add voice level getter

shared-bindings/audioio/MixerVoice.c

@@ -113,6 +113,22 @@ STATIC mp_obj_t audioio_mixervoice_obj_stop(size_t n_args, const mp_obj_t *pos_a
 }
 MP_DEFINE_CONST_FUN_OBJ_KW(audioio_mixervoice_stop_obj, 1, audioio_mixervoice_obj_stop);
 
+//|   .. method:: get_gain(voice, gain)
+//|
+//|     Get the gain of a voice.
+//|
+//|     Returns as a floating point number between 0 and 1
+//|
+STATIC mp_obj_t audioio_mixervoice_obj_get_level(mp_obj_t self_in) {
+
+	#if !MICROPY_PY_BUILTINS_FLOAT
+	#error "floating point not supported"
+	#endif
+
+    return mp_obj_new_float(common_hal_audioio_mixervoice_get_level(self_in));
+}
+MP_DEFINE_CONST_FUN_OBJ_1(audioio_mixervoice_get_level_obj, audioio_mixervoice_obj_get_level);
+
 //|   .. method:: set_gain(voice, gain)
 //|
 //|     Set the gain of a voice.
@@ -146,7 +162,7 @@ MP_DEFINE_CONST_FUN_OBJ_KW(audioio_mixervoice_set_level_obj, 1, audioio_mixervoi
 
 const mp_obj_property_t audioio_mixervoice_level_obj = {
     .base.type = &mp_type_property,
-    .proxy = {(mp_obj_t)&mp_const_none_obj,
+    .proxy = {(mp_obj_t)&audioio_mixervoice_get_level_obj,
               (mp_obj_t)&audioio_mixervoice_set_level_obj,
               (mp_obj_t)&mp_const_none_obj},
 };

shared-bindings/audioio/MixerVoice.h

@@ -21,6 +21,7 @@ void common_hal_audioio_mixervoice_deinit(audioio_mixervoice_obj_t* self);
 void common_hal_audioio_mixervoice_set_parent(audioio_mixervoice_obj_t* self, audioio_mixer_obj_t *parent);
 void common_hal_audioio_mixervoice_play(audioio_mixervoice_obj_t* self, mp_obj_t sample, bool loop);
 void common_hal_audioio_mixervoice_stop(audioio_mixervoice_obj_t* self);
+float common_hal_audioio_mixervoice_get_level(audioio_mixervoice_obj_t* self);
 void common_hal_audioio_mixervoice_set_level(audioio_mixervoice_obj_t* self, float gain);
 
 bool common_hal_audioio_mixervoice_get_playing(audioio_mixervoice_obj_t* self);

shared-module/audioio/MixerVoice.c

@@ -18,6 +18,10 @@ void common_hal_audioio_mixervoice_set_parent(audioio_mixervoice_obj_t* self, au
 	self->parent = parent;
 }
 
+float common_hal_audioio_mixervoice_get_level(audioio_mixervoice_obj_t* self) {
+	return self->level;
+}
+
 void common_hal_audioio_mixervoice_set_level(audioio_mixervoice_obj_t* self, float level) {
 	self->level = level * ((1 << 15)-1);
 }