我正在尝试用Qt编写一个程序,该程序同时记录来自麦克风的音频并同时播放。我使用的是Qt 5.9.4,我使用的是Fedora 29(由于我们的生产环境是Fedora 29,因此无法更新至最新版本-无法更新,已经询问了老板)。
我写了一些准系统代码,如下所示。但是每次运行程序时,都会出现以下错误消息:
using null output device, none available
using null input device, none available
我已经安装了每个qt5 *软件包。我也安装了alsa-utils和Pulse音频。
我还研究了这些或多或少对我有所帮助但未能解决我的问题的方法:
我不知道这是与Fedora有关的问题还是与Qt有关的问题。请帮忙!
myaudiorecorder.h:
#ifndef MYAUDIORECORDER_H
#define MYAUDIORECORDER_H
#include <QAudioFormat>
#include <QAudioDeviceInfo>
#include <QTextStream>
#include <QAudioInput>
#include <QAudioOutput>
#include <QObject>
class MyAudioRecorder : public QObject
{
Q_OBJECT
public:
MyAudioRecorder();
QAudioFormat formatIn;
QAudioFormat formatOut;
QAudioInput *m_audioInput;
QAudioOutput *m_audioOutput;
QAudioDeviceInfo m_InputDevice;
QAudioDeviceInfo m_OutputDevice;
QIODevice *m_input;
QIODevice *m_output;
QAudioDeviceInfo deviceIn;
QAudioDeviceInfo deviceOut;
void getFormat();
void createAudioInput();
void createAudioOutput();
void beginAudio();
};
#endif // MYAUDIORECORDER_H
myaudiorecorder.cpp:
#include "myaudiorecorder.h"
MyAudioRecorder::MyAudioRecorder() {
getFormat();
createAudioInput();
createAudioOutput();
}
void MyAudioRecorder::getFormat(){
formatIn.setSampleSize(8);
formatIn.setCodec("audio/pcm");
formatIn.setByteOrder(QAudioFormat::LittleEndian);
formatIn.setSampleType(QAudioFormat::UnSignedInt);
deviceIn = QAudioDeviceInfo::availableDevices(QAudio::AudioInput).at(1);
if(!deviceIn.isFormatSupported(formatIn)){
QTextStream(stdout) << " default formatIn not supported " << endl;
formatIn = deviceIn.nearestFormat(formatIn);
} else {
QTextStream(stdout) << " default formatIn supported " << endl;
}
deviceOut = QAudioDeviceInfo::availableDevices(QAudio::AudioOutput).at(0);
if(!deviceOut.isFormatSupported(formatOut)) {
QTextStream(stdout) << "1. default formatOut not supported " << endl;
formatOut = deviceOut.nearestFormat(formatOut);
}
}
void MyAudioRecorder::createAudioInput(){
m_audioInput = new QAudioInput(m_InputDevice, formatIn, 0);
}
void MyAudioRecorder::createAudioOutput(){
m_audioOutput = new QAudioOutput(m_OutputDevice, formatOut, 0);
}
void MyAudioRecorder::beginAudio(){
m_output = m_audioOutput->start();
m_input = m_audioInput->start();
}
最佳答案
void MyAudioRecorder::beginAudio(){
m_output = m_audioOutput->start();
m_audioInput->start(m_output);
//Above should do the trick but do check the volume, state and error if any:
qDebug() << "m_audioInput: volume=" << m_audioInput->volume()
<< ", state=" << m_audioInput->state()
<< ", error=" << m_audioInput->error();
qDebug() << "m_audioOutput: volume=" << m_audioOutput->volume()
<< ", state=" << m_audioOutput->state()
<< ", error=" << m_audioOutput->error();
}
关于c++ - 在使用Qt 5.9.4的Fedora上,我无法同时记录和播放音频,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/60381580/