1 files changed, 333 insertions, 219 deletions

diff --git a/src/modules/module-combine.c b/src/modules/module-combine.c
index d50e59ae..582cbce1 100644
--- a/src/modules/module-combine.c
+++ b/src/modules/module-combine.c
@@ -92,6 +92,8 @@ struct output {
     pa_sink *sink;
     pa_sink_input *sink_input;
 
+    pa_bool_t ignore_state_change;
+
     pa_asyncmsgq *inq,    /* Message queue from the sink thread to this sink input */
                  *outq;   /* Message queue from this sink input to the sink thread */
     pa_rtpoll_item *inq_rtpoll_item_read, *inq_rtpoll_item_write;
@@ -99,9 +101,12 @@ struct output {
 
     pa_memblockq *memblockq;
 
+    /* For communication of the stream latencies to the main thread */
     pa_usec_t total_latency;
 
+    /* For coomunication of the stream parameters to the sink thread */
     pa_atomic_t max_request;
+    pa_atomic_t requested_latency;
 
     PA_LLIST_FIELDS(struct output);
 };
@@ -119,13 +124,12 @@ struct userdata {
     uint32_t adjust_time;
 
     pa_bool_t automatic;
+    pa_bool_t auto_desc;
 
     pa_hook_slot *sink_put_slot, *sink_unlink_slot, *sink_state_changed_slot;
 
     pa_resample_method_t resample_method;
 
-    struct timeval adjust_timestamp;
-
     pa_usec_t block_usec;
 
     pa_idxset* outputs; /* managed in main context */
@@ -145,13 +149,16 @@ enum {
     SINK_MESSAGE_REMOVE_OUTPUT,
     SINK_MESSAGE_NEED,
     SINK_MESSAGE_UPDATE_LATENCY,
-    SINK_MESSAGE_UPDATE_MAX_REQUEST
+    SINK_MESSAGE_UPDATE_MAX_REQUEST,
+    SINK_MESSAGE_UPDATE_REQUESTED_LATENCY
 };
 
 enum {
     SINK_INPUT_MESSAGE_POST = PA_SINK_INPUT_MESSAGE_MAX,
 };
 
+static void output_disable(struct output *o);
+static void output_enable(struct output *o);
 static void output_free(struct output *o);
 static int output_create_sink_input(struct output *o);
 
@@ -171,7 +178,7 @@ static void adjust_rates(struct userdata *u) {
     if (!PA_SINK_IS_OPENED(pa_sink_get_state(u->sink)))
         return;
 
-    for (o = pa_idxset_first(u->outputs, &idx); o; o = pa_idxset_next(u->outputs, &idx)) {
+    PA_IDXSET_FOREACH(o, u->outputs, idx) {
         pa_usec_t sink_latency;
 
         if (!o->sink_input || !PA_SINK_IS_OPENED(pa_sink_get_state(o->sink)))
@@ -188,6 +195,11 @@ static void adjust_rates(struct userdata *u) {
 
         avg_total_latency += o->total_latency;
         n++;
+
+        pa_log_debug("[%s] total=%0.2fms sink=%0.2fms ", o->sink->name, (double) o->total_latency / PA_USEC_PER_MSEC, (double) sink_latency / PA_USEC_PER_MSEC);
+
+        if (o->total_latency > 10*PA_USEC_PER_SEC)
+            pa_log_warn("[%s] Total latency of output is very high (%0.2fms), most likely the audio timing in one of your drivers is broken.", o->sink->name, (double) o->total_latency / PA_USEC_PER_MSEC);
     }
 
     if (min_total_latency == (pa_usec_t) -1)
@@ -202,7 +214,7 @@ static void adjust_rates(struct userdata *u) {
 
     base_rate = u->sink->sample_spec.rate;
 
-    for (o = pa_idxset_first(u->outputs, &idx); o; o = pa_idxset_next(u->outputs, &idx)) {
+    PA_IDXSET_FOREACH(o, u->outputs, idx) {
         uint32_t r = base_rate;
 
         if (!o->sink_input || !PA_SINK_IS_OPENED(pa_sink_get_state(o->sink)))
@@ -214,10 +226,10 @@ static void adjust_rates(struct userdata *u) {
             r += (uint32_t) ((((double) (o->total_latency - target_latency))/(double)u->adjust_time)*(double)r/PA_USEC_PER_SEC);
 
         if (r < (uint32_t) (base_rate*0.9) || r > (uint32_t) (base_rate*1.1)) {
-            pa_log_warn("[%s] sample rates too different, not adjusting (%u vs. %u).", pa_proplist_gets(o->sink_input->proplist, PA_PROP_MEDIA_NAME), base_rate, r);
+            pa_log_warn("[%s] sample rates too different, not adjusting (%u vs. %u).", o->sink_input->sink->name, base_rate, r);
             pa_sink_input_set_rate(o->sink_input, base_rate);
         } else {
-            pa_log_info("[%s] new rate is %u Hz; ratio is %0.3f; latency is %0.0f usec.", pa_proplist_gets(o->sink_input->proplist, PA_PROP_MEDIA_NAME), r, (double) r / base_rate, (float) o->total_latency);
+            pa_log_info("[%s] new rate is %u Hz; ratio is %0.3f; latency is %0.0f usec.", o->sink_input->sink->name, r, (double) r / base_rate, (float) o->total_latency);
             pa_sink_input_set_rate(o->sink_input, r);
         }
     }
@@ -354,18 +366,15 @@ static void render_memblock(struct userdata *u, struct output *o, size_t length)
         u->thread_info.counter += chunk.length;
 
