Qt模块化笔记之multimedia——实时录音放音的另类实现

今天在网上看些教程时，发现有个实时录音与放音的话题，都在绞尽脑汁地想怎样将声音数据用QAudioInput录入文件，再从文件中用QAudioOutput输出播放，这样，往往出现一些问题。如在写入时是锁着的，只能等着写完关闭后再打开输出，这样就降低效率，造成时间差了，而且经常性打开关闭IO，也对硬盘有些损坏吧？这种一边写入一边读取的IO，是不是和C++中所说的队列相同？那么，哪个IO像队列呢？

我突然间想到，在网络部分的socket是不是很适合？

这样，我写了下面两个测试程序：

录制声音程序主要源码：

#include "dialog.h"
#include "ui_dialog.h"
#include 
#include 
Dialog::Dialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Dialog)
{
    ui->setupUi(this);
    clientSocket=new QTcpSocket;
    //connect(clientSocket,SIGNAL(readyRead()),this,SLOT(readData()));
    clientSocket->connectToHost(QHostAddress::LocalHost,1992);
}
void Dialog::on_pushButton_clicked()
{
    QAudioFormat format;
        // Set up the desired format, for example:
        format.setSampleRate(8000);
        format.setChannelCount(1);
        format.setSampleSize(8);
        format.setCodec("audio/pcm");
        format.setByteOrder(QAudioFormat::LittleEndian);
        format.setSampleType(QAudioFormat::UnSignedInt);

        QAudioDeviceInfo info = QAudioDeviceInfo::defaultInputDevice();
        if (!info.isFormatSupported(format)) {
            qWarning() << "Default format not supported, trying to use the nearest.";
            format = info.nearestFormat(format);
        }
        audio = new QAudioInput(format, this);
        //connect(audio, SIGNAL(stateChanged(QAudio::State)), this, SLOT(handleStateChanged(QAudio::State)));
        audio->start(clientSocket);
}

播放程序主要源码：

#include "dialog.h"
#include "ui_dialog.h"
#include 
#include 
#include 
Dialog::Dialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Dialog)
{
    ui->setupUi(this);
    server= new QTcpServer;
    server->listen(QHostAddress::LocalHost,1992);
    connect(server, SIGNAL(newConnection()), this, SLOT(handlenewConnection()));
    QAudioFormat format;
        // Set up the format, eg.
        format.setSampleRate(8000);
        format.setChannelCount(1);
        format.setSampleSize(8);
        format.setCodec("audio/pcm");
        format.setByteOrder(QAudioFormat::LittleEndian);
        format.setSampleType(QAudioFormat::UnSignedInt);

        QAudioDeviceInfo info(QAudioDeviceInfo::defaultOutputDevice());
        if (!info.isFormatSupported(format)) {
            qWarning() << "Raw audio format not supported by backend, cannot play audio.";
            return;
        }
        audio = new QAudioOutput(format, this);
        //connect(audio, SIGNAL(stateChanged(QAudio::State)), this, SLOT(handleStateChanged(QAudio::State)));
       socket =new QTcpSocket;
}
void Dialog::handlenewConnection()
{
    qWarning("connected");
    socket =server->nextPendingConnection();
    audio->start(socket);
}

我是在笔记本上测试的，敲击话筒时，能在扬声器中听到声音，不过有一定量噪声，应该需要对录制的声音数据先进行降噪处理吧……