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C语言将PCM编码成WAV文件

  1. 准备一个pcm文件
  2. 编写代码并编译main.exe
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <assert.h>
#include <sys/stat.h>

#pragma warning(disable:4996)

size_t getFileSize(const char* filename) {
    struct stat st;
    if (stat(filename, &st) != 0) {
        perror("无法获取文件大小");
        exit(EXIT_FAILURE);
    }
    return st.st_size;
}

int main(int argc, char* argv[]) {
    assert(argc == 3);

    // 获取输入文件大小
    size_t bufferSize = getFileSize(argv[1]);
    uint8_t* bufferData = (uint8_t*)calloc(bufferSize, sizeof(uint8_t));
    if (bufferData == NULL) {
        perror("内存分配失败");
        return EXIT_FAILURE;
    }

    // 读取输入文件
    FILE* ifs = fopen(argv[1], "rb");
    if (ifs == NULL) {
        perror("无法打开输入文件");
        free(bufferData);
        return EXIT_FAILURE;
    }
    fread(bufferData, sizeof(uint8_t), bufferSize, ifs);
    fclose(ifs);

    // 创建输出缓冲区
    uint8_t* buffer = (uint8_t*)calloc(bufferSize + 44, sizeof(uint8_t));
    if (buffer == NULL) {
        perror("内存分配失败");
        free(bufferData);
        return EXIT_FAILURE;
    }

    // WAV 文件头信息
    const char ChunkID[4] = { 'R', 'I', 'F', 'F' };
    const char Format[4] = { 'W', 'A', 'V', 'E' };
    const char Subchunk1ID[4] = { 'f', 'm', 't', ' ' };
    const char Subchunk2ID[4] = { 'd', 'a', 't', 'a' };

    int32_t Subchunk1Size = 16;
    int16_t AudioFormat = 1;
    int16_t NumChannels = 1;
    int32_t SampleRate = 16000;
    int16_t BitsPerSample = 16;
    int32_t ByteRate = SampleRate * NumChannels * BitsPerSample / 8;
    int16_t BlockAlign = NumChannels * BitsPerSample / 8;
    int32_t Subchunk2Size = (int32_t)bufferSize;
    int32_t ChunkSize = 36 + Subchunk2Size;

    // 写入文件头
    memcpy(buffer, ChunkID, 4);
    memcpy(buffer + 4, &ChunkSize, 4);
    memcpy(buffer + 8, Format, 4);
    memcpy(buffer + 12, Subchunk1ID, 4);
    memcpy(buffer + 16, &Subchunk1Size, 4);
    memcpy(buffer + 20, &AudioFormat, 2);
    memcpy(buffer + 22, &NumChannels, 2);
    memcpy(buffer + 24, &SampleRate, 4);
    memcpy(buffer + 28, &ByteRate, 4);
    memcpy(buffer + 32, &BlockAlign, 2);
    memcpy(buffer + 34, &BitsPerSample, 2);
    memcpy(buffer + 36, Subchunk2ID, 4);
    memcpy(buffer + 40, &Subchunk2Size, 4);

    // 写入文件数据
    memcpy(buffer + 44, bufferData, bufferSize);

    // 写入输出文件
    FILE* ofs = fopen(argv[2], "wb");
    if (ofs == NULL) {
        perror("无法打开输出文件");
        free(bufferData);
        free(buffer);
        return EXIT_FAILURE;
    }
    fwrite(buffer, sizeof(uint8_t), bufferSize + 44, ofs);
    fclose(ofs);

    // 清理资源
    free(bufferData);
    free(buffer);

    return EXIT_SUCCESS;
}

  1. 使用命令行运行程序

    1
    main.exe 落叶的位置.pcm 落叶的位置.wav