我试图从一个文件中提取mp3头。这与id 3标签不同-mp3头是保存MPEG版本，比特率，频率等信息的地方。
您可以在此处查看mp3标头结构的概述：http://upload.wikimedia.org/wikipedia/commons/0/01/Mp3filestructure.svg
我的问题是，尽管加载了文件，现在收到了有效的（据我所知）二进制输出，但我没有看到预期的值。mp3文件的前12位应该都是1，作为mp3同步字。然而，我收到的前8位却不同。这对我来说意味着一个问题。
作为一个侧记，我有一个有效的mp3文件通过fopen附加

// Main function
int main (void)
{
    // Declare variables
    FILE *mp3file;
    char requestedFile[255] = "";
    unsigned long fileLength;

    // Counters
    int i;

    // Tryout
    unsigned char byte; // Read from file
    unsigned char mask = 1; // Bit mask
    unsigned char bits[8];

    // Memory allocation with malloc
    // Ignore this at the moment! Will be used in the future
    //mp3syncword=(unsigned int *)malloc(20000);

    // Let's get the name of the file thats requested
    strcpy(requestedFile,"testmp3.mp3"); // lets hardcode this into here for now

    // Open the file
    mp3file = fopen(requestedFile, "rb"); // open the requested file with mode read, binary
    if (!mp3file){
        printf("Not found!"); // if we can't find the file, notify the user of the problem
    }

    // Let's get some header data from the file
    fseek(mp3file,0,SEEK_SET);
    fread(&byte,sizeof(byte),1,mp3file);

    // Extract the bits
    for (int i = 0; i < sizeof(bits); i++) {
        bits[i] = (byte >> i) & mask;
    }

    // For debug purposes, lets print the received data
    for (int i = 0; i < sizeof(bits); i++) {
        printf("Bit: %d\n",bits[i]);
    }