QTimer

https://www.jb51.net/program/299902krd.htm
https://blog.csdn.net/weixin_34275246/article/details/109015201

头文件：#include <QTimer>，否则报错：invalid use of incomplete type 'class timer'

注意事项

• QTimer会自动回收对象和变量
  必须通过this引用对象，或者引用const修饰常量。否则对象会调用析构函数，再调用对象的方法会导致崩溃，变量的值也会和定义的不一样。

  this->output = new QAudioOutput(format, qApp);
  this->device = this->output->start();
  QTimer *timer_play = new QTimer();
  this->timer_play = timer_play;
  timer_play->setTimerType(Qt::PreciseTimer);
  
  QObject::connect(timer_play, &QTimer::timeout, this, [=](){
      CZLogUtil::getInstance().mprintf("pcm_size :%d\n",pcm_size);
      if (pcm_size > 0) {
          this->output->setVolume(20);
          int readSize = this->output->periodSize();
          int chunks = this->output->bytesFree() / readSize;
          CZLogUtil::getInstance().mprintf("chunks %d\n",chunks);
          while (chunks) {
              QByteArray samples = pcm_arr.mid(0, readSize);
              int len = samples.size();
              pcm_arr.remove(0, len);
              CZLogUtil::getInstance().mprintf("write samples\n");
              if (len) this->device->write(samples);
              if (len != readSize) break;
  
              chunks--;
          }
      }
  });