audio - 使用SuperCollider记录WAV文件

Question

我编写了以下代码，以定义一个SynthDef，该声音将声音记录到作为参数之一传递的缓冲区中。

(
SynthDef(\recordTone, { |freq, bufnum, duration|
    var w = SinOsc.ar(freq) * XLine.ar(101,1,duration,add: -1) / 100;
    RecordBuf.ar(w!2,bufnum,loop: 0,doneAction: 2);
}).add;
)

我也有下面的代码，它为上述SynthDef调用了Synth，并试图将缓冲区写入文件中。

({
    var recordfn = { |freq, duration, fileName|
        var server = Server.local;
        var buf = Buffer.alloc(server,server.sampleRate * duration,2);

        Synth(\recordTone,[\freq, 440, \bufnum, buf.bufnum, \duration, duration]);
        buf.write(
            "/Users/minerva/Temp/snd/" ++ fileName ++ ".wav",
            "WAVE",
            "int16",
            completionMessage: ["b_free", buf.bufnum]
        );
    };

    recordfn.value(440,0.5,"test");

}.value)

正在创建输出文件，但不包含任何可听见的声音。我究竟做错了什么？我仔细阅读了所有SuperCollider文档，但似乎没有任何效果!任何指针，不胜感激。

Answer 1

根据Dan S的回答，我进行了一些更改以使此工作有效:

(
SynthDef(\playTone, { |freq, duration|
    var w = SinOsc.ar(freq) * XLine.ar(1001,1,duration,add: -1,doneAction:2) / 1000;
    Out.ar(0,w!2);
}).add;
)

(
SynthDef(\recordTone, { |buffer|
    RecordBuf.ar(In.ar(0,2), buffer, loop: 0, doneAction: 2);
}).add;
)

(Routine({
    var recordfn = { |freq, duration|
        var server = Server.local;
        var buffer = Buffer.alloc(server, server.sampleRate * duration, 2);

        server.sync;

        server.makeBundle(func: {
            var player = Synth(\playTone, [\freq, freq, \duration, duration]);
            var recorder = Synth.after(player, \recordTone, [\buffer, buffer]);
        });

        duration.wait;

        buffer.write(
            "/Users/minerva/Temp/snd/test.wav",
            "WAVE",
            "int16",
            completionMessage: ["/b_free", buffer]
        );
    };

    recordfn.value(440,0.1);

}).next)