a helpful function for finding most of the animation datas used in a context or scene

get_anim_datas

def get_anim_datas(context=None):
	if context is None: context = bpy.context
	found = set()
	materials = set()
	textures = set()

	def found_add(o):
		if o is None: raise Exception()
		found.add(o)
	found_add(context.scene)
	found_add(context.scene.world)
	
	for o in context.scene.objects:
		found_add(o)
		if o.data is not None:
			found_add(o.data)
		
		for ms in o.material_slots:
			if ms.material is not None:
				materials.add(ms.material)
		
		if hasattr(o.data, "materials"): materials.update(o.data.materials)
		
		if isinstance(o.data, (bpy.types.Curve, bpy.types.Mesh, bpy.types.Lattice)):
			if o.data.shape_keys is not None: found_add(o.data.shape_keys)
		
		for m in o.modifiers:
			if isinstance(m, (bpy.types.MeshSequenceCacheModifier, bpy.types.TransformCacheConstraint)):
				found_add(m.cache_file)
			if isinstance(m, (bpy.types.DisplaceModifier, bpy.types.WarpModifier, bpy.types.WaveModifier)):
				found_add(m.texture)
			if isinstance(m, (bpy.types.VertexWeightEditModifier, bpy.types.VertexWeightMixModifier, bpy.types.VertexWeightProximityModifier)):
				found_add(m.mask_texture)
		
		for ps in o.particle_systems:
			found_add(ps.settings)

	for m in materials:
		if m.node_tree:
			found_add(m.node_tree)
			for n in m.node_tree.nodes:
				if isinstance(n, (bpy.types.CompositorNodeTexture, bpy.types.TextureNodeTexture)):
					textures.add(n.texture)
	
	if context.sequences is not None:
		for s in context.sequences:
			if isinstance(s, bpy.typesMaskSequence) and s.mask: found_add(s.mask)
	
	if hasattr(context, "speaker") and context.speaker is not None:
		found_add(context.speaker)

	for ls in context.view_layer.freestyle_settings.linesets:
		found_add(ls.linestyle)
	
	found.update(materials)
	found.update(textures)

	for f in found:
		if f.animation_data is not None:
			yield f.animation_data