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gstreamer/gst/liveadder/liveadder.c
David Schleef 159e2768d6 Fix pad template memleaks 
Pad templates returned by gst_static_pad_template_get() were not
being unreffed.
2010-11-30 18:54:46 -08:00

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/*
* Farsight Voice+Video library
*
* Copyright 2008 Collabora Ltd
* Copyright 2008 Nokia Corporation
* @author: Olivier Crete <olivier.crete@collabora.co.uk>
*
* With parts copied from the adder plugin which is
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2001 Thomas <thomas@apestaart.org>
* 2005,2006 Wim Taymans <wim@fluendo.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
/**
* SECTION:element-liveadder
* @see_also: adder
*
* The live adder allows to mix several streams into one by adding the data.
* Mixed data is clamped to the min/max values of the data format.
*
* Unlike the adder, the liveadder mixes the streams according the their
* timestamps and waits for some milli-seconds before trying doing the mixing.
*
* Last reviewed on 2008-02-10 (0.10.11)
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "liveadder.h"
#include <gst/audio/audio.h>
#include <string.h>
#define DEFAULT_LATENCY_MS 60
GST_DEBUG_CATEGORY_STATIC (live_adder_debug);
#define GST_CAT_DEFAULT (live_adder_debug)
static GstStaticPadTemplate gst_live_adder_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink%d",
GST_PAD_SINK,
GST_PAD_REQUEST,
GST_STATIC_CAPS (GST_AUDIO_INT_PAD_TEMPLATE_CAPS "; "
GST_AUDIO_FLOAT_PAD_TEMPLATE_CAPS)
);
static GstStaticPadTemplate gst_live_adder_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_AUDIO_INT_PAD_TEMPLATE_CAPS "; "
GST_AUDIO_FLOAT_PAD_TEMPLATE_CAPS)
);
/* Valve signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
PROP_0,
PROP_LATENCY,
};
typedef struct _GstLiveAdderPadPrivate
{
GstSegment segment;
gboolean eos;
GstClockTime expected_timestamp;
} GstLiveAdderPadPrivate;
#define _do_init(bla) \
GST_DEBUG_CATEGORY_INIT (live_adder_debug, "liveadder", 0, "Live Adder");
GST_BOILERPLATE_FULL (GstLiveAdder, gst_live_adder, GstElement,
GST_TYPE_ELEMENT, _do_init);
static void gst_live_adder_finalize (GObject * object);
static void
gst_live_adder_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec);
static void
gst_live_adder_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec);
static GstPad *gst_live_adder_request_new_pad (GstElement * element,
GstPadTemplate * templ, const gchar * unused);
static void gst_live_adder_release_pad (GstElement * element, GstPad * pad);
static GstStateChangeReturn
gst_live_adder_change_state (GstElement * element, GstStateChange transition);
static gboolean gst_live_adder_setcaps (GstPad * pad, GstCaps * caps);
static GstCaps *gst_live_adder_sink_getcaps (GstPad * pad);
static gboolean
gst_live_adder_src_activate_push (GstPad * pad, gboolean active);
static gboolean gst_live_adder_src_event (GstPad * pad, GstEvent * event);
static void gst_live_adder_loop (gpointer data);
static gboolean gst_live_adder_query (GstPad * pad, GstQuery * query);
static gboolean gst_live_adder_sink_event (GstPad * pad, GstEvent * event);
static void reset_pad_private (GstPad * pad);
/* clipping versions */
#define MAKE_FUNC(name,type,ttype,min,max) \
static void name (type *out, type *in, gint bytes) { \
gint i; \
for (i = 0; i < bytes / sizeof (type); i++) \
out[i] = CLAMP ((ttype)out[i] + (ttype)in[i], min, max); \
}
/* non-clipping versions (for float) */
#define MAKE_FUNC_NC(name,type,ttype) \
static void name (type *out, type *in, gint bytes) { \
gint i; \
for (i = 0; i < bytes / sizeof (type); i++) \
out[i] = (ttype)out[i] + (ttype)in[i]; \
}
/* *INDENT-OFF* */
MAKE_FUNC (add_int32, gint32, gint64, G_MININT32, G_MAXINT32)
MAKE_FUNC (add_int16, gint16, gint32, G_MININT16, G_MAXINT16)
MAKE_FUNC (add_int8, gint8, gint16, G_MININT8, G_MAXINT8)
MAKE_FUNC (add_uint32, guint32, guint64, 0, G_MAXUINT32)
MAKE_FUNC (add_uint16, guint16, guint32, 0, G_MAXUINT16)
MAKE_FUNC (add_uint8, guint8, guint16, 0, G_MAXUINT8)
MAKE_FUNC_NC (add_float64, gdouble, gdouble)
MAKE_FUNC_NC (add_float32, gfloat, gfloat)
/* *INDENT-ON* */
static void
gst_live_adder_base_init (gpointer klass)
{
GstElementClass *gstelement_class = (GstElementClass *) klass;
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_live_adder_src_template));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_live_adder_sink_template));
gst_element_class_set_details_simple (gstelement_class, "Live Adder element",
"Generic/Audio",
"Mixes live/discontinuous audio streams",
"Olivier Crete <olivier.crete@collabora.co.uk>");
}
static void
gst_live_adder_class_init (GstLiveAdderClass * klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
GstElementClass *gstelement_class = (GstElementClass *) klass;
gobject_class->finalize = gst_live_adder_finalize;
gobject_class->set_property = gst_live_adder_set_property;
gobject_class->get_property = gst_live_adder_get_property;
gstelement_class->request_new_pad = gst_live_adder_request_new_pad;
gstelement_class->release_pad = gst_live_adder_release_pad;
gstelement_class->change_state = gst_live_adder_change_state;
