gstreamer/gst/switch/gstswitch.c

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/* GStreamer
* Copyright (C) 2003 Julien Moutte <julien@moutte.net>
* Copyright (C) 2005 Ronald S. Bultje <rbultje@ronald.bitfreak.net>
* Copyright (C) 2005 Jan Schmidt <thaytan@mad.scientist.com>
* Copyright (C) 2007 Wim Taymans <wim.taymans@gmail.com>
* Copyright (C) 2007 Andy Wingo <wingo@pobox.com>
*
* 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 "gstswitch.h"
#include "gstswitch-marshal.h"
GST_DEBUG_CATEGORY_STATIC (stream_selector_debug);
#define GST_CAT_DEFAULT stream_selector_debug
static const GstElementDetails gst_stream_selector_details =
GST_ELEMENT_DETAILS ("StreamSelector",
"Generic",
"N-to-1 input stream_selectoring",
"Julien Moutte <julien@moutte.net>\n"
"Ronald S. Bultje <rbultje@ronald.bitfreak.net>\n"
"Jan Schmidt <thaytan@mad.scientist.com>\n"
"Wim Taymans <wim.taymans@gmail.com>");
static GstStaticPadTemplate gst_stream_selector_sink_factory =
GST_STATIC_PAD_TEMPLATE ("sink%d",
GST_PAD_SINK,
GST_PAD_REQUEST,
GST_STATIC_CAPS_ANY);
static GstStaticPadTemplate gst_stream_selector_src_factory =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
enum
{
PROP_ACTIVE_PAD = 1
};
enum
{
PAD_PROP_RUNNING_TIME = 1
};
enum
{
/* methods */
SIGNAL_BLOCK,
SIGNAL_SWITCH,
LAST_SIGNAL
};
static guint gst_stream_selector_signals[LAST_SIGNAL] = { 0 };
static gboolean gst_stream_selector_is_active_sinkpad (GstStreamSelector * sel,
GstPad * pad);
static GstPad *gst_stream_selector_activate_sinkpad (GstStreamSelector * sel,
GstPad * pad);
static GstPad *gst_stream_selector_get_linked_pad (GstPad * pad,
gboolean strict);
static void gst_stream_selector_push_pending_stop (GstStreamSelector * self);
#define GST_TYPE_SELECTOR_PAD \
(gst_selector_pad_get_type())
#define GST_SELECTOR_PAD(obj) \
(G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_SELECTOR_PAD, GstSelectorPad))
#define GST_SELECTOR_PAD_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_SELECTOR_PAD, GstSelectorPadClass))
#define GST_IS_SELECTOR_PAD(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_SELECTOR_PAD))
#define GST_IS_SELECTOR_PAD_CLASS(klass) \
(G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_SELECTOR_PAD))
#define GST_SELECTOR_PAD_CAST(obj) \
((GstSelectorPad *)(obj))
typedef struct _GstSelectorPad GstSelectorPad;
typedef struct _GstSelectorPadClass GstSelectorPadClass;
struct _GstSelectorPad
{
GstPad parent;
gboolean active;
gboolean eos;
gboolean segment_pending;
GstSegment segment;
};
struct _GstSelectorPadClass
{
GstPadClass parent;
};
static void gst_selector_pad_class_init (GstSelectorPadClass * klass);
static void gst_selector_pad_init (GstSelectorPad * pad);
static void gst_selector_pad_finalize (GObject * object);
static void gst_selector_pad_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec);
static GstPadClass *selector_pad_parent_class = NULL;
static gint64 gst_selector_pad_get_running_time (GstSelectorPad * pad);
static void gst_selector_pad_reset (GstSelectorPad * pad);
static gboolean gst_selector_pad_event (GstPad * pad, GstEvent * event);
static GstCaps *gst_selector_pad_getcaps (GstPad * pad);
static GList *gst_selector_pad_get_linked_pads (GstPad * pad);
static GstFlowReturn gst_selector_pad_chain (GstPad * pad, GstBuffer * buf);
static GstFlowReturn gst_selector_pad_bufferalloc (GstPad * pad,
guint64 offset, guint size, GstCaps * caps, GstBuffer ** buf);
static GType
gst_selector_pad_get_type (void)
