将short []转换为Stream，可以作为Audio播放

Question

所以我所拥有的是一个short []数组，它表示WAV文件的原始数据。 这意味着它不包含通常包含的任何页眉或页脚信息。 为了播放这个音频，我需要将它转换为某种类型的流，不幸的是，这个short []数组中的数据是Int16，并且许多值超过255，因此无法转换为字节并且无法转换为流。 有谁知道我怎么能播放这个音频数据？

Answer 1

您可以将短数组转换回字节数组：

short[] sampleData = ...
byte[] byteArray = new byte[sampleData.Length*2];
Buffer.BlockCopy(sampleData , 0, byteArray, 0, byteArray.Length);

然后，您可以使用下面的WaveMemoryStream类创建波流 - 为此您需要知道样本数据的波形格式。 然后，该流可以保存为WAV文件或由SoundPlayer 。

public class WaveMemoryStream : Stream
{
    public override bool CanSeek { get { return false; } }
    public override bool CanWrite { get { return false; } }
    public override bool CanRead { get { return true; } }
    public override long Length { get { return _waveStream.Length; } }
    public override long Position { get { return _waveStream.Position; } set { _waveStream.Position = value; } }

    private MemoryStream _waveStream;

    public WaveMemoryStream(byte[] sampleData, int audioSampleRate, ushort audioBitsPerSample, ushort audioChannels)
    {
        _waveStream = new MemoryStream();
        WriteHeader(_waveStream, sampleData.Length, audioSampleRate, audioBitsPerSample, audioChannels);
        WriteSamples(_waveStream, sampleData);
        _waveStream.Position = 0;
    }

    public void WriteHeader(Stream stream, int length, int audioSampleRate, ushort audioBitsPerSample, ushort audioChannels)
    {
        BinaryWriter bw = new BinaryWriter(stream);

        bw.Write(new char[4] { 'R', 'I', 'F', 'F' });
        int fileSize = 36 + length;
        bw.Write(fileSize);
        bw.Write(new char[8] { 'W', 'A', 'V', 'E', 'f', 'm', 't', ' ' });
        bw.Write((int)16);
        bw.Write((short)1);
        bw.Write((short)audioChannels);
        bw.Write(audioSampleRate);
        bw.Write((int)(audioSampleRate * ((audioBitsPerSample * audioChannels) / 8)));
        bw.Write((short)((audioBitsPerSample * audioChannels) / 8));
        bw.Write((short)audioBitsPerSample);

        bw.Write(new char[4] { 'd', 'a', 't', 'a' });
        bw.Write(length);
    }

    public void WriteSamples(Stream stream, byte[] sampleData)
    {
        BinaryWriter bw = new BinaryWriter(stream);
        bw.Write(sampleData, 0, sampleData.Length);
    }

    public override int Read(byte[] buffer, int offset, int count)
    {
        return _waveStream.Read(buffer, offset, count);
    }

    public virtual void WriteTo(Stream stream)
    {
        int bytesRead = 0;
        byte[] buffer = new byte[8192];

        do
        {
            bytesRead = Read(buffer, 0, buffer.Length);
            stream.Write(buffer, 0, bytesRead);
        } while (bytesRead > 0);

        stream.Flush();
    }

    public override void Flush()
    {
        _waveStream.Flush();
    }

    public override long Seek(long offset, SeekOrigin origin)
    {
        return _waveStream.Seek(offset, origin);
    }

    public override void SetLength(long value)
    {
        throw new NotImplementedException();
    }
    public override void Write(byte[] buffer, int offset, int count)
    {
        throw new NotImplementedException();
    }
}