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gstreamer/gst/selector/gstinputselector.c
Kipp Cannon 7e067615ff inputselector: Protect g_object_notify() with the object's mutex 
This works around the thread unsafety of g_object_notify()

Fixes bug #607513.
2010-01-24 20:53:56 +01:00

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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>
* Copyright (C) 2008 Nokia Corporation. (contact <stefan.kost@nokia.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.
*/
/**
* SECTION:element-input-selector
* @see_also: #GstOutputSelector
*
* Direct one out of N input streams to the output pad.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include "gstinputselector.h"
#include "gstselector-marshal.h"
GST_DEBUG_CATEGORY_STATIC (input_selector_debug);
#define GST_CAT_DEFAULT input_selector_debug
static const GstElementDetails gst_input_selector_details =
GST_ELEMENT_DETAILS ("Input selector",
"Generic",
"N-to-1 input stream selectoring",
"Julien Moutte <julien@moutte.net>\n"
"Jan Schmidt <thaytan@mad.scientist.com>\n"
"Wim Taymans <wim.taymans@gmail.com>");
static GstStaticPadTemplate gst_input_selector_sink_factory =
GST_STATIC_PAD_TEMPLATE ("sink%d",
GST_PAD_SINK,
GST_PAD_REQUEST,
GST_STATIC_CAPS_ANY);
static GstStaticPadTemplate gst_input_selector_src_factory =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
enum
{
PROP_0,
PROP_N_PADS,
PROP_ACTIVE_PAD,
PROP_SELECT_ALL,
PROP_LAST
};
#define DEFAULT_PAD_ALWAYS_OK TRUE
enum
{
PROP_PAD_0,
PROP_PAD_RUNNING_TIME,
PROP_PAD_TAGS,
PROP_PAD_ACTIVE,
PROP_PAD_ALWAYS_OK,
PROP_PAD_LAST
};
enum
{
/* methods */
SIGNAL_BLOCK,
SIGNAL_SWITCH,
LAST_SIGNAL
};
static guint gst_input_selector_signals[LAST_SIGNAL] = { 0 };
static inline gboolean gst_input_selector_is_active_sinkpad (GstInputSelector *
sel, GstPad * pad);
static GstPad *gst_input_selector_activate_sinkpad (GstInputSelector * sel,
GstPad * pad);
static GstPad *gst_input_selector_get_linked_pad (GstPad * pad,
gboolean strict);
static gboolean gst_input_selector_check_eos (GstElement * selector);
#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; /* when buffer have passed the pad */
gboolean eos; /* when EOS has been received */
gboolean discont; /* after switching we create a discont */
gboolean always_ok;
GstSegment segment; /* the current segment on the pad */
GstTagList *tags; /* last tags received on the pad */
gboolean segment_pending;
};
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 void gst_selector_pad_set_property (GObject * object,
guint prop_id, const 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 gboolean gst_selector_pad_acceptcaps (GstPad * pad, GstCaps * caps);
static GstIterator *gst_selector_pad_iterate_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, "GstSelectorPad",
&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->finalize = gst_selector_pad_finalize;
gobject_class->get_property = gst_selector_pad_get_property;
gobject_class->set_property = gst_selector_pad_set_property;
g_object_class_install_property (gobject_class, PROP_PAD_RUNNING_TIME,
g_param_spec_int64 ("running-time", "Running time",
"Running time of stream on pad", 0, G_MAXINT64, 0, G_PARAM_READABLE));
g_object_class_install_property (gobject_class, PROP_PAD_TAGS,
g_param_spec_boxed ("tags", "Tags",
"The currently active tags on the pad", GST_TYPE_TAG_LIST,
G_PARAM_READABLE));
g_object_class_install_property (gobject_class, PROP_PAD_ACTIVE,
g_param_spec_boolean ("active", "Active",
"If the pad is currently active", FALSE, G_PARAM_READABLE));
g_object_class_install_property (gobject_class, PROP_PAD_ALWAYS_OK,
g_param_spec_boolean ("always-ok", "Always OK",
"Make an inactive pad return OK instead of NOT_LINKED",
DEFAULT_PAD_ALWAYS_OK, G_PARAM_READWRITE));