{
static GType selector_pad_type = 0;
if (!selector_pad_type) {
static const GTypeInfo selector_pad_info = {
sizeof (GstSelectorPadClass),
NULL,
NULL,
(GClassInitFunc) gst_selector_pad_class_init,
NULL,
NULL,
sizeof (GstSelectorPad),
0,
(GInstanceInitFunc) gst_selector_pad_init,
};
selector_pad_type =
g_type_register_static (GST_TYPE_PAD, "GstSwitchPad",
&selector_pad_info, 0);
}
return selector_pad_type;
}
static void
gst_selector_pad_class_init (GstSelectorPadClass * klass)
{
GObjectClass *gobject_class;
gobject_class = (GObjectClass *) klass;
selector_pad_parent_class = g_type_class_peek_parent (klass);
gobject_class->get_property =
GST_DEBUG_FUNCPTR (gst_selector_pad_get_property);
g_object_class_install_property (gobject_class, PAD_PROP_RUNNING_TIME,
g_param_spec_int64 ("running-time", "Running time",
"Running time of stream on pad", 0, G_MAXINT64, 0, G_PARAM_READABLE));
gobject_class->finalize = gst_selector_pad_finalize;
}
static void
gst_selector_pad_init (GstSelectorPad * pad)
{
gst_selector_pad_reset (pad);
}
static void
gst_selector_pad_finalize (GObject * object)
{
GstSelectorPad *pad;
pad = GST_SELECTOR_PAD_CAST (object);
G_OBJECT_CLASS (selector_pad_parent_class)->finalize (object);
}
static void
gst_selector_pad_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstSelectorPad *spad = GST_SELECTOR_PAD_CAST (object);
switch (prop_id) {
case PAD_PROP_RUNNING_TIME:
g_value_set_int64 (value, gst_selector_pad_get_running_time (spad));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gint64
gst_selector_pad_get_running_time (GstSelectorPad * pad)
{
gint64 ret = 0;
GST_OBJECT_LOCK (pad);
if (pad->active) {
gint64 last_stop = pad->segment.last_stop;
if (last_stop >= 0)
ret = gst_segment_to_running_time (&pad->segment, GST_FORMAT_TIME,
last_stop);
}
GST_OBJECT_UNLOCK (pad);
GST_DEBUG_OBJECT (pad, "running time: %" GST_TIME_FORMAT,
GST_TIME_ARGS (ret));
return ret;
}
static void
gst_selector_pad_reset (GstSelectorPad * pad)
{
pad->active = FALSE;
pad->eos = FALSE;
gst_segment_init (&pad->segment, GST_FORMAT_UNDEFINED);
}
/* strictly get the linked pad from the sinkpad. If the pad is active we return
* the srcpad else we return NULL */
static GList *
gst_selector_pad_get_linked_pads (GstPad * pad)
{
GstPad *otherpad;
otherpad = gst_stream_selector_get_linked_pad (pad, TRUE);
if (!otherpad)
return NULL;
/* need to drop the ref, internal linked pads is not MT safe */
gst_object_unref (otherpad);
return g_list_append (NULL, otherpad);
}
static gboolean
gst_selector_pad_event (GstPad * pad, GstEvent * event)
{
gboolean res = TRUE;
gboolean forward = TRUE;
GstStreamSelector *sel;
GstSelectorPad *selpad;
sel = GST_STREAM_SELECTOR (gst_pad_get_parent (pad));
selpad = GST_SELECTOR_PAD_CAST (pad);
/* only forward if we are dealing with the active sinkpad */
forward = gst_stream_selector_is_active_sinkpad (sel, pad);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_STOP:
gst_selector_pad_reset (selpad);
break;
case GST_EVENT_NEWSEGMENT:
{
gboolean update;
GstFormat format;
gdouble rate, arate;
gint64 start, stop, time;
gst_event_parse_new_segment_full (event, &update, &rate, &arate, &format,
&start, &stop, &time);
GST_DEBUG_OBJECT (sel,
"configured NEWSEGMENT update %d, rate %lf, applied rate %lf, "
"format %d, "
"%" G_GINT64_FORMAT " -- %" G_GINT64_FORMAT ", time %"
G_GINT64_FORMAT, update, rate, arate, format, start, stop, time);
gst_segment_set_newsegment_full (&selpad->segment, update,
