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rtpbin: add option for increasing ts_offset gradually

Browse source 
Instant large changes to ts_offset may cause timestamps to move
backwards and also cause visible effects in media playback. The new
option max-ts-offset-adjustment lets the application control the rate to
apply changes to ts_offset.

https://bugzilla.gnome.org/show_bug.cgi?id=784002
This commit is contained in:
Patrick Radizi 2017-09-14 11:20:17 +02:00 committed by Sebastian Dröge
parent a08d7cdef5
commit 23f7739ba4
6 changed files with 156 additions and 6 deletions
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31
gst/rtpmanager/gstrtpbin.c
View file

@ -309,6 +309,7 @@ enum
#define DEFAULT_MAX_MISORDER_TIME 2000
#define DEFAULT_RFC7273_SYNC FALSE
#define DEFAULT_MAX_STREAMS G_MAXUINT
#define DEFAULT_MAX_TS_OFFSET_ADJUSTMENT 0
enum
{
@ -333,7 +334,8 @@ enum
PROP_MAX_DROPOUT_TIME,
PROP_MAX_MISORDER_TIME,
PROP_RFC7273_SYNC,
PROP_MAX_STREAMS
PROP_MAX_STREAMS,
PROP_MAX_TS_OFFSET_ADJUSTMENT
};
#define GST_RTP_BIN_RTCP_SYNC_TYPE (gst_rtp_bin_rtcp_sync_get_type())
@ -1759,6 +1761,8 @@ create_stream (GstRtpBinSession * session, guint32 ssrc)
g_object_set (buffer, "max-dropout-time", rtpbin->max_dropout_time,
"max-misorder-time", rtpbin->max_misorder_time, NULL);
g_object_set (buffer, "rfc7273-sync", rtpbin->rfc7273_sync, NULL);
g_object_set (buffer, "max-ts-offset-adjustment",
rtpbin->max_ts_offset_adjustment, NULL);
g_signal_emit (rtpbin, gst_rtp_bin_signals[SIGNAL_NEW_JITTERBUFFER], 0,
buffer, session->id, ssrc);
@ -2493,6 +2497,22 @@ gst_rtp_bin_class_init (GstRtpBinClass * klass)
0, G_MAXUINT, DEFAULT_MAX_STREAMS,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstRtpBin:max-ts-offset-adjustment:
*
* Syncing time stamps to NTP time adds a time offset. This parameter
* specifies the maximum number of nanoseconds per frame that this time offset
* may be adjusted with. This is used to avoid sudden large changes to time
* stamps.
*/
g_object_class_install_property (gobject_class, PROP_MAX_TS_OFFSET_ADJUSTMENT,
g_param_spec_uint64 ("max-ts-offset-adjustment",
"Max Timestamp Offset Adjustment",
"The maximum number of nanoseconds per frame that time stamp offsets "
"may be adjusted (0 = no limit).", 0, G_MAXUINT64,
DEFAULT_MAX_TS_OFFSET_ADJUSTMENT, G_PARAM_READWRITE |
G_PARAM_STATIC_STRINGS));
gstelement_class->change_state = GST_DEBUG_FUNCPTR (gst_rtp_bin_change_state);
gstelement_class->request_new_pad =
GST_DEBUG_FUNCPTR (gst_rtp_bin_request_new_pad);
@ -2564,6 +2584,7 @@ gst_rtp_bin_init (GstRtpBin * rtpbin)
rtpbin->max_misorder_time = DEFAULT_MAX_MISORDER_TIME;
rtpbin->rfc7273_sync = DEFAULT_RFC7273_SYNC;
rtpbin->max_streams = DEFAULT_MAX_STREAMS;
rtpbin->max_ts_offset_adjustment = DEFAULT_MAX_TS_OFFSET_ADJUSTMENT;
/* some default SDES entries */
cname = g_strdup_printf ("user%u@host-%x", g_random_int (), g_random_int ());
@ -2788,6 +2809,11 @@ gst_rtp_bin_set_property (GObject * object, guint prop_id,
case PROP_MAX_STREAMS:
rtpbin->max_streams = g_value_get_uint (value);
break;
case PROP_MAX_TS_OFFSET_ADJUSTMENT:
rtpbin->max_ts_offset_adjustment = g_value_get_uint64 (value);
gst_rtp_bin_propagate_property_to_jitterbuffer (rtpbin,
"max-ts-offset-adjustment", value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
@ -2876,6 +2902,9 @@ gst_rtp_bin_get_property (GObject * object, guint prop_id,
case PROP_MAX_STREAMS:
g_value_set_uint (value, rtpbin->max_streams);
break;
case PROP_MAX_TS_OFFSET_ADJUSTMENT:
g_value_set_uint64 (value, rtpbin->max_ts_offset_adjustment);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;

