From 1cbf63996a51a67bdd221257d74adec61f03ea32 Mon Sep 17 00:00:00 2001
From: cbdev <cb@cbcdn.com>
Date: Tue, 6 Jun 2017 00:08:06 +0200
Subject: Implement MIDI backend event fetching

---
 midimonster.h | 27 ++++++++++++++++++++-------
 1 file changed, 20 insertions(+), 7 deletions(-)

(limited to 'midimonster.h')

diff --git a/midimonster.h b/midimonster.h
index d548528..bd42d8f 100644
--- a/midimonster.h
+++ b/midimonster.h
@@ -10,21 +10,24 @@
 struct _channel_value;
 struct _backend_channel;
 struct _backend_instance;
+struct _managed_fd;
 
-typedef int (*mmbackend_handle_event)(size_t channels, struct _backend_channel* c, struct _channel_value* v);
+typedef int (*mmbackend_handle_event)(struct _backend_instance* inst, size_t channels, struct _backend_channel* c, struct _channel_value* v);
 typedef struct _backend_instance* (*mmbackend_create_instance)();
 typedef struct _backend_channel* (*mmbackend_parse_channel)(struct _backend_instance* instance, char* spec);
 typedef void (*mmbackend_free_channel)(struct _backend_channel* c);
 typedef int (*mmbackend_configure)(char* option, char* value);
 typedef int (*mmbackend_configure_instance)(struct _backend_instance* instance, char* option, char* value);
-typedef int (*mmbackend_process_fd)(size_t fds, int* fd, void** impl);
+typedef int (*mmbackend_process_fd)(size_t nfds, struct _managed_fd* fds);
 typedef int (*mmbackend_start)();
-typedef uint32_t (*mmbackend_max_interval)();
+typedef uint32_t (*mmbackend_interval)();
 typedef int (*mmbackend_shutdown)();
 
 typedef struct _channel_value {
-	double raw_double;
-	uint64_t raw_u64;
+	union {
+		double dbl;
+		uint64_t u64;
+	} raw;
 	double normalised;
 } channel_value;
 
@@ -39,11 +42,12 @@ typedef struct /*_mm_backend*/ {
 	mmbackend_start start;
 	mmbackend_shutdown shutdown;
 	mmbackend_free_channel channel_free;
+	mmbackend_interval interval;
 } backend;
 
 typedef struct _backend_instance {
 	backend* backend;
-	uint64_t ident; /*FIXME needed? identification provided by name*/
+	uint64_t ident;
 	void* impl;
 	char* name;
 } instance;
@@ -56,7 +60,7 @@ typedef struct _backend_channel {
 
 //FIXME might be replaced by struct pollfd
 //FIXME who frees impl
-typedef struct /*_mm_managed_fd*/ {
+typedef struct _managed_fd {
 	int fd;
 	backend* backend;
 	void* impl;
@@ -86,6 +90,14 @@ int mm_backend_register(backend b);
  * all instances for the backend.
  */
 instance* mm_instance();
+/*
+ * Finds an instance matching the specified backend and identifier.
+ * Since setting an identifier for an instance is optional,
+ * this may not work depending on the backend.
+ * Instance identifiers may for example be set in the backends
+ * mmbackend_start call.
+ */
+instance* mm_instance_find(char* backend, uint64_t ident);
 /*
  * Provides a pointer to a channel structure, pre-filled with
  * the provided instance reference and identifier.
@@ -109,6 +121,7 @@ int mm_manage_fd(int fd, char* backend, int manage, void* impl);
 int mm_channel_event(channel* c, channel_value v);
 /*
  * Query all active instances for a given backend.
+ * *i will need to be freed by the caller.
  */
 int mm_backend_instances(char* backend, size_t* n, instance*** i);
 int mm_map_channel(channel* from, channel* to);
-- 
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