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jitterbuffer: use separate thread for timeouts

Browse source 
Use a separate thread for scheduling the timeouts instead of using the
downstream streaming thread that might block at any time.
This commit is contained in:
Wim Taymans 2013-09-16 15:53:47 +02:00
parent b363832c2c
commit 4de919a17a
1 changed files with 187 additions and 154 deletions
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159
gst/rtpmanager/gstrtpjitterbuffer.c
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@ -117,17 +117,29 @@ enum
if (G_UNLIKELY (priv->srcresult != GST_FLOW_OK)) \ if (G_UNLIKELY (priv->srcresult != GST_FLOW_OK)) \
goto label; \ goto label; \
} G_STMT_END } G_STMT_END
#define JBUF_UNLOCK(priv) (g_mutex_unlock (&(priv)->jbuf_lock)) #define JBUF_UNLOCK(priv) (g_mutex_unlock (&(priv)->jbuf_lock))
#define JBUF_WAIT(priv) (g_cond_wait (&(priv)->jbuf_cond, &(priv)->jbuf_lock))
#define JBUF_WAIT_CHECK(priv,label) G_STMT_START { \ #define JBUF_WAIT_TIMER(priv) G_STMT_START { \
JBUF_WAIT(priv); \ (priv)->waiting_timer = TRUE; \
g_cond_wait (&(priv)->jbuf_timer, &(priv)->jbuf_lock); \
(priv)->waiting_timer = FALSE; \
} G_STMT_END
#define JBUF_SIGNAL_TIMER(priv) G_STMT_START { \
if (G_UNLIKELY ((priv)->waiting_timer)) \
g_cond_signal (&(priv)->jbuf_timer); \
} G_STMT_END
#define JBUF_WAIT_EVENT(priv,label) G_STMT_START { \
(priv)->waiting_event = TRUE; \
g_cond_wait (&(priv)->jbuf_event, &(priv)->jbuf_lock); \
(priv)->waiting_event = FALSE; \
if (G_UNLIKELY (priv->srcresult != GST_FLOW_OK)) \ if (G_UNLIKELY (priv->srcresult != GST_FLOW_OK)) \
goto label; \ goto label; \
} G_STMT_END } G_STMT_END
#define JBUF_SIGNAL_EVENT(priv) G_STMT_START { \
#define JBUF_SIGNAL(priv) (g_cond_signal (&(priv)->jbuf_cond)) if (G_UNLIKELY ((priv)->waiting_event)) \
g_cond_signal (&(priv)->jbuf_event); \
} G_STMT_END
struct _GstRtpJitterBufferPrivate struct _GstRtpJitterBufferPrivate
{ {
@ -136,13 +148,18 @@ struct _GstRtpJitterBufferPrivate
RTPJitterBuffer *jbuf; RTPJitterBuffer *jbuf;
GMutex jbuf_lock; GMutex jbuf_lock;
GCond jbuf_cond; gboolean waiting_timer;
gboolean waiting; GCond jbuf_timer;
gboolean waiting_event;
GCond jbuf_event;
gboolean discont; gboolean discont;
gboolean ts_discont; gboolean ts_discont;
gboolean active; gboolean active;
guint64 out_offset; guint64 out_offset;
gboolean timer_running;
GThread *timer_thread;
/* properties */ /* properties */
guint latency_ms; guint latency_ms;
guint64 latency_ns; guint64 latency_ns;
@ -321,6 +338,8 @@ static void do_handle_sync (GstRtpJitterBuffer * jitterbuffer);
static void unschedule_current_timer (GstRtpJitterBuffer * jitterbuffer); static void unschedule_current_timer (GstRtpJitterBuffer * jitterbuffer);
static void remove_all_timers (GstRtpJitterBuffer * jitterbuffer); static void remove_all_timers (GstRtpJitterBuffer * jitterbuffer);
static void wait_next_timeout (GstRtpJitterBuffer * jitterbuffer);
static void static void
gst_rtp_jitter_buffer_class_init (GstRtpJitterBufferClass * klass) gst_rtp_jitter_buffer_class_init (GstRtpJitterBufferClass * klass)