         /* OK, let's send this data to the other threads */
-        for (j = u->thread_info.active_outputs; j; j = j->next)
-
-            /* Send to other outputs, which are not the requesting
-             * one */
+        PA_LLIST_FOREACH(j, u->thread_info.active_outputs) {
+            if (j == o)
+                continue;
 
-            if (j != o)
-                pa_asyncmsgq_post(j->inq, PA_MSGOBJECT(j->sink_input), SINK_INPUT_MESSAGE_POST, NULL, 0, &chunk, NULL);
+            pa_asyncmsgq_post(j->inq, PA_MSGOBJECT(j->sink_input), SINK_INPUT_MESSAGE_POST, NULL, 0, &chunk, NULL);
+        }
 
         /* And place it directly into the requesting output's queue */
-        if (o)
-            pa_memblockq_push_align(o->memblockq, &chunk);
-
+        pa_memblockq_push_align(o->memblockq, &chunk);
         pa_memblock_unref(chunk.memblock);
     }
 }
@@ -401,10 +410,18 @@ static int sink_input_pop_cb(pa_sink_input *i, size_t nbytes, pa_memchunk *chunk
     /* If necessary, get some new data */
     request_memblock(o, nbytes);
 
+    /* pa_log("%s q size is %u + %u (%u/%u)", */
+    /*        i->sink->name, */
+    /*        pa_memblockq_get_nblocks(o->memblockq), */
+    /*        pa_memblockq_get_nblocks(i->thread_info.render_memblockq), */
+    /*        pa_memblockq_get_maxrewind(o->memblockq), */
+    /*        pa_memblockq_get_maxrewind(i->thread_info.render_memblockq)); */
+
     if (pa_memblockq_peek(o->memblockq, chunk) < 0)
         return -1;
 
     pa_memblockq_drop(o->memblockq, chunk->length);
+
     return 0;
 }
 
@@ -439,13 +456,35 @@ static void sink_input_update_max_request_cb(pa_sink_input *i, size_t nbytes) {
         return;
 
     pa_atomic_store(&o->max_request, (int) nbytes);
-
     pa_asyncmsgq_post(o->outq, PA_MSGOBJECT(o->userdata->sink), SINK_MESSAGE_UPDATE_MAX_REQUEST, NULL, 0, NULL, NULL);
 }
 
+/* Called from thread context */
+static void sink_input_update_sink_requested_latency_cb(pa_sink_input *i) {
+    struct output *o;
+    pa_usec_t c;
+
+    pa_assert(i);
+
+    pa_sink_input_assert_ref(i);
+    pa_assert_se(o = i->userdata);
+
+    c = pa_sink_get_requested_latency_within_thread(i->sink);
+
+    if (c == (pa_usec_t) -1)
+        c = i->sink->thread_info.max_latency;
+
+    if (pa_atomic_load(&o->requested_latency) == (int) c)
+        return;
+
+    pa_atomic_store(&o->requested_latency, (int) c);
+    pa_asyncmsgq_post(o->outq, PA_MSGOBJECT(o->userdata->sink), SINK_MESSAGE_UPDATE_REQUESTED_LATENCY, NULL, 0, NULL, NULL);
+}
+
 /* Called from I/O thread context */
 static void sink_input_attach_cb(pa_sink_input *i) {
     struct output *o;
+    pa_usec_t c;
 
     pa_sink_input_assert_ref(i);
     pa_assert_se(o = i->userdata);
@@ -454,14 +493,24 @@ static void sink_input_attach_cb(pa_sink_input *i) {
     pa_assert(!o->inq_rtpoll_item_read && !o->outq_rtpoll_item_write);
 
     o->inq_rtpoll_item_read = pa_rtpoll_item_new_asyncmsgq_read(
-            i->sink->rtpoll,
+            i->sink->thread_info.rtpoll,
             PA_RTPOLL_LATE,  /* This one is not that important, since we check for data in _peek() anyway. */
             o->inq);
 
     o->outq_rtpoll_item_write = pa_rtpoll_item_new_asyncmsgq_write(
-            i->sink->rtpoll,
+            i->sink->thread_info.rtpoll,
             PA_RTPOLL_EARLY,
             o->outq);
+
+    pa_sink_input_request_rewind(i, 0, FALSE, TRUE, TRUE);
+
+    pa_atomic_store(&o->max_request, (int) pa_sink_input_get_max_request(i));
+
+    c = pa_sink_get_requested_latency_within_thread(i->sink);
+    pa_atomic_store(&o->requested_latency, (int) (c == (pa_usec_t) -1 ? 0 : c));
+
+    pa_asyncmsgq_post(o->outq, PA_MSGOBJECT(o->userdata->sink), SINK_MESSAGE_UPDATE_MAX_REQUEST, NULL, 0, NULL, NULL);
+    pa_asyncmsgq_post(o->outq, PA_MSGOBJECT(o->userdata->sink), SINK_MESSAGE_UPDATE_REQUESTED_LATENCY, NULL, 0, NULL, NULL);
 }
 
