mirrors/gstreamer
mirrors/gstreamer
1
1
Fork 0
mirror of https://gitlab.freedesktop.org/gstreamer/gstreamer.git synced 2024-11-16 06:21:36 +00:00
Code Issues 1 Projects Releases Wiki Activity
gstreamer/plugins/elements/gstinputselector.c
Thibault Saunier 24d789a9b5 input-selector: Ensure events are forwarded only once per pad 
The code was prepared to do it but was missing to fill the pushed_pads
list.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/485>
2020-05-15 13:51:43 +00:00

1908 lines
58 KiB
C
Raw Blame History

/* 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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:element-input-selector
* @title: 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:
*
* * "running-time": Running time of stream on pad (#gint64)
* * "tags": The currently active tags on the pad (#GstTagList, boxed type)
* * "active": If the pad is currently active (#gboolean)
* * "always-ok" : Make an inactive pads return #GST_FLOW_OK instead of
* #GST_FLOW_NOT_LINKED
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include "gstinputselector.h"
#define DEBUG_CACHED_BUFFERS 0
GST_DEBUG_CATEGORY_STATIC (input_selector_debug);
#define GST_CAT_DEFAULT input_selector_debug
#define GST_TYPE_INPUT_SELECTOR_SYNC_MODE (gst_input_selector_sync_mode_get_type())
static GType
gst_input_selector_sync_mode_get_type (void)
{
static GType type = 0;
static const GEnumValue data[] = {
{GST_INPUT_SELECTOR_SYNC_MODE_ACTIVE_SEGMENT,
"Sync using the current active segment",
"active-segment"},
{GST_INPUT_SELECTOR_SYNC_MODE_CLOCK, "Sync using the clock", "clock"},
{0, NULL, NULL},
};
if (!type) {
type = g_enum_register_static ("GstInputSelectorSyncMode", data);
}
return type;
}
#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_%u",
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,
PROP_SYNC_MODE,
PROP_CACHE_BUFFERS
};
#define DEFAULT_SYNC_STREAMS TRUE
#define DEFAULT_SYNC_MODE GST_INPUT_SELECTOR_SYNC_MODE_ACTIVE_SEGMENT
#define DEFAULT_CACHE_BUFFERS 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
};
static void gst_input_selector_active_pad_changed (GstInputSelector * sel,
GParamSpec * pspec, gpointer user_data);
static inline gboolean gst_input_selector_is_active_sinkpad (GstInputSelector *
sel, GstPad * pad);
static GstPad *gst_input_selector_get_active_sinkpad (GstInputSelector * sel);
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;
typedef struct _GstSelectorPadCachedBuffer GstSelectorPadCachedBuffer;
struct _GstSelectorPad
{
GstPad parent;
gboolean pushed; /* when buffer was pushed downstream since activation */
guint group_id; /* Group ID from the last stream-start */
gboolean group_done; /* when Stream Group Done has been
received */
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 */
GstSegment segment; /* the current segment on the pad */
guint32 segment_seqnum; /* sequence number of the current segment */
gboolean events_pending; /* TRUE if sticky events need to be updated */
gboolean sending_cached_buffers;
GQueue *cached_buffers;
};
struct _GstSelectorPadCachedBuffer
{
GstBuffer *buffer;
GstSegment segment;
};
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, GstObject * parent,
GstEvent * event);
static gboolean gst_selector_pad_query (GstPad * pad, GstObject * parent,
GstQuery * query);
static GstIterator *gst_selector_pad_iterate_linked_pads (GstPad * pad,
GstObject * parent);
static GstFlowReturn gst_selector_pad_chain (GstPad * pad, GstObject * parent,
GstBuffer * buf);
static void gst_selector_pad_cache_buffer (GstSelectorPad * selpad,
GstBuffer * buffer);
static void gst_selector_pad_free_cached_buffers (GstSelectorPad * selpad);
