Adding upstream version 14.2.upstream/14.2upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1581 insertions, 0 deletions

diff --git a/src/modules/module-combine-sink.c b/src/modules/module-combine-sink.c
new file mode 100644
index 0000000..685e240
--- /dev/null
+++ b/src/modules/module-combine-sink.c
@@ -0,0 +1,1581 @@
+/***
+  This file is part of PulseAudio.
+
+  Copyright 2004-2008 Lennart Poettering
+
+  PulseAudio is free software; you can redistribute it and/or modify
+  it under the terms of the GNU Lesser General Public License as published
+  by the Free Software Foundation; either version 2.1 of the License,
+  or (at your option) any later version.
+
+  PulseAudio is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
+***/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdio.h>
+#include <errno.h>
+
+#include <pulse/rtclock.h>
+#include <pulse/timeval.h>
+#include <pulse/util.h>
+#include <pulse/xmalloc.h>
+
+#include <pulsecore/macro.h>
+#include <pulsecore/module.h>
+#include <pulsecore/llist.h>
+#include <pulsecore/sink.h>
+#include <pulsecore/sink-input.h>
+#include <pulsecore/memblockq.h>
+#include <pulsecore/log.h>
+#include <pulsecore/core-rtclock.h>
+#include <pulsecore/core-util.h>
+#include <pulsecore/modargs.h>
+#include <pulsecore/namereg.h>
+#include <pulsecore/thread.h>
+#include <pulsecore/thread-mq.h>
+#include <pulsecore/rtpoll.h>
+#include <pulsecore/time-smoother.h>
+#include <pulsecore/strlist.h>
+
+PA_MODULE_AUTHOR("Lennart Poettering");
+PA_MODULE_DESCRIPTION("Combine multiple sinks to one");
+PA_MODULE_VERSION(PACKAGE_VERSION);
+PA_MODULE_LOAD_ONCE(false);
+PA_MODULE_USAGE(
+        "sink_name=<name for the sink> "
+        "sink_properties=<properties for the sink> "
+        "slaves=<slave sinks> "
+        "adjust_time=<how often to readjust rates in s> "
+        "resample_method=<method> "
+        "format=<sample format> "
+        "rate=<sample rate> "
+        "channels=<number of channels> "
+        "channel_map=<channel map>");
+
+#define DEFAULT_SINK_NAME "combined"
+
+#define MEMBLOCKQ_MAXLENGTH (1024*1024*16)
+
+#define DEFAULT_ADJUST_TIME_USEC (10*PA_USEC_PER_SEC)
+
+#define BLOCK_USEC (PA_USEC_PER_MSEC * 200)
+
+static const char* const valid_modargs[] = {
+    "sink_name",
+    "sink_properties",
+    "slaves",
+    "adjust_time",
+    "resample_method",
+    "format",
+    "rate",
+    "channels",
+    "channel_map",
+    NULL
+};
+
+struct output {
+    struct userdata *userdata;
+
+    pa_sink *sink;
+    pa_sink_input *sink_input;
+    bool ignore_state_change;
+
+    /* This message queue is only for POST messages, i.e. the messages that
+     * carry audio data from the sink thread to the output thread. The POST
+     * messages need to be handled in a separate queue, because the queue is
+     * processed not only in the output thread mainloop, but also inside the
+     * sink input pop() callback. Processing other messages (such as
+     * SET_REQUESTED_LATENCY) is not safe inside the pop() callback; at least
+     * one reason why it's not safe is that messages that generate rewind
+     * requests (such as SET_REQUESTED_LATENCY) cause crashes when processed
+     * in the pop() callback. */
+    pa_asyncmsgq *audio_inq;
+
+    /* This message queue is for all other messages than POST from the sink
+     * thread to the output thread (currently "all other messages" means just
+     * the SET_REQUESTED_LATENCY message). */
+    pa_asyncmsgq *control_inq;
+
+    /* Message queue from the output thread to the sink thread. */
+    pa_asyncmsgq *outq;
+
+    pa_rtpoll_item *audio_inq_rtpoll_item_read, *audio_inq_rtpoll_item_write;
+    pa_rtpoll_item *control_inq_rtpoll_item_read, *control_inq_rtpoll_item_write;
+    pa_rtpoll_item *outq_rtpoll_item_read, *outq_rtpoll_item_write;
+
+    pa_memblockq *memblockq;
+
+    /* For communication of the stream latencies to the main thread */
+    pa_usec_t total_latency;
+
+    /* For communication of the stream parameters to the sink thread */
+    pa_atomic_t max_request;
+    pa_atomic_t max_latency;
+    pa_atomic_t min_latency;
+
+    PA_LLIST_FIELDS(struct output);
+};
+
+struct userdata {
+    pa_core *core;
+    pa_module *module;
+    pa_sink *sink;
+
+    pa_thread *thread;
+    pa_thread_mq thread_mq;
+    pa_rtpoll *rtpoll;
+
+    pa_time_event *time_event;
+    pa_usec_t adjust_time;
+
+    bool automatic;
+    bool auto_desc;
+
+    pa_strlist *unlinked_slaves;
+
+    pa_hook_slot *sink_put_slot, *sink_unlink_slot, *sink_state_changed_slot;
+
+    pa_resample_method_t resample_method;
+
+    pa_usec_t block_usec;
+    pa_usec_t default_min_latency;
+    pa_usec_t default_max_latency;
+
+    pa_idxset* outputs; /* managed in main context */
+
+    struct {
+        PA_LLIST_HEAD(struct output, active_outputs); /* managed in IO thread context */
+        pa_atomic_t running;  /* we cache that value here, so that every thread can query it cheaply */
+        pa_usec_t timestamp;
+        bool in_null_mode;
+        pa_smoother *smoother;
+        uint64_t counter;
+    } thread_info;
+};
+
+enum {
+    SINK_MESSAGE_ADD_OUTPUT = PA_SINK_MESSAGE_MAX,
+    SINK_MESSAGE_REMOVE_OUTPUT,
+    SINK_MESSAGE_NEED,
