audio - 网络音频声音未播放

Question

我有以下代码来播放加载到缓冲区中的特定声音。

sound1.gainNode = context.createGain();
sound1.source = context.createBufferSource();
sound1.source.buffer = soundBuffers[num];
sound1.source.connect(sound1.gainNode);
sound1.gainNode.connect(context.destination);
sound1.source.looping = true;
sound1.source.start(0);

这是我所谓的更改音量方法:

<input type="range" min="0" max="100" value="70" id="playBtn1_vol" onchange="changeVolume(this,sound1Gain)" style="display:none">

这是更改量方法:

function changeVolume = function(element,soundNo){
      var volume = element.value;
      var fraction = parseInt(element.value) / parseInt(element.max);
      // Using an x^2 progression as it gives a better sound than linear.
      soundNo.gainNode.gain.value = fraction * fraction;
    };

在尝试使用增益使音量工作之前，它的运行情况还不错，但现在已经坏了，我找不到问题所在。如果有人能指出我正确的方向，将不胜感激。

Answer 1

这是示例代码(js)，可以为您提供帮助。 Reference

var VolumeSample = {
};

// Gain node needs to be mutated by volume control.
VolumeSample.gainNode = null;

VolumeSample.play = function() {
  if (!context.createGain)
    context.createGain = context.createGainNode;
  this.gainNode = context.createGain();
  var source = context.createBufferSource();
  source.buffer = BUFFERS.techno;

  // Connect source to a gain node
  source.connect(this.gainNode);
  // Connect gain node to destination
  this.gainNode.connect(context.destination);
  // Start playback in a loop
  source.loop = true;
  if (!source.start)
    source.start = source.noteOn;
  source.start(0);
  this.source = source;
};

VolumeSample.changeVolume = function(element) {
  var volume = element.value;
  var fraction = parseInt(element.value) / parseInt(element.max);
  // Let's use an x*x curve (x-squared) since simple linear (x) does not
  // sound as good.
  this.gainNode.gain.value = fraction * fraction;
};

VolumeSample.stop = function() {
  if (!this.source.stop)
    this.source.stop = source.noteOff;
  this.source.stop(0);
};

VolumeSample.toggle = function() {
  this.playing ? this.stop() : this.play();
  this.playing = !this.playing;
};