, numberOfChannels: 2 });
source0.loop = true;
panner.setPosition(1, 2, 3);
panner.setOrientation(10, 10, 10);
source0.connect(panner);
panner.connect(oac.destination);
source0.start(0);
return oac;
},
name: "Simple source test with resampling (Stereo and positional)"
});
registerTestCase({
func: function() {
var oac = new OfflineAudioContext(2, DURATION * sampleRate, sampleRate);
var source0 = oac.createBufferSource();
source0.buffer = getSpecificFile({ sampleRate: oac.sampleRate, numberOfChannels: 1 });
source0.loop = true;
source0.connect(oac.destination);
source0.start(0);
return oac;
},
name: "Upmix without resampling (Mono -> Stereo)"
});
registerTestCase({
func: function() {
var oac = new OfflineAudioContext(1, DURATION * sampleRate, sampleRate);
var source0 = oac.createBufferSource();
source0.buffer = getSpecificFile({ sampleRate: oac.sampleRate, numberOfChannels: 2 });
source0.loop = true;
source0.connect(oac.destination);
source0.start(0);
return oac;
},
name: "Downmix without resampling (Stereo -> Mono)"
});
registerTestCase({
func: function() {
var duration_adjusted = DURATION / 4;
var oac = new OfflineAudioContext(2, duration_adjusted * sampleRate, sampleRate);
for (var i = 0; i < 100; i++) {
var source0 = oac.createBufferSource();
source0.buffer = getSpecificFile({ sampleRate: 38000, numberOfChannels: 1 });
source0.loop = true;
source0.connect(oac.destination);
source0.start(0);
}
return oac;
},
name: "Simple mixing (100x same buffer)"
});
registerTestCase({
func: function() {
var duration_adjusted = DURATION / 4;
var oac = new OfflineAudioContext(2, duration_adjusted * sampleRate, sampleRate);
var reference = getSpecificFile({ sampleRate: 38000, numberOfChannels: 1 }).getChannelData(0);
for (var i = 0; i < 100; i++) {
var source0 = oac.createBufferSource();
// copy the buffer into the a new one, so we know the implementation is not
// sharing them.
var b = oac.createBuffer(1, reference.length, 38000);
var data = b.getChannelData(0);
for (var j = 0; j < b.length; j++) {
data[i] = reference[i];
}
source0.buffer = b;
source0.loop = true;
source0.connect(oac.destination);
source0.start(0);
}
return oac;
},
name: "Simple mixing (100 different buffers)"
});
registerTestCase({
func: function() {
var oac = new OfflineAudioContext(2, DURATION * sampleRate, sampleRate);
var gain = oac.createGain();
gain.gain.value = -1;
gain.connect(oac.destination);
var gainsi = [];
for (var i = 0; i < 4; i++) {
var gaini = oac.createGain();
gaini.gain.value = 0.25;
gaini.connect(gain);
gainsi[i] = gaini
}
for (var j = 0; j < 2; j++) {
var sourcej = oac.createBufferSource();
sourcej.buffer = getSpecificFile({ sampleRate: 38000, numberOfChannels: 1 });
sourcej.loop = true;
sourcej.start(0);
for (var i = 0; i < 4; i++) {
var gainij = oac.createGain();
gainij.gain.value = 0.5;
gainij.connect(gainsi[i]);
sourcej.connect(gainij);
}
}
return oac;
},
name: "Simple mixing with gains"
});
registerTestCase({
func: function() {
var duration_adjusted = DURATION / 8;
var oac = new OfflineAudioContext(1, duration_adjusted * sampleRate, sampleRate);
var i,l;
var decay = 10;
var duration = 4;
var len = sampleRate * duration;
var buffer = ac.createBuffer(2, len, oac.sampleRate)
var iL = buffer.getChannelData(0)
var iR = buffer.getChannelData(1)
// Simple exp decay loop
for(i=0,l=buffer.length;i<l;i++) {
iL[i] = (Math.random() * 2 - 1) * Math.pow(1 - i / len, decay);
iR[i] = (Math.random() * 2 - 1) * Math.pow(1 - i / len, decay);
}
var convolver = oac.createConvolver();
convolver.buffer = buffer;
convolver.connect(oac.destination);
var audiobuffer = getSpecificFile({ sampleRate: sampleRate, numberOfChannels: 1 });
var source0 = oac.createBufferSource();
source0.buffer = audiobuffer;
source0.loop = true;
source0.connect(convolver);
source0.start(0);
return oac;
},
name: "Convolution reverb"
});
registerTestCase({
func: function() {