{ {
@ -596,7 +615,8 @@ gst_rtp_jitter_buffer_init (GstRtpJitterBuffer * jitterbuffer)
priv->timers = g_array_new (FALSE, TRUE, sizeof (TimerData)); priv->timers = g_array_new (FALSE, TRUE, sizeof (TimerData));
priv->jbuf = rtp_jitter_buffer_new (); priv->jbuf = rtp_jitter_buffer_new ();
g_mutex_init (&priv->jbuf_lock); g_mutex_init (&priv->jbuf_lock);
g_cond_init (&priv->jbuf_cond); g_cond_init (&priv->jbuf_timer);
g_cond_init (&priv->jbuf_event);
/* reset skew detection initialy */ /* reset skew detection initialy */
rtp_jitter_buffer_reset_skew (priv->jbuf); rtp_jitter_buffer_reset_skew (priv->jbuf);
@ -641,7 +661,8 @@ gst_rtp_jitter_buffer_finalize (GObject * object)
g_array_free (jitterbuffer->priv->timers, TRUE); g_array_free (jitterbuffer->priv->timers, TRUE);
g_mutex_clear (&jitterbuffer->priv->jbuf_lock); g_mutex_clear (&jitterbuffer->priv->jbuf_lock);
g_cond_clear (&jitterbuffer->priv->jbuf_cond); g_cond_clear (&jitterbuffer->priv->jbuf_timer);
g_cond_clear (&jitterbuffer->priv->jbuf_event);
g_object_unref (jitterbuffer->priv->jbuf); g_object_unref (jitterbuffer->priv->jbuf);
@ -831,7 +852,7 @@ gst_rtp_jitter_buffer_set_active (GstRtpJitterBuffer * jbuf, gboolean active,
GST_DEBUG_OBJECT (jbuf, "out offset %" GST_TIME_FORMAT, GST_DEBUG_OBJECT (jbuf, "out offset %" GST_TIME_FORMAT,
GST_TIME_ARGS (priv->out_offset)); GST_TIME_ARGS (priv->out_offset));
priv->active = active; priv->active = active;
JBUF_SIGNAL (priv); JBUF_SIGNAL_EVENT (priv);
} }
if (!active) { if (!active) {
rtp_jitter_buffer_set_buffering (priv->jbuf, TRUE); rtp_jitter_buffer_set_buffering (priv->jbuf, TRUE);
@ -980,7 +1001,7 @@ gst_rtp_jitter_buffer_flush_start (GstRtpJitterBuffer * jitterbuffer)
priv->srcresult = GST_FLOW_FLUSHING; priv->srcresult = GST_FLOW_FLUSHING;
GST_DEBUG_OBJECT (jitterbuffer, "Disabling pop on queue"); GST_DEBUG_OBJECT (jitterbuffer, "Disabling pop on queue");
/* this unblocks any waiting pops on the src pad task */ /* this unblocks any waiting pops on the src pad task */
JBUF_SIGNAL (priv); JBUF_SIGNAL_EVENT (priv);
/* unlock clock, we just unschedule, the entry will be released by the /* unlock clock, we just unschedule, the entry will be released by the
* locking streaming thread. */ * locking streaming thread. */
unschedule_current_timer (jitterbuffer); unschedule_current_timer (jitterbuffer);
@ -1077,13 +1098,16 @@ gst_rtp_jitter_buffer_change_state (GstElement * element,
priv->last_pt = -1; priv->last_pt = -1;
/* block until we go to PLAYING */ /* block until we go to PLAYING */
priv->blocked = TRUE; priv->blocked = TRUE;
priv->timer_running = TRUE;
priv->timer_thread =
g_thread_new ("timer", (GThreadFunc) wait_next_timeout, jitterbuffer);
JBUF_UNLOCK (priv); JBUF_UNLOCK (priv);
break; break;
case GST_STATE_CHANGE_PAUSED_TO_PLAYING: case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
JBUF_LOCK (priv); JBUF_LOCK (priv);
/* unblock to allow streaming in PLAYING */ /* unblock to allow streaming in PLAYING */
priv->blocked = FALSE; priv->blocked = FALSE;
