怎么样才能在网上卖东西,抖音seo代理,seo实战培训费用,使用wordpress的购物网站文章目录 前言一、如何实现#xff1f;1.定义头结构2.预留头部空间3.写入PCM数据4.写入头部信息 二、完整代码三、使用示例总结 前言
之前实现了《C 将音频PCM数据封装成wav文件》#xff0c;最近将其改成了C#版本。使用C#实现录音功能时还是需要写wav文件的#xff0c;直接… 文章目录 前言一、如何实现1.定义头结构2.预留头部空间3.写入PCM数据4.写入头部信息 二、完整代码三、使用示例总结 前言
之前实现了《C 将音频PCM数据封装成wav文件》最近将其改成了C#版本。使用C#实现录音功能时还是需要写wav文件的直接用C#实现也是比较简单的这样可以免去不必要的依赖。 一、如何实现
首先需要构造wav头部wav文件音频信息全部保存在头部我们要做的就是在PCM数据的前面加入wav头并且记录PCM的相关参数。
1.定义头结构
只定义PCM格式的wav文件头包含3部分riff、format、data。需要使用[StructLayout(LayoutKind.Sequential)]描述结构体确保内存连续。 WAV头部
//WAV头部结构-PCM格式
[StructLayout(LayoutKind.Sequential)]
struct WavPCMFileHeader
{RIFF riffnew RIFF();Format format new Format();Data data new Data();public WavPCMFileHeader() { }
}RTTF部分
[StructLayout(LayoutKind.Sequential)]
struct RIFF
{byte r (byte)R;byte i (byte)I;byte f (byte)F;byte t (byte)F;public uint fileLength 0;byte w (byte)W;byte a (byte)A;byte v (byte)V;byte e (byte)E;public RIFF() { }
}Format部分
[StructLayout(LayoutKind.Sequential)]
struct Format
{byte f (byte)f;byte m (byte)m;byte t (byte)t;byte s (byte) ;public uint blockSize 16;public ushort formatTag0;public ushort channels 0;public uint samplesPerSec 0;public uint avgBytesPerSec 0;public ushort blockAlign 0;public ushort bitsPerSample 0;public Format() { }
}Data部分
[StructLayout(LayoutKind.Sequential)]
struct Data
{byte d (byte)d;byte a (byte)a;byte t (byte)t;byte a2 (byte)a;public uint dataLength0;public Data() { }
}2.预留头部空间
创建文件时预留头部空间
_stream File.Open(fileName, FileMode.Create);
_stream!.Seek(Marshal.SizeOfWavPCMFileHeader(), SeekOrigin.Begin);3.写入PCM数据
写入数据
_stream!.Write(data);4.写入头部信息
关闭文件时回到起始位置写入头部信息
//写入头部信息
_stream!.Seek(0, SeekOrigin.Begin);
WavPCMFileHeader h new WavPCMFileHeader(_channels, _sampleRate, _bitsPerSample, (uint)(_stream.Length - Marshal.SizeOfWavPCMFileHeader()));
_stream!.Write(StructToBytes(h));
_stream!.Close();
_stream null;二、完整代码
.net6.0 WavWriter.cs
using System.Runtime.InteropServices;
/************************************************************************
* Project: AC::WavWriter
* Decription: wav文件写入工具
* Verision: v1.0.0.0
* Author: Xin Nie
* Create: 2023/10/8 09:27:00
* LastUpdate: 2023/10/8 18:28:00
************************************************************************
* Copyright 2025. All rights reserved.
