C++ C：为什么我的 CS50 音频反码不起作用

我正在try 写一个音频反向过滤器的代码，将反向CS50课程(编程新手)音频WAV文件.我设法完成了整个任务，并在一个输入文件上进行了try ，但我听到的声音颠倒了过来，然而，判断50函数指出，我的文件没有正确颠倒.当我不知道问题出在哪里时，我很难发现问题所在.我希望有人能发现我遗漏的一个明显的问题.

我只是一直通读代码，找不到具体的问题.我try 颠倒我的输出文件，它听起来与输入文件一模一样，但我不能确定它是否在幕后实际上是相同的.

#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>

#include "wav.h"

int check_format(WAVHEADER header);
int get_block_size(WAVHEADER header);

int main(int argc, char *argv[])
{
    // Ensure proper usage
    // TODO #1
    if (argc != 3)
    {
        printf("Usage: ./reverse inputfilename.wav outputfilename.wav\n");
        return 1;
    }

    // Open input file for reading
    // TODO #2
    FILE *input = fopen(argv[1], "r");
    if (input == NULL)
    {
        printf("Could not open %s.\n", argv[1]);
        return 1;
    }

    // Read header
    // TODO #3
    WAVHEADER *buffer = malloc(1 * sizeof(WAVHEADER));
    fread(buffer, sizeof(WAVHEADER), 1, input);

    // Use check_format to ensure WAV format
    // TODO #4
    if (check_format(*buffer) == 1)
    {
        printf("input file format not supported\n");
        return 1;
    }

    // Open output file for writing
    // TODO #5
    FILE *output = fopen(argv[2], "w");
    if (output == NULL)
    {
        fclose(input);
        printf("Could not create %s.\n", argv[2]);
        return 5;
    }

    // Write header to file
    // TODO #6
    fwrite(buffer, sizeof(WAVHEADER), 1, output);

    // Use get_block_size to calculate size of block
    // TODO #7
    int block_size = get_block_size(*buffer);

    // Write reversed audio to file
    // TODO #8
    FILE *temp = malloc(block_size);
    fseek(input, -1 * block_size, SEEK_END);
    fread(temp, block_size, 1, input);
    fwrite(temp, block_size, 1, output);

    while (ftell(input) > 44 || ftell(input) == 44)
    {
        fseek(input, -2 * block_size, SEEK_CUR);
        fread(temp, block_size, 1, input);
        fwrite(temp, block_size, 1, output);
    }
    fclose(input);
    fclose(output);
    free(temp);
    free(buffer);
}

int check_format(WAVHEADER header)
{
    // TODO #4
    if (header.format[0] != 'W' || header.format[1] != 'A' || header.format[2] != 'V' || header.format[3] != 'E')
    {
        return 1;
    }
    return 0;
}

int get_block_size(WAVHEADER header)
{
    // TODO #7
    int answer = 0;
    answer = (header.bitsPerSample / 8) * header.numChannels;
    return answer;
}