+    SINK_MESSAGE_UPDATE_LATENCY,
+    SINK_MESSAGE_UPDATE_MAX_REQUEST,
+    SINK_MESSAGE_UPDATE_LATENCY_RANGE
+};
+
+enum {
+    SINK_INPUT_MESSAGE_POST = PA_SINK_INPUT_MESSAGE_MAX,
+    SINK_INPUT_MESSAGE_SET_REQUESTED_LATENCY
+};
+
+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);
+
+static void adjust_rates(struct userdata *u) {
+    struct output *o;
+    pa_usec_t max_sink_latency = 0, min_total_latency = (pa_usec_t) -1, target_latency, avg_total_latency = 0;
+    uint32_t base_rate;
+    uint32_t idx;
+    unsigned n = 0;
+
+    pa_assert(u);
+    pa_sink_assert_ref(u->sink);
+
+    if (pa_idxset_size(u->outputs) <= 0)
+        return;
+
+    if (!PA_SINK_IS_OPENED(u->sink->state))
+        return;
+
+    PA_IDXSET_FOREACH(o, u->outputs, idx) {
+        pa_usec_t sink_latency;
+
+        if (!o->sink_input || !PA_SINK_IS_OPENED(o->sink->state))
+            continue;
+
+        o->total_latency = pa_sink_input_get_latency(o->sink_input, &sink_latency);
+        o->total_latency += sink_latency;
+
+        if (sink_latency > max_sink_latency)
+            max_sink_latency = sink_latency;
+
+        if (min_total_latency == (pa_usec_t) -1 || o->total_latency < min_total_latency)
+            min_total_latency = o->total_latency;
+
+        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)
+        return;
+
+    avg_total_latency /= n;
+
+    target_latency = PA_MAX(max_sink_latency, min_total_latency);
+
+    pa_log_info("[%s] avg total latency is %0.2f msec.", u->sink->name, (double) avg_total_latency / PA_USEC_PER_MSEC);
+    pa_log_info("[%s] target latency is %0.2f msec.", u->sink->name, (double) target_latency / PA_USEC_PER_MSEC);
+
+    base_rate = u->sink->sample_spec.rate;
+
+    PA_IDXSET_FOREACH(o, u->outputs, idx) {
+        uint32_t new_rate = base_rate;
+        uint32_t current_rate;
+
+        if (!o->sink_input || !PA_SINK_IS_OPENED(o->sink->state))
+            continue;
+
+        current_rate = o->sink_input->sample_spec.rate;
+
+        if (o->total_latency != target_latency)
+            new_rate += (uint32_t) (((double) o->total_latency - (double) target_latency) / (double) u->adjust_time * (double) new_rate);
+
+        if (new_rate < (uint32_t) (base_rate*0.8) || new_rate > (uint32_t) (base_rate*1.25)) {
+            pa_log_warn("[%s] sample rates too different, not adjusting (%u vs. %u).", o->sink_input->sink->name, base_rate, new_rate);
+            new_rate = base_rate;
+        } else {
+            if (base_rate < new_rate + 20 && new_rate < base_rate + 20)
+              new_rate = base_rate;
+            /* Do the adjustment in small steps; 2‰ can be considered inaudible */
+            if (new_rate < (uint32_t) (current_rate*0.998) || new_rate > (uint32_t) (current_rate*1.002)) {
+                pa_log_info("[%s] new rate of %u Hz not within 2‰ of %u Hz, forcing smaller adjustment", o->sink_input->sink->name, new_rate, current_rate);
+                new_rate = PA_CLAMP(new_rate, (uint32_t) (current_rate*0.998), (uint32_t) (current_rate*1.002));
+            }
+            pa_log_info("[%s] new rate is %u Hz; ratio is %0.3f; latency is %0.2f msec.", o->sink_input->sink->name, new_rate, (double) new_rate / base_rate, (double) o->total_latency / PA_USEC_PER_MSEC);
+        }
+        pa_sink_input_set_rate(o->sink_input, new_rate);
+    }
+
+    pa_asyncmsgq_send(u->sink->asyncmsgq, PA_MSGOBJECT(u->sink), SINK_MESSAGE_UPDATE_LATENCY, NULL, (int64_t) avg_total_latency, NULL);
+}
+
+static void time_callback(pa_mainloop_api *a, pa_time_event *e, const struct timeval *t, void *userdata) {
+    struct userdata *u = userdata;
+
+    pa_assert(u);
+    pa_assert(a);
+    pa_assert(u->time_event == e);
+
+    adjust_rates(u);
+
+    if (u->sink->state == PA_SINK_SUSPENDED) {
+        u->core->mainloop->time_free(e);
+        u->time_event = NULL;
+    } else
+        pa_core_rttime_restart(u->core, e, pa_rtclock_now() + u->adjust_time);
+}
+
+static void process_render_null(struct userdata *u, pa_usec_t now) {
+    size_t ate = 0;
+
+    pa_assert(u);
+    pa_assert(u->sink->thread_info.state == PA_SINK_RUNNING);
+
+    if (u->thread_info.in_null_mode)
+        u->thread_info.timestamp = now;
+
+    while (u->thread_info.timestamp < now + u->block_usec) {
+        pa_memchunk chunk;
+
+        pa_sink_render(u->sink, u->sink->thread_info.max_request, &chunk);
+        pa_memblock_unref(chunk.memblock);
+
+        u->thread_info.counter += chunk.length;
+
+/*         pa_log_debug("Ate %lu bytes.", (unsigned long) chunk.length); */
+        u->thread_info.timestamp += pa_bytes_to_usec(chunk.length, &u->sink->sample_spec);
+
+        ate += chunk.length;
+
+        if (ate >= u->sink->thread_info.max_request)
+            break;
+    }
+
+/*     pa_log_debug("Ate in sum %lu bytes (of %lu)", (unsigned long) ate, (unsigned long) nbytes); */
+
+    pa_smoother_put(u->thread_info.smoother, now,
+                    pa_bytes_to_usec(u->thread_info.counter, &u->sink->sample_spec) - (u->thread_info.timestamp - now));
+}
+
+static void thread_func(void *userdata) {
+    struct userdata *u = userdata;
+
+    pa_assert(u);
+
+    pa_log_debug("Thread starting up");
+
