Fixes a few potential bugs with the MicrophoneArray class and adds some tests.

CHANGELOG.rst

@@ -21,6 +21,9 @@ Bugfix
 - Fixes issue #380: Caused by the attribute ``cartesian`` of ``GridSphere`` not
   being set properly when the grid is only initialized with a number of points.
 
+- Fixes issue #355: Makes the MicrophoneArray class more bug-proof and adds
+  some tests.
+
 `0.8.2`_ - 2024-11-06
 ---------------------
 

pyroomacoustics/beamforming.py

@@ -24,6 +24,8 @@
 
 from __future__ import division
 
+from typing import Sequence
+
 import numpy as np
 import scipy.linalg as la
 
@@ -342,56 +344,89 @@ class MicrophoneArray(object):
     """Microphone array class."""
 
     def __init__(self, R, fs, directivity=None):
-        R = np.array(R)
-        self.dim = R.shape[0]  # are we in 2D or in 3D
-        self.nmic = R.shape[1]  # number of microphones
+        # The array geometry is stored in a (dim, n_mics) array.
+        self.R = np.array(R)  # array geometry
 
         # Check the shape of the passed array
-        if self.dim != 2 and self.dim != 3:
+        if self.dim not in (2, 3):
             dim_mismatch = True
         else:
             dim_mismatch = False
 
-        if R.ndim != 2 or dim_mismatch:
+        if self.R.ndim != 2 or dim_mismatch:
             raise ValueError(
                 "The location of microphones should be described by an array_like "
                 "object with 2 dimensions of shape `(2 or 3, n_mics)` "
                 "where `n_mics` is the number of microphones. Each column contains "
                 "the location of a microphone."
             )
 
-        self.R = R  # array geometry
-
         self.fs = fs  # sampling frequency of microphones
         self.set_directivity(directivity)
 
         self.signals = None
 
         self.center = np.mean(R, axis=1, keepdims=True)
 
+    @property
+    def dim(self):
+        return self.R.shape[0]  # are we in 2D or in 3D
+
+    def __len__(self):
+        return self.R.shape[1]
+
+    @property
+    def nmic(self):
+        """The number of microphones of the array."""
+        return self.__len__()
+
+    @property
+    def M(self):
+        """The number of microphones of the array."""
+        return self.__len__()
+
     @property
     def is_directive(self):
         return any([d is not None for d in self.directivity])
 
     def set_directivity(self, directivities):
         """
-        This functions sets self.directivity as a list of directivities with `n_mics` entries,
-        where `n_mics` is the number of microphones
+        This functions sets self.directivity as a list of directivities with
+        `n_mics` entries, where `n_mics` is the number of microphones.
+
         Parameters
         -----------
         directivities:
-            single directivity for all microphones or a list of directivities for each microphone
+            A single directivity for all microphones or a list of directivities
+            for each microphone
 
         """
 
-        if isinstance(directivities, list):
+        def _is_correct_type(directivity):
+            return directivity is None or isinstance(directivity, Directivity)
+
+        if isinstance(directivities, Sequence):
             # list of directivities specified
-            assert all(isinstance(x, Directivity) for x in directivities)
-            assert len(directivities) == self.nmic
-            self.directivity = directivities
+            for d in directivities:
+                if not _is_correct_type(d):
+                    raise TypeError(
+                        "Directivities should be of Directivity type, or None (got "
+                        f"{type(d)})."
+                    )
+            if not len(directivities) == self.nmic:
+                raise ValueError(
+                    "Please provide a single Directivity for all microphones, or one "
+                    f"per microphone. Got {len(directivities)} directivities for "
+                    f"{self.nmic} mics."
+                )
+            self.directivity = list(directivities)
         else:
+            if not _is_correct_type(directivities):
+                raise TypeError(
+                    "Directivities should be of Directivity type, or None (got "
+                    f"{type(directivities)})."
+                )
             # only 1 directivity specified
-            assert directivities is None or isinstance(directivities, Directivity)
             self.directivity = [directivities] * self.nmic
 
     def record(self, signals, fs):
@@ -505,6 +540,7 @@ def append(self, locs):
             self.directivity += locs.directivity
         else:
             self.R = np.concatenate((self.R, locs), axis=1)
+            self.directivity += [None] * locs.shape[1]
 
