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venv/lib/python3.12/site-packages/av/opaque.pyx

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+cimport libav as lib
+from libc.stdint cimport uint8_t, uintptr_t
+from libc.string cimport memcpy
+
+
+cdef void key_free(void *opaque, uint8_t *data) noexcept nogil:
+    cdef char *name = <char *>data
+    with gil:
+        opaque_container.pop(name)
+
+
+cdef class OpaqueContainer:
+    def __cinit__(self):
+        self._objects = {}
+
+    cdef lib.AVBufferRef *add(self, object v):
+        # Use object's memory address as key
+        cdef uintptr_t key = <uintptr_t><long long>id(v)
+        self._objects[key] = v
+
+        cdef uint8_t *data = <uint8_t *>lib.av_malloc(sizeof(uintptr_t))
+        if data == NULL:
+            raise MemoryError("Failed to allocate memory for key")
+
+        memcpy(data, &key, sizeof(uintptr_t))
+
+        # Create the buffer with our free callback
+        cdef lib.AVBufferRef *buffer_ref = lib.av_buffer_create(
+            data, sizeof(uintptr_t), key_free, NULL, 0
+        )
+
+        if buffer_ref == NULL:
+            raise MemoryError("Failed to create AVBufferRef")
+
+        return buffer_ref
+
+    cdef object get(self, char *name):
+        cdef uintptr_t key = (<uintptr_t *>name)[0]
+        return self._objects.get(key)
+
+    cdef object pop(self, char *name):
+        cdef uintptr_t key = (<uintptr_t *>name)[0]
+        return self._objects.pop(key, None)
+
+
+cdef OpaqueContainer opaque_container = OpaqueContainer()