utils.c

        p = url;
    } else {
        char *at,*slash; // PETR: position of '@' character and '/' character

        p++;
        if (*p == '/')
            p++;
        if (*p == '/')
            p++;
        at = strchr(p,'@'); // PETR: get the position of '@'
        slash = strchr(p,'/');  // PETR: get position of '/' - end of hostname
        if (at && slash && at > slash) at = NULL; // PETR: not interested in '@' behind '/'

        q = at ? authorization : hostname;  // PETR: if '@' exists starting with auth.

         while ((at || *p != ':') && *p != '/' && *p != '?' && *p != '\0') { // PETR:
            if (*p == '@') {    // PETR: passed '@'
              if (authorization_size > 0)
                  *q = '\0';
              q = hostname;
              at = NULL;
            } else if (!at) {   // PETR: hostname
              if ((q - hostname) < hostname_size - 1)
                  *q++ = *p;
            } else {
              if ((q - authorization) < authorization_size - 1)
                *q++ = *p;
            }
            p++;
        }
        if (hostname_size > 0)
            *q = '\0';
        if (*p == ':') {
            p++;
            port = strtoul(p, (char **)&p, 10);
        }
    }
    if (port_ptr)
        *port_ptr = port;
    pstrcpy(path, path_size, p);
}

/**
 * Set the pts for a given stream.
 *
 * @param s stream
 * @param pts_wrap_bits number of bits effectively used by the pts
 *        (used for wrap control, 33 is the value for MPEG)
 * @param pts_num numerator to convert to seconds (MPEG: 1)
 * @param pts_den denominator to convert to seconds (MPEG: 90000)
 */
void av_set_pts_info(AVStream *s, int pts_wrap_bits,
                     int pts_num, int pts_den)
{
    s->pts_wrap_bits = pts_wrap_bits;
    s->time_base.num = pts_num;
    s->time_base.den = pts_den;
}

/* fraction handling */

/**
 * f = val + (num / den) + 0.5.
 *
 * 'num' is normalized so that it is such as 0 <= num < den.
 *
 * @param f fractional number
 * @param val integer value
 * @param num must be >= 0
 * @param den must be >= 1
 */
static void av_frac_init(AVFrac *f, int64_t val, int64_t num, int64_t den)
{
    num += (den >> 1);
    if (num >= den) {
        val += num / den;
        num = num % den;
    }
    f->val = val;
    f->num = num;
    f->den = den;
}

/**
 * Set f to (val + 0.5).
 */
static void av_frac_set(AVFrac *f, int64_t val)
{
    f->val = val;
    f->num = f->den >> 1;
}

/**
 * Fractionnal addition to f: f = f + (incr / f->den).
 *
 * @param f fractional number
 * @param incr increment, can be positive or negative
 */
static void av_frac_add(AVFrac *f, int64_t incr)
{
    int64_t num, den;

    num = f->num + incr;
    den = f->den;
    if (num < 0) {
        f->val += num / den;
        num = num % den;
        if (num < 0) {
            num += den;
            f->val--;
        }
    } else if (num >= den) {
        f->val += num / den;
        num = num % den;
    }
    f->num = num;
}