g_object_class_install_property (gobject_class, PROP_LATENCY,
g_param_spec_uint ("latency", "Buffer latency in ms",
"Amount of data to buffer", 0, G_MAXUINT, DEFAULT_LATENCY_MS,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
}
static void
gst_live_adder_init (GstLiveAdder * adder, GstLiveAdderClass * klass)
{
adder->srcpad =
gst_pad_new_from_static_template (&gst_live_adder_src_template, "src");
gst_pad_set_getcaps_function (adder->srcpad,
GST_DEBUG_FUNCPTR (gst_pad_proxy_getcaps));
gst_pad_set_setcaps_function (adder->srcpad,
GST_DEBUG_FUNCPTR (gst_live_adder_setcaps));
gst_pad_set_query_function (adder->srcpad,
GST_DEBUG_FUNCPTR (gst_live_adder_query));
gst_pad_set_event_function (adder->srcpad,
GST_DEBUG_FUNCPTR (gst_live_adder_src_event));
gst_pad_set_activatepush_function (adder->srcpad,
GST_DEBUG_FUNCPTR (gst_live_adder_src_activate_push));
gst_element_add_pad (GST_ELEMENT (adder), adder->srcpad);
adder->format = GST_LIVE_ADDER_FORMAT_UNSET;
adder->padcount = 0;
adder->func = NULL;
adder->not_empty_cond = g_cond_new ();
adder->next_timestamp = GST_CLOCK_TIME_NONE;
adder->latency_ms = DEFAULT_LATENCY_MS;
adder->buffers = g_queue_new ();
}
static void
gst_live_adder_finalize (GObject * object)
{
GstLiveAdder *adder = GST_LIVE_ADDER (object);
g_cond_free (adder->not_empty_cond);
g_queue_foreach (adder->buffers, (GFunc) gst_mini_object_unref, NULL);
while (g_queue_pop_head (adder->buffers)) {
}
g_queue_free (adder->buffers);
g_list_free (adder->sinkpads);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_live_adder_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec)
{
GstLiveAdder *adder = GST_LIVE_ADDER (object);
switch (prop_id) {
case PROP_LATENCY:
{
guint64 new_latency, old_latency;
new_latency = g_value_get_uint (value);
GST_OBJECT_LOCK (adder);
old_latency = adder->latency_ms;
adder->latency_ms = new_latency;
GST_OBJECT_UNLOCK (adder);
/* post message if latency changed, this will inform the parent pipeline
* that a latency reconfiguration is possible/needed. */
if (new_latency != old_latency) {
GST_DEBUG_OBJECT (adder, "latency changed to: %" GST_TIME_FORMAT,
GST_TIME_ARGS (new_latency));
gst_element_post_message (GST_ELEMENT_CAST (adder),
gst_message_new_latency (GST_OBJECT_CAST (adder)));
}
break;
}
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_live_adder_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec)
{
GstLiveAdder *adder = GST_LIVE_ADDER (object);
switch (prop_id) {
case PROP_LATENCY:
GST_OBJECT_LOCK (adder);
g_value_set_uint (value, adder->latency_ms);
GST_OBJECT_UNLOCK (adder);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
/* we can only accept caps that we and downstream can handle. */
static GstCaps *
gst_live_adder_sink_getcaps (GstPad * pad)
{
GstLiveAdder *adder;
GstCaps *result, *peercaps, *sinkcaps;
adder = GST_LIVE_ADDER (GST_PAD_PARENT (pad));
/* get the downstream possible caps */
peercaps = gst_pad_peer_get_caps (adder->srcpad);
/* get the allowed caps on this sinkpad, we use the fixed caps function so
* that it does not call recursively in this function. */
sinkcaps = gst_pad_get_fixed_caps_func (pad);
if (peercaps) {
/* if the peer has caps, intersect */
GST_DEBUG_OBJECT (adder, "intersecting peer and template caps");
result = gst_caps_intersect (peercaps, sinkcaps);
gst_caps_unref (peercaps);
gst_caps_unref (sinkcaps);
} else {
/* the peer has no caps (or there is no peer), just use the allowed caps
* of this sinkpad. */
GST_DEBUG_OBJECT (adder, "no peer caps, using sinkcaps");
result = sinkcaps;
}
return result;
}
/* the first caps we receive on any of the sinkpads will define the caps for all
* the other sinkpads because we can only mix streams with the same caps.
* */
static gboolean
gst_live_adder_setcaps (GstPad * pad, GstCaps * caps)
{
GstLiveAdder *adder;
GList *pads;
GstStructure *structure;
const char *media_type;
adder = GST_LIVE_ADDER (GST_PAD_PARENT (pad));
GST_LOG_OBJECT (adder, "setting caps on pad %p,%s to %" GST_PTR_FORMAT, pad,
GST_PAD_NAME (pad), caps);
/* FIXME, see if the other pads can accept the format. Also lock the
* format on the other pads to this new format. */
GST_OBJECT_LOCK (adder);
pads = GST_ELEMENT (adder)->pads;
while (pads) {
GstPad *otherpad = GST_PAD (pads->data);
if (otherpad != pad)
gst_caps_replace (&GST_PAD_CAPS (otherpad), caps);
pads = g_list_next (pads);
}
/* parse caps now */
structure = gst_caps_get_structure (caps, 0);
media_type = gst_structure_get_name (structure);
if (strcmp (media_type, "audio/x-raw-int") == 0) {
GST_DEBUG_OBJECT (adder, "parse_caps sets adder to format int");
adder->format = GST_LIVE_ADDER_FORMAT_INT;
gst_structure_get_int (structure, "width", &adder->width);
gst_structure_get_int (structure, "depth", &adder->depth);
gst_structure_get_int (structure, "endianness", &adder->endianness);
gst_structure_get_boolean (structure, "signed", &adder->is_signed);
if (adder->endianness != G_BYTE_ORDER)
goto not_supported;
switch (adder->width) {
case 8:
adder->func = (adder->is_signed ?
(GstLiveAdderFunction) add_int8 : (GstLiveAdderFunction) add_uint8);
break;
case 16:
adder->func = (adder->is_signed ?
