add subscription subsystem

git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@112 fefdeb5f-60dc-0310-8127-8f9354f1896f

11 files changed, 236 insertions, 2 deletions

diff --git a/polyp/Makefile.am b/polyp/Makefile.am
index 254af28a..ce753da4 100644
--- a/polyp/Makefile.am
+++ b/polyp/Makefile.am
@@ -115,7 +115,8 @@ polypaudio_SOURCES = idxset.c idxset.h \
 		sound-file.c sound-file.h \
 		play-memchunk.c play-memchunk.h \
 		autoload.c autoload.h \
-		xmalloc.c xmalloc.h
+		xmalloc.c xmalloc.h \
+		subscribe.h subscribe.c
 
 polypaudio_CFLAGS = $(AM_CFLAGS) $(LIBSAMPLERATE_CFLAGS) $(LIBSNDFILE_CFLAGS)
 polypaudio_INCLUDES = $(INCLTDL)
diff --git a/polyp/client.c b/polyp/client.c
index 83a6264d..809f9761 100644
--- a/polyp/client.c
+++ b/polyp/client.c
@@ -30,6 +30,7 @@
 
 #include "client.h"
 #include "xmalloc.h"
+#include "subscribe.h"
 
 struct pa_client *pa_client_new(struct pa_core *core, const char *protocol_name, char *name) {
     struct pa_client *c;
@@ -49,6 +50,7 @@ struct pa_client *pa_client_new(struct pa_core *core, const char *protocol_name,
     assert(c->index != PA_IDXSET_INVALID && r >= 0);
 
     fprintf(stderr, "client: created %u \"%s\"\n", c->index, c->name);
+    pa_subscription_post(core, PA_SUBSCRIPTION_EVENT_CLIENT|PA_SUBSCRIPTION_EVENT_NEW, c->index);
     
     return c;
 }
@@ -58,6 +60,7 @@ void pa_client_free(struct pa_client *c) {
 
     pa_idxset_remove_by_data(c->core->clients, c, NULL);
     fprintf(stderr, "client: freed %u \"%s\"\n", c->index, c->name);
+    pa_subscription_post(c->core, PA_SUBSCRIPTION_EVENT_CLIENT|PA_SUBSCRIPTION_EVENT_REMOVE, c->index);
     pa_xfree(c->name);
     pa_xfree(c);
 }
diff --git a/polyp/core.c b/polyp/core.c
index 0444fa96..55944aad 100644
--- a/polyp/core.c
+++ b/polyp/core.c
@@ -36,6 +36,7 @@
 #include "scache.h"
 #include "autoload.h"
 #include "xmalloc.h"
+#include "subscribe.h"
 
 struct pa_core* pa_core_new(struct pa_mainloop_api *m) {
     struct pa_core* c;
@@ -63,6 +64,10 @@ struct pa_core* pa_core_new(struct pa_mainloop_api *m) {
 
     c->auto_unload_time = 20;
     c->auto_unload_event = NULL;
+
+    c->subscription_defer_event = NULL;
+    c->subscription_event_queue = NULL;
+    c->subscriptions = NULL;
     
     pa_check_for_sigpipe();
     
@@ -93,7 +98,8 @@ void pa_core_free(struct pa_core *c) {
     pa_namereg_free(c);
     pa_scache_free(c);
     pa_autoload_free(c);
-
+    pa_subscription_free_all(c);
+    
     pa_xfree(c->default_source_name);
     pa_xfree(c->default_sink_name);
     
diff --git a/polyp/core.h b/polyp/core.h
index e1e48cbc..43691771 100644
--- a/polyp/core.h
+++ b/polyp/core.h
@@ -39,6 +39,10 @@ struct pa_core {
     struct pa_sample_spec default_sample_spec;
     int auto_unload_time;
     struct pa_time_event *auto_unload_event;
+
+    struct pa_defer_event *subscription_defer_event;
+    struct pa_queue *subscription_event_queue;
+    struct pa_subscription *subscriptions;
 };
 
 struct pa_core* pa_core_new(struct pa_mainloop_api *m);
diff --git a/polyp/module.c b/polyp/module.c
index 83bfa800..849afca4 100644
--- a/polyp/module.c
+++ b/polyp/module.c
@@ -32,6 +32,7 @@
 
 #include "module.h"
 #include "xmalloc.h"
+#include "subscribe.h"
 
 #define UNLOAD_POLL_TIME 10
 
@@ -92,6 +93,8 @@ struct pa_module* pa_module_load(struct pa_core *c, const char *name, const char
     assert(r >= 0 && m->index != PA_IDXSET_INVALID);
 
     fprintf(stderr, "module: loaded %u \"%s\" with argument \"%s\".\n", m->index, m->name, m->argument);
+
+    pa_subscription_post(c, PA_SUBSCRIPTION_EVENT_MODULE|PA_SUBSCRIPTION_EVENT_NEW, m->index);
     
     return m;
     