}
static void
gst_selector_pad_init (GstSelectorPad * pad)
{
pad->always_ok = DEFAULT_PAD_ALWAYS_OK;
gst_selector_pad_reset (pad);
}
static void
gst_selector_pad_finalize (GObject * object)
{
GstSelectorPad *pad;
pad = GST_SELECTOR_PAD_CAST (object);
if (pad->tags)
gst_tag_list_free (pad->tags);
G_OBJECT_CLASS (selector_pad_parent_class)->finalize (object);
}
static void
gst_selector_pad_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstSelectorPad *spad = GST_SELECTOR_PAD_CAST (object);
switch (prop_id) {
case PROP_PAD_ALWAYS_OK:
GST_OBJECT_LOCK (object);
spad->always_ok = g_value_get_boolean (value);
GST_OBJECT_UNLOCK (object);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
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 PROP_PAD_RUNNING_TIME:
g_value_set_int64 (value, gst_selector_pad_get_running_time (spad));
break;
case PROP_PAD_TAGS:
GST_OBJECT_LOCK (object);
g_value_set_boxed (value, spad->tags);
GST_OBJECT_UNLOCK (object);
break;
case PROP_PAD_ACTIVE:
{
GstInputSelector *sel;
sel = GST_INPUT_SELECTOR (gst_pad_get_parent (spad));
g_value_set_boolean (value, gst_input_selector_is_active_sinkpad (sel,
GST_PAD_CAST (spad)));
gst_object_unref (sel);
break;
}
case PROP_PAD_ALWAYS_OK:
GST_OBJECT_LOCK (object);
g_value_set_boolean (value, spad->always_ok);
GST_OBJECT_UNLOCK (object);
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)
{
GST_OBJECT_LOCK (pad);
pad->active = FALSE;
pad->eos = FALSE;
pad->segment_pending = FALSE;
pad->discont = FALSE;
gst_segment_init (&pad->segment, GST_FORMAT_UNDEFINED);
GST_OBJECT_UNLOCK (pad);
}
/* strictly get the linked pad from the sinkpad. If the pad is active we return
* the srcpad else we return NULL */
static GstIterator *
gst_selector_pad_iterate_linked_pads (GstPad * pad)
{
GstInputSelector *sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
GstPad *otherpad;
GstIterator *it;
otherpad = gst_input_selector_get_linked_pad (pad, TRUE);
it = gst_iterator_new_single (GST_TYPE_PAD, otherpad,
(GstCopyFunction) gst_object_ref, (GFreeFunc) gst_object_unref);
if (otherpad)
gst_object_unref (otherpad);
gst_object_unref (sel);
return it;
}
static gboolean
gst_selector_pad_event (GstPad * pad, GstEvent * event)
{
gboolean res = TRUE;
gboolean forward = TRUE;
GstInputSelector *sel;
GstSelectorPad *selpad;
GstPad *prev_active_sinkpad;
GstPad *active_sinkpad;
sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
selpad = GST_SELECTOR_PAD_CAST (pad);
GST_INPUT_SELECTOR_LOCK (sel);
prev_active_sinkpad = sel->active_sinkpad;
active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad);
/* only forward if we are dealing with the active sinkpad or if select_all
* is enabled */
if (pad != active_sinkpad && !sel->select_all)
forward = FALSE;
if (prev_active_sinkpad != active_sinkpad && pad == active_sinkpad)
g_object_notify (G_OBJECT (sel), "active-pad");
GST_INPUT_SELECTOR_UNLOCK (sel);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_START:
/* FIXME, flush out the waiter */
break;
case GST_EVENT_FLUSH_STOP:
GST_INPUT_SELECTOR_LOCK (sel);
gst_selector_pad_reset (selpad);
sel->pending_close = FALSE;
GST_INPUT_SELECTOR_UNLOCK (sel);
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 (pad,
"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_INPUT_SELECTOR_LOCK (sel);
GST_OBJECT_LOCK (selpad);
gst_segment_set_newsegment_full (&selpad->segment, update,
rate, arate, format, start, stop, time);
GST_OBJECT_UNLOCK (selpad);
/* If we aren't forwarding the event (because the pad is not the
* active_sinkpad, and select_all is not set, then set the flag on the
* that says a segment needs sending if/when that pad is activated.
* For all other cases, we send the event immediately, which makes
* sparse streams and other segment updates work correctly downstream.
