我有一个基于画布的二维网络音频游戏,其中包括使用网络音频api在画布上的特定像素坐标上的空间化音源。
虽然我已经成功地使用网络音频pannerNode在画布元素上精确地定位了每个音源,就像这样。
var canvas = document.getElementById("map");
var context = canvas.getContext("2d");
function audioFileLoader(fileDirectory) {
var soundObj = {};
var playSound = undefined;
var panner = undefined;
var gainNode = undefined;
var getSound = new XMLHttpRequest();
soundObj.fileDirectory = fileDirectory;
getSound.open("GET", soundObj.fileDirectory, true);
getSound.responseType = "arraybuffer";
getSound.onload = function() {
audioContext.decodeAudioData(getSound.response, function(buffer) { soundObj.soundToPlay = buffer;
}); };
getSound.send();
panner = audioContext.createPanner();
panner.panningModel = 'HRTF';
soundObj.position = function(x,y,z) {
panner.setPosition(x,y,z);
};
我现在试图使用Resonance Audio Web SDK升级音频空间化,这样我就可以使用其更高级的音频空间化特性。
我如何使用Resonance Audio的setPosition来定义画布元素上音频源的像素(x,y)位置?
我似乎不知道如何将 Resonance Audio 的原生刻度(米)转换为画布元素上的像素坐标。我想如果我能解决这个问题,我就可以在2D游戏中定义不同音频室的大小和位置,这将是非常酷的。
谢谢,我有一个基于二维画布的二维游戏。
所以,事实证明,如果你得到画布上的像素坐标,在那里你想定位你的音源,然后使用相同的单位(像素)来定位和更新监听器的位置,那么一切都很好。只要你对你的音源和你的听众使用相同的单位,那么他们就会保持相对的关系,共振音频空间化就会工作。
// Set some global variables
var canvas = document.getElementById("map");
var context = canvas.getContext("2d");
var mouseX;
var mouseY;
// Map event functions
// Get mouse coordinates on the map element
function updateCoords() {
mouseX = event.offsetX;
mouseY = event.offsetY;
}
// Create mouse event functions
function moveAroundMap(event) {
updateCoords();
mapX.innerText = mouseX;
mapY.innerText = mouseY;
// Update the listener position on the canvas in pixels (x,y)
resonanceAudioScene.setListenerPosition(mouseX,mouseY,-20); // elevate the listener rather than lowering the sources
}
map.addEventListener("mousemove", moveAroundMap, false);
// Create an AudioContext
let audioContext = new AudioContext();
// Create a (third-order Ambisonic) Resonance Audio scene and pass it
// the AudioContext.
let resonanceAudioScene = new ResonanceAudio(audioContext);
resonanceAudioScene.setAmbisonicOrder(3);
// Connect the scene’s binaural output to stereo out.
resonanceAudioScene.output.connect(audioContext.destination);
// Create an AudioElement.
let audioElement = document.createElement('audio');
// Load an audio file into the AudioElement.
audioElement.src = './samples/mono-seagulls.mp3';
audioElement.loop = true;
// Generate a MediaElementSource from the AudioElement.
let audioElementSource = audioContext.createMediaElementSource(audioElement);
// Add the MediaElementSource to the scene as an audio input source.
let source = resonanceAudioScene.createSource();
audioElementSource.connect(source.input);
// Set the source position relative to the listener
source.setPosition(140, 150, 0);