在NAudio WaveFileWriter类中,我实现了这个方法。
public static void CreateWaveFile(Stream waveMemoryStream, WaveStream stream)
{
using (WaveFileWriter writer =
new WaveFileWriter(waveMemoryStream, stream.WaveFormat))
{
byte[] buffer = new byte[stream.WaveFormat.SampleRate * stream.WaveFormat.Channels * 16];
while (true)
{
int bytesRead = stream.Read(buffer, 0, buffer.Length);
if (bytesRead == 0)
break;
writer.WriteData(buffer, 0, bytesRead);
}
}
}
// --------------------------------------------- -------------------------------------------------- ------------------------------
在我的appplication里面我有这个代码
public void TrimWavFile(string inPath, MemoryStream outPath, TimeSpan cutFromStart, TimeSpan cutFromEnd)
{
using (Mp3FileReader mp3reader = new Mp3FileReader(inPath))
{
WaveStream stream = WaveFormatConversionStream.CreatePcmStream(mp3reader);
WaveFormat format = stream.WaveFormat;
MemoryStream waveStream = new MemoryStream();
WaveFileWriter.CreateWaveFile(waveStream, stream);
Stream rawStream = new MemoryStream(waveStream.ToArray());
using (WaveFileReader reader = new WaveFileReader(rawStream))
{
using (WaveFileWriter writer = new WaveFileWriter(outPath, reader.WaveFormat))
{
int bytesPerMillisecond = reader.WaveFormat.AverageBytesPerSecond / 1000;
int startPos = (int)cutFromStart.TotalMilliseconds * bytesPerMillisecond;
startPos = startPos - startPos % reader.WaveFormat.BlockAlign;
int endBytes = (int)cutFromEnd.TotalMilliseconds * bytesPerMillisecond;
endBytes = endBytes - endBytes % reader.WaveFormat.BlockAlign;
int endPos = (int)reader.Length - endBytes; TrimWavFile(reader, writer, startPos, endPos);
}
}
}
}
private void TrimWavFile(WaveFileReader reader, WaveFileWriter writer, int startPos, int endPos)
{
reader.Position = startPos;
byte[] buffer = new byte[1024];
while (reader.Position < endPos)
{
int bytesRequired = (int)(endPos - reader.Position);
if (bytesRequired > 0)
{
int bytesToRead = Math.Min(bytesRequired, buffer.Length);
int bytesRead = reader.Read(buffer, 0, bytesToRead);
if (bytesRead > 0)
{
writer.WriteData(buffer, 0, bytesRead);
}
}
}
}
private void button5_Click(object sender, EventArgs e)
{
TimeSpan start = new TimeSpan(0, 3, 0);
TimeSpan end = new TimeSpan(0, 2, 0);
MemoryStream temp = new MemoryStream();
TrimWavFile(filename, temp, start, end);
Stream rawStream = new MemoryStream(temp.ToArray());
RawSourceWaveStream rawSourceStream = new RawSourceWaveStream(rawStream,new WaveFormat());
WaveStream wavestream = rawSourceStream;
WaveStream stream = WaveFormatConversionStream.CreatePcmStream(new WaveFileReader(wavestream));
waveOut.Init(stream);
waveOut.Play();
}
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当我点击按钮时,我想读取一个MP3文件,将其转换为波形文件,将转换后的波形文件存储到内存流中,
拆分已转换的波形文件,然后播放波形文件,并将其保存到我的Hardrive中。