(GstLiveAdderFunction) add_int16 : (GstLiveAdderFunction)
add_uint16);
break;
case 32:
adder->func = (adder->is_signed ?
(GstLiveAdderFunction) add_int32 : (GstLiveAdderFunction)
add_uint32);
break;
default:
goto not_supported;
}
} else if (strcmp (media_type, "audio/x-raw-float") == 0) {
GST_DEBUG_OBJECT (adder, "parse_caps sets adder to format float");
adder->format = GST_LIVE_ADDER_FORMAT_FLOAT;
gst_structure_get_int (structure, "width", &adder->width);
switch (adder->width) {
case 32:
adder->func = (GstLiveAdderFunction) add_float32;
break;
case 64:
adder->func = (GstLiveAdderFunction) add_float64;
break;
default:
goto not_supported;
}
} else {
goto not_supported;
}
gst_structure_get_int (structure, "channels", &adder->channels);
gst_structure_get_int (structure, "rate", &adder->rate);
/* precalc bps */
adder->bps = (adder->width / 8) * adder->channels;
GST_OBJECT_UNLOCK (adder);
return TRUE;
/* ERRORS */
not_supported:
{
GST_OBJECT_UNLOCK (adder);
GST_DEBUG_OBJECT (adder, "unsupported format set as caps");
return FALSE;
}
}
static void
gst_live_adder_flush_start (GstLiveAdder * adder)
{
GST_DEBUG_OBJECT (adder, "Disabling pop on queue");
GST_OBJECT_LOCK (adder);
/* mark ourselves as flushing */
adder->srcresult = GST_FLOW_WRONG_STATE;
/* Empty the queue */
g_queue_foreach (adder->buffers, (GFunc) gst_mini_object_unref, NULL);
while (g_queue_pop_head (adder->buffers));
/* unlock clock, we just unschedule, the entry will be released by the
* locking streaming thread. */
if (adder->clock_id)
gst_clock_id_unschedule (adder->clock_id);
g_cond_broadcast (adder->not_empty_cond);
GST_OBJECT_UNLOCK (adder);
}
static gboolean
gst_live_adder_src_activate_push (GstPad * pad, gboolean active)
{
gboolean result = TRUE;
GstLiveAdder *adder = NULL;
adder = GST_LIVE_ADDER (gst_pad_get_parent (pad));
if (active) {
/* Mark as non flushing */
GST_OBJECT_LOCK (adder);
adder->srcresult = GST_FLOW_OK;
GST_OBJECT_UNLOCK (adder);
/* start pushing out buffers */
GST_DEBUG_OBJECT (adder, "Starting task on srcpad");
gst_pad_start_task (adder->srcpad,
(GstTaskFunction) gst_live_adder_loop, adder);
} else {
/* make sure all data processing stops ASAP */
gst_live_adder_flush_start (adder);
/* NOTE this will hardlock if the state change is called from the src pad
* task thread because we will _join() the thread. */
GST_DEBUG_OBJECT (adder, "Stopping task on srcpad");
result = gst_pad_stop_task (pad);
}
gst_object_unref (adder);
return result;
}
static gboolean
gst_live_adder_sink_event (GstPad * pad, GstEvent * event)
{
gboolean ret = TRUE;
GstLiveAdder *adder = NULL;
GstLiveAdderPadPrivate *padprivate = NULL;
adder = GST_LIVE_ADDER (gst_pad_get_parent (pad));
padprivate = gst_pad_get_element_private (pad);
if (!padprivate)
return FALSE;
GST_LOG_OBJECT (adder, "received %s", GST_EVENT_TYPE_NAME (event));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_NEWSEGMENT:
{
GstFormat format;
gdouble rate, arate;
gint64 start, stop, time;
gboolean update;
gst_event_parse_new_segment_full (event, &update, &rate, &arate, &format,
&start, &stop, &time);
gst_event_unref (event);
/* we need time for now */
if (format != GST_FORMAT_TIME)
goto newseg_wrong_format;
GST_DEBUG_OBJECT (adder,
"newsegment: update %d, rate %g, arate %g, start %" GST_TIME_FORMAT
", stop %" GST_TIME_FORMAT ", time %" GST_TIME_FORMAT,
update, rate, arate, GST_TIME_ARGS (start), GST_TIME_ARGS (stop),
GST_TIME_ARGS (time));
/* now configure the values, we need these to time the release of the
* buffers on the srcpad. */
GST_OBJECT_LOCK (adder);
gst_segment_set_newsegment_full (&padprivate->segment, update,
rate, arate, format, start, stop, time);
GST_OBJECT_UNLOCK (adder);
break;
}
case GST_EVENT_FLUSH_START:
gst_live_adder_flush_start (adder);
ret = gst_pad_push_event (adder->srcpad, event);
break;
case GST_EVENT_FLUSH_STOP:
GST_OBJECT_LOCK (adder);
adder->segment_pending = TRUE;
adder->next_timestamp = GST_CLOCK_TIME_NONE;
reset_pad_private (pad);
adder->segment_pending = TRUE;
GST_OBJECT_UNLOCK (adder);
ret = gst_pad_push_event (adder->srcpad, event);
ret = gst_live_adder_src_activate_push (adder->srcpad, TRUE);
break;
case GST_EVENT_EOS:
{
GST_OBJECT_LOCK (adder);
ret = adder->srcresult == GST_FLOW_OK;
if (ret && !padprivate->eos) {
GST_DEBUG_OBJECT (adder, "queuing EOS");
padprivate->eos = TRUE;
g_cond_broadcast (adder->not_empty_cond);
} else if (padprivate->eos) {
GST_DEBUG_OBJECT (adder, "dropping EOS, we are already EOS");
} else {
GST_DEBUG_OBJECT (adder, "dropping EOS, reason %s",
gst_flow_get_name (adder->srcresult));
}
GST_OBJECT_UNLOCK (adder);
gst_event_unref (event);
break;
}
default:
ret = gst_pad_push_event (adder->srcpad, event);
break;
}
done:
gst_object_unref (adder);
return ret;
/* ERRORS */
newseg_wrong_format:
{
GST_DEBUG_OBJECT (adder, "received non TIME newsegment");
ret = FALSE;
goto done;
}
}
static gboolean
gst_live_adder_query_pos_dur (GstLiveAdder * adder, GstFormat informat,
gboolean position, gint64 * outvalue)
{
gint64 max = G_MININT64;
gboolean res = TRUE;
GstIterator *it;
gboolean done = FALSE;
it = gst_element_iterate_sink_pads (GST_ELEMENT_CAST (adder));
while (!done) {
GstIteratorResult ires;
gpointer item;
GstFormat format = informat;
ires = gst_iterator_next (it, &item);
switch (ires) {
case GST_ITERATOR_DONE:
done = TRUE;
break;
case GST_ITERATOR_OK:
{
GstPad *pad = GST_PAD_CAST (item);
gint64 value;
gboolean curres;
/* ask sink peer for duration */
if (position)
curres = gst_pad_query_peer_position (pad, &format, &value);
else
curres = gst_pad_query_peer_duration (pad, &format, &value);
/* take max from all valid return values */
/* Only if the format is the one we requested, otherwise ignore it ?
