Refactoring objectmix

Object mix classes in new file

sound_objects/intern/object_mix.py

@@ -0,0 +1,138 @@
+import os
+import bpy
+from contextlib import contextmanager
+from fractions import Fraction
+from typing import List
+
+from ear.fileio.adm.elements import ObjectCartesianPosition, JumpPosition, AudioBlockFormatObjects
+from ear.fileio.bw64 import Bw64Reader
+
+from sound_objects.intern.generate_adm import adm_object_rendering_context
+from sound_objects.intern.geom_utils import speaker_active_time_range, compute_relative_vector, room_norm_vector
+from sound_objects.intern.speaker_utils import solo_speakers, unmute_all_speakers
+
+
+class ObjectMix:
+    def __init__(self, sources: List[bpy.types.Speaker],
+                 scene: bpy.types.Scene, base_dir: str):
+        self.sources = sources
+        self.intermediate_filename = None
+        self.base_dir = base_dir
+        self.scene = scene
+        self._mixdown_file_handle = None
+        self._mixdown_reader = None
+
+    @property
+    def frame_start(self):
+        return self.scene.frame_start
+
+    @property
+    def frame_end(self):
+        return self.scene.frame_end
+
+    @property
+    def mixdown_reader(self) -> Bw64Reader:
+        if self._mixdown_reader is None:
+            self._mixdown_reader = Bw64Reader(self.mixdown_file_handle)
+
+        return self._mixdown_reader
+
+    @property
+    def mixdown_file_handle(self):
+        if self._mixdown_file_handle is None:
+            self._mixdown_file_handle = open(self.mixdown_filename, 'rb')
+
+        return self._mixdown_file_handle
+
+    @property
+    def mixdown_filename(self):
+        if self.intermediate_filename is None:
+            self.mixdown()
+
+        return self.intermediate_filename
+
+    @property
+    def object_name(self):
+        return self.sources[0].name
+
+    def mixdown(self):
+        with adm_object_rendering_context(self.scene) as scene:
+            solo_speakers(scene, self.sources)
+
+            scene_name = bpy.path.clean_name(scene.name)
+            speaker_name = bpy.path.clean_name(self.object_name)
+
+            self.intermediate_filename = os.path.join(self.base_dir, "%s_%s.wav" % (scene_name, speaker_name))
+
+            bpy.ops.sound.mixdown(filepath=self.intermediate_filename,
+                                  container='WAV', codec='PCM', format='S24')
+
+            print("Created mixdown named {}".format(self.intermediate_filename))
+
+            unmute_all_speakers(scene)
+
+    def adm_block_formats(self, room_size=1.):
+        fps = self.scene.render.fps
+        block_formats = []
+
+        for speaker_obj in self.sources:
+            speaker_interval = speaker_active_time_range(speaker_obj)
+            for frame in range(speaker_interval.start_frame, speaker_interval.end_frame + 1):
+                self.scene.frame_set(frame)
+                relative_vector = compute_relative_vector(camera=self.scene.camera, target=speaker_obj)
+
+                norm_vec = room_norm_vector(relative_vector, room_size=room_size)
+
+                pos = ObjectCartesianPosition(X=norm_vec.x, Y=norm_vec.y, Z=norm_vec.z)
+
+                if len(block_formats) == 0 or pos != block_formats[-1].position:
+                    jp = JumpPosition(flag=True, interpolationLength=Fraction(1, fps * 2))
+                    block = AudioBlockFormatObjects(position=pos,
+                                                    rtime=Fraction(frame, fps),
+                                                    duration=Fraction(1, fps),
+                                                    cartesian=True,
+                                                    jumpPosition=jp)
+
+                    block_formats.append(block)
+                else:
+                    block_formats[-1].duration = block_formats[-1].duration + Fraction(1, fps)
+
+        return block_formats
+
+    def rm_mixdown(self):
+        if self._mixdown_reader is not None:
+            self._mixdown_reader = None
+
+        if self._mixdown_file_handle is not None:
+            self._mixdown_file_handle.close()
+            self._mixdown_file_handle = None
+
+        os.remove(self.intermediate_filename)
+        self.intermediate_filename = None
+
+
+@contextmanager
+class ObjectMixPool:
+
+    @classmethod
+    def pool_from_source_groups(cls, groups: List[List[bpy.types.Speaker]]):
+        mixes = []
+        for group in groups:
+            mixes.append(ObjectMix(sources=group))
+
+        return ObjectMixPool(object_mixes=mixes)
+
+    def __init__(self, object_mixes: List[ObjectMix]):
+        self.object_mixes = object_mixes
+
+    def __enter__(self):
+        return self
+
+    def __exit__(self, exc_type, exc_val, exc_tb):
+        for mix in self.object_mixes:
+            mix.rm_mixdown()
+
+    @property
+    def shortest_file_length(self):
+        lengths = map(lambda f: len(f.mixdown_reader))
+        return min(lengths)