*/
if (!forward)
selpad->segment_pending = TRUE;
GST_INPUT_SELECTOR_UNLOCK (sel);
break;
}
case GST_EVENT_TAG:
{
GstTagList *tags, *oldtags, *newtags;
gst_event_parse_tag (event, &tags);
GST_OBJECT_LOCK (selpad);
oldtags = selpad->tags;
newtags = gst_tag_list_merge (oldtags, tags, GST_TAG_MERGE_REPLACE);
selpad->tags = newtags;
if (oldtags)
gst_tag_list_free (oldtags);
GST_DEBUG_OBJECT (pad, "received tags %" GST_PTR_FORMAT, newtags);
GST_OBJECT_UNLOCK (selpad);
GST_INPUT_SELECTOR_LOCK (sel);
g_object_notify (G_OBJECT (selpad), "tags");
GST_INPUT_SELECTOR_UNLOCK (sel);
break;
}
case GST_EVENT_EOS:
selpad->eos = TRUE;
GST_DEBUG_OBJECT (pad, "received EOS");
/* don't forward eos in select_all mode until all sink pads have eos */
if (sel->select_all && !gst_input_selector_check_eos (GST_ELEMENT (sel))) {
forward = FALSE;
}
break;
default:
break;
}
if (forward) {
GST_DEBUG_OBJECT (pad, "forwarding event");
res = gst_pad_push_event (sel->srcpad, event);
} else
gst_event_unref (event);
gst_object_unref (sel);
return res;
}
static GstCaps *
gst_selector_pad_getcaps (GstPad * pad)
{
GstInputSelector *sel;
GstCaps *caps;
sel = GST_INPUT_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 gboolean
gst_selector_pad_acceptcaps (GstPad * pad, GstCaps * caps)
{
GstInputSelector *sel;
gboolean res;
sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
GST_DEBUG_OBJECT (sel, "Checking acceptcaps of srcpad peer");
res = gst_pad_peer_accept_caps (sel->srcpad, caps);
gst_object_unref (sel);
return res;
}
static GstFlowReturn
gst_selector_pad_bufferalloc (GstPad * pad, guint64 offset,
guint size, GstCaps * caps, GstBuffer ** buf)
{
GstInputSelector *sel;
GstFlowReturn result;
GstPad *active_sinkpad;
GstPad *prev_active_sinkpad;
GstSelectorPad *selpad;
sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
selpad = GST_SELECTOR_PAD_CAST (pad);
GST_DEBUG_OBJECT (pad, "received alloc");
GST_INPUT_SELECTOR_LOCK (sel);
prev_active_sinkpad = sel->active_sinkpad;
active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad);
if (pad != active_sinkpad)
goto not_active;
if (prev_active_sinkpad != active_sinkpad && pad == active_sinkpad)
g_object_notify (G_OBJECT (sel), "active-pad");
GST_INPUT_SELECTOR_UNLOCK (sel);
result = gst_pad_alloc_buffer (sel->srcpad, offset, size, caps, buf);
done:
gst_object_unref (sel);
return result;
/* ERRORS */
not_active:
{
GST_INPUT_SELECTOR_UNLOCK (sel);
/* unselected pad, perform fallback alloc or return unlinked when
* asked */
GST_OBJECT_LOCK (selpad);
if (selpad->always_ok) {
GST_DEBUG_OBJECT (pad, "Not selected, performing fallback allocation");
*buf = NULL;
result = GST_FLOW_OK;
} else {
GST_DEBUG_OBJECT (pad, "Not selected, return NOT_LINKED");
result = GST_FLOW_NOT_LINKED;
}
GST_OBJECT_UNLOCK (selpad);
goto done;
}
}
/* must be called with the SELECTOR_LOCK, will block while the pad is blocked
* or return TRUE when flushing */
static gboolean
gst_input_selector_wait (GstInputSelector * self, GstPad * pad)
{
while (self->blocked && !self->flushing) {
/* we can be unlocked here when we are shutting down (flushing) or when we
* get unblocked */
GST_INPUT_SELECTOR_WAIT (self);
}
return self->flushing;
}
static GstFlowReturn
gst_selector_pad_chain (GstPad * pad, GstBuffer * buf)
{
GstInputSelector *sel;
GstFlowReturn res;
GstPad *active_sinkpad;
GstPad *prev_active_sinkpad;
GstSelectorPad *selpad;
GstClockTime start_time;
GstSegment *seg;
GstEvent *close_event = NULL, *start_event = NULL;
GstCaps *caps;
sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
selpad = GST_SELECTOR_PAD_CAST (pad);
seg = &selpad->segment;
GST_INPUT_SELECTOR_LOCK (sel);
/* wait or check for flushing */
if (gst_input_selector_wait (sel, pad))
goto flushing;
GST_DEBUG_OBJECT (pad, "getting active pad");
prev_active_sinkpad = sel->active_sinkpad;
active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad);
/* update the segment on the srcpad */
start_time = GST_BUFFER_TIMESTAMP (buf);
if (GST_CLOCK_TIME_IS_VALID (start_time)) {