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_unref (pad->tags);
gst_selector_pad_free_cached_buffers (pad);
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));
if (sel) {
g_value_set_boolean (value, gst_input_selector_is_active_sinkpad (sel,
GST_PAD_CAST (spad)));
gst_object_unref (sel);
} else {
g_value_set_boolean (value, FALSE);
}
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->segment.format == GST_FORMAT_TIME) {
ret =
gst_segment_to_running_time (&pad->segment, pad->segment.format,
pad->segment.position);
}
GST_OBJECT_UNLOCK (pad);
GST_DEBUG_OBJECT (pad, "running time: %" GST_TIME_FORMAT
" segment: %" GST_SEGMENT_FORMAT, GST_TIME_ARGS (ret), &pad->segment);
return ret;
}
/* must be called with the SELECTOR_LOCK */
static void
gst_selector_pad_reset (GstSelectorPad * pad)
{
GST_OBJECT_LOCK (pad);
pad->pushed = FALSE;
pad->group_done = FALSE;
pad->eos = FALSE;
pad->eos_sent = FALSE;
pad->events_pending = FALSE;
pad->discont = FALSE;
pad->flushing = FALSE;
gst_segment_init (&pad->segment, GST_FORMAT_UNDEFINED);
pad->sending_cached_buffers = FALSE;
gst_selector_pad_free_cached_buffers (pad);
GST_OBJECT_UNLOCK (pad);
}
static GstSelectorPadCachedBuffer *
gst_selector_pad_new_cached_buffer (GstSelectorPad * selpad, GstBuffer * buffer)
{
GstSelectorPadCachedBuffer *cached_buffer =
g_slice_new (GstSelectorPadCachedBuffer);
cached_buffer->buffer = buffer;
cached_buffer->segment = selpad->segment;
return cached_buffer;
}
static void
gst_selector_pad_free_cached_buffer (GstSelectorPadCachedBuffer * cached_buffer)
{
if (cached_buffer->buffer)
gst_buffer_unref (cached_buffer->buffer);
g_slice_free (GstSelectorPadCachedBuffer, cached_buffer);
}
/* must be called with the SELECTOR_LOCK */
static void
gst_selector_pad_cache_buffer (GstSelectorPad * selpad, GstBuffer * buffer)
{
if (selpad->segment.format != GST_FORMAT_TIME) {
GST_DEBUG_OBJECT (selpad, "Buffer %p with segment not in time format, "
"not caching", buffer);
gst_buffer_unref (buffer);
return;
}
GST_DEBUG_OBJECT (selpad, "Caching buffer %p", buffer);
if (!selpad->cached_buffers)
selpad->cached_buffers = g_queue_new ();
g_queue_push_tail (selpad->cached_buffers,
gst_selector_pad_new_cached_buffer (selpad, buffer));
}
/* must be called with the SELECTOR_LOCK */
static void
gst_selector_pad_free_cached_buffers (GstSelectorPad * selpad)
{
if (!selpad->cached_buffers)
return;
GST_DEBUG_OBJECT (selpad, "Freeing cached buffers");
g_queue_free_full (selpad->cached_buffers,
(GDestroyNotify) gst_selector_pad_free_cached_buffer);
selpad->cached_buffers = NULL;
}
/* 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, GstObject * parent)
{
GstInputSelector *sel;
GstPad *otherpad;
GstIterator *it = NULL;
GValue val = { 0, };
sel = GST_INPUT_SELECTOR (parent);
otherpad = gst_input_selector_get_linked_pad (sel, pad, TRUE);
if (otherpad) {
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);
gst_object_unref (otherpad);
}
return it;
}
static gboolean
forward_sticky_events (GstPad * sinkpad, GstEvent ** event, gpointer user_data)
{
GstInputSelector *sel = GST_INPUT_SELECTOR (user_data);
GST_DEBUG_OBJECT (sinkpad, "forward sticky event %" GST_PTR_FORMAT, *event);
if (GST_EVENT_TYPE (*event) == GST_EVENT_SEGMENT) {
GstSegment *seg = &GST_SELECTOR_PAD (sinkpad)->segment;
GstEvent *e;
e = gst_event_new_segment (seg);
gst_event_set_seqnum (e, GST_SELECTOR_PAD_CAST (sinkpad)->segment_seqnum);
gst_pad_push_event (sel->srcpad, e);
} else if (GST_EVENT_TYPE (*event) == GST_EVENT_STREAM_START
&& !sel->have_group_id) {
GstEvent *tmp =
gst_pad_get_sticky_event (sel->srcpad, GST_EVENT_STREAM_START, 0);
/* Only push stream-start once if not all our streams have a stream-id */
