1) Add flexible seeking support (including absolute) for memory block queues and playback streams

2) Add support to synchronize multiple playback streams
3) add two tests for 1) and 2)
4) s/PA_ERROR/PA_ERR/
5) s/PA_ERROR_OK/PA_OK/
6) update simple API to deal properly with new peek/drop recording API
7) add beginnings of proper validity checking on API calls in client libs (needs to be extended)
8) report playback buffer overflows/underflows to the client
9) move client side recording mcalign stuff into the memblockq 
10) create typedefs for a bunch of API callback prototypes
11) simplify handling of HUP poll() events

Yes, i know, it's usually better to commit a lot of small patches instead of a
single big one. In this case however, this would have contradicted the other
rule: never commit broken or incomplete stuff.

*** This stuff needs a lot of additional testing! ***


git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@511 fefdeb5f-60dc-0310-8127-8f9354f1896f

20 files changed, 1076 insertions, 459 deletions

diff --git a/src/polypcore/iochannel.c b/src/polypcore/iochannel.c
index 7fd09152..c33f593e 100644
--- a/src/polypcore/iochannel.c
+++ b/src/polypcore/iochannel.c
@@ -59,17 +59,17 @@ static void enable_mainloop_sources(pa_iochannel *io) {
         pa_io_event_flags_t f = PA_IO_EVENT_NULL;
         assert(io->input_event);
         
-        if (!io->readable)
+        if (!pa_iochannel_is_readable(io))
             f |= PA_IO_EVENT_INPUT;
-        if (!io->writable)
+        if (!pa_iochannel_is_writable(io))
             f |= PA_IO_EVENT_OUTPUT;
 
         io->mainloop->io_enable(io->input_event, f);
     } else {
         if (io->input_event)
-            io->mainloop->io_enable(io->input_event, io->readable ? PA_IO_EVENT_NULL : PA_IO_EVENT_INPUT);
+            io->mainloop->io_enable(io->input_event, pa_iochannel_is_readable(io) ? PA_IO_EVENT_NULL : PA_IO_EVENT_INPUT);
         if (io->output_event)
-            io->mainloop->io_enable(io->output_event, io->writable ? PA_IO_EVENT_NULL : PA_IO_EVENT_OUTPUT);
+            io->mainloop->io_enable(io->output_event, pa_iochannel_is_writable(io) ? PA_IO_EVENT_NULL : PA_IO_EVENT_OUTPUT);
     }
 }
 
@@ -82,33 +82,21 @@ static void callback(pa_mainloop_api* m, pa_io_event *e, int fd, pa_io_event_fla
     assert(fd >= 0);
     assert(userdata);
 
-    if ((f & (PA_IO_EVENT_HANGUP|PA_IO_EVENT_ERROR)) && !io->hungup) {
+    if ((f & (PA_IO_EVENT_HANGUP|PA_IO_EVENT_ERROR)) & !io->hungup) {
         io->hungup = 1;
         changed = 1;
+    }
 
-        if (e == io->input_event) {
-            io->mainloop->io_free(io->input_event);
-            io->input_event = NULL;
-
-            if (io->output_event == e)
-                io->output_event = NULL;
-        } else if (e == io->output_event) {
-            io->mainloop->io_free(io->output_event);
-            io->output_event = NULL;
-        }
-    } else {
-
-        if ((f & PA_IO_EVENT_INPUT) && !io->readable) {
-            io->readable = 1;
-            changed = 1;
-            assert(e == io->input_event);
-        }
-        
-        if ((f & PA_IO_EVENT_OUTPUT) && !io->writable) {
-            io->writable = 1;
-            changed = 1;
-            assert(e == io->output_event);
-        }
+    if ((f & PA_IO_EVENT_INPUT) && !io->readable) {
+        io->readable = 1;
+        changed = 1;
+        assert(e == io->input_event);
+    }
+    
+    if ((f & PA_IO_EVENT_OUTPUT) && !io->writable) {
+        io->writable = 1;
+        changed = 1;
+        assert(e == io->output_event);
     }
 
     if (changed) {
@@ -217,6 +205,7 @@ ssize_t pa_iochannel_write(pa_iochannel*io, const void*data, size_t l) {
     if (r < 0)
 #endif
         r = write(io->ofd, data, l);
+
     if (r >= 0) {
         io->writable = 0;
         enable_mainloop_sources(io);
diff --git a/src/polypcore/llist.h b/src/polypcore/llist.h
index eb8cd017..c54742d3 100644
--- a/src/polypcore/llist.h
+++ b/src/polypcore/llist.h
@@ -66,4 +66,14 @@
                                     _item->next = _item->prev = NULL; \
                                     } while(0)
 
+#define PA_LLIST_FIND_HEAD(t,item,head) \
+do { \
+    t **_head = (head), *_item = (item); \
+    *_head = _item; \
+    assert(_head); \
+    while ((*_head)->prev) \
+        *_head = (*_head)->prev; \
+} while (0) \
+
+
 #endif
diff --git a/src/polypcore/mcalign.c b/src/polypcore/mcalign.c
index 0f229e28..f90fd7e8 100644
--- a/src/polypcore/mcalign.c
+++ b/src/polypcore/mcalign.c
@@ -43,6 +43,7 @@ pa_mcalign *pa_mcalign_new(size_t base, pa_memblock_stat *s) {
     assert(base);
 
     m = pa_xnew(pa_mcalign, 1);
+    
     m->base = base;
     pa_memchunk_reset(&m->leftover);
     pa_memchunk_reset(&m->current);
@@ -64,11 +65,16 @@ void pa_mcalign_free(pa_mcalign *m) {
 }
 
 void pa_mcalign_push(pa_mcalign *m, const pa_memchunk *c) {
-    assert(m && c && c->memblock && c->length);
+    assert(m);
+    assert(c);
+    
+    assert(c->memblock);
+    assert(c->length > 0);
+
+    assert(!m->current.memblock);
     
     /* Append to the leftover memory block */
     if (m->leftover.memblock) {
-        assert(!m->current.memblock);
         
         /* Try to merge */
         if (m->leftover.memblock == c->memblock &&
@@ -110,8 +116,6 @@ void pa_mcalign_push(pa_mcalign *m, const pa_memchunk *c) {
             }
         }
     } else {
-        assert(!m->leftover.memblock && !m->current.memblock);
-
         /* Nothing to merge or copy, just store it */
         
         if (c->length >= m->base)
@@ -124,7 +128,8 @@ void pa_mcalign_push(pa_mcalign *m, const pa_memchunk *c) {
 }
 
 int pa_mcalign_pop(pa_mcalign *m, pa_memchunk *c) {
-    assert(m && c);
+    assert(m);
+    assert(c);
 
     /* First test if there's a leftover memory block available */
     if (m->leftover.memblock) {
@@ -187,3 +192,15 @@ int pa_mcalign_pop(pa_mcalign *m, pa_memchunk *c) {
     return -1;
     
 }
+
+size_t pa_mcalign_csize(pa_mcalign *m, size_t l) {
+    assert(m);
+    assert(l > 0);
+
+    assert(!m->current.memblock);
+           
+    if (m->leftover.memblock)
+        l += m->leftover.length;
+    
+    return (l/m->base)*m->base;
+}
diff --git a/src/polypcore/mcalign.h b/src/polypcore/mcalign.h
index a9107e0e..58019462 100644
--- a/src/polypcore/mcalign.h
+++ b/src/polypcore/mcalign.h
@@ -74,4 +74,7 @@ void pa_mcalign_push(pa_mcalign *m, const pa_memchunk *c);
  * nonzero otherwise. */
 int pa_mcalign_pop(pa_mcalign *m, pa_memchunk *c);
 
+/* If we pass l bytes in now, how many bytes would we get out? */
+size_t pa_mcalign_csize(pa_mcalign *m, size_t l);
+
 #endif
diff --git a/src/polypcore/memblock.c b/src/polypcore/memblock.c
index 2c0bef57..04e8436f 100644
--- a/src/polypcore/memblock.c
+++ b/src/polypcore/memblock.c
@@ -111,13 +111,16 @@ pa_memblock *pa_memblock_new_user(void *d, size_t length, void (*free_cb)(void *
 }
 
 pa_memblock* pa_memblock_ref(pa_memblock*b) {
-    assert(b && b->ref >= 1);
+    assert(b);
+    assert(b->ref >= 1);
+    
     b->ref++;
     return b;
 }
 
 void pa_memblock_unref(pa_memblock*b) {
-    assert(b && b->ref >= 1);
+    assert(b);
+    assert(b->ref >= 1);
 
     if ((--(b->ref)) == 0) {
         stat_remove(b);
diff --git a/src/polypcore/memblock.h b/src/polypcore/memblock.h
index c5751406..9471278a 100644
--- a/src/polypcore/memblock.h
+++ b/src/polypcore/memblock.h
@@ -79,7 +79,6 @@ references to the memory. This causes the memory to be copied and
 converted into a PA_MEMBLOCK_DYNAMIC type memory block */
 void pa_memblock_unref_fixed(pa_memblock*b);
 
-
 pa_memblock_stat* pa_memblock_stat_new(void);
 void pa_memblock_stat_unref(pa_memblock_stat *s);
 pa_memblock_stat * pa_memblock_stat_ref(pa_memblock_stat *s);
diff --git a/src/polypcore/memblockq.c b/src/polypcore/memblockq.c
index 4a0225e5..05c810bd 100644
--- a/src/polypcore/memblockq.c
+++ b/src/polypcore/memblockq.c
@@ -38,30 +38,45 @@
 
 struct memblock_list {
     struct memblock_list *next, *prev;
+    int64_t index;
     pa_memchunk chunk;
 };
 
 struct pa_memblockq {
     struct memblock_list *blocks, *blocks_tail;
     unsigned n_blocks;
-    size_t current_length, maxlength, tlength, base, prebuf, orig_prebuf, minreq;
-    pa_mcalign *mcalign;
+    size_t maxlength, tlength, base, prebuf, minreq;
+    int64_t read_index, write_index;
+    enum { PREBUF, RUNNING } state;
     pa_memblock_stat *memblock_stat;
+    pa_memblock *silence;
+    pa_mcalign *mcalign;
 };
 
-pa_memblockq* pa_memblockq_new(size_t maxlength, size_t tlength, size_t base, size_t prebuf, size_t minreq, pa_memblock_stat *s) {
+pa_memblockq* pa_memblockq_new(
+        int64_t idx,
+        size_t maxlength,
+        size_t tlength,
+        size_t base,
+        size_t prebuf,
+        size_t minreq,
+        pa_memblock *silence,
+        pa_memblock_stat *s) {
+    
     pa_memblockq* bq;
-    assert(maxlength && base && maxlength);
     
-    bq = pa_xmalloc(sizeof(pa_memblockq));
-    bq->blocks = bq->blocks_tail = 0;
+    assert(base > 0);
+    assert(maxlength >= base);
+    
+    bq = pa_xnew(pa_memblockq, 1);
+    bq->blocks = bq->blocks_tail = NULL;
     bq->n_blocks = 0;
 
-    bq->current_length = 0;
+    bq->base = base;
+    bq->read_index = bq->write_index = idx;
+    bq->memblock_stat = s;
 
     pa_log_debug(__FILE__": memblockq requested: maxlength=%u, tlength=%u, base=%u, prebuf=%u, minreq=%u\n", maxlength, tlength, base, prebuf, minreq);
-    
-    bq->base = base;
 
     bq->maxlength = ((maxlength+base-1)/base)*base;
     assert(bq->maxlength >= base);
@@ -70,26 +85,25 @@ pa_memblockq* pa_memblockq_new(size_t maxlength, size_t tlength, size_t base, si
     if (!bq->tlength || bq->tlength >= bq->maxlength)
         bq->tlength = bq->maxlength;
 
-    bq->minreq = (minreq/base)*base;
-    if (bq->minreq == 0)
-        bq->minreq = 1;
-    
-    bq->prebuf = (prebuf == (size_t) -1) ? bq->maxlength/2 : prebuf;
-    bq->prebuf = (bq->prebuf/base)*base;
+    bq->prebuf = (prebuf == (size_t) -1) ? bq->tlength/2 : prebuf;
+    bq->prebuf = ((bq->prebuf+base-1)/base)*base;
     if (bq->prebuf > bq->maxlength)
         bq->prebuf = bq->maxlength;
 
-    if (bq->prebuf > bq->tlength - bq->minreq)
-        bq->prebuf = bq->tlength - bq->minreq;
+    bq->minreq = (minreq/base)*base;
+    
+    if (bq->minreq > bq->tlength - bq->prebuf)
+        bq->minreq = bq->tlength - bq->prebuf;
 
-    bq->orig_prebuf = bq->prebuf;
+    if (!bq->minreq)
+        bq->minreq = 1;
     
     pa_log_debug(__FILE__": memblockq sanitized: maxlength=%u, tlength=%u, base=%u, prebuf=%u, minreq=%u\n", bq->maxlength, bq->tlength, bq->base, bq->prebuf, bq->minreq);
-    
-    bq->mcalign = NULL;
-
-    bq->memblock_stat = s;
 
+    bq->state = bq->prebuf ? PREBUF : RUNNING;
+    bq->silence = silence ? pa_memblock_ref(silence) : NULL;
+    bq->mcalign = NULL;
+    
     return bq;
 }
 
@@ -97,248 +111,510 @@ void pa_memblockq_free(pa_memblockq* bq) {
     assert(bq);
 
     pa_memblockq_flush(bq);
-    
+
+    if (bq->silence)
+        pa_memblock_unref(bq->silence);
+
     if (bq->mcalign)
         pa_mcalign_free(bq->mcalign);
-
+    
     pa_xfree(bq);
 }
 
-void pa_memblockq_push(pa_memblockq* bq, const pa_memchunk *chunk, size_t delta) {
-    struct memblock_list *q;
-    assert(bq && chunk && chunk->memblock && chunk->length && (chunk->length % bq->base) == 0);
-
-    pa_memblockq_seek(bq, delta);
-    
-    if (bq->blocks_tail && bq->blocks_tail->chunk.memblock == chunk->memblock) {
-        /* Try to merge memory chunks */
+static void drop_block(pa_memblockq *bq, struct memblock_list *q) {
+    assert(bq);
+    assert(q);
 
-        if (bq->blocks_tail->chunk.index+bq->blocks_tail->chunk.length == chunk->index) {
-            bq->blocks_tail->chunk.length += chunk->length;
-            bq->current_length += chunk->length;
-            return;
-        }
-    }
+    assert(bq->n_blocks >= 1);
     