rate, arate, format, start, stop, time);
/* if we are not going to forward the segment, mark the segment as
* pending */
if (!forward)
selpad->segment_pending = TRUE;
break;
}
case GST_EVENT_EOS:
selpad->eos = TRUE;
break;
default:
break;
}
if (forward)
res = gst_pad_push_event (sel->srcpad, event);
gst_object_unref (sel);
return res;
}
static GstCaps *
gst_selector_pad_getcaps (GstPad * pad)
{
GstStreamSelector *sel;
GstCaps *caps;
sel = GST_STREAM_SELECTOR (gst_pad_get_parent (pad));
GST_DEBUG_OBJECT (sel, "Getting caps of srcpad peer");
caps = gst_pad_peer_get_caps (sel->srcpad);
if (caps == NULL)
caps = gst_caps_new_any ();
gst_object_unref (sel);
return caps;
}
static GstFlowReturn
gst_selector_pad_bufferalloc (GstPad * pad, guint64 offset,
guint size, GstCaps * caps, GstBuffer ** buf)
{
GstStreamSelector *sel;
GstFlowReturn result;
GstPad *active_sinkpad;
sel = GST_STREAM_SELECTOR (gst_pad_get_parent (pad));
active_sinkpad = gst_stream_selector_activate_sinkpad (sel, pad);
/* Fallback allocation for buffers from pads except the selected one */
if (pad != active_sinkpad) {
GST_DEBUG_OBJECT (sel,
"Pad %s:%s is not selected. Performing fallback allocation",
GST_DEBUG_PAD_NAME (pad));
*buf = NULL;
result = GST_FLOW_OK;
} else {
result = gst_pad_alloc_buffer (sel->srcpad, offset, size, caps, buf);
/* FIXME: HACK. If buffer alloc returns not-linked, perform a fallback
* allocation. This should NOT be necessary, because playbin should
* properly block the source pad from running until it's finished hooking
* everything up, but playbin needs refactoring first. */
if (result == GST_FLOW_NOT_LINKED) {
GST_DEBUG_OBJECT (sel,
"No peer pad yet - performing fallback allocation for pad %s:%s",
GST_DEBUG_PAD_NAME (pad));
*buf = NULL;
result = GST_FLOW_OK;
}
}
gst_object_unref (sel);
return result;
}
static gboolean
gst_stream_selector_wait (GstStreamSelector * self, GstPad * pad)
{
gboolean flushing;
GST_OBJECT_LOCK (self);
while (self->blocked)
g_cond_wait (self->blocked_cond, GST_OBJECT_GET_LOCK (self));
GST_OBJECT_UNLOCK (self);
GST_OBJECT_LOCK (pad);
flushing = GST_PAD_IS_FLUSHING (pad);
GST_OBJECT_UNLOCK (pad);
return flushing;
}
static GstFlowReturn
gst_selector_pad_chain (GstPad * pad, GstBuffer * buf)
{
GstStreamSelector *sel;
GstFlowReturn res;
GstPad *active_sinkpad;
GstSelectorPad *selpad;
GstClockTime end_time, duration;
GstSegment *seg;
sel = GST_STREAM_SELECTOR (gst_pad_get_parent (pad));
selpad = GST_SELECTOR_PAD_CAST (pad);
seg = &selpad->segment;
if (gst_stream_selector_wait (sel, pad))
goto ignore;
active_sinkpad = gst_stream_selector_activate_sinkpad (sel, pad);
end_time = GST_BUFFER_TIMESTAMP (buf);
if (GST_CLOCK_TIME_IS_VALID (end_time)) {
duration = GST_BUFFER_DURATION (buf);
if (GST_CLOCK_TIME_IS_VALID (duration))
end_time += duration;
GST_DEBUG_OBJECT (sel, "received end time %" GST_TIME_FORMAT,
GST_TIME_ARGS (end_time));
gst_segment_set_last_stop (seg, seg->format, end_time);
}
/* Ignore buffers from pads except the selected one */
if (pad != active_sinkpad)
goto ignore;
gst_stream_selector_push_pending_stop (sel);
/* if we have a pending segment, push it out now */
if (selpad->segment_pending) {
gst_pad_push_event (sel->srcpad, gst_event_new_new_segment_full (FALSE,
seg->rate, seg->applied_rate, seg->format, seg->start, seg->stop,
seg->time));
selpad->segment_pending = FALSE;
}
/* forward */
GST_DEBUG_OBJECT (sel, "Forwarding buffer %p from pad %s:%s", buf,
GST_DEBUG_PAD_NAME (pad));
