PCM转wav文件

Question

#include <stdio.h>
#include <string.h>

int main() {

    FILE *fin,*fout;
    char buffer[1028];


    int readcount=0;
    short NumChannels = 1;
    short BitsPerSample = 16;
    int SamplingRate =8000;
    short numOfSamples = 160;

    int ByteRate = NumChannels*BitsPerSample*SamplingRate/8;
    short BlockAlign = NumChannels*BitsPerSample/8;
    int DataSize = NumChannels*numOfSamples *  BitsPerSample/8;
    int chunkSize = 16;
    int totalSize = 36 + DataSize;
    short audioFormat = 1;

    if((fout = fopen("sample.wav", "w")) == NULL)
    {
        printf("Error opening out file ");
    }

    //totOutSample = 0;
    fwrite("RIFF", sizeof(char), 4,fout);
    fwrite(&totalSize, sizeof(int), 1, fout);
    fwrite("WAVE", sizeof(char), 4, fout);
    fwrite("fmt ", sizeof(char), 4, fout);
    fwrite(&chunkSize, sizeof(int),1,fout);
    fwrite(&audioFormat, sizeof(short), 1, fout);
    fwrite(&NumChannels, sizeof(short),1,fout);
    fwrite(&SamplingRate, sizeof(int), 1, fout);
    fwrite(&ByteRate, sizeof(int), 1, fout);
    fwrite(&BlockAlign, sizeof(short), 1, fout);
    fwrite(&BitsPerSample, sizeof(short), 1, fout);
    fwrite("data", sizeof(char), 4, fout);
    fwrite(&DataSize, sizeof(int), 1, fout);
    fclose(fout);
    fin=fopen("sample.raw","r");
    fout=fopen("sample.wav","a");

    while(!feof(fin))
    {
        fgets(buffer,sizeof(buffer),fin);
        fputs(buffer,fout);
    }

    fclose(fin);
    fclose(fout);
}

谁能帮我解决这段代码中的问题。标题是正确的，它甚至正确地写在文件上。但是每当打开 frhed .wav 文件时，它都会显示一个额外的字段。而且文件也没有播放。如果我尝试使用媒体信息打开文件，它会按预期显示属性，但持续时间除外

Format : Wave File size
: 8.29 KiB Duration : 20ms Overall bit rate mode : Constant Overall bit rate
: 3 394 Kbps

Audio Format : PCM Format settings, Endianness : Little Format settings, Sign
: Signed Codec ID : 1 Duration
: 20ms Bit rate mode : Constant Bit rate
: 128 Kbps Channel(s) : 1 channel Sampling rate : 8 000 Hz Bit depth
: 16 bits Stream size : 320 Bytes (4%)

Answer 1

我对文件格式一无所知，但我很难相信它们会有一个二进制头，后跟 ascii 数据。所以我觉得 fgets 和 fputs 的使用有问题，因为 fgets 寻找\n 终止符。因此，如果缓冲区在碰巧找到\n ( 0xa ) 字节之前就已满，则可能会丢失数据。

while(!feof(fin))
{
    fgets(buffer,sizeof(buffer),fin);
    fputs(buffer,fout);
}

这样的事情会更有意义

size_t n;
while((n = fread(buffer, 1, sizeof(buffer), fin)) > 0) {
   if(n != fwrite(buffer, 1, n, fout)) {
      perror("fwrite");
      exit(1);
   }
}
if(n < 0) {
   perror("fread");
   exit(1);
}

还有，为什么关闭fout然后再打开呢？