*/
if (curres && format == informat) {
res &= curres;
/* valid unknown length, stop searching */
if (value == -1) {
max = value;
done = TRUE;
} else if (value > max) {
max = value;
}
}
break;
}
case GST_ITERATOR_RESYNC:
max = -1;
res = TRUE;
break;
default:
res = FALSE;
done = TRUE;
break;
}
}
gst_iterator_free (it);
if (res)
*outvalue = max;
return res;
}
/* FIXME:
*
* When we add a new stream (or remove a stream) the duration might
* also become invalid again and we need to post a new DURATION
* message to notify this fact to the parent.
* For now we take the max of all the upstream elements so the simple
* cases work at least somewhat.
*/
static gboolean
gst_live_adder_query_duration (GstLiveAdder * adder, GstQuery * query)
{
GstFormat format;
gint64 max;
gboolean res;
/* parse format */
gst_query_parse_duration (query, &format, NULL);
res = gst_live_adder_query_pos_dur (adder, format, FALSE, &max);
if (res) {
/* and store the max */
gst_query_set_duration (query, format, max);
}
return res;
}
static gboolean
gst_live_adder_query_position (GstLiveAdder * adder, GstQuery * query)
{
GstFormat format;
gint64 max;
gboolean res;
/* parse format */
gst_query_parse_position (query, &format, NULL);
res = gst_live_adder_query_pos_dur (adder, format, TRUE, &max);
if (res) {
/* and store the max */
gst_query_set_position (query, format, max);
}
return res;
}
static gboolean
gst_live_adder_query (GstPad * pad, GstQuery * query)
{
GstLiveAdder *adder;
gboolean res = FALSE;
adder = GST_LIVE_ADDER (gst_pad_get_parent (pad));
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_LATENCY:
{
/* We need to send the query upstream and add the returned latency to our
* own */
GstClockTime min_latency = 0, max_latency = G_MAXUINT64;
gpointer item;
GstIterator *iter = NULL;
gboolean done = FALSE;
iter = gst_element_iterate_sink_pads (GST_ELEMENT (adder));
while (!done) {
switch (gst_iterator_next (iter, &item)) {
case GST_ITERATOR_OK:
{
GstPad *sinkpad = item;
GstClockTime pad_min_latency, pad_max_latency;
gboolean pad_us_live;
if (gst_pad_peer_query (sinkpad, query)) {
gst_query_parse_latency (query, &pad_us_live, &pad_min_latency,
&pad_max_latency);
res = TRUE;
GST_DEBUG_OBJECT (adder, "Peer latency for pad %s: min %"
GST_TIME_FORMAT " max %" GST_TIME_FORMAT,
GST_PAD_NAME (sinkpad),
GST_TIME_ARGS (pad_min_latency),
GST_TIME_ARGS (pad_max_latency));
min_latency = MAX (pad_min_latency, min_latency);
max_latency = MIN (pad_max_latency, max_latency);
}
gst_object_unref (item);
}
break;
case GST_ITERATOR_RESYNC:
min_latency = 0;
max_latency = G_MAXUINT64;
gst_iterator_resync (iter);
break;
case GST_ITERATOR_ERROR:
GST_ERROR_OBJECT (adder, "Error looping sink pads");
done = TRUE;
break;
case GST_ITERATOR_DONE:
done = TRUE;
break;
}
}
gst_iterator_free (iter);
if (res) {
GstClockTime my_latency = adder->latency_ms * GST_MSECOND;
GST_OBJECT_LOCK (adder);
adder->peer_latency = min_latency;
min_latency += my_latency;
GST_OBJECT_UNLOCK (adder);
/* Make sure we don't risk an overflow */
if (max_latency < G_MAXUINT64 - my_latency)
max_latency += my_latency;
else
max_latency = G_MAXUINT64;
gst_query_set_latency (query, TRUE, min_latency, max_latency);
GST_DEBUG_OBJECT (adder, "Calculated total latency : min %"
GST_TIME_FORMAT " max %" GST_TIME_FORMAT,
GST_TIME_ARGS (min_latency), GST_TIME_ARGS (max_latency));
}
break;
}
case GST_QUERY_DURATION:
res = gst_live_adder_query_duration (adder, query);
break;
case GST_QUERY_POSITION:
res = gst_live_adder_query_position (adder, query);
break;
default:
res = gst_pad_query_default (pad, query);
break;
}
gst_object_unref (adder);
return res;
}
static gboolean
forward_event_func (GstPad * pad, GValue * ret, GstEvent * event)
{
gst_event_ref (event);
GST_LOG_OBJECT (pad, "About to send event %s", GST_EVENT_TYPE_NAME (event));
if (!gst_pad_push_event (pad, event)) {
g_value_set_boolean (ret, FALSE);
GST_WARNING_OBJECT (pad, "Sending event %p (%s) failed.",
event, GST_EVENT_TYPE_NAME (event));
} else {
GST_LOG_OBJECT (pad, "Sent event %p (%s).",
event, GST_EVENT_TYPE_NAME (event));
}
/* unref the pad because of a FIXME in gst_iterator_unfold
* it does a gst_iterator_next which refs the pad, but it never unrefs it
*/
gst_object_unref (pad);
return TRUE;
}
/* forwards the event to all sinkpads, takes ownership of the
* event
*
* Returns: TRUE if the event could be forwarded on all
* sinkpads.