 /* Called from I/O thread context */
@@ -471,14 +520,15 @@ static void sink_input_detach_cb(pa_sink_input *i) {
     pa_sink_input_assert_ref(i);
     pa_assert_se(o = i->userdata);
 
-    /* Shut down the queue from the sink thread to us */
-    pa_assert(o->inq_rtpoll_item_read && o->outq_rtpoll_item_write);
-
-    pa_rtpoll_item_free(o->inq_rtpoll_item_read);
-    o->inq_rtpoll_item_read = NULL;
+    if (o->inq_rtpoll_item_read) {
+        pa_rtpoll_item_free(o->inq_rtpoll_item_read);
+        o->inq_rtpoll_item_read = NULL;
+    }
 
-    pa_rtpoll_item_free(o->outq_rtpoll_item_write);
-    o->outq_rtpoll_item_write = NULL;
+    if (o->outq_rtpoll_item_write) {
+        pa_rtpoll_item_free(o->outq_rtpoll_item_write);
+        o->outq_rtpoll_item_write = NULL;
+    }
 }
 
 /* Called from main context */
@@ -492,20 +542,6 @@ static void sink_input_kill_cb(pa_sink_input *i) {
     output_free(o);
 }
 
-/* Called from IO thread context */
-static void sink_input_state_change_cb(pa_sink_input *i, pa_sink_input_state_t state) {
-    struct userdata *u;
-
-    pa_sink_input_assert_ref(i);
-    pa_assert_se(u = i->userdata);
-
-    /* If we are added for the first time, ask for a rewinding so that
-     * we are heard right-away. */
-    if (PA_SINK_INPUT_IS_LINKED(state) &&
-        i->thread_info.state == PA_SINK_INPUT_INIT)
-        pa_sink_input_request_rewind(i, 0, FALSE, TRUE, TRUE);
-}
-
 /* Called from thread context */
 static int sink_input_process_msg(pa_msgobject *obj, int code, void *data, int64_t offset, pa_memchunk *chunk) {
     struct output *o = PA_SINK_INPUT(obj)->userdata;
@@ -536,37 +572,6 @@ static int sink_input_process_msg(pa_msgobject *obj, int code, void *data, int64
 }
 
 /* Called from main context */
-static void disable_output(struct output *o) {
-    pa_assert(o);
-
-    if (!o->sink_input)
-        return;
-
-    pa_sink_input_unlink(o->sink_input);
-    pa_asyncmsgq_send(o->userdata->sink->asyncmsgq, PA_MSGOBJECT(o->userdata->sink), SINK_MESSAGE_REMOVE_OUTPUT, o, 0, NULL);
-    pa_sink_input_unref(o->sink_input);
-    o->sink_input = NULL;
-}
-
-/* Called from main context */
-static void enable_output(struct output *o) {
-    pa_assert(o);
-
-    if (o->sink_input)
-        return;
-
-    if (output_create_sink_input(o) >= 0) {
-
-        pa_memblockq_flush_write(o->memblockq);
-
-        pa_sink_input_put(o->sink_input);
-
-        if (o->userdata->sink && PA_SINK_IS_LINKED(pa_sink_get_state(o->userdata->sink)))
-            pa_asyncmsgq_send(o->userdata->sink->asyncmsgq, PA_MSGOBJECT(o->userdata->sink), SINK_MESSAGE_ADD_OUTPUT, o, 0, NULL);
-    }
-}
-
-/* Called from main context */
 static void suspend(struct userdata *u) {
     struct output *o;
     uint32_t idx;
@@ -574,8 +579,8 @@ static void suspend(struct userdata *u) {
     pa_assert(u);
 
     /* Let's suspend by unlinking all streams */
-    for (o = pa_idxset_first(u->outputs, &idx); o; o = pa_idxset_next(u->outputs, &idx))
-        disable_output(o);
+    PA_IDXSET_FOREACH(o, u->outputs, idx)
+        output_disable(o);
 
     pa_log_info("Device suspended...");
 }
@@ -588,13 +593,8 @@ static void unsuspend(struct userdata *u) {
     pa_assert(u);
 
