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gstreamer/plugins/elements/gstinputselector.c

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/* GStreamer input selector
* 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>)
* Copyright (C) 2011 Sebastian Dröge <sebastian.droege@collabora.co.uk>
*
* 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.
*
* The input pads are from a GstPad subclass and have additional
* properties, which users may find useful, namely:
*
* <itemizedlist>
* <listitem>
* "running-time": Running time of stream on pad (#gint64)
* </listitem>
* <listitem>
* "tags": The currently active tags on the pad (#GstTagList, boxed type)
* </listitem>
* <listitem>
* "active": If the pad is currently active (#gboolean)
* </listitem>
* <listitem>
* "always-ok" : Make an inactive pads return #GST_FLOW_OK instead of
* #GST_FLOW_NOT_LINKED
* </listitem>
* </itemizedlist>
*
* Since: 0.10.32
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include "gstinputselector.h"
GST_DEBUG_CATEGORY_STATIC (input_selector_debug);
#define GST_CAT_DEFAULT input_selector_debug
#if GLIB_CHECK_VERSION(2, 26, 0)
#define NOTIFY_MUTEX_LOCK()
#define NOTIFY_MUTEX_UNLOCK()
#else
static GStaticRecMutex notify_mutex = G_STATIC_REC_MUTEX_INIT;
#define NOTIFY_MUTEX_LOCK() g_static_rec_mutex_lock (&notify_mutex)
#define NOTIFY_MUTEX_UNLOCK() g_static_rec_mutex_unlock (&notify_mutex)
#endif
#define GST_INPUT_SELECTOR_GET_LOCK(sel) (((GstInputSelector*)(sel))->lock)
#define GST_INPUT_SELECTOR_GET_COND(sel) (((GstInputSelector*)(sel))->cond)
#define GST_INPUT_SELECTOR_LOCK(sel) (g_mutex_lock (GST_INPUT_SELECTOR_GET_LOCK(sel)))
#define GST_INPUT_SELECTOR_UNLOCK(sel) (g_mutex_unlock (GST_INPUT_SELECTOR_GET_LOCK(sel)))
#define GST_INPUT_SELECTOR_WAIT(sel) (g_cond_wait (GST_INPUT_SELECTOR_GET_COND(sel), \
GST_INPUT_SELECTOR_GET_LOCK(sel)))
#define GST_INPUT_SELECTOR_BROADCAST(sel) (g_cond_broadcast (GST_INPUT_SELECTOR_GET_COND(sel)))
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_SYNC_STREAMS
};
#define DEFAULT_SYNC_STREAMS FALSE
#define DEFAULT_PAD_ALWAYS_OK TRUE
enum
{
PROP_PAD_0,
PROP_PAD_RUNNING_TIME,
PROP_PAD_TAGS,
PROP_PAD_ACTIVE,
PROP_PAD_ALWAYS_OK
};
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 (GstInputSelector * sel,
GstPad * pad, gboolean strict);
#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 pushed; /* when buffer was pushed downstream since activation */
gboolean eos; /* when EOS has been received */
gboolean eos_sent; /* when EOS was sent downstream */
gboolean discont; /* after switching we create a discont */
gboolean flushing; /* set after flush-start and before flush-stop */
gboolean always_ok;
GstTagList *tags; /* last tags received on the pad */
GstClockTime position; /* the current position in the segment */
GstSegment segment; /* the current segment on the pad */
guint32 segment_seqnum; /* sequence number of the current segment */
gboolean segment_pending;
};
struct _GstSelectorPadClass
{
GstPadClass parent;
};
GType gst_selector_pad_get_type (void);
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 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, GstCaps * filter);
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);
G_DEFINE_TYPE (GstSelectorPad, gst_selector_pad, GST_TYPE_PAD);
static void
gst_selector_pad_class_init (GstSelectorPadClass * klass)
{
GObjectClass *gobject_class;
gobject_class = (GObjectClass *) 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_PARAM_STATIC_STRINGS));
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_PARAM_STATIC_STRINGS));
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_PARAM_STATIC_STRINGS));
/* FIXME: better property name? */
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 | G_PARAM_STATIC_STRINGS));
}
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 (gst_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) {
