wave和pcm互转"/>
wave和pcm互转
2019独角兽企业重金招聘Python工程师标准>>>
wav->pcm pcm->wav c#代码：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;namespace wavtopcm
{public partial class Form1 : Form{public Form1(){InitializeComponent();InitialStruct();}/// <summary>/// ERROR MESSAGE/// </summary>const string ERRFILENOTEXITS = "File is Not Exits.";const string ERRFILEISNOTWAVE = "File is not Wava.";/// <summary>/// Wave Hander information/// </summary>struct HeaderType{public byte[] riff; /*RIFF类资源文件头部 4byte*/public uint file_len; /*文件长度4byte*/public byte[] wave; /*"WAVE"标志4byte*/public byte[] fmt; /*"fmt"标志4byte*/public uint NI1; /*过渡字节4byte*/public ushort format_type; /*格式类别(10H为PCM形式的声音数据)2byte*/public ushort Channels; /*Channels 1 = 单声道; 2 = 立体声2byte*/public uint frequency; /*采样频率4byte*/public uint trans_speed; /*音频数据传送速率4byte*/public ushort dataBlock; /*数据块的调整数（按字节算的）2byte*/public ushort sample_bits; /*样本的数据位数(8/16) 2byte*/public byte[] data; /*数据标记符"data" 4byte*/public uint wav_len; /*语音数据的长度 4byte*/}private HeaderType wavHander; //定义一个头结构体private byte[] buff = new byte[44]; //header byteprivate byte[] databuff; //data byte/// <summary>/// 初始化结构体中的数组长度，分配内存/// </summary>private void InitialStruct(){wavHander.riff = new byte[4];//RIFFwavHander.wave = new byte[4];//WAVEwavHander.fmt = new byte[4];//fmt wavHander.data = new byte[4];//data}/// <summary>/// 读取PCM中数据，/// </summary>/// <param name="filepath">文件路径</param>/// <returns>读取成功返回真</returns>private bool readPcm(string filepath){String fileName = filepath;//临时保存文件名if (File.Exists(fileName) == false)//文件不存在{throw new Exception(ERRFILENOTEXITS);}//自读方式打开FileStream file = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.None);if (file == null)//打开成功{file.Close();//关闭文件throw new Exception(ERRFILEISNOTWAVE);}int filelen =(int) file.Length;//获取文件长度databuff = new byte[filelen+44];//分配 内存file.Read(databuff, 44, filelen);//读取文件，保存在内存中file.Close();//关闭文件return true;}/// <summary>/// 为PCM文件构建文件头，准备转换为WAV文件/// </summary>/// <returns>构建成功返回真</returns>private bool InitHeader(){wavHander.riff = Encoding.ASCII.GetBytes("RIFF"); /*RIFF类资源文件头部 4byte*/wavHander.file_len=(uint) (databuff.Length); /*文件长度4byte*/ wavHander.wave=Encoding.ASCII.GetBytes("WAVE"); /*"WAVE"标志4byte*/ wavHander.fmt=Encoding.ASCII.GetBytes("fmt "); /*"fmt"标志4byte*/wavHander.NI1 =0x10; /*过渡字节4byte*/wavHander.format_type = 0x01; /*格式类别(10H为PCM形式的声音数据)2byte*/wavHander.Channels = 0x01; /*Channels 1 = 单声道; 2 = 立体声2byte*/wavHander.frequency = 0x1F40; /*采样频率4byte*/wavHander.trans_speed = 0x3E80; /*音频数据传送速率4byte*/wavHander.dataBlock = 0x02; /*数据块的调整数（按字节算的）2byte*/wavHander.sample_bits = 0x10; /*样本的数据位数(8/16) 2byte*/wavHander.data = Encoding.ASCII.GetBytes("data"); /*数据标记符"data" 4byte*/wavHander.wav_len =(uint) (databuff.Length-44); /*语音数据的长度 4byte*/byte[] byt2;//临时变量 ，保存2位的整数byte[] byt4;//临时变量， 保存4位的整数Encoding.ASCII.GetBytes(Encoding.ASCII.GetString(wavHander.riff),0,4,databuff,0);/*RIFF类资源文件头部 4byte*/byt4 = BitConverter.GetBytes(wavHander.file_len); /*文件长度4byte*/ Array.Copy(byt4, 0, databuff, 4, 4);Encoding.ASCII.GetBytes(Encoding.ASCII.GetString(wavHander.wave), 0, 4, databuff, 8);/*"WAVE"标志4byte*/Encoding.ASCII.GetBytes(Encoding.ASCII.GetString(wavHander.fmt), 0, 4, databuff, 12);/*"fmt"标志4byte*/byt4 = BitConverter.GetBytes(wavHander.NI1);/*过渡字节4byte*/Array.Copy(byt4, 0, databuff,16,4);byt2 = BitConverter.GetBytes(wavHander.format_type);/*格式类别(10H为PCM形式的声音数据)2byte*/Array.Copy(byt2, 0, databuff, 20,2);byt2 = BitConverter.GetBytes(wavHander.Channels);/*Channels 1 = 单声道; 2 = 立体声2byte*/Array.Copy(byt2, 0, databuff, 22, 2);byt4 = BitConverter.GetBytes(wavHander.frequency);/*采样频率4byte*/Array.Copy(byt4, 0, databuff, 24, 4);byt4 = BitConverter.GetBytes(wavHander.trans_speed);/*音频数据传送速率4byte*/Array.Copy(byt4, 0, databuff, 28, 4);byt2 = BitConverter.GetBytes(wavHander.dataBlock);/*数据块的调整数（按字节算的）2byte*/Array.Copy(byt2, 0, databuff, 32, 2);byt2 = BitConverter.GetBytes(wavHander.sample_bits);/*样本的数据位数(8/16) 2byte*/Array.Copy(byt2, 0, databuff, 34, 2);Encoding.ASCII.GetBytes(Encoding.ASCII.GetString(wavHander.data), 0, 4, databuff, 36);/*数据标记符"data" 4byte*/byt4 = BitConverter.GetBytes(wavHander.wav_len); /*语音数据的长度 4byte*/Array.Copy(byt4, 