+    if (u->core->realtime_scheduling)
+        pa_thread_make_realtime(u->core->realtime_priority+1);
+
+    pa_thread_mq_install(&u->thread_mq);
+
+    u->thread_info.timestamp = pa_rtclock_now();
+    u->thread_info.in_null_mode = false;
+
+    for (;;) {
+        int ret;
+
+        if (PA_UNLIKELY(u->sink->thread_info.rewind_requested))
+            pa_sink_process_rewind(u->sink, 0);
+
+        /* If no outputs are connected, render some data and drop it immediately. */
+        if (u->sink->thread_info.state == PA_SINK_RUNNING && !u->thread_info.active_outputs) {
+            pa_usec_t now;
+
+            now = pa_rtclock_now();
+
+            if (!u->thread_info.in_null_mode || u->thread_info.timestamp <= now)
+                process_render_null(u, now);
+
+            pa_rtpoll_set_timer_absolute(u->rtpoll, u->thread_info.timestamp);
+            u->thread_info.in_null_mode = true;
+        } else {
+            pa_rtpoll_set_timer_disabled(u->rtpoll);
+            u->thread_info.in_null_mode = false;
+        }
+
+        /* Hmm, nothing to do. Let's sleep */
+        if ((ret = pa_rtpoll_run(u->rtpoll)) < 0) {
+            pa_log_info("pa_rtpoll_run() = %i", ret);
+            goto fail;
+        }
+
+        if (ret == 0)
+            goto finish;
+    }
+
+fail:
+    /* If this was no regular exit from the loop we have to continue
+     * processing messages until we received PA_MESSAGE_SHUTDOWN */
+    pa_asyncmsgq_post(u->thread_mq.outq, PA_MSGOBJECT(u->core), PA_CORE_MESSAGE_UNLOAD_MODULE, u->module, 0, NULL, NULL);
+    pa_asyncmsgq_wait_for(u->thread_mq.inq, PA_MESSAGE_SHUTDOWN);
+
+finish:
+    pa_log_debug("Thread shutting down");
+}
+
+/* Called from combine sink I/O thread context */
+static void render_memblock(struct userdata *u, struct output *o, size_t length) {
+    pa_assert(u);
+    pa_assert(o);
+
+    /* We are run by the sink thread, on behalf of an output (o). The
+     * output is waiting for us, hence it is safe to access its
+     * mainblockq and asyncmsgq directly. */
+
+    /* If we are not running, we cannot produce any data */
+    if (!pa_atomic_load(&u->thread_info.running))
+        return;
+
+    /* Maybe there's some data in the requesting output's queue
+     * now? */
+    while (pa_asyncmsgq_process_one(o->audio_inq) > 0)
+        ;
+
+    /* Ok, now let's prepare some data if we really have to */
+    while (!pa_memblockq_is_readable(o->memblockq)) {
+        struct output *j;
+        pa_memchunk chunk;
+
+        /* Render data! */
+        pa_sink_render(u->sink, length, &chunk);
+
+        u->thread_info.counter += chunk.length;
+
+        /* OK, let's send this data to the other threads */
+        PA_LLIST_FOREACH(j, u->thread_info.active_outputs) {
+            if (j == o)
+                continue;
+
+            pa_asyncmsgq_post(j->audio_inq, PA_MSGOBJECT(j->sink_input), SINK_INPUT_MESSAGE_POST, NULL, 0, &chunk, NULL);
+        }
+
+        /* And place it directly into the requesting output's queue */
+        pa_memblockq_push_align(o->memblockq, &chunk);
+        pa_memblock_unref(chunk.memblock);
+    }
+}
+
+/* Called from I/O thread context */
+static void request_memblock(struct output *o, size_t length) {
+    pa_assert(o);
+    pa_sink_input_assert_ref(o->sink_input);
+    pa_sink_assert_ref(o->userdata->sink);
+
+    /* If another thread already prepared some data we received
+     * the data over the asyncmsgq, hence let's first process
+     * it. */
+    while (pa_asyncmsgq_process_one(o->audio_inq) > 0)
+        ;
+
+    /* Check whether we're now readable */
+    if (pa_memblockq_is_readable(o->memblockq))
+        return;
+
+    /* OK, we need to prepare new data, but only if the sink is actually running */
+    if (pa_atomic_load(&o->userdata->thread_info.running))
+        pa_asyncmsgq_send(o->outq, PA_MSGOBJECT(o->userdata->sink), SINK_MESSAGE_NEED, o, (int64_t) length, NULL);
+}
+
+/* Called from I/O thread context */
+static int sink_input_pop_cb(pa_sink_input *i, size_t nbytes, pa_memchunk *chunk) {
+    struct output *o;
+
+    pa_sink_input_assert_ref(i);
+    pa_assert_se(o = i->userdata);
+
+    /* 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;
+}
+
+/* Called from I/O thread context */
+static void sink_input_process_rewind_cb(pa_sink_input *i, size_t nbytes) {
+    struct output *o;
+
+    pa_sink_input_assert_ref(i);
+    pa_assert_se(o = i->userdata);
+
+    pa_memblockq_rewind(o->memblockq, nbytes);
+}
+
+/* Called from I/O thread context */
+static void sink_input_update_max_rewind_cb(pa_sink_input *i, size_t nbytes) {
+    struct output *o;
+
+    pa_sink_input_assert_ref(i);
+    pa_assert_se(o = i->userdata);
+
+    pa_memblockq_set_maxrewind(o->memblockq, nbytes);
+}
+
+/* Called from I/O thread context */
+static void sink_input_update_max_request_cb(pa_sink_input *i, size_t nbytes) {
+    struct output *o;
+
+    pa_sink_input_assert_ref(i);
+    pa_assert_se(o = i->userdata);
+
+    if (pa_atomic_load(&o->max_request) == (int) nbytes)
+        return;
+
+    pa_atomic_store(&o->max_request, (int) nbytes);
+    pa_log_debug("Sink input update max request %lu", (unsigned long) 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_latency_range_cb(pa_sink_input *i) {