JBUF_SIGNAL (priv); JBUF_SIGNAL_EVENT (priv);
JBUF_UNLOCK (priv); JBUF_UNLOCK (priv);
break; break;
default: default:
@ -1108,7 +1132,13 @@ gst_rtp_jitter_buffer_change_state (GstElement * element,
ret = GST_STATE_CHANGE_NO_PREROLL; ret = GST_STATE_CHANGE_NO_PREROLL;
break; break;
case GST_STATE_CHANGE_PAUSED_TO_READY: case GST_STATE_CHANGE_PAUSED_TO_READY:
JBUF_LOCK (priv);
gst_buffer_replace (&priv->last_sr, NULL); gst_buffer_replace (&priv->last_sr, NULL);
priv->timer_running = FALSE;
JBUF_SIGNAL_TIMER (priv);
JBUF_UNLOCK (priv);
g_thread_join (priv->timer_thread);
priv->timer_thread = NULL;
break; break;
case GST_STATE_CHANGE_READY_TO_NULL: case GST_STATE_CHANGE_READY_TO_NULL:
break; break;
@ -1229,7 +1259,7 @@ gst_rtp_jitter_buffer_sink_event (GstPad * pad, GstObject * parent,
if (ret && !priv->eos) { if (ret && !priv->eos) {
GST_INFO_OBJECT (jitterbuffer, "queuing EOS"); GST_INFO_OBJECT (jitterbuffer, "queuing EOS");
priv->eos = TRUE; priv->eos = TRUE;
JBUF_SIGNAL (priv); JBUF_SIGNAL_EVENT (priv);
} else if (priv->eos) { } else if (priv->eos) {
GST_DEBUG_OBJECT (jitterbuffer, "dropping EOS, we are already EOS"); GST_DEBUG_OBJECT (jitterbuffer, "dropping EOS, we are already EOS");
} else { } else {
@ -1479,6 +1509,7 @@ add_timer (GstRtpJitterBuffer * jitterbuffer, TimerType type,
timer->rtx_retry = 0; timer->rtx_retry = 0;
} }
recalculate_timer (jitterbuffer, timer); recalculate_timer (jitterbuffer, timer);
JBUF_SIGNAL_TIMER (priv);
return timer; return timer;
} }
@ -1599,6 +1630,7 @@ update_timers (GstRtpJitterBuffer * jitterbuffer, guint16 seqnum,
continue; continue;
if (gap == 0) { if (gap == 0) {
GST_DEBUG ("found timer for current seqnum");
/* the timer for the current seqnum */ /* the timer for the current seqnum */
timer = test; timer = test;
} else if (gap > priv->rtx_delay_reorder) { } else if (gap > priv->rtx_delay_reorder) {
@ -1624,6 +1656,7 @@ update_timers (GstRtpJitterBuffer * jitterbuffer, guint16 seqnum,
/* if we had a timer, remove it, we don't know when to expect the next /* if we had a timer, remove it, we don't know when to expect the next
* packet. */ * packet. */
remove_timer (jitterbuffer, timer); remove_timer (jitterbuffer, timer);
JBUF_SIGNAL_EVENT (priv);
} }
} }
@ -1676,8 +1709,9 @@ calculate_expected (GstRtpJitterBuffer * jitterbuffer, guint32 expected,
expected_dts = priv->last_in_dts + duration; expected_dts = priv->last_in_dts + duration;
if (priv->do_retransmission) { if (priv->do_retransmission) {
expected++;
type = TIMER_TYPE_EXPECTED; type = TIMER_TYPE_EXPECTED;
if (find_timer (jitterbuffer, type, expected))
expected++;
} else { } else {
type = TIMER_TYPE_LOST; type = TIMER_TYPE_LOST;
} }
@ -1894,8 +1928,8 @@ gst_rtp_jitter_buffer_chain (GstPad * pad, GstObject * parent,
do_handle_sync (jitterbuffer); do_handle_sync (jitterbuffer);
/* signal addition of new buffer when the _loop is waiting. */ /* signal addition of new buffer when the _loop is waiting. */
if (priv->waiting && priv->active) if (priv->active && priv->waiting_timer)
JBUF_SIGNAL (priv); JBUF_SIGNAL_EVENT (priv);
