From d5e257afd107a0cb0cde21f42a860ecef6d6795a Mon Sep 17 00:00:00 2001 From: Danny Smith Date: Tue, 29 May 2018 16:24:02 +0200 Subject: [PATCH] rtpbin: added option for setting min_ts_offset in ntp-sync mode Constantly updating the ts_offset results in audiable glitches when streaming audio using ntp-sync=true. By requiring a minimum offset before updating ts_offset this can be mitigated. Added a parameter which can be used to set min_ts_offset in ntp-sync mode. Part-of: --- .../gst-plugins-good/docs/gst_plugins_cache.json | 14 +++++++ .../gst-plugins-good/gst/rtpmanager/gstrtpbin.c | 48 ++++++++++++++++++++-- .../gst-plugins-good/gst/rtpmanager/gstrtpbin.h | 2 + 3 files changed, 60 insertions(+), 4 deletions(-) diff --git a/subprojects/gst-plugins-good/docs/gst_plugins_cache.json b/subprojects/gst-plugins-good/docs/gst_plugins_cache.json index 7388465..ac1819a 100644 --- a/subprojects/gst-plugins-good/docs/gst_plugins_cache.json +++ b/subprojects/gst-plugins-good/docs/gst_plugins_cache.json @@ -16807,6 +16807,20 @@ "type": "guint64", "writable": true }, + "min-ts-offset": { + "blurb": "The minimum absolute value of the time offset in (nanoseconds). Used to set an lower limit for when a time offset is deemed large enough to be useful for sync corrections.Note, if the ntp-sync parameter is set the default value is changed to 0 (no limit)", + "conditionally-available": false, + "construct": false, + "construct-only": false, + "controllable": false, + "default": "4000000", + "max": "18446744073709551615", + "min": "0", + "mutable": "null", + "readable": true, + "type": "guint64", + "writable": true + }, "ntp-sync": { "blurb": "Synchronize received streams to the NTP clock", "conditionally-available": false, diff --git a/subprojects/gst-plugins-good/gst/rtpmanager/gstrtpbin.c b/subprojects/gst-plugins-good/gst/rtpmanager/gstrtpbin.c index 1713d18..5c3359f 100644 --- a/subprojects/gst-plugins-good/gst/rtpmanager/gstrtpbin.c +++ b/subprojects/gst-plugins-good/gst/rtpmanager/gstrtpbin.c @@ -260,7 +260,7 @@ G_STMT_START { \ /* Minimum time offset to apply. This compensates for rounding errors in NTP to * RTP timestamp conversions */ -#define MIN_TS_OFFSET (4 * GST_MSECOND) +#define MIN_TS_OFFSET_ROUND_OFF_COMP (4 * GST_MSECOND) struct _GstRtpBinPrivate { @@ -353,6 +353,7 @@ enum #define DEFAULT_MAX_STREAMS G_MAXUINT #define DEFAULT_MAX_TS_OFFSET_ADJUSTMENT G_GUINT64_CONSTANT(0) #define DEFAULT_MAX_TS_OFFSET G_GINT64_CONSTANT(3000000000) +#define DEFAULT_MIN_TS_OFFSET MIN_TS_OFFSET_ROUND_OFF_COMP enum { @@ -380,6 +381,7 @@ enum PROP_MAX_STREAMS, PROP_MAX_TS_OFFSET_ADJUSTMENT, PROP_MAX_TS_OFFSET, + PROP_MIN_TS_OFFSET, PROP_FEC_DECODERS, PROP_FEC_ENCODERS, }; @@ -1327,7 +1329,7 @@ get_current_times (GstRtpBin * bin, GstClockTime * running_time, static void stream_set_ts_offset (GstRtpBin * bin, GstRtpBinStream * stream, - gint64 ts_offset, gint64 max_ts_offset, gint64 min_ts_offset, + gint64 ts_offset, gint64 max_ts_offset, guint64 min_ts_offset, gboolean allow_positive_ts_offset) { gint64 prev_ts_offset; @@ -1513,7 +1515,7 @@ gst_rtp_bin_associate (GstRtpBin * bin, GstRtpBinStream * stream, guint8 len, stream->rt_delta = rtdiff - ntpdiff; stream_set_ts_offset (bin, stream, stream->rt_delta, bin->max_ts_offset, - 0, FALSE); + bin->min_ts_offset, FALSE); } else { gint64 min, rtp_min, clock_base = stream->clock_base; gboolean all_sync, use_rtp; @@ -1666,7 +1668,7 @@ gst_rtp_bin_associate (GstRtpBin * bin, GstRtpBinStream * stream, guint8 