GST_DEBUG_OBJECT (pad, "received start time %" GST_TIME_FORMAT,
GST_TIME_ARGS (start_time));
if (GST_BUFFER_DURATION_IS_VALID (buf))
GST_DEBUG_OBJECT (pad, "received end time %" GST_TIME_FORMAT,
GST_TIME_ARGS (start_time + GST_BUFFER_DURATION (buf)));
GST_OBJECT_LOCK (pad);
gst_segment_set_last_stop (seg, seg->format, start_time);
GST_OBJECT_UNLOCK (pad);
}
/* Ignore buffers from pads except the selected one */
if (pad != active_sinkpad)
goto ignore;
if (G_UNLIKELY (sel->pending_close)) {
GstSegment *cseg = &sel->segment;
GST_DEBUG_OBJECT (sel,
"pushing close NEWSEGMENT update %d, rate %lf, applied rate %lf, "
"format %d, "
"%" G_GINT64_FORMAT " -- %" G_GINT64_FORMAT ", time %"
G_GINT64_FORMAT, TRUE, cseg->rate, cseg->applied_rate, cseg->format,
cseg->start, cseg->stop, cseg->time);
/* create update segment */
close_event = gst_event_new_new_segment_full (TRUE, cseg->rate,
cseg->applied_rate, cseg->format, cseg->start, cseg->stop, cseg->time);
sel->pending_close = FALSE;
}
/* if we have a pending segment, push it out now */
if (G_UNLIKELY (selpad->segment_pending)) {
GST_DEBUG_OBJECT (pad,
"pushing pending NEWSEGMENT update %d, rate %lf, applied rate %lf, "
"format %d, "
"%" G_GINT64_FORMAT " -- %" G_GINT64_FORMAT ", time %"
G_GINT64_FORMAT, FALSE, seg->rate, seg->applied_rate, seg->format,
seg->start, seg->stop, seg->time);
start_event = gst_event_new_new_segment_full (FALSE, seg->rate,
seg->applied_rate, seg->format, seg->start, seg->stop, seg->time);
selpad->segment_pending = FALSE;
}
if (prev_active_sinkpad != active_sinkpad && pad == active_sinkpad)
g_object_notify (G_OBJECT (sel), "active-pad");
GST_INPUT_SELECTOR_UNLOCK (sel);
if (close_event)
gst_pad_push_event (sel->srcpad, close_event);
if (start_event)
gst_pad_push_event (sel->srcpad, start_event);
if (selpad->discont) {
buf = gst_buffer_make_metadata_writable (buf);
GST_DEBUG_OBJECT (pad, "Marking discont buffer %p", buf);
GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_DISCONT);
selpad->discont = FALSE;
}
/* forward */
GST_DEBUG_OBJECT (pad, "Forwarding buffer %p from pad %s:%s", buf,
GST_DEBUG_PAD_NAME (pad));
if ((caps = GST_BUFFER_CAPS (buf))) {
if (GST_PAD_CAPS (sel->srcpad) != caps)
gst_pad_set_caps (sel->srcpad, caps);
}
res = gst_pad_push (sel->srcpad, buf);
done:
gst_object_unref (sel);
return res;
/* dropped buffers */
ignore:
{
GST_DEBUG_OBJECT (pad, "Pad not active, discard buffer %p", buf);
/* when we drop a buffer, we're creating a discont on this pad */
selpad->discont = TRUE;
GST_INPUT_SELECTOR_UNLOCK (sel);
gst_buffer_unref (buf);
/* figure out what to return upstream */
GST_OBJECT_LOCK (selpad);
if (selpad->always_ok)
res = GST_FLOW_OK;
else
res = GST_FLOW_NOT_LINKED;
GST_OBJECT_UNLOCK (selpad);
goto done;
}
flushing:
{
GST_DEBUG_OBJECT (pad, "We are flushing, discard buffer %p", buf);
GST_INPUT_SELECTOR_UNLOCK (sel);
gst_buffer_unref (buf);
res = GST_FLOW_WRONG_STATE;
goto done;
}
}
static void gst_input_selector_init (GstInputSelector * sel);
static void gst_input_selector_base_init (GstInputSelectorClass * klass);
static void gst_input_selector_class_init (GstInputSelectorClass * klass);
static void gst_input_selector_dispose (GObject * object);
static void gst_input_selector_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec);
static void gst_input_selector_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec);
static GstPad *gst_input_selector_request_new_pad (GstElement * element,
GstPadTemplate * templ, const gchar * unused);
static void gst_input_selector_release_pad (GstElement * element, GstPad * pad);
static GstStateChangeReturn gst_input_selector_change_state (GstElement *
element, GstStateChange transition);
static GstCaps *gst_input_selector_getcaps (GstPad * pad);
static gboolean gst_input_selector_event (GstPad * pad, GstEvent * event);
static gboolean gst_input_selector_query (GstPad * pad, GstQuery * query);
static gint64 gst_input_selector_block (GstInputSelector * self);
static void gst_input_selector_switch (GstInputSelector * self,
