c++将pcm裸数据转成wav

将PCM裸数据转换成WAV文件可以通过以下步骤实现：

1. 打开一个空白的WAV文件，设置文件头部信息。

2. 将PCM数据写入WAV文件。

3. 关闭WAV文件。

下面是一个C++示例代码：

#include <iostream>
#include <fstream>
#include <cstdint>

using namespace std;

void pcm_to_wav(const char* pcm_filename, const char* wav_filename, int sample_rate, int bits_per_sample, int channels)
{
    // 打开PCM文件
    ifstream pcm_file(pcm_filename, ios::binary);
    if (!pcm_file.is_open())
    {
        cerr << "Can't open PCM file: " << pcm_filename << endl;
        return;
    }

    // 打开WAV文件
    ofstream wav_file(wav_filename, ios::binary);
    if (!wav_file.is_open())
    {
        cerr << "Can't create WAV file: " << wav_filename << endl;
        return;
    }

    // 计算数据长度和文件长度
    pcm_file.seekg(0, ios::end);
    uint32_t data_size = pcm_file.tellg();
    uint32_t file_size = 36 + data_size;

    // 设置WAV文件头
    wav_file.write("RIFF", 4);
    wav_file.write((char*)&file_size, 4);
    wav_file.write("WAVE", 4);
    wav_file.write("fmt ", 4);
    uint32_t fmt_size = 16;
    wav_file.write((char*)&fmt_size, 4);
    uint16_t audio_format = 1;
    wav_file.write((char*)&audio_format, 2);
    wav_file.write((char*)&channels, 2);
    wav_file.write((char*)&sample_rate, 4);
    uint32_t byte_rate = sample_rate * channels * bits_per_sample / 8;
    wav_file.write((char*)&byte_rate, 4);
    uint16_t block_align = channels * bits_per_sample / 8;
    wav_file.write((char*)&block_align, 2);
    wav_file.write((char*)&bits_per_sample, 2);
    wav_file.write("data", 4);
    wav_file.write((char*)&data_size, 4);

    // 将PCM数据写入WAV文件
    pcm_file.seekg(0, ios::beg);
    char* buffer = new char[4096];
    while (!pcm_file.eof())
    {
        pcm_file.read(buffer, 4096);
        wav_file.write(buffer, pcm_file.gcount());
    }
    delete[] buffer;

    // 关闭文件
    pcm_file.close();
    wav_file.close();
}

int main()
{
    pcm_to_wav("audio.pcm", "audio.wav", 44100, 16, 2);
    return 0;
}

该代码将PCM文件“audio.pcm”转换为WAV文件“audio.wav”，采样率为44100Hz，每个样本16位，2个声道。你可以根据自己的需要修改这些参数。