个人中心
gpt4 book ai didi

jquery - 使用 Web Audio API，是否可以关闭扬声器的音量，但输入仍然存在

转载 作者：可可西里 更新时间：2023-11-01 13:22:02 25 4
gpt4 key购买 nike

我正在尝试使用 Web Audio API 从笔记本电脑的麦克风录制人声。

录音正常

但是有一个问题，就是语音从扬声器中流出。所以在录音的时候，我会同时听到我说的话。

我正在寻找避免此问题的方法。帮我!谢谢。

最佳答案

下面使用浏览器音量小部件启动 Web Audio API session ，因此只需向下滑动音量 ... Web Audio API 以节点为中心 ... 而不是直接将 audioContext 与麦克风连接我引入gain_node作为中介

    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_RENDERER, 1, 1);
    script_processor_node.onaudioprocess = process_microphone_buffer;

    microphone_stream.connect(script_processor_node);

为了对输出扬声器启用音量控制，我定义了一个对该 gain_node 的回调

    document.getElementById('volume').addEventListener('change', function() {

        var curr_volume = this.value;
        gain_node.gain.value = curr_volume;

        console.log("curr_volume ", curr_volume);
    });

以上所有内容都打包成一个自包含的 html 文件

<html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>capture microphone then show time & frequency domain output</title>

<script type="text/javascript">

var webaudio_tooling_obj = function () {

    var audioContext = new AudioContext();

    console.log("audio is starting up ...");

    var BUFF_SIZE_RENDERER = 16384;
    var SIZE_SHOW = 3; // number of array elements to show in console output

    var audioInput = null,
    microphone_stream = null,
    gain_node = null,
    script_processor_node = null,
    script_processor_analysis_node = null,
    analyser_node = 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;

        console.log("__________ " + label);

        if (label === "time") {

            for (; index < num_row_to_display && index < size_buffer; index += 1) {

                var curr_value_time = (given_typed_array[index] / 128) - 1.0;

                console.log(curr_value_time);
            }

        } else if (label === "frequency") {

            for (; index < num_row_to_display && index < size_buffer; index += 1) {

                console.log(given_typed_array[index]);
            }

        } else {

            throw new Error("ERROR - must pass time or frequency");
        }
    }

    function process_microphone_buffer(event) {

        var i, N, inp, microphone_output_buffer;

        // not needed for basic feature set
        // microphone_output_buffer = event.inputBuffer.getChannelData(0); // just mono - 1 channel for now
    }

    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_RENDERER, 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_analysis_node = audioContext.createScriptProcessor(2048, 1, 1);
        script_processor_analysis_node.connect(gain_node);

        analyser_node = audioContext.createAnalyser();
        analyser_node.smoothingTimeConstant = 0;
        analyser_node.fftSize = 2048;

        microphone_stream.connect(analyser_node);

        analyser_node.connect(script_processor_analysis_node);

        var buffer_length = analyser_node.frequencyBinCount;

        var array_freq_domain = new Uint8Array(buffer_length);
        var array_time_domain = new Uint8Array(buffer_length);

        console.log("buffer_length " + buffer_length);

        script_processor_analysis_node.onaudioprocess = function() {

            // get the average for the first channel
            analyser_node.getByteFrequencyData(array_freq_domain);
            analyser_node.getByteTimeDomainData(array_time_domain);

            // draw the spectrogram
            if (microphone_stream.playbackState == microphone_stream.PLAYING_STATE) {

                show_some_data(array_freq_domain, SIZE_SHOW, "frequency");
                show_some_data(array_time_domain, SIZE_SHOW, "time"); // store this to record to aggregate buffer/file
            }
        };
    }

}(); //  webaudio_tooling_obj = function()

</script>

</head>
<body>

    <p>Volume</p>
    <input id="volume" type="range" min="0" max="1" step="0.1" value="0.0"/>

</body>
</html>

关于jquery - 使用 Web Audio API，是否可以关闭扬声器的音量，但输入仍然存在，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/45503318/

25 4 0
文章推荐： php - 完全基于 ajax 的 Web 应用程序的良好 php 框架？
文章推荐： windows - 在 Vim for Windows 上设置 Cygwin shell 路径
文章推荐： php - 为什么会出现mime类型与firefox、chrome不一致的问题？
文章推荐： javascript - 如果字符数 =< 160，如何将初始 SMS 数显示为 1？
可可西里
个人简介

我是一名优秀的程序员,十分优秀！

滴滴打车优惠券免费领取
滴滴打车优惠券
全站热门文章
Copyright 2021 - 2024 cfsdn All Rights Reserved 蜀ICP备2022000587号
广告合作:1813099741@qq.com 6ren.com