ScriptProcessorNode的独特立体声输入

时间:2014-10-16 21:25:20

标签: web-audio modulation scriptprocessor

我希望在Web Audio API中实现音频效果,这需要连续访问两个或更多音频流。

我可以定义一个带有2个输入通道和2个输出通道的脚本处理器:

var mod = context.createScriptProcessor(4096,2,2);

然后我可以将几个正弦波连接到这个处理器:

mySine.connect(mod);
mySine2.connect(mod);

有没有办法将它们连接到音频处理器的特定输入通道?

最后,当我编写onaudioprocess函数并单独收听每个输入通道时,每个输入通道都包含所有连接到处理器的声音。我无法在onaudioprocess函数中单独访问每个正弦波。它是否正确?或者有没有办法将声音连接到脚本处理器的单个输入通道?

1 个答案:

答案 0 :(得分:3)

您可以创建两个相同的单通道ScriptProcessors,也可以使用通道合并将两个正弦波分配给脚本处理器的每个通道,如下所示:

var context = new AudioContext();   

var sineA = context.createOscillator();
sineA.type = 'sine';
sineA.frequency.value = 300;

var sineB = context.createOscillator();
sineB.type = 'sine';
sineB.frequency.value = 100;

var script = context.createScriptProcessor(4096, 2, 2);

// create 2 channel merger node
var merger = context.createChannelMerger(2);

// connect sineA to channel 0
sineA.connect(merger, 0, 0);

// connect sineA to channel 1
sineB.connect(merger, 0, 1);

// connect the script to the merger
merger.connect(script);

// process the audio data of each channel
script.onaudioprocess = function(event) {
  var input = event.inputBuffer;
  var output = event.outputBuffer;
  var inputA = input.getChannelData(0);
  var inputB = input.getChannelData(1);
  var outputA = output.getChannelData(0);
  var outputB = output.getChannelData(1);
  
  for (var i = 0; i < input.length; i++) {
    outputA[i] = inputA[i];
    outputB[i] = inputB[i];
  }
}

script.connect(context.destination);

sineA.start();
sineB.start();