************************************************************************/
namespace AC
{ /// summary/// wav写入工具目前只支持pcm格式/// /summarypublic class WavWriter:IDisposable{ushort _channels;uint _sampleRate;ushort _bitsPerSample;FileStream? _stream;/// summary/// 创建对象/// /summary/// param namefileName文件名/param/// param namechannels声道数/param/// param namesampleRate采样率单位hz/param/// param namebitsPerSample位深/parampublic static WavWriter Create(string fileName, ushort channels, uint sampleRate, ushort bitsPerSample){return new WavWriter(fileName, channels, sampleRate, bitsPerSample); }/// summary/// 构造方法/// /summary/// param namefileName文件名/param/// param namechannels声道数/param/// param namesampleRate采样率单位hz/param/// param namebitsPerSample位深/paramWavWriter(string fileName, ushort channels, uint sampleRate, ushort bitsPerSample){_stream File.Open(fileName, FileMode.Create);_channels channels;_sampleRate sampleRate;_bitsPerSample bitsPerSample;_stream!.Seek(Marshal.SizeOfWavPCMFileHeader(), SeekOrigin.Begin);}/// summary/// 写入PCM数据/// /summary/// param namedataPCM数据/parampublic void Write(byte[] data){_stream!.Write(data);}/// summary/// 写入PCM数据/// /summary/// param namestreamPCM数据/parampublic void Write(Stream stream){stream.CopyTo(_stream!);}/// summary/// 关闭文件/// /summarypublic void Close(){//写入头部信息_stream!.Seek(0, SeekOrigin.Begin);WavPCMFileHeader h new WavPCMFileHeader(_channels, _sampleRate, _bitsPerSample, (uint)(_stream.Length - Marshal.SizeOfWavPCMFileHeader()));_stream!.Write(StructToBytes(h));_stream!.Close();_stream null;}public void Dispose(){Close();}static byte[] StructToBytesT(T obj){int size Marshal.SizeOf(typeof(T));IntPtr bufferPtr Marshal.AllocHGlobal(size);try{Marshal.StructureToPtr(obj!, bufferPtr, false);byte[] bytes new byte[size];Marshal.Copy(bufferPtr, bytes, 0, size);return bytes;}catch (Exception ex){throw new Exception(Error in StructToBytes ! ex.Message);}finally{Marshal.FreeHGlobal(bufferPtr);}} }//WAV头部结构-PCM格式[StructLayout(LayoutKind.Sequential)]struct WavPCMFileHeader{[StructLayout(LayoutKind.Sequential)]struct RIFF{byte r (byte)R;byte i (byte)I;byte f (byte)F;byte t (byte)F;public uint fileLength 0;byte w (byte)W;byte a (byte)A;byte v (byte)V;byte e (byte)E;public RIFF() { }}[StructLayout(LayoutKind.Sequential)]struct Format{byte f (byte)f;byte m (byte)m;byte t (byte)t;byte s (byte) ;public uint blockSize 16;public ushort formatTag0;public ushort channels 0;public uint samplesPerSec 0;public uint avgBytesPerSec 0;public ushort blockAlign 0;public ushort bitsPerSample 0;public Format() { }}[StructLayout(LayoutKind.Sequential)]struct Data{byte d (byte)d;byte a (byte)a;byte t (byte)t;byte a2 (byte)a;public uint dataLength0;public Data() { }}RIFF riffnew RIFF();Format format new Format();Data data new Data();public WavPCMFileHeader() { }public WavPCMFileHeader(ushort nCh, uint nSampleRate, ushort bitsPerSample, uint dataSize){riff.fileLength (uint)(36 dataSize);format.formatTag 1;format.channels nCh;format.samplesPerSec nSampleRate;format.avgBytesPerSec nSampleRate * nCh * bitsPerSample / 8;format.blockAlign (ushort)(nCh * bitsPerSample / 8);format.bitsPerSample bitsPerSample;data.dataLength dataSize;}};
}三、使用示例
using AC;
try
{using (var ww WavWriter.Create(test.wav, 2, 44100, 16)){byte[]data;//获取PCM数据//略//获取PCM数据-end//写入PCM数据ww.Write(data);}
}
catch (Exception e)
{Console.WriteLine(e.Message);
}总结
以上就是今天要讲的内容PCM封装成wav还是相对较简单的只要了解wav头结构,然后自定义其头结构然后再进行一定的测试就可以实现这样一个功能。