     /* Let's resume */
-    for (o = pa_idxset_first(u->outputs, &idx); o; o = pa_idxset_next(u->outputs, &idx)) {
-
-        pa_sink_suspend(o->sink, FALSE, PA_SUSPEND_IDLE);
-
-        if (PA_SINK_IS_OPENED(pa_sink_get_state(o->sink)))
-            enable_output(o);
-    }
+    PA_IDXSET_FOREACH(o, u->outputs, idx)
+        output_enable(o);
 
     pa_log_info("Resumed successfully...");
 }
@@ -638,7 +638,13 @@ static void update_max_request(struct userdata *u) {
     size_t max_request = 0;
     struct output *o;
 
-    for (o = u->thread_info.active_outputs; o; o = o->next) {
+    pa_assert(u);
+    pa_sink_assert_io_context(u->sink);
+
+    /* Collects the max_request values of all streams and sets the
+     * largest one locally */
+
+    PA_LLIST_FOREACH(o, u->thread_info.active_outputs) {
         size_t mr = (size_t) pa_atomic_load(&o->max_request);
 
         if (mr > max_request)
@@ -651,6 +657,67 @@ static void update_max_request(struct userdata *u) {
     pa_sink_set_max_request_within_thread(u->sink, max_request);
 }
 
+/* Called from IO context */
+static void update_fixed_latency(struct userdata *u) {
+    pa_usec_t fixed_latency = 0;
+    struct output *o;
+
+    pa_assert(u);
+    pa_sink_assert_io_context(u->sink);
+
+    /* Collects the requested_latency values of all streams and sets
+     * the largest one as fixed_latency locally */
+
+    PA_LLIST_FOREACH(o, u->thread_info.active_outputs) {
+        pa_usec_t rl = (size_t) pa_atomic_load(&o->requested_latency);
+
+        if (rl > fixed_latency)
+            fixed_latency = rl;
+    }
+
+    if (fixed_latency <= 0)
+        fixed_latency = u->block_usec;
+
+    pa_sink_set_fixed_latency_within_thread(u->sink, fixed_latency);
+}
+
+/* Called from thread context of the io thread */
+static void output_add_within_thread(struct output *o) {
+    pa_assert(o);
+    pa_sink_assert_io_context(o->sink);
+
+    PA_LLIST_PREPEND(struct output, o->userdata->thread_info.active_outputs, o);
+
+    pa_assert(!o->outq_rtpoll_item_read && !o->inq_rtpoll_item_write);
+
+    o->outq_rtpoll_item_read = pa_rtpoll_item_new_asyncmsgq_read(
+            o->userdata->rtpoll,
+            PA_RTPOLL_EARLY-1,  /* This item is very important */
+            o->outq);
+    o->inq_rtpoll_item_write = pa_rtpoll_item_new_asyncmsgq_write(
+            o->userdata->rtpoll,
+            PA_RTPOLL_EARLY,
+            o->inq);
+}
+
+/* Called from thread context of the io thread */
+static void output_remove_within_thread(struct output *o) {
+    pa_assert(o);
+    pa_sink_assert_io_context(o->sink);
+
+    PA_LLIST_REMOVE(struct output, o->userdata->thread_info.active_outputs, o);
+
+    if (o->outq_rtpoll_item_read) {
+        pa_rtpoll_item_free(o->outq_rtpoll_item_read);
+        o->outq_rtpoll_item_read = NULL;
+    }
+
+    if (o->inq_rtpoll_item_write) {
+        pa_rtpoll_item_free(o->inq_rtpoll_item_write);
+        o->inq_rtpoll_item_write = NULL;
+    }
+}
+
 /* Called from thread context of the io thread */
 static int sink_process_msg(pa_msgobject *o, int code, void *data, int64_t offset, pa_memchunk *chunk) {
     struct userdata *u = PA_SINK(o)->userdata;
@@ -683,42 +750,17 @@ static int sink_process_msg(pa_msgobject *o, int code, void *data, int64_t offse
             return 0;
         }
 
-        case SINK_MESSAGE_ADD_OUTPUT: {
-            struct output *op = data;
-
-            PA_LLIST_PREPEND(struct output, u->thread_info.active_outputs, op);
-
-            pa_assert(!op->outq_rtpoll_item_read && !op->inq_rtpoll_item_write);
-
-            op->outq_rtpoll_item_read = pa_rtpoll_item_new_asyncmsgq_read(
-                    u->rtpoll,
-                    PA_RTPOLL_EARLY-1,  /* This item is very important */
-                    op->outq);
-            op->inq_rtpoll_item_write = pa_rtpoll_item_new_asyncmsgq_write(
-                    u->rtpoll,
-                    PA_RTPOLL_EARLY,
-                    op->inq);
-
+        case SINK_MESSAGE_ADD_OUTPUT:
+            output_add_within_thread(data);
             update_max_request(u);
+            update_fixed_latency(u);
             return 0;
-        }
-
-        case SINK_MESSAGE_REMOVE_OUTPUT: {
-            struct output *op = data;
-
-            PA_LLIST_REMOVE(struct output, u->thread_info.active_outputs, op);
-
-            pa_assert(op->outq_rtpoll_item_read && op->inq_rtpoll_item_write);
-
-            pa_rtpoll_item_free(op->outq_rtpoll_item_read);
-            op->outq_rtpoll_item_read = NULL;
-
-            pa_rtpoll_item_free(op->inq_rtpoll_item_write);
-            op->inq_rtpoll_item_write = NULL;
 
