gstreamer/gst/netsim/gstnetsim.c

473 lines
15 KiB
C
Raw Normal View History

/*
* GStreamer
*
* Copyright 2006 Collabora Ltd,
* Copyright 2006 Nokia Corporation
* @author: Philippe Kalaf <philippe.kalaf@collabora.co.uk>.
* Copyright 2012-2015 Pexip
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include "gstnetsim.h"
GST_DEBUG_CATEGORY (netsim_debug);
#define GST_CAT_DEFAULT (netsim_debug)
enum
{
ARG_0,
ARG_MIN_DELAY,
ARG_MAX_DELAY,
ARG_DELAY_PROBABILITY,
ARG_DROP_PROBABILITY,
ARG_DUPLICATE_PROBABILITY,
ARG_DROP_PACKETS
};
struct _GstNetSimPrivate
{
GstPad *sinkpad, *srcpad;
GMutex loop_mutex;
GCond start_cond;
GMainLoop *main_loop;
gboolean running;
GRand *rand_seed;
gint min_delay;
gint max_delay;
gfloat delay_probability;
gfloat drop_probability;
gfloat duplicate_probability;
guint drop_packets;
};
/* these numbers are nothing but wild guesses and dont reflect any reality */
#define DEFAULT_MIN_DELAY 200
#define DEFAULT_MAX_DELAY 400
#define DEFAULT_DELAY_PROBABILITY 0.0
#define DEFAULT_DROP_PROBABILITY 0.0
#define DEFAULT_DUPLICATE_PROBABILITY 0.0
#define DEFAULT_DROP_PACKETS 0
#define GST_NET_SIM_GET_PRIVATE(o) \
(G_TYPE_INSTANCE_GET_PRIVATE ((o), GST_TYPE_NET_SIM, \
GstNetSimPrivate))
static GstStaticPadTemplate gst_net_sim_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
static GstStaticPadTemplate gst_net_sim_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
G_DEFINE_TYPE (GstNetSim, gst_net_sim, GST_TYPE_ELEMENT);
static void
gst_net_sim_loop (GstNetSim * netsim)
{
GMainLoop *loop;
GST_TRACE_OBJECT (netsim, "TASK: begin");
g_mutex_lock (&netsim->priv->loop_mutex);
loop = g_main_loop_ref (netsim->priv->main_loop);
netsim->priv->running = TRUE;
GST_TRACE_OBJECT (netsim, "TASK: signal start");
g_cond_signal (&netsim->priv->start_cond);
g_mutex_unlock (&netsim->priv->loop_mutex);
GST_TRACE_OBJECT (netsim, "TASK: run");
g_main_loop_run (loop);
g_main_loop_unref (loop);
g_mutex_lock (&netsim->priv->loop_mutex);
GST_TRACE_OBJECT (netsim, "TASK: pause");
gst_pad_pause_task (netsim->priv->srcpad);
netsim->priv->running = FALSE;
GST_TRACE_OBJECT (netsim, "TASK: signal end");
g_cond_signal (&netsim->priv->start_cond);
g_mutex_unlock (&netsim->priv->loop_mutex);
GST_TRACE_OBJECT (netsim, "TASK: end");
}
static gboolean
_main_loop_quit_and_remove_source (gpointer user_data)
{
GMainLoop *main_loop = user_data;
GST_DEBUG ("MAINLOOP: Quit %p", main_loop);
g_main_loop_quit (main_loop);
g_assert (!g_main_loop_is_running (main_loop));
return FALSE; /* Remove source */
}
static gboolean
gst_net_sim_src_activatemode (GstPad * pad, GstObject * parent,
GstPadMode mode, gboolean active)
{
GstNetSim *netsim = GST_NET_SIM (parent);
gboolean result = FALSE;
(void) pad;
(void) mode;
g_mutex_lock (&netsim->priv->loop_mutex);
if (active) {
if (netsim->priv->main_loop == NULL) {
GMainContext *main_context = g_main_context_new ();
netsim->priv->main_loop = g_main_loop_new (main_context, FALSE);
g_main_context_unref (main_context);
GST_TRACE_OBJECT (netsim, "ACT: Starting task on srcpad");
result = gst_pad_start_task (netsim->priv->srcpad,
(GstTaskFunction) gst_net_sim_loop, netsim, NULL);
GST_TRACE_OBJECT (netsim, "ACT: Wait for task to start");
g_assert (!netsim->priv->running);
while (!netsim->priv->running)
g_cond_wait (&netsim->priv->start_cond, &netsim->priv->loop_mutex);
GST_TRACE_OBJECT (netsim, "ACT: Task on srcpad started");
}
} else {
if (netsim->priv->main_loop != NULL) {
GSource *source;
guint id;
/* Adds an Idle Source which quits the main loop from within.