guint64 position = pad->position;
GstFormat format = pad->segment.format;
ret = gst_segment_to_running_time (&pad->segment, format, position);
}
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->pushed = FALSE;
pad->eos = FALSE;
pad->eos_sent = FALSE;
pad->segment_pending = FALSE;
pad->discont = FALSE;
pad->flushing = FALSE;
pad->position = GST_CLOCK_TIME_NONE;
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;
GstPad *otherpad;
GstIterator *it;
GValue val = { 0, };
sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
if (G_UNLIKELY (sel == NULL))
return NULL;
otherpad = gst_input_selector_get_linked_pad (sel, pad, TRUE);
g_value_init (&val, GST_TYPE_PAD);
g_value_set_object (&val, otherpad);
it = gst_iterator_new_single (GST_TYPE_PAD, &val);
g_value_unset (&val);
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;
GstInputSelector *sel;
GstSelectorPad *selpad;
GstPad *prev_active_sinkpad;
GstPad *active_sinkpad;
sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
if (G_UNLIKELY (sel == NULL)) {
gst_event_unref (event);
return FALSE;
}
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 */
forward = (pad == active_sinkpad);
GST_INPUT_SELECTOR_UNLOCK (sel);
if (prev_active_sinkpad != active_sinkpad && pad == active_sinkpad) {
NOTIFY_MUTEX_LOCK ();
g_object_notify (G_OBJECT (sel), "active-pad");
NOTIFY_MUTEX_UNLOCK ();
}
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_START:
/* Unblock the pad if it's waiting */
GST_INPUT_SELECTOR_LOCK (sel);
selpad->flushing = TRUE;
GST_INPUT_SELECTOR_BROADCAST (sel);
GST_INPUT_SELECTOR_UNLOCK (sel);
break;
case GST_EVENT_FLUSH_STOP:
GST_INPUT_SELECTOR_LOCK (sel);
gst_selector_pad_reset (selpad);
GST_INPUT_SELECTOR_UNLOCK (sel);
break;
case GST_EVENT_SEGMENT:
{
GST_INPUT_SELECTOR_LOCK (sel);
GST_OBJECT_LOCK (selpad);
gst_event_copy_segment (event, &selpad->segment);
selpad->segment_seqnum = gst_event_get_seqnum (event);
/* Update the position */
if (selpad->position == GST_CLOCK_TIME_NONE
|| selpad->segment.position > selpad->position) {
selpad->position = selpad->segment.position;
} else if (selpad->position != GST_CLOCK_TIME_NONE
&& selpad->position > selpad->segment.position) {
selpad->segment.position = selpad->position;
if (forward) {
gst_event_unref (event);
event = gst_event_new_segment (&selpad->segment);
gst_event_set_seqnum (event, selpad->segment_seqnum);
}
}
GST_DEBUG_OBJECT (pad, "configured SEGMENT %" GST_SEGMENT_FORMAT,
&selpad->segment);
/* If we aren't forwarding the event because the pad is not the
* active_sinkpad, then set the flag on the pad
* 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_OBJECT_UNLOCK (selpad);
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);
g_object_notify (G_OBJECT (selpad), "tags");
break;
}
case GST_EVENT_EOS:
selpad->eos = TRUE;
if (forward) {
selpad->eos_sent = TRUE;
} else {
GstSelectorPad *tmp;
/* If the active sinkpad is in EOS state but EOS
* was not sent downstream this means that the pad
* got EOS before it was set as active pad and that
* the previously active pad got EOS after it was
* active
*/
GST_INPUT_SELECTOR_LOCK (sel);
active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad);
tmp = GST_SELECTOR_PAD (active_sinkpad);
forward = (tmp->eos && !tmp->eos_sent);
tmp->eos_sent = TRUE;
GST_INPUT_SELECTOR_UNLOCK (sel);
}
GST_DEBUG_OBJECT (pad, "received EOS");
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, GstCaps * filter)
{
GstInputSelector *sel;
GstCaps *caps;
sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
if (G_UNLIKELY (sel == NULL))
return (filter ? gst_caps_ref (filter) : gst_caps_new_any ());
GST_DEBUG_OBJECT (sel, "Getting caps of srcpad peer");
caps = gst_pad_peer_get_caps (sel->srcpad, filter);
if (caps == NULL)
caps = (filter ? gst_caps_ref (filter) : 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));
