Convert Xunlei XV media file to FLV media file. Origin: http://hi.baidu.com/naylonslain/item/9586125a9f5979dbd58bac47

convert_xv_flv.c

#include <stdio.h> 
#include <stdlib.h>
 
int convert_file(char *szSourceFile, int bIsFastConv)
{
    char szNewFileName[256] = {0};
    int buffer[0x400];
    int i;
    char flag;
    char data;
    if (bIsFastConv) {   // 一秒转换模式 
        FILE *fp = fopen(szSourceFile, "rb+");
        if (!fp) {
            printf("未找到文件.\n\n");
            return 0;
        }
        fseek(fp, 0x200000, 0);
        for (i = 0; i < 0x400; i++) {
            buffer[i] = fgetc(fp);
        }
        flag = 0x4C - (char)buffer[1];
        if (flag + (char)buffer[2] == 0x56) {
            // 开始解码 
            fseek(fp, 0x200000, 0);
            fputc(0x46, fp);
            
            for (i = 0; i < 3; i++) {
                data = (char)buffer[1 + i] + flag;
                fputc(data, fp);
            }
            for (i = 0; i < 0x3FC; i++) {
                data = (char)buffer[4 + i] + flag;
                fputc(data, fp);
            }
            fseek(fp, 0x20000A, 0);
            fputc(32, fp);
            // 修正文件头 
            fseek(fp, 0, 0);
            fputc(70, fp);
            fputc(76, fp);
            fputc(86, fp);
            fputc(1, fp);
            fputc(5, fp);
            fputc(0, fp);
            fputc(0, fp);
            fputc(0, fp);
            fputc(9, fp);
            fputc(0, fp);
            fputc(0, fp);
            fputc(0, fp);
            fputc(0, fp);
            fputc(255, fp);
            fputc(31, fp);
            fputc(255, fp);
            fputc(241, fp);
            fclose(fp);
            sprintf(&szNewFileName[0], "%s.flv", szSourceFile);
            rename(szSourceFile, &szNewFileName[0]);
            printf("转换完成.\n输出文件: %s\n\n", szNewFileName);
        } else {
            printf("文件格式不正确.\n\n");
            return 0;
        }
    } /*else {   // 常规模式(未完成)
    }*/
    return 1;
}
int main(int argc, char **argv)
{
    char szFileName[256] = {0};
    printf("迅雷XV格式转换器 XVE7s 秒速转换逆向版本\n   Code by Naylon\n   http://hi.baidu.com/naylonslain");
    if (argc > 1) {
        convert_file(argv[1], 1);
    } else {
        // Test Input: "D:\Downloads\000.xv" 
        while (1) {
            scanf("%s", &szFileName[0]);
            convert_file(szFileName, 1);
            memset(&szFileName[0], 0, 256);
        }
    }
    return 0;
}