-    q = pa_xmalloc(sizeof(struct memblock_list));
-
-    q->chunk = *chunk;
-    pa_memblock_ref(q->chunk.memblock);
-    assert(q->chunk.index+q->chunk.length <= q->chunk.memblock->length);
-    q->next = NULL;
-    if ((q->prev = bq->blocks_tail))
-        bq->blocks_tail->next = q;
+    if (q->prev)
+        q->prev->next = q->next;
     else
-        bq->blocks = q;
+        bq->blocks = q->next;
     
-    bq->blocks_tail = q;
+    if (q->next)
+        q->next->prev = q->prev;
+    else
+        bq->blocks_tail = q->prev;
 
-    bq->n_blocks++;
-    bq->current_length += chunk->length;
+    pa_memblock_unref(q->chunk.memblock);
+    pa_xfree(q);
 
-    pa_memblockq_shorten(bq, bq->maxlength);
+    bq->n_blocks--;
 }
 
-int pa_memblockq_peek(pa_memblockq* bq, pa_memchunk *chunk) {
-    assert(bq && chunk);
+static int can_push(pa_memblockq *bq, size_t l) {
+    int64_t end;
 
-    if (!bq->blocks || bq->current_length < bq->prebuf)
-        return -1;
+    assert(bq);
 
-    bq->prebuf = 0;
+    if (bq->read_index > bq->write_index) {
+        int64_t d =  bq->read_index - bq->write_index;
 
-    *chunk = bq->blocks->chunk;
-    pa_memblock_ref(chunk->memblock);
+        if (l > d)
+            l -= d;
+        else
+            return 1;
+    }
 
-    return 0;
+    end = bq->blocks_tail ? bq->blocks_tail->index + bq->blocks_tail->chunk.length : 0;
+
+    /* Make sure that the list doesn't get too long */
+    if (bq->write_index + l > end)
+        if (bq->write_index + l - bq->read_index > bq->maxlength)
+            return 0;
+
+    return 1;
 }
 
-void pa_memblockq_drop(pa_memblockq *bq, const pa_memchunk *chunk, size_t length) {
-    assert(bq && chunk && length);
+int pa_memblockq_push(pa_memblockq* bq, const pa_memchunk *uchunk) {
+    
+    struct memblock_list *q, *n;
+    pa_memchunk chunk;
+    
+    assert(bq);
+    assert(uchunk);
+    assert(uchunk->memblock);
+    assert(uchunk->length > 0);
+    assert(uchunk->index + uchunk->length <= uchunk->memblock->length);
+
+    if (uchunk->length % bq->base)
+        return -1;
+
+    if (!can_push(bq, uchunk->length))
+        return -1;
 
-    if (!bq->blocks || memcmp(&bq->blocks->chunk, chunk, sizeof(pa_memchunk))) 
-        return;
+    chunk = *uchunk;
     
-    assert(length <= bq->blocks->chunk.length);
-    pa_memblockq_skip(bq, length);
-}
+    if (bq->read_index > bq->write_index) {
 
-static void remove_block(pa_memblockq *bq, struct memblock_list *q) {
-    assert(bq && q);
+        /* We currently have a buffer underflow, we need to drop some
+         * incoming data */
 
-    if (q->prev)
-        q->prev->next = q->next;
-    else {
-        assert(bq->blocks == q);
-        bq->blocks = q->next;
+        int64_t d = bq->read_index - bq->write_index;
+
+        if (chunk.length > d) {
+            chunk.index += d;
+            chunk.length -= d;
+            bq->write_index = bq->read_index;
+        } else {
+            /* We drop the incoming data completely */
+            bq->write_index += chunk.length;
+            return 0;
+        }
     }
     
-    if (q->next)
-        q->next->prev = q->prev;
-    else {
-        assert(bq->blocks_tail == q);
-        bq->blocks_tail = q->prev;
+    /* We go from back to front to look for the right place to add
+     * this new entry. Drop data we will overwrite on the way */
+
+    q = bq->blocks_tail;
+    while (q) {
+
+        if (bq->write_index >= q->index + q->chunk.length)
+            /* We found the entry where we need to place the new entry immediately after */
+            break;
+        else if (bq->write_index + chunk.length <= q->index) {
+            /* This entry isn't touched at all, let's skip it */
+            q = q->prev;
+        } else if (bq->write_index <= q->index &&
+            bq->write_index + chunk.length >= q->index + q->chunk.length) {
+
+            /* This entry is fully replaced by the new entry, so let's drop it */
+
+            struct memblock_list *p;
+            p = q;
+            q = q->prev;
+            drop_block(bq, p);
+        } else if (bq->write_index >= q->index) {
+            /* The write index points into this memblock, so let's
+             * truncate or split it */
+
+            if (bq->write_index + chunk.length < q->index + q->chunk.length) {
+
+                /* We need to save the end of this memchunk */
+                struct memblock_list *p;
+                size_t d;
+
+                /* Create a new list entry for the end of thie memchunk */
+                p = pa_xnew(struct memblock_list, 1);
+                p->chunk = q->chunk;
+                pa_memblock_ref(p->chunk.memblock);
+
+                /* Calculate offset */
+                d = bq->write_index + chunk.length - q->index;
+                assert(d > 0);
+
+                /* Drop it from the new entry */
+                p->index = q->index + d;
+                p->chunk.length -= d;
+
+                /* Add it to the list */
+                p->prev = q;
+                if ((p->next = q->next))
+                    q->next->prev = p;
+                else
+                    bq->blocks_tail = p;
+                q->next = p;
+
+                bq->n_blocks++;
+            }
+
+            /* Truncate the chunk */
+            if (!(q->chunk.length = bq->write_index - q->index)) {
+                struct memblock_list *p;
+                p = q;
+                q = q->prev;
+                drop_block(bq, p);
+            }
+
+            /* We had to truncate this block, hence we're now at the right position */
+            break;
+        } else {
+            size_t d;
+
+            assert(bq->write_index + chunk.length > q->index &&
+                   bq->write_index + chunk.length < q->index + q->chunk.length &&
+                   bq->write_index < q->index);
+            
+            /* The job overwrites the current entry at the end, so let's drop the beginning of this entry */
+
+            d = bq->write_index + chunk.length - q->index;
+            q->index += d;
+            q->chunk.index += d;
+            q->chunk.length -= d;
+            
+            q = q->prev;
+        }
+        
     }
+
+    if (q) {
+        assert(bq->write_index >=  q->index + q->chunk.length);
+        assert(!q->next || (bq->write_index+chunk.length <= q->next->index));
+               
+        /* Try to merge memory blocks */
+        
+        if (q->chunk.memblock == chunk.memblock &&
+            q->chunk.index + q->chunk.length == chunk.index &&
+            bq->write_index == q->index + q->chunk.length) {
+            
+            q->chunk.length += chunk.length;
+            bq->write_index += chunk.length;
+            return 0;
+        }
+    } else
+        assert(!bq->blocks || (bq->write_index+chunk.length <= bq->blocks->index));
+
+
+    n = pa_xnew(struct memblock_list, 1);
+    n->chunk = chunk;
+    pa_memblock_ref(n->chunk.memblock);
+    n->index = bq->write_index;
+    bq->write_index += n->chunk.length;
+
+    n->next = q ? q->next : bq->blocks;
+    n->prev = q;
+
+    if (n->next)
+        n->next->prev = n;
+    else
+        bq->blocks_tail = n;
+
+    if (n->prev)
+        n->prev->next = n;
+    else
+        bq->blocks = n;
     
-    pa_memblock_unref(q->chunk.memblock);
-    pa_xfree(q);
-    
-    bq->n_blocks--;
+    bq->n_blocks++;
+    return 0;
 }
 
-void pa_memblockq_skip(pa_memblockq *bq, size_t length) {
-    assert(bq && length && (length % bq->base) == 0);
+int pa_memblockq_peek(pa_memblockq* bq, pa_memchunk *chunk) {
+    assert(bq);
+    assert(chunk);
 
-    while (length > 0) {
-        size_t l = length;
-        assert(bq->blocks && bq->current_length >= length);
-        
-        if (l > bq->blocks->chunk.length)
-            l = bq->blocks->chunk.length;
+    if (bq->state == PREBUF) {
 
-        bq->blocks->chunk.index += l;
-        bq->blocks->chunk.length -= l;
-        bq->current_length -= l;
-        
-        if (!bq->blocks->chunk.length)
-            remove_block(bq, bq->blocks);
+        /* We need to pre-buffer */
+        if (pa_memblockq_get_length(bq) < bq->prebuf)
+            return -1;
+
+        bq->state = RUNNING;
 
-        length -= l;
+    } else if (bq->prebuf > 0 && bq->read_index >= bq->write_index) {
+
+        /* Buffer underflow protection */
+        bq->state = PREBUF;
+        return -1;
     }
-}
+    
+    /* Do we need to spit out silence? */
+    if (!bq->blocks || bq->blocks->index > bq->read_index) {
 
-void pa_memblockq_shorten(pa_memblockq *bq, size_t length) {
-    size_t l;
-    assert(bq);
+        size_t length;
+
+        /* How much silence shall we return? */
+        length = bq->blocks ? bq->blocks->index - bq->read_index : 0;
+
+        /* We need to return silence, since no data is yet available */
+        if (bq->silence) {
+            chunk->memblock = pa_memblock_ref(bq->silence);
 
-    if (bq->current_length <= length)
-        return;
+            if (!length || length > chunk->memblock->length)
+                length = chunk->memblock->length;
+                
+            chunk->length = length;
+        } else {
+            chunk->memblock = NULL;
+            chunk->length = length;
+        }
+
+        chunk->index = 0;
+        return 0;
+    }
 
-    /*pa_log(__FILE__": Warning! pa_memblockq_shorten()\n");*/
+    /* Ok, let's pass real data to the caller */
+    assert(bq->blocks->index == bq->read_index);
     
-    l = bq->current_length - length;
-    l /= bq->base;
-    l *= bq->base;
+    *chunk = bq->blocks->chunk;
+    pa_memblock_ref(chunk->memblock);
 
-    pa_memblockq_skip(bq, l);
+    return 0;
 }
 
-
-void pa_memblockq_empty(pa_memblockq *bq) {
+void pa_memblockq_drop(pa_memblockq *bq, const pa_memchunk *chunk, size_t length) {
     assert(bq);
-    pa_memblockq_shorten(bq, 0);
+    assert(length % bq->base == 0);
+
+    assert(!chunk || length <= chunk->length);
+
+    if (chunk) {
+
+        if (bq->blocks && bq->blocks->index == bq->read_index) {
+            /* The first item in queue is valid */
+
+            /* Does the chunk match with what the user supplied us? */
+            if (memcmp(chunk, &bq->blocks->chunk, sizeof(pa_memchunk)) != 0)
+                return;
+
+        } else {
+            size_t l;
+
+            /* The first item in the queue is not yet relevant */
+
+            assert(!bq->blocks || bq->blocks->index > bq->read_index);
+            l = bq->blocks ? bq->blocks->index - bq->read_index : 0;
+
+            if (bq->silence) {
+
+                if (!l || l > bq->silence->length)
+                    l = bq->silence->length;
+
+            }
+
+            /* Do the entries still match? */
+            if (chunk->index != 0 || chunk->length != l || chunk->memblock != bq->silence)
+                return;
+        }
+    }
+
+    while (length > 0) {
+
+        if (bq->blocks) {
+            size_t d;
+
+            assert(bq->blocks->index >= bq->read_index);
+
+            d = (size_t) (bq->blocks->index - bq->read_index);
+            
+            if (d >= length) {
+                /* The first block is too far in the future */
+                
+                bq->read_index += length;
+                break;
+            } else {
+                
+                length -= d;
+                bq->read_index += d;
+            }
+
+            assert(bq->blocks->index == bq->read_index);
+
+            if (bq->blocks->chunk.length <= length) {
+                /* We need to drop the full block */
+
+                length -= bq->blocks->chunk.length;
+                bq->read_index += bq->blocks->chunk.length;
+
+                drop_block(bq, bq->blocks);
+            } else {
+                /* Only the start of this block needs to be dropped */
+
+                bq->blocks->chunk.index += length;
+                bq->blocks->chunk.length -= length;
+                bq->blocks->index += length;
+                bq->read_index += length;
+                break;
+            }
+            
+        } else {
+
+            /* The list is empty, there's nothing we could drop */
+            bq->read_index += length;
+            break;
+        }
+    }
 }
 
 int pa_memblockq_is_readable(pa_memblockq *bq) {
     assert(bq);
 
-    return bq->current_length && (bq->current_length >= bq->prebuf);
+    if (bq->prebuf > 0) {
+        size_t l = pa_memblockq_get_length(bq);
+        
+        if (bq->state == PREBUF && l < bq->prebuf)
+            return 0;
+
+        if (l <= 0)
+            return 0;
+    }
+
+    return 1;
 }
 
 int pa_memblockq_is_writable(pa_memblockq *bq, size_t length) {
     assert(bq);
 
-    return bq->current_length + length <= bq->tlength;
+    if (length % bq->base)
+        return 0;
+    
+    return pa_memblockq_get_length(bq) + length <= bq->tlength;
 }
 
-uint32_t pa_memblockq_get_length(pa_memblockq *bq) {
+size_t pa_memblockq_get_length(pa_memblockq *bq) {
     assert(bq);
-    return bq->current_length;
+
+    if (bq->write_index <= bq->read_index)
+        return 0;
+    
+    return (size_t) (bq->write_index - bq->read_index);
 }
 
-uint32_t pa_memblockq_missing(pa_memblockq *bq) {
+size_t pa_memblockq_missing(pa_memblockq *bq) {
     size_t l;
     assert(bq);
 
-    if (bq->current_length >= bq->tlength)
+    if ((l = pa_memblockq_get_length(bq)) >= bq->tlength)
         return 0;
 
-    l = bq->tlength - bq->current_length;
-    assert(l);
-
+    l = bq->tlength - l;
     return (l >= bq->minreq) ? l : 0;
 }
 
-void pa_memblockq_push_align(pa_memblockq* bq, const pa_memchunk *chunk, size_t delta) {
-    pa_memchunk rchunk;
-    assert(bq && chunk && bq->base);
+size_t pa_memblockq_get_minreq(pa_memblockq *bq) {
+    assert(bq);
 
-    if (bq->base == 1) {
-        pa_memblockq_push(bq, chunk, delta);
-        return;
-    }
+    return bq->minreq;
+}
 
