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C#获取WAV文件的长度和结构 收藏
时间是根据结构提的DATA的大小/每秒字节数 对于波形以后再帖出把。
using System;
using System.Collections.Generic; using System.Text; using System.IO; namespace CopyDirectoryInfo
{ public class WaveInfo { /// <summary> /// 数据流 /// </summary> private FileStream m_WaveData; private bool m_WaveBool = false; private RIFF_WAVE_Chunk _Header = new RIFF_WAVE_Chunk();
private Format_Chunk _Format = new Format_Chunk(); private Fact_Chunk _Fact = new Fact_Chunk(); private Data_Chunk _Data = new Data_Chunk(); public WaveInfo(string WaveFileName)
{ m_WaveData = new FileStream(WaveFileName, FileMode.Open); try { LoadWave(); m_WaveData.Close(); } catch { m_WaveData.Close(); } } private void LoadWave()
{ #region RIFF_WAVE_Chunk byte[] _Temp4 = new byte[4]; byte[] _Temp2 = new byte[2]; m_WaveData.Read(_Temp4, 0, 4); if (_Temp4[0] != _Header.szRiffID[0] || _Temp4[1] != _Header.szRiffID[1] || _Temp4[2] != _Header.szRiffID[2] || _Temp4[3] != _Header.szRiffID[3]) return; m_WaveData.Read(_Temp4, 0, 4); _Header.dwRiffSize = BitConverter.ToUInt32(_Temp4, 0); m_WaveData.Read(_Temp4, 0, 4); if (_Temp4[0] != _Header.szRiffFormat[0] || _Temp4[1] != _Header.szRiffFormat[1] || _Temp4[2] != _Header.szRiffFormat[2] || _Temp4[3] != _Header.szRiffFormat[3]) return; #endregion #region Format_Chunk
m_WaveData.Read(_Temp4, 0, 4); if (_Temp4[0] != _Format.ID[0] || _Temp4[1] != _Format.ID[1] || _Temp4[2] != _Format.ID[2]) return; m_WaveData.Read(_Temp4, 0, 4); _Format.Size = BitConverter.ToUInt32(_Temp4,0); long _EndWave = _Format.Size + m_WaveData.Position ; m_WaveData.Read(_Temp2, 0, 2); _Format.FormatTag = BitConverter.ToUInt16(_Temp2, 0); m_WaveData.Read(_Temp2, 0, 2); _Format.Channels = BitConverter.ToUInt16(_Temp2, 0); m_WaveData.Read(_Temp4, 0, 4); _Format.SamlesPerSec = BitConverter.ToUInt32(_Temp4, 0); m_WaveData.Read(_Temp4, 0, 4); _Format.AvgBytesPerSec = BitConverter.ToUInt32(_Temp4, 0); m_WaveData.Read(_Temp2, 0, 2); _Format.BlockAlign = BitConverter.ToUInt16(_Temp2, 0); m_WaveData.Read(_Temp2, 0, 2); _Format.BitsPerSample = BitConverter.ToUInt16(_Temp2, 0); m_WaveData.Position += _EndWave - m_WaveData.Position;
#endregion
m_WaveData.Read(_Temp4, 0, 4);
if (_Temp4[0] == _Fact.ID[0] && _Temp4[1] == _Fact.ID[1] && _Temp4[2] == _Fact.ID[2] && _Temp4[3] == _Fact.ID[3])
{ #region Fact_Chunk m_WaveData.Read(_Temp4, 0, 4); _Fact.Size = BitConverter.ToUInt32(_Temp4, 0); m_WaveData.Position += _Fact.Size; #endregion m_WaveData.Read(_Temp4, 0, 4); } if (_Temp4[0] == _Data.ID[0] && _Temp4[1] == _Data.ID[1] && _Temp4[2] == _Data.ID[2] && _Temp4[3] == _Data.ID[3]) { #region Data_Chunk m_WaveData.Read(_Temp4, 0, 4); _Data.Size = BitConverter.ToUInt32(_Temp4, 0); _Data.FileBeginIndex = m_WaveData.Position;
_Data.FileOverIndex = m_WaveData.Position + _Data.Size; m_Second = (double)_Data.Size / (double)_Format.AvgBytesPerSec;
#endregion } m_WaveBool = true;
