在Windows上播放任意声音？

Question

我如何在Windows（32位和64位，直至Windows 7）上播放本机具有给定幅度和给定频率的声音（例如，由频率2 kHz和3 kHz组成）？

（通过原生我的意思是不使用外部库）。

我相信这需要waveOutWrite方法，但我不知道它是如何工作的。

Answer 1

我得到的东西的工作...

#define _USE_MATH_DEFINES 1 
#include <math.h> 
#include <stdio.h> 
#include <tchar.h> 

#include <windows.h> 
#include <mmreg.h> 
#include <complex> 

#pragma comment(lib, "Winmm.lib") 

MMRESULT play(float nSeconds, 
    float signal(float timeInSeconds, unsigned short channel, void *context), 
    void *context = NULL, unsigned long samplesPerSecond = 48000) 
{ 
    UINT timePeriod = 1; 

    MMRESULT mmresult = MMSYSERR_NOERROR; 
    WAVEFORMATEX waveFormat = {0}; 
    waveFormat.cbSize = 0; 
    waveFormat.wFormatTag = WAVE_FORMAT_IEEE_FLOAT; 
    waveFormat.nChannels = 2; 
    waveFormat.nSamplesPerSec = samplesPerSecond; 
    const size_t nBuffer = 
     (size_t)(nSeconds * waveFormat.nChannels * waveFormat.nSamplesPerSec); 
    float *buffer; 
    waveFormat.wBitsPerSample = CHAR_BIT * sizeof(buffer[0]); 
    waveFormat.nBlockAlign = 
     waveFormat.nChannels * waveFormat.wBitsPerSample/CHAR_BIT; 
    waveFormat.nAvgBytesPerSec = 
     waveFormat.nSamplesPerSec * waveFormat.nBlockAlign; 

    buffer = (float *)calloc(nBuffer, sizeof(*buffer)); 
    __try 
    { 
     for (size_t i = 0; i < nBuffer; i += waveFormat.nChannels) 
      for (unsigned short j = 0; j < waveFormat.nChannels; j++) 
       buffer[i+j] = signal((i+j) * nSeconds/nBuffer, j, context); 
     HWAVEOUT hWavOut = NULL; 
     mmresult = waveOutOpen(&hWavOut, WAVE_MAPPER, 
      &waveFormat, NULL, NULL, CALLBACK_NULL); 
     if (mmresult == MMSYSERR_NOERROR) 
     { 
      __try 
      { 
       timeBeginPeriod(timePeriod); 
       __try 
       { 
        WAVEHDR hdr = {0}; 
        hdr.dwBufferLength = 
         (ULONG)(nBuffer * sizeof(buffer[0])); 
        hdr.lpData = (LPSTR)&buffer[0]; 
        mmresult = waveOutPrepareHeader(hWavOut, 
         &hdr, sizeof(hdr)); 
        if (mmresult == MMSYSERR_NOERROR) 
        { 
         __try 
         { 
          ULONG start = GetTickCount(); 
          mmresult = 
           waveOutWrite(hWavOut, &hdr, sizeof(hdr)); 
          Sleep((ULONG)(1000 * nSeconds 
           - (GetTickCount() - start))); 
         } 
         __finally 
         { waveOutUnprepareHeader(hWavOut, &hdr, sizeof(hdr)); } 
        } 
       } 
       __finally { timeEndPeriod(timePeriod); } 
      } 
      __finally { waveOutClose(hWavOut); } 
     } 
    } 
    __finally { free(buffer); } 
    return mmresult; 
} 

// Triangle wave generator 
float triangle(float timeInSeconds, unsigned short channel, void *context) 
{ 
    const float frequency = *(const float *)context; 
    const float angle = (float)(frequency * 2 * M_PI * timeInSeconds); 
    switch (channel) 
    { 
     case 0: return (float)asin(sin(angle + 0 * M_PI/2)); 
     default: return (float)asin(sin(angle + 1 * M_PI/2)); 
    } 
} 

// Pure tone generator 
float pure(float timeInSeconds, unsigned short channel, void *context) 
{ 
    const float frequency = *(const float *)context; 
    const float angle = (float)(frequency * 2 * M_PI * timeInSeconds); 
    switch (channel) 
    { 
     case 0: return (float)sin(angle + 0 * M_PI/2); 
     default: return (float)sin(angle + 1 * M_PI/2); 
    } 
} 

int _tmain(int argc, _TCHAR* argv[]) 
{ 
    float frequency = 2 * 261.626F; 
    play(1, pure, &frequency); 
    return 0; 
} 

Answer 2

Beep

BOOL WINAPI Beep(
    __in DWORD dwFreq, 
    __in DWORD dwDuration 
); 

Answer 3

经由PC扬声器，或使用的DirectX音动作。 如果需要，我可以提供一些片段。

Answer 4

waveOut功能处理声音波形数据（如果我正确记得，以WAV格式）。

虽然这是针对WPF应用程序，以下链接应该证明对任何桌面应用程序有所帮​​助：

Sound Generation in WPF Applications