1
gst/rtpmanager/gstrtpbin.h
View file

@ -75,6 +75,7 @@ struct _GstRtpBin {
guint32 max_misorder_time;
gboolean rfc7273_sync;
guint max_streams;
guint64 max_ts_offset_adjustment;
/* a list of session */
GSList *sessions;

94
gst/rtpmanager/gstrtpjitterbuffer.c
View file

@ -131,6 +131,7 @@ enum
#define DEFAULT_LATENCY_MS 200
#define DEFAULT_DROP_ON_LATENCY FALSE
#define DEFAULT_TS_OFFSET 0
#define DEFAULT_MAX_TS_OFFSET_ADJUSTMENT 0
#define DEFAULT_DO_LOST FALSE
#define DEFAULT_MODE RTP_JITTER_BUFFER_MODE_SLAVE
#define DEFAULT_PERCENT 0
@ -160,6 +161,7 @@ enum
PROP_LATENCY,
PROP_DROP_ON_LATENCY,
PROP_TS_OFFSET,
PROP_MAX_TS_OFFSET_ADJUSTMENT,
PROP_DO_LOST,
PROP_MODE,
PROP_PERCENT,
@ -281,6 +283,7 @@ struct _GstRtpJitterBufferPrivate
guint64 latency_ns;
gboolean drop_on_latency;
gint64 ts_offset;
guint64 max_ts_offset_adjustment;
gboolean do_lost;
gboolean do_retransmission;
gboolean rtx_next_seqnum;
@ -337,7 +340,7 @@ struct _GstRtpJitterBufferPrivate
gint last_pt;
gint32 clock_rate;
gint64 clock_base;
gint64 prev_ts_offset;
gint64 ts_offset_remainder;
/* when we are shutting down */
GstFlowReturn srcresult;
@ -368,6 +371,7 @@ struct _GstRtpJitterBufferPrivate
/* for the jitter */
GstClockTime last_dts;
GstClockTime last_pts;
guint64 last_rtptime;
GstClockTime avg_jitter;
};
@ -549,6 +553,20 @@ gst_rtp_jitter_buffer_class_init (GstRtpJitterBufferClass * klass)
G_MAXINT64, DEFAULT_TS_OFFSET,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstRtpJitterBuffer:max-ts-offset-adjustment:
*
* The maximum number of nanoseconds per frame that time offset may be
* adjusted with. This is used to avoid sudden large changes to time stamps.
*/
g_object_class_install_property (gobject_class, PROP_MAX_TS_OFFSET_ADJUSTMENT,
g_param_spec_uint64 ("max-ts-offset-adjustment",
"Max Timestamp Offset Adjustment",
"The maximum number of nanoseconds per frame that time stamp "
"offsets may be adjusted (0 = no limit).", 0, G_MAXUINT64,
DEFAULT_MAX_TS_OFFSET_ADJUSTMENT, G_PARAM_READWRITE |
G_PARAM_STATIC_STRINGS));
/**
* GstRtpJitterBuffer:do-lost:
*
@ -980,6 +998,8 @@ gst_rtp_jitter_buffer_init (GstRtpJitterBuffer * jitterbuffer)
priv->latency_ms = DEFAULT_LATENCY_MS;
priv->latency_ns = priv->latency_ms * GST_MSECOND;