/* let's unschedule and unblock any waiting buffers. We only want to do this /* let's unschedule and unblock any waiting buffers. We only want to do this
* when the tail buffer changed */ * when the tail buffer changed */
@ -2194,7 +2228,7 @@ wait:
} }
/* the timeout for when we expected a packet expired */ /* the timeout for when we expected a packet expired */
static GstFlowReturn static void
do_expected_timeout (GstRtpJitterBuffer * jitterbuffer, TimerData * timer, do_expected_timeout (GstRtpJitterBuffer * jitterbuffer, TimerData * timer,
GstClockTimeDiff clock_jitter) GstClockTimeDiff clock_jitter)
{ {
@ -2228,12 +2262,10 @@ do_expected_timeout (GstRtpJitterBuffer * jitterbuffer, TimerData * timer,
} }
reschedule_timer (jitterbuffer, timer, timer->seqnum, reschedule_timer (jitterbuffer, timer, timer->seqnum,
timer->rtx_base + timer->rtx_retry); timer->rtx_base + timer->rtx_retry);
return priv->srcresult;
} }
/* a packet is lost */ /* a packet is lost */
static GstFlowReturn static void
do_lost_timeout (GstRtpJitterBuffer * jitterbuffer, TimerData * timer, do_lost_timeout (GstRtpJitterBuffer * jitterbuffer, TimerData * timer,
GstClockTimeDiff clock_jitter) GstClockTimeDiff clock_jitter)
{ {
@ -2286,6 +2318,7 @@ do_lost_timeout (GstRtpJitterBuffer * jitterbuffer, TimerData * timer,
priv->next_seqnum = (timer->seqnum + lost_packets) & 0xffff; priv->next_seqnum = (timer->seqnum + lost_packets) & 0xffff;
/* remove timer now */ /* remove timer now */
remove_timer (jitterbuffer, timer); remove_timer (jitterbuffer, timer);
JBUF_SIGNAL_EVENT (priv);
if (priv->do_lost) { if (priv->do_lost) {
GstEvent *event; GstEvent *event;
@ -2299,25 +2332,31 @@ do_lost_timeout (GstRtpJitterBuffer * jitterbuffer, TimerData * timer,
"late", G_TYPE_BOOLEAN, lost_packets_late, NULL)); "late", G_TYPE_BOOLEAN, lost_packets_late, NULL));
JBUF_UNLOCK (priv); JBUF_UNLOCK (priv);
gst_pad_push_event (priv->srcpad, event); gst_pad_push_event (priv->srcpad, event);
JBUF_LOCK_CHECK (priv, flushing); JBUF_LOCK (priv);
}
return GST_FLOW_OK;
/* ERRORS */
flushing:
{
GST_DEBUG_OBJECT (jitterbuffer, "we are flushing");
return priv->srcresult;
} }
} }
static GstFlowReturn static void
do_eos_timeout (GstRtpJitterBuffer * jitterbuffer, TimerData * timer) do_eos_timeout (GstRtpJitterBuffer * jitterbuffer, TimerData * timer)
{ {
GstRtpJitterBufferPrivate *priv = jitterbuffer->priv;
GST_INFO_OBJECT (jitterbuffer, "got the NPT timeout"); GST_INFO_OBJECT (jitterbuffer, "got the NPT timeout");
remove_timer (jitterbuffer, timer); remove_timer (jitterbuffer, timer);
JBUF_SIGNAL_EVENT (priv);
}
return GST_FLOW_EOS; static void
do_deadline_timeout (GstRtpJitterBuffer * jitterbuffer, TimerData * timer,
GstClockTimeDiff clock_jitter)
{
GstRtpJitterBufferPrivate *priv = jitterbuffer->priv;
GST_INFO_OBJECT (jitterbuffer, "got deadline timeout");
priv->next_seqnum = timer->seqnum;
remove_timer (jitterbuffer, timer);
JBUF_SIGNAL_EVENT (priv);
} }
/* called when we need to wait for the next timeout. /* called when we need to wait for the next timeout.