+    struct output *o;
+    pa_usec_t min, max, fix;
+
+    pa_assert(i);
+
+    pa_sink_input_assert_ref(i);
+    pa_assert_se(o = i->userdata);
+
+    fix = i->sink->thread_info.fixed_latency;
+    if (fix > 0) {
+        min = fix;
+        max = fix;
+    } else {
+        min = i->sink->thread_info.min_latency;
+        max = i->sink->thread_info.max_latency;
+    }
+
+    if ((pa_atomic_load(&o->min_latency) == (int) min) &&
+        (pa_atomic_load(&o->max_latency) == (int) max))
+        return;
+
+    pa_atomic_store(&o->min_latency, (int) min);
+    pa_atomic_store(&o->max_latency, (int) max);
+    pa_log_debug("Sink input update latency range %lu %lu", (unsigned long) min, (unsigned long) max);
+    pa_asyncmsgq_post(o->outq, PA_MSGOBJECT(o->userdata->sink), SINK_MESSAGE_UPDATE_LATENCY_RANGE, 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 fix, min, max;
+    size_t nbytes;
+
+    pa_sink_input_assert_ref(i);
+    pa_assert_se(o = i->userdata);
+
+    /* Set up the queue from the sink thread to us */
+    pa_assert(!o->audio_inq_rtpoll_item_read);
+    pa_assert(!o->control_inq_rtpoll_item_read);
+    pa_assert(!o->outq_rtpoll_item_write);
+
+    o->audio_inq_rtpoll_item_read = pa_rtpoll_item_new_asyncmsgq_read(
+            i->sink->thread_info.rtpoll,
+            PA_RTPOLL_LATE,  /* This one is not that important, since we check for data in _peek() anyway. */
+            o->audio_inq);
+
+    o->control_inq_rtpoll_item_read = pa_rtpoll_item_new_asyncmsgq_read(
+            i->sink->thread_info.rtpoll,
+            PA_RTPOLL_NORMAL,
+            o->control_inq);
+
+    o->outq_rtpoll_item_write = pa_rtpoll_item_new_asyncmsgq_write(
+            i->sink->thread_info.rtpoll,
+            PA_RTPOLL_EARLY,
+            o->outq);
+
+    pa_sink_input_request_rewind(i, 0, false, true, true);
+
+    nbytes = pa_sink_input_get_max_request(i);
+    pa_atomic_store(&o->max_request, (int) nbytes);
+    pa_log_debug("attach max request %lu", (unsigned long) nbytes);
+
+    fix = i->sink->thread_info.fixed_latency;
+    if (fix > 0) {
+        min = max = fix;
+    } else {
+        min = i->sink->thread_info.min_latency;
+        max = i->sink->thread_info.max_latency;
+    }
+    pa_atomic_store(&o->min_latency, (int) min);
+    pa_atomic_store(&o->max_latency, (int) max);
+    pa_log_debug("attach latency range %lu %lu", (unsigned long) min, (unsigned long) max);
+
+    /* 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);
+}
+
+/* Called from I/O thread context */
+static void sink_input_detach_cb(pa_sink_input *i) {
+    struct output *o;
+
+    pa_sink_input_assert_ref(i);
+    pa_assert_se(o = i->userdata);
+
+    /* 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);
+
+    if (o->audio_inq_rtpoll_item_read) {
+        pa_rtpoll_item_free(o->audio_inq_rtpoll_item_read);
+        o->audio_inq_rtpoll_item_read = NULL;
+    }
+
+    if (o->control_inq_rtpoll_item_read) {
+        pa_rtpoll_item_free(o->control_inq_rtpoll_item_read);
+        o->control_inq_rtpoll_item_read = 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 */
+static void sink_input_kill_cb(pa_sink_input *i) {
+    struct output *o;
+
+    pa_sink_input_assert_ref(i);
+    pa_assert_se(o = i->userdata);
+
+    pa_module_unload_request(o->userdata->module, true);
+    pa_idxset_remove_by_data(o->userdata->outputs, o, NULL);
+    output_free(o);
+}
+
+/* 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;
+
+    switch (code) {
+
+        case PA_SINK_INPUT_MESSAGE_GET_LATENCY: {
+            pa_usec_t *r = data;
+
+            *r = pa_bytes_to_usec(pa_memblockq_get_length(o->memblockq), &o->sink_input->sample_spec);
+
+            /* Fall through, the default handler will add in the extra
+             * latency added by the resampler */
+            break;
+        }
+
+        case SINK_INPUT_MESSAGE_POST:
+
+            if (PA_SINK_IS_OPENED(o->sink_input->sink->thread_info.state))
+                pa_memblockq_push_align(o->memblockq, chunk);
+            else
+                pa_memblockq_flush_write(o->memblockq, true);
+
+            return 0;
+
+        case SINK_INPUT_MESSAGE_SET_REQUESTED_LATENCY: {
+            pa_usec_t latency = (pa_usec_t) offset;
+
+            pa_sink_input_set_requested_latency_within_thread(o->sink_input, latency);
+
+            return 0;
+        }
+    }
+
+    return pa_sink_input_process_msg(obj, code, data, offset, chunk);
+}
+
+/* Called from main context */
+static void suspend(struct userdata *u) {
+    struct output *o;
+    uint32_t idx;
+
+    pa_assert(u);
+
+    /* Let's suspend by unlinking all streams */
+    PA_IDXSET_FOREACH(o, u->outputs, idx)
+        output_disable(o);
+
+    pa_log_info("Device suspended...");
+}
+
+/* Called from main context */
+static void unsuspend(struct userdata *u) {
+    struct output *o;
+    uint32_t idx;
+
+    pa_assert(u);
+
+    /* Let's resume */
+    PA_IDXSET_FOREACH(o, u->outputs, idx)
+        output_enable(o);
+
+    if (!u->time_event && u->adjust_time > 0)
+        u->time_event = pa_core_rttime_new(u->core, pa_rtclock_now() + u->adjust_time, time_callback, u);
+