priv->drop_on_latency = DEFAULT_DROP_ON_LATENCY;
priv->ts_offset = DEFAULT_TS_OFFSET;
priv->max_ts_offset_adjustment = DEFAULT_MAX_TS_OFFSET_ADJUSTMENT;
priv->do_lost = DEFAULT_DO_LOST;
priv->do_retransmission = DEFAULT_DO_RETRANSMISSION;
priv->rtx_next_seqnum = DEFAULT_RTX_NEXT_SEQNUM;
@ -997,7 +1017,9 @@ gst_rtp_jitter_buffer_init (GstRtpJitterBuffer * jitterbuffer)
priv->max_misorder_time = DEFAULT_MAX_MISORDER_TIME;
priv->faststart_min_packets = DEFAULT_FASTSTART_MIN_PACKETS;
priv->ts_offset_remainder = 0;
priv->last_dts = -1;
priv->last_pts = -1;
priv->last_rtptime = -1;
priv->avg_jitter = 0;
priv->timers = g_array_new (FALSE, TRUE, sizeof (TimerData));
@ -1571,7 +1593,7 @@ gst_rtp_jitter_buffer_flush_stop (GstRtpJitterBuffer * jitterbuffer)
priv->srcresult = GST_FLOW_OK;
gst_segment_init (&priv->segment, GST_FORMAT_TIME);
priv->last_popped_seqnum = -1;
priv->last_out_time = -1;
priv->last_out_time = GST_CLOCK_TIME_NONE;
priv->next_seqnum = -1;
priv->seqnum_base = -1;
priv->ips_rtptime = -1;
@ -1990,6 +2012,32 @@ check_buffering_percent (GstRtpJitterBuffer * jitterbuffer, gint percent)
return message;
}
static void
update_offset (GstRtpJitterBuffer * jitterbuffer)
{
GstRtpJitterBufferPrivate *priv;
priv = jitterbuffer->priv;
if (priv->ts_offset_remainder != 0) {
GST_DEBUG ("adjustment %" G_GUINT64_FORMAT " remain %" G_GINT64_FORMAT
" off %" G_GINT64_FORMAT, priv->max_ts_offset_adjustment,
priv->ts_offset_remainder, priv->ts_offset);
if (ABS (priv->ts_offset_remainder) > priv->max_ts_offset_adjustment) {
if (priv->ts_offset_remainder > 0) {
priv->ts_offset += priv->max_ts_offset_adjustment;
priv->ts_offset_remainder -= priv->max_ts_offset_adjustment;
} else {
priv->ts_offset -= priv->max_ts_offset_adjustment;
priv->ts_offset_remainder += priv->max_ts_offset_adjustment;
}
} else {
priv->ts_offset += priv->ts_offset_remainder;
priv->ts_offset_remainder = 0;
}
}
}
static GstClockTime
apply_offset (GstRtpJitterBuffer * jitterbuffer, GstClockTime timestamp)
{
@ -3388,6 +3436,11 @@ pop_and_push_next (GstRtpJitterBuffer * jitterbuffer, guint seqnum)
gst_segment_position_from_running_time (&priv->segment,
GST_FORMAT_TIME, item->pts);
/* if this is a new frame, check if ts_offset needs to be updated */