*/
static gboolean
forward_event (GstLiveAdder * adder, GstEvent * event)
{
gboolean ret;
GstIterator *it;
GValue vret = { 0 };
GST_LOG_OBJECT (adder, "Forwarding event %p (%s)", event,
GST_EVENT_TYPE_NAME (event));
ret = TRUE;
g_value_init (&vret, G_TYPE_BOOLEAN);
g_value_set_boolean (&vret, TRUE);
it = gst_element_iterate_sink_pads (GST_ELEMENT_CAST (adder));
gst_iterator_fold (it, (GstIteratorFoldFunction) forward_event_func, &vret,
event);
gst_iterator_free (it);
ret = g_value_get_boolean (&vret);
return ret;
}
static gboolean
gst_live_adder_src_event (GstPad * pad, GstEvent * event)
{
GstLiveAdder *adder;
gboolean result;
adder = GST_LIVE_ADDER (gst_pad_get_parent (pad));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_QOS:
/* TODO : QoS might be tricky */
result = FALSE;
break;
case GST_EVENT_NAVIGATION:
/* TODO : navigation is rather pointless. */
result = FALSE;
break;
default:
/* just forward the rest for now */
result = forward_event (adder, event);
break;
}
gst_event_unref (event);
gst_object_unref (adder);
return result;
}
static guint
gst_live_adder_length_from_duration (GstLiveAdder * adder,
GstClockTime duration)
{
guint64 ret = (duration * adder->rate / GST_SECOND) * adder->bps;
return (guint) ret;
}
static GstFlowReturn
gst_live_live_adder_chain (GstPad * pad, GstBuffer * buffer)
{
GstLiveAdder *adder = GST_LIVE_ADDER (gst_pad_get_parent_element (pad));
GstLiveAdderPadPrivate *padprivate = NULL;
GstFlowReturn ret = GST_FLOW_OK;
GList *item = NULL;
GstClockTime skip = 0;
gint64 drift = 0; /* Positive if new buffer after old buffer */
GST_OBJECT_LOCK (adder);
ret = adder->srcresult;
GST_DEBUG ("Incoming buffer time:%" GST_TIME_FORMAT " duration:%"
GST_TIME_FORMAT, GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)),
GST_TIME_ARGS (GST_BUFFER_DURATION (buffer)));
if (ret != GST_FLOW_OK) {
GST_DEBUG_OBJECT (adder, "Passing non-ok result from src: %s",
gst_flow_get_name (ret));
gst_buffer_unref (buffer);
goto out;
}
padprivate = gst_pad_get_element_private (pad);
if (!padprivate) {
ret = GST_FLOW_NOT_LINKED;
gst_buffer_unref (buffer);
goto out;
}
if (padprivate->eos) {
GST_DEBUG_OBJECT (adder, "Received buffer after EOS");
ret = GST_FLOW_UNEXPECTED;
gst_buffer_unref (buffer);
goto out;
}
if (!GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
goto invalid_timestamp;
if (padprivate->segment.format == GST_FORMAT_UNDEFINED) {
GST_WARNING_OBJECT (adder, "No new-segment received,"
" initializing segment with time 0..-1");
gst_segment_init (&padprivate->segment, GST_FORMAT_TIME);
gst_segment_set_newsegment (&padprivate->segment,
FALSE, 1.0, GST_FORMAT_TIME, 0, -1, 0);
}
if (padprivate->segment.format != GST_FORMAT_TIME)
goto invalid_segment;
buffer = gst_buffer_make_metadata_writable (buffer);
drift = GST_BUFFER_TIMESTAMP (buffer) - padprivate->expected_timestamp;
/* Just see if we receive invalid timestamp/durations */
if (GST_CLOCK_TIME_IS_VALID (padprivate->expected_timestamp) &&
!GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT) &&
(drift != 0)) {
GST_LOG_OBJECT (adder,
"Timestamp discontinuity without the DISCONT flag set"
" (expected %" GST_TIME_FORMAT ", got %" GST_TIME_FORMAT
" drift:%" G_GINT64_FORMAT "ms)",
GST_TIME_ARGS (padprivate->expected_timestamp),
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)), drift / GST_MSECOND);
/* We accept drifts of 10ms */
if (ABS (drift) < (10 * GST_MSECOND)) {
GST_DEBUG ("Correcting minor drift");
GST_BUFFER_TIMESTAMP (buffer) = padprivate->expected_timestamp;
}
}
/* If there is no duration, lets set one */
if (!GST_BUFFER_DURATION_IS_VALID (buffer)) {
GST_BUFFER_DURATION (buffer) =
gst_audio_duration_from_pad_buffer (pad, buffer);
padprivate->expected_timestamp = GST_CLOCK_TIME_NONE;
} else {
padprivate->expected_timestamp = GST_BUFFER_TIMESTAMP (buffer) +
GST_BUFFER_DURATION (buffer);
}
/*
* Lets clip the buffer to the segment (so we don't have to worry about
* cliping afterwards).
