Original commit message from CVS:
* sys/oss/gstossmixer.c: (gst_ossmixer_open), (gst_ossmixer_new):
* sys/oss/gstossmixerelement.c: (gst_oss_mixer_element_class_init),
(gst_oss_mixer_element_init), (gst_oss_mixer_element_set_property),
(gst_oss_mixer_element_get_property),
(gst_oss_mixer_element_change_state):
* sys/oss/gstossmixerelement.h:
Small cleanups. Better error reporting.
Add device property for the mixer instead of the hardcoded
/dev/mixer. Fixes #350785.
API: GstOssMixerElement::device property