+    pa_log_info("Resumed successfully...");
+}
+
+/* Called from main context */
+static int sink_set_state_in_main_thread_cb(pa_sink *sink, pa_sink_state_t state, pa_suspend_cause_t suspend_cause) {
+    struct userdata *u;
+
+    pa_sink_assert_ref(sink);
+    pa_assert_se(u = sink->userdata);
+
+    /* It may be that only the suspend cause is changing, in which
+     * case there's nothing to do. */
+    if (state == u->sink->state)
+        return 0;
+
+    /* Please note that in contrast to the ALSA modules we call
+     * suspend/unsuspend from main context here! */
+
+    switch (state) {
+        case PA_SINK_SUSPENDED:
+            pa_assert(PA_SINK_IS_OPENED(u->sink->state));
+
+            suspend(u);
+            break;
+
+        case PA_SINK_IDLE:
+        case PA_SINK_RUNNING:
+
+            if (u->sink->state == PA_SINK_SUSPENDED)
+                unsuspend(u);
+
+            break;
+
+        case PA_SINK_UNLINKED:
+        case PA_SINK_INIT:
+        case PA_SINK_INVALID_STATE:
+            ;
+    }
+
+    return 0;
+}
+
+/* Called from the IO thread. */
+static int sink_set_state_in_io_thread_cb(pa_sink *s, pa_sink_state_t new_state, pa_suspend_cause_t new_suspend_cause) {
+    struct userdata *u;
+    bool running;
+
+    pa_assert(s);
+    pa_assert_se(u = s->userdata);
+
+    /* It may be that only the suspend cause is changing, in which case there's
+     * nothing to do. */
+    if (new_state == s->thread_info.state)
+        return 0;
+
+    running = new_state == PA_SINK_RUNNING;
+    pa_atomic_store(&u->thread_info.running, running);
+
+    if (running)
+        pa_smoother_resume(u->thread_info.smoother, pa_rtclock_now(), true);
+    else
+        pa_smoother_pause(u->thread_info.smoother, pa_rtclock_now());
+
+    return 0;
+}
+
+/* Called from IO context */
+static void update_max_request(struct userdata *u) {
+    size_t max_request = 0;
+    struct output *o;
+
+    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)
+            max_request = mr;
+    }
+
+    if (max_request <= 0)
+        max_request = pa_usec_to_bytes(u->block_usec, &u->sink->sample_spec);
+
+    pa_log_debug("Sink update max request %lu", (unsigned long) max_request);
+    pa_sink_set_max_request_within_thread(u->sink, max_request);
+}
+
+/* Called from IO context */
+static void update_latency_range(struct userdata *u) {
+    pa_usec_t min_latency = 0, max_latency = (pa_usec_t) -1;
+    struct output *o;
+
+    pa_assert(u);
+    pa_sink_assert_io_context(u->sink);
+
+    /* Collects the latency_range values of all streams and sets
+     * the max of min and min of max locally */
+    PA_LLIST_FOREACH(o, u->thread_info.active_outputs) {
+        pa_usec_t min = (size_t) pa_atomic_load(&o->min_latency);
+        pa_usec_t max = (size_t) pa_atomic_load(&o->max_latency);
+
+        if (min > min_latency)
+            min_latency = min;
+        if (max_latency == (pa_usec_t) -1 || max < max_latency)
+            max_latency = max;
+    }
+    if (max_latency == (pa_usec_t) -1) {
+        /* No outputs, use default limits. */
+        min_latency = u->default_min_latency;
+        max_latency = u->default_max_latency;
+    }
+
+    /* As long as we don't support rewinding, we should limit the max latency
+     * to a conservative value. */
+    if (max_latency > u->default_max_latency)
+        max_latency = u->default_max_latency;
+
+    /* Never ever try to set lower max latency than min latency, it just
+     * doesn't make sense. */
+    if (max_latency < min_latency)
+        max_latency = min_latency;
+
+    pa_log_debug("Sink update latency range %" PRIu64 " %" PRIu64, min_latency, max_latency);
+    pa_sink_set_latency_range_within_thread(u->sink, min_latency, max_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);
+    pa_assert(!o->audio_inq_rtpoll_item_write);
+    pa_assert(!o->control_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->audio_inq_rtpoll_item_write = pa_rtpoll_item_new_asyncmsgq_write(
+            o->userdata->rtpoll,
+            PA_RTPOLL_EARLY,
+            o->audio_inq);
+    o->control_inq_rtpoll_item_write = pa_rtpoll_item_new_asyncmsgq_write(
+            o->userdata->rtpoll,
+            PA_RTPOLL_NORMAL,
+            o->control_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->audio_inq_rtpoll_item_write) {
+        pa_rtpoll_item_free(o->audio_inq_rtpoll_item_write);
+        o->audio_inq_rtpoll_item_write = NULL;
+    }
+
+    if (o->control_inq_rtpoll_item_write) {
+        pa_rtpoll_item_free(o->control_inq_rtpoll_item_write);
+        o->control_inq_rtpoll_item_write = NULL;
+    }
+}
+
+/* Called from sink I/O thread context */
+static void sink_update_requested_latency(pa_sink *s) {
+    struct userdata *u;
+    struct output *o;
+
+    pa_sink_assert_ref(s);
+    pa_assert_se(u = s->userdata);
+
+    u->block_usec = pa_sink_get_requested_latency_within_thread(s);
+
+    if (u->block_usec == (pa_usec_t) -1)
+        u->block_usec = s->thread_info.max_latency;
+
+    pa_log_debug("Sink update requested latency %0.2f", (double) u->block_usec / PA_USEC_PER_MSEC);
+
+    /* Just hand this one over to all sink_inputs */
+    PA_LLIST_FOREACH(o, u->thread_info.active_outputs) {