res = gst_pad_push (sel->srcpad, buf);
done:
gst_object_unref (sel);
return res;
/* dropped buffers */
ignore:
{
GST_DEBUG_OBJECT (sel, "Ignoring buffer %p from pad %s:%s",
buf, GST_DEBUG_PAD_NAME (pad));
gst_buffer_unref (buf);
res = GST_FLOW_OK;
goto done;
}
}
static void gst_stream_selector_dispose (GObject * object);
static void gst_stream_selector_init (GstStreamSelector * sel);
static void gst_stream_selector_base_init (GstStreamSelectorClass * klass);
static void gst_stream_selector_class_init (GstStreamSelectorClass * klass);
static void gst_stream_selector_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec);
static void gst_stream_selector_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec);
static GstPad *gst_stream_selector_request_new_pad (GstElement * element,
GstPadTemplate * templ, const gchar * unused);
static void gst_stream_selector_release_pad (GstElement * element,
GstPad * pad);
static GstStateChangeReturn gst_stream_selector_change_state (GstElement *
element, GstStateChange transition);
static GList *gst_stream_selector_get_linked_pads (GstPad * pad);
static GstCaps *gst_stream_selector_getcaps (GstPad * pad);
static gint64 gst_stream_selector_block (GstStreamSelector * self);
static void gst_stream_selector_switch (GstStreamSelector * self,
const gchar * pad_name, gint64 stop_time, gint64 start_time);
static GstElementClass *parent_class = NULL;
GType
gst_stream_selector_get_type (void)
{
static GType stream_selector_type = 0;
if (!stream_selector_type) {
static const GTypeInfo stream_selector_info = {
sizeof (GstStreamSelectorClass),
(GBaseInitFunc) gst_stream_selector_base_init,
NULL,
(GClassInitFunc) gst_stream_selector_class_init,
NULL,
NULL,
sizeof (GstStreamSelector),
0,
(GInstanceInitFunc) gst_stream_selector_init,
};
stream_selector_type =
g_type_register_static (GST_TYPE_ELEMENT,
"GstSwitch", &stream_selector_info, 0);
GST_DEBUG_CATEGORY_INIT (stream_selector_debug,
"streamselector", 0, "A stream-selector element");
}
return stream_selector_type;
}
static void
gst_stream_selector_base_init (GstStreamSelectorClass * klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
gst_element_class_set_details (element_class, &gst_stream_selector_details);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_stream_selector_sink_factory));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_stream_selector_src_factory));
}
static void
gst_stream_selector_class_init (GstStreamSelectorClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
parent_class = g_type_class_peek_parent (klass);
gobject_class->set_property =
GST_DEBUG_FUNCPTR (gst_stream_selector_set_property);
gobject_class->get_property =
GST_DEBUG_FUNCPTR (gst_stream_selector_get_property);
g_object_class_install_property (gobject_class, PROP_ACTIVE_PAD,
g_param_spec_string ("active-pad", "Active pad",
"Name of the currently" " active sink pad", NULL, G_PARAM_READWRITE));
gobject_class->dispose = gst_stream_selector_dispose;
gstelement_class->request_new_pad = gst_stream_selector_request_new_pad;
gstelement_class->release_pad = gst_stream_selector_release_pad;
gstelement_class->change_state = gst_stream_selector_change_state;
/**
* GstStreamSelector::block:
* @streamselector: the #GstStreamSelector
*
* Block all sink pads in preparation for a switch. Returns the stop time of
* the current switch segment, as a running time, or 0 if there is no current
* active pad or the current active pad never received data.