@@ -117,6 +120,8 @@ static void pa_module_free(struct pa_module *m) {
     
     fprintf(stderr, "module: unloaded %u \"%s\".\n", m->index, m->name);
 
+    pa_subscription_post(m->core, PA_SUBSCRIPTION_EVENT_MODULE|PA_SUBSCRIPTION_EVENT_REMOVE, m->index);
+    
     pa_xfree(m->name);
     pa_xfree(m->argument);
     pa_xfree(m);
diff --git a/polyp/sink-input.c b/polyp/sink-input.c
index 04a2f020..dd7469e0 100644
--- a/polyp/sink-input.c
+++ b/polyp/sink-input.c
@@ -31,6 +31,7 @@
 #include "sink-input.h"
 #include "sample-util.h"
 #include "xmalloc.h"
+#include "subscribe.h"
 
 #define CONVERT_BUFFER_LENGTH 4096
 
@@ -72,6 +73,8 @@ struct pa_sink_input* pa_sink_input_new(struct pa_sink *s, const char *name, con
 
     pa_sample_snprint(st, sizeof(st), spec);
     fprintf(stderr, "sink-input: created %u \"%s\" on %u with sample spec \"%s\"\n", i->index, i->name, s->index, st);
+
+    pa_subscription_post(s->core, PA_SUBSCRIPTION_EVENT_SINK_INPUT|PA_SUBSCRIPTION_EVENT_NEW, i->index);
     
     return i;    
 }
@@ -87,6 +90,8 @@ void pa_sink_input_free(struct pa_sink_input* i) {
         pa_memblock_unref(i->resampled_chunk.memblock);
     if (i->resampler)
         pa_resampler_free(i->resampler);
+
+    pa_subscription_post(i->sink->core, PA_SUBSCRIPTION_EVENT_SINK_INPUT|PA_SUBSCRIPTION_EVENT_REMOVE, i->index);
     
     pa_xfree(i->name);
     pa_xfree(i);
diff --git a/polyp/sink.c b/polyp/sink.c
index 9628d8bd..7e0e15cd 100644
--- a/polyp/sink.c
+++ b/polyp/sink.c
@@ -34,6 +34,7 @@
 #include "util.h"
 #include "sample-util.h"
 #include "xmalloc.h"
+#include "subscribe.h"
 
 #define MAX_MIX_CHANNELS 32
 
@@ -77,6 +78,8 @@ struct pa_sink* pa_sink_new(struct pa_core *core, const char *name, int fail, co
     
     pa_sample_snprint(st, sizeof(st), spec);
     fprintf(stderr, "sink: created %u \"%s\" with sample spec \"%s\"\n", s->index, s->name, st);
+
+    pa_subscription_post(core, PA_SUBSCRIPTION_EVENT_SINK | PA_SUBSCRIPTION_EVENT_NEW, s->index);
     
     return s;
 }
@@ -98,6 +101,8 @@ void pa_sink_free(struct pa_sink *s) {
     pa_idxset_remove_by_data(s->core->sinks, s, NULL);
 
     fprintf(stderr, "sink: freed %u \"%s\"\n", s->index, s->name);
+
+    pa_subscription_post(s->core, PA_SUBSCRIPTION_EVENT_SINK | PA_SUBSCRIPTION_EVENT_REMOVE, s->index);
     
     pa_xfree(s->name);
     pa_xfree(s->description);
diff --git a/polyp/source-output.c b/polyp/source-output.c
index 07901fa8..c53831c7 100644
--- a/polyp/source-output.c
+++ b/polyp/source-output.c
@@ -29,6 +29,7 @@
 
 #include "source-output.h"
 #include "xmalloc.h"
+#include "subscribe.h"
 
 struct pa_source_output* pa_source_output_new(struct pa_source *s, const char *name, const struct pa_sample_spec *spec) {
     struct pa_source_output *o;
@@ -57,6 +58,8 @@ struct pa_source_output* pa_source_output_new(struct pa_source *s, const char *n
     assert(r == 0 && o->index != PA_IDXSET_INVALID);
     r = pa_idxset_put(s->outputs, o, NULL);
     assert(r == 0);
+
+    pa_subscription_post(s->core, PA_SUBSCRIPTION_EVENT_SOURCE_OUTPUT|PA_SUBSCRIPTION_EVENT_NEW, o->index);
     
     return o;    
 }
@@ -70,6 +73,8 @@ void pa_source_output_free(struct pa_source_output* o) {
 
