Qt第十六章 多媒体Multimedia
文章目录
- 多媒体
- 音频
-
- 播放音频
- 录制音频
- 低延迟音效
- 低级音频播放和录制
- 推送和拉取
- 解码压缩音频到内存
- 与音频处理相关的类
- 视频
-
- 播放视频
- 处理低级视频帧
- 录制视频
- 与视频处理相关的类
- 支持的媒体格式
多媒体
cmakelist 添加Multimedia模块
设备信息查询
#include 音频
cmakelist 添加MultimediaWidgets模块
播放音频
播放mp3、aac等非原始格式音频
void playAudio()
{
QMediaPlayer* player = new QMediaPlayer;
player->setSource(QUrl::fromLocalFile("E:/KwDownload/song/陈占美-恰似你的温柔.mp3"));
QAudioOutput* adOut = new QAudioOutput;
adOut->setVolume(0.8); // 设置音量，0到1之间
player->setAudioOutput(adOut);
player->play();
}
播放原始音频pcm格式
void playAudio2()
{
QFile file("G:/qtproject/multiMedia/audio.pcm");
file.open(QFile::ReadOnly);
QAudioDevice dev = QMediaDevices::defaultAudioOutput();
QAudioFormat fmt = dev.preferredFormat();
QAudioSink* sink = new QAudioSink(dev, fmt);
QIODevice* iodev = sink->start();
while (true) {
if (sink->bytesFree() > 85535)
iodev->write(file.read(80000));
}
sink->start(iodev);
}
录制音频
存储位置只能是本地文件系统位置，存储格式也是固定的
void Widget::recordAudio()
{
cs = new QMediaCaptureSession;
// 输入设备
audIn = new QAudioInput;
audIn->setVolume(0.8);
// 录制器
recorder = new QMediaRecorder;
cs->setAudioInput(audIn);
cs->setRecorder(recorder);
recorder->setQuality(QMediaRecorder::HighQuality);
recorder->setOutputLocation(QUrl::fromLocalFile("C:/Users/PVer/Desktop/test")); // 设置存储路径
}
void Widget::on_pushButton_clicked()
{
static bool state = true;
if (state) {
ui->pushButton->setText("结束录制");
recorder->record();
} else {
ui->pushButton->setText("开始录制");
recorder->stop();
}
state = !state;
}
低延迟音效
void testSoundEffect()
{
QSoundEffect* ef = new QSoundEffect(QMediaDevices::defaultAudioOutput());
ef->setSource(QUrl::fromLocalFile("../../currency.wav")); // 设置文件路径
ef->setVolume(1);
ef->setLoopCount(2);
ef->play();
}
低级音频播放和录制
void recordAudio()
{
QAudioFormat fmt;
fmt.setChannelCount(2);
fmt.setSampleFormat(QAudioFormat::Float);
fmt.setSampleRate(44100);
if (!QMediaDevices::defaultAudioInput().isFormatSupported(fmt)) {
qCritical() << "不支持该格式";
return;
}
QAudioSource* as = new QAudioSource(QMediaDevices::defaultAudioInput(), fmt);
QFile* file = new QFile("../../test.pcm");
if (!file->open(QFile::ReadWrite)) {
qCritical() << "文件打开失败";
return;
}
as->start(file);
// 设置定时结束录制，否则原始音频太大
QTimer::singleShot(3000, [=] { as->stop(); });
}
推送和拉取
通过QAudiSink类从QIODevice中拉去数据
相反数据可以写入QIODevice
解码压缩音频到内存
与音频处理相关的类
视频
播放视频
void playVideo()
{
QMediaPlayer* player = new QMediaPlayer;
player->setSource(QUrl::fromLocalFile("../../黑神话.mp4"));
// 设置画面输出设备
QVideoWidget* vw = new QVideoWidget;
player->setVideoOutput(vw);
vw->show();
// 设置声音输出设备
QAudioOutput* audio = new QAudioOutput;
player->setAudioOutput(audio);
// 开始播放
player->play();
}
处理低级视频帧
录制视频
void Widget::recordVideo()
{
cs2 = new QMediaCaptureSession;
recorder2 = new QMediaRecorder;
camera = new QCamera(QMediaDevices::defaultVideoInput());
if (!camera->isAvailable()) {
qInfo() << "没有可用摄像头";
return;
}
QVideoWidget* vw = new QVideoWidget;
cs2->setAudioInput(audIn);
cs2->setRecorder(recorder2);
cs2->setVideoOutput(vw);
recorder2->setQuality(QMediaRecorder::HighQuality);
recorder2->setOutputLocation(QUrl::fromLocalFile("C:/Users/PVer/Desktop/vediotest"));
vw->show(); // 显示视频窗口
camera->setActive(true); // 激活相机
}
//按钮的信号与槽连接
void Widget::on_pushButton_2_clicked()
{
static bool state = true;
if (state) {
ui->pushButton_2->setText("结束录制");
recorder2->record();
} else {
ui->pushButton_2->setText("开始录制");
recorder2->stop();
}
state = !state;
}