if (G_UNLIKELY (sel == NULL))
return FALSE;
GST_DEBUG_OBJECT (sel, "Checking acceptcaps of srcpad peer");
res = gst_pad_peer_accept_caps (sel->srcpad, caps);
gst_object_unref (sel);
return res;
}
/* 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, GstSelectorPad * pad)
{
while (self->blocked && !self->flushing && !pad->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;
}
/* must be called with the SELECTOR_LOCK, will block until the running time
* of the active pad is after this pad or return TRUE when flushing */
static gboolean
gst_input_selector_wait_running_time (GstInputSelector * sel,
GstSelectorPad * pad, GstBuffer * buf)
{
GstPad *active_sinkpad;
GstSelectorPad *active_selpad;
GstSegment *seg, *active_seg;
GstClockTime running_time, active_running_time = -1;
seg = &pad->segment;
active_sinkpad =
gst_input_selector_activate_sinkpad (sel, GST_PAD_CAST (pad));
active_selpad = GST_SELECTOR_PAD_CAST (active_sinkpad);
active_seg = &active_selpad->segment;
/* We can only sync if the segments are in time format or
* if the active pad had no newsegment event yet */
if (seg->format != GST_FORMAT_TIME ||
(active_seg->format != GST_FORMAT_TIME
&& active_seg->format != GST_FORMAT_UNDEFINED))
return FALSE;
/* If we have no valid timestamp we can't sync this buffer */
if (!GST_BUFFER_TIMESTAMP_IS_VALID (buf))
return FALSE;
running_time = GST_BUFFER_TIMESTAMP (buf);
/* If possible try to get the running time at the end of the buffer */
if (GST_BUFFER_DURATION_IS_VALID (buf))
running_time += GST_BUFFER_DURATION (buf);
if (running_time > seg->stop)
running_time = seg->stop;
running_time =
gst_segment_to_running_time (seg, GST_FORMAT_TIME, running_time);
/* If this is outside the segment don't sync */
if (running_time == -1)
return FALSE;
/* Get active pad's running time, if no configured segment yet keep at -1 */
if (active_seg->format == GST_FORMAT_TIME)
active_running_time =
gst_segment_to_running_time (active_seg, GST_FORMAT_TIME,
active_selpad->position);
/* Wait until
* a) this is the active pad
* b) the pad or the selector is flushing
* c) the selector is not blocked
* d) the active pad has no running time or the active
* pad's running time is before this running time
* e) the active pad has a non-time segment
*/
while (pad != active_selpad && !sel->flushing && !pad->flushing &&
(sel->blocked || active_running_time == -1
|| running_time >= active_running_time)) {
if (!sel->blocked)
GST_DEBUG_OBJECT (pad,
"Waiting for active streams to advance. %" GST_TIME_FORMAT " >= %"
GST_TIME_FORMAT, GST_TIME_ARGS (running_time),
GST_TIME_ARGS (active_running_time));
GST_INPUT_SELECTOR_WAIT (sel);
/* Get new active pad, it might have changed */
active_sinkpad =
gst_input_selector_activate_sinkpad (sel, GST_PAD_CAST (pad));
active_selpad = GST_SELECTOR_PAD_CAST (active_sinkpad);
active_seg = &active_selpad->segment;
/* If the active segment is configured but not to time format
* we can't do any syncing at all */
if (active_seg->format != GST_FORMAT_TIME
&& active_seg->format != GST_FORMAT_UNDEFINED)
break;
/* Get the new active pad running time */
if (active_seg->format == GST_FORMAT_TIME)
active_running_time =
gst_segment_to_running_time (active_seg, GST_FORMAT_TIME,
active_selpad->position);
else
active_running_time = -1;
if (!sel->blocked)
GST_DEBUG_OBJECT (pad,
"Waited for active streams to advance. %" GST_TIME_FORMAT " >= %"
GST_TIME_FORMAT, GST_TIME_ARGS (running_time),
GST_TIME_ARGS (active_running_time));
}
/* Return TRUE if the selector or the pad is flushing */
return (sel->flushing || pad->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 *start_event = NULL;
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, selpad))
goto flushing;
GST_LOG_OBJECT (pad, "getting active pad");
prev_active_sinkpad = sel->active_sinkpad;
active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad);