if (!tmp) {
gst_pad_push_event (sel->srcpad, gst_event_ref (*event));
} else {
gst_event_unref (tmp);
}
} else {
gst_pad_push_event (sel->srcpad, gst_event_ref (*event));
}
return TRUE;
}
static gboolean
gst_input_selector_eos_wait (GstInputSelector * self, GstSelectorPad * pad,
GstEvent * eos_event)
{
while (!self->eos && !self->flushing && !pad->flushing) {
GstPad *active_sinkpad;
active_sinkpad = gst_input_selector_get_active_sinkpad (self);
if (pad == GST_SELECTOR_PAD_CAST (active_sinkpad) && pad->eos
&& !pad->eos_sent) {
GST_DEBUG_OBJECT (pad, "send EOS event");
GST_INPUT_SELECTOR_UNLOCK (self);
/* if we have a pending events, push them now */
if (pad->events_pending) {
gst_pad_sticky_events_foreach (GST_PAD_CAST (pad),
forward_sticky_events, self);
pad->events_pending = FALSE;
}
gst_pad_push_event (self->srcpad, gst_event_ref (eos_event));
GST_INPUT_SELECTOR_LOCK (self);
/* Wake up other pads so they can continue when syncing to
* running time, as this pad just switched to EOS and
* may enable others to progress */
GST_INPUT_SELECTOR_BROADCAST (self);
pad->eos_sent = TRUE;
} else {
/* 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 gboolean
gst_input_selector_all_eos (GstInputSelector * sel)
{
GList *walk;
for (walk = GST_ELEMENT_CAST (sel)->sinkpads; walk; walk = walk->next) {
GstSelectorPad *selpad;
selpad = GST_SELECTOR_PAD_CAST (walk->data);
if (!selpad->eos) {
return FALSE;
}
}
return TRUE;
}
static gboolean
gst_selector_pad_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
gboolean res = TRUE;
gboolean forward;
gboolean new_tags = FALSE;
GstInputSelector *sel;
GstSelectorPad *selpad;
GstPad *prev_active_sinkpad;
GstPad *active_sinkpad;
sel = GST_INPUT_SELECTOR (parent);
selpad = GST_SELECTOR_PAD_CAST (pad);
GST_DEBUG_OBJECT (selpad, "received event %" GST_PTR_FORMAT, event);
GST_INPUT_SELECTOR_LOCK (sel);
prev_active_sinkpad =
sel->active_sinkpad ? gst_object_ref (sel->active_sinkpad) : NULL;
active_sinkpad = gst_input_selector_get_active_sinkpad (sel);
gst_object_ref (active_sinkpad);
GST_INPUT_SELECTOR_UNLOCK (sel);
if (prev_active_sinkpad != active_sinkpad) {
if (prev_active_sinkpad)
g_object_notify (G_OBJECT (prev_active_sinkpad), "active");
g_object_notify (G_OBJECT (active_sinkpad), "active");
g_object_notify (G_OBJECT (sel), "active-pad");
}
if (prev_active_sinkpad)
gst_object_unref (prev_active_sinkpad);
gst_object_unref (active_sinkpad);
GST_INPUT_SELECTOR_LOCK (sel);
active_sinkpad = gst_input_selector_get_active_sinkpad (sel);
/* only forward if we are dealing with the active sinkpad */
forward = (pad == active_sinkpad);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_STREAM_START:{
if (!gst_event_parse_group_id (event, &selpad->group_id)) {
sel->have_group_id = FALSE;
selpad->group_id = 0;
}
break;
}
case GST_EVENT_FLUSH_START:
/* Unblock the pad if it's waiting */
selpad->flushing = TRUE;
sel->eos = FALSE;
selpad->group_done = FALSE;
GST_INPUT_SELECTOR_BROADCAST (sel);
break;
case GST_EVENT_FLUSH_STOP:
gst_selector_pad_reset (selpad);
break;
case GST_EVENT_SEGMENT:
{
gst_event_copy_segment (event, &selpad->segment);
selpad->segment_seqnum = gst_event_get_seqnum (event);
GST_DEBUG_OBJECT (pad, "configured SEGMENT %" GST_SEGMENT_FORMAT,
&selpad->segment);
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;
GST_OBJECT_UNLOCK (selpad);
if (oldtags)
gst_tag_list_unref (oldtags);
GST_DEBUG_OBJECT (pad, "received tags %" GST_PTR_FORMAT, newtags);
new_tags = TRUE;
break;
}
case GST_EVENT_EOS:
selpad->eos = TRUE;
GST_DEBUG_OBJECT (pad, "received EOS");
if (gst_input_selector_all_eos (sel)) {
GST_DEBUG_OBJECT (pad, "All sink pad received EOS");
sel->eos = TRUE;