* This removes the possibility for run/quit race conditions. */
GST_TRACE_OBJECT (netsim, "DEACT: Stopping main loop on deactivate");
source = g_idle_source_new ();
g_source_set_callback (source, _main_loop_quit_and_remove_source,
g_main_loop_ref (netsim->priv->main_loop),
(GDestroyNotify) g_main_loop_unref);
id = g_source_attach (source,
g_main_loop_get_context (netsim->priv->main_loop));
g_source_unref (source);
g_assert_cmpuint (id, >, 0);
g_main_loop_unref (netsim->priv->main_loop);
netsim->priv->main_loop = NULL;
GST_TRACE_OBJECT (netsim, "DEACT: Wait for mainloop and task to pause");
g_assert (netsim->priv->running);
while (netsim->priv->running)
g_cond_wait (&netsim->priv->start_cond, &netsim->priv->loop_mutex);
GST_TRACE_OBJECT (netsim, "DEACT: Stopping task on srcpad");
result = gst_pad_stop_task (netsim->priv->srcpad);
GST_TRACE_OBJECT (netsim, "DEACT: Mainloop and GstTask stopped");
}
}
g_mutex_unlock (&netsim->priv->loop_mutex);
return result;
}
typedef struct
{
GstPad *pad;
GstBuffer *buf;
} PushBufferCtx;
G_INLINE_FUNC PushBufferCtx *
push_buffer_ctx_new (GstPad * pad, GstBuffer * buf)
{
PushBufferCtx *ctx = g_slice_new (PushBufferCtx);
ctx->pad = gst_object_ref (pad);
ctx->buf = gst_buffer_ref (buf);
return ctx;
}
G_INLINE_FUNC void
push_buffer_ctx_free (PushBufferCtx * ctx)
{
if (G_LIKELY (ctx != NULL)) {
gst_buffer_unref (ctx->buf);
gst_object_unref (ctx->pad);
g_slice_free (PushBufferCtx, ctx);
}
}
static gboolean
push_buffer_ctx_push (PushBufferCtx * ctx)
{
GST_DEBUG_OBJECT (ctx->pad, "Pushing buffer now");
gst_pad_push (ctx->pad, gst_buffer_ref (ctx->buf));
return FALSE;
}
static GstFlowReturn
gst_net_sim_delay_buffer (GstNetSim * netsim, GstBuffer * buf)
{
GstFlowReturn ret = GST_FLOW_OK;
g_mutex_lock (&netsim->priv->loop_mutex);
if (netsim->priv->main_loop != NULL && netsim->priv->delay_probability > 0 &&
g_rand_double (netsim->priv->rand_seed) < netsim->priv->delay_probability)
{
PushBufferCtx *ctx = push_buffer_ctx_new (netsim->priv->srcpad, buf);
gint delay = g_rand_int_range (netsim->priv->rand_seed,
netsim->priv->min_delay, netsim->priv->max_delay);
GSource *source = g_timeout_source_new (delay);
GST_DEBUG_OBJECT (netsim, "Delaying packet by %d", delay);
g_source_set_callback (source, (GSourceFunc) push_buffer_ctx_push,
ctx, (GDestroyNotify) push_buffer_ctx_free);
g_source_attach (source, g_main_loop_get_context (netsim->priv->main_loop));
g_source_unref (source);
} else {
ret = gst_pad_push (netsim->priv->srcpad, gst_buffer_ref (buf));
}
g_mutex_unlock (&netsim->priv->loop_mutex);
return ret;
}
static GstFlowReturn
gst_net_sim_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
{
GstNetSim *netsim = GST_NET_SIM (parent);
GstFlowReturn ret = GST_FLOW_OK;
(void) pad;
if (netsim->priv->drop_packets > 0) {
netsim->priv->drop_packets--;
GST_DEBUG_OBJECT (netsim, "Dropping packet (%d left)",
netsim->priv->drop_packets);
} else if (netsim->priv->drop_probability > 0