*/
gst_stream_selector_signals[SIGNAL_BLOCK] =
g_signal_new ("block", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstStreamSelectorClass, block),
NULL, NULL, gst_switch_marshal_INT64__VOID, G_TYPE_INT64, 0);
/**
* GstStreamSelector::switch:
* @streamselector: the #GstStreamSelector
* @pad: name of pad to switch to
* @stop_time: running time at which to close the previous segment, or -1
* to use the running time of the previously active sink pad
* @start_time: running time at which to start the new segment, or -1 to
* use the running time of the newly active sink pad
*
* Switch to a new feed. The segment opened by the previously active pad, if
* any, will be closed, and a new segment opened before data flows again.
*
* This signal must be emitted when the element has been blocked via the <link
* linkend="GstStreamSelector-block">block</link> signal.
*
* If you have a stream with only one switch element, such as an audio-only
* stream, a stream switch should be performed by first emitting the block
* signal, and then emitting the switch signal with -1 for the stop and start
* time values.
*
* The intention of the @stop_time and @start_time arguments is to allow
* multiple switch elements to switch and maintain stream synchronization.
* When switching a stream with multiple feeds, you will need as many switch
* elements as you have feeds. For example, a feed with audio and video will
* have one switch element between the audio feeds and one for video.
*
* A switch over multiple switch elements should be performed as follows:
* First, emit the <link linkend="GstStreamSelector-block">block</link>
* signal, collecting the returned values. The maximum running time returned
* by block should then be used as the time at which to close the previous
* segment.
*
* Then, query the running times of the new audio and video pads that you will
* switch to. Naturally, these pads are on separate switch elements. Take the
* minimum running time for those streams and use it for the time at which to
* open the new segment.
*
* If @pad is the same as the current active pad, the element will cancel any
* previous block without adjusting segments.
*/
gst_stream_selector_signals[SIGNAL_SWITCH] =
g_signal_new ("switch", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstStreamSelectorClass, switch_),
NULL, NULL, gst_switch_marshal_VOID__STRING_INT64_INT64,
G_TYPE_NONE, 3, G_TYPE_STRING, G_TYPE_INT64, G_TYPE_INT64);
klass->block = GST_DEBUG_FUNCPTR (gst_stream_selector_block);
klass->switch_ = GST_DEBUG_FUNCPTR (gst_stream_selector_switch);
}
static void
gst_stream_selector_init (GstStreamSelector * sel)
{
sel->srcpad = gst_pad_new ("src", GST_PAD_SRC);
gst_pad_set_internal_link_function (sel->srcpad,
GST_DEBUG_FUNCPTR (gst_stream_selector_get_linked_pads));
gst_pad_set_getcaps_function (sel->srcpad,
GST_DEBUG_FUNCPTR (gst_stream_selector_getcaps));
gst_element_add_pad (GST_ELEMENT (sel), sel->srcpad);
/* sinkpad management */
sel->active_sinkpad = NULL;
sel->nb_sinkpads = 0;
gst_segment_init (&sel->segment, GST_FORMAT_UNDEFINED);