* This should also guarantee us that we'll have valid timestamps and
* durations afterwards
*/
buffer = gst_audio_buffer_clip (buffer, &padprivate->segment, adder->rate,
adder->bps);
/* buffer can be NULL if it's completely outside of the segment */
if (!buffer) {
GST_DEBUG ("Buffer completely outside of configured segment, dropping it");
goto out;
}
/*
* Make sure all incoming buffers share the same timestamping
*/
GST_BUFFER_TIMESTAMP (buffer) =
gst_segment_to_running_time (&padprivate->segment,
padprivate->segment.format, GST_BUFFER_TIMESTAMP (buffer));
if (GST_CLOCK_TIME_IS_VALID (adder->next_timestamp) &&
GST_BUFFER_TIMESTAMP (buffer) < adder->next_timestamp) {
if (GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer) <
adder->next_timestamp) {
GST_DEBUG_OBJECT (adder, "Buffer is late, dropping (ts: %" GST_TIME_FORMAT
" duration: %" GST_TIME_FORMAT ")",
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)),
GST_TIME_ARGS (GST_BUFFER_DURATION (buffer)));
gst_buffer_unref (buffer);
goto out;
} else {
skip = adder->next_timestamp - GST_BUFFER_TIMESTAMP (buffer);
GST_DEBUG_OBJECT (adder, "Buffer is partially late, skipping %"
GST_TIME_FORMAT, GST_TIME_ARGS (skip));
}
}
/* If our new buffer's head is higher than the queue's head, lets wake up,
* we may not have to wait for as long
*/
if (adder->clock_id &&
g_queue_peek_head (adder->buffers) != NULL &&
GST_BUFFER_TIMESTAMP (buffer) + skip <
GST_BUFFER_TIMESTAMP (g_queue_peek_head (adder->buffers)))
gst_clock_id_unschedule (adder->clock_id);
for (item = g_queue_peek_head_link (adder->buffers);
item; item = g_list_next (item)) {
GstBuffer *oldbuffer = item->data;
GstClockTime old_skip = 0;
GstClockTime mix_duration = 0;
GstClockTime mix_start = 0;
GstClockTime mix_end = 0;
/* We haven't reached our place yet */
if (GST_BUFFER_TIMESTAMP (buffer) + skip >=
GST_BUFFER_TIMESTAMP (oldbuffer) + GST_BUFFER_DURATION (oldbuffer))
continue;
/* We're past our place, lets insert ouselves here */
if (GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer) <=
GST_BUFFER_TIMESTAMP (oldbuffer))
break;
/* if we reach this spot, we have overlap, so we must mix */
/* First make a subbuffer with the non-overlapping part */
if (GST_BUFFER_TIMESTAMP (buffer) + skip < GST_BUFFER_TIMESTAMP (oldbuffer)) {
GstBuffer *subbuffer = NULL;
GstClockTime subbuffer_duration = GST_BUFFER_TIMESTAMP (oldbuffer) -
(GST_BUFFER_TIMESTAMP (buffer) + skip);
subbuffer = gst_buffer_create_sub (buffer,
gst_live_adder_length_from_duration (adder, skip),
gst_live_adder_length_from_duration (adder, subbuffer_duration));
GST_BUFFER_TIMESTAMP (subbuffer) = GST_BUFFER_TIMESTAMP (buffer) + skip;
GST_BUFFER_DURATION (subbuffer) = subbuffer_duration;
skip += subbuffer_duration;
g_queue_insert_before (adder->buffers, item, subbuffer);
}
/* Now we are on the overlapping part */
oldbuffer = gst_buffer_make_writable (oldbuffer);
item->data = oldbuffer;
old_skip = GST_BUFFER_TIMESTAMP (buffer) + skip -
GST_BUFFER_TIMESTAMP (oldbuffer);
mix_start = GST_BUFFER_TIMESTAMP (oldbuffer) + old_skip;
if (GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer) <
GST_BUFFER_TIMESTAMP (oldbuffer) + GST_BUFFER_DURATION (oldbuffer))
mix_end = GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer);
else
mix_end = GST_BUFFER_TIMESTAMP (oldbuffer) +
GST_BUFFER_DURATION (oldbuffer);
mix_duration = mix_end - mix_start;
adder->func (GST_BUFFER_DATA (oldbuffer) +
gst_live_adder_length_from_duration (adder, old_skip),
GST_BUFFER_DATA (buffer) +
gst_live_adder_length_from_duration (adder, skip),
gst_live_adder_length_from_duration (adder, mix_duration));
skip += mix_duration;
}
g_cond_broadcast (adder->not_empty_cond);
if (skip == GST_BUFFER_DURATION (buffer)) {
gst_buffer_unref (buffer);
} else {
if (skip) {
GstClockTime subbuffer_duration = GST_BUFFER_DURATION (buffer) - skip;
GstClockTime subbuffer_ts = GST_BUFFER_TIMESTAMP (buffer) + skip;
buffer = gst_buffer_create_sub (buffer,
gst_live_adder_length_from_duration (adder, skip),
gst_live_adder_length_from_duration (adder, subbuffer_duration));
GST_BUFFER_TIMESTAMP (buffer) = subbuffer_ts;
GST_BUFFER_DURATION (buffer) = subbuffer_duration;
}
if (item)
g_queue_insert_before (adder->buffers, item, buffer);
else
g_queue_push_tail (adder->buffers, buffer);
}
out:
GST_OBJECT_UNLOCK (adder);
gst_object_unref (adder);
return ret;
invalid_timestamp:
GST_OBJECT_UNLOCK (adder);
gst_buffer_unref (buffer);
GST_ELEMENT_ERROR (adder, STREAM, FAILED,
("Buffer without a valid timestamp received"),
("Invalid timestamp received on buffer"));
return GST_FLOW_ERROR;
invalid_segment:
{
const gchar *format = gst_format_get_name (padprivate->segment.format);
GST_OBJECT_UNLOCK (adder);
gst_buffer_unref (buffer);