&& g_rand_double (netsim->priv->rand_seed) <
(gdouble) netsim->priv->drop_probability) {
GST_DEBUG_OBJECT (netsim, "Dropping packet");
} else if (netsim->priv->duplicate_probability > 0 &&
g_rand_double (netsim->priv->rand_seed) <
(gdouble) netsim->priv->duplicate_probability) {
GST_DEBUG_OBJECT (netsim, "Duplicating packet");
gst_net_sim_delay_buffer (netsim, buf);
ret = gst_net_sim_delay_buffer (netsim, buf);
} else {
ret = gst_net_sim_delay_buffer (netsim, buf);
}
gst_buffer_unref (buf);
return ret;
}
static void
gst_net_sim_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec)
{
GstNetSim *netsim = GST_NET_SIM (object);
switch (prop_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
case ARG_MIN_DELAY:
netsim->priv->min_delay = g_value_get_int (value);
break;
case ARG_MAX_DELAY:
netsim->priv->max_delay = g_value_get_int (value);
break;
case ARG_DELAY_PROBABILITY:
netsim->priv->delay_probability = g_value_get_float (value);
break;
case ARG_DROP_PROBABILITY:
netsim->priv->drop_probability = g_value_get_float (value);
break;
case ARG_DUPLICATE_PROBABILITY:
netsim->priv->duplicate_probability = g_value_get_float (value);
break;
case ARG_DROP_PACKETS:
netsim->priv->drop_packets = g_value_get_uint (value);
break;
}
}
static void
gst_net_sim_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec)
{
GstNetSim *netsim = GST_NET_SIM (object);
switch (prop_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
case ARG_MIN_DELAY:
g_value_set_int (value, netsim->priv->min_delay);
break;
case ARG_MAX_DELAY:
g_value_set_int (value, netsim->priv->max_delay);
break;
case ARG_DELAY_PROBABILITY:
g_value_set_float (value, netsim->priv->delay_probability);
break;
case ARG_DROP_PROBABILITY:
g_value_set_float (value, netsim->priv->drop_probability);
break;
case ARG_DUPLICATE_PROBABILITY:
g_value_set_float (value, netsim->priv->duplicate_probability);
break;
case ARG_DROP_PACKETS:
g_value_set_uint (value, netsim->priv->drop_packets);
break;
}
}
static void
gst_net_sim_init (GstNetSim * netsim)
{
netsim->priv = GST_NET_SIM_GET_PRIVATE (netsim);
netsim->priv->srcpad =
gst_pad_new_from_static_template (&gst_net_sim_src_template, "src");
netsim->priv->sinkpad =
gst_pad_new_from_static_template (&gst_net_sim_sink_template, "sink");
gst_element_add_pad (GST_ELEMENT (netsim), netsim->priv->srcpad);
gst_element_add_pad (GST_ELEMENT (netsim), netsim->priv->sinkpad);
g_mutex_init (&netsim->priv->loop_mutex);
g_cond_init (&netsim->priv->start_cond);
netsim->priv->rand_seed = g_rand_new ();
netsim->priv->main_loop = NULL;
GST_OBJECT_FLAG_SET (netsim->priv->sinkpad,
GST_PAD_FLAG_PROXY_CAPS | GST_PAD_FLAG_PROXY_ALLOCATION);
gst_pad_set_chain_function (netsim->priv->sinkpad,
GST_DEBUG_FUNCPTR (gst_net_sim_chain));
gst_pad_set_activatemode_function (netsim->priv->srcpad,
GST_DEBUG_FUNCPTR (gst_net_sim_src_activatemode));
}
static void
gst_net_sim_finalize (GObject * object)
{
GstNetSim *netsim = GST_NET_SIM (object);