sel->blocked_cond = g_cond_new ();
sel->blocked = FALSE;
}
static void
gst_stream_selector_dispose (GObject * object)
{
GstStreamSelector *sel = GST_STREAM_SELECTOR (object);
if (sel->active_sinkpad) {
gst_object_unref (sel->active_sinkpad);
sel->active_sinkpad = NULL;
}
if (sel->blocked_cond) {
g_cond_free (sel->blocked_cond);
sel->blocked_cond = NULL;
}
G_OBJECT_CLASS (parent_class)->dispose (object);
}
/* Solve the following equation for B.timestamp, and set that as the segment
* stop:
* B.running_time = (B.timestamp - NS.start) / NS.abs_rate + NS.accum
*/
static gint64
gst_segment_get_timestamp (GstSegment * segment, gint64 running_time)
{
return (running_time - segment->accum) * segment->abs_rate + segment->start;
}
static void
gst_segment_set_stop (GstSegment * segment, gint64 running_time)
{
segment->stop = gst_segment_get_timestamp (segment, running_time);
segment->last_stop = -1;
}
static void
gst_segment_set_start (GstSegment * segment, gint64 running_time)
{
segment->start = gst_segment_get_timestamp (segment, running_time);
}
static void
gst_stream_selector_set_active_pad (GstStreamSelector * self,
const gchar * pad_name, gint64 stop_time, gint64 start_time)
{
GstPad *pad;
GstSelectorPad *old, *new;
GstPad **active_pad_p;
if (strcmp (pad_name, "") != 0)
pad = gst_element_get_pad (GST_ELEMENT (self), pad_name);
else
pad = NULL;
GST_OBJECT_LOCK (self);
if (pad == self->active_sinkpad)
goto done;
old = GST_SELECTOR_PAD_CAST (self->active_sinkpad);
new = GST_SELECTOR_PAD_CAST (pad);
if (old && old->active && !self->pending_stop && stop_time >= 0) {
/* schedule a last_stop update if one isn't already scheduled, and a
segment has been pushed before. */
memcpy (&self->pending_stop_segment, &old->segment,
sizeof (self->pending_stop_segment));
gst_segment_set_stop (&self->pending_stop_segment, stop_time);
self->pending_stop = TRUE;
}
if (new && new->active && start_time >= 0) {
/* schedule a new segment push */
gst_segment_set_start (&new->segment, start_time);
new->segment_pending = TRUE;
}
active_pad_p = &self->active_sinkpad;
gst_object_replace ((GstObject **) active_pad_p, GST_OBJECT_CAST (pad));
GST_DEBUG_OBJECT (self, "New active pad is %" GST_PTR_FORMAT,
self->active_sinkpad);
done:
GST_OBJECT_UNLOCK (self);
if (pad)
gst_object_unref (pad);
}
static void
gst_stream_selector_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstStreamSelector *sel = GST_STREAM_SELECTOR (object);
switch (prop_id) {
case PROP_ACTIVE_PAD:
gst_stream_selector_set_active_pad (sel,
g_value_get_string (value), GST_CLOCK_TIME_NONE, GST_CLOCK_TIME_NONE);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_stream_selector_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstStreamSelector *sel = GST_STREAM_SELECTOR (object);
switch (prop_id) {
case PROP_ACTIVE_PAD:{
GST_OBJECT_LOCK (object);
if (sel->active_sinkpad != NULL) {
g_value_take_string (value, gst_pad_get_name (sel->active_sinkpad));
} else {
g_value_set_string (value, "");
}
GST_OBJECT_UNLOCK (object);
break;
}
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstPad *
gst_stream_selector_get_linked_pad (GstPad * pad, gboolean strict)
{
GstStreamSelector *sel;
GstPad *otherpad = NULL;
sel = GST_STREAM_SELECTOR (gst_pad_get_parent (pad));
GST_OBJECT_LOCK (sel);
if (pad == sel->srcpad)
otherpad = sel->active_sinkpad;
else if (pad == sel->active_sinkpad || !strict)
otherpad = sel->srcpad;
if (otherpad)
gst_object_ref (otherpad);
GST_OBJECT_UNLOCK (sel);
gst_object_unref (sel);
return otherpad;
}
static GstCaps *
gst_stream_selector_getcaps (GstPad * pad)
{
GstPad *otherpad;
GstObject *parent;
GstCaps *caps;
otherpad = gst_stream_selector_get_linked_pad (pad, FALSE);
parent = gst_object_get_parent (GST_OBJECT (pad));
if (!otherpad) {
GST_DEBUG_OBJECT (parent,
"Pad %s:%s not linked, returning ANY", GST_DEBUG_PAD_NAME (pad));
caps = gst_caps_new_any ();
} else {
GST_DEBUG_OBJECT (parent,
"Pad %s:%s is linked (to %s:%s), returning peer caps",
GST_DEBUG_PAD_NAME (pad), GST_DEBUG_PAD_NAME (otherpad));
/* if the peer has caps, use those. If the pad is not linked, this function
* returns NULL and we return ANY */
if (!(caps = gst_pad_peer_get_caps (otherpad)))
caps = gst_caps_new_any ();
gst_object_unref (otherpad);
}
gst_object_unref (parent);
return caps;
}
/* check if the pad is the active sinkpad */
static gboolean
gst_stream_selector_is_active_sinkpad (GstStreamSelector * sel, GstPad * pad)
{
GstSelectorPad *selpad;
gboolean res;
selpad = GST_SELECTOR_PAD_CAST (pad);
GST_OBJECT_LOCK (sel);
res = (pad == sel->active_sinkpad);
GST_OBJECT_UNLOCK (sel);
return res;
}
/* Get or create the active sinkpad */
static GstPad *
gst_stream_selector_activate_sinkpad (GstStreamSelector * sel, GstPad * pad)
{
GstPad *active_sinkpad;
GstSelectorPad *selpad;
selpad = GST_SELECTOR_PAD_CAST (pad);
GST_OBJECT_LOCK (sel);
selpad->active = TRUE;
active_sinkpad = sel->active_sinkpad;
if (active_sinkpad == NULL) {
/* first pad we get an alloc on becomes the activated pad by default */
active_sinkpad = sel->active_sinkpad = gst_object_ref (pad);
GST_DEBUG_OBJECT (sel, "Activating pad %s:%s", GST_DEBUG_PAD_NAME (pad));
}
GST_OBJECT_UNLOCK (sel);
return active_sinkpad;
}
static GList *
gst_stream_selector_get_linked_pads (GstPad * pad)
{
GstPad *otherpad;
otherpad = gst_stream_selector_get_linked_pad (pad, TRUE);
if (!otherpad)
return NULL;
/* need to drop the ref, internal linked pads is not MT safe */
gst_object_unref (otherpad);
return g_list_append (NULL, otherpad);
}
static GstPad *
gst_stream_selector_request_new_pad (GstElement * element,
GstPadTemplate * templ, const gchar * unused)
{
GstStreamSelector *sel;
gchar *name = NULL;
GstPad *sinkpad = NULL;
sel = GST_STREAM_SELECTOR (element);
g_return_val_if_fail (templ->direction == GST_PAD_SINK, NULL);
GST_LOG_OBJECT (sel, "Creating new pad %d", sel->nb_sinkpads);
GST_OBJECT_LOCK (sel);
name = g_strdup_printf ("sink%d", sel->nb_sinkpads++);
sinkpad = g_object_new (GST_TYPE_SELECTOR_PAD,
"name", name, "direction", templ->direction, "template", templ, NULL);
g_free (name);
GST_OBJECT_UNLOCK (sel);
gst_pad_set_event_function (sinkpad,
GST_DEBUG_FUNCPTR (gst_selector_pad_event));
