android AudioRecord修改音量

要修改录音音量，可以通过调整AudioRecord对象的采样率和音频格式来实现。下面是一个简单的示例代码：

//设置采样率为16kHz
int sampleRate = 16000;

//设置音频格式为PCM编码
int audioFormat = AudioFormat.ENCODING_PCM_16BIT;

//设置录音声道为单声道
int channelConfig = AudioFormat.CHANNEL_IN_MONO;

//设置缓冲区大小
int bufferSize = AudioRecord.getMinBufferSize(sampleRate, channelConfig, audioFormat);

//创建AudioRecord对象
AudioRecord audioRecord = new AudioRecord(MediaRecorder.AudioSource.MIC, sampleRate, channelConfig, audioFormat, bufferSize);

//开始录音
audioRecord.startRecording();

byte[] buffer = new byte[bufferSize];
int read = 0;
while (true) {
    read = audioRecord.read(buffer, 0, bufferSize);
    if (read > 0) {
        //修改音量
        for (int i = 0; i < read / 2; i++) {
            //左右声道分别处理
            short left = (short) ((buffer[i * 2] & 0xff) | (buffer[i * 2 + 1] << 8));
            short right = (short) ((buffer[i * 2 + 2] & 0xff) | (buffer[i * 2 + 3] << 8));
            //将左右声道的音量都增加一倍
            left *= 2;
            right *= 2;
            //处理后的左右声道数据写回缓冲区
            buffer[i * 2] = (byte) (left & 0xff);
            buffer[i * 2 + 1] = (byte) ((left >> 8) & 0xff);
            buffer[i * 2 + 2] = (byte) (right & 0xff);
            buffer[i * 2 + 3] = (byte) ((right >> 8) & 0xff);
        }
        //将处理后的缓冲区数据写入文件或进行其他处理
    }
}

//停止录音
audioRecord.stop();
audioRecord.release();

在上面的代码中，我们使用了一个简单的算法来将左右声道的音量都增加一倍。你也可以根据需要使用其他算法来调整音量。