Quick look
I'm using Sketch.js plugin in this example. I would like to use my pre-signed urls as well but they don't work. Expiration time is set long enough (1 day) so there's something wrong with the JS itself.
I have an S3 bucket where I store some music public protected. Using the official AWS SDK I can generate urls like:
https://d225******.cloudfront.net/song.m4a?Expires=1493381986&Signature=***&Key-Pair-Id=***
I'm using pre-signed urls over my website without any problem, but in this script won't work:
<script>
var ALPHA, AudioAnalyser, COLORS, MP3_PATH, NUM_BANDS, NUM_PARTICLES, Particle, SCALE, SIZE, SMOOTHING, SPEED, SPIN;
MP3_PATH = 'my_presigned_url';
AudioAnalyser = (function() {
AudioAnalyser.AudioContext = self.AudioContext || self.webkitAudioContext;
AudioAnalyser.enabled = AudioAnalyser.AudioContext != null;
function AudioAnalyser(audio, numBands, smoothing) {
var src;
this.audio = audio != null ? audio : new Audio();
this.numBands = numBands != null ? numBands : 256;
this.smoothing = smoothing != null ? smoothing : 0.3;
if (typeof this.audio === 'string') {
src = this.audio;
this.audio = new Audio();
this.audio.crossOrigin = "anonymous";
this.audio.controls = true;
this.audio.src = src;
}
this.context = new AudioAnalyser.AudioContext();
this.jsNode = this.context.createScriptProcessor(2048, 1, 1);
this.analyser = this.context.createAnalyser();
this.analyser.smoothingTimeConstant = this.smoothing;
this.analyser.fftSize = this.numBands * 2;
this.bands = new Uint8Array(this.analyser.frequencyBinCount);
this.audio.addEventListener('canplay', (function(_this) {
return function() {
_this.source = _this.context.createMediaElementSource(_this.audio);
_this.source.connect(_this.analyser);
_this.analyser.connect(_this.jsNode);
_this.jsNode.connect(_this.context.destination);
_this.source.connect(_this.context.destination);
return _this.jsNode.onaudioprocess = function() {
_this.analyser.getByteFrequencyData(_this.bands);
if (!_this.audio.paused) {
return typeof _this.onUpdate === "function" ? _this.onUpdate(_this.bands) : void 0;
}
};
};
})(this));
}
AudioAnalyser.prototype.start = function() {
return this.audio.play();
};
AudioAnalyser.prototype.stop = function() {
return this.audio.pause();
};
return AudioAnalyser;
})();
Sketch.create({
particles: [],
setup: function() {
var analyser, error, i, intro, j, particle, ref, warning, x, y;
for (i = j = 0, ref = NUM_PARTICLES - 1; j <= ref; i = j += 1) {
x = random(this.width);
y = random(this.height * 2);
particle = new Particle(x, y);
particle.energy = random(particle.band / 256);
this.particles.push(particle);
}
if (AudioAnalyser.enabled) {
try {
analyser = new AudioAnalyser(MP3_PATH, NUM_BANDS, SMOOTHING);
analyser.onUpdate = (function(_this) {
return function(bands) {
var k, len, ref1, results;
ref1 = _this.particles;
results = [];
for (k = 0, len = ref1.length; k < len; k++) {
particle = ref1[k];
results.push(particle.energy = bands[particle.band] / 256);
}
return results;
};
})(this);
analyser.start();
document.getElementById('player-container').appendChild(analyser.audio);
document.getElementsByTagName("audio")[0].setAttribute("id", "dy_wowaudio");
intro = document.getElementById('intro');
intro.style.display = 'none';
} catch (_error) {
error = _error;
}
}
}
});
// generated by coffee-script 1.9.2
</script>
The script works fine (as you can see in the example above) without a pre-signed url, so what can I do to use my pre-signed urls inside AudioAnalyser
function ?
I've seen html5 video tags make multiple requests. I assume to fetch some meta-data like play length and the first frame of video to use as a thumbnail. You might try playing with the preload attribute to prevent this.
Specifically, if the clip is small, preload="auto"
might be everything you need. If the browser has to make follow requests you're gonna have a hard time I think. Here's some relevant info
Another way to go about this that I think may work more reliably is to generate temporary credentials as needed.
See the docs for more on this: - Requesting temp creds - Accessing resources with temp creds
Combined with a JS package for signing AWS requests like binoculars/aws-sigv4 or copy someone else who's doing this in-browser.
Share your browser error message if any. It may by problem related to cross origin for S3 bucket data.
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