0, databuff, 40, 4);return true;}/// <summary>/// 读取WAVE文件，包括文件头和数据部分/// </summary>/// <param name="filepath">文件路径</param>/// <returns>读取成功返回真</returns>private bool readWav(string filepath){String fileName = filepath;//保存文件名if (File.Exists(fileName)==false)//文件不存在{throw new Exception(ERRFILENOTEXITS);}//只读方式打开文件FileStream file = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.None);if ( file==null || file.Length<44) //长度少于44，或者打开失败{file.Close();//throw new Exception(ERRFILEISNOTWAVE);}file.Read(buff, 0, 44);//读取文件头if (fixedData(buff) == false)//按位置保存文件头信息到结构体中throw new Exception(ERRFILEISNOTWAVE);databuff=new byte[wavHander.wav_len];//分配内存try{file.Read(databuff, 0, databuff.Length);//读取文件数据去数据return true; }catch{return false;}finally{file.Close();//关闭文件}}/// <summary>/// 把文件头数组信息保存到结构体中/// </summary>/// <param name="pbuff">文件头数组</param>/// <returns>保存成功返回真</returns>bool fixedData ( byte[] pbuff) {Array.Copy(pbuff,0,wavHander.riff,0,4) ;//if (Encoding.ASCII.GetString(wavHander.riff) != "RIFF")//确定文件是WAVA类型return false;wavHander.file_len=BitConverter.ToUInt32(pbuff,4);Array.Copy(pbuff,8,wavHander.wave,0,4) ;Array.Copy(pbuff,12,wavHander.fmt,0,4) ;wavHander.NI1 = BitConverter.ToUInt32(pbuff, 16);wavHander.format_type=BitConverter.ToUInt16(pbuff,20);wavHander.Channels=BitConverter.ToUInt16(pbuff,22);wavHander.frequency=BitConverter.ToUInt32(pbuff,24);wavHander.trans_speed=BitConverter.ToUInt32(pbuff,28);wavHander.dataBlock=BitConverter.ToUInt16(pbuff,32);wavHander.sample_bits=BitConverter.ToUInt16(pbuff,34);Array.Copy(pbuff,36,wavHander.data,0,4);wavHander.wav_len=BitConverter.ToUInt32(pbuff,40);return true;}/// <summary>/// 获取待转换的文件名 /button1 && button3/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void button1_Click(object sender, EventArgs e){Button b = (Button)sender;if (b.Name == "button1") txtWav2Pcm_wav.Text = getOpenFileName("WAV");else txtPcm2Wav_pcm.Text = getOpenFileName("PCM");}/// <summary>/// 打开对话框，获取被打开的文件路径/// </summary>/// <param name="type">WAV && PCM</param>/// <returns>文件名</returns>private string getOpenFileName(string type){openFileDialog1.InitialDirectory = "c://";//初始路径openFileDialog1.Title = "";//初始文件名为空if (type == "WAV")//WAV文件被打开openFileDialog1.Filter = "all file|*.*|wav|*.wav";elseopenFileDialog1.Filter = "all file|*.*|pcm|*.pcm";openFileDialog1.FilterIndex = 2;if (openFileDialog1.ShowDialog() == DialogResult.OK) return openFileDialog1.FileName;else return "";}private string getSaveFileName(string type){saveFileDialog1.InitialDirectory = "c://";//初始路径saveFileDialog1.Title = "";//初始文件名if (type == "WAV")//WAV文件被保存saveFileDialog1.Filter = "all file|*.*|wav|*.wav";elsesaveFileDialog1.Filter = "all file|*.*|pcm|*.pcm";saveFileDialog1.FilterIndex = 2;if (saveFileDialog1.ShowDialog() == DialogResult.OK) return saveFileDialog1.FileName;else return "";}/// <summary>/// 获取文件被保存的名 button2&& button4/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void button2_Click(object sender, EventArgs e){Button b = (Button)sender;if (b.Name == "button2") txtWav2Pcm_pcm.Text = getSaveFileName("PCM");else txtPcm2Wav_wav.Text = getSaveFileName("WAV");}/// <summary>/// wav->pcm/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void btnWav2Pcm_Click(object sender, EventArgs e){try{if (readWav(txtWav2Pcm_wav.Text) == true){WriteFile(txtWav2Pcm_pcm.Text, databuff);lstMessage.Items.Add("PCM文件转换成功！" + System.DateTime.Now.ToString());}}catch(Exception ex){lstMessage.Items.Add(ex.Message);}}/// <summary>/// 写文件操作/// </summary>/// <param name="filename">文件路径</param>/// <param name="pbuff">文件数据</param>private void WriteFile(string filename,byte[] pbuff){if (File.Exists(filename) == true)File.Delete(filename);FileStream sw=File.OpenWrite(filename);if (pbuff != null && sw != null){sw.Write(pbuff, 0, pbuff.Length);sw.Close();}}/// <summary>/// pcm->wav/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void btnPcm2Wav_Click(object sender, EventArgs e){try{if (readPcm(txtPcm2Wav_pcm.Text) && InitHeader()){WriteFile(txtPcm2Wav_wav.Text, databuff);lstMessage.Items.Add("WAVA文件转换成功！" + System.DateTime.Now.ToString());}}catch (Exception ex){lstMessage.Items.Add(ex.Message);}}}
}
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