GST_ELEMENT_ERROR (adder, STREAM, FAILED,
("This element only supports TIME segments, received other type"),
("Received a segment of type %s, only support time segment", format));
return GST_FLOW_ERROR;
}
}
/*
* This only works because the GstObject lock is taken
*
* It checks if all sink pads are EOS
*/
static gboolean
check_eos_locked (GstLiveAdder * adder)
{
GList *item;
/* We can't be EOS if we have no sinkpads */
if (adder->sinkpads == NULL)
return FALSE;
for (item = adder->sinkpads; item; item = g_list_next (item)) {
GstPad *pad = item->data;
GstLiveAdderPadPrivate *padprivate = gst_pad_get_element_private (pad);
if (padprivate && padprivate->eos != TRUE)
return FALSE;
}
return TRUE;
}
static void
gst_live_adder_loop (gpointer data)
{
GstLiveAdder *adder = GST_LIVE_ADDER (data);
GstClockTime buffer_timestamp = 0;
GstClockTime sync_time = 0;
GstClock *clock = NULL;
GstClockID id = NULL;
GstClockReturn ret;
GstBuffer *buffer = NULL;
GstFlowReturn result;
GstEvent *newseg_event = NULL;
GST_OBJECT_LOCK (adder);
again:
for (;;) {
if (adder->srcresult != GST_FLOW_OK)
goto flushing;
if (!g_queue_is_empty (adder->buffers))
break;
if (check_eos_locked (adder))
goto eos;
g_cond_wait (adder->not_empty_cond, GST_OBJECT_GET_LOCK (adder));
}
buffer_timestamp = GST_BUFFER_TIMESTAMP (g_queue_peek_head (adder->buffers));
clock = GST_ELEMENT_CLOCK (adder);
/* If we have no clock, then we can't do anything.. error */
if (!clock) {
if (adder->playing)
goto no_clock;
else
goto push_buffer;
}
GST_DEBUG_OBJECT (adder, "sync to timestamp %" GST_TIME_FORMAT,
GST_TIME_ARGS (buffer_timestamp));
sync_time = buffer_timestamp + GST_ELEMENT_CAST (adder)->base_time;
/* add latency, this includes our own latency and the peer latency. */
sync_time += adder->latency_ms * GST_MSECOND;
sync_time += adder->peer_latency;
/* create an entry for the clock */
id = adder->clock_id = gst_clock_new_single_shot_id (clock, sync_time);
GST_OBJECT_UNLOCK (adder);
ret = gst_clock_id_wait (id, NULL);
GST_OBJECT_LOCK (adder);
/* and free the entry */
gst_clock_id_unref (id);
adder->clock_id = NULL;
/* at this point, the clock could have been unlocked by a timeout, a new
* head element was added to the queue or because we are shutting down. Check
* for shutdown first. */
if (adder->srcresult != GST_FLOW_OK)
goto flushing;
if (ret == GST_CLOCK_UNSCHEDULED) {
GST_DEBUG_OBJECT (adder,
"Wait got unscheduled, will retry to push with new buffer");
goto again;
}
if (ret != GST_CLOCK_OK && ret != GST_CLOCK_EARLY)
goto clock_error;
push_buffer:
buffer = g_queue_pop_head (adder->buffers);
if (!buffer)
goto again;
/*
* We make sure the timestamps are exactly contiguous
* If its only small skew (due to rounding errors), we correct it
* silently. Otherwise we put the discont flag
*/
if (GST_CLOCK_TIME_IS_VALID (adder->next_timestamp) &&
GST_BUFFER_TIMESTAMP (buffer) != adder->next_timestamp) {
GstClockTimeDiff diff = GST_CLOCK_DIFF (GST_BUFFER_TIMESTAMP (buffer),
adder->next_timestamp);
if (diff < 0)
diff = -diff;
if (diff < GST_SECOND / adder->rate) {
GST_BUFFER_TIMESTAMP (buffer) = adder->next_timestamp;
GST_DEBUG_OBJECT (adder, "Correcting slight skew");
GST_BUFFER_FLAG_UNSET (buffer, GST_BUFFER_FLAG_DISCONT);
} else {
GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
GST_DEBUG_OBJECT (adder, "Expected buffer at %" GST_TIME_FORMAT
", but is at %" GST_TIME_FORMAT ", setting discont",
GST_TIME_ARGS (adder->next_timestamp),
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)));
}
} else {
GST_BUFFER_FLAG_UNSET (buffer, GST_BUFFER_FLAG_DISCONT);
}
GST_BUFFER_OFFSET (buffer) = GST_BUFFER_OFFSET_NONE;
GST_BUFFER_OFFSET_END (buffer) = GST_BUFFER_OFFSET_NONE;
if (GST_BUFFER_DURATION_IS_VALID (buffer))
adder->next_timestamp = GST_BUFFER_TIMESTAMP (buffer) +
GST_BUFFER_DURATION (buffer);
else
adder->next_timestamp = GST_CLOCK_TIME_NONE;
if (adder->segment_pending) {
/*
* We set the start at 0, because we re-timestamps to the running time
*/
newseg_event = gst_event_new_new_segment_full (FALSE, 1.0, 1.0,
GST_FORMAT_TIME, 0, -1, 0);
adder->segment_pending = FALSE;
}
GST_OBJECT_UNLOCK (adder);
if (newseg_event)
gst_pad_push_event (adder->srcpad, newseg_event);
GST_LOG_OBJECT (adder, "About to push buffer time:%" GST_TIME_FORMAT
" duration:%" GST_TIME_FORMAT,
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)),
GST_TIME_ARGS (GST_BUFFER_DURATION (buffer)));
result = gst_pad_push (adder->srcpad, buffer);
if (result != GST_FLOW_OK)
goto pause;
return;
flushing:
{
GST_DEBUG_OBJECT (adder, "we are flushing");
gst_pad_pause_task (adder->srcpad);
GST_OBJECT_UNLOCK (adder);
return;
}
clock_error:
{
gst_pad_pause_task (adder->srcpad);
GST_OBJECT_UNLOCK (adder);
GST_ELEMENT_ERROR (adder, STREAM, MUX, ("Error with the clock"),
