tcp流中提取ts

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#define TS_SIZE 188 
#define RTP_HEDER_SIZE 12
#define SYNC_BYTE 0x47
#define BUFFER_SIZE 1024*1024*2
int main(int argc, char **argv) {
    int count = 0;
    char buffer[BUFFER_SIZE];
    char ts_buf[TS_SIZE];
    printf("%s %sn", argv[1], argv[2]);
    int inFd = open(argv[1], O_RDONLY);
    int outFd = open(argv[2], O_RDWR | O_CREAT);
    if(inFd < 0 || outFd < 0) {
        printf("open file error !n");
        perror("open file error:");
        return 0;
    }
    int ret = -1;
    int startPos = 0;
    while((ret = read(inFd, buffer+startPos, BUFFER_SIZE - 3*TS_SIZE)) > 0) { 
        int i = 0;
        for(i = 0;i < ret - 3*TS_SIZE; i++) {
            int findTs = 0;
            if((buffer[i] == 0x47) && (buffer[i+TS_SIZE] == 0x47) && (buffer[i+TS_SIZE*2] == 0x47)) {
                for(;i < ret - TS_SIZE; i += TS_SIZE) {
                    if(buffer[i] == 0x47) {
                        write(outFd, buffer+i, TS_SIZE);
                        count++;
                    } else {
                        break;
                    }
                }
                findTs = 1;
            }
        }
        memcpy(buffer, buffer+i, (size_t)(ret-i));
        startPos = ret - i;
        printf("startPos %dn", startPos);
    }
    printf("ts count %dn", count);
    close(inFd);
    close(outFd);
    return 0;
}