     if (o->resampler)
         pa_resampler_free(o->resampler);
+
+    pa_subscription_post(o->source->core, PA_SUBSCRIPTION_EVENT_SOURCE_OUTPUT|PA_SUBSCRIPTION_EVENT_REMOVE, o->index);
     
     pa_xfree(o->name);
     pa_xfree(o);
diff --git a/polyp/source.c b/polyp/source.c
index 65c90e9a..2c611651 100644
--- a/polyp/source.c
+++ b/polyp/source.c
@@ -32,6 +32,7 @@
 #include "source-output.h"
 #include "namereg.h"
 #include "xmalloc.h"
+#include "subscribe.h"
 
 struct pa_source* pa_source_new(struct pa_core *core, const char *name, int fail, const struct pa_sample_spec *spec) {
     struct pa_source *s;
@@ -63,6 +64,8 @@ struct pa_source* pa_source_new(struct pa_core *core, const char *name, int fail
 
     pa_sample_snprint(st, sizeof(st), spec);
     fprintf(stderr, "source: created %u \"%s\" with sample spec \"%s\"\n", s->index, s->name, st);
+
+    pa_subscription_post(core, PA_SUBSCRIPTION_EVENT_SOURCE | PA_SUBSCRIPTION_EVENT_NEW, s->index);
     
     return s;
 }
@@ -84,6 +87,8 @@ void pa_source_free(struct pa_source *s) {
 
     fprintf(stderr, "source: freed %u \"%s\"\n", s->index, s->name);
 