-    if (!bq->mcalign) {
-        bq->mcalign = pa_mcalign_new(bq->base, bq->memblock_stat);
-        assert(bq->mcalign);
+void pa_memblockq_seek(pa_memblockq *bq, int64_t offset, pa_seek_mode_t seek) {
+    assert(bq);
+
+    switch (seek) {
+        case PA_SEEK_RELATIVE:
+            bq->write_index += offset;
+            return;
+        case PA_SEEK_ABSOLUTE:
+            bq->write_index = offset;
+            return;
+        case PA_SEEK_RELATIVE_ON_READ:
+            bq->write_index = bq->read_index + offset;
+            return;
+        case PA_SEEK_RELATIVE_END:
+            bq->write_index = (bq->blocks_tail ? bq->blocks_tail->index + bq->blocks_tail->chunk.length : bq->read_index) + offset;
+            return;
     }
+
+    assert(0);
+}
+
+void pa_memblockq_flush(pa_memblockq *bq) {
+    assert(bq);
     
-    pa_mcalign_push(bq->mcalign, chunk);
+    while (bq->blocks)
+        drop_block(bq, bq->blocks);
 
-    while (pa_mcalign_pop(bq->mcalign, &rchunk) >= 0) {
-        pa_memblockq_push(bq, &rchunk, delta);
-        pa_memblock_unref(rchunk.memblock);
-        delta = 0;
-    }
+    assert(bq->n_blocks == 0);
+    bq->write_index = bq->read_index;
+
+    pa_memblockq_prebuf_force(bq);
 }
 
-uint32_t pa_memblockq_get_minreq(pa_memblockq *bq) {
+size_t pa_memblockq_get_tlength(pa_memblockq *bq) {
     assert(bq);
-    return bq->minreq;
+    
+    return bq->tlength;
 }
 
-void pa_memblockq_prebuf_disable(pa_memblockq *bq) {
+int64_t pa_memblockq_get_read_index(pa_memblockq *bq) {
     assert(bq);
-    bq->prebuf = 0;
+    return bq->read_index;
 }
 
-void pa_memblockq_prebuf_reenable(pa_memblockq *bq) {
+int64_t pa_memblockq_get_write_index(pa_memblockq *bq) {
     assert(bq);
-    bq->prebuf = bq->orig_prebuf;
+    return bq->write_index;
 }
 
-void pa_memblockq_seek(pa_memblockq *bq, size_t length) {
+int pa_memblockq_push_align(pa_memblockq* bq, const pa_memchunk *chunk) {
+    pa_memchunk rchunk;
+
     assert(bq);
+    assert(chunk && bq->base);
+ 	
+    if (bq->base == 1)
+        return pa_memblockq_push(bq, chunk);
+ 	
+    if (!bq->mcalign)
+        bq->mcalign = pa_mcalign_new(bq->base, bq->memblock_stat);
 
-    if (!length)
-        return;
+    if (!can_push(bq, pa_mcalign_csize(bq->mcalign, chunk->length)))
+        return -1;
+    
+    pa_mcalign_push(bq->mcalign, chunk);
+ 	
+    while (pa_mcalign_pop(bq->mcalign, &rchunk) >= 0) {
+        int r;
+        r = pa_memblockq_push(bq, &rchunk);
+        pa_memblock_unref(rchunk.memblock);
 
-    while (length >= bq->base) {
-        size_t l = length;
-        if (!bq->current_length)
-            return;
+        if (r < 0)
+            return -1;
+    }
 
-        assert(bq->blocks_tail);
-        
-        if (l > bq->blocks_tail->chunk.length)
-            l = bq->blocks_tail->chunk.length;
+    return 0;
+}
 
-        bq->blocks_tail->chunk.length -= l;
-        bq->current_length -= l;
-        
-        if (bq->blocks_tail->chunk.length == 0)
-            remove_block(bq, bq->blocks);
+void pa_memblockq_shorten(pa_memblockq *bq, size_t length) {
+    size_t l;
+    assert(bq);
 
-        length -= l;
-    }
+    l = pa_memblockq_get_length(bq);
+
+    if (l > length)
+        pa_memblockq_drop(bq, NULL, l - length);
 }
 
-void pa_memblockq_flush(pa_memblockq *bq) {
-    struct memblock_list *l;
+void pa_memblockq_prebuf_disable(pa_memblockq *bq) {
     assert(bq);
-    
-    while ((l = bq->blocks)) {
-        bq->blocks = l->next;
-        pa_memblock_unref(l->chunk.memblock);
-        pa_xfree(l);
-    }
 
-    bq->blocks_tail = NULL;
-    bq->n_blocks = 0;
-    bq->current_length = 0;
+    if (bq->state == PREBUF)
+        bq->state = RUNNING;
 }
 
-uint32_t pa_memblockq_get_tlength(pa_memblockq *bq) {
+void pa_memblockq_prebuf_force(pa_memblockq *bq) {
     assert(bq);
-    return bq->tlength;
+
+    if (bq->state == RUNNING && bq->prebuf > 0)
+        bq->state = PREBUF;
 }
diff --git a/src/polypcore/memblockq.h b/src/polypcore/memblockq.h
index 7bb25f90..210f1a07 100644
--- a/src/polypcore/memblockq.h
+++ b/src/polypcore/memblockq.h
@@ -23,9 +23,11 @@
 ***/
 
 #include <sys/types.h>
+#include <inttypes.h>
 
 #include <polypcore/memblock.h>
 #include <polypcore/memchunk.h>
+#include <polyp/def.h>
 
 /* A memblockq is a queue of pa_memchunks (yepp, the name is not
  * perfect). It is similar to the ring buffers used by most other
@@ -35,42 +37,59 @@
 
 typedef struct pa_memblockq pa_memblockq;
 
+
 /* Parameters:
-   - maxlength: maximum length of queue. If more data is pushed into the queue, data from the front is dropped
-   - length:    the target length of the queue.
-   - base:      a base value for all metrics. Only multiples of this value are popped from the queue
-   - prebuf:    before passing the first byte out, make sure that enough bytes are in the queue
-   - minreq:    pa_memblockq_missing() will only return values greater than this value
+   
+   - idx:       start value for both read and write index
+
+   - maxlength: maximum length of queue. If more data is pushed into
+                the queue, the operation will fail. Must not be 0.
+   
+   - tlength:   the target length of the queue. Pass 0 for the default.
+   
+   - base:      a base value for all metrics. Only multiples of this value
+                are popped from the queue or should be pushed into
+                it. Must not be 0.
+   
+   - prebuf:    If the queue runs empty wait until this many bytes are in
+                queue again before passing the first byte out. If set
+                to 0 pa_memblockq_pop() will return a silence memblock
+                if no data is in the queue and will never fail. Pass
+                (size_t) -1 for the default.
+                
+   - minreq:    pa_memblockq_missing() will only return values greater
+                than this value. Pass 0 for the default.
+   
+   - silence:   return this memblock whzen reading unitialized data
 */
-pa_memblockq* pa_memblockq_new(size_t maxlength,
-                                      size_t tlength,
-                                      size_t base,
-                                      size_t prebuf,
-                                      size_t minreq,
-                                      pa_memblock_stat *s);
+pa_memblockq* pa_memblockq_new(
+        int64_t idx,
+        size_t maxlength,
+        size_t tlength,
+        size_t base,
+        size_t prebuf, 
+        size_t minreq,
+        pa_memblock *silence,
+        pa_memblock_stat *s);
+
 void pa_memblockq_free(pa_memblockq*bq);
 
-/* Push a new memory chunk into the queue. Optionally specify a value for future cancellation. */
-void pa_memblockq_push(pa_memblockq* bq, const pa_memchunk *chunk, size_t delta);
+/* Push a new memory chunk into the queue.  */
+int pa_memblockq_push(pa_memblockq* bq, const pa_memchunk *chunk);
 
-/* Same as pa_memblockq_push(), however chunks are filtered through a mcalign object, and thus aligned to multiples of base */
-void pa_memblockq_push_align(pa_memblockq* bq, const pa_memchunk *chunk, size_t delta);
+/* Push a new memory chunk into the queue, but filter it through a
+ * pa_mcalign object. Don't mix this with pa_memblockq_seek() unless
+ * you know what you do. */
+int pa_memblockq_push_align(pa_memblockq* bq, const pa_memchunk *chunk);
 
 /* Return a copy of the next memory chunk in the queue. It is not removed from the queue */
 int pa_memblockq_peek(pa_memblockq* bq, pa_memchunk *chunk);
 
-/* Drop the specified bytes from the queue, only valid aufter pa_memblockq_peek() */
+/* Drop the specified bytes from the queue, but only if the first
+ * chunk in the queue matches the one passed here. If NULL is passed,
+ * this check isn't done. */
 void pa_memblockq_drop(pa_memblockq *bq, const pa_memchunk *chunk, size_t length);
 
-/* Drop the specified bytes from the queue */
-void pa_memblockq_skip(pa_memblockq *bq, size_t length);
-
-/* Shorten the pa_memblockq to the specified length by dropping data at the end of the queue */
-void pa_memblockq_shorten(pa_memblockq *bq, size_t length);
-
-/* Empty the pa_memblockq */
-void pa_memblockq_empty(pa_memblockq *bq);
-
 /* Test if the pa_memblockq is currently readable, that is, more data than base */
 int pa_memblockq_is_readable(pa_memblockq *bq);
 
@@ -78,27 +97,38 @@ int pa_memblockq_is_readable(pa_memblockq *bq);
 int pa_memblockq_is_writable(pa_memblockq *bq, size_t length);
 
 /* Return the length of the queue in bytes */
-uint32_t pa_memblockq_get_length(pa_memblockq *bq);
+size_t pa_memblockq_get_length(pa_memblockq *bq);
 
 /* Return how many bytes are missing in queue to the specified fill amount */
-uint32_t pa_memblockq_missing(pa_memblockq *bq);
+size_t pa_memblockq_missing(pa_memblockq *bq);
 
 /* Returns the minimal request value */
-uint32_t pa_memblockq_get_minreq(pa_memblockq *bq);
-
-/* Force disabling of pre-buf even when the pre-buffer is not yet filled */
-void pa_memblockq_prebuf_disable(pa_memblockq *bq);
-
-/* Reenable pre-buf to the initial level */
-void pa_memblockq_prebuf_reenable(pa_memblockq *bq);
+size_t pa_memblockq_get_minreq(pa_memblockq *bq);
 
 /* Manipulate the write pointer */
-void pa_memblockq_seek(pa_memblockq *bq, size_t delta);
+void pa_memblockq_seek(pa_memblockq *bq, int64_t offset, pa_seek_mode_t seek);
 
-/* Flush the queue */
+/* Set the queue to silence, set write index to read index */
 void pa_memblockq_flush(pa_memblockq *bq);
 
 /* Get Target length */
 uint32_t pa_memblockq_get_tlength(pa_memblockq *bq);
 
+/* Return the current read index */
+int64_t pa_memblockq_get_read_index(pa_memblockq *bq);
+
+/* Return the current write index */
+int64_t pa_memblockq_get_write_index(pa_memblockq *bq);
+
+/* Shorten the pa_memblockq to the specified length by dropping data
+ * at the read end of the queue. The read index is increased until the
+ * queue has the specified length */
+void pa_memblockq_shorten(pa_memblockq *bq, size_t length);
+
+/* Ignore prebuf for now */
+void pa_memblockq_prebuf_disable(pa_memblockq *bq);
+
+/* Force prebuf */
+void pa_memblockq_prebuf_force(pa_memblockq *bq);
+
 #endif
diff --git a/src/polypcore/native-common.h b/src/polypcore/native-common.h
index ac3ea823..0d17b022 100644
--- a/src/polypcore/native-common.h
+++ b/src/polypcore/native-common.h
@@ -28,22 +28,22 @@
 PA_C_DECL_BEGIN
 
 enum {
+    /* Generic commands */
     PA_COMMAND_ERROR,
     PA_COMMAND_TIMEOUT, /* pseudo command */
     PA_COMMAND_REPLY,
+
+    /* Commands from client to server */
     PA_COMMAND_CREATE_PLAYBACK_STREAM,
     PA_COMMAND_DELETE_PLAYBACK_STREAM,
     PA_COMMAND_CREATE_RECORD_STREAM,
     PA_COMMAND_DELETE_RECORD_STREAM,
     PA_COMMAND_EXIT,
-    PA_COMMAND_REQUEST,
     PA_COMMAND_AUTH,
     PA_COMMAND_SET_CLIENT_NAME,
     PA_COMMAND_LOOKUP_SINK,
     PA_COMMAND_LOOKUP_SOURCE,
     PA_COMMAND_DRAIN_PLAYBACK_STREAM,
-    PA_COMMAND_PLAYBACK_STREAM_KILLED,
-    PA_COMMAND_RECORD_STREAM_KILLED,
     PA_COMMAND_STAT,
     PA_COMMAND_GET_PLAYBACK_LATENCY,
     PA_COMMAND_CREATE_UPLOAD_STREAM,
@@ -68,7 +68,6 @@ enum {
     PA_COMMAND_GET_SAMPLE_INFO,
     PA_COMMAND_GET_SAMPLE_INFO_LIST,
     PA_COMMAND_SUBSCRIBE,
-    PA_COMMAND_SUBSCRIBE_EVENT,
     
     PA_COMMAND_SET_SINK_VOLUME,
     PA_COMMAND_SET_SINK_INPUT_VOLUME,
@@ -95,6 +94,15 @@ enum {
     PA_COMMAND_CORK_RECORD_STREAM,
     PA_COMMAND_FLUSH_RECORD_STREAM,
     PA_COMMAND_PREBUF_PLAYBACK_STREAM,
+
+    /* Commands from server to client */
+    PA_COMMAND_REQUEST,
+    PA_COMMAND_OVERFLOW,
+    PA_COMMAND_UNDERFLOW,
+    PA_COMMAND_PLAYBACK_STREAM_KILLED,
+    PA_COMMAND_RECORD_STREAM_KILLED,
+    PA_COMMAND_SUBSCRIBE_EVENT,
+
     PA_COMMAND_MAX
 };
 
diff --git a/src/polypcore/packet.c b/src/polypcore/packet.c
index 41803cf9..31ddad95 100644
--- a/src/polypcore/packet.c
+++ b/src/polypcore/packet.c
@@ -32,37 +32,46 @@
 
 pa_packet* pa_packet_new(size_t length) {
     pa_packet *p;
+
     assert(length);
+
     p = pa_xmalloc(sizeof(pa_packet)+length);
     p->ref = 1;
     p->length = length;
     p->data = (uint8_t*) (p+1);
     p->type = PA_PACKET_APPENDED;
+    
     return p;
 }
 
