python libmpg123 wrapper

#include <mpg123.h>
#include <ao.h>
#include <Python.h>

#define BITS 8

static PyObject *mpg123_play(PyObject *self, PyObject *args) {
  const char *command;
  int sts;
  if (!PyArg_ParseTuple(args, "s", &command))
    return NULL;
  sts = play(command);
  return PyBuildValue("i", sts);
}

int play(char *filename)
{
    mpg123_handle *mh;
    unsigned char *buffer;
    size_t buffer_size;
    size_t done;
    int err;

    int driver;
    ao_device *dev;

    ao_sample_format format;
    int channels, encoding;
    long rate;

    /* initializations */
    ao_initialize();
    driver = ao_default_driver_id();
    mpg123_init();
    mh = mpg123_new(NULL, &err);
    buffer_size = mpg123_outblock(mh);
    buffer = (unsigned char*) malloc(buffer_size * sizeof(unsigned char));

    /* open the file and get the decoding format */
    mpg123_open(mh, filename);
    mpg123_getformat(mh, &rate, &channels, &encoding);

    /* set the output format and open the output device */
    format.bits = mpg123_encsize(encoding) * BITS;
    format.rate = rate;
    format.channels = channels;
    format.byte_format = AO_FMT_NATIVE;
    format.matrix = 0;
    dev = ao_open_live(driver, &format, NULL);

    /* decode and play */
    while (mpg123_read(mh, buffer, buffer_size, &done) == MPG123_OK)
        ao_play(dev, buffer, done);

    /* clean up */
    free(buffer);
    ao_close(dev);
    mpg123_close(mh);
    mpg123_delete(mh);
    mpg123_exit();
    ao_shutdown();

}

static PyMethodDef SpamMethods[] = {
    {"play", mpg123_play, METH_VARARGS,
     "play an mp3 file using libmpg123"},
    {NULL, NULL, 0, NULL}        /* Sentinel */
};

PyMODINIT_FUNC
initmodule(void)
{
    (void) Py_InitModule("mpg123", SpamMethods);
}

int main(int argc, char **argv) {
  /* Pass argv[0] to the Python interpreter */
  Py_SetProgramName(argv[0]);

  /* Initialize the Python interpreter.  Required. */
  Py_Initialize();
  initmodule();
  return 0;
}