javascript - 让多个振荡器一起发挥作用

Question

我构建了一个振荡器，带有用于频率、失谐、增益、波形的 slider 以及用于打开和关闭振荡器的按钮。就其本身而言，它完全按照我的预期和希望它工作。然而，当我复制代码来制作新的振荡器供其使用时，即使我使用 osc.disconnect() ，振荡器也只播放一次，并且波形 slider 也非常挑剔。据我所知，当我点击调用 osc 时，问题出在我的播放/暂停按钮上。

这是我的播放按钮的代码:

$('#play_pause_osc1').click(function () {
    if ($(this).val() == "Play Osc1") {
        $(this).val("Pause");
        osc1();
    } else {
        $(this).val("Play Osc1");
        osc1.disconnect();
    }
});

第一次点击后出现的错误是:

Uncaught TypeError: Property 'osc1' of object [object Object] is not a function

考虑到其他 osc 只是第一个重复的 osc，我也遇到同样的错误。

这是我的代码: http://jsfiddle.net/ryanhagz/YRsE7/1/

Answer 1

试试这个:- http://jsfiddle.net/adiioo7/YRsE7/3/

您正在使用ocs1作为函数以及产生冲突的振荡器对象。

JS:-

//WEB AUDIO SET UP//
//used start web audio
var ctx = new webkitAudioContext();
speakers = ctx.destination;
var osc1= ctx.createOscillator();
var osc2= ctx.createOscillator();
var osc3= ctx.createOscillator();

$(document).ready(function () {

    //WAVEFORM OBJECTS - used to set the value of "cur_wave_osc" under Waveform sliders.//
    var wF = {
        0: "Sine",
        1: "Square",
        2: "Sawtooth",
        3: "Triangle"
    };
    //PLAY_PAUSE BUTTONS - used to play & pause the oscillators.//
    //OSC1 PLAY_PAUSE//
    $('#play_pause_osc1').click(function () {
        if ($(this).val() == "Play Osc1") {
            $(this).val("Pause");
            oscillator1Start();
        } else {
            $(this).val("Play Osc1");
            osc1.disconnect();
        }
    });
    //OSC2 PLAY_PAUSE//
    $('#play_pause_osc2').click(function () {
        if ($(this).val() == "Play Osc2") {
            $(this).val("Pause");
            oscillator2Start();
        } else {
            $(this).val("Play Osc2");
            osc2.disconnect();
        }
    });
    //OSC3 PLAY_PAUSE//
    $('#play_pause_osc3').click(function () {
        if ($(this).val() == "Play Osc3") {
            $(this).val("Pause");
            oscillator3Start();
        } else {
            $(this).val("Play Osc3");
            osc3.disconnect();
        }
    });
    //GAIN SLIDERS - used for controlling osc volume.//
    //OSC1_GAIN//
    $(function () {
        $("#osc1_vol").slider({
            min: 0,
            max: 1,
            value: 0.5,
            step: 0.01,
            slide: function (event, ui) {
                $("#cur_vol_osc1").val(ui.value);
                gainNode1.gain.value = $("#cur_vol_osc1").val();
            }
        });
        $("#cur_vol_osc1").val($("#osc1_vol").slider("value"));
    });
    //OSC2_GAIN//
    $(function () {
        $("#osc2_vol").slider({
            min: 0,
            max: 1,
            value: 0.5,
            step: 0.01,
            slide: function (event, ui) {
                $("#cur_vol_osc2").val(ui.value);
                gainNode2.gain.value = $("#cur_vol_osc2").val();
            }
        });
        $("#cur_vol_osc2").val($("#osc2_vol").slider("value"));
    });
    //OSC3_GAIN//
    $(function () {
        $("#osc3_vol").slider({
            min: 0,
            max: 1,
            value: 0.5,
            step: 0.01,
            slide: function (event, ui) {
                $("#cur_vol_osc3").val(ui.value);
                gainNode3.gain.value = $("#cur_vol_osc3").val();
            }
        });
        $("#cur_vol_osc3").val($("#osc3_vol").slider("value"));
    });
    //PITCH SLIDERS - used for controlling osc pitch.//
    //OSC1_PITCH//
    $(function () {
        $("#osc1_pitch").slider({
            min: 0,
            max: 25000,
            value: 440,
            step: 0.01,
            slide: function (event, ui) {
                $("#cur_pitch_osc1").val(ui.value);
                osc1.frequency.value = $("#cur_pitch_osc1").val();
            }
        });
        $("#cur_pitch_osc1").val($("#osc1_pitch").slider("value"));
    });
    //OSC2_PITCH//
    $(function () {
        $("#osc2_pitch").slider({
            min: 0,
            max: 25000,
            value: 440,
            step: 0.01,
            slide: function (event, ui) {
                $("#cur_pitch_osc2").val(ui.value);
                osc2.frequency.value = $("#cur_pitch_osc2").val();
            }
        });
        $("#cur_pitch_osc2").val($("#osc2_pitch").slider("value"));
    });
    //OSC3_PITCH//
    $(function () {
        $("#osc3_pitch").slider({
            min: 0,
            max: 25000,
            value: 440,
            step: 0.01,
            slide: function (event, ui) {
                $("#cur_pitch_osc3").val(ui.value);
                osc3.frequency.value = $("#cur_pitch_osc3").val();
            }
        });
        $("#cur_pitch_osc3").val($("#osc3_pitch").slider("value"));
    });
    //DETUNE SLIDER - used for controlling osc detune.//
    //OSC1_DETUNE//
    $(function () {
        $("#osc1_detune").slider({
            min: -4800,
            max: 4800,
            value: 0,
            step: 0.01,
            slide: function (event, ui) {
                $("#cur_detune_osc1").val(ui.value);
                osc1.detune.value = $("#cur_detune_osc1").val();
            }
        });
        $("#cur_detune_osc1").val($("#osc1_detune").slider("value"));
    });
    //OSC2_DETUNE//
    $(function () {
        $("#osc2_detune").slider({
            min: -4800,
            max: 4800,
            value: 0,
            step: 0.01,
            slide: function (event, ui) {
                $("#cur_detune_osc2").val(ui.value);
                osc2.detune.value = $("#cur_detune_osc2").val();
            }
        });
        $("#cur_detune_osc2").val($("#osc2_detune").slider("value"));
    });
    //OSC3_DETUNE//
    $(function () {
        $("#osc3_detune").slider({
            min: -4800,
            max: 4800,
            value: 0,
            step: 0.01,
            slide: function (event, ui) {
                $("#cur_detune_osc3").val(ui.value);
                osc3.detune.value = $("#cur_detune_osc3").val();
            }
        });
        $("#cur_detune_osc3").val($("#osc3_detune").slider("value"));
    });
    //WAVEFORM SLIDERS - used for selecting osc waveform.//
    //OSC1_WAVEFORM//
    $(function () {
        $("#osc1_wave").slider({
            min: 0,
            max: 3,
            value: 0,
            step: 0.01,
            slide: function (event, ui) {
                $("#cur_wave_osc1").val(wF[ui.value]);
            }
        });
        $("#cur_wave_osc1").val("Sine");
        osc1.type = $("#osc1_wave").val();
    });
    //OSC2_WAVEFORM//
    $(function () {
        $("#osc2_wave").slider({
            min: 0,
            max: 3,
            value: 0,
            step: 0.01,
            slide: function (event, ui) {
                $("#cur_wave_osc2").val(wF[ui.value]);
            }
        });
        $("#cur_wave_osc2").val("Sine");
        osc2.type = $("#osc2_wave").val();
    });
    //OSC3_WAVEFORM//
    $(function () {
        $("#osc3_wave").slider({
            min: 0,
            max: 3,
            value: 0,
            step: 0.01,
            slide: function (event, ui) {
                $("#cur_wave_osc3").val(wF[ui.value]);
            }
        });
        $("#cur_wave_osc3").val("Sine");
        osc3.type = $("#osc3_wave").val();
    });
});