("Error with the clock: %d", ret));
GST_ERROR_OBJECT (adder, "Error with the clock: %d", ret);
return;
}
no_clock:
{
gst_pad_pause_task (adder->srcpad);
GST_OBJECT_UNLOCK (adder);
GST_ELEMENT_ERROR (adder, STREAM, MUX, ("No available clock"),
("No available clock"));
GST_ERROR_OBJECT (adder, "No available clock");
return;
}
pause:
{
GST_DEBUG_OBJECT (adder, "pausing task, reason %s",
gst_flow_get_name (result));
GST_OBJECT_LOCK (adder);
/* store result */
adder->srcresult = result;
/* we don't post errors or anything because upstream will do that for us
* when we pass the return value upstream. */
gst_pad_pause_task (adder->srcpad);
GST_OBJECT_UNLOCK (adder);
return;
}
eos:
{
/* store result, we are flushing now */
GST_DEBUG_OBJECT (adder, "We are EOS, pushing EOS downstream");
adder->srcresult = GST_FLOW_UNEXPECTED;
gst_pad_pause_task (adder->srcpad);
GST_OBJECT_UNLOCK (adder);
gst_pad_push_event (adder->srcpad, gst_event_new_eos ());
return;
}
}
static GstPad *
gst_live_adder_request_new_pad (GstElement * element, GstPadTemplate * templ,
const gchar * unused)
{
gchar *name;
GstLiveAdder *adder;
GstPad *newpad;
gint padcount;
GstLiveAdderPadPrivate *padprivate = NULL;
if (templ->direction != GST_PAD_SINK)
goto not_sink;
adder = GST_LIVE_ADDER (element);
/* increment pad counter */
padcount = g_atomic_int_exchange_and_add (&adder->padcount, 1);
name = g_strdup_printf ("sink%d", padcount);
newpad = gst_pad_new_from_template (templ, name);
GST_DEBUG_OBJECT (adder, "request new pad %s", name);
g_free (name);
gst_pad_set_getcaps_function (newpad,
GST_DEBUG_FUNCPTR (gst_live_adder_sink_getcaps));
gst_pad_set_setcaps_function (newpad,
GST_DEBUG_FUNCPTR (gst_live_adder_setcaps));
gst_pad_set_event_function (newpad,
GST_DEBUG_FUNCPTR (gst_live_adder_sink_event));
padprivate = g_new0 (GstLiveAdderPadPrivate, 1);
gst_segment_init (&padprivate->segment, GST_FORMAT_UNDEFINED);
padprivate->eos = FALSE;
padprivate->expected_timestamp = GST_CLOCK_TIME_NONE;
gst_pad_set_element_private (newpad, padprivate);
gst_pad_set_chain_function (newpad, gst_live_live_adder_chain);
if (!gst_pad_set_active (newpad, TRUE))
goto could_not_activate;
/* takes ownership of the pad */
if (!gst_element_add_pad (GST_ELEMENT (adder), newpad))
goto could_not_add;
GST_OBJECT_LOCK (adder);
adder->sinkpads = g_list_prepend (adder->sinkpads, newpad);
GST_OBJECT_UNLOCK (adder);
return newpad;
/* errors */
not_sink:
{
g_warning ("gstadder: request new pad that is not a SINK pad\n");
return NULL;
}
could_not_add:
{
GST_DEBUG_OBJECT (adder, "could not add pad");
g_free (padprivate);
gst_object_unref (newpad);
return NULL;
}
could_not_activate:
{
GST_DEBUG_OBJECT (adder, "could not activate new pad");
g_free (padprivate);
gst_object_unref (newpad);
return NULL;
}
}
static void
gst_live_adder_release_pad (GstElement * element, GstPad * pad)
{
GstLiveAdder *adder;
GstLiveAdderPadPrivate *padprivate;
adder = GST_LIVE_ADDER (element);
GST_DEBUG_OBJECT (adder, "release pad %s:%s", GST_DEBUG_PAD_NAME (pad));
GST_OBJECT_LOCK (element);
padprivate = gst_pad_get_element_private (pad);
gst_pad_set_element_private (pad, NULL);
adder->sinkpads = g_list_remove_all (adder->sinkpads, pad);
GST_OBJECT_UNLOCK (element);
g_free (padprivate);
gst_element_remove_pad (element, pad);
}
static void
reset_pad_private (GstPad * pad)
{
GstLiveAdderPadPrivate *padprivate;
padprivate = gst_pad_get_element_private (pad);
if (!padprivate)
return;
gst_segment_init (&padprivate->segment, GST_FORMAT_UNDEFINED);
padprivate->expected_timestamp = GST_CLOCK_TIME_NONE;
padprivate->eos = FALSE;
}
static GstStateChangeReturn
gst_live_adder_change_state (GstElement * element, GstStateChange transition)
{
GstLiveAdder *adder;
GstStateChangeReturn ret;
adder = GST_LIVE_ADDER (element);
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:
GST_OBJECT_LOCK (adder);
adder->segment_pending = TRUE;
adder->peer_latency = 0;
adder->next_timestamp = GST_CLOCK_TIME_NONE;
g_list_foreach (adder->sinkpads, (GFunc) reset_pad_private, NULL);
GST_OBJECT_UNLOCK (adder);
break;
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
GST_OBJECT_LOCK (adder);
adder->playing = FALSE;
GST_OBJECT_UNLOCK (adder);
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
GST_OBJECT_LOCK (adder);
adder->playing = TRUE;
GST_OBJECT_UNLOCK (adder);
break;
default:
break;
}
return ret;
}
static gboolean
plugin_init (GstPlugin * plugin)
{
if (!gst_element_register (plugin, "liveadder", GST_RANK_NONE,
GST_TYPE_LIVE_ADDER)) {
return FALSE;
}
return TRUE;
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"liveadder",
"Adds multiple live discontinuous streams",
plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)
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