C语言实现获得wav文件播放总时间

C语言实现获得wav文件播放总时间

// 单位：秒
double get_wav_time_length(char* filename)
{
	double len = 0.0;

	if (filename != NULL)
	{
		FILE* fp;
		fp = fopen(filename, "rb");
		if (fp != NULL)
		{
			int i;
			int j;
			fseek(fp, 28, SEEK_SET);
			fread(&i, sizeof(i), 1, fp);
			fseek(fp, 40, SEEK_SET);
			fread(&j, sizeof(j), 1, fp);		

			fclose(fp);
			fp = NULL;

			len = (double)j/(double)i;
		}
	}

	return len;
}