c# pcm

using System; using System.IO; using System.Text; using System.Windows.Forms; using System.Runtime.InteropServices; namespace WindowsFormsApplication2 { public partial class Form2 : Form { /// <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類資源文件頭部 4byte*/
            public uint file_len;                /*文件長度4byte*/
            public byte[] wave;                  /*"WAVE"標誌4byte*/
            public byte[] fmt;                   /*"fmt"標誌4byte*/
            public uint NI1;                     /*過渡字節4byte*/
            public ushort format_type;           /*格式類別(10H爲PCM形式的聲音數據)2byte*/
            public ushort Channels;              /*Channels 1 = 單聲道; 2 = 立體聲2byte*/
            public uint frequency;               /*採樣頻率4byte*/
            public uint trans_speed;             /*音頻數據傳送速率4byte*/
            public ushort dataBlock;             /*數據塊的調整數（按字節算的）2byte*/
            public ushort sample_bits;           /*樣本的數據位數(8/16) 2byte*/
            public byte[] data;                  /*數據標記符"data" 4byte*/
            public uint wav_len;                 /*語音數據的長度 4byte*/ } private HeaderType wavHander;       //定義一個頭結構體
        private byte[] buff = new byte[44]; //header byte
        private byte[] databuff;            //data byte
        public Form2() { InitializeComponent(); InitialStruct(); } /// <summary>
        /// 初始化結構體中的數組長度，分配內存 /// </summary>
        private void InitialStruct() { wavHander.riff = new byte[4];//RIFF
            wavHander.wave = new byte[4];//WAVE
            wavHander.fmt = new byte[4];//fmt 
            wavHander.data = new byte[4];//data
 } /// <summary>
        /// 讀取PCM中數據， /// </summary>
        /// <param name="filepath">文件路徑</param>
        /// <returns>讀取成功返回真</returns>
        private bool readPcm(string filepath) { String fileName = filepath;//臨時保存文件名
            if (File.Exists(fileName) == false)//文件不存在
 { throw new Exception(ERRFILENOTEXITS); } //自讀方式打開
            FileStream file = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.None); if (file == null)//打開成功
 { file.Close();//關閉文件
                throw new Exception(ERRFILEISNOTWAVE); } int filelen = (int)file.Length;//獲取文件長度
            databuff = new byte[filelen + 44];//分配 內存
            file.Read(databuff, 44, filelen);//讀取文件，保存在內存中
            file.Close();//關閉文件
            return true; } /// <summary>
        /// 爲PCM文件構建文件頭，準備轉換爲WAV文件 /// </summary>
        /// <returns>構建成功返回真</returns>
        private bool InitHeader() { wavHander.riff = Encoding.ASCII.GetBytes("RIFF");   /*RIFF類資源文件頭部 4byte*/ wavHander.file_len = (uint)(databuff.Length);              /*文件長度4byte*/ wavHander.wave = Encoding.ASCII.GetBytes("WAVE");     /*"WAVE"標誌4byte*/ wavHander.fmt = Encoding.ASCII.GetBytes("fmt ");      /*"fmt"標誌4byte*/ wavHander.NI1 = 0x10;                               /*過渡字節4byte*/ wavHander.format_type = 0x01;                       /*格式類別(10H爲PCM形式的聲音數據)2byte*/ wavHander.Channels = 0x01;                          /*Channels 1 = 單聲道; 2 = 立體聲2byte*/ wavHander.frequency = 0x1F40;                       /*採樣頻率4byte*/ wavHander.trans_speed = 0x3E80;                     /*音頻數據傳送速率4byte*/ wavHander.dataBlock = 0x02;                         /*數據塊的調整數（按字節算的）2byte*/ wavHander.sample_bits = 0x10;                       /*樣本的數據位數(8/16) 2byte*/ wavHander.data = Encoding.ASCII.GetBytes("data");   /*數據標記符"data" 4byte*/ wavHander.wav_len = (uint)(databuff.Length - 44);                /*語音數據的長度 4byte*/
            byte[] byt2;//臨時變量 ，保存2位的整數
            byte[] byt4;//臨時變量， 保存4位的整數
