graph.h

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/* Simple Plugin API */
/* SPDX-FileCopyrightText: Copyright © 2018 Wim Taymans */
/* SPDX-License-Identifier: MIT */
 
#ifndef SPA_GRAPH_H
#define SPA_GRAPH_H
 
#ifdef __cplusplus
extern "C" {
#endif
 
#include <spa/utils/defs.h>
#include <spa/utils/list.h>
#include <spa/utils/hook.h>
#include <spa/node/node.h>
#include <spa/node/io.h>
 
#ifndef spa_debug
#define spa_debug(...)
#endif
 
struct spa_graph;
struct spa_graph_node;
struct spa_graph_link;
struct spa_graph_port;
 
struct spa_graph_state {
        int status;                     
        int32_t required;               
        int32_t pending;                
};
 
static inline void spa_graph_state_reset(struct spa_graph_state *state)
{
        state->pending = state->required;
}
 
struct spa_graph_link {
        struct spa_list link;
        struct spa_graph_state *state;
        int (*signal) (void *data);
        void *signal_data;
};
 
#define spa_graph_link_signal(l)        ((l)->signal((l)->signal_data))
 
#define spa_graph_state_dec(s,c) (__atomic_sub_fetch(&(s)->pending, c, __ATOMIC_SEQ_CST) == 0)
 
static inline int spa_graph_link_trigger(struct spa_graph_link *link)
{
        struct spa_graph_state *state = link->state;
 
        spa_debug("link %p: state %p: pending %d/%d", link, state,
                        state->pending, state->required);
 
        if (spa_graph_state_dec(state, 1))
                spa_graph_link_signal(link);
 
        return state->status;
}
struct spa_graph {
        uint32_t flags;                 /* flags */
        struct spa_graph_node *parent;  /* parent node or NULL when driver */
        struct spa_graph_state *state;  /* state of graph */
        struct spa_list nodes;          /* list of nodes of this graph */
};
 
struct spa_graph_node_callbacks {
#define SPA_VERSION_GRAPH_NODE_CALLBACKS        0
        uint32_t version;
 
        int (*process) (void *data, struct spa_graph_node *node);
        int (*reuse_buffer) (void *data, struct spa_graph_node *node,
                        uint32_t port_id, uint32_t buffer_id);
};
 
struct spa_graph_node {
        struct spa_list link;           
        struct spa_graph *graph;        
        struct spa_list ports[2];       
        struct spa_list links;          
        uint32_t flags;                 
        struct spa_graph_state *state;  
        struct spa_graph_link graph_link;       
        struct spa_graph *subgraph;     
        struct spa_callbacks callbacks;
        struct spa_list sched_link;     
};
 
#define spa_graph_node_call(n,method,version,...)                       \
({                                                                      \
        int __res = 0;                                                  \
        spa_callbacks_call_res(&(n)->callbacks,                         \
                        struct spa_graph_node_callbacks, __res,         \
                        method, (version), ##__VA_ARGS__);              \
        __res;                                                          \
})
 
#define spa_graph_node_process(n)               spa_graph_node_call((n), process, 0, (n))
#define spa_graph_node_reuse_buffer(n,p,i)      spa_graph_node_call((n), reuse_buffer, 0, (n), (p), (i))
 
struct spa_graph_port {
        struct spa_list link;           
        struct spa_graph_node *node;    
        enum spa_direction direction;   
        uint32_t port_id;               
        uint32_t flags;                 
        struct spa_graph_port *peer;    
};
 
static inline int spa_graph_node_trigger(struct spa_graph_node *node)
{
        struct spa_graph_link *l;
        spa_debug("node %p trigger", node);
        spa_list_for_each(l, &node->links, link)
                spa_graph_link_trigger(l);
        return 0;
}
 
static inline int spa_graph_run(struct spa_graph *graph)
{
        struct spa_graph_node *n, *t;
        struct spa_list pending;
 
        spa_graph_state_reset(graph->state);
        spa_debug("graph %p run with state %p pending %d/%d", graph, graph->state,
                        graph->state->pending, graph->state->required);
 
        spa_list_init(&pending);
 
        spa_list_for_each(n, &graph->nodes, link) {
                struct spa_graph_state *s = n->state;
                spa_graph_state_reset(s);
                spa_debug("graph %p node %p: state %p pending %d/%d status %d", graph, n,
                                s, s->pending, s->required, s->status);
                if (--s->pending == 0)
                        spa_list_append(&pending, &n->sched_link);
        }
        spa_list_for_each_safe(n, t, &pending, sched_link)
                spa_graph_node_process(n);
 
        return 0;
}
 
static inline int spa_graph_finish(struct spa_graph *graph)
{
        spa_debug("graph %p finish", graph);
        if (graph->parent)
                return spa_graph_node_trigger(graph->parent);
        return 0;
}
static inline int spa_graph_link_signal_node(void *data)
{
        struct spa_graph_node *node = (struct spa_graph_node *)data;
        spa_debug("node %p call process", node);
        return spa_graph_node_process(node);
}
 
static inline int spa_graph_link_signal_graph(void *data)
{
        struct spa_graph_node *node = (struct spa_graph_node *)data;
        return spa_graph_finish(node->graph);
}
 
static inline void spa_graph_init(struct spa_graph *graph, struct spa_graph_state *state)
{
        spa_list_init(&graph->nodes);
        graph->flags = 0;
        graph->state = state;
        spa_debug("graph %p init state %p", graph, state);
}
 
