audio: Create a class for showing album art

Signed-off-by: Anna Schumaker <Anna@NoWheyCreamery.com>

audio/artwork.py

@@ -0,0 +1,46 @@
+# Copyright 2021 (c) Anna Schumaker.
+from gi.repository import Gtk, GdkPixbuf, Gst
+
+class Artwork(Gtk.AspectFrame):
+    def __init__(self):
+        Gtk.AspectFrame.__init__(self)
+        self.picture = Gtk.Picture()
+
+        self.frame = Gtk.Frame()
+        self.frame.set_child(self.picture)
+
+        self.set_child(self.frame)
+        self.set_obey_child(False)
+        self.set_margin_start(5)
+        self.set_margin_end(5)
+        self.set_margin_top(5)
+        self.set_margin_bottom(5)
+        self.set_ratio(1.0)
+        self.reset()
+
+    def get_default_path(self):
+        display = self.picture.get_display()
+        theme   = Gtk.IconTheme.get_for_display(display)
+        icon    = theme.lookup_icon("emmental", [ ], 1024, 1, 0, 0)
+        return icon.get_file().get_path()
+
+    def set_from_data(self, data):
+        loader = GdkPixbuf.PixbufLoader()
+        loader.write(data)
+
+        pixbuf = loader.get_pixbuf()
+        self.picture.set_pixbuf(pixbuf)
+        loader.close()
+
+    def set_from_sample(self, sample):
+        buffer = sample.get_buffer()
+
+        (res, map) = buffer.map(Gst.MapFlags.READ)
+        if res == True:
+            self.set_from_data(map.data)
+            buffer.unmap(map)
+        else:
+            self.reset()
+
+    def reset(self):
+        self.picture.set_filename(self.get_default_path())

audio/test_artwork.py

@@ -0,0 +1,27 @@
+# Copyright 2021 (c) Anna Schumaker.
+from . import artwork
+from gi.repository import Gtk
+import pathlib
+import unittest
+
+Path = pathlib.Path("./data/hicolor/scalable/apps/emmental.svg")
+
+class TestAudioArtwork(unittest.TestCase):
+    def test_audio_artwork_init(self):
+        art = artwork.Artwork()
+
+        self.assertIsInstance(art, Gtk.AspectFrame)
+        self.assertIsInstance(art.frame, Gtk.Frame)
+        self.assertIsInstance(art.picture, Gtk.Picture)
+
+        self.assertEqual(art.get_child(), art.frame)
+        self.assertEqual(art.frame.get_child(), art.picture)
+        self.assertEqual(art.get_obey_child(), False)
+        self.assertEqual(art.get_ratio(), 1.0)
+
+        self.assertEqual(art.get_margin_start(), 5)
+        self.assertEqual(art.get_margin_end(), 5)
+        self.assertEqual(art.get_margin_top(), 5)
+        self.assertEqual(art.get_margin_bottom(), 5)
+
+        self.assertEqual(art.get_default_path(), str(Path.absolute()))