Java是否为音频_synthesis_内置了库？

Question

注意：我不想“读取音频文件foo.bar并播放它”。我想以编程方式即时生成音频文件并进行播放。Java是否为此内置了库，还是属于系统依赖的库？谢谢！

Answer 1

此Sun论坛帖子中包含一些有趣的代码，用于生成单音。同样，鉴于WAV文件格式不是太复杂，您可以创建一个代表所需波形的表，然后将其写入文件。周围有一些示例，例如原始音频转换器以及如何编写wav文件。

Answer 2

最简单的方法是使用Java的内置MIDI库：

int channel = 0; // 0 is a piano, 9 is percussion, other channels are for other instruments

    int volume = 80; // between 0 et 127

    int duration = 200; // in milliseconds

    try {

        Synthesizer synth = MidiSystem.getSynthesizer();

        synth.open();

        MidiChannel[] channels = synth.getChannels();

        // --------------------------------------

        // Play a few notes.

        // The two arguments to the noteOn() method are:

        // "MIDI note number" (pitch of the note),

        // and "velocity" (i.e., volume, or intensity).

        // Each of these arguments is between 0 and 127.

        channels[channel].noteOn( 60, volume ); // C note

        Thread.sleep( duration );

        channels[channel].noteOff( 60 );

        channels[channel].noteOn( 62, volume ); // D note

        Thread.sleep( duration );

        channels[channel].noteOff( 62 );

        channels[channel].noteOn( 64, volume ); // E note

        Thread.sleep( duration );

        channels[channel].noteOff( 64 );

        Thread.sleep( 500 );

        // --------------------------------------

        // Play a C major chord.

        channels[channel].noteOn( 60, volume ); // C

        channels[channel].noteOn( 64, volume ); // E

        channels[channel].noteOn( 67, volume ); // G

        Thread.sleep( 3000 );

        channels[channel].allNotesOff();

        Thread.sleep( 500 );

        synth.close();

    }

    catch (Exception e) {

        e.printStackTrace();

    }