Does MediaElementSource uses less memory than BufferSource in Web Audio API?

问题

I am making a little app that will play audio files (mp3,wav) with the ability to use an equalizer on them (say a regular Audio Player), for this I am using the Web Audio Api.

I manage to get the play part in two ways. Using decodeAudioData of BaseAudioContext

function getData() {
  source = audioCtx.createBufferSource();
  var request = new XMLHttpRequest();

  request.open('GET', 'viper.ogg', true);

  request.responseType = 'arraybuffer';


  request.onload = function() {
    var audioData = request.response;

    audioCtx.decodeAudioData(audioData, function(buffer) {
        source.buffer = buffer;

        source.connect(audioCtx.destination);
        source.loop = true;
      },

      function(e){ console.log("Error with decoding audio data" + e.err); });

  }

  request.send();
}

// wire up buttons to stop and play audio

play.onclick = function() {
  getData();
  source.start(0);
  play.setAttribute('disabled', 'disabled');
}

and and much easier way with Audio() and createMediaElementSource()

let audioContainer = new Audio('assets/mp3/pink_noise.wav');
let _sourceNodes = _AudioContext.createMediaElementSource(_audioContainer);
_sourceNodes.connect(_AudioContext.destination);
_audioContainer.play();

I think the second one use less memory than createBufferSource() because createBufferSource() stores the complete audio file in memory. But I am not sure about this I really do not have to much experience with tools like Chrome Dev tools to read it correctly.

Does createMediaElementSource() use less memory than createBufferSource() ?

Edit: Using Chrome's Task Manager seems like when using createBufferSource() just loading the file increases the Memory column something around 40000k against +/-60k with createMediaElementSource(), and the Javascript Memory 1000k vs 20k

回答1:

I think you've found the answer in the task manager.

You need to be aware of a couple of things.

With a media element, you lose sample-accurate control; this may not be important to you
You need appropriate access permissions when using a MediaElementAudioSourceNode; this may not be a problem if all of your assets are on the same server

来源：https://stackoverflow.com/questions/48403472/does-mediaelementsource-uses-less-memory-than-buffersource-in-web-audio-api

标签

javascript

web-audio-api