GstPad * pad, gint64 stop_time, gint64 start_time);
static GstElementClass *parent_class = NULL;
GType
gst_input_selector_get_type (void)
{
static GType input_selector_type = 0;
if (!input_selector_type) {
static const GTypeInfo input_selector_info = {
sizeof (GstInputSelectorClass),
(GBaseInitFunc) gst_input_selector_base_init,
NULL,
(GClassInitFunc) gst_input_selector_class_init,
NULL,
NULL,
sizeof (GstInputSelector),
0,
(GInstanceInitFunc) gst_input_selector_init,
};
input_selector_type =
g_type_register_static (GST_TYPE_ELEMENT,
"GstInputSelector", &input_selector_info, 0);
GST_DEBUG_CATEGORY_INIT (input_selector_debug,
"input-selector", 0, "An input stream selector element");
}
return input_selector_type;
}
static void
gst_input_selector_base_init (GstInputSelectorClass * klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
gst_element_class_set_details (element_class, &gst_input_selector_details);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_input_selector_sink_factory));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_input_selector_src_factory));
}
static void
gst_input_selector_class_init (GstInputSelectorClass * 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->dispose = gst_input_selector_dispose;
gobject_class->set_property = gst_input_selector_set_property;
gobject_class->get_property = gst_input_selector_get_property;
g_object_class_install_property (gobject_class, PROP_N_PADS,
g_param_spec_uint ("n-pads", "Number of Pads",
"The number of sink pads", 0, G_MAXUINT, 0, G_PARAM_READABLE));
g_object_class_install_property (gobject_class, PROP_ACTIVE_PAD,
g_param_spec_object ("active-pad", "Active pad",
"The currently active sink pad", GST_TYPE_PAD, G_PARAM_READWRITE));
g_object_class_install_property (gobject_class, PROP_SELECT_ALL,
g_param_spec_boolean ("select-all", "Select all mode",
"Forwards data from all input pads", FALSE, G_PARAM_READWRITE));
/**
* GstInputSelector::block:
* @inputselector: the #GstInputSelector
*
* 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_input_selector_signals[SIGNAL_BLOCK] =
g_signal_new ("block", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
G_STRUCT_OFFSET (GstInputSelectorClass, block), NULL, NULL,
gst_selector_marshal_INT64__VOID, G_TYPE_INT64, 0);
/**
* GstInputSelector::switch:
* @inputselector: the #GstInputSelector
* @pad: the 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="GstInputSelector-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="GstInputSelector-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.
*
* <note><simpara>
* the signal changed from accepting the pad name to the pad object.
* </simpara></note>
*
* Since: 0.10.7
*/
gst_input_selector_signals[SIGNAL_SWITCH] =
g_signal_new ("switch", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstInputSelectorClass, switch_),
NULL, NULL, gst_selector_marshal_VOID__OBJECT_INT64_INT64,
G_TYPE_NONE, 3, GST_TYPE_PAD, G_TYPE_INT64, G_TYPE_INT64);
gstelement_class->request_new_pad = gst_input_selector_request_new_pad;
gstelement_class->release_pad = gst_input_selector_release_pad;
gstelement_class->change_state = gst_input_selector_change_state;
klass->block = GST_DEBUG_FUNCPTR (gst_input_selector_block);
/* note the underscore because switch is a keyword otherwise */
klass->switch_ = GST_DEBUG_FUNCPTR (gst_input_selector_switch);
}
static void
gst_input_selector_init (GstInputSelector * sel)
{
sel->srcpad = gst_pad_new ("src", GST_PAD_SRC);
gst_pad_set_iterate_internal_links_function (sel->srcpad,
GST_DEBUG_FUNCPTR (gst_selector_pad_iterate_linked_pads));
gst_pad_set_getcaps_function (sel->srcpad,
GST_DEBUG_FUNCPTR (gst_input_selector_getcaps));
gst_pad_set_query_function (sel->srcpad,
GST_DEBUG_FUNCPTR (gst_input_selector_query));
gst_pad_set_event_function (sel->srcpad,
GST_DEBUG_FUNCPTR (gst_input_selector_event));
gst_element_add_pad (GST_ELEMENT (sel), sel->srcpad);
/* sinkpad management */
sel->active_sinkpad = NULL;
sel->padcount = 0;
gst_segment_init (&sel->segment, GST_FORMAT_UNDEFINED);
sel->lock = g_mutex_new ();
