Avoid setting channel variable

av/audio/layout.pyx

@@ -52,16 +52,14 @@ cdef class AudioLayout:
 
     @property
     def channels(self):
-        cdef lib.AVChannel channel
         cdef char buf[16]
         cdef char buf2[128]
 
         results = []
 
         for index in range(self.layout.nb_channels):
-            channel = lib.av_channel_layout_channel_from_index(&self.layout, index);
-            size = lib.av_channel_name(buf, sizeof(buf), channel) - 1
-            size2 = lib.av_channel_description(buf2, sizeof(buf2), channel) - 1
+            size = lib.av_channel_name(buf, sizeof(buf), lib.av_channel_layout_channel_from_index(&self.layout, index)) - 1
+            size2 = lib.av_channel_description(buf2, sizeof(buf2), lib.av_channel_layout_channel_from_index(&self.layout, index)) - 1
             results.append(
                 AudioChannel(
                     PyBytes_FromStringAndSize(buf, size).decode("utf-8"),

setup.py

@@ -26,21 +26,6 @@
 old_embed_signature = EmbedSignature._embed_signature
 
 
-def insert_enum_in_generated_files(source):
-    # Work around Cython failing to add `enum` to `AVChannel` type.
-    # TODO: Make Cython bug report
-    if source.endswith(".c"):
-        with open(source, "r") as file:
-            content = file.read()
-
-        # Replace "AVChannel __pyx_v_channel;" with "enum AVChannel __pyx_v_channel;"
-        modified_content = re.sub(
-            r"\b(?<!enum\s)(AVChannel\s+__pyx_v_\w+;)", r"enum \1", content
-        )
-        with open(source, "w") as file:
-            file.write(modified_content)
-
-
 def new_embed_signature(self, sig, doc):
     # Strip any `self` parameters from the front.
     sig = re.sub(r"\(self(,\s+)?", "(", sig)
@@ -206,10 +191,6 @@ def parse_cflags(raw_flags):
             include_path=["include"],
         )
 
-for ext in ext_modules:
-    for cfile in ext.sources:
-        insert_enum_in_generated_files(cfile)
-
 
 package_folders = pathlib.Path(IMPORT_NAME).glob("**/")
 package_data = {