//CREATE OSCILLATORS//
//OSC1//
function oscillator1Start() {
    //creates the osc
    osc1 = ctx.createOscillator();
    //sets waveform
    osc1.type = $("#osc1_wave").slider("value"); //0 = sine, 1 = square, 2 = saw, 3 = triangle, 4 = custom
    //sets frequency
    osc1.frequency.value;
    //sets detune
    osc1.detune.value;
    //creates a gain node
    gainNode1 = ctx.createGainNode();
    //connects osc to gain node
    osc1.connect(gainNode1);
    //connects gain node to speakers
    gainNode1.connect(speakers);
    //sets gain value
    gainNode1.gain.value;
    //plays the osc
    osc1.start(0);
}
//OSC2//
function oscillator2Start() {
    //creates the osc
    osc2 = ctx.createOscillator();
    //sets waveform
    osc2.type; //0 = sine, 1 = square, 2 = saw, 3 = triangle, 4 = custom
    //sets frequency
    osc2.frequency.value;
    //sets detune
    osc2.detune.value;
    //creates a gain node
    gainNode2 = ctx.createGainNode();
    //connects osc to gain node
    osc2.connect(gainNode2);
    //connects gain node to speakers
    gainNode2.connect(speakers);
    //sets gain value
    gainNode2.gain.value;
    //plays the osc
    osc2.start(0);
}
//OSC3//
function oscillator3Start() {
    //creates the osc
    osc3 = ctx.createOscillator();
    //sets waveform
    osc3.type; //0 = sine, 1 = square, 2 = saw, 3 = triangle, 4 = custom
    //sets frequency
    osc3.frequency.value;
    //sets detune
    osc3.detune.value;
    //creates a gain node
    gainNode3 = ctx.createGainNode();
    //connects osc to gain node
    osc3.connect(gainNode3);
    //connects gain node to speakers
    gainNode3.connect(speakers);
    //sets gain value
    gainNode3.gain.value;
    //plays the osc
    osc3.start(0);
}