if (pts != priv->last_pts) {
update_offset (jitterbuffer);
}
/* apply timestamp with offset to buffer now */
GST_BUFFER_DTS (outbuf) = apply_offset (jitterbuffer, dts);
GST_BUFFER_PTS (outbuf) = apply_offset (jitterbuffer, pts);
@ -3395,6 +3448,20 @@ pop_and_push_next (GstRtpJitterBuffer * jitterbuffer, guint seqnum)
/* update the elapsed time when we need to check against the npt stop time. */
update_estimated_eos (jitterbuffer, item);
/* verify that an offset has not caused time stamps to go backwards, if so
* handle by reusing the previous timestamp */
if (priv->last_out_time != GST_CLOCK_TIME_NONE &&
GST_BUFFER_PTS (outbuf) < priv->last_out_time) {
GST_DEBUG_OBJECT (jitterbuffer, "buffer PTS %" GST_TIME_FORMAT
" older than preceding PTS %" GST_TIME_FORMAT
" adjusting to %" GST_TIME_FORMAT,
GST_TIME_ARGS (GST_BUFFER_PTS (outbuf)),
GST_TIME_ARGS (priv->last_out_time),
GST_TIME_ARGS (priv->last_out_time));
GST_BUFFER_PTS (outbuf) = priv->last_out_time;
}
priv->last_pts = pts;
priv->last_out_time = GST_BUFFER_PTS (outbuf);
break;
case ITEM_TYPE_LOST:
@ -4480,10 +4547,26 @@ gst_rtp_jitter_buffer_set_property (GObject * object,
break;
case PROP_TS_OFFSET:
JBUF_LOCK (priv);
priv->ts_offset = g_value_get_int64 (value);
if (priv->max_ts_offset_adjustment != 0) {
gint64 new_offset = g_value_get_int64 (value);
if (new_offset > priv->ts_offset) {
priv->ts_offset_remainder = new_offset - priv->ts_offset;
} else {
priv->ts_offset_remainder = -(priv->ts_offset - new_offset);
}
} else {
priv->ts_offset = g_value_get_int64 (value);
priv->ts_offset_remainder = 0;
}
priv->ts_discont = TRUE;
JBUF_UNLOCK (priv);
break;
case PROP_MAX_TS_OFFSET_ADJUSTMENT:
JBUF_LOCK (priv);
priv->max_ts_offset_adjustment = g_value_get_uint64 (value);
JBUF_UNLOCK (priv);
break;
case PROP_DO_LOST:
JBUF_LOCK (priv);
priv->do_lost = g_value_get_boolean (value);
@ -4607,6 +4690,11 @@ gst_rtp_jitter_buffer_get_property (GObject * object,
g_value_set_int64 (value, priv->ts_offset);
JBUF_UNLOCK (priv);
break;
case PROP_MAX_TS_OFFSET_ADJUSTMENT:
JBUF_LOCK (priv);
g_value_set_uint64 (value, priv->max_ts_offset_adjustment);
JBUF_UNLOCK (priv);
break;
case PROP_DO_LOST:
JBUF_LOCK (priv);
g_value_set_boolean (value, priv->do_lost);