GST_INPUT_SELECTOR_BROADCAST (sel);
} else {
gst_input_selector_eos_wait (sel, selpad, event);
forward = FALSE;
}
break;
case GST_EVENT_GAP:{
GstClockTime ts, dur;
GST_DEBUG_OBJECT (pad, "Received gap event: %" GST_PTR_FORMAT, event);
gst_event_parse_gap (event, &ts, &dur);
if (GST_CLOCK_TIME_IS_VALID (ts)) {
if (GST_CLOCK_TIME_IS_VALID (dur))
ts += dur;
/* update the segment position */
GST_OBJECT_LOCK (pad);
selpad->segment.position = ts;
GST_OBJECT_UNLOCK (pad);
if (sel->sync_streams && active_sinkpad == pad)
GST_INPUT_SELECTOR_BROADCAST (sel);
}
}
break;
case GST_EVENT_STREAM_GROUP_DONE:{
GST_DEBUG_OBJECT (sel, "Stream group-done in inputselector pad %s",
GST_OBJECT_NAME (selpad));
gst_event_parse_stream_group_done (event, &selpad->group_id);
selpad->group_done = TRUE;
if (sel->sync_streams && active_sinkpad == pad)
GST_INPUT_SELECTOR_BROADCAST (sel);
break;
}
default:
break;
}
GST_INPUT_SELECTOR_UNLOCK (sel);
if (new_tags)
g_object_notify (G_OBJECT (selpad), "tags");
if (forward) {
GST_DEBUG_OBJECT (pad, "forwarding event");
res = gst_pad_push_event (sel->srcpad, event);
} else {
/* 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 (GST_EVENT_IS_STICKY (event))
selpad->events_pending = TRUE;
gst_event_unref (event);
}
return res;
}
static gboolean
gst_selector_pad_query (GstPad * pad, GstObject * parent, GstQuery * query)
{
gboolean res = FALSE;
GstInputSelector *self = (GstInputSelector *) parent;
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_CAPS:
case GST_QUERY_POSITION:
case GST_QUERY_DURATION:
case GST_QUERY_CONTEXT:
/* always proxy caps/position/duration/context queries, regardless of active pad or not
* See https://bugzilla.gnome.org/show_bug.cgi?id=775445 */
res = gst_pad_peer_query (self->srcpad, query);
break;
case GST_QUERY_ALLOCATION:{
GstPad *active_sinkpad;
GstInputSelector *sel = GST_INPUT_SELECTOR (parent);
/* Only do the allocation query for the active sinkpad,
* after switching a reconfigure event is sent and upstream
* should reconfigure and do a new allocation query
*/
if (GST_PAD_DIRECTION (pad) == GST_PAD_SINK) {
GST_INPUT_SELECTOR_LOCK (sel);
active_sinkpad = gst_input_selector_get_active_sinkpad (sel);
GST_INPUT_SELECTOR_UNLOCK (sel);
if (pad != active_sinkpad) {
res = FALSE;
goto done;
}
}
}
/* fall through */
default:
res = gst_pad_query_default (pad, parent, query);
break;
}
done:
return res;
}
static GstClockTime
gst_input_selector_get_clipped_running_time (GstSegment * seg, GstBuffer * buf)
{
GstClockTime running_time;
running_time = GST_BUFFER_PTS (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);
/* Only use the segment to convert to running time if the segment is
* in TIME format, otherwise do our best to try to sync */
if (GST_CLOCK_TIME_IS_VALID (seg->stop)) {
if (running_time > seg->stop) {
running_time = seg->stop;
}
}
return gst_segment_to_running_time (seg, GST_FORMAT_TIME, running_time);
}
/* must be called without the SELECTOR_LOCK, will wait 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 * selpad, GstBuffer * buf)
{
GstSegment *seg;
GST_DEBUG_OBJECT (selpad, "entering wait for buffer %p", buf);
/* If we have no valid timestamp we can't sync this buffer */
if (!GST_BUFFER_PTS_IS_VALID (buf)) {
GST_DEBUG_OBJECT (selpad, "leaving wait for buffer with "
"invalid timestamp");
return FALSE;
}
seg = &selpad->segment;
/* Wait until
* a) this is the active pad
* b) the pad or the selector is flushing
* c) the buffer running time is before the current running time
* (either active-seg or clock, depending on sync-mode)
*/
GST_INPUT_SELECTOR_LOCK (sel);
while (TRUE) {
GstPad *active_sinkpad;
GstSelectorPad *active_selpad;
GstClock *clock;