+        case SINK_MESSAGE_REMOVE_OUTPUT:
+            output_remove_within_thread(data);
             update_max_request(u);
+            update_fixed_latency(u);
             return 0;
-        }
 
         case SINK_MESSAGE_NEED:
             render_memblock(u, (struct output*) data, (size_t) offset);
@@ -740,10 +782,13 @@ static int sink_process_msg(pa_msgobject *o, int code, void *data, int64_t offse
         }
 
         case SINK_MESSAGE_UPDATE_MAX_REQUEST:
-
             update_max_request(u);
             break;
-    }
+
+        case SINK_MESSAGE_UPDATE_REQUESTED_LATENCY:
+            update_fixed_latency(u);
+            break;
+}
 
     return pa_sink_process_msg(o, code, data, offset, chunk);
 }
@@ -756,6 +801,9 @@ static void update_description(struct userdata *u) {
 
     pa_assert(u);
 
+    if (!u->auto_desc)
+        return;
+
     if (pa_idxset_isempty(u->outputs)) {
         pa_sink_set_description(u->sink, "Simultaneous output");
         return;
@@ -763,7 +811,7 @@ static void update_description(struct userdata *u) {
 
     t = pa_xstrdup("Simultaneous output to");
 
-    for (o = pa_idxset_first(u->outputs, &idx); o; o = pa_idxset_next(u->outputs, &idx)) {
+    PA_IDXSET_FOREACH(o, u->outputs, idx) {
         char *e;
 
         if (first) {
@@ -798,7 +846,7 @@ static int output_create_sink_input(struct output *o) {
     data.module = o->userdata->module;
     data.resample_method = o->userdata->resample_method;
 
-    pa_sink_input_new(&o->sink_input, o->userdata->core, &data, PA_SINK_INPUT_VARIABLE_RATE|PA_SINK_INPUT_DONT_MOVE);
+    pa_sink_input_new(&o->sink_input, o->userdata->core, &data, PA_SINK_INPUT_VARIABLE_RATE|PA_SINK_INPUT_DONT_MOVE|PA_SINK_INPUT_NO_CREATE_ON_SUSPEND);
 
     pa_sink_input_new_data_done(&data);
 
@@ -808,9 +856,9 @@ static int output_create_sink_input(struct output *o) {
     o->sink_input->parent.process_msg = sink_input_process_msg;
     o->sink_input->pop = sink_input_pop_cb;
     o->sink_input->process_rewind = sink_input_process_rewind_cb;
-    o->sink_input->state_change = sink_input_state_change_cb;
     o->sink_input->update_max_rewind = sink_input_update_max_rewind_cb;
     o->sink_input->update_max_request = sink_input_update_max_request_cb;
+    o->sink_input->update_sink_requested_latency = sink_input_update_sink_requested_latency_cb;
     o->sink_input->attach = sink_input_attach_cb;
     o->sink_input->detach = sink_input_detach_cb;
     o->sink_input->kill = sink_input_kill_cb;
@@ -821,22 +869,19 @@ static int output_create_sink_input(struct output *o) {
     return 0;
 }
 
+/* Called from main context */
 static struct output *output_new(struct userdata *u, pa_sink *sink) {
     struct output *o;
-    pa_sink_state_t state;
 
     pa_assert(u);
     pa_assert(sink);
     pa_assert(u->sink);
 
-    o = pa_xnew(struct output, 1);
+    o = pa_xnew0(struct output, 1);
     o->userdata = u;
     o->inq = pa_asyncmsgq_new(0);
     o->outq = pa_asyncmsgq_new(0);
-    o->inq_rtpoll_item_write = o->inq_rtpoll_item_read = NULL;
-    o->outq_rtpoll_item_write = o->outq_rtpoll_item_read = NULL;
     o->sink = sink;
-    o->sink_input = NULL;
     o->memblockq = pa_memblockq_new(
             0,
             MEMBLOCKQ_MAXLENGTH,
@@ -846,84 +891,135 @@ static struct output *output_new(struct userdata *u, pa_sink *sink) {
             0,
             0,
             NULL);
-    pa_atomic_store(&o->max_request, 0);
-    PA_LLIST_INIT(struct output, o);
 
     pa_assert_se(pa_idxset_put(u->outputs, o, NULL) == 0);
+    update_description(u);
 
-    state = pa_sink_get_state(u->sink);
-
-    if (state != PA_SINK_INIT)
-        pa_asyncmsgq_send(u->sink->asyncmsgq, PA_MSGOBJECT(u->sink), SINK_MESSAGE_ADD_OUTPUT, o, 0, NULL);
-    else {
-        /* If the sink is not yet started, we need to do the activation ourselves */
-        PA_LLIST_PREPEND(struct output, u->thread_info.active_outputs, o);
-
-        o->outq_rtpoll_item_read = pa_rtpoll_item_new_asyncmsgq_read(
-                u->rtpoll,
-                PA_RTPOLL_EARLY-1,  /* This item is very important */
-                o->outq);
-        o->inq_rtpoll_item_write = pa_rtpoll_item_new_asyncmsgq_write(
-                u->rtpoll,
-                PA_RTPOLL_EARLY,
-                o->inq);
-    }
+    return o;
+}
 