            Encoding.ASCII.GetBytes(Encoding.ASCII.GetString(wavHander.riff), 0, 4, databuff, 0);/*RIFF類資源文件頭部 4byte*/ byt4 = BitConverter.GetBytes(wavHander.file_len); /*文件長度4byte*/ Array.Copy(byt4, 0, databuff, 4, 4); Encoding.ASCII.GetBytes(Encoding.ASCII.GetString(wavHander.wave), 0, 4, databuff, 8);/*"WAVE"標誌4byte*/ Encoding.ASCII.GetBytes(Encoding.ASCII.GetString(wavHander.fmt), 0, 4, databuff, 12);/*"fmt"標誌4byte*/ byt4 = BitConverter.GetBytes(wavHander.NI1);/*過渡字節4byte*/ Array.Copy(byt4, 0, databuff, 16, 4); byt2 = BitConverter.GetBytes(wavHander.format_type);/*格式類別(10H爲PCM形式的聲音數據)2byte*/ Array.Copy(byt2, 0, databuff, 20, 2); byt2 = BitConverter.GetBytes(wavHander.Channels);/*Channels 1 = 單聲道; 2 = 立體聲2byte*/ Array.Copy(byt2, 0, databuff, 22, 2); byt4 = BitConverter.GetBytes(wavHander.frequency);/*採樣頻率4byte*/ Array.Copy(byt4, 0, databuff, 24, 4); byt4 = BitConverter.GetBytes(wavHander.trans_speed);/*音頻數據傳送速率4byte*/ Array.Copy(byt4, 0, databuff, 28, 4); byt2 = BitConverter.GetBytes(wavHander.dataBlock);/*數據塊的調整數（按字節算的）2byte*/ Array.Copy(byt2, 0, databuff, 32, 2); byt2 = BitConverter.GetBytes(wavHander.sample_bits);/*樣本的數據位數(8/16) 2byte*/ Array.Copy(byt2, 0, databuff, 34, 2); Encoding.ASCII.GetBytes(Encoding.ASCII.GetString(wavHander.data), 0, 4, databuff, 36);/*數據標記符"data" 4byte*/ byt4 = BitConverter.GetBytes(wavHander.wav_len); /*語音數據的長度 4byte*/ Array.Copy(byt4, 0, databuff, 40, 4); return true; } /// <summary>
        /// 讀取WAVE文件，包括文件頭和數據部分 /// </summary>
        /// <param name="filepath">文件路徑</param>
        /// <returns>讀取成功返回真</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); } //只讀方式打開文件
            FileStream file = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.None); if (file == null || file.Length < 44) //長度少於44，或者打開失敗
 { file.Close();//                 throw new Exception(ERRFILEISNOTWAVE); } file.Read(buff, 0, 44);//讀取文件頭
            if (fixedData(buff) == false)//按位置保存文件頭信息到結構體中
                throw new Exception(ERRFILEISNOTWAVE); databuff = new byte[wavHander.wav_len];//分配內存
            try { file.Read(databuff, 0, databuff.Length);//讀取文件數據去數據
                return true; } catch { return false; } finally { file.Close();//關閉文件
 } } /// <summary>
        /// 把文件頭數組信息保存到結構體中 /// </summary>
        /// <param name="pbuff">文件頭數組</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")//肯定文件是WAVA類型
                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>
        /// 獲取待轉換的文件名 /button1 && button3 /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button1_Click(object sender, EventArgs e) { txtWav2Pcm_pcm.Text = getOpenFileName("WAV"); } /// <summary>
        /// 打開對話框，獲取被打開的文件路徑 /// </summary>
        /// <param name="type">WAV && PCM</param>
        /// <returns>文件名</returns>
        private string getOpenFileName(string type) { openFileDialog1.InitialDirectory = "c://";//初始路徑
            openFileDialog1.Title = "";//初始文件名爲空
            if (type == "WAV")//WAV文件被打開
                openFileDialog1.Filter = "all file|*.*|wav|*.wav"; else openFileDialog1.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://";//初始路徑
            saveFileDialog1.Title = "";//初始文件名
            if (type == "WAV")//WAV文件被保存
                saveFileDialog1.Filter = "all file|*.*|wav|*.wav"; else saveFileDialog1.Filter = "all file|*.*|pcm|*.pcm"; saveFileDialog1.FilterIndex = 2; if (saveFileDialog1.ShowDialog() == DialogResult.OK) return saveFileDialog1.FileName; else return ""; } /// <summary>
        /// 獲取文件被保存的名 button2&& button4 /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button2_Click(object sender, EventArgs e) { txtPcm2Wav_wav.Text = getSaveFileName("PCM"); } /// <summary>
        /// wav->pcm /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnWav2Pcm_Click(object sender, EventArgs e) { } /// <summary>
        /// 寫文件操做 /// </summary>
        /// <param name="filename">文件路徑</param>
        /// <param name="pbuff">文件數據</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) { } private void button5_Click(object sender, EventArgs e) { if (readWav(txtWav2Pcm_pcm.Text.Trim()) == true) { WriteFile(txtPcm2Wav_wav.Text.Trim(), databuff); lstMessage.Items.Add("PCM文件轉換成功！" + System.DateTime.Now.ToString()); } } private void button3_Click(object sender, EventArgs e) { try { if (readPcm(textBox1.Text) && InitHeader()) { WriteFile(textBox2.Text, databuff); lstMessage.Items.Add("WAVA文件轉換成功！" + System.DateTime.Now.ToString()); } } catch (Exception ex) { lstMessage.Items.Add(ex.Message); } } private void button6_Click(object sender, EventArgs e) { textBox1.Text = getOpenFileName("PCM"); } private void button4_Click(object sender, EventArgs e) { textBox2.Text = getSaveFileName("WAV"); } } }