+        pa_asyncmsgq_post(o->control_inq, PA_MSGOBJECT(o->sink_input), SINK_INPUT_MESSAGE_SET_REQUESTED_LATENCY, NULL,
+                          u->block_usec, NULL, 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;
+
+    switch (code) {
+
+        case PA_SINK_MESSAGE_GET_LATENCY: {
+            pa_usec_t x, y, c;
+            int64_t *delay = data;
+
+            x = pa_rtclock_now();
+            y = pa_smoother_get(u->thread_info.smoother, x);
+
+            c = pa_bytes_to_usec(u->thread_info.counter, &u->sink->sample_spec);
+
+            *delay = (int64_t)c - y;
+
+            return 0;
+        }
+
+        case SINK_MESSAGE_ADD_OUTPUT:
+            output_add_within_thread(data);
+            update_max_request(u);
+            update_latency_range(u);
+            return 0;
+
+        case SINK_MESSAGE_REMOVE_OUTPUT:
+            output_remove_within_thread(data);
+            update_max_request(u);
+            update_latency_range(u);
+            return 0;
+
+        case SINK_MESSAGE_NEED:
+            render_memblock(u, (struct output*) data, (size_t) offset);
+            return 0;
+
+        case SINK_MESSAGE_UPDATE_LATENCY: {
+            pa_usec_t x, y, latency = (pa_usec_t) offset;
+
+            x = pa_rtclock_now();
+            y = pa_bytes_to_usec(u->thread_info.counter, &u->sink->sample_spec);
+
+            if (y > latency)
+                y -= latency;
+            else
+                y = 0;
+
+            pa_smoother_put(u->thread_info.smoother, x, y);
+            return 0;
+        }
+
+        case SINK_MESSAGE_UPDATE_MAX_REQUEST:
+            update_max_request(u);
+            break;
+
+        case SINK_MESSAGE_UPDATE_LATENCY_RANGE:
+            update_latency_range(u);
+            break;
+
+}
+
+    return pa_sink_process_msg(o, code, data, offset, chunk);
+}
+
+static void update_description(struct userdata *u) {
+    bool first = true;
+    char *t;
+    struct output *o;
+    uint32_t idx;
+
+    pa_assert(u);
+
+    if (!u->auto_desc)
+        return;
+
+    if (pa_idxset_isempty(u->outputs)) {
+        pa_sink_set_description(u->sink, "Simultaneous output");
+        return;
+    }
+
+    t = pa_xstrdup("Simultaneous output to");
+
+    PA_IDXSET_FOREACH(o, u->outputs, idx) {
+        char *e;
+
+        if (first) {
+            e = pa_sprintf_malloc("%s %s", t, pa_strnull(pa_proplist_gets(o->sink->proplist, PA_PROP_DEVICE_DESCRIPTION)));
+            first = false;
+        } else
+            e = pa_sprintf_malloc("%s, %s", t, pa_strnull(pa_proplist_gets(o->sink->proplist, PA_PROP_DEVICE_DESCRIPTION)));
+
+        pa_xfree(t);
+        t = e;
+    }
+
+    pa_sink_set_description(u->sink, t);
+    pa_xfree(t);
+}
+
+static int output_create_sink_input(struct output *o) {
+    struct userdata *u;
+    pa_sink_input_new_data data;
+
+    pa_assert(o);
+
+    if (o->sink_input)
+        return 0;
+
+    u = o->userdata;
+
+    pa_sink_input_new_data_init(&data);
+    pa_sink_input_new_data_set_sink(&data, o->sink, false, true);
+    data.driver = __FILE__;
+    pa_proplist_setf(data.proplist, PA_PROP_MEDIA_NAME, "Simultaneous output on %s", pa_strnull(pa_proplist_gets(o->sink->proplist, PA_PROP_DEVICE_DESCRIPTION)));
+    pa_proplist_sets(data.proplist, PA_PROP_MEDIA_ROLE, "filter");
+    pa_sink_input_new_data_set_sample_spec(&data, &u->sink->sample_spec);
+    pa_sink_input_new_data_set_channel_map(&data, &u->sink->channel_map);
+    data.module = u->module;
+    data.resample_method = u->resample_method;
+    data.flags = PA_SINK_INPUT_VARIABLE_RATE|PA_SINK_INPUT_DONT_MOVE|PA_SINK_INPUT_NO_CREATE_ON_SUSPEND;
+
+    pa_sink_input_new(&o->sink_input, u->core, &data);
+
+    pa_sink_input_new_data_done(&data);
+
+    if (!o->sink_input)
+        return -1;
+
+    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->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_latency_range = sink_input_update_sink_latency_range_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;
+    o->sink_input->userdata = o;
+
+    pa_sink_input_set_requested_latency(o->sink_input, pa_sink_get_requested_latency(u->sink));
+
+    return 0;
+}
+
+/* Called from main context */
+static struct output *output_new(struct userdata *u, pa_sink *sink) {
+    struct output *o;
+
+    pa_assert(u);
+    pa_assert(sink);
+    pa_assert(u->sink);
+
+    o = pa_xnew0(struct output, 1);
+    o->userdata = u;
+
+    o->audio_inq = pa_asyncmsgq_new(0);
+    if (!o->audio_inq) {
+        pa_log("pa_asyncmsgq_new() failed.");
+        goto fail;
+    }
+
+    o->control_inq = pa_asyncmsgq_new(0);
+    if (!o->control_inq) {
+        pa_log("pa_asyncmsgq_new() failed.");
+        goto fail;
+    }
+
+    o->outq = pa_asyncmsgq_new(0);
+    if (!o->outq) {
+        pa_log("pa_asyncmsgq_new() failed.");
+        goto fail;
+    }
+
+    o->sink = sink;
+    o->memblockq = pa_memblockq_new(
+            "module-combine-sink output memblockq",
+            0,
+            MEMBLOCKQ_MAXLENGTH,
+            MEMBLOCKQ_MAXLENGTH,
+            &u->sink->sample_spec,
+            1,
+            0,
+            0,
+            &u->sink->silence);
+
+    pa_assert_se(pa_idxset_put(u->outputs, o, NULL) == 0);