len, ts_offset = ostream->rt_delta - min; stream_set_ts_offset (bin, ostream, ts_offset, bin->max_ts_offset, - MIN_TS_OFFSET, TRUE); + bin->min_ts_offset, TRUE); } } gst_rtp_bin_send_sync_event (stream); @@ -2762,6 +2764,28 @@ gst_rtp_bin_class_init (GstRtpBinClass * klass) G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); /** + * GstRtpBin:min-ts-offset: + * + * Used to set an lower limit for when a time offset is deemed large enough + * to be useful for sync corrections. + * + * When streaming for instance audio, even very small ts_offsets cause + * audible glitches. This property is used for controlling how sensitive the + * adjustments should be to small deviations in ts_offset, occurring for + * instance due to jittery network conditions or system load. + * + * Since: 1.22 + */ + g_object_class_install_property (gobject_class, PROP_MIN_TS_OFFSET, + g_param_spec_uint64 ("min-ts-offset", "Min TS Offset", + "The minimum absolute value of the time offset in (nanoseconds). " + "Used to set an lower limit for when a time offset is deemed large " + "enough to be useful for sync corrections." + "Note, if the ntp-sync parameter is set the default value is " + "changed to 0 (no limit)", 0, G_MAXUINT64, DEFAULT_MIN_TS_OFFSET, + G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); + + /** * GstRtpBin:fec-decoders: * * Used to provide a factory used to build the FEC decoder for a @@ -2883,6 +2907,8 @@ gst_rtp_bin_init (GstRtpBin * rtpbin) rtpbin->max_ts_offset_adjustment = DEFAULT_MAX_TS_OFFSET_ADJUSTMENT; rtpbin->max_ts_offset = DEFAULT_MAX_TS_OFFSET; rtpbin->max_ts_offset_is_set = FALSE; + rtpbin->min_ts_offset = DEFAULT_MIN_TS_OFFSET; + rtpbin->min_ts_offset_is_set = FALSE; /* some default SDES entries */ cname = g_strdup_printf ("user%u@host-%x", g_random_int (), g_random_int ()); @@ -3079,6 +3105,13 @@ gst_rtp_bin_set_property (GObject * object, guint prop_id, rtpbin->max_ts_offset = DEFAULT_MAX_TS_OFFSET; } } + if (!rtpbin->min_ts_offset_is_set) { + if (rtpbin->ntp_sync) { + rtpbin->min_ts_offset = 0; + } else { + rtpbin->min_ts_offset = DEFAULT_MIN_TS_OFFSET; + } + } break; case PROP_RTCP_SYNC: g_atomic_int_set (&rtpbin->rtcp_sync, g_value_get_enum (value)); @@ -3197,6 +3230,10 @@ gst_rtp_bin_set_property (GObject * object, guint prop_id, rtpbin->max_ts_offset = g_value_get_int64 (value); rtpbin->max_ts_offset_is_set = TRUE; break; + case PROP_MIN_TS_OFFSET: + rtpbin->min_ts_offset = g_value_get_uint64 (value); + rtpbin->min_ts_offset_is_set = TRUE; + break; case PROP_FEC_DECODERS: gst_rtp_bin_set_fec_decoders_struct (rtpbin, g_value_get_boxed (value)); break; @@ -3297,6 +3334,9 @@ gst_rtp_bin_get_property (GObject * object, guint prop_id, case PROP_MAX_TS_OFFSET: g_value_set_int64 (value, rtpbin->max_ts_offset); break; + case PROP_MIN_TS_OFFSET: + g_value_set_uint64 (value, rtpbin->min_ts_offset); + break; case PROP_FEC_DECODERS: g_value_take_boxed (value, gst_rtp_bin_get_fec_decoders_struct (rtpbin)); break; diff --git a/subprojects/gst-plugins-good/gst/rtpmanager/gstrtpbin.h b/subprojects/gst-plugins-good/gst/rtpmanager/gstrtpbin.h index 28c8d2b..a53dede 100644 --- a/subprojects/gst-plugins-good/gst/rtpmanager/gstrtpbin.h +++ b/subprojects/gst-plugins-good/gst/rtpmanager/gstrtpbin.h @@ -78,6 +78,8 @@ struct _GstRtpBin { guint64 max_ts_offset_adjustment; gint64 max_ts_offset; gboolean max_ts_offset_is_set; + guint64 min_ts_offset; + gboolean min_ts_offset_is_set; /* a list of session */ GSList *sessions; -- 2.7.4