gint64 cur_running_time;
GstClockTime running_time;
active_sinkpad = gst_input_selector_get_active_sinkpad (sel);
active_selpad = GST_SELECTOR_PAD_CAST (active_sinkpad);
if (seg->format != GST_FORMAT_TIME) {
GST_DEBUG_OBJECT (selpad,
"Not waiting because we don't have a TIME segment");
GST_INPUT_SELECTOR_UNLOCK (sel);
return FALSE;
}
running_time = gst_input_selector_get_clipped_running_time (seg, buf);
/* If this is outside the segment don't sync */
if (running_time == -1) {
GST_DEBUG_OBJECT (selpad,
"Not waiting because buffer is outside segment");
GST_INPUT_SELECTOR_UNLOCK (sel);
return FALSE;
}
cur_running_time = GST_CLOCK_TIME_NONE;
if (sel->sync_mode == GST_INPUT_SELECTOR_SYNC_MODE_CLOCK) {
clock = gst_element_get_clock (GST_ELEMENT_CAST (sel));
if (clock) {
GstClockTime base_time;
cur_running_time = gst_clock_get_time (clock);
base_time = gst_element_get_base_time (GST_ELEMENT_CAST (sel));
if (base_time <= cur_running_time)
cur_running_time -= base_time;
else
cur_running_time = 0;
gst_object_unref (clock);
}
} else {
GstSegment *active_seg;
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)) {
GST_DEBUG_OBJECT (selpad,
"Not waiting because active segment isn't in TIME format");
GST_INPUT_SELECTOR_UNLOCK (sel);
return FALSE;
}
/* Get active pad's running time, if no configured segment yet keep at -1 */
if (active_seg->format == GST_FORMAT_TIME)
cur_running_time = gst_segment_to_running_time (active_seg,
GST_FORMAT_TIME, active_seg->position);
}
/* Don't wait if the group is finished on the active pad,
* as the running time won't progress now */
if (selpad != active_selpad && active_selpad->group_done &&
selpad->group_id == active_selpad->group_id) {
GST_DEBUG_OBJECT (selpad, "Active pad received group-done. Unblocking");
GST_INPUT_SELECTOR_UNLOCK (sel);
break;
}
if (selpad != active_selpad && !sel->eos && !sel->flushing
&& !selpad->flushing && (cur_running_time == GST_CLOCK_TIME_NONE
|| running_time >= cur_running_time)) {
GST_DEBUG_OBJECT (selpad,
"Waiting for active streams to advance. %" GST_TIME_FORMAT " >= %"
GST_TIME_FORMAT, GST_TIME_ARGS (running_time),
GST_TIME_ARGS (cur_running_time));
GST_INPUT_SELECTOR_WAIT (sel);
} else {
GST_INPUT_SELECTOR_UNLOCK (sel);
break;
}
}
/* Return TRUE if the selector or the pad is flushing */
return (sel->flushing || selpad->flushing);
}
#if DEBUG_CACHED_BUFFERS
static void
gst_input_selector_debug_cached_buffers (GstInputSelector * sel)
{
GList *walk;
if (gst_debug_category_get_threshold (input_selector_debug) < GST_LEVEL_DEBUG)
return;
for (walk = GST_ELEMENT_CAST (sel)->sinkpads; walk; walk = walk->next) {
GstSelectorPad *selpad;
GString *timestamps;
GList *l;
selpad = GST_SELECTOR_PAD_CAST (walk->data);
if (!selpad->cached_buffers) {
GST_DEBUG_OBJECT (selpad, "Cached buffers timestamps: <none>");
continue;
}
timestamps = g_string_new ("Cached buffers timestamps:");
for (l = selpad->cached_buffers->head; l != NULL; l = l->next) {
GstSelectorPadCachedBuffer *cached_buffer = l->data;
g_string_append_printf (timestamps, " %" GST_TIME_FORMAT,
GST_TIME_ARGS (GST_BUFFER_PTS (cached_buffer->buffer)));
}
GST_DEBUG_OBJECT (selpad, "%s", timestamps->str);
g_string_free (timestamps, TRUE);
}
}
#endif
/* must be called with the SELECTOR_LOCK */
static void
gst_input_selector_cleanup_old_cached_buffers (GstInputSelector * sel,
GstPad * pad)
{
GstClock *clock;
gint64 cur_running_time;
GList *walk;
cur_running_time = GST_CLOCK_TIME_NONE;
if (sel->sync_mode == GST_INPUT_SELECTOR_SYNC_MODE_CLOCK) {
clock = gst_element_get_clock (GST_ELEMENT_CAST (sel));
if (clock) {
GstClockTime base_time;
cur_running_time = gst_clock_get_time (clock);
