timestamp.c

linux下的sip voip程序

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

#define DIFF_TIME_STAMP 480

int main(int argc, char* argv[]){
    FILE *fp;
    char str[256];
    char *ptr;
    char *stopstring;
    int val, val_prev = 0, iCnt = 0;

    fp = fopen("c:\\rtp.txt", "r");
    while ( fgets( str, sizeof(str)-1, fp) ){
        if ( NULL == strstr(str, "Timestamp") ) continue;
        ptr = strstr(str, ": ");                
        ptr += 3;
        val = strtol(ptr, &stopstring, 10);            

        if (val_prev == 0 ){
            printf("1st Timestamp is found.\n");
            iCnt = 1;
            val_prev = val;
            continue;
        }
        if (DIFF_TIME_STAMP != val - val_prev){
            printf("err %d, %d in %d th , diff=%d\n", 
                val_prev, val, iCnt, val - val_prev);
        }
        iCnt ++;
        val_prev = val;
    }
    printf("total Timestamp is %d lines\n", iCnt);
    fclose(fp);
    return 0;
}