java - 保存多 channel 音频文件

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我正在尝试使用 Java Sound API 将两个数据缓冲区作为单独的 channel 输出到一个音频文件中。我找到了输出单声道音频的方法，但这并不是我真正想要的。我也不知道应该使用哪种音频格式(WAV、MP3 等)。我的两个数据缓冲区是范围从 -127 到 +127 的字节数组。

Answer 1

这里有一些示例代码，向您展示如何创建 WAV 文件。 Java 并没有真正支持 MP3，尽管有相应的库。

import javax.sound.sampled.AudioFileFormat;
import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.IOException;

public class StereoOutput {

    public static void main(final String[] args) throws IOException {

        // left samples - typically more than 4!!
        final byte[] left = new byte[] {1, 2, 3, 4};
        // right samples
        final byte[] right = new byte[] {1, 2, 3, 4};

        final ByteArrayInputStream interleavedStream = createInterleavedStream(left, right);

        // audio format of the stream we created
        final AudioFormat audioFormat = new AudioFormat(
                AudioFormat.Encoding.PCM_SIGNED,
                44100f, // sample rate - you didn't specify, 44.1k is typical
                8,      // how many bits per sample, i.e. per value in your byte array
                2,      // you want two channels (stereo)
                2,      // number of bytes per frame (frame == a sample for each channel)
                44100f, // frame rate
                true);  // byte order
        final int numberOfFrames = left.length; // one frame contains both a left and a right sample
        // wrap stream into AudioInputStream (data + format)
        final AudioInputStream audioStream = new AudioInputStream(interleavedStream, audioFormat, numberOfFrames);
        // write to WAV file
        AudioSystem.write(audioStream, AudioFileFormat.Type.WAVE, new File("out.wave"));
    }

    /**
     * Typically in PCM audio, left and right samples are interleaved.
     * I.e.: LR LR LR LR.
     * One LR is also called a "frame".
     *
     * @param left array with left samples
     * @param right array with right samples
     * @return stream that contains all samples in LR LR interleaved order
     */
    private static ByteArrayInputStream createInterleavedStream(final byte[] left, final byte[] right) {
        final byte[] interleaved = new byte[left.length + right.length];
        for (int i=0; i<left.length; i++) {
            interleaved[2*i] = left[i];
            interleaved[2*i+1] = right[i];
        }
        return new ByteArrayInputStream(interleaved);
    }
}

我建议您通过 Java Sound Trail 进行操作还可以查看 Java API 文档中类似 AudioFormat 的类。如果您不熟悉PCM ，也阅读一下。这对于理解数字采样音频至关重要。