-pa_packet* pa_packet_new_dynamic(uint8_t* data, size_t length) {
+pa_packet* pa_packet_new_dynamic(void* data, size_t length) {
     pa_packet *p;
-    assert(data && length);
-    p = pa_xmalloc(sizeof(pa_packet));
+
+    assert(data);
+    assert(length);
+
+    p = pa_xnew(pa_packet, 1);
     p->ref = 1;
     p->length = length;
     p->data = data;
     p->type = PA_PACKET_DYNAMIC;
+    
     return p;
 }
 
 pa_packet* pa_packet_ref(pa_packet *p) {
-    assert(p && p->ref >= 1);
+    assert(p);
+    assert(p->ref >= 1);
+    
     p->ref++;
     return p;
 }
 
 void pa_packet_unref(pa_packet *p) {
-    assert(p && p->ref >= 1);
-    p->ref--;
-
-    if (p->ref == 0) {
+    assert(p);
+    assert(p->ref >= 1);
+    
+    if (--p->ref == 0) {
         if (p->type == PA_PACKET_DYNAMIC)
             pa_xfree(p->data);
         pa_xfree(p);
diff --git a/src/polypcore/packet.h b/src/polypcore/packet.h
index 0ac47485..fbc58232 100644
--- a/src/polypcore/packet.h
+++ b/src/polypcore/packet.h
@@ -33,7 +33,7 @@ typedef struct pa_packet {
 } pa_packet;
 
 pa_packet* pa_packet_new(size_t length);
-pa_packet* pa_packet_new_dynamic(uint8_t* data, size_t length);
+pa_packet* pa_packet_new_dynamic(void* data, size_t length);
 
 pa_packet* pa_packet_ref(pa_packet *p);
 void pa_packet_unref(pa_packet *p);
diff --git a/src/polypcore/protocol-esound.c b/src/polypcore/protocol-esound.c
index a16ac280..5adff57a 100644
--- a/src/polypcore/protocol-esound.c
+++ b/src/polypcore/protocol-esound.c
@@ -186,6 +186,7 @@ static void connection_free(struct connection *c) {
 
     if (c->sink_input) {
         pa_sink_input_disconnect(c->sink_input);
+        pa_log("disconnect\n");
         pa_sink_input_unref(c->sink_input);
     }
     
@@ -333,7 +334,15 @@ static int esd_proto_stream_play(struct connection *c, PA_GCC_UNUSED esd_proto_t
     }
 
     l = (size_t) (pa_bytes_per_second(&ss)*PLAYBACK_BUFFER_SECONDS); 
-    c->input_memblockq = pa_memblockq_new(l, 0, pa_frame_size(&ss), l/2, l/PLAYBACK_BUFFER_FRAGMENTS, c->protocol->core->memblock_stat);
+    c->input_memblockq = pa_memblockq_new(
+            0,
+            l,
+            0,
+            pa_frame_size(&ss),
+            (size_t) -1,
+            l/PLAYBACK_BUFFER_FRAGMENTS,
+            NULL,
+            c->protocol->core->memblock_stat);
     pa_iochannel_socket_set_rcvbuf(c->io, l/PLAYBACK_BUFFER_FRAGMENTS*2);
     c->playback.fragment_size = l/10;
 
@@ -405,7 +414,15 @@ static int esd_proto_stream_record(struct connection *c, esd_proto_t request, co
     }
 
     l = (size_t) (pa_bytes_per_second(&ss)*RECORD_BUFFER_SECONDS); 
-    c->output_memblockq = pa_memblockq_new(l, 0, pa_frame_size(&ss), 0, 0, c->protocol->core->memblock_stat);
+    c->output_memblockq = pa_memblockq_new(
+            0,
+            l,
+            0,
+            pa_frame_size(&ss),
+            1,
+            0,
+            NULL,
+            c->protocol->core->memblock_stat);
     pa_iochannel_socket_set_sndbuf(c->io, l/RECORD_BUFFER_FRAGMENTS*2);
     
     c->source_output->owner = c->protocol->module;
@@ -724,8 +741,7 @@ static int do_read(struct connection *c) {
         assert(c->read_data_length < sizeof(c->request));
 
         if ((r = pa_iochannel_read(c->io, ((uint8_t*) &c->request) + c->read_data_length, sizeof(c->request) - c->read_data_length)) <= 0) {
-            if (r != 0)
-                pa_log_warn(__FILE__": read() failed: %s\n", strerror(errno));
+            pa_log_debug(__FILE__": read() failed: %s\n", r < 0 ? strerror(errno) : "EOF");
             return -1;
         }
 
@@ -773,8 +789,7 @@ static int do_read(struct connection *c) {
         assert(c->read_data && c->read_data_length < handler->data_length);
 
         if ((r = pa_iochannel_read(c->io, (uint8_t*) c->read_data + c->read_data_length, handler->data_length - c->read_data_length)) <= 0) {
-            if (r != 0)
-                pa_log_warn(__FILE__": read() failed: %s\n", strerror(errno));
+            pa_log_debug(__FILE__": read() failed: %s\n", r < 0 ? strerror(errno) : "EOF");
             return -1;
         }
 
@@ -794,8 +809,7 @@ static int do_read(struct connection *c) {
         assert(c->scache.memchunk.memblock && c->scache.name && c->scache.memchunk.index < c->scache.memchunk.length);
         
         if ((r = pa_iochannel_read(c->io, (uint8_t*) c->scache.memchunk.memblock->data+c->scache.memchunk.index, c->scache.memchunk.length-c->scache.memchunk.index)) <= 0) {
-            if (r!= 0)
-                pa_log_warn(__FILE__": read() failed: %s\n", strerror(errno));
+            pa_log_debug(__FILE__": read() failed: %s\n", r < 0 ? strerror(errno) : "EOF");
             return -1;
         }
 
@@ -852,13 +866,10 @@ static int do_read(struct connection *c) {
         }
 
         if ((r = pa_iochannel_read(c->io, (uint8_t*) c->playback.current_memblock->data+c->playback.memblock_index, l)) <= 0) {
-            if (r != 0)
-                pa_log(__FILE__": read() failed: %s\n", strerror(errno));
+            pa_log_debug(__FILE__": read() failed: %s\n", r < 0 ? strerror(errno) : "EOF");
             return -1;
         }
         
-/*         pa_log(__FILE__": read %u\n", r);  */
-        
         chunk.memblock = c->playback.current_memblock;
         chunk.index = c->playback.memblock_index;
         chunk.length = r;
@@ -867,7 +878,7 @@ static int do_read(struct connection *c) {
         c->playback.memblock_index += r;
         
         assert(c->input_memblockq);
-        pa_memblockq_push_align(c->input_memblockq, &chunk, 0);
+        pa_memblockq_push_align(c->input_memblockq, &chunk);
         assert(c->sink_input);
         pa_sink_notify(c->sink_input->sink);
     }
@@ -910,6 +921,8 @@ static int do_write(struct connection *c) {
 
         pa_memblockq_drop(c->output_memblockq, &chunk, r);
         pa_memblock_unref(chunk.memblock);
+
+        pa_source_notify(c->source_output->source);
     }
     
     return 0;
@@ -921,21 +934,18 @@ static void do_work(struct connection *c) {
     assert(c->protocol && c->protocol->core && c->protocol->core->mainloop && c->protocol->core->mainloop->defer_enable);
     c->protocol->core->mainloop->defer_enable(c->defer_event, 0);
 
-/*     pa_log("DOWORK %i\n", pa_iochannel_is_hungup(c->io));   */
+    if (c->dead)
+        return;
 
-    if (!c->dead && pa_iochannel_is_readable(c->io))
+    if (pa_iochannel_is_readable(c->io)) {
         if (do_read(c) < 0)
             goto fail;
+    } else if (pa_iochannel_is_hungup(c->io))
+        goto fail;
 
-    if (!c->dead && pa_iochannel_is_writable(c->io))
+    if (pa_iochannel_is_writable(c->io))
         if (do_write(c) < 0)
             goto fail;
-
-    /* In case the line was hungup, make sure to rerun this function
-       as soon as possible, until all data has been read. */
-
-    if (!c->dead && pa_iochannel_is_hungup(c->io))
-        c->protocol->core->mainloop->defer_enable(c->defer_event, 1);
     
     return;
 
@@ -943,15 +953,17 @@ fail:
 
     if (c->state == ESD_STREAMING_DATA && c->sink_input) {
         c->dead = 1;
-        pa_memblockq_prebuf_disable(c->input_memblockq);
 
         pa_iochannel_free(c->io);
         c->io = NULL;
-        
+
+        pa_memblockq_prebuf_disable(c->input_memblockq);
+        pa_sink_notify(c->sink_input->sink);
     } else
         connection_free(c);
 }
 
+
 static void io_callback(pa_iochannel*io, void *userdata) {
     struct connection *c = userdata;
     assert(io && c && c->io == io);
@@ -1024,7 +1036,7 @@ static void source_output_push_cb(pa_source_output *o, const pa_memchunk *chunk)
     struct connection *c = o->userdata;
     assert(o && c && chunk);
 
-    pa_memblockq_push(c->output_memblockq, chunk, 0);
+    pa_memblockq_push(c->output_memblockq, chunk);
 
     /* do something */
     assert(c->protocol && c->protocol->core && c->protocol->core->mainloop && c->protocol->core->mainloop->defer_enable);
diff --git a/src/polypcore/protocol-native.c b/src/polypcore/protocol-native.c
index 1362fdf2..aaa4fc48 100644
--- a/src/polypcore/protocol-native.c
+++ b/src/polypcore/protocol-native.c
@@ -48,6 +48,8 @@
 #include <polypcore/authkey-prop.h>
 #include <polypcore/strlist.h>
 #include <polypcore/props.h>
+#include <polypcore/sample-util.h>
+#include <polypcore/llist.h>
 
 #include "protocol-native.h"
 
@@ -77,6 +79,11 @@ struct playback_stream {
     size_t requested_bytes;
     int drain_request;
     uint32_t drain_tag;
+    uint32_t syncid;
+    int underrun;
+
+    /* Sync group members */
+    PA_LLIST_FIELDS(struct playback_stream);
 };
 
 struct upload_stream {
@@ -153,7 +160,8 @@ static void command_get_server_info(pa_pdispatch *pd, uint32_t command, uint32_t
 static void command_subscribe(pa_pdispatch *pd, uint32_t command, uint32_t tag, pa_tagstruct *t, void *userdata);
 static void command_set_volume(pa_pdispatch *pd, uint32_t command, uint32_t tag, pa_tagstruct *t, void *userdata);
 static void command_cork_playback_stream(pa_pdispatch *pd, uint32_t command, uint32_t tag, pa_tagstruct *t, void *userdata);
-static void command_flush_or_trigger_playback_stream(pa_pdispatch *pd, uint32_t command, uint32_t tag, pa_tagstruct *t, void *userdata);
+static void command_flush_playback_stream(pa_pdispatch *pd, uint32_t command, uint32_t tag, pa_tagstruct *t, void *userdata);
+static void command_trigger_or_prebuf_playback_stream(pa_pdispatch *pd, uint32_t command, uint32_t tag, pa_tagstruct *t, void *userdata);
 static void command_set_default_sink_or_source(pa_pdispatch *pd, uint32_t command, uint32_t tag, pa_tagstruct *t, void *userdata);
 static void command_set_stream_name(pa_pdispatch *pd, uint32_t command, uint32_t tag, pa_tagstruct *t, void *userdata);
 static void command_kill(pa_pdispatch *pd, uint32_t command, uint32_t tag, pa_tagstruct *t, void *userdata);
@@ -210,9 +218,9 @@ static const pa_pdispatch_callback command_table[PA_COMMAND_MAX] = {
     [PA_COMMAND_SET_SINK_INPUT_VOLUME] = command_set_volume,
     
     [PA_COMMAND_CORK_PLAYBACK_STREAM] = command_cork_playback_stream,
-    [PA_COMMAND_FLUSH_PLAYBACK_STREAM] = command_flush_or_trigger_playback_stream,
-    [PA_COMMAND_TRIGGER_PLAYBACK_STREAM] = command_flush_or_trigger_playback_stream,
-    [PA_COMMAND_PREBUF_PLAYBACK_STREAM] = command_flush_or_trigger_playback_stream,
+    [PA_COMMAND_FLUSH_PLAYBACK_STREAM] = command_flush_playback_stream,
+    [PA_COMMAND_TRIGGER_PLAYBACK_STREAM] = command_trigger_or_prebuf_playback_stream,
+    [PA_COMMAND_PREBUF_PLAYBACK_STREAM] = command_trigger_or_prebuf_playback_stream,
     
     [PA_COMMAND_CORK_RECORD_STREAM] = command_cork_record_stream,
     [PA_COMMAND_FLUSH_RECORD_STREAM] = command_flush_record_stream,
@@ -244,7 +252,7 @@ static struct upload_stream* upload_stream_new(
     struct upload_stream *s;
     assert(c && ss && name && length);
     
-    s = pa_xmalloc(sizeof(struct upload_stream));
+    s = pa_xnew(struct upload_stream, 1);
     s->type = UPLOAD_STREAM;
     s->connection = c;
     s->sample_spec = *ss;
@@ -291,7 +299,7 @@ static struct record_stream* record_stream_new(
     if (!(source_output = pa_source_output_new(source, __FILE__, name, ss, map, -1)))
         return NULL;
 
-    s = pa_xmalloc(sizeof(struct record_stream));
+    s = pa_xnew(struct record_stream, 1);
     s->connection = c;
     s->source_output = source_output;
     s->source_output->push = source_output_push_cb;
@@ -301,7 +309,15 @@ static struct record_stream* record_stream_new(
     s->source_output->owner = c->protocol->module;
     s->source_output->client = c->client;
 
-    s->memblockq = pa_memblockq_new(maxlength, 0, base = pa_frame_size(ss), 0, 0, c->protocol->core->memblock_stat);
+    s->memblockq = pa_memblockq_new(
+            0,
+            maxlength,
+            0,
+            base = pa_frame_size(ss),
+            1,
+            0,
+            NULL,
+            c->protocol->core->memblock_stat);
     assert(s->memblockq);
 
     s->fragment_size = (fragment_size/base)*base;
@@ -332,19 +348,40 @@ static struct playback_stream* playback_stream_new(
     size_t tlength,
     size_t prebuf,
     size_t minreq,
-    pa_cvolume *volume) {
+    pa_cvolume *volume,
+    uint32_t syncid) {
     
-    struct playback_stream *s;
+    struct playback_stream *s, *sync;
     pa_sink_input *sink_input;
+    pa_memblock *silence;
+    uint32_t idx;
+    int64_t start_index;
+    
     assert(c && sink && ss && name && maxlength);
 
+    /* Find syncid group */
+    for (sync = pa_idxset_first(c->output_streams, &idx); sync; sync = pa_idxset_next(c->output_streams, &idx)) {
+        
+        if (sync->type != PLAYBACK_STREAM)
+            continue;
+
+        if (sync->syncid == syncid)
+            break;
+    }
+
+    /* Synced streams must connect to the same sink */
+    if (sync && sync->sink_input->sink != sink)
+        return NULL;
+    
     if (!(sink_input = pa_sink_input_new(sink, __FILE__, name, ss, map, 0, -1)))
         return NULL;
     