+    update_description(u);
+
+    return o;
+
+fail:
+    output_free(o);
+
+    return NULL;
+}
+
+/* Called from main context */
+static void output_free(struct output *o) {
+    pa_assert(o);
+
+    output_disable(o);
+    update_description(o->userdata);
+
+    if (o->audio_inq_rtpoll_item_read)
+        pa_rtpoll_item_free(o->audio_inq_rtpoll_item_read);
+    if (o->audio_inq_rtpoll_item_write)
+        pa_rtpoll_item_free(o->audio_inq_rtpoll_item_write);
+
+    if (o->control_inq_rtpoll_item_read)
+        pa_rtpoll_item_free(o->control_inq_rtpoll_item_read);
+    if (o->control_inq_rtpoll_item_write)
+        pa_rtpoll_item_free(o->control_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->audio_inq)
+        pa_asyncmsgq_unref(o->audio_inq);
+
+    if (o->control_inq)
+        pa_asyncmsgq_unref(o->control_inq);
+
+    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 (output_create_sink_input(o) >= 0) {
+
+        if (o->sink->state != PA_SINK_INIT) {
+            /* Enable the sink input. That means that the sink
+             * is now asked for new data. */
+            pa_sink_input_put(o->sink_input);
+        }
+    }
+
+    o->ignore_state_change = false;
+}
+
+/* Called from main context */
+static void output_disable(struct output *o) {
+    pa_assert(o);
+
+    if (!o->sink_input)
+        return;
+
+    /* We disable the sink input. That means that the sink is
+     * not asked for new data anymore  */
+    pa_sink_input_unlink(o->sink_input);
+
+    /* Now deallocate the stream */
+    pa_sink_input_unref(o->sink_input);
+    o->sink_input = NULL;
+
+    /* Finally, drop all queued data */
+    pa_memblockq_flush_write(o->memblockq, true);
+    pa_asyncmsgq_flush(o->audio_inq, false);
+    pa_asyncmsgq_flush(o->control_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(o->userdata->sink->state))
+        output_enable(o);
+    else
+        output_disable(o);
+}
+
+/* Called from main context */
+static bool 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->flags & PA_SINK_LATENCY))
+        return false;
+
+    if ((t = pa_proplist_gets(s->proplist, PA_PROP_DEVICE_CLASS)))
+        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;
+
+    pa_core_assert_ref(c);
+    pa_sink_assert_ref(s);
+    pa_assert(u);
+
+    if (u->automatic) {
+        if (!is_suitable_sink(u, s))
+            return PA_HOOK_OK;
+    } else {
+        /* Check if the sink is a previously unlinked slave (non-automatic mode) */
+        pa_strlist *l = u->unlinked_slaves;
+
+        while (l && !pa_streq(pa_strlist_data(l), s->name))
+            l = pa_strlist_next(l);
+
+        if (!l)
+            return PA_HOOK_OK;
+
+        u->unlinked_slaves = pa_strlist_remove(u->unlinked_slaves, s->name);
+    }
+
+    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;
+    }
+
+    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;
+
+    pa_assert(u);
+    pa_assert(s);
+
+    if (u->sink == s)
+        return NULL;
+
+    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;
+
+    pa_assert(c);
+    pa_sink_assert_ref(s);
+    pa_assert(u);
+
+    if (!(o = find_output(u, s)))
+        return PA_HOOK_OK;
+
+    pa_log_info("Unconfiguring sink: %s", s->name);
+
+    if (!u->automatic)
+        u->unlinked_slaves = pa_strlist_prepend(u->unlinked_slaves, s->name);
+
+    pa_idxset_remove_by_data(u->outputs, o, NULL);
+    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;
+
+    if (!(o = find_output(u, s)))
+        return PA_HOOK_OK;
+
+    /* 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;
+
+    output_verify(o);
+
+    return PA_HOOK_OK;
+}
+
+int pa__init(pa_module*m) {
+    struct userdata *u;
+    pa_modargs *ma = NULL;
+    const char *slaves, *rm;
+    int resample_method = PA_RESAMPLER_TRIVIAL;
+    pa_sample_spec ss;
+    pa_channel_map map;
+    struct output *o;
+    uint32_t idx;
+    pa_sink_new_data data;
+    uint32_t adjust_time_sec;
+    size_t nbytes;
+
+    pa_assert(m);
+
+    if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
+        pa_log("failed to parse module arguments");
+        goto fail;
+    }
+
+    if ((rm = pa_modargs_get_value(ma, "resample_method", NULL))) {
+        if ((resample_method = pa_parse_resample_method(rm)) < 0) {
+            pa_log("invalid resample method '%s'", rm);
+            goto fail;
+        }
+    }
+
+    m->userdata = u = pa_xnew0(struct userdata, 1);
+    u->core = m->core;
+    u->module = m;
+    u->rtpoll = pa_rtpoll_new();
+
+    if (pa_thread_mq_init(&u->thread_mq, m->core->mainloop, u->rtpoll) < 0) {
+        pa_log("pa_thread_mq_init() failed.");
+        goto fail;
+    }
+
+    u->resample_method = resample_method;
+    u->outputs = pa_idxset_new(NULL, NULL);
+    u->thread_info.smoother = pa_smoother_new(
+            PA_USEC_PER_SEC,
+            PA_USEC_PER_SEC*2,
+            true,
+            true,
+            10,
+            pa_rtclock_now(),
+            true);
+
+    adjust_time_sec = DEFAULT_ADJUST_TIME_USEC / PA_USEC_PER_SEC;
+    if (pa_modargs_get_value_u32(ma, "adjust_time", &adjust_time_sec) < 0) {
+        pa_log("Failed to parse adjust_time value");
+        goto fail;
+    }
+