base_time = gst_element_get_base_time (GST_ELEMENT_CAST (sel));
if (base_time <= cur_running_time)
cur_running_time -= base_time;
else
cur_running_time = 0;
gst_object_unref (clock);
}
} else {
GstPad *active_sinkpad;
GstSelectorPad *active_selpad;
GstSegment *active_seg;
active_sinkpad = gst_input_selector_get_active_sinkpad (sel);
active_selpad = GST_SELECTOR_PAD_CAST (active_sinkpad);
active_seg = &active_selpad->segment;
/* Get active pad's running time, if no configured segment yet keep at -1 */
if (active_seg->format == GST_FORMAT_TIME)
cur_running_time = gst_segment_to_running_time (active_seg,
GST_FORMAT_TIME, active_seg->position);
}
if (!GST_CLOCK_TIME_IS_VALID (cur_running_time))
return;
GST_DEBUG_OBJECT (sel, "Cleaning up old cached buffers");
for (walk = GST_ELEMENT_CAST (sel)->sinkpads; walk; walk = g_list_next (walk)) {
GstSelectorPad *selpad;
GstSegment *seg;
GstSelectorPadCachedBuffer *cached_buffer;
GSList *maybe_remove;
guint queue_position;
selpad = GST_SELECTOR_PAD_CAST (walk->data);
if (!selpad->cached_buffers)
continue;
seg = &selpad->segment;
maybe_remove = NULL;
queue_position = 0;
while ((cached_buffer = g_queue_peek_nth (selpad->cached_buffers,
queue_position))) {
GstBuffer *buffer = cached_buffer->buffer;
GstClockTime running_time;
GSList *l;
/* If we have no valid timestamp we can't sync this buffer */
if (!GST_BUFFER_PTS_IS_VALID (buffer)) {
maybe_remove = g_slist_append (maybe_remove, cached_buffer);
queue_position = g_slist_length (maybe_remove);
continue;
}
/* the buffer is still valid if its duration is valid and the
* timestamp + duration is >= time, or if its duration is invalid
* and the timestamp is >= time */
running_time = gst_input_selector_get_clipped_running_time (seg, buffer);
GST_DEBUG_OBJECT (selpad,
"checking if buffer %p running time=%" GST_TIME_FORMAT
" >= stream time=%" GST_TIME_FORMAT, buffer,
GST_TIME_ARGS (running_time), GST_TIME_ARGS (cur_running_time));
if (running_time >= cur_running_time) {
break;
}
GST_DEBUG_OBJECT (selpad, "Removing old cached buffer %p", buffer);
g_queue_pop_nth (selpad->cached_buffers, queue_position);
gst_selector_pad_free_cached_buffer (cached_buffer);
for (l = maybe_remove; l != NULL; l = g_slist_next (l)) {
/* A buffer after some invalid buffers was removed, it means the invalid buffers
* are old, lets also remove them */
cached_buffer = l->data;
g_queue_remove (selpad->cached_buffers, cached_buffer);
gst_selector_pad_free_cached_buffer (cached_buffer);
}
g_slist_free (maybe_remove);
maybe_remove = NULL;
queue_position = 0;
}
g_slist_free (maybe_remove);
maybe_remove = NULL;
if (g_queue_is_empty (selpad->cached_buffers)) {
g_queue_free (selpad->cached_buffers);
selpad->cached_buffers = NULL;
}
}
#if DEBUG_CACHED_BUFFERS
gst_input_selector_debug_cached_buffers (sel);
#endif
}
static GstFlowReturn
gst_selector_pad_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
{
GstInputSelector *sel;
GstFlowReturn res;
GstPad *active_sinkpad;
GstPad *prev_active_sinkpad = NULL;
GstSelectorPad *selpad;
sel = GST_INPUT_SELECTOR (parent);
selpad = GST_SELECTOR_PAD_CAST (pad);
GST_DEBUG_OBJECT (selpad,
"entering chain for buf %p with timestamp %" GST_TIME_FORMAT, buf,
GST_TIME_ARGS (GST_BUFFER_PTS (buf)));
GST_INPUT_SELECTOR_LOCK (sel);
if (sel->flushing) {
GST_INPUT_SELECTOR_UNLOCK (sel);
goto flushing;
}
GST_LOG_OBJECT (pad, "getting active pad");
prev_active_sinkpad =
sel->active_sinkpad ? gst_object_ref (sel->active_sinkpad) : NULL;
active_sinkpad = gst_input_selector_get_active_sinkpad (sel);
/* In sync mode wait until the active pad has advanced
* after the running time of the current buffer */
if (sel->sync_streams) {
/* call chain for each cached buffer if we are not the active pad