@ -2327,14 +2366,16 @@ do_eos_timeout (GstRtpJitterBuffer * jitterbuffer, TimerData * timer)
* *
* If there are no timers, we wait on a gcond until something new happens. * If there are no timers, we wait on a gcond until something new happens.
*/ */
static GstFlowReturn static void
wait_next_timeout (GstRtpJitterBuffer * jitterbuffer) wait_next_timeout (GstRtpJitterBuffer * jitterbuffer)
{ {
GstRtpJitterBufferPrivate *priv = jitterbuffer->priv; GstRtpJitterBufferPrivate *priv = jitterbuffer->priv;
GstFlowReturn result = GST_FLOW_OK;
gint i, len; JBUF_LOCK (priv);
while (priv->timer_running) {
TimerData *timer = NULL; TimerData *timer = NULL;
GstClockTime timer_timeout = -1; GstClockTime timer_timeout = -1;
gint i, len;
gint timer_idx; gint timer_idx;
len = priv->timers->len; len = priv->timers->len;
@ -2342,8 +2383,8 @@ wait_next_timeout (GstRtpJitterBuffer * jitterbuffer)
TimerData *test = &g_array_index (priv->timers, TimerData, i); TimerData *test = &g_array_index (priv->timers, TimerData, i);
GstClockTime test_timeout = get_timeout (jitterbuffer, test); GstClockTime test_timeout = get_timeout (jitterbuffer, test);
GST_DEBUG_OBJECT (jitterbuffer, "%d, %d, %" GST_TIME_FORMAT, GST_DEBUG_OBJECT (jitterbuffer, "%d, %d, %d, %" GST_TIME_FORMAT,
i, test->seqnum, GST_TIME_ARGS (test_timeout)); i, test->type, test->seqnum, GST_TIME_ARGS (test_timeout));
/* find the smallest timeout */ /* find the smallest timeout */
if (timer == NULL || test_timeout == -1 || test_timeout < timer_timeout) { if (timer == NULL || test_timeout == -1 || test_timeout < timer_timeout) {
@ -2396,20 +2437,17 @@ wait_next_timeout (GstRtpJitterBuffer * jitterbuffer)
ret = gst_clock_id_wait (id, &clock_jitter); ret = gst_clock_id_wait (id, &clock_jitter);
JBUF_LOCK (priv); JBUF_LOCK (priv);
if (!priv->timer_running)
break;
GST_DEBUG_OBJECT (jitterbuffer, "sync done, %d, #%d, %" G_GINT64_FORMAT, GST_DEBUG_OBJECT (jitterbuffer, "sync done, %d, #%d, %" G_GINT64_FORMAT,
ret, priv->timer_seqnum, clock_jitter); ret, priv->timer_seqnum, clock_jitter);
/* and free the entry */ /* and free the entry */
gst_clock_id_unref (id); gst_clock_id_unref (id);
priv->clock_id = NULL; priv->clock_id = NULL;
/* at this point, the clock could have been unlocked by a timeout, a new
* tail element was added to the queue or because we are shutting down. Check
* for shutdown first. */
if (G_UNLIKELY (priv->srcresult != GST_FLOW_OK))
goto flushing;
if (priv->timers->len <= timer_idx) if (priv->timers->len <= timer_idx)
goto done; continue;
/* we released the lock, the array might have changed */ /* we released the lock, the array might have changed */
