poi*_*occ 33 javascript audio microphone recording web-audio-api
是否可以使用客户端JavaScript从浏览器访问麦克风(内置或辅助)？
理想情况下,它会将录制的音频存储在浏览器中.谢谢!
Sco*_*and 45
在这里,我们使用getUserMedia()将麦克风音频捕获为Web Audio API事件循环缓冲区 - 打印每个音频事件循环缓冲区的时域和频域片段(可在浏览器控制台中查看,只需按键F12或ctrl + shift + i)
<html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>capture microphone audio into buffer</title>
<script type="text/javascript">
var webaudio_tooling_obj = function () {
var audioContext = new AudioContext();
console.log("audio is starting up ...");
var BUFF_SIZE = 16384;
var audioInput = null,
microphone_stream = null,
gain_node = null,
script_processor_node = null,
script_processor_fft_node = null,
analyserNode = null;
if (!navigator.getUserMedia)
navigator.getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia ||
navigator.mozGetUserMedia || navigator.msGetUserMedia;
if (navigator.getUserMedia){
navigator.getUserMedia({audio:true},
function(stream) {
start_microphone(stream);
},
function(e) {
alert('Error capturing audio.');
}
);
} else { alert('getUserMedia not supported in this browser.'); }
// ---
function show_some_data(given_typed_array, num_row_to_display, label) {
var size_buffer = given_typed_array.length;
var index = 0;
var max_index = num_row_to_display;
console.log("__________ " + label);
for (; index < max_index && index < size_buffer; index += 1) {
console.log(given_typed_array[index]);
}
}
function process_microphone_buffer(event) { // invoked by event loop
var i, N, inp, microphone_output_buffer;
microphone_output_buffer = event.inputBuffer.getChannelData(0); // just mono - 1 channel for now
// microphone_output_buffer <-- this buffer contains current gulp of data size BUFF_SIZE
show_some_data(microphone_output_buffer, 5, "from getChannelData");
}
function start_microphone(stream){
gain_node = audioContext.createGain();
gain_node.connect( audioContext.destination );
microphone_stream = audioContext.createMediaStreamSource(stream);
microphone_stream.connect(gain_node);
script_processor_node = audioContext.createScriptProcessor(BUFF_SIZE, 1, 1);
script_processor_node.onaudioprocess = process_microphone_buffer;
microphone_stream.connect(script_processor_node);
// --- enable volume control for output speakers
document.getElementById('volume').addEventListener('change', function() {
var curr_volume = this.value;
gain_node.gain.value = curr_volume;
console.log("curr_volume ", curr_volume);
});
// --- setup FFT
script_processor_fft_node = audioContext.createScriptProcessor(2048, 1, 1);
script_processor_fft_node.connect(gain_node);
analyserNode = audioContext.createAnalyser();
analyserNode.smoothingTimeConstant = 0;
analyserNode.fftSize = 2048;
microphone_stream.connect(analyserNode);
analyserNode.connect(script_processor_fft_node);
script_processor_fft_node.onaudioprocess = function() {
// get the average for the first channel
var array = new Uint8Array(analyserNode.frequencyBinCount);
analyserNode.getByteFrequencyData(array);
// draw the spectrogram
if (microphone_stream.playbackState == microphone_stream.PLAYING_STATE) {
show_some_data(array, 5, "from fft");
}
};
}
}(); // webaudio_tooling_obj = function()
</script>
</head>
<body>
<p>Volume</p>
<input id="volume" type="range" min="0" max="1" step="0.1" value="0.5"/>
</body>
</html>
由于此代码将麦克风数据公开为缓冲区,您可以使用websockets添加流的功能,或者只是将每个事件循环缓冲区聚合到怪物缓冲区中,然后将怪物下载到文件中
注意来电
var audioContext = new AudioContext();
这表明它使用了所有现代浏览器(包括移动浏览器)中的Web Audio API,以提供一个非常强大的音频平台,其中只有一个小片段... ... 注意 CPU使用量因此而跳跃演示将每个事件循环缓冲区写入浏览器控制台日志,该日志仅用于测试,因此实际使用的资源密集程度要低得多,即使您将此模块流式传输到其他地方
链接到一些Web Audio API文档
是的你可以.
使用
getUserMedia()API,您可以捕获麦克风的原始音频输入.
https://nusofthq.com/blog/recording-mp3-using-only-html5-and-javascript-recordmp3-js/
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