utils.c

            nd = 0;
            while (*p >= '0' && *p <= '9') {
                nd = nd * 10 + *p++ - '0';
            }
            c = *p++;
            switch(c) {
            case '%':
                goto addchar;
            case 'd':
                if (percentd_found)
                    goto fail;
                percentd_found = 1;
                snprintf(buf1, sizeof(buf1), "%0*d", nd, number);
                len = strlen(buf1);
                if ((q - buf + len) > buf_size - 1)
                    goto fail;
                memcpy(q, buf1, len);
                q += len;
                break;
            default:
                goto fail;
            }
        } else {
        addchar:
            if ((q - buf) < buf_size - 1)
                *q++ = c;
        }
    }
    if (!percentd_found)
        goto fail;
    *q = '\0';
    return 0;
 fail:
    *q = '\0';
    return -1;
}

static int gcd(INT64 a, INT64 b)
{
    INT64 c;

    while (1) {
        c = a % b;
        if (c == 0)
            return b;
        a = b;
        b = c;
    }
}

void ticker_init(Ticker *tick, INT64 inrate, INT64 outrate)
{
    int g;

    g = gcd(inrate, outrate);
    inrate /= g;
    outrate /= g;

    tick->value = -outrate/2;

    tick->inrate = inrate;
    tick->outrate = outrate;
    tick->div = tick->outrate / tick->inrate;
    tick->mod = tick->outrate % tick->inrate;
}

/**
 *
 * Print on stdout a nice hexa dump of a buffer
 * @param buf buffer
 * @param size buffer size
 */
void av_hex_dump(UINT8 *buf, int size)
{
    int len, i, j, c;

    for(i=0;i<size;i+=16) {
        len = size - i;
        if (len > 16)
            len = 16;
        printf("%08x ", i);
        for(j=0;j<16;j++) {
            if (j < len)
                printf(" %02x", buf[i+j]);
            else
                printf("   ");
        }
        printf(" ");
        for(j=0;j<len;j++) {
            c = buf[i+j];
            if (c < ' ' || c > '~')
                c = '.';
            printf("%c", c);
        }
        printf("\n");
    }
}