-    s = pa_xmalloc(sizeof(struct playback_stream));
+    s = pa_xnew(struct playback_stream, 1);
     s->type = PLAYBACK_STREAM;
     s->connection = c;
+    s->syncid = syncid;
     s->sink_input = sink_input;
+    s->underrun = 1;
     
     s->sink_input->peek = sink_input_peek_cb;
     s->sink_input->drop = sink_input_drop_cb;
@@ -353,24 +390,56 @@ static struct playback_stream* playback_stream_new(
     s->sink_input->userdata = s;
     s->sink_input->owner = c->protocol->module;
     s->sink_input->client = c->client;
-    
-    s->memblockq = pa_memblockq_new(maxlength, tlength, pa_frame_size(ss), prebuf, minreq, c->protocol->core->memblock_stat);
-    assert(s->memblockq);
 
+    if (sync) {
+        /* Sync id found, now find head of list */
+        PA_LLIST_FIND_HEAD(struct playback_stream, sync, &sync);
+
+        /* Prepend ourselves */
+        PA_LLIST_PREPEND(struct playback_stream, sync, s);
+
+        /* Set our start index to the current read index of the other grozp member(s) */
+        assert(sync->next);
+        start_index = pa_memblockq_get_read_index(sync->next->memblockq);
+    } else {
+        /* This ia a new sync group */
+        PA_LLIST_INIT(struct playback_stream, s);
+        start_index = 0;
+    }
+    
+    silence = pa_silence_memblock_new(ss, 0, c->protocol->core->memblock_stat);
+    
+    s->memblockq = pa_memblockq_new(
+            start_index,
+            maxlength,
+            tlength,
+            pa_frame_size(ss),
+            prebuf,
+            minreq,
+            silence,
+            c->protocol->core->memblock_stat);
+
+    pa_memblock_unref(silence);
+    
     s->requested_bytes = 0;
     s->drain_request = 0;
 
     s->sink_input->volume = *volume;
     
     pa_idxset_put(c->output_streams, s, &s->index);
+
     return s;
 }
 
 static void playback_stream_free(struct playback_stream* p) {
+    struct playback_stream *head;
     assert(p && p->connection);
 
     if (p->drain_request)
-        pa_pstream_send_error(p->connection->pstream, p->drain_tag, PA_ERROR_NOENTITY);
+        pa_pstream_send_error(p->connection->pstream, p->drain_tag, PA_ERR_NOENTITY);
+
+    PA_LLIST_FIND_HEAD(struct playback_stream, p, &head);
+    PA_LLIST_REMOVE(struct playback_stream, head, p);
 
     pa_idxset_remove_by_data(p->connection->output_streams, p, NULL);
     pa_sink_input_disconnect(p->sink_input);
@@ -436,7 +505,7 @@ static void request_bytes(struct playback_stream *s) {
     pa_tagstruct_putu32(t, l);
     pa_pstream_send_tagstruct(s->connection->pstream, t);
 
-/*     pa_log(__FILE__": Requesting %u bytes\n", l); */
+/*     pa_log(__FILE__": Requesting %u bytes\n", l);  */
 }
 
 static void send_memblock(struct connection *c) {
@@ -461,7 +530,7 @@ static void send_memblock(struct connection *c) {
             if (schunk.length > r->fragment_size)
                 schunk.length = r->fragment_size;
 
-            pa_pstream_send_memblock(c->pstream, r->index, 0, &schunk);
+            pa_pstream_send_memblock(c->pstream, r->index, 0, PA_SEEK_RELATIVE, &schunk);
             pa_memblockq_drop(r->memblockq, &chunk, schunk.length);
             pa_memblock_unref(schunk.memblock);
             
@@ -501,9 +570,27 @@ static int sink_input_peek_cb(pa_sink_input *i, pa_memchunk *chunk) {
     assert(i && i->userdata && chunk);
     s = i->userdata;
 
-    if (pa_memblockq_peek(s->memblockq, chunk) < 0)
+    if (pa_memblockq_get_length(s->memblockq) <= 0 && !s->underrun) {
+        pa_tagstruct *t;
+
+        /* Report that we're empty */
+
+        t = pa_tagstruct_new(NULL, 0);
+        pa_tagstruct_putu32(t, PA_COMMAND_UNDERFLOW);
+        pa_tagstruct_putu32(t, (uint32_t) -1); /* tag */
+        pa_tagstruct_putu32(t, s->index);
+        pa_pstream_send_tagstruct(s->connection->pstream, t);
+
+        s->underrun = 1;
+    }
+    
+    if (pa_memblockq_peek(s->memblockq, chunk) < 0) {
+        pa_log(__FILE__": peek: failure\n");   
         return -1;
+    }
 
+/*     pa_log(__FILE__": peek: %u\n", chunk->length);    */
+    
     return 0;
 }
 
@@ -513,6 +600,7 @@ static void sink_input_drop_cb(pa_sink_input *i, const pa_memchunk *chunk, size_
     s = i->userdata;
 
     pa_memblockq_drop(s->memblockq, chunk, length);
+
     request_bytes(s);
 
     if (s->drain_request && !pa_memblockq_is_readable(s->memblockq)) {
@@ -520,7 +608,7 @@ static void sink_input_drop_cb(pa_sink_input *i, const pa_memchunk *chunk, size_
         s->drain_request = 0;
     }
 
-/*     pa_log(__FILE__": after_drop: %u\n", pa_memblockq_get_length(s->memblockq)); */
+/*     pa_log(__FILE__": after_drop: %u %u\n", pa_memblockq_get_length(s->memblockq), pa_memblockq_is_readable(s->memblockq));   */
 }
 
 static void sink_input_kill_cb(pa_sink_input *i) {
@@ -546,7 +634,11 @@ static void source_output_push_cb(pa_source_output *o, const pa_memchunk *chunk)
     assert(o && o->userdata && chunk);
     s = o->userdata;
     
-    pa_memblockq_push_align(s->memblockq, chunk, 0);
+    if (pa_memblockq_push_align(s->memblockq, chunk) < 0) {
+        pa_log_warn(__FILE__": Failed to push data into output queue.\n");
+        return;
+    } 
+        
     if (!pa_pstream_is_pending(s->connection->pstream))
         send_memblock(s->connection);
 }
@@ -578,7 +670,7 @@ static void command_create_playback_stream(PA_GCC_UNUSED pa_pdispatch *pd, PA_GC
     struct connection *c = userdata;
     struct playback_stream *s;
     size_t maxlength, tlength, prebuf, minreq;
-    uint32_t sink_index;
+    uint32_t sink_index, syncid;
     const char *name, *sink_name;
     pa_sample_spec ss;
     pa_channel_map map;
@@ -601,6 +693,7 @@ static void command_create_playback_stream(PA_GCC_UNUSED pa_pdispatch *pd, PA_GC
             PA_TAG_U32, &tlength,
             PA_TAG_U32, &prebuf,
             PA_TAG_U32, &minreq,
+            PA_TAG_U32, &syncid,
             PA_TAG_CVOLUME, &volume,
             PA_TAG_INVALID) < 0 ||
         !pa_tagstruct_eof(t) ||
@@ -610,23 +703,23 @@ static void command_create_playback_stream(PA_GCC_UNUSED pa_pdispatch *pd, PA_GC
     }
 
     if (!c->authorized) {
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_ACCESS);
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_ACCESS);
         return;
     }
 
-    if (sink_index != (uint32_t) -1)
+    if (sink_index != PA_INVALID_INDEX)
         sink = pa_idxset_get_by_index(c->protocol->core->sinks, sink_index);
     else
         sink = pa_namereg_get(c->protocol->core, sink_name, PA_NAMEREG_SINK, 1);
 
     if (!sink) {
-        pa_log("%s: Can't find a suitable sink.\n", __FILE__);
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_NOENTITY);
+        pa_log_warn(__FILE__": Can't find a suitable sink.\n");
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_NOENTITY);
         return;
     }
     
-    if (!(s = playback_stream_new(c, sink, &ss, &map, name, maxlength, tlength, prebuf, minreq, &volume))) {
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_INVALID);
+    if (!(s = playback_stream_new(c, sink, &ss, &map, name, maxlength, tlength, prebuf, minreq, &volume, syncid))) {
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_INVALID);
         return;
     }
 
@@ -656,14 +749,14 @@ static void command_delete_stream(PA_GCC_UNUSED pa_pdispatch *pd, uint32_t comma
     }
 
     if (!c->authorized) {
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_ACCESS);
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_ACCESS);
         return;
     }
 
     if (command == PA_COMMAND_DELETE_PLAYBACK_STREAM) {
         struct playback_stream *s;
         if (!(s = pa_idxset_get_by_index(c->output_streams, channel)) || (s->type != PLAYBACK_STREAM)) {
-            pa_pstream_send_error(c->pstream, tag, PA_ERROR_EXIST);
+            pa_pstream_send_error(c->pstream, tag, PA_ERR_EXIST);
             return;
         }
 
@@ -671,7 +764,7 @@ static void command_delete_stream(PA_GCC_UNUSED pa_pdispatch *pd, uint32_t comma
     } else if (command == PA_COMMAND_DELETE_RECORD_STREAM) {
         struct record_stream *s;
         if (!(s = pa_idxset_get_by_index(c->record_streams, channel))) {
-            pa_pstream_send_error(c->pstream, tag, PA_ERROR_EXIST);
+            pa_pstream_send_error(c->pstream, tag, PA_ERR_EXIST);
             return;
         }
 
@@ -680,7 +773,7 @@ static void command_delete_stream(PA_GCC_UNUSED pa_pdispatch *pd, uint32_t comma
         struct upload_stream *s;
         assert(command == PA_COMMAND_DELETE_UPLOAD_STREAM);
         if (!(s = pa_idxset_get_by_index(c->output_streams, channel)) || (s->type != UPLOAD_STREAM)) {
-            pa_pstream_send_error(c->pstream, tag, PA_ERROR_EXIST);
+            pa_pstream_send_error(c->pstream, tag, PA_ERR_EXIST);
             return;
         }
 
@@ -717,7 +810,7 @@ static void command_create_record_stream(PA_GCC_UNUSED pa_pdispatch *pd, PA_GCC_
     }
 
     if (!c->authorized) {
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_ACCESS);
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_ACCESS);
         return;
     }
 
@@ -727,12 +820,12 @@ static void command_create_record_stream(PA_GCC_UNUSED pa_pdispatch *pd, PA_GCC_
         source = pa_namereg_get(c->protocol->core, source_name, PA_NAMEREG_SOURCE, 1);
 
     if (!source) {
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_NOENTITY);
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_NOENTITY);
         return;
     }
     
     if (!(s = record_stream_new(c, source, &ss, &map, name, maxlength, fragment_size))) {
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_INVALID);
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_INVALID);
         return;
     }
 
@@ -758,7 +851,7 @@ static void command_exit(PA_GCC_UNUSED pa_pdispatch *pd, PA_GCC_UNUSED uint32_t
     }
 
     if (!c->authorized) {
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_ACCESS);
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_ACCESS);
         return;
     }
     
@@ -782,7 +875,7 @@ static void command_auth(PA_GCC_UNUSED pa_pdispatch *pd, PA_GCC_UNUSED uint32_t
     if (!c->authorized) {
         if (memcmp(c->protocol->auth_cookie, cookie, PA_NATIVE_COOKIE_LENGTH) != 0) {
             pa_log(__FILE__": Denied access to client with invalid authorization key.\n");
-            pa_pstream_send_error(c->pstream, tag, PA_ERROR_ACCESS);
+            pa_pstream_send_error(c->pstream, tag, PA_ERR_ACCESS);
             return;
         }
         
@@ -826,7 +919,7 @@ static void command_lookup(PA_GCC_UNUSED pa_pdispatch *pd, uint32_t command, uin
     }
 
     if (!c->authorized) {
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_ACCESS);
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_ACCESS);
         return;
     }
 
@@ -842,7 +935,7 @@ static void command_lookup(PA_GCC_UNUSED pa_pdispatch *pd, uint32_t command, uin
     }
 
     if (idx == PA_IDXSET_INVALID)
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_NOENTITY);
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_NOENTITY);
     else {
         pa_tagstruct *reply;
         reply = pa_tagstruct_new(NULL, 0);
@@ -867,12 +960,12 @@ static void command_drain_playback_stream(PA_GCC_UNUSED pa_pdispatch *pd, PA_GCC
     }
 
     if (!c->authorized) {
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_ACCESS);
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_ACCESS);
         return;
     }
 
     if (!(s = pa_idxset_get_by_index(c->output_streams, idx)) || s->type != PLAYBACK_STREAM) {
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_NOENTITY);
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_NOENTITY);
         return;
     }
 
@@ -881,10 +974,10 @@ static void command_drain_playback_stream(PA_GCC_UNUSED pa_pdispatch *pd, PA_GCC
     pa_memblockq_prebuf_disable(s->memblockq);
     
     if (!pa_memblockq_is_readable(s->memblockq)) {
-/*         pa_log("immediate drain: %u\n", pa_memblockq_get_length(s->memblockq)); */
+/*         pa_log("immediate drain: %u\n", pa_memblockq_get_length(s->memblockq));  */
         pa_pstream_send_simple_ack(c->pstream, tag);
     } else {
-/*         pa_log("slow drain triggered\n"); */
+/*         pa_log("slow drain triggered\n");  */
         s->drain_request = 1;
         s->drain_tag = tag;
 
@@ -903,7 +996,7 @@ static void command_stat(PA_GCC_UNUSED pa_pdispatch *pd, PA_GCC_UNUSED uint32_t
     }
 
     if (!c->authorized) {
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_ACCESS);
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_ACCESS);
         return;
     }
 
@@ -937,12 +1030,12 @@ static void command_get_playback_latency(PA_GCC_UNUSED pa_pdispatch *pd, PA_GCC_
     }
 
     if (!c->authorized) {
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_ACCESS);
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_ACCESS);
         return;
     }
 
     if (!(s = pa_idxset_get_by_index(c->output_streams, idx)) || s->type != PLAYBACK_STREAM) {
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_NOENTITY);
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_NOENTITY);
         return;
     }
 
@@ -980,12 +1073,12 @@ static void command_get_record_latency(PA_GCC_UNUSED pa_pdispatch *pd, PA_GCC_UN
     }
 
     if (!c->authorized) {
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_ACCESS);
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_ACCESS);
         return;
     }
 
     if (!(s = pa_idxset_get_by_index(c->record_streams, idx))) {
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_NOENTITY);
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_NOENTITY);
         return;
     }
 
