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我在Sketch.js示例中使用了this插件。一世 我也希望使用我预先签名的网址,但他们不会工作。 到期时间设置得足够长(1天),因此出现了问题 与JS本身。
我有一个S3存储桶,我存储了一些受公共保护的音乐。 使用官方AWS SDK,我可以生成以下网址:
<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>
我在我的网站上使用预先签名的网址没有任何问题,但是在这个脚本中没有工作:
AudioAnalyser
在没有预先签名的网址的情况下,该脚本运行正常(正如您在上面的示例中看到的那样),因此如何在X[np.sort(X[:,3].argsort()[:3])]
函数中使用我预先签名的网址? ?
答案 0 :(得分:0)
我看过html5视频标签发出了多个请求。我假设要获取一些元数据,如播放长度和第一帧视频用作缩略图。您可以尝试使用preload属性来防止这种情况。
具体来说,如果剪辑很小,public int binarySearch(Integer[] targetArray, int targetValue, int lowIndex, int highIndex){
if (lowIndex > highIndex)
return -1;
int midIndex = lowIndex + (highIndex - lowIndex)/2;
if (targetValue == targetArray[midIndex])
return midIndex;
if(targetArray[midIndex] > targetValue)
return binarySearch(targetArray, targetValue, lowIndex, midIndex - 1);
else //if(targetArray[midIndex] < targetValue)
return binarySearch(targetArray, targetValue, midIndex + 1, highIndex);
//return -1; // replace this with your recursive binary search code
}
可能就是您需要的一切。如果浏览器必须提出以下请求,那么我认为你会很难。 Here's some relevant info
我认为可以更可靠地工作的另一种方法是根据需要生成临时凭证。
有关详细信息,请参阅文档: - Requesting temp creds - Accessing resources with temp creds
与用于签署AWS请求的JS程序包相结合,例如binoculars/aws-sigv4或copy someone else在浏览器中执行此操作。
答案 1 :(得分:-2)
分享您的浏览器错误消息(如果有)。它可能与S3存储桶数据的交叉原点有关。