在Visual Studio 2012中使用C ++ 11，我试图听到我在Pascal中观察到的声音。在Pascal中，您似乎能够向内置扬声器发送频率，该内置扬声器播放此频率，直到您告诉它停止（或直到您告诉它播放不同的频率）。所以这就是我需要的：
我在visual studio中找不到任何可包含的库/标题，它们能够向内部扬声器发送波形。我愿意尝试直接与内部发言人合作（我知道这很难，但我不是白痴 - 我想我可以通过一些指导来解决它），但我找不到任何文件在Windows中访问内部扬声器。
编辑：从this post，我得知大多数计算机现在实际上没有内置扬声器。游民。这很好 - 我可以使用连接的扬声器，但我仍然有以下要求：
编辑2 ：这是我正在上课的课程：
#define HALF_NOTE 1.059463094359 // HALF_NOTE ^ 12 = 2
#include <Windows.h>
#include <math.h>
class SoundEffect
{
public:
SoundEffect(){}
void Play()
{
for (int i = 0; data[i + 1] > 0; i++)
{
Beep(16 * pow(HALF_NOTE, data[i++] - 1), data[i] * 10); // (frequency of c0) * (twelfth root of 2) ^ (number of half steps above c0)
// Ideally, the code would look more like this (pseudocode):
// sound(16 * pow(HALF_NOTE, data[i++] - 1)); // Start playing the specified frequency
// delay(data[i] * 10);
}
// nosound();
}
int& operator[] (int location) { return data[location]; }
private:
int data[256];
};
答案 0 :(得分：1)
我在不久前搜索了类似的东西（生成简单的声音），发现这些库可以完成这项工作：
但是，我没有时间尝试比较它们。玩得开心:)）答案 1 :(得分：1)
我最终使用Windows Multimedia API创建波形并将其发送到声音设备。我的解决方案基于教程here。这就是我最终的结果：
#define HALF_NOTE 1.059463094359 // HALF_NOTE ^ 12 = 2
#define PI 3.14159265358979
#include <Windows.h>
#include <math.h>
using namespace std;
class SoundEffect
{
public:
SoundEffect()
{
m_data = NULL;
}
SoundEffect(const int noteInfo[], const int arraySize)
{
// Initialize the sound format we will request from sound card
m_waveFormat.wFormatTag = WAVE_FORMAT_PCM; // Uncompressed sound format
m_waveFormat.nChannels = 1; // 1 = Mono, 2 = Stereo
m_waveFormat.wBitsPerSample = 8; // Bits per sample per channel
m_waveFormat.nSamplesPerSec = 11025; // Sample Per Second
m_waveFormat.nBlockAlign = m_waveFormat.nChannels * m_waveFormat.wBitsPerSample / 8;
m_waveFormat.nAvgBytesPerSec = m_waveFormat.nSamplesPerSec * m_waveFormat.nBlockAlign;
m_waveFormat.cbSize = 0;
int dataLength = 0, moment = (m_waveFormat.nSamplesPerSec / 75);
double period = 2.0 * PI / (double) m_waveFormat.nSamplesPerSec;
// Calculate how long we need the sound buffer to be
for (int i = 1; i < arraySize; i += 2)
dataLength += (noteInfo[i] != 0) ? noteInfo[i] * moment : moment;
// Allocate the array
m_data = new char[m_bufferSize = dataLength];
int placeInData = 0;
// Make the sound buffer
for (int i = 0; i < arraySize; i += 2)
{
int relativePlaceInData = placeInData;
while ((relativePlaceInData - placeInData) < ((noteInfo[i + 1] != 0) ? noteInfo[i + 1] * moment : moment))
{
// Generate the sound wave (as a sinusoid)
// - x will have a range of -1 to +1
double x = sin((relativePlaceInData - placeInData) * 55 * pow(HALF_NOTE, noteInfo[i]) * period);
// Scale x to a range of 0-255 (signed char) for 8 bit sound reproduction
m_data[relativePlaceInData] = (char) (127 * x + 128);
relativePlaceInData++;
}
placeInData = relativePlaceInData;
}
}
SoundEffect(SoundEffect& otherInstance)
{
m_bufferSize = otherInstance.m_bufferSize;
m_waveFormat = otherInstance.m_waveFormat;
if (m_bufferSize > 0)
{