/* In sync mode wait until the active pad has advanced
* after the running time of the current buffer */
if (sel->sync_streams && active_sinkpad != pad) {
if (gst_input_selector_wait_running_time (sel, selpad, buf))
goto flushing;
}
/* Might have changed while waiting */
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_LOG_OBJECT (pad, "received start time %" GST_TIME_FORMAT,
GST_TIME_ARGS (start_time));
if (GST_BUFFER_DURATION_IS_VALID (buf))
GST_LOG_OBJECT (pad, "received end time %" GST_TIME_FORMAT,
GST_TIME_ARGS (start_time + GST_BUFFER_DURATION (buf)));
GST_OBJECT_LOCK (pad);
selpad->position = start_time;
GST_OBJECT_UNLOCK (pad);
}
/* Ignore buffers from pads except the selected one */
if (pad != active_sinkpad)
goto ignore;
/* Tell all non-active pads that we advanced the running time */
if (sel->sync_streams)
GST_INPUT_SELECTOR_BROADCAST (sel);
/* if we have a pending segment, push it out now */
if (G_UNLIKELY (prev_active_sinkpad != active_sinkpad
|| 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_segment (seg);
gst_event_set_seqnum (start_event, selpad->segment_seqnum);
selpad->segment_pending = FALSE;
}
GST_INPUT_SELECTOR_UNLOCK (sel);
if (prev_active_sinkpad != active_sinkpad && pad == active_sinkpad) {
NOTIFY_MUTEX_LOCK ();
g_object_notify (G_OBJECT (sel), "active-pad");
NOTIFY_MUTEX_UNLOCK ();
}
if (start_event)
gst_pad_push_event (sel->srcpad, start_event);
if (selpad->discont) {
buf = gst_buffer_make_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_LOG_OBJECT (pad, "Forwarding buffer %p", buf);
res = gst_pad_push (sel->srcpad, buf);
selpad->pushed = TRUE;
done:
gst_object_unref (sel);
return res;
/* dropped buffers */
ignore:
{
gboolean active_pad_pushed = GST_SELECTOR_PAD_CAST (active_sinkpad)->pushed;
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 || !active_pad_pushed)
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_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, const GstCaps * caps);
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, GstCaps * filter);
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);
/* FIXME: create these marshallers using glib-genmarshal */
static void
gst_input_selector_marshal_INT64__VOID (GClosure * closure,
GValue * return_value G_GNUC_UNUSED,
guint n_param_values,
const GValue * param_values,
gpointer invocation_hint G_GNUC_UNUSED, gpointer marshal_data)
{
typedef gint64 (*GMarshalFunc_INT64__VOID) (gpointer data1, gpointer data2);
register GMarshalFunc_INT64__VOID callback;
register GCClosure *cc = (GCClosure *) closure;
register gpointer data1, data2;
gint64 v_return;
g_return_if_fail (return_value != NULL);
g_return_if_fail (n_param_values == 1);
if (G_CCLOSURE_SWAP_DATA (closure)) {
data1 = closure->data;
data2 = g_value_peek_pointer (param_values + 0);
} else {
data1 = g_value_peek_pointer (param_values + 0);
data2 = closure->data;
}
callback =
(GMarshalFunc_INT64__VOID) (marshal_data ? marshal_data : cc->callback);
v_return = callback (data1, data2);
g_value_set_int64 (return_value, v_return);
}
#define _do_init \
GST_DEBUG_CATEGORY_INIT (input_selector_debug, \
"input-selector", 0, "An input stream selector element");
#define gst_input_selector_parent_class parent_class
G_DEFINE_TYPE_WITH_CODE (GstInputSelector, gst_input_selector, GST_TYPE_ELEMENT,
_do_init);
static void
gst_input_selector_class_init (GstInputSelectorClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (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_PARAM_STATIC_STRINGS));
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_PARAM_STATIC_STRINGS));
/**
* GstInputSelector:sync-streams
*
* If set to %TRUE all inactive streams will be synced to the
* running time of the active stream. This makes sure that no
* buffers are dropped by input-selector that might be needed
* when switching the active pad.