static inline void
spa_graph_link_add(struct spa_graph_node *out,
                   struct spa_graph_state *state,
                   struct spa_graph_link *link)
{
        link->state = state;
        state->required++;
        spa_debug("node %p add link %p to state %p %d", out, link, state, state->required);
        spa_list_append(&out->links, &link->link);
}
 
static inline void spa_graph_link_remove(struct spa_graph_link *link)
{
        link->state->required--;
        spa_debug("link %p state %p remove %d", link, link->state, link->state->required);
        spa_list_remove(&link->link);
}
 
static inline void
spa_graph_node_init(struct spa_graph_node *node, struct spa_graph_state *state)
{
        spa_list_init(&node->ports[SPA_DIRECTION_INPUT]);
        spa_list_init(&node->ports[SPA_DIRECTION_OUTPUT]);
        spa_list_init(&node->links);
        node->flags = 0;
        node->subgraph = NULL;
        node->state = state;
        node->state->required = node->state->pending = 0;
        node->state->status = SPA_STATUS_OK;
        node->graph_link.signal = spa_graph_link_signal_graph;
        node->graph_link.signal_data = node;
        spa_debug("node %p init state %p", node, state);
}
 
 
static inline int spa_graph_node_impl_sub_process(void *data, struct spa_graph_node *node)
{
        struct spa_graph *graph = node->subgraph;
        spa_debug("node %p: sub process %p", node, graph);
        return spa_graph_run(graph);
}
 
static const struct spa_graph_node_callbacks spa_graph_node_sub_impl_default = {
        SPA_VERSION_GRAPH_NODE_CALLBACKS,
        .process = spa_graph_node_impl_sub_process,
};
 
static inline void spa_graph_node_set_subgraph(struct spa_graph_node *node,
                struct spa_graph *subgraph)
{
        node->subgraph = subgraph;
        subgraph->parent = node;
        spa_debug("node %p set subgraph %p", node, subgraph);
}
 
static inline void
spa_graph_node_set_callbacks(struct spa_graph_node *node,
                const struct spa_graph_node_callbacks *callbacks,
                void *data)
{
        node->callbacks = SPA_CALLBACKS_INIT(callbacks, data);
}
 
static inline void
spa_graph_node_add(struct spa_graph *graph,
                   struct spa_graph_node *node)
{
        node->graph = graph;
        spa_list_append(&graph->nodes, &node->link);
        node->state->required++;
        spa_debug("node %p add to graph %p, state %p required %d",
                        node, graph, node->state, node->state->required);
        spa_graph_link_add(node, graph->state, &node->graph_link);
}
 
static inline void spa_graph_node_remove(struct spa_graph_node *node)
{
        spa_debug("node %p remove from graph %p, state %p required %d",
                        node, node->graph, node->state, node->state->required);
        spa_graph_link_remove(&node->graph_link);
        node->state->required--;
        spa_list_remove(&node->link);
}
 
 
static inline void
spa_graph_port_init(struct spa_graph_port *port,
                    enum spa_direction direction,
                    uint32_t port_id,
                    uint32_t flags)
{
        spa_debug("port %p init type %d id %d", port, direction, port_id);
        port->direction = direction;
        port->port_id = port_id;
        port->flags = flags;
}
 
static inline void
spa_graph_port_add(struct spa_graph_node *node,
                   struct spa_graph_port *port)
{
        spa_debug("port %p add to node %p", port, node);
        port->node = node;
        spa_list_append(&node->ports[port->direction], &port->link);
}
 
static inline void spa_graph_port_remove(struct spa_graph_port *port)
{
        spa_debug("port %p remove", port);
        spa_list_remove(&port->link);
}
 
static inline void
spa_graph_port_link(struct spa_graph_port *out, struct spa_graph_port *in)
{
        spa_debug("port %p link to %p %p %p", out, in, in->node, in->node->state);
        out->peer = in;
        in->peer = out;
}
 
static inline void
spa_graph_port_unlink(struct spa_graph_port *port)
{
        spa_debug("port %p unlink from %p", port, port->peer);
        if (port->peer) {
                port->peer->peer = NULL;
                port->peer = NULL;
        }
}
 
static inline int spa_graph_node_impl_process(void *data, struct spa_graph_node *node)
{
        struct spa_node *n = (struct spa_node *)data;
        struct spa_graph_state *state = node->state;
 
        spa_debug("node %p: process state %p: %d, node %p", node, state, state->status, n);
        if ((state->status = spa_node_process(n)) != SPA_STATUS_OK)
                spa_graph_node_trigger(node);
 
        return state->status;
}
 
static inline int spa_graph_node_impl_reuse_buffer(void *data, struct spa_graph_node *node,
                uint32_t port_id, uint32_t buffer_id)
{
        struct spa_node *n = (struct spa_node *)data;
        return spa_node_port_reuse_buffer(n, port_id, buffer_id);
}
 
static const struct spa_graph_node_callbacks spa_graph_node_impl_default = {
        SPA_VERSION_GRAPH_NODE_CALLBACKS,
        .process = spa_graph_node_impl_process,
        .reuse_buffer = spa_graph_node_impl_reuse_buffer,
};
 
#ifdef __cplusplus
}  /* extern "C" */
#endif
 
#endif /* SPA_GRAPH_H */