sel->cond = g_cond_new ();
sel->blocked = FALSE;
sel->select_all = FALSE;
}
static void
gst_input_selector_dispose (GObject * object)
{
GstInputSelector *sel = GST_INPUT_SELECTOR (object);
if (sel->active_sinkpad) {
gst_object_unref (sel->active_sinkpad);
sel->active_sinkpad = NULL;
}
if (sel->lock) {
g_mutex_free (sel->lock);
sel->lock = NULL;
}
if (sel->cond) {
g_cond_free (sel->cond);
sel->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)
{
if (running_time <= segment->accum)
return segment->start;
else
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)
{
gint64 new_start, duration;
new_start = gst_segment_get_timestamp (segment, running_time);
/* this is the duration we skipped */
duration = new_start - segment->start;
/* add the duration to the accumulated segment time */
segment->accum += duration;
/* move position in the segment */
segment->time += duration;
segment->start += duration;
}
/* this function must be called with the SELECTOR_LOCK. It returns TRUE when the
* active pad changed. */
static gboolean
gst_input_selector_set_active_pad (GstInputSelector * self,
GstPad * pad, gint64 stop_time, gint64 start_time)
{
GstSelectorPad *old, *new;
GstPad **active_pad_p;
if (pad == self->active_sinkpad)
return FALSE;
old = GST_SELECTOR_PAD_CAST (self->active_sinkpad);
new = GST_SELECTOR_PAD_CAST (pad);
GST_DEBUG_OBJECT (self, "setting active pad to %s:%s",
GST_DEBUG_PAD_NAME (new));
if (stop_time == -1 && old) {
/* no stop time given, get the latest running_time on the active pad to
* close and open the new segment */
stop_time = start_time = gst_selector_pad_get_running_time (old);
GST_DEBUG_OBJECT (self, "using start/stop of %" G_GINT64_FORMAT,
start_time);
}
if (old && old->active && !self->pending_close && stop_time >= 0) {
/* schedule a last_stop update if one isn't already scheduled, and a
segment has been pushed before. */
memcpy (&self->segment, &old->segment, sizeof (self->segment));
GST_DEBUG_OBJECT (self, "setting stop_time to %" G_GINT64_FORMAT,
stop_time);
gst_segment_set_stop (&self->segment, stop_time);
self->pending_close = TRUE;
}
if (new && new->active && start_time >= 0) {
GST_DEBUG_OBJECT (self, "setting start_time to %" G_GINT64_FORMAT,
start_time);
/* 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);
return TRUE;
}
static void
gst_input_selector_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstInputSelector *sel = GST_INPUT_SELECTOR (object);
switch (prop_id) {
case PROP_ACTIVE_PAD:
{
GstPad *pad;
pad = g_value_get_object (value);
GST_INPUT_SELECTOR_LOCK (sel);
gst_input_selector_set_active_pad (sel, pad,
GST_CLOCK_TIME_NONE, GST_CLOCK_TIME_NONE);
GST_INPUT_SELECTOR_UNLOCK (sel);
break;
}
case PROP_SELECT_ALL:
GST_INPUT_SELECTOR_LOCK (object);
sel->select_all = g_value_get_boolean (value);
GST_INPUT_SELECTOR_UNLOCK (object);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_input_selector_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstInputSelector *sel = GST_INPUT_SELECTOR (object);
switch (prop_id) {
case PROP_N_PADS:
GST_INPUT_SELECTOR_LOCK (object);
g_value_set_uint (value, sel->n_pads);
GST_INPUT_SELECTOR_UNLOCK (object);
break;
case PROP_ACTIVE_PAD:
GST_INPUT_SELECTOR_LOCK (object);
g_value_set_object (value, sel->active_sinkpad);
GST_INPUT_SELECTOR_UNLOCK (object);
break;
case PROP_SELECT_ALL:
GST_INPUT_SELECTOR_LOCK (object);
g_value_set_boolean (value, sel->select_all);
GST_INPUT_SELECTOR_UNLOCK (object);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstPad *
gst_input_selector_get_linked_pad (GstPad * pad, gboolean strict)
{
GstInputSelector *sel;
GstPad *otherpad = NULL;
sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
GST_INPUT_SELECTOR_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_INPUT_SELECTOR_UNLOCK (sel);
gst_object_unref (sel);
return otherpad;
}
static gboolean
gst_input_selector_event (GstPad * pad, GstEvent * event)
{
gboolean res = FALSE;
GstPad *otherpad;
otherpad = gst_input_selector_get_linked_pad (pad, TRUE);
if (otherpad) {
