基于Qt/C++的音频转换程序，pcm互转wav，位数转换

话不多说，先上程序，上面是文件路径选择, 中间三个功能模块，最下面是个状态显示窗口，替换了cmd小黑窗，用起来相当丝滑

• 直接选择文件夹，写了个文件过滤，可以一键转换文件夹下所有pcm/wav文件

上代码

一、ui设计

脑子里先想好，设计出来的程序大概什么样，然后在Qt的GUI里面设计出来，大概就这样子

二、定义类

ui里设计好模块，再根据模块设计分别实现的类，也可以先手画一下类之间的关系；
我这里刚好是三个类对应三个功能，然后再加一个主界面，感觉也不需要什么菜单栏，状态栏，一个widget就满足我的需求了

三、类实现

pcm2wav.cpp

这里具体实现就是在pcm裸数据，加上一个44字节的wav头
我这里直接搞了一个函数实现，方便其他程序调用pcm2WavFile(QString pathWav,QString pathPcm,const int NumChannels,const int SampleRate,const int BitsPerSample )
记得python里面有个wave的包，直接调用就可以，无奈苦逼c++还得手撸

#include "pcm2wav.h"
#include <iostream>
#include <string.h>
#include <fstream>
#include <QString>
#include <QFileInfo>
#include <QDebug>

using namespace std;
pcm2wav::pcm2wav(QObject *parent) : QObject(parent)
{
    
    

}

//参数：wav文件路径、pcm文件路径、声道数、采样率、位数
void pcm2wav::pcm2WavFile(QString pathWav,QString pathPcm,const int NumChannels,const int SampleRate,const int BitsPerSample )
{
    
           
        // 准备文件
        QFileInfo fi;
        fi = QFileInfo(pathPcm);
        QString fiName = fi.fileName();
        // const int NumChannels = 1; //通道数，
        // const int SampleRate = 16000; //采样率
        // const int BitsPerSample = 24; //每个采样点的bit数，一般为8,16,32等
        QString wavPCM = pathWav+fiName.left(fiName.size()-3)+"wav";//设置wav的文件名
        ifstream pcmIn(qPrintable(pathPcm), ios::in|ios::binary);
        ofstream wavOut(qPrintable(wavPCM),ios::out | ios::binary);
        if(!wavOut.is_open())
        {
    
    
            cout<<"open wavfile erro"<<endl;
            return ;
        }
        if(!pcmIn.is_open())
        {
    
    
            cout<<"open pcmfile erro"<<endl;
            return ;
        }

        WAVE_HEADER pcmHEADER;
        WAVE_FMT    pcmFMT;
        WAVE_DATA   pcmDATA;

         // 1. /* WAVE_HEADER */
        //获取文件尺寸
        pcmIn.seekg(0,ios::end);
        unsigned long pcmSize = pcmIn.tellg();
        pcmHEADER.ChunkSize = 36 + pcmSize;

        memcpy(pcmHEADER.ChunkID, "RIFF", strlen("RIFF"));
        memcpy(pcmHEADER.Format, "WAVE", strlen("WAVE"));
        wavOut.write((char*)&pcmHEADER,sizeof(WAVE_HEADER));

        //2.  /* WAVE_FMT */
        memcpy(pcmFMT.Subchunk1ID, "fmt ", strlen("fmt "));
        pcmFMT.Subchunk1Size = 16;
        pcmFMT.AudioFormat = 1;
        pcmFMT.NumChannels = NumChannels;
        pcmFMT.SampleRate = SampleRate;
        pcmFMT.BitsPerSample = BitsPerSample;
        pcmFMT.ByteRate = pcmFMT.SampleRate*pcmFMT.NumChannels*pcmFMT.BitsPerSample/8;
        pcmFMT.BlockAlign = pcmFMT.NumChannels*pcmFMT.BitsPerSample/8;
        wavOut.write((char*)&pcmFMT,sizeof(WAVE_FMT));

        //3. /* WAVE_DATA */
        memcpy(pcmDATA.Subchunk2ID, "data", strlen("data"));
        pcmDATA.Subchunk2Size = pcmSize;
        wavOut.write((char*)&pcmDATA,sizeof(WAVE_DATA));

        //4. //数据拷贝
        char *temp= new char[pcmSize];
        pcmIn.seekg(0,ios::beg);
        pcmIn.read(temp, pcmSize);
        wavOut.write(temp, pcmSize);
        delete temp;
        pcmIn.close();
        wavOut.close();
}

wav2pcm.cpp

直接删掉文件头

#ifndef WAV2PCM_H
#define WAV2PCM_H

#include <QObject>

class wav2pcm : public QObject
{
    
    
    Q_OBJECT
public:
    explicit wav2pcm(QObject *parent = nullptr);
    void wav2pcmFiles(QString pathWav,QString pathPcm,int waveSize);
signals:

public slots:
};

#endif // WAV2PCM_H

audiobitconv.h

#ifndef AUDIOBITCONV_H
#define AUDIOBITCONV_H

#include <QObject>

class audioBitConv : public QObject
{
    
    
    Q_OBJECT
public:
    explicit audioBitConv(QObject *parent = nullptr);

    void bitConverFiles(QString,QString,int,int);
signals:

public slots:
};

#endif // AUDIOBITCONV_H

audiobitconv.cpp

#include "audiobitconv.h"
#include <iostream>
#include <fstream>
#include <vector>
#include <math.h>
#include <QFileInfo>
#define N 44
using namespace std;

audioBitConv::audioBitConv(QObject *parent) : QObject(parent)
{
    
    

}
void audioBitConv::bitConverFiles(QString initBitPcm,QString _converbitpcm,
                                  int initBit,int conveBit)
{
    
    
    QFileInfo fi;
    fi = QFileInfo(initBitPcm);
    QString fiName = fi.fileName();
    QString converBitPcm = _converbitpcm+fiName.left(fiName.size()-4)+QString::number(conveBit)+".pcm";
    //24位PCM转为量化电平读入内存v1
      ifstream bit24PcmIn(qPrintable(initBitPcm),ios::in| ios::binary);
      if(!bit24PcmIn.is_open())
      {
    
    
          cout<<"open 24file erro"<<endl;
          return  ;
      }
      vector<int>v1;
      while (!bit24PcmIn.eof())
      {
    
    
          int temp;
          bit24PcmIn.read((char*)&temp,initBit/8);
          v1.push_back(temp);
      }
      v1.pop_back();
      bit24PcmIn.close();

      // 高位电平转低位，二进制存盘
		.......待续

}

还没写完。。。
需要用，可先下载https://download.csdn.net/download/db1403600882/34039836