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netsim: add "allow-reordering" property
Reordering of packets is not very common in networks, and the delay functions will always introduce reordering if delay > packet-spacing, so by setting allow-reordering to FALSE you guarantee that the packets are in order, while at the same time introducing delay/jitter to them.
This commit is contained in:
Havard Graff
Tim-Philipp Müller
parent
c9002e3dd5
commit
b8b4124c8b
2 changed files with 52 additions and 3 deletions
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@ -65,6 +65,7 @@ enum
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PROP_DROP_PACKETS,
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PROP_MAX_KBPS,
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PROP_MAX_BUCKET_SIZE,
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PROP_ALLOW_REORDERING,
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};
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/* these numbers are nothing but wild guesses and dont reflect any reality */
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@ -77,6 +78,7 @@ enum
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#define DEFAULT_DROP_PACKETS 0
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#define DEFAULT_MAX_KBPS -1
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#define DEFAULT_MAX_BUCKET_SIZE -1
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#define DEFAULT_ALLOW_REORDERING TRUE
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static GstStaticPadTemplate gst_net_sim_sink_template =
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GST_STATIC_PAD_TEMPLATE ("sink",
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@ -92,6 +94,21 @@ GST_STATIC_PAD_TEMPLATE ("src",
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G_DEFINE_TYPE (GstNetSim, gst_net_sim, GST_TYPE_ELEMENT);
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static gboolean
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gst_net_sim_source_dispatch (GSource * source,
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GSourceFunc callback, gpointer user_data)
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{
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callback (user_data);
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return FALSE;
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}
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GSourceFuncs gst_net_sim_source_funcs = {
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NULL, /* prepare */
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NULL, /* check */
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gst_net_sim_source_dispatch,
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NULL /* finalize */
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};
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static void
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gst_net_sim_loop (GstNetSim * netsim)
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{
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@ -309,7 +326,6 @@ get_random_value_gamma (GRand * rand_seed, gint32 low, gint32 high,
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return round (x + low);
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}
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static GstFlowReturn
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gst_net_sim_delay_buffer (GstNetSim * netsim, GstBuffer * buf)
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{
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@ -321,6 +337,7 @@ gst_net_sim_delay_buffer (GstNetSim * netsim, GstBuffer * buf)
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gint delay;
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PushBufferCtx *ctx;
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GSource *source;
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gint64 ready_time;
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switch (netsim->delay_distribution) {
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case DISTRIBUTION_UNIFORM:
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@ -344,9 +361,17 @@ gst_net_sim_delay_buffer (GstNetSim * netsim, GstBuffer * buf)
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delay = 0;
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ctx = push_buffer_ctx_new (netsim->srcpad, buf);
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source = g_timeout_source_new (delay);
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GST_DEBUG_OBJECT (netsim, "Delaying packet by %d", delay);
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source = g_source_new (&gst_net_sim_source_funcs, sizeof (GSource));
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ready_time = g_get_monotonic_time () + delay * 1000;
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if (!netsim->allow_reordering && ready_time < netsim->last_ready_time)
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ready_time = netsim->last_ready_time + 1;
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GST_DEBUG_OBJECT (netsim, "Delaying packet by %ldms",
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(ready_time - netsim->last_ready_time) / 1000);
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netsim->last_ready_time = ready_time;
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g_source_set_ready_time (source, ready_time);
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g_source_set_callback (source, (GSourceFunc) push_buffer_ctx_push,
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ctx, (GDestroyNotify) push_buffer_ctx_free);
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g_source_attach (source, g_main_loop_get_context (netsim->main_loop));
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@ -518,6 +543,9 @@ gst_net_sim_set_property (GObject * object,
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if (netsim->max_bucket_size != -1)
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netsim->bucket_size = netsim->max_bucket_size * 1000;
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break;
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case PROP_ALLOW_REORDERING:
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netsim->allow_reordering = g_value_get_boolean (value);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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@ -558,6 +586,9 @@ gst_net_sim_get_property (GObject * object,
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case PROP_MAX_BUCKET_SIZE:
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g_value_set_int (value, netsim->max_bucket_size);
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break;
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case PROP_ALLOW_REORDERING:
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g_value_set_boolean (value, netsim->allow_reordering);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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@ -714,6 +745,22 @@ gst_net_sim_class_init (GstNetSimClass * klass)
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"(-1 = unlimited)", -1, G_MAXINT, DEFAULT_MAX_BUCKET_SIZE,
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G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
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/**
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* GstNetSim:allow-reordering:
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*
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* When delaying packets, are they allowed to be reordered or not. By
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* default this is enabled, but in the real world packet reordering is
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* fairly uncommon, yet the delay functions will always introduce reordering
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* if delay > packet-spacing, This property allows switching that off.
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*
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* Since: 1.14
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*/
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g_object_class_install_property (gobject_class, PROP_ALLOW_REORDERING,
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g_param_spec_boolean ("allow-reordering", "Allow Reordering",
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"When delaying packets, are they allowed to be reordered or not",
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DEFAULT_ALLOW_REORDERING,
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G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
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GST_DEBUG_CATEGORY_INIT (netsim_debug, "netsim", 0, "Network simulator");
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}
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@ -75,6 +75,7 @@ struct _GstNetSim
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gsize bucket_size;
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GstClockTime prev_time;
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NormalDistributionState delay_state;
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gint64 last_ready_time;
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/* properties */
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gint min_delay;
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@ -86,6 +87,7 @@ struct _GstNetSim
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guint drop_packets;
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gint max_kbps;
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gint max_bucket_size;
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gboolean allow_reordering;
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};
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struct _GstNetSimClass
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