@@ -1026,17 +1119,17 @@ static void command_create_upload_stream(PA_GCC_UNUSED pa_pdispatch *pd, PA_GCC_
     }
 
     if (!c->authorized) {
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_ACCESS);
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_ACCESS);
         return;
     }
 
     if ((length % pa_frame_size(&ss)) != 0 || length <= 0 || !*name) {
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_INVALID);
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_INVALID);
         return;
     }
     
     if (!(s = upload_stream_new(c, &ss, &map, name, length))) {
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_INVALID);
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_INVALID);
         return;
     }
     
@@ -1063,12 +1156,12 @@ static void command_finish_upload_stream(PA_GCC_UNUSED pa_pdispatch *pd, PA_GCC_
     }
 
     if (!c->authorized) {
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_ACCESS);
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_ACCESS);
         return;
     }
 
     if (!(s = pa_idxset_get_by_index(c->output_streams, channel)) || (s->type != UPLOAD_STREAM)) {
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_EXIST);
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_EXIST);
         return;
     }
 
@@ -1095,7 +1188,7 @@ static void command_play_sample(PA_GCC_UNUSED pa_pdispatch *pd, PA_GCC_UNUSED ui
     }
     
     if (!c->authorized) {
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_ACCESS);
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_ACCESS);
         return;
     }
 
@@ -1105,12 +1198,12 @@ static void command_play_sample(PA_GCC_UNUSED pa_pdispatch *pd, PA_GCC_UNUSED ui
         sink = pa_namereg_get(c->protocol->core, sink_name, PA_NAMEREG_SINK, 1);
 
     if (!sink) {
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_NOENTITY);
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_NOENTITY);
         return;
     }
 
     if (pa_scache_play_item(c->protocol->core, name, sink, &volume) < 0) {
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_NOENTITY);
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_NOENTITY);
         return;
     }
 
@@ -1129,12 +1222,12 @@ static void command_remove_sample(PA_GCC_UNUSED pa_pdispatch *pd, PA_GCC_UNUSED
     }
 
     if (!c->authorized) {
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_ACCESS);
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_ACCESS);
         return;
     }
 
     if (pa_scache_remove_item(c->protocol->core, name) < 0) {
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_NOENTITY);
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_NOENTITY);
         return;
     }
 
@@ -1261,7 +1354,7 @@ static void command_get_info(PA_GCC_UNUSED pa_pdispatch *pd, uint32_t command, u
     }
     
     if (!c->authorized) {
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_ACCESS);
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_ACCESS);
         return;
     }
 
@@ -1292,7 +1385,7 @@ static void command_get_info(PA_GCC_UNUSED pa_pdispatch *pd, uint32_t command, u
     }
             
     if (!sink && !source && !client && !module && !si && !so && !sce) {
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_NOENTITY);
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_NOENTITY);
         return;
     }
 
@@ -1331,7 +1424,7 @@ static void command_get_info_list(PA_GCC_UNUSED pa_pdispatch *pd, uint32_t comma
     }
     
     if (!c->authorized) {
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_ACCESS);
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_ACCESS);
         return;
     }
 
@@ -1394,7 +1487,7 @@ static void command_get_server_info(PA_GCC_UNUSED pa_pdispatch *pd, PA_GCC_UNUSE
     }
     
     if (!c->authorized) {
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_ACCESS);
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_ACCESS);
         return;
     }
 
@@ -1444,7 +1537,7 @@ static void command_subscribe(PA_GCC_UNUSED pa_pdispatch *pd, PA_GCC_UNUSED uint
     }
     
     if (!c->authorized) {
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_ACCESS);
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_ACCESS);
         return;
     }
 
@@ -1478,7 +1571,7 @@ static void command_set_volume(PA_GCC_UNUSED pa_pdispatch *pd, uint32_t command,
     }
     
     if (!c->authorized) {
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_ACCESS);
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_ACCESS);
         return;
     }
 
@@ -1493,7 +1586,7 @@ static void command_set_volume(PA_GCC_UNUSED pa_pdispatch *pd, uint32_t command,
     }
 
     if (!si && !sink) {
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_NOENTITY);
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_NOENTITY);
         return;
     }
 
@@ -1509,7 +1602,7 @@ static void command_cork_playback_stream(PA_GCC_UNUSED pa_pdispatch *pd, PA_GCC_
     struct connection *c = userdata;
     uint32_t idx;
     int b;
-    struct playback_stream *s;
+    struct playback_stream *s, *sync;
     assert(c && t);
 
     if (pa_tagstruct_getu32(t, &idx) < 0 ||
@@ -1520,20 +1613,82 @@ static void command_cork_playback_stream(PA_GCC_UNUSED pa_pdispatch *pd, PA_GCC_
     }
 
     if (!c->authorized) {
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_ACCESS);
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_ACCESS);
         return;
     }
 
     if (!(s = pa_idxset_get_by_index(c->output_streams, idx)) || s->type != PLAYBACK_STREAM) {
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_NOENTITY);
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_NOENTITY);
         return;
     }
 
+    fprintf(stderr, "Corking %i\n", b);
+
     pa_sink_input_cork(s->sink_input, b);
+    pa_memblockq_prebuf_force(s->memblockq);
+
+    /* Do the same for all other members in the sync group */
+    for (sync = s->prev; sync; sync = sync->prev) {
+        pa_sink_input_cork(sync->sink_input, b);
+        pa_memblockq_prebuf_force(sync->memblockq);
+    }
+
+    for (sync = s->next; sync; sync = sync->next) {
+        pa_sink_input_cork(sync->sink_input, b);
+        pa_memblockq_prebuf_force(sync->memblockq);
+    }
+    
+    pa_pstream_send_simple_ack(c->pstream, tag);
+} 
+
+static void command_flush_playback_stream(PA_GCC_UNUSED pa_pdispatch *pd, PA_GCC_UNUSED uint32_t command, uint32_t tag, pa_tagstruct *t, void *userdata) {
+    struct connection *c = userdata;
+    uint32_t idx;
+    struct playback_stream *s, *sync;
+    assert(c && t);
+
+    if (pa_tagstruct_getu32(t, &idx) < 0 ||
+        !pa_tagstruct_eof(t)) {
+        protocol_error(c);
+        return;
+    }
+
+    if (!c->authorized) {
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_ACCESS);
+        return;
+    }
+
+    if (!(s = pa_idxset_get_by_index(c->output_streams, idx)) || s->type != PLAYBACK_STREAM) {
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_NOENTITY);
+        return;
+    }
+
+    pa_memblockq_flush(s->memblockq);
+    s->underrun = 0;
+    
+    /* Do the same for all other members in the sync group */
+    for (sync = s->prev; sync; sync = sync->prev) {
+        pa_memblockq_flush(sync->memblockq);
+        sync->underrun = 0;
+    }
+
+    for (sync = s->next; sync; sync = sync->next) {
+        pa_memblockq_flush(sync->memblockq);
+        sync->underrun = 0;
+    }
+    
     pa_pstream_send_simple_ack(c->pstream, tag);
+    pa_sink_notify(s->sink_input->sink);
+    request_bytes(s);
+    
+    for (sync = s->prev; sync; sync = sync->prev)
+        request_bytes(sync);
+
+    for (sync = s->next; sync; sync = sync->next)
+        request_bytes(sync);
 }
 
-static void command_flush_or_trigger_playback_stream(PA_GCC_UNUSED pa_pdispatch *pd, PA_GCC_UNUSED uint32_t command, uint32_t tag, pa_tagstruct *t, void *userdata) {
+static void command_trigger_or_prebuf_playback_stream(PA_GCC_UNUSED pa_pdispatch *pd, PA_GCC_UNUSED uint32_t command, uint32_t tag, pa_tagstruct *t, void *userdata) {
     struct connection *c = userdata;
     uint32_t idx;
     struct playback_stream *s;
@@ -1546,23 +1701,26 @@ static void command_flush_or_trigger_playback_stream(PA_GCC_UNUSED pa_pdispatch
     }
 
     if (!c->authorized) {
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_ACCESS);
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_ACCESS);
         return;
     }
 
     if (!(s = pa_idxset_get_by_index(c->output_streams, idx)) || s->type != PLAYBACK_STREAM) {
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_NOENTITY);
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_NOENTITY);
         return;
     }
 
-    if (command == PA_COMMAND_PREBUF_PLAYBACK_STREAM)
-        pa_memblockq_prebuf_reenable(s->memblockq);
-    else if (command == PA_COMMAND_TRIGGER_PLAYBACK_STREAM)
-        pa_memblockq_prebuf_disable(s->memblockq);
-    else {
-        assert(command == PA_COMMAND_FLUSH_PLAYBACK_STREAM);
-        pa_memblockq_flush(s->memblockq);
-        /*pa_log(__FILE__": flush: %u\n", pa_memblockq_get_length(s->memblockq));*/
+    switch (command) {
+        case PA_COMMAND_PREBUF_PLAYBACK_STREAM:
+            pa_memblockq_prebuf_force(s->memblockq);
+            break;
+            
+        case PA_COMMAND_TRIGGER_PLAYBACK_STREAM:
+            pa_memblockq_prebuf_disable(s->memblockq);
+            break;
+            
+        default:
+            abort();
     }
 
     pa_sink_notify(s->sink_input->sink);
@@ -1585,16 +1743,17 @@ static void command_cork_record_stream(PA_GCC_UNUSED pa_pdispatch *pd, PA_GCC_UN
     }
 
     if (!c->authorized) {
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_ACCESS);
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_ACCESS);
         return;
     }
 
     if (!(s = pa_idxset_get_by_index(c->record_streams, idx))) {
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_NOENTITY);
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_NOENTITY);
         return;
     }
 
     pa_source_output_cork(s->source_output, b);
+    pa_memblockq_prebuf_force(s->memblockq);
     pa_pstream_send_simple_ack(c->pstream, tag);
 }
 
@@ -1611,12 +1770,12 @@ static void command_flush_record_stream(PA_GCC_UNUSED pa_pdispatch *pd, PA_GCC_U
     }
 
     if (!c->authorized) {
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_ACCESS);
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_ACCESS);
         return;
     }
 
     if (!(s = pa_idxset_get_by_index(c->record_streams, idx))) {
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_NOENTITY);
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_NOENTITY);
         return;
     }
 
@@ -1638,7 +1797,7 @@ static void command_set_default_sink_or_source(PA_GCC_UNUSED pa_pdispatch *pd, u
     }
 
     if (!c->authorized) {
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_ACCESS);
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_ACCESS);
         return;
     }
 
@@ -1660,7 +1819,7 @@ static void command_set_stream_name(PA_GCC_UNUSED pa_pdispatch *pd, uint32_t com
     }
     
     if (!c->authorized) {
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_ACCESS);
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_ACCESS);
         return;
     }
 
@@ -1668,7 +1827,7 @@ static void command_set_stream_name(PA_GCC_UNUSED pa_pdispatch *pd, uint32_t com
         struct playback_stream *s;
         
         if (!(s = pa_idxset_get_by_index(c->output_streams, idx)) || s->type != PLAYBACK_STREAM) {
-            pa_pstream_send_error(c->pstream, tag, PA_ERROR_NOENTITY);
+            pa_pstream_send_error(c->pstream, tag, PA_ERR_NOENTITY);
             return;
         }
 
@@ -1678,7 +1837,7 @@ static void command_set_stream_name(PA_GCC_UNUSED pa_pdispatch *pd, uint32_t com
         struct record_stream *s;
         
         if (!(s = pa_idxset_get_by_index(c->record_streams, idx))) {
-            pa_pstream_send_error(c->pstream, tag, PA_ERROR_NOENTITY);
+            pa_pstream_send_error(c->pstream, tag, PA_ERR_NOENTITY);
             return;
         }
 
@@ -1700,7 +1859,7 @@ static void command_kill(PA_GCC_UNUSED pa_pdispatch *pd, uint32_t command, uint3
     }
     
     if (!c->authorized) {
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_ACCESS);
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_ACCESS);
         return;
     }
 
@@ -1708,7 +1867,7 @@ static void command_kill(PA_GCC_UNUSED pa_pdispatch *pd, uint32_t command, uint3
         pa_client *client;
         
         if (!(client = pa_idxset_get_by_index(c->protocol->core->clients, idx))) {
-            pa_pstream_send_error(c->pstream, tag, PA_ERROR_NOENTITY);
+            pa_pstream_send_error(c->pstream, tag, PA_ERR_NOENTITY);
             return;
         }
 
@@ -1717,7 +1876,7 @@ static void command_kill(PA_GCC_UNUSED pa_pdispatch *pd, uint32_t command, uint3
         pa_sink_input *s;
         
         if (!(s = pa_idxset_get_by_index(c->protocol->core->sink_inputs, idx))) {
-            pa_pstream_send_error(c->pstream, tag, PA_ERROR_NOENTITY);
+            pa_pstream_send_error(c->pstream, tag, PA_ERR_NOENTITY);
             return;
         }
 
@@ -1728,7 +1887,7 @@ static void command_kill(PA_GCC_UNUSED pa_pdispatch *pd, uint32_t command, uint3
         assert(command == PA_COMMAND_KILL_SOURCE_OUTPUT);
         
         if (!(s = pa_idxset_get_by_index(c->protocol->core->source_outputs, idx))) {
-            pa_pstream_send_error(c->pstream, tag, PA_ERROR_NOENTITY);
+            pa_pstream_send_error(c->pstream, tag, PA_ERR_NOENTITY);
             return;
         }
 
@@ -1753,12 +1912,12 @@ static void command_load_module(PA_GCC_UNUSED pa_pdispatch *pd, PA_GCC_UNUSED ui
     }
     
     if (!c->authorized) {
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_ACCESS);
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_ACCESS);
         return;
     }
 
     if (!(m = pa_module_load(c->protocol->core, name, argument))) {
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_INITFAILED);
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_MODINITFAILED);
         return;
     }
 
@@ -1782,12 +1941,12 @@ static void command_unload_module(PA_GCC_UNUSED pa_pdispatch *pd, PA_GCC_UNUSED
     }
     
     if (!c->authorized) {
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_ACCESS);
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_ACCESS);
         return;
     }
 
     if (!(m = pa_idxset_get_by_index(c->protocol->core->modules, idx))) {
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_NOENTITY);
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_NOENTITY);
         return;
     }
 
@@ -1813,12 +1972,12 @@ static void command_add_autoload(PA_GCC_UNUSED pa_pdispatch *pd, PA_GCC_UNUSED u
     }
     
     if (!c->authorized) {
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_ACCESS);
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_ACCESS);
         return;
     }
 
     if (pa_autoload_add(c->protocol->core, name, type == 0 ? PA_NAMEREG_SINK : PA_NAMEREG_SOURCE, module, argument, &idx) < 0) {
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_EXIST);
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_EXIST);
         return;
     }
 