* or if we are the active pad but didn't push anything yet. */
if (active_sinkpad != pad || !selpad->pushed) {
/* no need to check for sel->cache_buffers as selpad->cached_buffers
* will only be valid if cache_buffers is TRUE */
if (selpad->cached_buffers && !selpad->sending_cached_buffers) {
GstSelectorPadCachedBuffer *cached_buffer;
GstSegment saved_segment;
saved_segment = selpad->segment;
selpad->sending_cached_buffers = TRUE;
while (!sel->eos && !sel->flushing && !selpad->flushing &&
(cached_buffer = g_queue_pop_head (selpad->cached_buffers))) {
GST_DEBUG_OBJECT (pad, "Cached buffers found, "
"invoking chain for cached buffer %p", cached_buffer->buffer);
selpad->segment = cached_buffer->segment;
selpad->events_pending = TRUE;
GST_INPUT_SELECTOR_UNLOCK (sel);
gst_selector_pad_chain (pad, parent, cached_buffer->buffer);
GST_INPUT_SELECTOR_LOCK (sel);
/* We just passed the ownership of the buffer to the chain function */
cached_buffer->buffer = NULL;
gst_selector_pad_free_cached_buffer (cached_buffer);
/* we may have cleaned up the queue in the meantime because of
* old buffers */
if (!selpad->cached_buffers) {
break;
}
}
selpad->sending_cached_buffers = FALSE;
/* all cached buffers sent, restore segment for current buffer */
selpad->segment = saved_segment;
selpad->events_pending = TRUE;
/* Might have changed while calling chain for cached buffers */
active_sinkpad = gst_input_selector_get_active_sinkpad (sel);
}
}
if (active_sinkpad != pad) {
GST_INPUT_SELECTOR_UNLOCK (sel);
if (gst_input_selector_wait_running_time (sel, selpad, buf))
goto flushing;
GST_INPUT_SELECTOR_LOCK (sel);
}
/* Might have changed while waiting */
active_sinkpad = gst_input_selector_get_active_sinkpad (sel);
}
/* update the segment on the srcpad */
if (GST_BUFFER_PTS_IS_VALID (buf)) {
GstClockTime start_time = GST_BUFFER_PTS (buf);
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->segment.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);
GST_INPUT_SELECTOR_UNLOCK (sel);
if (prev_active_sinkpad != active_sinkpad) {
if (prev_active_sinkpad)
g_object_notify (G_OBJECT (prev_active_sinkpad), "active");
g_object_notify (G_OBJECT (active_sinkpad), "active");
g_object_notify (G_OBJECT (sel), "active-pad");
}
/* if we have a pending events, push them now */
if (G_UNLIKELY (prev_active_sinkpad != active_sinkpad
|| selpad->events_pending)) {
gst_pad_sticky_events_foreach (GST_PAD_CAST (selpad), forward_sticky_events,
sel);
selpad->events_pending = FALSE;
}
if (prev_active_sinkpad) {
gst_object_unref (prev_active_sinkpad);
prev_active_sinkpad = NULL;
}
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 with timestamp %" GST_TIME_FORMAT,
buf, GST_TIME_ARGS (GST_BUFFER_PTS (buf)));
/* Only make the buffer read-only when necessary */
if (sel->sync_streams && sel->cache_buffers)
buf = gst_buffer_ref (buf);
res = gst_pad_push (sel->srcpad, buf);
GST_LOG_OBJECT (pad, "Buffer %p forwarded result=%d", buf, res);
GST_INPUT_SELECTOR_LOCK (sel);
if (sel->sync_streams && sel->cache_buffers) {
/* Might have changed while pushing */
active_sinkpad = gst_input_selector_get_active_sinkpad (sel);
/* only set pad to pushed if we are still the active pad */
if (active_sinkpad == pad)
selpad->pushed = TRUE;
/* cache buffer as we may need it again if we change pads */
gst_selector_pad_cache_buffer (selpad, buf);
gst_input_selector_cleanup_old_cached_buffers (sel, pad);
} else {
selpad->pushed = TRUE;
}
GST_INPUT_SELECTOR_UNLOCK (sel);
done:
if (prev_active_sinkpad)
gst_object_unref (prev_active_sinkpad);
prev_active_sinkpad = NULL;
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_buffer_unref (buf);
