尝试编写通过WinAPI录制和播放声音的函数

我正在尝试在C中创建2个函数：

• 一个录制麦克风X秒
• 获得录音并播放给用户的录音

这就是我写的：

#include  #include  using namespace std; #pragma comment(lib, "winmm.lib") WAVEHDR StartRecord(int seconds) { const int NUMPTS = 44100 * seconds; int sampleRate = 44100; short int *waveIn = new short int[NUMPTS]; HWAVEIN hWaveIn; WAVEHDR WaveInHdr; MMRESULT result; WAVEFORMATEX pFormat; pFormat.wFormatTag = WAVE_FORMAT_PCM; pFormat.nChannels = 1; pFormat.nSamplesPerSec = sampleRate; pFormat.nAvgBytesPerSec = 2 * sampleRate; pFormat.nBlockAlign = 2; pFormat.wBitsPerSample = 16; pFormat.cbSize = 0; result = waveInOpen(&hWaveIn, WAVE_MAPPER, &pFormat, 0, 0, WAVE_FORMAT_DIRECT); if(result) { char fault[256]; waveInGetErrorTextA(result, fault, 256); MessageBoxA(NULL, fault, "Failed to open waveform input device.", MB_OK | MB_ICONEXCLAMATION); } WaveInHdr.lpData = (LPSTR)waveIn; WaveInHdr.dwBufferLength = 2 * NUMPTS; WaveInHdr.dwBytesRecorded = 0; WaveInHdr.dwUser = 0; WaveInHdr.dwFlags = 0; WaveInHdr.dwLoops = 0; waveInPrepareHeader(hWaveIn, &WaveInHdr, sizeof(WAVEHDR)); result = waveInAddBuffer(hWaveIn, &WaveInHdr, sizeof(WAVEHDR)); if(result) { MessageBoxA(NULL, "Failed to read block from device", NULL, MB_OK | MB_ICONEXCLAMATION); } result = waveInStart(hWaveIn); if(result) { MessageBoxA(NULL, "Failed to start recording", NULL, MB_OK | MB_ICONEXCLAMATION); } cout << "Recording..." << endl; Sleep(seconds * 1000); //Sleep while recording return WaveInHdr; } void PlayRecord(WAVEHDR WaveInHdr, int seconds) { WAVEFORMATEX pFormat; pFormat.wFormatTag = WAVE_FORMAT_PCM; pFormat.nChannels = 1; pFormat.nSamplesPerSec = 44100; pFormat.nAvgBytesPerSec = 2 * 44100; pFormat.nBlockAlign = 2; pFormat.wBitsPerSample = 16; pFormat.cbSize = 0; HWAVEOUT hWaveOut; if(waveOutOpen(&hWaveOut, WAVE_MAPPER, &pFormat, 0, 0, WAVE_FORMAT_DIRECT)) { MessageBoxA(NULL, "Failed to replay", NULL, MB_OK | MB_ICONEXCLAMATION ); } waveOutWrite(hWaveOut, &WaveInHdr, sizeof(WaveInHdr)); // Playing the data Sleep(seconds * 1000); //Sleep for as long as there was recorded } int main() { PlayRecord(StartRecord(3), 3); return 0; } 

代码有什么问题？ 为什么它不起作用？ 我似乎听不到任何声音……

此外，是否有记录麦克风而不是X秒的选项来记录它，例如直到没有来自麦克风的输入（例如 – 开始录制它，我在麦克风中说一个字，当theres沉默一两秒它会停止录音或什么？）

谢谢！

Answer 1

Re：录制直到麦克风没有输入。 是的，准备几个缓冲区并在WaveInStart之前为每个缓冲区调用waveInAddBuffer。 WaveIn将连续并顺序填充缓冲区，并在填充时将它们返回给您。 您需要使用WaveIn提供的其中一个通知来了解缓冲区何时被填充。 检查缓冲区数据以决定何时停止。 如果你想继续前进，那么将每个填充的缓冲区返回给WaveIn，只要你愿意，它就会一直填充它们。