timer = &g_array_index (priv->timers, TimerData, timer_idx); timer = &g_array_index (priv->timers, TimerData, timer_idx);
@ -2422,42 +2460,33 @@ wait_next_timeout (GstRtpJitterBuffer * jitterbuffer)
* Grab it and try to push or sync. */ * Grab it and try to push or sync. */
if (ret == GST_CLOCK_UNSCHEDULED || priv->unscheduled) { if (ret == GST_CLOCK_UNSCHEDULED || priv->unscheduled) {
GST_DEBUG_OBJECT (jitterbuffer, "Wait got unscheduled"); GST_DEBUG_OBJECT (jitterbuffer, "Wait got unscheduled");
goto done; continue;
} }
do_timeout: do_timeout:
switch (timer->type) { switch (timer->type) {
case TIMER_TYPE_EXPECTED: case TIMER_TYPE_EXPECTED:
result = do_expected_timeout (jitterbuffer, timer, clock_jitter); do_expected_timeout (jitterbuffer, timer, clock_jitter);
break; break;
case TIMER_TYPE_LOST: case TIMER_TYPE_LOST:
result = do_lost_timeout (jitterbuffer, timer, clock_jitter); do_lost_timeout (jitterbuffer, timer, clock_jitter);
break; break;
case TIMER_TYPE_DEADLINE: case TIMER_TYPE_DEADLINE:
priv->next_seqnum = timer->seqnum; do_deadline_timeout (jitterbuffer, timer, clock_jitter);
remove_timer (jitterbuffer, timer);
break; break;
case TIMER_TYPE_EOS: case TIMER_TYPE_EOS:
result = do_eos_timeout (jitterbuffer, timer); do_eos_timeout (jitterbuffer, timer);
break; break;
} }
} else { } else {
/* no timers, wait for activity */ /* no timers, wait for activity */
GST_DEBUG_OBJECT (jitterbuffer, "waiting"); GST_DEBUG_OBJECT (jitterbuffer, "waiting");
priv->waiting = TRUE; JBUF_WAIT_TIMER (priv);
JBUF_WAIT_CHECK (priv, flushing);
priv->waiting = FALSE;
GST_DEBUG_OBJECT (jitterbuffer, "waiting done"); GST_DEBUG_OBJECT (jitterbuffer, "waiting done");
} }
done:
return result;
flushing:
{
GST_DEBUG_OBJECT (jitterbuffer, "we are flushing");
return priv->srcresult;
} }
GST_DEBUG_OBJECT (jitterbuffer, "we are stopping");
return;
} }
/* /*
@ -2477,9 +2506,13 @@ gst_rtp_jitter_buffer_loop (GstRtpJitterBuffer * jitterbuffer)
JBUF_LOCK_CHECK (priv, flushing); JBUF_LOCK_CHECK (priv, flushing);
do { do {
result = handle_next_buffer (jitterbuffer); result = handle_next_buffer (jitterbuffer);
if (G_LIKELY (result == GST_FLOW_WAIT)) if (G_LIKELY (result == GST_FLOW_WAIT)) {
GST_DEBUG_OBJECT (jitterbuffer, "waiting for event");
/* now wait for the next event */ /* now wait for the next event */
result = wait_next_timeout (jitterbuffer); JBUF_WAIT_EVENT (priv, flushing);
GST_DEBUG_OBJECT (jitterbuffer, "waiting for event done");
result = GST_FLOW_OK;
}
} }
while (result == GST_FLOW_OK); while (result == GST_FLOW_OK);
JBUF_UNLOCK (priv); JBUF_UNLOCK (priv);