在录制音频时,可以使用AudioRecord类来指定音频源、采样率、通道数量等。要防止音频裁剪,可以先通过AudioRecord.getMinBufferSize()方法获取录制缓冲区的最小大小,并将其用作设备缓冲区大小。同时,还需将采样率和通道数量设置为适当的值,以确保录制过程中不会出现波峰裁剪。
以下是一个示例代码,可以记录背景音乐并检测是否存在波峰削减:
private static final int RECORDER_SAMPLERATE = 44100;
private static final int RECORDER_CHANNELS = AudioFormat.CHANNEL_IN_MONO;
private static final int RECORDER_AUDIO_ENCODING = AudioFormat.ENCODING_PCM_16BIT;
private int bufferSize = AudioRecord.getMinBufferSize(RECORDER_SAMPLERATE, RECORDER_CHANNELS, RECORDER_AUDIO_ENCODING);
private AudioRecord audioRecord;
private boolean isRecording = false;
private short[] audioData;
private void startRecording() {
audioRecord = new AudioRecord(MediaRecorder.AudioSource.MIC, RECORDER_SAMPLERATE, RECORDER_CHANNELS, RECORDER_AUDIO_ENCODING, bufferSize);
isRecording = true;
audioData = new short[bufferSize/2];
audioRecord.startRecording();
while (isRecording) {
audioRecord.read(audioData, 0, audioData.length);
int maxAmplitude = getMaxAmplitude(audioData);
if (maxAmplitude>32767){
// 削减波峰
}else{
// 继续录制
}
}
}
private void stopRecording() {
isRecording = false;
if (audioRecord != null) {
audioRecord.stop();
audioRecord.release();
audioRecord = null;
}
}
// 获取当前录制的音频中的最大振幅
private int getMaxAmplitude(short[] audioData) {
int maxAmplitude = 0;
for (int i=0;imaxAmplitude){
maxAmplitude = Math.abs(audioData[i]);
}
}
return maxAmplitude;
}