mpv.py: Add play_bytes convenience function

mpv.py

@@ -1981,6 +1981,17 @@ class MPV(object):
         yield write
         q.put(EOF)
 
+    def play_bytes(self, data):
+        frame = sys._getframe()
+        stream_name = f'__python_mpv_play_generator_{hash(frame)}'
+
+        @self.python_stream(stream_name)
+        def reader():
+            yield data
+            reader.unregister() # unregister itself
+
+        self.play(f'python://{stream_name}')
+
     def python_stream_catchall(self, cb):
         """ Register a catch-all python stream to be called when no name matches can be found. Use this decorator on a
         function that takes a name argument and returns a (generator, size) tuple (with size being None if unknown).

tests/test_mpv.py

@@ -664,6 +664,24 @@ class TestStreams(unittest.TestCase):
         m.terminate()
         disp.stop()
 
+    def test_play_bytes(self):
+        handler = mock.Mock()
+
+        disp = Display()
+        disp.start()
+        m = mpv.MPV(vo=testvo)
+        def cb(evt):
+            handler(evt.as_dict(decoder=mpv.lazy_decoder))
+        m.register_event_callback(cb)
+
+        with open(TESTVID, 'rb') as f:
+            m.play_bytes(f.read())
+
+        m.wait_for_playback()
+        handler.assert_any_call({'event': 'end-file', 'reason': 'eof', 'playlist_entry_id': 1})
+        m.terminate()
+        disp.stop()
+
 
 class TestLifecycle(unittest.TestCase):
     def test_create_destroy(self):