@@ -1847,7 +2006,7 @@ static void command_remove_autoload(PA_GCC_UNUSED pa_pdispatch *pd, PA_GCC_UNUSE
     }
     
     if (!c->authorized) {
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_ACCESS);
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_ACCESS);
         return;
     }
 
@@ -1857,7 +2016,7 @@ static void command_remove_autoload(PA_GCC_UNUSED pa_pdispatch *pd, PA_GCC_UNUSE
         r = pa_autoload_remove_by_index(c->protocol->core, idx);
 
     if (r < 0) {
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_NOENTITY);
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_NOENTITY);
         return;
     }
 
@@ -1893,7 +2052,7 @@ static void command_get_autoload_info(PA_GCC_UNUSED pa_pdispatch *pd, PA_GCC_UNU
     }
 
     if (!c->authorized) {
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_ACCESS);
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_ACCESS);
         return;
     }
 
@@ -1904,7 +2063,7 @@ static void command_get_autoload_info(PA_GCC_UNUSED pa_pdispatch *pd, PA_GCC_UNU
         a = pa_autoload_get_by_index(c->protocol->core, idx);
 
     if (!a) {
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_NOENTITY);
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_NOENTITY);
         return;
     }
 
@@ -1927,7 +2086,7 @@ static void command_get_autoload_info_list(PA_GCC_UNUSED pa_pdispatch *pd, PA_GC
     }
     
     if (!c->authorized) {
-        pa_pstream_send_error(c->pstream, tag, PA_ERROR_ACCESS);
+        pa_pstream_send_error(c->pstream, tag, PA_ERR_ACCESS);
         return;
     }
 
@@ -1958,7 +2117,7 @@ static void pstream_packet_callback(pa_pstream *p, pa_packet *packet, void *user
     }
 }
 
-static void pstream_memblock_callback(pa_pstream *p, uint32_t channel, uint32_t delta, const pa_memchunk *chunk, void *userdata) {
+static void pstream_memblock_callback(pa_pstream *p, uint32_t channel, int64_t offset, pa_seek_mode_t seek, const pa_memchunk *chunk, void *userdata) {
     struct connection *c = userdata;
     struct output_stream *stream;
     assert(p && chunk && userdata);
@@ -1975,13 +2134,30 @@ static void pstream_memblock_callback(pa_pstream *p, uint32_t channel, uint32_t
             ps->requested_bytes = 0;
         else
             ps->requested_bytes -= chunk->length;
-        
-        pa_memblockq_push_align(ps->memblockq, chunk, delta);
-        assert(ps->sink_input);
-/*         pa_log(__FILE__": after_recv: %u\n", pa_memblockq_get_length(p->memblockq)); */
 
+        pa_memblockq_seek(ps->memblockq, offset, seek);
+
+        if (pa_memblockq_push_align(ps->memblockq, chunk) < 0) {
+            pa_tagstruct *t;
+            
+            pa_log_warn(__FILE__": failed to push data into queue\n");
+
+            /* Pushing this block into the queue failed, so we simulate
+             * it by skipping ahead */
+            
+            pa_memblockq_seek(ps->memblockq, chunk->length, PA_SEEK_RELATIVE);
+
+            /* Notify the user */
+            t = pa_tagstruct_new(NULL, 0);
+            pa_tagstruct_putu32(t, PA_COMMAND_OVERFLOW);
+            pa_tagstruct_putu32(t, (uint32_t) -1); /* tag */
+            pa_tagstruct_putu32(t, ps->index);
+            pa_pstream_send_tagstruct(p, t);
+        }
+
+        ps->underrun = 0;
+            
         pa_sink_notify(ps->sink_input->sink);
-/*          pa_log(__FILE__": Recieved %u bytes.\n", chunk->length);  */
 
     } else {
         struct upload_stream *u = (struct upload_stream*) stream;
diff --git a/src/polypcore/protocol-simple.c b/src/polypcore/protocol-simple.c
index 4d3f8e1d..fac54239 100644
--- a/src/polypcore/protocol-simple.c
+++ b/src/polypcore/protocol-simple.c
@@ -52,6 +52,8 @@ struct connection {
     pa_memblockq *input_memblockq, *output_memblockq;
     pa_defer_event *defer_event;
 
+    int dead;
+    
     struct {
         pa_memblock *current_memblock;
         size_t memblock_index, fragment_size;
@@ -130,7 +132,7 @@ static int do_read(struct connection *c) {
     }
     
     if ((r = pa_iochannel_read(c->io, (uint8_t*) c->playback.current_memblock->data+c->playback.memblock_index, l)) <= 0) {
-        pa_log(__FILE__": read() failed: %s\n", r == 0 ? "EOF" : strerror(errno));
+        pa_log_debug(__FILE__": read() failed: %s\n", r == 0 ? "EOF" : strerror(errno));
         return -1;
     }
 
@@ -142,7 +144,7 @@ static int do_read(struct connection *c) {
     c->playback.memblock_index += r;
     
     assert(c->input_memblockq);
-    pa_memblockq_push_align(c->input_memblockq, &chunk, 0);
+    pa_memblockq_push_align(c->input_memblockq, &chunk);
     assert(c->sink_input);
     pa_sink_notify(c->sink_input->sink);
     
@@ -170,32 +172,46 @@ static int do_write(struct connection *c) {
     
     pa_memblockq_drop(c->output_memblockq, &chunk, r);
     pa_memblock_unref(chunk.memblock);
+
+    pa_source_notify(c->source_output->source);
     
     return 0;
 }
 
-
 static void do_work(struct connection *c) {
     assert(c);
 
     assert(c->protocol && c->protocol->core && c->protocol->core->mainloop && c->protocol->core->mainloop->defer_enable);
     c->protocol->core->mainloop->defer_enable(c->defer_event, 0);
 
-    if (pa_iochannel_is_writable(c->io))
-        if (do_write(c) < 0)
-            goto fail;
+    if (c->dead)
+        return;
     
-    if (pa_iochannel_is_readable(c->io))
+    if (pa_iochannel_is_readable(c->io)) {
         if (do_read(c) < 0)
             goto fail;
+    } else if (pa_iochannel_is_hungup(c->io))
+        goto fail;
 
-    if (pa_iochannel_is_hungup(c->io))
-        c->protocol->core->mainloop->defer_enable(c->defer_event, 1);
+    if (pa_iochannel_is_writable(c->io)) {
+        if (do_write(c) < 0)
+            goto fail;
+    } 
 
     return;
 
 fail:
-    connection_free(c);
+
+    if (c->sink_input) {
+        c->dead = 1;
+        
+        pa_iochannel_free(c->io);
+        c->io = NULL;
+
+        pa_memblockq_prebuf_disable(c->input_memblockq);
+        pa_sink_notify(c->sink_input->sink);
+    } else
+        connection_free(c);
 }
 
 /*** sink_input callbacks ***/
@@ -205,8 +221,13 @@ static int sink_input_peek_cb(pa_sink_input *i, pa_memchunk *chunk) {
     assert(i && i->userdata && chunk);
     c = i->userdata;
     
-    if (pa_memblockq_peek(c->input_memblockq, chunk) < 0)
+    if (pa_memblockq_peek(c->input_memblockq, chunk) < 0) {
+        
+        if (c->dead)
+            connection_free(c);
+        
         return -1;
+    }
 
     return 0;
 }
@@ -240,7 +261,7 @@ static void source_output_push_cb(pa_source_output *o, const pa_memchunk *chunk)
     struct connection *c = o->userdata;
     assert(o && c && chunk);
 
-    pa_memblockq_push(c->output_memblockq, chunk, 0);
+    pa_memblockq_push(c->output_memblockq, chunk);
 
     /* do something */
     assert(c->protocol && c->protocol->core && c->protocol->core->mainloop && c->protocol->core->mainloop->defer_enable);
@@ -307,6 +328,7 @@ static void on_connection(pa_socket_server*s, pa_iochannel *io, void *userdata)
     c->playback.current_memblock = NULL;
     c->playback.memblock_index = 0;
     c->playback.fragment_size = 0;
+    c->dead = 0;
     
     pa_iochannel_socket_peer_to_string(io, cname, sizeof(cname));
     c->client = pa_client_new(p->core, __FILE__, cname);
@@ -339,7 +361,15 @@ static void on_connection(pa_socket_server*s, pa_iochannel *io, void *userdata)
         c->sink_input->userdata = c;
 
         l = (size_t) (pa_bytes_per_second(&p->sample_spec)*PLAYBACK_BUFFER_SECONDS);
-        c->input_memblockq = pa_memblockq_new(l, 0, pa_frame_size(&p->sample_spec), l/2, l/PLAYBACK_BUFFER_FRAGMENTS, p->core->memblock_stat);
+        c->input_memblockq = pa_memblockq_new(
+                0,
+                l,
+                0,
+                pa_frame_size(&p->sample_spec),
+                (size_t) -1,
+                l/PLAYBACK_BUFFER_FRAGMENTS,
+                NULL,
+                p->core->memblock_stat);
         assert(c->input_memblockq);
         pa_iochannel_socket_set_rcvbuf(io, l/PLAYBACK_BUFFER_FRAGMENTS*5);
         c->playback.fragment_size = l/10;
@@ -368,7 +398,15 @@ static void on_connection(pa_socket_server*s, pa_iochannel *io, void *userdata)
         c->source_output->userdata = c;
 
         l = (size_t) (pa_bytes_per_second(&p->sample_spec)*RECORD_BUFFER_SECONDS);
-        c->output_memblockq = pa_memblockq_new(l, 0, pa_frame_size(&p->sample_spec), 0, 0, p->core->memblock_stat);
+        c->output_memblockq = pa_memblockq_new(
+                0,
+                l,
+                0,
+                pa_frame_size(&p->sample_spec),
+                1,
+                0,
+                NULL,
+                p->core->memblock_stat);
         pa_iochannel_socket_set_sndbuf(io, l/RECORD_BUFFER_FRAGMENTS*2);
     }
 
diff --git a/src/polypcore/pstream.c b/src/polypcore/pstream.c
index eec93a0f..c697dc3d 100644
--- a/src/polypcore/pstream.c
+++ b/src/polypcore/pstream.c
@@ -40,12 +40,14 @@
 
 #include "pstream.h"
 
-typedef enum pa_pstream_descriptor_index {
+enum {
     PA_PSTREAM_DESCRIPTOR_LENGTH,
     PA_PSTREAM_DESCRIPTOR_CHANNEL,
-    PA_PSTREAM_DESCRIPTOR_DELTA,
+    PA_PSTREAM_DESCRIPTOR_OFFSET_HI,
+    PA_PSTREAM_DESCRIPTOR_OFFSET_LO,
+    PA_PSTREAM_DESCRIPTOR_SEEK,
     PA_PSTREAM_DESCRIPTOR_MAX
-} pa_pstream_descriptor_index;
+};
 
 typedef uint32_t pa_pstream_descriptor[PA_PSTREAM_DESCRIPTOR_MAX];
 
@@ -58,7 +60,8 @@ struct item_info {
     /* memblock info */
     pa_memchunk chunk;
     uint32_t channel;
-    uint32_t delta;
+    int64_t offset;
+    pa_seek_mode_t seek_mode;
 
     /* packet info */
     pa_packet *packet;
@@ -94,7 +97,7 @@ struct pa_pstream {
     void (*recieve_packet_callback) (pa_pstream *p, pa_packet *packet, void *userdata);
     void *recieve_packet_callback_userdata;
 
-    void (*recieve_memblock_callback) (pa_pstream *p, uint32_t channel, uint32_t delta, const pa_memchunk *chunk, void *userdata);
+    void (*recieve_memblock_callback) (pa_pstream *p, uint32_t channel, int64_t offset, pa_seek_mode_t seek, const pa_memchunk *chunk, void *userdata);
     void *recieve_memblock_callback_userdata;
 
     void (*drain_callback)(pa_pstream *p, void *userdata);
@@ -103,8 +106,8 @@ struct pa_pstream {
     pa_memblock_stat *memblock_stat;
 };
 
-static void do_write(pa_pstream *p);
-static void do_read(pa_pstream *p);
+static int do_write(pa_pstream *p);
+static int do_read(pa_pstream *p);
 
 static void do_something(pa_pstream *p) {
     assert(p);
@@ -112,31 +115,47 @@ static void do_something(pa_pstream *p) {
     p->mainloop->defer_enable(p->defer_event, 0);
 
     pa_pstream_ref(p);
-    
-    if (!p->dead && pa_iochannel_is_readable(p->io))
-        do_read(p);
 
-    if (!p->dead && pa_iochannel_is_writable(p->io))
-        do_write(p);
+    if (!p->dead && pa_iochannel_is_readable(p->io)) {
+        if (do_read(p) < 0)
+            goto fail;
+    } else if (!p->dead && pa_iochannel_is_hungup(p->io))
+        goto fail;
+
+    if (!p->dead && pa_iochannel_is_writable(p->io)) {
+        if (do_write(p) < 0)
+            goto fail;
+    }
+
+    pa_pstream_unref(p);
+    return;
+
+fail:
 
-    /* In case the line was hungup, make sure to rerun this function
-       as soon as possible, until all data has been read. */
+    p->dead = 1;
     
-    if (!p->dead && pa_iochannel_is_hungup(p->io))
-        p->mainloop->defer_enable(p->defer_event, 1);
+    if (p->die_callback)
+        p->die_callback(p, p->die_callback_userdata);
     
     pa_pstream_unref(p);
 }
 
 static void io_callback(pa_iochannel*io, void *userdata) {
     pa_pstream *p = userdata;
-    assert(p && p->io == io);
+    
+    assert(p);
+    assert(p->io == io);
+    
     do_something(p);
 }
 
 static void defer_callback(pa_mainloop_api *m, pa_defer_event *e, void*userdata) {
     pa_pstream *p = userdata;
-    assert(p && p->defer_event == e && p->mainloop == m);
+
+    assert(p);
+    assert(p->defer_event == e);
+    assert(p->mainloop == m);
+    
     do_something(p);
 }
 
@@ -144,7 +163,8 @@ pa_pstream *pa_pstream_new(pa_mainloop_api *m, pa_iochannel *io, pa_memblock_sta
     pa_pstream *p;
     assert(io);
 
-    p = pa_xmalloc(sizeof(pa_pstream));
+    p = pa_xnew(pa_pstream, 1);
+    
     p->ref = 1;
     p->io = io;
     pa_iochannel_set_callback(io, io_callback, p);
@@ -228,7 +248,7 @@ void pa_pstream_send_packet(pa_pstream*p, pa_packet *packet) {
     