res = gst_pad_push_event (otherpad, event);
gst_object_unref (otherpad);
} else
gst_event_unref (event);
return res;
}
/* query on the srcpad. We override this function because by default it will
* only forward the query to one random sinkpad */
static gboolean
gst_input_selector_query (GstPad * pad, GstQuery * query)
{
gboolean res = TRUE;
GstInputSelector *sel;
GstPad *otherpad;
sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
otherpad = gst_input_selector_get_linked_pad (pad, TRUE);
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_LATENCY:
{
GList *walk;
GstClockTime resmin, resmax;
gboolean reslive;
resmin = 0;
resmax = -1;
reslive = FALSE;
/* assume FALSE, we become TRUE if one query succeeds */
res = FALSE;
/* perform the query on all sinkpads and combine the results. We take the
* max of min and the min of max for the result latency. */
GST_INPUT_SELECTOR_LOCK (sel);
for (walk = GST_ELEMENT_CAST (sel)->sinkpads; walk;
walk = g_list_next (walk)) {
GstPad *sinkpad = GST_PAD_CAST (walk->data);
if (gst_pad_peer_query (sinkpad, query)) {
GstClockTime min, max;
gboolean live;
/* one query succeeded, we succeed too */
res = TRUE;
gst_query_parse_latency (query, &live, &min, &max);
GST_DEBUG_OBJECT (sinkpad,
"peer latency min %" GST_TIME_FORMAT ", max %" GST_TIME_FORMAT
", live %d", GST_TIME_ARGS (min), GST_TIME_ARGS (max), live);
if (live) {
if (min > resmin)
resmin = min;
if (resmax == -1)
resmax = max;
else if (max < resmax)
resmax = max;
if (reslive == FALSE)
reslive = live;
}
}
}
GST_INPUT_SELECTOR_UNLOCK (sel);
if (res) {
gst_query_set_latency (query, reslive, resmin, resmax);
GST_DEBUG_OBJECT (sel,
"total latency min %" GST_TIME_FORMAT ", max %" GST_TIME_FORMAT
", live %d", GST_TIME_ARGS (resmin), GST_TIME_ARGS (resmax),
reslive);
}
break;
}
default:
if (otherpad)
res = gst_pad_peer_query (otherpad, query);
break;
}
if (otherpad)
gst_object_unref (otherpad);
gst_object_unref (sel);
return res;
}
static GstCaps *
gst_input_selector_getcaps (GstPad * pad)
{
GstPad *otherpad;
GstObject *parent;
GstCaps *caps;
parent = gst_object_get_parent (GST_OBJECT (pad));
otherpad = gst_input_selector_get_linked_pad (pad, FALSE);
if (!otherpad) {
if (GST_INPUT_SELECTOR (parent)->select_all) {
GST_DEBUG_OBJECT (parent,
"Pad %s:%s not linked, returning merge of caps",
GST_DEBUG_PAD_NAME (pad));
caps = gst_pad_proxy_getcaps (pad);
} else {
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 inline gboolean
gst_input_selector_is_active_sinkpad (GstInputSelector * sel, GstPad * pad)
{
gboolean res;
GST_INPUT_SELECTOR_LOCK (sel);
res = (pad == sel->active_sinkpad);
GST_INPUT_SELECTOR_UNLOCK (sel);
return res;
}
/* Get or create the active sinkpad, must be called with SELECTOR_LOCK */
static GstPad *
gst_input_selector_activate_sinkpad (GstInputSelector * sel, GstPad * pad)
{
GstPad *active_sinkpad;
GstSelectorPad *selpad;
selpad = GST_SELECTOR_PAD_CAST (pad);
selpad->active = TRUE;
active_sinkpad = sel->active_sinkpad;
if (active_sinkpad == NULL || sel->select_all) {
/* first pad we get activity on becomes the activated pad by default, if we
* select all, we also remember the last used pad. */
if (sel->active_sinkpad)
gst_object_unref (sel->active_sinkpad);
active_sinkpad = sel->active_sinkpad = gst_object_ref (pad);
GST_DEBUG_OBJECT (sel, "Activating pad %s:%s", GST_DEBUG_PAD_NAME (pad));
}
return active_sinkpad;
}
static GstPad *
gst_input_selector_request_new_pad (GstElement * element,
GstPadTemplate * templ, const gchar * unused)
{
GstInputSelector *sel;
gchar *name = NULL;
GstPad *sinkpad = NULL;
g_return_val_if_fail (templ->direction == GST_PAD_SINK, NULL);
sel = GST_INPUT_SELECTOR (element);
GST_INPUT_SELECTOR_LOCK (sel);
GST_LOG_OBJECT (sel, "Creating new pad %d", sel->padcount);
name = g_strdup_printf ("sink%d", sel->padcount++);
sinkpad = g_object_new (GST_TYPE_SELECTOR_PAD,
"name", name, "direction", templ->direction, "template", templ, NULL);
g_free (name);
sel->n_pads++;
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_acceptcaps_function (sinkpad,
