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	add node set_io function
Also allow setting io areas on nodes. We need this to set the graph clock and period size on the nodes.
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					 22 changed files with 157 additions and 0 deletions
				
			
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			@ -239,6 +239,11 @@ static int impl_node_set_param(struct spa_node *node, uint32_t id, uint32_t flag
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	return res;
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}
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static int impl_node_set_io(struct spa_node *node, uint32_t id, void *data, size_t size)
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{
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	return -ENOTSUP;
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}
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static int impl_node_send_command(struct spa_node *node, const struct spa_command *command)
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{
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	struct node *this;
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			@ -890,6 +895,7 @@ static const struct spa_node impl_node = {
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	NULL,
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	impl_node_enum_params,
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	impl_node_set_param,
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	impl_node_set_io,
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	impl_node_send_command,
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	impl_node_set_callbacks,
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	impl_node_get_n_ports,
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