light9 Files · dmx_usb_module/dmx.pyx

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Location: light9/dmx_usb_module/dmx.pyx

94039df5cdd9 770 B text/x-cython Show Annotation Show as Raw Download as Raw

David McClosky

create Playlist class which is now used in wavecurve, musicPad, and ascoltami2.
Ignore-this: da54d0239906e81ad5d95741d22f5975
Several other refactorings. Also, totally untested.

cdef extern from "fcntl.h":
    int open(char *pathname, int flags)
    int O_WRONLY

cdef extern from "unistd.h":
    int write(int fd, void *buf, int count)

cdef extern from "string.h":
    char *strncpy(char *dest, char *src, int n)

cdef extern from "Python.h":
    char* PyString_AsString(object string)

cdef class Dmx:
    cdef int fd
    def __cinit__(self, port="/dev/dmx0"):
        self.fd = open(port, O_WRONLY)
        if self.fd < 0:
            raise OSError("open failed")

    def write(self, buf):
        cdef char *cbuf
        cbuf = PyString_AsString(buf)
        if cbuf == NULL:
            raise ValueError("string buffer conversion failed")
        res = write(self.fd, cbuf, 513)
        if res < 0:
            raise OSError("write failed")