*
* Since: 0.10.35
*/
g_object_class_install_property (gobject_class, PROP_SYNC_STREAMS,
g_param_spec_boolean ("sync-streams", "Sync Streams",
"Synchronize inactive streams to the running time of the active stream",
DEFAULT_SYNC_STREAMS, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* 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_input_selector_marshal_INT64__VOID, G_TYPE_INT64, 0);
gst_element_class_set_details_simple (gstelement_class, "Input selector",
"Generic", "N-to-1 input stream selector",
"Julien Moutte <julien@moutte.net>, "
"Jan Schmidt <thaytan@mad.scientist.com>, "
"Wim Taymans <wim.taymans@gmail.com>");
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_input_selector_sink_factory));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_input_selector_src_factory));
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);
}
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;
sel->sync_streams = DEFAULT_SYNC_STREAMS;
sel->lock = g_mutex_new ();
sel->cond = g_cond_new ();
sel->blocked = 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);
}
/* 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)
{
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 (old)
old->pushed = FALSE;
if (new)
new->pushed = FALSE;
/* Send a new SEGMENT event on the new pad next */
if (old != new && new)
new->segment_pending = TRUE;
active_pad_p = &self->active_sinkpad;
gst_object_replace ((GstObject **) active_pad_p, GST_OBJECT_CAST (pad));
/* Wake up all non-active pads in sync mode, they might be
* the active pad now */
if (self->sync_streams)
GST_INPUT_SELECTOR_BROADCAST (self);
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_INPUT_SELECTOR_UNLOCK (sel);
break;
}
case PROP_SYNC_STREAMS:
{
GST_INPUT_SELECTOR_LOCK (sel);
sel->sync_streams = g_value_get_boolean (value);
GST_INPUT_SELECTOR_UNLOCK (sel);
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_SYNC_STREAMS:
GST_INPUT_SELECTOR_LOCK (object);
g_value_set_boolean (value, sel->sync_streams);
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 (GstInputSelector * sel, GstPad * pad,
gboolean strict)
{
GstPad *otherpad = NULL;
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);
return otherpad;
}
static gboolean
gst_input_selector_event (GstPad * pad, GstEvent * event)
{
GstInputSelector *sel;
gboolean result = FALSE;
GstIterator *iter;
gboolean done = FALSE;
GValue item = { 0, };
GstPad *eventpad;
GList *pushed_pads = NULL;
sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
if (G_UNLIKELY (sel == NULL)) {
gst_event_unref (event);
return FALSE;
}
/* Send upstream events to all sinkpads */
iter = gst_element_iterate_sink_pads (GST_ELEMENT_CAST (sel));
/* This is now essentially a copy of gst_pad_event_default_dispatch
* with a different iterator */
while (!done) {
switch (gst_iterator_next (iter, &item)) {
case GST_ITERATOR_OK:
eventpad = g_value_get_object (&item);
/* if already pushed, skip */
if (g_list_find (pushed_pads, eventpad)) {
g_value_reset (&item);
break;
}
gst_event_ref (event);
result |= gst_pad_push_event (eventpad, event);
g_value_reset (&item);
break;
case GST_ITERATOR_RESYNC:
/* We don't reset the result here because we don't push the event
* again on pads that got the event already and because we need
* to consider the result of the previous pushes */
gst_iterator_resync (iter);
break;
case GST_ITERATOR_ERROR:
GST_ERROR_OBJECT (pad, "Could not iterate over sinkpads");
done = TRUE;
break;
case GST_ITERATOR_DONE:
done = TRUE;
break;
}
}
g_value_unset (&item);
gst_iterator_free (iter);
g_list_free (pushed_pads);
gst_event_unref (event);
return result;
}
/* 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));
if (G_UNLIKELY (sel == NULL))
return FALSE;
otherpad = gst_input_selector_get_linked_pad (sel, 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, GstCaps * filter)
{
GstPad *otherpad;
GstInputSelector *sel;
GstCaps *caps;
sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
if (G_UNLIKELY (sel == NULL))
return (filter ? gst_caps_ref (filter) : gst_caps_new_any ());
otherpad = gst_input_selector_get_linked_pad (sel, pad, FALSE);
if (!otherpad) {
GST_DEBUG_OBJECT (pad, "Pad not linked, returning ANY");
caps = (filter ? gst_caps_ref (filter) : gst_caps_new_any ());
} else {
GST_DEBUG_OBJECT (pad, "Pad is linked (to %s:%s), returning peer caps",
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, filter)))
caps = (filter ? gst_caps_ref (filter) : gst_caps_new_any ());
gst_object_unref (otherpad);
}
gst_object_unref (sel);
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) {
/* first pad we get activity on becomes the activated pad by default */
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, const GstCaps * caps)
{
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_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 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;
}
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