-    if (PA_SINK_IS_OPENED(state) || state == PA_SINK_INIT) {
-        pa_sink_suspend(sink, FALSE, PA_SUSPEND_IDLE);
+/* Called from main context */
+static void output_free(struct output *o) {
+    pa_assert(o);
 
-        if (PA_SINK_IS_OPENED(pa_sink_get_state(sink)))
-            if (output_create_sink_input(o) < 0)
-                goto fail;
-    }
+    output_disable(o);
 
-    update_description(u);
+    pa_assert_se(pa_idxset_remove_by_data(o->userdata->outputs, o, NULL));
+    update_description(o->userdata);
 
-    return o;
+    if (o->inq_rtpoll_item_read)
+        pa_rtpoll_item_free(o->inq_rtpoll_item_read);
+    if (o->inq_rtpoll_item_write)
+        pa_rtpoll_item_free(o->inq_rtpoll_item_write);
 
-fail:
+    if (o->outq_rtpoll_item_read)
+        pa_rtpoll_item_free(o->outq_rtpoll_item_read);
+    if (o->outq_rtpoll_item_write)
+        pa_rtpoll_item_free(o->outq_rtpoll_item_write);
 
-    if (o) {
-        pa_idxset_remove_by_data(u->outputs, o, NULL);
+    if (o->inq)
+        pa_asyncmsgq_unref(o->inq);
 
-        if (o->sink_input) {
-            pa_sink_input_unlink(o->sink_input);
-            pa_sink_input_unref(o->sink_input);
-        }
+    if (o->outq)
+        pa_asyncmsgq_unref(o->outq);
+
+    if (o->memblockq)
+        pa_memblockq_free(o->memblockq);
+
+    pa_xfree(o);
+}
+
+/* Called from main context */
+static void output_enable(struct output *o) {
+    pa_assert(o);
+
+    if (o->sink_input)
+        return;
+
+    /* This might cause the sink to be resumed. The state change hook
+     * of the sink might hence be called from here, which might then
+     * cause us to be called in a loop. Make sure that state changes
+     * for this output don't cause this loop by setting a flag here */
+    o->ignore_state_change = TRUE;
 
-        if (o->memblockq)
-            pa_memblockq_free(o->memblockq);
+    if (output_create_sink_input(o) >= 0) {
 
-        if (o->inq)
-            pa_asyncmsgq_unref(o->inq);
+        if (pa_sink_get_state(o->sink) != PA_SINK_INIT) {
 
-        if (o->outq)
-            pa_asyncmsgq_unref(o->outq);
+            /* First we register the output. That means that the sink
+             * will start to pass data to this output. */
+            pa_asyncmsgq_send(o->userdata->sink->asyncmsgq, PA_MSGOBJECT(o->userdata->sink), SINK_MESSAGE_ADD_OUTPUT, o, 0, NULL);
 
-        pa_xfree(o);
+            /* Then we enable the sink input. That means that the sink
+             * is now asked for new data. */
+            pa_sink_input_put(o->sink_input);
+
+        } else
+            /* Hmm the sink is not yet started, do things right here */
+            output_add_within_thread(o);
     }
 
-    return NULL;
+    o->ignore_state_change = FALSE;
 }
 
+/* Called from main context */
+static void output_disable(struct output *o) {
+    pa_assert(o);
+
+    if (!o->sink_input)
+        return;
+
+    /* First we disable the sink input. That means that the sink is
+     * not asked for new data anymore  */
+    pa_sink_input_unlink(o->sink_input);
+
+    /* Then we unregister the output. That means that the sink doesn't
+     * pass any further data to this output */
+    pa_asyncmsgq_send(o->userdata->sink->asyncmsgq, PA_MSGOBJECT(o->userdata->sink), SINK_MESSAGE_REMOVE_OUTPUT, o, 0, NULL);
+
+    /* Now dellocate the stream */
+    pa_sink_input_unref(o->sink_input);
+    o->sink_input = NULL;
+
+    /* Finally, drop all queued data */
+    pa_memblockq_flush_write(o->memblockq);
+    pa_asyncmsgq_flush(o->inq, FALSE);
+    pa_asyncmsgq_flush(o->outq, FALSE);
+}
+
+/* Called from main context */
+static void output_verify(struct output *o) {
+    pa_assert(o);
+
+    if (PA_SINK_IS_OPENED(pa_sink_get_state(o->userdata->sink)))
+        output_enable(o);
+    else
+        output_disable(o);
+}
+
+/* Called from main context */
 static pa_bool_t is_suitable_sink(struct userdata *u, pa_sink *s) {
     const char *t;
 
     pa_sink_assert_ref(s);
 