3
gst/rtpmanager/rtpsource.c
View file

@ -1280,7 +1280,8 @@ rtp_source_send_rtp (RTPSource * src, RTPPacketInfo * pinfo)
return GST_FLOW_OK;
if (src->pt_set && src->pt != pinfo->pt) {
GST_WARNING ("Changing pt from %u to %u for SSRC %u", src->pt, pinfo->pt, src->ssrc);
GST_WARNING ("Changing pt from %u to %u for SSRC %u", src->pt, pinfo->pt,
src->ssrc);
}
src->pt = pinfo->pt;

32
gst/rtsp/gstrtspsrc.c
View file

@ -228,6 +228,7 @@ gst_rtsp_src_ntp_time_source_get_type (void)
#define DEFAULT_USER_AGENT "GStreamer/" PACKAGE_VERSION
#define DEFAULT_MAX_RTCP_RTP_TIME_DIFF 1000
#define DEFAULT_RFC7273_SYNC FALSE
#define DEFAULT_MAX_TS_OFFSET_ADJUSTMENT 0
enum
{
@ -267,7 +268,8 @@ enum
PROP_NTP_TIME_SOURCE,
PROP_USER_AGENT,
PROP_MAX_RTCP_RTP_TIME_DIFF,
PROP_RFC7273_SYNC
PROP_RFC7273_SYNC,
PROP_MAX_TS_OFFSET_ADJUSTMENT
};
#define GST_TYPE_RTSP_NAT_METHOD (gst_rtsp_nat_method_get_type())
@ -748,6 +750,22 @@ gst_rtspsrc_class_init (GstRTSPSrcClass * klass)
"(requires clock and offset to be provided)", DEFAULT_RFC7273_SYNC,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstRTSPSrc:max-ts-offset-adjustment:
*
* Syncing time stamps to NTP time adds a time offset. This parameter
* specifies the maximum number of nanoseconds per frame that this time offset
* may be adjusted with. This is used to avoid sudden large changes to time
* stamps.
*/
g_object_class_install_property (gobject_class, PROP_MAX_TS_OFFSET_ADJUSTMENT,
g_param_spec_uint64 ("max-ts-offset-adjustment",
"Max Timestamp Offset Adjustment",
"The maximum number of nanoseconds per frame that time stamp offsets "
"may be adjusted (0 = no limit).", 0, G_MAXUINT64,
DEFAULT_MAX_TS_OFFSET_ADJUSTMENT, G_PARAM_READWRITE |
G_PARAM_STATIC_STRINGS));
/**
* GstRTSPSrc::handle-request:
* @rtspsrc: a #GstRTSPSrc
@ -896,6 +914,7 @@ gst_rtspsrc_init (GstRTSPSrc * src)
src->user_agent = g_strdup (DEFAULT_USER_AGENT);
src->max_rtcp_rtp_time_diff = DEFAULT_MAX_RTCP_RTP_TIME_DIFF;
src->rfc7273_sync = DEFAULT_RFC7273_SYNC;
src->max_ts_offset_adjustment = DEFAULT_MAX_TS_OFFSET_ADJUSTMENT;
/* get a list of all extensions */
src->extensions = gst_rtsp_ext_list_get ();
@ -1186,6 +1205,9 @@ gst_rtspsrc_set_property (GObject * object, guint prop_id, const GValue * value,
case PROP_RFC7273_SYNC:
rtspsrc->rfc7273_sync = g_value_get_boolean (value);
break;
case PROP_MAX_TS_OFFSET_ADJUSTMENT:
rtspsrc->max_ts_offset_adjustment = g_value_get_uint64 (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
@ -1335,6 +1357,9 @@ gst_rtspsrc_get_property (GObject * object, guint prop_id, GValue * value,
case PROP_RFC7273_SYNC:
g_value_set_boolean (value, rtspsrc->rfc7273_sync);
break;
case PROP_MAX_TS_OFFSET_ADJUSTMENT:
g_value_set_uint64 (value, rtspsrc->max_ts_offset_adjustment);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
@ -3166,6 +3191,11 @@ gst_rtspsrc_stream_configure_manager (GstRTSPSrc * src, GstRTSPStream * stream,
src->max_rtcp_rtp_time_diff, NULL);
}
if (g_object_class_find_property (klass, "max-ts-offset-adjustment")) {
g_object_set (src->manager, "max-ts-offset-adjustment",
src->max_ts_offset_adjustment, NULL);
}
/* buffer mode pauses are handled by adding offsets to buffer times,
* but some depayloaders may have a hard time syncing output times
* with such input times, e.g. container ones, most notably ASF */

1
gst/rtsp/gstrtspsrc.h
View file

@ -250,6 +250,7 @@ struct _GstRTSPSrc {
gchar *user_agent;
GstClockTime max_rtcp_rtp_time_diff;
gboolean rfc7273_sync;
guint64 max_ts_offset_adjustment;
/* state */
GstRTSPState state;