gst_pad_set_getcaps_function (sinkpad,
GST_DEBUG_FUNCPTR (gst_selector_pad_getcaps));
gst_pad_set_chain_function (sinkpad,
GST_DEBUG_FUNCPTR (gst_selector_pad_chain));
gst_pad_set_internal_link_function (sinkpad,
GST_DEBUG_FUNCPTR (gst_selector_pad_get_linked_pads));
gst_pad_set_bufferalloc_function (sinkpad,
GST_DEBUG_FUNCPTR (gst_selector_pad_bufferalloc));
gst_pad_set_active (sinkpad, TRUE);
gst_element_add_pad (GST_ELEMENT (sel), sinkpad);
return sinkpad;
}
static void
gst_stream_selector_release_pad (GstElement * element, GstPad * pad)
{
GstStreamSelector *sel;
sel = GST_STREAM_SELECTOR (element);
GST_LOG_OBJECT (sel, "Releasing pad %s:%s", GST_DEBUG_PAD_NAME (pad));
GST_OBJECT_LOCK (sel);
/* if the pad was the active pad, makes us select a new one */
if (sel->active_sinkpad == pad) {
GST_DEBUG_OBJECT (sel, "Deactivating pad %s:%s", GST_DEBUG_PAD_NAME (pad));
sel->active_sinkpad = NULL;
}
GST_OBJECT_UNLOCK (sel);
gst_pad_set_active (pad, FALSE);
gst_element_remove_pad (GST_ELEMENT (sel), pad);
}
static GstStateChangeReturn
gst_stream_selector_change_state (GstElement * element,
GstStateChange transition)
{
GstStreamSelector *self = GST_STREAM_SELECTOR (element);
GstStateChangeReturn result;
result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
if (transition == GST_STATE_CHANGE_PAUSED_TO_READY) {
GST_OBJECT_LOCK (self);
self->blocked = FALSE;
g_cond_broadcast (self->blocked_cond);
GST_OBJECT_UNLOCK (self);
}
return result;
}
static gint64
gst_stream_selector_block (GstStreamSelector * self)
{
gint64 ret = 0;
GstSelectorPad *spad;
GST_OBJECT_LOCK (self);
if (self->blocked)
GST_WARNING_OBJECT (self, "switch already blocked");
self->blocked = TRUE;
spad = GST_SELECTOR_PAD_CAST (self->active_sinkpad);
if (self->active_sinkpad)
ret = gst_selector_pad_get_running_time (spad);
else
GST_DEBUG_OBJECT (self, "no active pad while blocking");
GST_OBJECT_UNLOCK (self);
return ret;
}
static void
gst_stream_selector_push_pending_stop (GstStreamSelector * self)
{
GstEvent *event = NULL;
GST_OBJECT_LOCK (self);
if (G_UNLIKELY (self->pending_stop)) {
GstSegment *seg = &self->pending_stop_segment;
event = gst_event_new_new_segment_full (TRUE, seg->rate,
seg->applied_rate, seg->format, seg->start, seg->stop, seg->stop);
self->pending_stop = FALSE;
}
GST_OBJECT_UNLOCK (self);
if (event)
gst_pad_push_event (self->srcpad, event);
}
/* stop_time and start_time are running times */
static void
gst_stream_selector_switch (GstStreamSelector * self, const gchar * pad_name,
gint64 stop_time, gint64 start_time)
{
g_return_if_fail (self->blocked == TRUE);
gst_stream_selector_set_active_pad (self, pad_name, stop_time, start_time);
GST_OBJECT_LOCK (self);
self->blocked = FALSE;
g_cond_broadcast (self->blocked_cond);
GST_OBJECT_UNLOCK (self);
}
static gboolean
plugin_init (GstPlugin * plugin)
{
return gst_element_register (plugin, "switch", GST_RANK_NONE,
GST_TYPE_STREAM_SELECTOR);
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"switch",
"N-to-1 input switching",
plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)