+    pa_subscription_post(s->core, PA_SUBSCRIPTION_EVENT_SOURCE | PA_SUBSCRIPTION_EVENT_REMOVE, s->index);
+    
     pa_xfree(s->name);
     pa_xfree(s->description);
     pa_xfree(s);
diff --git a/polyp/subscribe.c b/polyp/subscribe.c
new file mode 100644
index 00000000..541657ae
--- /dev/null
+++ b/polyp/subscribe.c
@@ -0,0 +1,152 @@
+#include <stdio.h>
+#include <assert.h>
+
+#include "queue.h"
+#include "subscribe.h"
+#include "xmalloc.h"
+
+struct pa_subscription {
+    struct pa_core *core;
+    int dead;
+    void (*callback)(struct pa_core *c, enum pa_subscription_event_type t, uint32_t index, void *userdata);
+    void *userdata;
+    enum pa_subscription_mask mask;
+
+    struct pa_subscription *prev, *next;
+};
+
+struct pa_subscription_event {
+    enum pa_subscription_event_type type;
+    uint32_t index;
+};
+
+static void sched_event(struct pa_core *c);
+
+struct pa_subscription* pa_subscription_new(struct pa_core *c, enum pa_subscription_mask m, void (*callback)(struct pa_core *c, enum pa_subscription_event_type t, uint32_t index, void *userdata), void *userdata) {
+    struct pa_subscription *s;
+    assert(c);
+
+    s = pa_xmalloc(sizeof(struct pa_subscription));
+    s->core = c;
+    s->dead = 0;
+    s->callback = callback;
+    s->userdata = userdata;
+    s->mask = m;
+
+    if ((s->next = c->subscriptions))
+        s->next->prev = s;
+    s->prev = NULL;
+    c->subscriptions = s;
+    return NULL;
+}
+
+void pa_subscription_free(struct pa_subscription*s) {
+    assert(s && !s->dead);
+    s->dead = 1;
+    sched_event(s->core);
+}
+
+static void free_item(struct pa_subscription *s) {
+    assert(s && s->core);
+
+    if (s->prev)
+        s->prev->next = s->next;
+    else
+        s->core->subscriptions = s->next;
+            
+    if (s->next)
+        s->next->prev = s->prev;
+    
+    pa_xfree(s);
+}
+
+void pa_subscription_free_all(struct pa_core *c) {
+    struct pa_subscription_event *e;
+    assert(c);
+    
+    while (c->subscriptions)
+        free_item(c->subscriptions);
+
+    if (c->subscription_event_queue) {
+        while ((e = pa_queue_pop(c->subscription_event_queue)))
+            pa_xfree(e);
+        
+        pa_queue_free(c->subscription_event_queue, NULL, NULL);
+        c->subscription_event_queue = NULL;
+    }
+
+    if (c->subscription_defer_event) {
+        c->mainloop->defer_free(c->subscription_defer_event);
+        c->subscription_defer_event = NULL;
+    }
+}
+
+static void defer_cb(struct pa_mainloop_api *m, struct pa_defer_event *e, void *userdata) {
+    struct pa_core *c = userdata;
+    struct pa_subscription *s;
+    assert(c && c->subscription_defer_event == e && c->mainloop == m);
+
+    c->mainloop->defer_enable(c->subscription_defer_event, 0);
+
+
+    /* Dispatch queued events */
+    
+    if (c->subscription_event_queue) {
+        struct pa_subscription_event *e;
+        
+        while ((e = pa_queue_pop(c->subscription_event_queue))) {
+            struct pa_subscription *s;
+
+            for (s = c->subscriptions; s; s = s->next) {
+                if (!s->dead && pa_subscription_match_flags(s->mask, e->type))
+                    s->callback(c, e->type, e->index, s->userdata);
+            }
+            
+            pa_xfree(e);
+        }
+    }
+
+    /* Remove dead subscriptions */
+    
+    s = c->subscriptions;
+    while (s) {
+        struct pa_subscription *n = s->next;
+        if (s->dead)
+            free_item(s);
+        s = n;
+    }
+}
+
+static void sched_event(struct pa_core *c) {
+    assert(c);
+    
+    if (!c->subscription_defer_event) {
+        c->subscription_defer_event = c->mainloop->defer_new(c->mainloop, defer_cb, c);
+        assert(c->subscription_defer_event);
+    }
+        
+    c->mainloop->defer_enable(c->subscription_defer_event, 1);
+}
+
+
+void pa_subscription_post(struct pa_core *c, enum pa_subscription_event_type t, uint32_t index) {
+    struct pa_subscription_event *e;
+    assert(c);
+
+    e = pa_xmalloc(sizeof(struct pa_subscription_event));
+    e->type = t;
+    e->index = index;
+
+    if (!c->subscription_event_queue) {
+        c->subscription_event_queue = pa_queue_new();
+        assert(c->subscription_event_queue);
+    }
+    
+    pa_queue_push(c->subscription_event_queue, e);
+    sched_event(c);
+}
+
+
+int pa_subscription_match_flags(enum pa_subscription_mask m, enum pa_subscription_event_type t) {
+    return !!(m & (1 >> (t & PA_SUBSCRIPTION_EVENT_FACILITY_MASK)));
+}
diff --git a/polyp/subscribe.h b/polyp/subscribe.h
new file mode 100644
index 00000000..1561249f
--- /dev/null
+++ b/polyp/subscribe.h
@@ -0,0 +1,43 @@
+#ifndef foosubscribehfoo
+#define foosubscribehfoo
+
+#include "core.h"
+
+enum pa_subscription_mask {
+    PA_SUBSCRIPTION_FACILITY_SINK = 1,
+    PA_SUBSCRIPTION_FACILITY_SOURCE = 2,
+    PA_SUBSCRIPTION_FACILITY_SINK_INPUT = 4,
+    PA_SUBSCRIPTION_FACILITY_SOURCE_OUTPUT = 8,
+    PA_SUBSCRIPTION_FACILITY_MODULE = 16,
+    PA_SUBSCRIPTION_FACILITY_CLIENT = 32,
+    PA_SUBSCRIPTION_FACILITY_SAMPLE_CACHE = 64,
+};
+
+enum pa_subscription_event_type {
+    PA_SUBSCRIPTION_EVENT_SINK = 0,
+    PA_SUBSCRIPTION_EVENT_SOURCE = 1,
+    PA_SUBSCRIPTION_EVENT_SINK_INPUT = 2,
+    PA_SUBSCRIPTION_EVENT_SOURCE_OUTPUT = 3,
+    PA_SUBSCRIPTION_EVENT_MODULE = 4,
+    PA_SUBSCRIPTION_EVENT_CLIENT = 5,
+    PA_SUBSCRIPTION_EVENT_SAMPLE_CACHE = 6,
+    PA_SUBSCRIPTION_EVENT_FACILITY_MASK = 7,
+
+    PA_SUBSCRIPTION_EVENT_NEW = 0,
+    PA_SUBSCRIPTION_EVENT_CHANGE = 16,
+    PA_SUBSCRIPTION_EVENT_REMOVE = 32,
+    PA_SUBSCRIPTION_EVENT_TYPE_MASK = 16+32,
+};
+    
+struct pa_subscription;
+struct pa_subscription_event;
+
+struct pa_subscription* pa_subscription_new(struct pa_core *c, enum pa_subscription_mask m,  void (*callback)(struct pa_core *c, enum pa_subscription_event_type t, uint32_t index, void *userdata), void *userdata);
+void pa_subscription_free(struct pa_subscription*s);
+void pa_subscription_free_all(struct pa_core *c);
+
+void pa_subscription_post(struct pa_core *c, enum pa_subscription_event_type t, uint32_t index);
+
+int pa_subscription_match_flags(enum pa_subscription_mask m, enum pa_subscription_event_type e);
+
+#endif