1378 static PyObject *
1379 alsamixer_getvolume(alsamixer_t *self, PyObject *args) 
1380 {
1381     snd_mixer_elem_t *elem;
1382     int direction;
1383     int channel;
1384     long ival;
1385     char *dirstr = 0;
1386     PyObject *result;
1387     PyObject *item;
1388     
1389     if (!PyArg_ParseTuple(args,"|s:getvolume",&dirstr)) 
when PyArg_ParseTuple() succeeds
taking False path
1390         return NULL;
1391     
1392     if (!self->handle) 
when treating unknown struct snd_mixer_t * from alsaaudio.c:1392 as non-NULL
taking False path
1393     {
1394         PyErr_SetString(ALSAAudioError, "Mixer is closed");
1395         return NULL;
1396     }
1397     
1398     elem = alsamixer_find_elem(self->handle,self->controlname,self->controlid);
1399     
1400     if (!dirstr) 
when treating unknown const char * from alsaaudio.c:1389 as non-NULL
taking False path
1401     {
1402         if (self->pchannels) 
1403             direction = 0;
1404         else 
1405             direction = 1;
1406     }
1407     else if (strcasecmp(dirstr,"playback")==0) 
when considering range: -0x80000000 <= value <= -1
taking False path
1408         direction = 0;
1409     else if (strcasecmp(dirstr,"capture")==0) 
when considering value == (int)0 from alsaaudio.c:1409
taking True path
1410         direction = 1;
1411     else 
1412     {
1413         PyErr_SetString(ALSAAudioError,"Invalid direction argument for mixer");
1414         return NULL;
1415     }
1416 
1417     result = PyList_New(0);
when PyList_New() fails
1418 
1419     for (channel = 0; channel <= SND_MIXER_SCHN_LAST; channel++) {
taking True path
1420         if (direction == 0 && 
taking False path
1421             snd_mixer_selem_has_playback_channel(elem, channel)) 
1422         {
1423             snd_mixer_selem_get_playback_volume(elem, channel, &ival);
1424             item = PyLong_FromLong(alsamixer_getpercentage(self->pmin,
1425                                                            self->pmax,
1426                                                            ival));
1427             PyList_Append(result, item);
1428             Py_DECREF(item);
1429         }
1430         else if (direction == 1
taking True path
1431                  && snd_mixer_selem_has_capture_channel(elem, channel)
when considering range: -0x80000000 <= value <= -1
taking True path
1432                  && snd_mixer_selem_has_capture_volume(elem)) {
when considering range: -0x80000000 <= value <= -1
taking True path
1433             snd_mixer_selem_get_capture_volume(elem, channel, &ival);
1434             item = PyLong_FromLong(alsamixer_getpercentage(self->cmin,
when PyLong_FromLong() succeeds
1435                                                            self->cmax,
1436                                                            ival));
1437             PyList_Append(result, item);
calling PyList_Append with NULL as argument 1 (result) at alsaaudio.c:1437
PyList_Append() invokes Py_TYPE() on the pointer via the PyList_Check() macro, thus accessing (NULL)->ob_type
found 3 similar trace(s) to this
1438             Py_DECREF(item);
1439         }
1440     }
1441 
1442     return result;
1443 }

1378 static PyObject *
1379 alsamixer_getvolume(alsamixer_t *self, PyObject *args) 
1380 {
1381     snd_mixer_elem_t *elem;
1382     int direction;
1383     int channel;
1384     long ival;
1385     char *dirstr = 0;
1386     PyObject *result;
1387     PyObject *item;
1388     
1389     if (!PyArg_ParseTuple(args,"|s:getvolume",&dirstr)) 
when PyArg_ParseTuple() succeeds
taking False path
1390         return NULL;
1391     
1392     if (!self->handle) 
when treating unknown struct snd_mixer_t * from alsaaudio.c:1392 as non-NULL
taking False path
1393     {
1394         PyErr_SetString(ALSAAudioError, "Mixer is closed");
1395         return NULL;
1396     }
1397     
1398     elem = alsamixer_find_elem(self->handle,self->controlname,self->controlid);
1399     
1400     if (!dirstr) 
when treating unknown const char * from alsaaudio.c:1389 as non-NULL
taking False path
1401     {
1402         if (self->pchannels) 
1403             direction = 0;
1404         else 
1405             direction = 1;
1406     }
1407     else if (strcasecmp(dirstr,"playback")==0) 
when considering range: -0x80000000 <= value <= -1
taking False path
1408         direction = 0;
1409     else if (strcasecmp(dirstr,"capture")==0) 
when considering value == (int)0 from alsaaudio.c:1409
taking True path
1410         direction = 1;
1411     else 
1412     {
1413         PyErr_SetString(ALSAAudioError,"Invalid direction argument for mixer");
1414         return NULL;
1415     }
1416 
1417     result = PyList_New(0);
when PyList_New() succeeds
1418 
1419     for (channel = 0; channel <= SND_MIXER_SCHN_LAST; channel++) {
taking True path
1420         if (direction == 0 && 
taking False path
1421             snd_mixer_selem_has_playback_channel(elem, channel)) 
1422         {
1423             snd_mixer_selem_get_playback_volume(elem, channel, &ival);
1424             item = PyLong_FromLong(alsamixer_getpercentage(self->pmin,
1425                                                            self->pmax,
1426                                                            ival));
1427             PyList_Append(result, item);
1428             Py_DECREF(item);
1429         }
1430         else if (direction == 1
taking True path
1431                  && snd_mixer_selem_has_capture_channel(elem, channel)
when considering range: -0x80000000 <= value <= -1
taking True path
1432                  && snd_mixer_selem_has_capture_volume(elem)) {
when considering range: -0x80000000 <= value <= -1
taking True path
1433             snd_mixer_selem_get_capture_volume(elem, channel, &ival);
1434             item = PyLong_FromLong(alsamixer_getpercentage(self->cmin,
when PyLong_FromLong() fails
1435                                                            self->cmax,
1436                                                            ival));
1437             PyList_Append(result, item);
returning -1 from PyList_Append() due to NULL item
1438             Py_DECREF(item);
dereferencing NULL (item->ob_refcnt) at alsaaudio.c:1438
found 3 similar trace(s) to this
1439         }
1440     }
1441 
1442     return result;
1443 }