+    if (s == u->sink)
+        return FALSE;
+
     if (!(s->flags & PA_SINK_HARDWARE))
         return FALSE;
 
-    if (s == u->sink)
+    if (!(s->flags & PA_SINK_LATENCY))
         return FALSE;
 
     if ((t = pa_proplist_gets(s->proplist, PA_PROP_DEVICE_CLASS)))
-        if (strcmp(t, "sound"))
+        if (!pa_streq(t, "sound"))
             return FALSE;
 
     return TRUE;
 }
 
+/* Called from main context */
 static pa_hook_result_t sink_put_hook_cb(pa_core *c, pa_sink *s, struct userdata* u) {
     struct output *o;
 
@@ -936,18 +1032,17 @@ static pa_hook_result_t sink_put_hook_cb(pa_core *c, pa_sink *s, struct userdata
         return PA_HOOK_OK;
 
     pa_log_info("Configuring new sink: %s", s->name);
-
     if (!(o = output_new(u, s))) {
         pa_log("Failed to create sink input on sink '%s'.", s->name);
         return PA_HOOK_OK;
     }
 
-    if (o->sink_input)
-        pa_sink_input_put(o->sink_input);
+    output_verify(o);
 
     return PA_HOOK_OK;
 }
 
+/* Called from main context */
 static struct output* find_output(struct userdata *u, pa_sink *s) {
     struct output *o;
     uint32_t idx;
@@ -958,13 +1053,14 @@ static struct output* find_output(struct userdata *u, pa_sink *s) {
     if (u->sink == s)
         return NULL;
 
-    for (o = pa_idxset_first(u->outputs, &idx); o; o = pa_idxset_next(u->outputs, &idx))
+    PA_IDXSET_FOREACH(o, u->outputs, idx)
         if (o->sink == s)
             return o;
 
     return NULL;
 }
 
+/* Called from main context */
 static pa_hook_result_t sink_unlink_hook_cb(pa_core *c, pa_sink *s, struct userdata* u) {
     struct output *o;
 
@@ -976,26 +1072,25 @@ static pa_hook_result_t sink_unlink_hook_cb(pa_core *c, pa_sink *s, struct userd
         return PA_HOOK_OK;
 
     pa_log_info("Unconfiguring sink: %s", s->name);
-
     output_free(o);
 
     return PA_HOOK_OK;
 }
 
+/* Called from main context */
 static pa_hook_result_t sink_state_changed_hook_cb(pa_core *c, pa_sink *s, struct userdata* u) {
     struct output *o;
-    pa_sink_state_t state;
 
     if (!(o = find_output(u, s)))
         return PA_HOOK_OK;
 
-    state = pa_sink_get_state(s);
-
-    if (PA_SINK_IS_OPENED(state) && PA_SINK_IS_OPENED(pa_sink_get_state(u->sink)) && !o->sink_input)
-        enable_output(o);
+    /* This state change might be triggered because we are creating a
+     * stream here, in that case we don't want to create it a second
+     * time here and enter a loop */
+    if (o->ignore_state_change)
+        return PA_HOOK_OK;
 
-    if (state == PA_SINK_SUSPENDED && o->sink_input)
-        disable_output(o);
+    output_verify(o);
 
     return PA_HOOK_OK;
 }
@@ -1025,18 +1120,14 @@ int pa__init(pa_module*m) {
         }
     }
 
-    m->userdata = u = pa_xnew(struct userdata, 1);
+    m->userdata = u = pa_xnew0(struct userdata, 1);
     u->core = m->core;
     u->module = m;
-    u->sink = NULL;
-    u->time_event = NULL;
     u->adjust_time = DEFAULT_ADJUST_TIME;
     u->rtpoll = pa_rtpoll_new();
     pa_thread_mq_init(&u->thread_mq, m->core->mainloop, u->rtpoll);
-    u->thread = NULL;
     u->resample_method = resample_method;
     u->outputs = pa_idxset_new(NULL, NULL);
-    memset(&u->adjust_timestamp, 0, sizeof(u->adjust_timestamp));
     u->sink_put_slot = u->sink_unlink_slot = u->sink_state_changed_slot = NULL;
     PA_LLIST_HEAD_INIT(struct output, u->thread_info.active_outputs);
     pa_atomic_store(&u->thread_info.running, FALSE);
@@ -1061,6 +1152,55 @@ int pa__init(pa_module*m) {
 