m_data = new char[m_bufferSize];
for (int i = 0; i < otherInstance.m_bufferSize; i++)
m_data[i] = otherInstance.m_data[i];
}
}
~SoundEffect()
{
if (m_bufferSize > 0)
delete [] m_data;
}
SoundEffect& operator=(SoundEffect& otherInstance)
{
if (m_bufferSize > 0)
delete [] m_data;
m_bufferSize = otherInstance.m_bufferSize;
m_waveFormat = otherInstance.m_waveFormat;
if (m_bufferSize > 0)
{
m_data = new char[m_bufferSize];
for (int i = 0; i < otherInstance.m_bufferSize; i++)
m_data[i] = otherInstance.m_data[i];
}
return *this;
}
void Play()
{
// Create our "Sound is Done" event
m_done = CreateEvent (0, FALSE, FALSE, 0);
// Open the audio device
if (waveOutOpen(&m_waveOut, 0, &m_waveFormat, (DWORD) m_done, 0, CALLBACK_EVENT) != MMSYSERR_NOERROR)
{
cout << "Sound card cannot be opened." << endl;
return;
}
// Create the wave header for our sound buffer
m_waveHeader.lpData = m_data;
m_waveHeader.dwBufferLength = m_bufferSize;
m_waveHeader.dwFlags = 0;
m_waveHeader.dwLoops = 0;
// Prepare the header for playback on sound card
if (waveOutPrepareHeader(m_waveOut, &m_waveHeader, sizeof(m_waveHeader)) != MMSYSERR_NOERROR)
{
cout << "Error preparing Header!" << endl;
return;
}
// Play the sound!
ResetEvent(m_done); // Reset our Event so it is non-signaled, it will be signaled again with buffer finished
if (waveOutWrite(m_waveOut, &m_waveHeader, sizeof(m_waveHeader)) != MMSYSERR_NOERROR)
{
cout << "Error writing to sound card!" << endl;
return;
}
// Wait until sound finishes playing
if (WaitForSingleObject(m_done, INFINITE) != WAIT_OBJECT_0)
{
cout << "Error waiting for sound to finish" << endl;
return;
}
// Unprepare our wav header
if (waveOutUnprepareHeader(m_waveOut, &m_waveHeader,sizeof(m_waveHeader)) != MMSYSERR_NOERROR)
{
cout << "Error unpreparing header!" << endl;
return;
}
// Close the wav device
if (waveOutClose(m_waveOut) != MMSYSERR_NOERROR)
{
cout << "Sound card cannot be closed!" << endl;
return;
}
// Release our event handle
CloseHandle(m_done);
}
private:
HWAVEOUT m_waveOut; // Handle to sound card output
WAVEFORMATEX m_waveFormat; // The sound format
WAVEHDR m_waveHeader; // WAVE header for our sound data
HANDLE m_done; // Event Handle that tells us the sound has finished being played.
// This is a very efficient way to put the program to sleep
// while the sound card is processing the sound buffer
char* m_data; // Sound data buffer
int m_bufferSize; // Size of sound data buffer
};
相当复杂，但确实有效。我用这样的文本文件（DOS mario＆amp; luigi的声音效果）：
LifeMusic 56 8 61 8 65 8 61 8 63 8 68 8
GrowMusic 37 4 44 4 49 4 38 4 45 4 50 4 39 4 46 4 51 4
CoinMusic 66 1
PipeMusic 13 0 13 8 1 0 1 16 13 0 13 8 1 0 1 16 13 0 13 8 1 0 1 16
FireMusic 41 1 46 1
HitMusic 25 2 13 3 1 4 25 1 13 2 1 3
DeadMusic 25 3 13 4 1 6
NoteMusic 1 3 13 4 1 6
StarMusic 37 4 41 4 44 4 49 4 53 4 56 4 61 4 65 4 68 4 73 4
为了简要概述，我的主文件读入这些行。对于每一行，它从整数数组创建声音效果，并创建一个地图，其中键是声音效果的名称，值是创建的SoundEffect个实例。
在文本文件中，每一行应具有偶数个整数。如果你将一行整数分成两对，第一个数字将是A1之上的半步数（以确定频率），第二个数字将是持续时间，以75秒为单位（任意，I知道）。