问为什么这种双缓冲方案每次从磁盘读取音频文件时都会产生可听到的点击？

EN

#include <windows.h>
#include <mmsystem.h>
#include <iostream>
#include <fstream>
#include <bitset>
#pragma comment(lib, "winmm.lib")

HWAVEOUT hWaveOut = 0;
WAVEFORMATEX wfx;

int main() {
  wfx = { WAVE_FORMAT_PCM, 2, 44100, 176400, 4, 16, 0 };
  waveOutOpen(&hWaveOut, WAVE_MAPPER, &wfx, 0, 0, CALLBACK_NULL);
  
  const int increment = 80000;
  WAVEHDR* oldHeader = nullptr;
  for (int k = 0; k < 50; k++) {
    std::ifstream inStream;
    inStream.open("test4.wav", std::ios::in | std::ios::binary);
    char headerInfo[44]; //get past the wav header to the audio data
    inStream.read(headerInfo, 44);
    while (true) {
      char* buffer = new char[increment];
      inStream.read(buffer, increment);
      DWORD bytesRead = inStream.gcount();
      if (bytesRead <= 0) {
        break;
      } 
      WAVEHDR* header = new WAVEHDR{ buffer, bytesRead, 0, 0, 0, 0, 0, 0 };
      waveOutPrepareHeader(hWaveOut, header, sizeof(WAVEHDR));
      waveOutWrite(hWaveOut, header, sizeof(WAVEHDR));
      if (oldHeader != nullptr) {
        while (!(oldHeader->dwFlags & WHDR_DONE)) {
          Sleep(1);
        }
        waveOutUnprepareHeader(hWaveOut, oldHeader, sizeof(oldHeader));
        delete[] oldHeader->lpData;
        delete oldHeader;
      }
      oldHeader = header;
    }
  }
}