 /*     pa_log(__FILE__": push-packet %p\n", packet); */
     
-    i = pa_xmalloc(sizeof(struct item_info));
+    i = pa_xnew(struct item_info, 1);
     i->type = PA_PSTREAM_ITEM_PACKET;
     i->packet = pa_packet_ref(packet);
 
@@ -236,7 +256,7 @@ void pa_pstream_send_packet(pa_pstream*p, pa_packet *packet) {
     p->mainloop->defer_enable(p->defer_event, 1);
 }
 
-void pa_pstream_send_memblock(pa_pstream*p, uint32_t channel, uint32_t delta, const pa_memchunk *chunk) {
+void pa_pstream_send_memblock(pa_pstream*p, uint32_t channel, int64_t offset, pa_seek_mode_t seek_mode, const pa_memchunk *chunk) {
     struct item_info *i;
     assert(p && channel != (uint32_t) -1 && chunk && p->ref >= 1);
 
@@ -245,11 +265,12 @@ void pa_pstream_send_memblock(pa_pstream*p, uint32_t channel, uint32_t delta, co
     
 /*     pa_log(__FILE__": push-memblock %p\n", chunk); */
     
-    i = pa_xmalloc(sizeof(struct item_info));
+    i = pa_xnew(struct item_info, 1);
     i->type = PA_PSTREAM_ITEM_MEMBLOCK;
     i->chunk = *chunk;
     i->channel = channel;
-    i->delta = delta;
+    i->offset = offset;
+    i->seek_mode = seek_mode;
 
     pa_memblock_ref(i->chunk.memblock);
 
@@ -264,7 +285,7 @@ void pa_pstream_set_recieve_packet_callback(pa_pstream *p, void (*callback) (pa_
     p->recieve_packet_callback_userdata = userdata;
 }
 
-void pa_pstream_set_recieve_memblock_callback(pa_pstream *p, void (*callback) (pa_pstream *p, uint32_t channel, uint32_t delta, const pa_memchunk *chunk, void *userdata), void *userdata) {
+void pa_pstream_set_recieve_memblock_callback(pa_pstream *p, void (*callback) (pa_pstream *p, uint32_t channel, int64_t delta, pa_seek_mode_t seek, const pa_memchunk *chunk, void *userdata), void *userdata) {
     assert(p && callback);
 
     p->recieve_memblock_callback = callback;
@@ -286,17 +307,21 @@ static void prepare_next_write_item(pa_pstream *p) {
         p->write.data = p->write.current->packet->data;
         p->write.descriptor[PA_PSTREAM_DESCRIPTOR_LENGTH] = htonl(p->write.current->packet->length);
         p->write.descriptor[PA_PSTREAM_DESCRIPTOR_CHANNEL] = htonl((uint32_t) -1);
-        p->write.descriptor[PA_PSTREAM_DESCRIPTOR_DELTA] = 0;
+        p->write.descriptor[PA_PSTREAM_DESCRIPTOR_OFFSET_HI] = 0;
+        p->write.descriptor[PA_PSTREAM_DESCRIPTOR_OFFSET_LO] = 0;
+        p->write.descriptor[PA_PSTREAM_DESCRIPTOR_SEEK] = 0;
     } else {
         assert(p->write.current->type == PA_PSTREAM_ITEM_MEMBLOCK && p->write.current->chunk.memblock);
         p->write.data = (uint8_t*) p->write.current->chunk.memblock->data + p->write.current->chunk.index;
         p->write.descriptor[PA_PSTREAM_DESCRIPTOR_LENGTH] = htonl(p->write.current->chunk.length);
         p->write.descriptor[PA_PSTREAM_DESCRIPTOR_CHANNEL] = htonl(p->write.current->channel);
-        p->write.descriptor[PA_PSTREAM_DESCRIPTOR_DELTA] = htonl(p->write.current->delta);
+        p->write.descriptor[PA_PSTREAM_DESCRIPTOR_OFFSET_HI] = htonl((uint32_t) (((uint64_t) p->write.current->offset) >> 32));
+        p->write.descriptor[PA_PSTREAM_DESCRIPTOR_OFFSET_LO] = htonl((uint32_t) ((uint64_t) p->write.current->offset));
+        p->write.descriptor[PA_PSTREAM_DESCRIPTOR_SEEK] = htonl(p->write.current->seek_mode);
     }
 }
 
-static void do_write(pa_pstream *p) {
+static int do_write(pa_pstream *p) {
     void *d;
     size_t l;
     ssize_t r;
@@ -306,7 +331,7 @@ static void do_write(pa_pstream *p) {
         prepare_next_write_item(p);
 
     if (!p->write.current)
-        return;
+        return 0;
 
     assert(p->write.data);
 
@@ -319,7 +344,7 @@ static void do_write(pa_pstream *p) {
     }
 
     if ((r = pa_iochannel_write(p->io, d, l)) < 0)
-        goto die;
+        return -1;
 
     p->write.index += r;
 
@@ -332,15 +357,10 @@ static void do_write(pa_pstream *p) {
             p->drain_callback(p, p->drain_userdata);
     }
 
-    return;
-    
-die:
-    p->dead = 1;
-    if (p->die_callback)
-        p->die_callback(p, p->die_callback_userdata);
+    return 0;
 }
 
-static void do_read(pa_pstream *p) {
+static int do_read(pa_pstream *p) {
     void *d;
     size_t l; 
     ssize_t r;
@@ -356,7 +376,7 @@ static void do_read(pa_pstream *p) {
     }
 
     if ((r = pa_iochannel_read(p->io, d, l)) <= 0)
-        goto die;
+        return -1;
     
     p->read.index += r;
 
@@ -365,8 +385,8 @@ static void do_read(pa_pstream *p) {
 
         /* Frame size too large */
         if (ntohl(p->read.descriptor[PA_PSTREAM_DESCRIPTOR_LENGTH]) > FRAME_SIZE_MAX) {
-            pa_log(__FILE__": Frame size too large\n");
-            goto die;
+            pa_log_warn(__FILE__": Frame size too large\n");
+            return -1;
         }
         
         assert(!p->read.packet && !p->read.memblock);
@@ -374,13 +394,16 @@ static void do_read(pa_pstream *p) {
         if (ntohl(p->read.descriptor[PA_PSTREAM_DESCRIPTOR_CHANNEL]) == (uint32_t) -1) {
             /* Frame is a packet frame */
             p->read.packet = pa_packet_new(ntohl(p->read.descriptor[PA_PSTREAM_DESCRIPTOR_LENGTH]));
-            assert(p->read.packet);
             p->read.data = p->read.packet->data;
         } else {
             /* Frame is a memblock frame */
             p->read.memblock = pa_memblock_new(ntohl(p->read.descriptor[PA_PSTREAM_DESCRIPTOR_LENGTH]), p->memblock_stat);
-            assert(p->read.memblock);
             p->read.data = p->read.memblock->data;
+
+            if (ntohl(p->read.descriptor[PA_PSTREAM_DESCRIPTOR_SEEK]) > PA_SEEK_RELATIVE_END) {
+                pa_log_warn(__FILE__": Invalid seek mode\n");
+                return -1;
+            }
         }
             
     } else if (p->read.index > PA_PSTREAM_DESCRIPTOR_SIZE) {
@@ -396,13 +419,26 @@ static void do_read(pa_pstream *p) {
                 chunk.index = p->read.index - PA_PSTREAM_DESCRIPTOR_SIZE - l;
                 chunk.length = l;
 
-                if (p->recieve_memblock_callback)
+                if (p->recieve_memblock_callback) {
+                    int64_t offset;
+
+                    offset = (int64_t) (
+                            (((uint64_t) ntohl(p->read.descriptor[PA_PSTREAM_DESCRIPTOR_OFFSET_HI])) << 32) |
+                            (((uint64_t) ntohl(p->read.descriptor[PA_PSTREAM_DESCRIPTOR_OFFSET_LO]))));
+                    
                     p->recieve_memblock_callback(
                         p,
                         ntohl(p->read.descriptor[PA_PSTREAM_DESCRIPTOR_CHANNEL]),
-                        ntohl(p->read.descriptor[PA_PSTREAM_DESCRIPTOR_DELTA]),
+                        offset,
+                        ntohl(p->read.descriptor[PA_PSTREAM_DESCRIPTOR_SEEK]),
                         &chunk,
                         p->recieve_memblock_callback_userdata);
+                }
+
+                /* Drop seek info for following callbacks */
+                p->read.descriptor[PA_PSTREAM_DESCRIPTOR_SEEK] =
+                    p->read.descriptor[PA_PSTREAM_DESCRIPTOR_OFFSET_HI] =
+                    p->read.descriptor[PA_PSTREAM_DESCRIPTOR_OFFSET_LO] = 0;
             }
         }
 
@@ -427,13 +463,7 @@ static void do_read(pa_pstream *p) {
         }
     }
 
-    return;
-
-die:
-    p->dead = 1;
-    if (p->die_callback)
-        p->die_callback(p, p->die_callback_userdata);
-   
+    return 0;   
 }
 
 void pa_pstream_set_die_callback(pa_pstream *p, void (*callback)(pa_pstream *p, void *userdata), void *userdata) {
@@ -453,20 +483,24 @@ int pa_pstream_is_pending(pa_pstream *p) {
 
 void pa_pstream_set_drain_callback(pa_pstream *p, void (*cb)(pa_pstream *p, void *userdata), void *userdata) {
     assert(p);
+    assert(p->ref >= 1);
 
     p->drain_callback = cb;
     p->drain_userdata = userdata;
 }
 
 void pa_pstream_unref(pa_pstream*p) {
-    assert(p && p->ref >= 1);
+    assert(p);
+    assert(p->ref >= 1);
 
-    if (!(--(p->ref)))
+    if (--p->ref == 0)
         pstream_free(p);
 }
 
 pa_pstream* pa_pstream_ref(pa_pstream*p) {
-    assert(p && p->ref >= 1);
+    assert(p);
+    assert(p->ref >= 1);
+    
     p->ref++;
     return p;
 }
diff --git a/src/polypcore/pstream.h b/src/polypcore/pstream.h
index 10ce58f6..741ba9b5 100644
--- a/src/polypcore/pstream.h
+++ b/src/polypcore/pstream.h
@@ -25,6 +25,7 @@
 #include <inttypes.h>
 
 #include <polyp/mainloop-api.h>
+#include <polyp/def.h>
 #include <polypcore/packet.h>
 #include <polypcore/memblock.h>
 #include <polypcore/iochannel.h>
@@ -37,10 +38,10 @@ void pa_pstream_unref(pa_pstream*p);
 pa_pstream* pa_pstream_ref(pa_pstream*p);
 
 void pa_pstream_send_packet(pa_pstream*p, pa_packet *packet);
-void pa_pstream_send_memblock(pa_pstream*p, uint32_t channel, uint32_t delta, const pa_memchunk *chunk);
+void pa_pstream_send_memblock(pa_pstream*p, uint32_t channel, int64_t offset, pa_seek_mode_t seek, const pa_memchunk *chunk);
 
 void pa_pstream_set_recieve_packet_callback(pa_pstream *p, void (*callback) (pa_pstream *p, pa_packet *packet, void *userdata), void *userdata);
-void pa_pstream_set_recieve_memblock_callback(pa_pstream *p, void (*callback) (pa_pstream *p, uint32_t channel, uint32_t delta, const pa_memchunk *chunk, void *userdata), void *userdata);
+void pa_pstream_set_recieve_memblock_callback(pa_pstream *p, void (*callback) (pa_pstream *p, uint32_t channel, int64_t offset, pa_seek_mode_t seek, const pa_memchunk *chunk, void *userdata), void *userdata);
 void pa_pstream_set_drain_callback(pa_pstream *p, void (*cb)(pa_pstream *p, void *userdata), void *userdata);
 
 void pa_pstream_set_die_callback(pa_pstream *p, void (*callback)(pa_pstream *p, void *userdata), void *userdata);
diff --git a/src/polypcore/sample-util.c b/src/polypcore/sample-util.c
index e3bb4aa6..e588446d 100644
--- a/src/polypcore/sample-util.c
+++ b/src/polypcore/sample-util.c
@@ -34,6 +34,15 @@
 
 #include "sample-util.h"
 
+pa_memblock *pa_silence_memblock_new(const pa_sample_spec *spec, size_t length, pa_memblock_stat*s) {
+    assert(spec);
+
+    if (length == 0)
+        length = pa_bytes_per_second(spec)/10; /* 100 ms */
+
+    return pa_silence_memblock(pa_memblock_new(length, s), spec);
+}
+
 pa_memblock *pa_silence_memblock(pa_memblock* b, const pa_sample_spec *spec) {
     assert(b && b->data && spec);
     pa_silence_memory(b->data, b->length, spec);
diff --git a/src/polypcore/sample-util.h b/src/polypcore/sample-util.h
index 486d284b..7ea01a30 100644
--- a/src/polypcore/sample-util.h
+++ b/src/polypcore/sample-util.h
@@ -28,6 +28,7 @@
 #include <polypcore/memchunk.h>
 
 pa_memblock *pa_silence_memblock(pa_memblock* b, const pa_sample_spec *spec);
+pa_memblock *pa_silence_memblock_new(const pa_sample_spec *spec, size_t length, pa_memblock_stat*s);
 void pa_silence_memchunk(pa_memchunk *c, const pa_sample_spec *spec);
 void pa_silence_memory(void *p, size_t length, const pa_sample_spec *spec);
 
diff --git a/src/polypcore/sink.c b/src/polypcore/sink.c
index 9bc478c3..1f374f5e 100644
--- a/src/polypcore/sink.c
+++ b/src/polypcore/sink.c
@@ -270,6 +270,8 @@ int pa_sink_render(pa_sink*s, size_t length, pa_memchunk *result) {
         result->memblock = pa_memblock_new(length, s->core->memblock_stat);
         assert(result->memblock);
 
+/*          pa_log("mixing %i\n", n);  */
+
         result->length = pa_mix(info, n, result->memblock->data, length, &s->sample_spec, &s->sw_volume);
         result->index = 0;
     }
diff --git a/src/polypcore/sink.h b/src/polypcore/sink.h
index 5fd9784f..fa120ebf 100644
--- a/src/polypcore/sink.h
+++ b/src/polypcore/sink.h
@@ -34,7 +34,7 @@ typedef struct pa_sink pa_sink;
 #include <polypcore/source.h>
 #include <polypcore/module.h>
 
-#define PA_MAX_INPUTS_PER_SINK 6
+#define PA_MAX_INPUTS_PER_SINK 32
 
 typedef enum pa_sink_state {
     PA_SINK_RUNNING,