+    if (adjust_time_sec != DEFAULT_ADJUST_TIME_USEC / PA_USEC_PER_SEC)
+        u->adjust_time = adjust_time_sec * PA_USEC_PER_SEC;
+    else
+        u->adjust_time = DEFAULT_ADJUST_TIME_USEC;
+
+    slaves = pa_modargs_get_value(ma, "slaves", NULL);
+    u->automatic = !slaves;
+
+    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;
+        bool is_first_slave = true;
+
+        pa_sample_spec_init(&slaves_spec);
+
+        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;
+    }
+
+    pa_sink_new_data_init(&data);
+    data.namereg_fail = false;
+    data.driver = __FILE__;
+    data.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_CLASS, "filter");
+
+    if (slaves)
+        pa_proplist_sets(data.proplist, "combine.slaves", slaves);
+
+    if (pa_modargs_get_proplist(ma, "sink_properties", data.proplist, PA_UPDATE_REPLACE) < 0) {
+        pa_log("Invalid properties");
+        pa_sink_new_data_done(&data);
+        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_DYNAMIC_LATENCY);
+    pa_sink_new_data_done(&data);
+
+    if (!u->sink) {
+        pa_log("Failed to create sink");
+        goto fail;
+    }
+
+    u->sink->parent.process_msg = sink_process_msg;
+    u->sink->set_state_in_main_thread = sink_set_state_in_main_thread_cb;
+    u->sink->set_state_in_io_thread = sink_set_state_in_io_thread_cb;
+    u->sink->update_requested_latency = sink_update_requested_latency;
+    u->sink->userdata = u;
+
+    pa_sink_set_rtpoll(u->sink, u->rtpoll);
+    pa_sink_set_asyncmsgq(u->sink, u->thread_mq.inq);
+
+    nbytes = pa_usec_to_bytes(BLOCK_USEC, &u->sink->sample_spec);
+    pa_sink_set_max_request(u->sink, nbytes);
+    pa_sink_set_latency_range(u->sink, 0, BLOCK_USEC);
+    /* pulse clamps the range, get the real values */
+    u->default_min_latency = u->sink->thread_info.min_latency;
+    u->default_max_latency = u->sink->thread_info.max_latency;
+    u->block_usec = u->sink->thread_info.max_latency;
+
+
+    if (!u->automatic) {
+        const char*split_state;
+        char *n = NULL;
+        pa_assert(slaves);
+
+        /* The slaves have been specified manually */
+
+        split_state = NULL;
+        while ((n = pa_split(slaves, ",", &split_state))) {
+            pa_sink *slave_sink;
+
+            if (!(slave_sink = pa_namereg_get(m->core, n, PA_NAMEREG_SINK)) || slave_sink == u->sink) {
+                pa_log("Invalid slave sink '%s'", n);
+                pa_xfree(n);
+                goto fail;
+            }
+
+            pa_xfree(n);
+
+            if (!output_new(u, slave_sink)) {
+                pa_log("Failed to create slave sink input on sink '%s'.", slave_sink->name);
+                goto fail;
+            }
+        }
+
+        if (pa_idxset_size(u->outputs) <= 1)
+            pa_log_warn("No slave sinks specified.");
+
+        u->sink_put_slot = NULL;
+
+    } else {
+        pa_sink *s;
+
+        /* We're in automatic mode, we add every sink that matches our needs  */
+
+        PA_IDXSET_FOREACH(s, m->core->sinks, idx) {
+
+            if (!is_suitable_sink(u, s))
+                continue;
+
+            if (!output_new(u, s)) {
+                pa_log("Failed to create sink input on sink '%s'.", s->name);
+                goto fail;
+            }
+        }
+    }
+
+    u->sink_put_slot = pa_hook_connect(&m->core->hooks[PA_CORE_HOOK_SINK_PUT], PA_HOOK_LATE, (pa_hook_cb_t) sink_put_hook_cb, u);
+    u->sink_unlink_slot = pa_hook_connect(&m->core->hooks[PA_CORE_HOOK_SINK_UNLINK], PA_HOOK_EARLY, (pa_hook_cb_t) sink_unlink_hook_cb, u);
+    u->sink_state_changed_slot = pa_hook_connect(&m->core->hooks[PA_CORE_HOOK_SINK_STATE_CHANGED], PA_HOOK_NORMAL, (pa_hook_cb_t) sink_state_changed_hook_cb, u);
+
+    if (!(u->thread = pa_thread_new("combine", thread_func, u))) {
+        pa_log("Failed to create thread.");
+        goto fail;
+    }
+
+    /* Activate the sink and the sink inputs */
+    pa_sink_put(u->sink);
+
+    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, time_callback, u);
+
+    pa_modargs_free(ma);
+
+    return 0;
+
+fail:
+
+    if (ma)
+        pa_modargs_free(ma);
+
+    pa__done(m);
+
+    return -1;
+}
+
+void pa__done(pa_module*m) {
+    struct userdata *u;
+
+    pa_assert(m);
+
+    if (!(u = m->userdata))
+        return;
+
+    pa_strlist_free(u->unlinked_slaves);
+
+    if (u->sink_put_slot)
+        pa_hook_slot_free(u->sink_put_slot);
+
+    if (u->sink_unlink_slot)
+        pa_hook_slot_free(u->sink_unlink_slot);
+
+    if (u->sink_state_changed_slot)
+        pa_hook_slot_free(u->sink_state_changed_slot);
+
+    if (u->outputs)
+        pa_idxset_free(u->outputs, (pa_free_cb_t) output_free);
+
+    if (u->sink)
+        pa_sink_unlink(u->sink);
+
+    if (u->thread) {
+        pa_asyncmsgq_send(u->thread_mq.inq, NULL, PA_MESSAGE_SHUTDOWN, NULL, 0, NULL);
+        pa_thread_free(u->thread);
+    }
+
+    pa_thread_mq_done(&u->thread_mq);
+
+    if (u->sink)
+        pa_sink_unref(u->sink);
+
+    if (u->rtpoll)
+        pa_rtpoll_free(u->rtpoll);
+
+    if (u->time_event)
+        u->core->mainloop->time_free(u->time_event);
+
+    if (u->thread_info.smoother)
+        pa_smoother_free(u->thread_info.smoother);
+
+    pa_xfree(u);
+}