// this test case is very slow in chrome, reduce the total duration to avoid
// timeout
var duration_adjusted = DURATION / 16;
var oac = new OfflineAudioContext(1, duration_adjusted * sampleRate, sampleRate);
var duration = duration_adjusted * sampleRate;
var audiobuffer = getSpecificFile({ sampleRate: sampleRate, numberOfChannels: 1 });
var offset = 0;
while (offset < duration / sampleRate) {
var grain = oac.createBufferSource();
var gain = oac.createGain();
grain.connect(gain);
gain.connect(oac.destination);
grain.buffer = audiobuffer;
// get a random 100-ish ms with enveloppes
var start = offset * Math.random() * 0.5;
var end = start + 0.005 * (0.999 * Math.random());
grain.start(offset, start, end);
gain.gain.setValueAtTime(offset, 0);
gain.gain.linearRampToValueAtTime(.5, offset + 0.005);
var startRelease = Math.max(offset + (end - start), 0);
gain.gain.setValueAtTime(0.5, startRelease);
gain.gain.linearRampToValueAtTime(0.0, startRelease + 0.05);
// some overlap
offset += 0.005;
}
return oac;
},
name: "Granular synthesis"
});
registerTestCase({
func: function() {
var sampleRate = 44100;
var duration = DURATION;
var oac = new OfflineAudioContext(1, duration * sampleRate, 44100);
var offset = 0;
while (offset < duration) {
var note = oac.createOscillator();
var env = oac.createGain();
note.type = "sawtooth";
note.frequency.value = 110;
note.connect(env);
env.gain.setValueAtTime(0, 0);
env.gain.setValueAtTime(0.5, offset);
env.gain.setTargetAtTime(0, offset+0.01, 0.1);
env.connect(oac.destination);
note.start(offset);
note.stop(offset + 1.0);
offset += 140 / 60 / 4; // 140 bpm
}
return oac;
},
name: "Synth"
});
registerTestCase({
func: function() {
var sampleRate = 44100;
var duration = DURATION;
var oac = new OfflineAudioContext(1, duration * sampleRate, sampleRate);
var offset = 0;
var osc = oac.createOscillator();
osc.type = "sawtooth";
var enveloppe = oac.createGain();
enveloppe.gain.setValueAtTime(0, 0);
var filter = oac.createBiquadFilter();
osc.connect(enveloppe);
enveloppe.connect(filter);
filter.connect(oac.destination);
filter.frequency.setValueAtTime(0.0, 0.0);
filter.Q.setValueAtTime(20, 0.0);
osc.start(0);
osc.frequency.setValueAtTime(110, 0);
while (offset < duration) {
enveloppe.gain.setValueAtTime(1.0, offset);
enveloppe.gain.setTargetAtTime(0.0, offset, 0.1);
filter.frequency.setValueAtTime(0, offset);
filter.frequency.setTargetAtTime(3500, offset, 0.03);
offset += 140 / 60 / 16;
}
return oac;
},
name: "Substractive synth"
});
registerTestCase({
func: function () {
var oac = new OfflineAudioContext(2, DURATION * sampleRate, sampleRate);
var source0 = oac.createBufferSource();
var panner = oac.createStereoPanner();
source0.buffer = getSpecificFile({ sampleRate: oac.sampleRate, numberOfChannels: 2 });
source0.loop = true;
panner.pan = 0.1;
source0.connect(panner);
panner.connect(oac.destination);
source0.start(0);
return oac;
},
name: "Stereo Panning"
});
registerTestCase({
func: function () {
var oac = new OfflineAudioContext(2, DURATION * sampleRate, sampleRate);
var source0 = oac.createBufferSource();
var panner = oac.createStereoPanner();
source0.buffer = getSpecificFile({ sampleRate: oac.sampleRate, numberOfChannels: 2 });
source0.loop = true;
panner.pan.setValueAtTime(-0.1, 0.0);
panner.pan.setValueAtTime(0.2, 0.5);
source0.connect(panner);
panner.connect(oac.destination);
source0.start(0);
return oac;
},
name: "Stereo Panning with Automation"
});
registerTestCase({
func: function () {
var oac = new OfflineAudioContext(2, DURATION * sampleRate, sampleRate);
var osc = oac.createOscillator();
osc.type = 'sawtooth';
var freq = 2000;
osc.frequency.value = freq;
osc.frequency.linearRampToValueAtTime(20, 10.0);
osc.connect(oac.destination);
osc.start(0);
return oac;
},
name: "Periodic Wave with Automation"
});
if (typeof(window) == "undefined") {
exports.benchmarks = benchmarks;
}