     ss = m->core->default_sample_spec;
     map = m->core->default_channel_map;
+
+    /* Check the specified slave sinks for sample_spec and channel_map to use for the combined sink */
+    if (!u->automatic) {
+        const char*split_state = NULL;
+        char *n = NULL;
+        pa_sample_spec slaves_spec;
+        pa_channel_map slaves_map;
+        pa_bool_t is_first_slave = TRUE;
+
+        while ((n = pa_split(slaves, ",", &split_state))) {
+            pa_sink *slave_sink;
+
+            if (!(slave_sink = pa_namereg_get(m->core, n, PA_NAMEREG_SINK))) {
+                pa_log("Invalid slave sink '%s'", n);
+                pa_xfree(n);
+                goto fail;
+            }
+
+            pa_xfree(n);
+
+            if (is_first_slave) {
+                slaves_spec = slave_sink->sample_spec;
+                slaves_map = slave_sink->channel_map;
+                is_first_slave = FALSE;
+            } else {
+                if (slaves_spec.format != slave_sink->sample_spec.format)
+                    slaves_spec.format = PA_SAMPLE_INVALID;
+
+                if (slaves_spec.rate < slave_sink->sample_spec.rate)
+                    slaves_spec.rate = slave_sink->sample_spec.rate;
+
+                if (!pa_channel_map_equal(&slaves_map, &slave_sink->channel_map))
+                    slaves_spec.channels = 0;
+            }
+        }
+
+        if (!is_first_slave) {
+            if (slaves_spec.format != PA_SAMPLE_INVALID)
+                ss.format = slaves_spec.format;
+
+            ss.rate = slaves_spec.rate;
+
+            if (slaves_spec.channels > 0) {
+                map = slaves_map;
+                ss.channels = slaves_map.channels;
+            }
+        }
+    }
+
     if ((pa_modargs_get_sample_spec_and_channel_map(ma, &ss, &map, PA_CHANNEL_MAP_DEFAULT) < 0)) {
         pa_log("Invalid sample specification.");
         goto fail;
@@ -1073,7 +1213,6 @@ int pa__init(pa_module*m) {
     pa_sink_new_data_set_name(&data, pa_modargs_get_value(ma, "sink_name", DEFAULT_SINK_NAME));
     pa_sink_new_data_set_sample_spec(&data, &ss);
     pa_sink_new_data_set_channel_map(&data, &map);
-    pa_proplist_sets(data.proplist, PA_PROP_DEVICE_DESCRIPTION, "Simultaneous Output");
     pa_proplist_sets(data.proplist, PA_PROP_DEVICE_CLASS, "filter");
 
     if (slaves)
@@ -1085,6 +1224,13 @@ int pa__init(pa_module*m) {
         goto fail;
     }
 
+    /* Check proplist for a description & fill in a default value if not */
+    u->auto_desc = FALSE;
+    if (NULL == pa_proplist_gets(data.proplist, PA_PROP_DEVICE_DESCRIPTION)) {
+        u->auto_desc = TRUE;
+        pa_proplist_sets(data.proplist, PA_PROP_DEVICE_DESCRIPTION, "Simultaneous Output");
+    }
+
     u->sink = pa_sink_new(m->core, &data, PA_SINK_LATENCY);
     pa_sink_new_data_done(&data);
 
@@ -1138,7 +1284,7 @@ int pa__init(pa_module*m) {
 
         /* We're in automatic mode, we add every sink that matches our needs  */
 
-        for (s = pa_idxset_first(m->core->sinks, &idx); s; s = pa_idxset_next(m->core->sinks, &idx)) {
+        PA_IDXSET_FOREACH(s, m->core->sinks, idx) {
 
             if (!is_suitable_sink(u, s))
                 continue;
@@ -1163,9 +1309,8 @@ int pa__init(pa_module*m) {
     /* Activate the sink and the sink inputs */
     pa_sink_put(u->sink);
 
-    for (o = pa_idxset_first(u->outputs, &idx); o; o = pa_idxset_next(u->outputs, &idx))
-        if (o->sink_input)
-            pa_sink_input_put(o->sink_input);
+    PA_IDXSET_FOREACH(o, u->outputs, idx)
+        output_verify(o);
 
     if (u->adjust_time > 0)
         u->time_event = pa_core_rttime_new(m->core, pa_rtclock_now() + u->adjust_time * PA_USEC_PER_SEC, time_callback, u);
@@ -1184,37 +1329,6 @@ fail:
     return -1;
 }
 
-static void output_free(struct output *o) {
-    pa_assert(o);
-
-    disable_output(o);
-
-    pa_assert_se(pa_idxset_remove_by_data(o->userdata->outputs, o, NULL));
-
-    update_description(o->userdata);
-
-    if (o->inq_rtpoll_item_read)
-        pa_rtpoll_item_free(o->inq_rtpoll_item_read);
-    if (o->inq_rtpoll_item_write)
-        pa_rtpoll_item_free(o->inq_rtpoll_item_write);
-
-    if (o->outq_rtpoll_item_read)
-        pa_rtpoll_item_free(o->outq_rtpoll_item_read);
-    if (o->outq_rtpoll_item_write)
-        pa_rtpoll_item_free(o->outq_rtpoll_item_write);
-
-    if (o->inq)
-        pa_asyncmsgq_unref(o->inq);
-
-    if (o->outq)
-        pa_asyncmsgq_unref(o->outq);
-
-    if (o->memblockq)
-        pa_memblockq_free(o->memblockq);
-
-    pa_xfree(o);
-}
-
 void pa__done(pa_module*m) {
     struct userdata *u;
     struct output *o;