Question

我正在一个项目中，我需要从c ++的麦克风中获取输入，并创建一个wav文件来存储录制的麦克风。现在，我做了一个简单的功能，可以从麦克风中读取数据并将其转储到bin文件中。我可以大胆地打开它，听到我说的话，但是我希望通过程序中的函数将其转换为声音。无论如何，我可以创建一个函数来将二进制文件转换为WAV格式吗？它不一定要是wav，它可以是任何流行的声音格式，例如mp3。这是我获取声音的功能-

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

#include <Windows.h>
#include <mmsystem.h>
#include <fstream>
#include <iostream>

void AudioReader::AudioReader::AutioToBinary() {
    WAVEFORMATEX wfx = {};
    wfx.wFormatTag = WAVE_FORMAT_PCM;       // PCM is standard
    wfx.nChannels = 2;                      // 2 channels = stereo sound
    wfx.nSamplesPerSec = 44100;             // Samplerate.  44100 Hz
    wfx.wBitsPerSample = 32;                // 32 bit samples

    wfx.nBlockAlign = wfx.wBitsPerSample * wfx.nChannels / 8;
    wfx.nAvgBytesPerSec = wfx.nBlockAlign * wfx.nSamplesPerSec;

    HWAVEIN wi;
    waveInOpen(
        &wi,         
        WAVE_MAPPER,    
        &wfx,          
        NULL, NULL,     
        CALLBACK_NULL | WAVE_FORMAT_DIRECT  
    );

    char buffers[2][44100 * 2 * 2 / 2];   
    WAVEHDR headers[2] = { {},{} };         
    for (int i = 0; i < 2; ++i){
        headers[i].lpData = buffers[i];
        headers[i].dwBufferLength = 44100 * 2 * 2 / 2;      

        waveInPrepareHeader(wi, &headers[i], sizeof(headers[i]));
        waveInAddBuffer(wi, &headers[i], sizeof(headers[i]));
    }

    
    std::ofstream outfile("Audio.bin", std::ios_base::out | std::ios_base::binary);

    std::cout << "Started recording! Press escape when you're ready to stop!\n";
    waveInStart(wi);
  
    while (!(GetAsyncKeyState(VK_ESCAPE) & 0x8000))  {
        for (auto& h : headers) {
            if (h.dwFlags & WHDR_DONE) {
               
                outfile.write(h.lpData, h.dwBufferLength); //dump audio binary to bin file

                h.dwFlags = 0;        
                h.dwBytesRecorded = 0; 

                waveInPrepareHeader(wi, &h, sizeof(h));
                waveInAddBuffer(wi, &h, sizeof(h));
            }
        }
    }
    waveInStop(wi);
    for (auto& h : headers){
        waveInUnprepareHeader(wi, &h, sizeof(h));
    }
    waveInClose(wi);
}

更新：再次您好，我做了更多研究，并制作了自己的标题。我还有另一个问题，如何将标头实现到wav文件中？我尝试使用传统的ofstream方法执行此操作，但此刻目前行不通。这是我为此做的功能-

void AudioReader::AudioReader::BinaryToWav(wavehdr_tag& bin) {
    std::ofstream WavFile("Audio.wav", std::ios_base::binary);

    //FMT Sub-Chunk
    std::string SubChunk1ID = "fmt";
    int SubChunk1Size = 16;
    int AudioFormat = 1;
    int NumChannels = 2;
    int SampleRate = 44100;
    int BitsPerSample = 16;

    int ByteRate = SampleRate * NumChannels * BitsPerSample / 8;
    int BlockAlign = NumChannels * BitsPerSample / 8;

    //Data
    std::string SubChunk2ID = "data";
    int SubChunk2Size = 1 * NumChannels * BitsPerSample / 8;

    //RIFF
    std::string ChunkID = "RIFF";
    int ChunkSize = 4 + (8 + SubChunk1Size) + (8 + SubChunk2Size);
    std::string Format = "WAVE";

    //dump params to file
    WavFile
        << ChunkID
        << ChunkSize 
        << Format 
        << SubChunk1ID 
        << SubChunk1Size 
        << AudioFormat 
        << NumChannels
        << SampleRate 
        << ByteRate 
        << BlockAlign 
        << BitsPerSample
        << SubChunk2ID
        << SubChunk2Size
        << bin.lpData << bin.dwBufferLength;
}

Answer 1

好的，所以我设法找到一篇文章，引导您完成操作。您需要具有bin值才能执行此操作，因此，您可以根据需要使用我的代码从麦克风中获取bin。这是文章，祝您好运！ -http://blog.acipo.com/generating-wave-files-in-c/。另外，这是另一个站点，它对我为什么需要这些标头的理解非常有用-http://soundfile.sapp.org/doc/WaveFormat/。

如何在C ++中将二进制文件转换为WAV文件

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