} #region 文件定义 /// <summary> /// 文件头 /// </summary> private class RIFF_WAVE_Chunk { /// <summary> /// 文件前四个字节 为RIFF /// </summary> public byte[] szRiffID = new byte[] { 0x52,0x49,0x46,0x46}; // 'R','I','F','F' /// <summary> /// 数据大小 这个数字等于+8 =文件大小 /// </summary> public uint dwRiffSize = 0; /// <summary> ///WAVE文件定义 为WAVE /// </summary> public byte[] szRiffFormat = new byte[] { 0x57,0x41,0x56,0x45}; // 'W','A','V','E' } /// <summary> /// 声音内容定义 /// </summary> private class Format_Chunk { /// <summary> /// 固定为 是"fmt "字后一位为0x20 /// </summary> public byte[] ID= new byte[]{0x66,0x6D,0x74,0x20}; /// <summary> /// 区域大小 /// </summary> public uint Size =0; /// <summary> /// 记录着此声音的格式代号，例如1-WAVE_FORMAT_PCM， 2-WAVE_F0RAM_ADPCM等等。 /// </summary> public ushort FormatTag=1; /// <summary> /// 声道数目，1--单声道；2--双声道 /// </summary> public ushort Channels=2; /// <summary> /// 采样频率 一般有11025Hz（11kHz）、22050Hz（22kHz）和44100Hz（44kHz）三种 /// </summary> public uint SamlesPerSec=0; /// <summary> /// 每秒所需字节数 /// </summary> public uint AvgBytesPerSec=0; /// <summary> /// 数据块对齐单位(每个采样需要的字节数) /// </summary> public ushort BlockAlign=0; /// <summary> /// 音频采样大小 /// </summary> public ushort BitsPerSample=0; /// <summary> /// ??? /// </summary> public byte[] Temp = new byte[2]; } /// <summary> /// FACT /// </summary> private class Fact_Chunk { /// <summary> /// 文件前四个字节 为fact /// </summary> public byte[] ID = new byte[] { 0x66, 0x61, 0x63, 0x74 }; // 'f','a','c','t' /// <summary> /// 数据大小 /// </summary> public uint Size = 0; /// <summary> /// 临时数据 /// </summary> public byte[] Temp; } /// <summary> /// 数据区 /// </summary> private class Data_Chunk { /// <summary> /// 文件前四个字节 为RIFF /// </summary> public byte[] ID = new byte[] { 0x64, 0x61, 0x74, 0x61 }; // 'd','a','t','a' /// <summary> /// 大小 /// </summary> public uint Size = 0; /// <summary> /// 开始播放的位置 /// </summary> public long FileBeginIndex = 0; /// <summary> /// 结束播放的位置 /// </summary> public long FileOverIndex = 0; } #endregion #region 属性 /// <summary> /// 是否成功打开文件 /// </summary> public bool WaveBool { get { return m_WaveBool; } } private double m_Second = 0; /// <summary> /// 秒单位 /// </summary> public double Second { get { return m_Second; } } /// <summary> /// 格式 /// </summary> public string FormatTag { get { switch (_Format.FormatTag) { case 1: return "PCM"; case 2: return "Microsoft ADPCM"; default: return "Un"; } } } /// <summary> /// 频道 /// </summary> public ushort Channels {get {return _Format.Channels;}} /// <summary> /// 采样级别 /// </summary> public string SamlesPerSec { get { switch (_Format.SamlesPerSec) { case 11025: return "11kHz"; case 22050: return "22kHz"; case 44100: return "44kHz"; default: return _Format.SamlesPerSec.ToString()+"Hz"; }
} } /// <summary> /// 采样大小 /// </summary> public ushort BitsPerSample{get {return _Format.BitsPerSample;}} #endregion } } 本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/zgke/archive/2008/11/27/3389384.aspx |
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