GST_DEBUG_FUNCPTR (gst_selector_pad_acceptcaps));
gst_pad_set_chain_function (sinkpad,
GST_DEBUG_FUNCPTR (gst_selector_pad_chain));
gst_pad_set_iterate_internal_links_function (sinkpad,
GST_DEBUG_FUNCPTR (gst_selector_pad_iterate_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);
GST_INPUT_SELECTOR_UNLOCK (sel);
return sinkpad;
}
static void
gst_input_selector_release_pad (GstElement * element, GstPad * pad)
{
GstInputSelector *sel;
sel = GST_INPUT_SELECTOR (element);
GST_LOG_OBJECT (sel, "Releasing pad %s:%s", GST_DEBUG_PAD_NAME (pad));
GST_INPUT_SELECTOR_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));
gst_object_unref (sel->active_sinkpad);
sel->active_sinkpad = NULL;
}
sel->n_pads--;
gst_pad_set_active (pad, FALSE);
gst_element_remove_pad (GST_ELEMENT (sel), pad);
GST_INPUT_SELECTOR_UNLOCK (sel);
}
static void
gst_input_selector_reset (GstInputSelector * sel)
{
GList *walk;
GST_INPUT_SELECTOR_LOCK (sel);
/* clear active pad */
if (sel->active_sinkpad) {
gst_object_unref (sel->active_sinkpad);
sel->active_sinkpad = NULL;
}
/* reset segment */
gst_segment_init (&sel->segment, GST_FORMAT_UNDEFINED);
sel->pending_close = FALSE;
/* reset each of our sinkpads state */
for (walk = GST_ELEMENT_CAST (sel)->sinkpads; walk; walk = g_list_next (walk)) {
GstSelectorPad *selpad = GST_SELECTOR_PAD_CAST (walk->data);
gst_selector_pad_reset (selpad);
if (selpad->tags) {
gst_tag_list_free (selpad->tags);
selpad->tags = NULL;
}
}
GST_INPUT_SELECTOR_UNLOCK (sel);
}
static GstStateChangeReturn
gst_input_selector_change_state (GstElement * element,
GstStateChange transition)
{
GstInputSelector *self = GST_INPUT_SELECTOR (element);
GstStateChangeReturn result;
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:
GST_INPUT_SELECTOR_LOCK (self);
self->blocked = FALSE;
self->flushing = FALSE;
GST_INPUT_SELECTOR_UNLOCK (self);
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
/* first unlock before we call the parent state change function, which
* tries to acquire the stream lock when going to ready. */
GST_INPUT_SELECTOR_LOCK (self);
self->blocked = FALSE;
self->flushing = TRUE;
GST_INPUT_SELECTOR_BROADCAST (self);
GST_INPUT_SELECTOR_UNLOCK (self);
break;
default:
break;
}
result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
gst_input_selector_reset (self);
break;
default:
break;
}
return result;
}
static gint64
gst_input_selector_block (GstInputSelector * self)
{
gint64 ret = 0;
GstSelectorPad *spad;
GST_INPUT_SELECTOR_LOCK (self);
if (self->blocked)
GST_WARNING_OBJECT (self, "switch already blocked");
self->blocked = TRUE;
spad = GST_SELECTOR_PAD_CAST (self->active_sinkpad);
if (spad)
ret = gst_selector_pad_get_running_time (spad);
else
GST_DEBUG_OBJECT (self, "no active pad while blocking");
GST_INPUT_SELECTOR_UNLOCK (self);
return ret;
}
/* stop_time and start_time are running times */
static void
gst_input_selector_switch (GstInputSelector * self, GstPad * pad,
gint64 stop_time, gint64 start_time)
{
gboolean changed;
g_return_if_fail (self->blocked == TRUE);
GST_INPUT_SELECTOR_LOCK (self);
changed =
gst_input_selector_set_active_pad (self, pad, stop_time, start_time);
self->blocked = FALSE;
GST_INPUT_SELECTOR_BROADCAST (self);
if (changed)
g_object_notify (G_OBJECT (self), "active-pad");
GST_INPUT_SELECTOR_UNLOCK (self);
}
static gboolean
gst_input_selector_check_eos (GstElement * selector)
{
GstIterator *it = gst_element_iterate_sink_pads (selector);
GstIteratorResult ires;
gpointer item;
gboolean done = FALSE, is_eos = FALSE;
GstSelectorPad *pad;
while (!done) {
ires = gst_iterator_next (it, &item);
switch (ires) {
case GST_ITERATOR_DONE:
GST_INFO_OBJECT (selector, "all sink pads have eos");
done = TRUE;
is_eos = TRUE;
break;
case GST_ITERATOR_OK:
pad = GST_SELECTOR_PAD_CAST (item);
if (!pad->eos) {
done = TRUE;
}
gst_object_unref (pad);
break;
case GST_ITERATOR_RESYNC:
gst_iterator_resync (it);
break;
default:
done = TRUE;
break;
}
}
gst_iterator_free (it);
return is_eos;
}
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