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unity c# 录音并保存为 mp3 或 wav 文件
private int Frequency = 16000; //录音频率
private int BitRate = 16; //比特率
private int MicSecond = 2; //每隔2秒,保存一下录音数据
public Button bStart;
public Button bStop;
public Button bPlay;
public Text tTip;
public AudioSource au;
void Start () {
bStart.onClick.AddListener(OnStartClick);
bStop.onClick.AddListener(OnStopClick);
bPlay.onClick.AddListener(OnPlayClick);
}
void OnStartClick()
{
tTip.text += "
开始录音....";
au.Stop();
au.loop = false;
au.mute = true;
au.clip = Microphone.Start(null, true, MicSecond, Frequency);
}
void OnStopClick()
{
tTip.text += "
停止录音!";
if (!Microphone.IsRecording(null))
return;
Microphone.End(null);
au.Stop();
Mp3FromClip("d:/test.mp3", au.clip); //将录音保存为mp3
//WavFromClip("d:/test.wav", au.clip); //将录音保存为wav
}
void OnPlayClick()
{
if (Microphone.IsRecording(null))
return;
if (au.clip == null)
return;
au.mute = false;
au.loop = false;
au.Play();
tTip.text += "
播放录音....";
}
public void WavFromClip(string WavPosition, AudioClip clip)
{
if (Microphone.IsRecording(null))
return;
Microphone.End(null);
using (FileStream fs = CreateEmpty(WavPosition))
{
ConvertAndWrite(fs, au.clip);
WriteHeader(fs, au.clip); //wav文件头
}
}
private FileStream CreateEmpty(string filepath)
{
FileStream fileStream = new FileStream(filepath, FileMode.Create);
byte emptyByte = new byte();
for (int i = 0; i < 44; i++) //为wav文件头留出空间
{
fileStream.WriteByte(emptyByte);
}
return fileStream;
}
private void ConvertAndWrite(FileStream fileStream, AudioClip clip)
{
float[] samples = new float[clip.samples];
clip.GetData(samples, 0);
Int16[] intData = new Int16[samples.Length];
Byte[] bytesData = new Byte[samples.Length * 2];
int rescaleFactor = 32767; //to convert float to Int16
for (int i = 0; i < samples.Length; i++)
{
intData[i] = (short)(samples[i] * rescaleFactor);
Byte[] byteArr = new Byte[2];
byteArr = BitConverter.GetBytes(intData[i]);
byteArr.CopyTo(bytesData, i * 2);
}
fileStream.Write(bytesData, 0, bytesData.Length);
}
public void Mp3FromClip(string Mp3location, AudioClip clip)
{
var samples = new float[clip.samples * clip.channels];
clip.GetData(samples, 0);
Int16[] intData = new Int16[samples.Length];
//converting in 2 float[] steps to Int16[], //then Int16[] to Byte[]
Byte[] bytesData = new Byte[samples.Length * 2];
//bytesData array is twice the size of
//dataSource array because a float converted in Int16 is 2 bytes.
float rescaleFactor = 32767; //to convert float to Int16
for (int i = 0; i < samples.Length; i++)
{
intData[i] = (short)(samples[i] * rescaleFactor);
Byte[] byteArr = new Byte[2];
byteArr = BitConverter.GetBytes(intData[i]);
byteArr.CopyTo(bytesData, i * 2);
}
var ms = new MemoryStream(bytesData);
using (var writer = new LameMP3FileWriter(Mp3location, new WaveFormat(Frequency, BitRate, 1), LAMEPreset.ABR_16))
ms.CopyTo(writer);
}
private void WriteHeader(FileStream stream, AudioClip clip)
{
int hz = clip.frequency;
int channels = clip.channels;
int samples = clip.samples;
stream.Seek(0, SeekOrigin.Begin);
Byte[] riff = System.Text.Encoding.UTF8.GetBytes("RIFF");
stream.Write(riff, 0, 4);
Byte[] chunkSize = BitConverter.GetBytes(stream.Length - 8);
stream.Write(chunkSize, 0, 4);
Byte[] wave = System.Text.Encoding.UTF8.GetBytes("WAVE");
stream.Write(wave, 0, 4);
Byte[] fmt = System.Text.Encoding.UTF8.GetBytes("fmt ");
stream.Write(fmt, 0, 4);
Byte[] subChunk1 = BitConverter.GetBytes(16);
stream.Write(subChunk1, 0, 4);
UInt16 two = 2;
UInt16 one = 1;
Byte[] audioFormat = BitConverter.GetBytes(one);
stream.Write(audioFormat, 0, 2);
Byte[] numChannels = BitConverter.GetBytes(channels);
stream.Write(numChannels, 0, 2);
Byte[] sampleRate = BitConverter.GetBytes(hz);
stream.Write(sampleRate, 0, 4);
Byte[] byteRate = BitConverter.GetBytes(hz * channels * 2); // sampleRate * bytesPerSample*number of channels, here 44100*2*2
stream.Write(byteRate, 0, 4);
UInt16 blockAlign = (ushort)(channels * 2);
stream.Write(BitConverter.GetBytes(blockAlign), 0, 2);
UInt16 bps = 16;
Byte[] bitsPerSample = BitConverter.GetBytes(bps);
stream.Write(bitsPerSample, 0, 2);
Byte[] datastring = System.Text.Encoding.UTF8.GetBytes("data");
stream.Write(datastring, 0, 4);
Byte[] subChunk2 = BitConverter.GetBytes(samples * channels * 2);
stream.Write(subChunk2, 0, 4);
}