         # in case there was already some signal recorded, just pad with zeros
         if self.signals is not None:
@@ -518,13 +554,6 @@ def append(self, locs):
                 axis=0,
             )
 
-    def __len__(self):
-        return self.R.shape[1]
-
-    @property
-    def M(self):
-        return self.__len__()
-
 
 class Beamformer(MicrophoneArray):
     """

pyroomacoustics/tests/test_microphone_array.py

@@ -0,0 +1,101 @@
+import numpy as np
+import pytest
+
+import pyroomacoustics as pra
+
+_FS = 16000
+
+mic_dir0 = pra.FigureEight(
+    orientation=pra.DirectionVector(azimuth=90, colatitude=15, degrees=True)
+)
+mic_dir1 = pra.FigureEight(
+    orientation=pra.DirectionVector(azimuth=180, colatitude=15, degrees=True)
+)
+
+
+@pytest.mark.parametrize("shape", ((1, 2, 3), (10, 2), (1, 10), (10,)))
+def test_microphone_array_invalid_shape(shape):
+
+    locs = np.ones(shape)
+    with pytest.raises(ValueError):
+        pra.MicrophoneArray(locs, fs=_FS)
+
+
+@pytest.mark.parametrize(
+    "directivity, exception_type",
+    (
+        ("omni", TypeError),
+        (["omni"] * 3, TypeError),
+        ([mic_dir0, "omni", mic_dir1] * 3, TypeError),
+        ([mic_dir0, mic_dir1], ValueError),
+    ),
+)
+def test_microphone_array_invalid_directivity(directivity, exception_type):
+
+    locs = np.ones((3, 3))
+    with pytest.raises(exception_type):
+        pra.MicrophoneArray(locs, fs=_FS, directivity=directivity)
+
+
+@pytest.mark.parametrize(
+    "shape, with_dir, same_dir",
+    (
+        ((2, 1), False, False),
+        ((2, 2), False, False),
+        ((2, 3), False, False),
+        ((3, 1), False, False),
+        ((3, 3), False, False),
+        ((3, 4), False, False),
+        ((2, 3), True, False),
+        ((3, 4), True, False),
+        ((2, 3), True, True),
+        ((3, 4), True, True),
+    ),
+)
+def test_microphone_array_shape_correct(shape, with_dir, same_dir):
+
+    locs = np.ones(shape)
+    if with_dir:
+        if same_dir:
+            mdir = [mic_dir0] * shape[1]
+        else:
+            mdir = [mic_dir0, mic_dir1] + [None] * (shape[1] - 2)
+    else:
+        mdir = None
+    mic_array = pra.MicrophoneArray(locs, fs=_FS, directivity=mdir)
+
+    assert mic_array.dim == shape[0]
+    assert mic_array.M == shape[1]
+    assert mic_array.nmic == mic_array.M
+    assert len(mic_array.directivity) == shape[1]
+
+
+@pytest.mark.parametrize(
+    "shape1, shape2, with_dir, from_raw_locs",
+    (
+        ((3, 2), (3, 2), False, False),
+        ((3, 2), (3, 2), False, True),
+        ((3, 2), (3, 2), False, False),
+        ((3, 2), (3, 2), False, True),
+        ((3, 2), (3, 2), True, False),
+        ((3, 2), (3, 2), True, True),
+        ((3, 2), (3, 1), False, False),
+        ((3, 2), (3, 1), False, True),
+    ),
+)
+def test_microphone_array_append(shape1, shape2, with_dir, from_raw_locs):
+    if with_dir:
+        mdir = [mic_dir0, mic_dir1] + [None] * (shape1[1] - 2)
+    else:
+        mdir = None
+
+    mic_array = pra.MicrophoneArray(np.ones(shape1), fs=_FS, directivity=mdir)
+
+    if from_raw_locs:
+        mic_array.append(np.ones(shape2))
+
+    else:
+        mic_array.append(pra.MicrophoneArray(np.ones(shape2), fs=_FS))
+
+    assert mic_array.nmic == shape1[1] + shape2[1]
+    assert len(mic_array.directivity) == shape1[1] + shape2[1]