HOA: allow overloading decoder design for other formats

Author: tomjnixon

ear/core/scenebased/design.py

@@ -1,6 +1,8 @@
+from functools import singledispatch
 import numpy as np
 import warnings
 from .. import hoa
+from ..layout import Layout
 from .. import point_source
 
 
@@ -85,3 +87,13 @@ def design(self, type_metadata):
             decoder /= np.sqrt(np.mean(np.sum(np.dot(decoder, K_v) ** 2, axis=0)))
 
         return decoder
+
+
+@singledispatch
+def build_hoa_decoder_design(layout, **options):
+    return None
+
+
+@build_hoa_decoder_design.register(Layout)
+def _build_hoa_decoder_design_speakers(layout, **options):
+    return HOADecoderDesign(layout, **options)

ear/core/scenebased/renderer.py

@@ -1,6 +1,6 @@
 import numpy as np
 from attr import attrs, attrib
-from .design import HOADecoderDesign
+from .design import build_hoa_decoder_design
 from ..renderer_common import BlockProcessingChannel, InterpretTimingMetadata, ProcessingBlock
 from ..track_processor import MultiTrackProcessor
 
@@ -65,7 +65,7 @@ class HOARenderer(object):
     """
 
     def __init__(self, layout, design_opts={}):
-        self._decoder_design = HOADecoderDesign(layout.without_lfe, **design_opts)
+        self._decoder_design = build_hoa_decoder_design(layout.without_lfe, **design_opts)
         self._output_channels = ~layout.is_lfe
 
         self.block_processing_channels = []