g_rand_free (netsim->priv->rand_seed);
g_mutex_clear (&netsim->priv->loop_mutex);
g_cond_clear (&netsim->priv->start_cond);
G_OBJECT_CLASS (gst_net_sim_parent_class)->finalize (object);
}
static void
gst_net_sim_dispose (GObject * object)
{
GstNetSim *netsim = GST_NET_SIM (object);
g_assert (netsim->priv->main_loop == NULL);
G_OBJECT_CLASS (gst_net_sim_parent_class)->dispose (object);
}
static void
gst_net_sim_class_init (GstNetSimClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
g_type_class_add_private (klass, sizeof (GstNetSimPrivate));
gst_element_class_add_static_pad_template (gstelement_class,
&gst_net_sim_src_template);
gst_element_class_add_static_pad_template (gstelement_class,
&gst_net_sim_sink_template);
gst_element_class_set_metadata (gstelement_class,
"Network Simulator",
"Filter/Network",
"An element that simulates network jitter, "
"packet loss and packet duplication",
"Philippe Kalaf <philippe.kalaf@collabora.co.uk>");
gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_net_sim_dispose);
gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_net_sim_finalize);
gobject_class->set_property = gst_net_sim_set_property;
gobject_class->get_property = gst_net_sim_get_property;
g_object_class_install_property (gobject_class, ARG_MIN_DELAY,
g_param_spec_int ("min-delay", "Minimum delay (ms)",
"The minimum delay in ms to apply to buffers",
G_MININT, G_MAXINT, DEFAULT_MIN_DELAY,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, ARG_MAX_DELAY,
g_param_spec_int ("max-delay", "Maximum delay (ms)",
"The maximum delay in ms to apply to buffers",
G_MININT, G_MAXINT, DEFAULT_MAX_DELAY,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, ARG_DELAY_PROBABILITY,
g_param_spec_float ("delay-probability", "Delay Probability",
"The Probability a buffer is delayed",
0.0, 1.0, DEFAULT_DELAY_PROBABILITY,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, ARG_DROP_PROBABILITY,
g_param_spec_float ("drop-probability", "Drop Probability",
"The Probability a buffer is dropped",
0.0, 1.0, DEFAULT_DROP_PROBABILITY,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, ARG_DUPLICATE_PROBABILITY,
g_param_spec_float ("duplicate-probability", "Duplicate Probability",
"The Probability a buffer is duplicated",
0.0, 1.0, DEFAULT_DUPLICATE_PROBABILITY,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, ARG_DROP_PACKETS,
g_param_spec_uint ("drop-packets", "Drop Packets",
"Drop the next n packets",
0, G_MAXUINT, DEFAULT_DROP_PACKETS,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
GST_DEBUG_CATEGORY_INIT (netsim_debug, "netsim", 0, "Network simulator");
}
static gboolean
gst_net_sim_plugin_init (GstPlugin * plugin)
{
return gst_element_register (plugin, "netsim",
GST_RANK_MARGINAL, GST_TYPE_NET_SIM);
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
netsim,
"Network Simulator",
gst_net_sim_plugin_init, PACKAGE_VERSION, "LGPL", GST_PACKAGE_NAME,
GST_PACKAGE_ORIGIN)