res = GST_FLOW_FLUSHING;
goto done;
}
}
static void gst_input_selector_dispose (GObject * object);
static void gst_input_selector_finalize (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 gboolean gst_input_selector_event (GstPad * pad, GstObject * parent,
GstEvent * event);
static gboolean gst_input_selector_query (GstPad * pad, GstObject * parent,
GstQuery * query);
#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->finalize = gst_input_selector_finalize;
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 | GST_PARAM_MUTABLE_PLAYING |
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 or to the current clock.
*
* To make sure no buffers are dropped by input-selector
* that might be needed when switching the active pad,
* sync-mode should be set to "clock" and cache-buffers to TRUE.
*/
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 or to the current clock",
DEFAULT_SYNC_STREAMS,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
GST_PARAM_MUTABLE_READY));
/**
* GstInputSelector:sync-mode
*
* Select how input-selector will sync buffers when in sync-streams mode.
*
* Note that when using the "active-segment" mode, the "active-segment" may
* be ahead of current clock time when switching the active pad, as the current
* active pad may have pushed more buffers than what was displayed/consumed,
* which may cause delays and some missing buffers.
*/
g_object_class_install_property (gobject_class, PROP_SYNC_MODE,
g_param_spec_enum ("sync-mode", "Sync mode",
"Behavior in sync-streams mode", GST_TYPE_INPUT_SELECTOR_SYNC_MODE,
DEFAULT_SYNC_MODE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
GST_PARAM_MUTABLE_READY));
/**
* GstInputSelector:cache-buffers
*
* If set to %TRUE and GstInputSelector:sync-streams is also set to %TRUE,
* the active pad will cache the buffers still considered valid (after current
* running time, see sync-mode) to avoid missing frames if/when the pad is
* reactivated.
*
* The active pad may push more buffers than what is currently displayed/consumed
* and when changing pads those buffers will be discarded and the only way to
* reactivate that pad without losing the already consumed buffers is to enable cache.
*/
g_object_class_install_property (gobject_class, PROP_CACHE_BUFFERS,
g_param_spec_boolean ("cache-buffers", "Cache Buffers",
"Cache buffers for active-pad",
DEFAULT_CACHE_BUFFERS,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
GST_PARAM_MUTABLE_READY));
gst_element_class_set_static_metadata (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_static_pad_template_with_gtype (gstelement_class,
&gst_input_selector_sink_factory, GST_TYPE_SELECTOR_PAD);
gst_element_class_add_static_pad_template (gstelement_class,
&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;
}
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_event_function (sel->srcpad,
GST_DEBUG_FUNCPTR (gst_input_selector_event));
gst_pad_set_query_function (sel->srcpad,
GST_DEBUG_FUNCPTR (gst_input_selector_query));
GST_OBJECT_FLAG_SET (sel->srcpad, GST_PAD_FLAG_PROXY_CAPS);
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->sync_mode = DEFAULT_SYNC_MODE;
sel->have_group_id = TRUE;
g_mutex_init (&sel->lock);
g_cond_init (&sel->cond);
sel->eos = FALSE;
/* lets give a change for downstream to do something on
* active-pad change before we start pushing new buffers */
g_signal_connect_data (sel, "notify::active-pad",
(GCallback) gst_input_selector_active_pad_changed, NULL,
NULL, G_CONNECT_AFTER);
}
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;
}
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
gst_input_selector_finalize (GObject * object)
{
GstInputSelector *sel = GST_INPUT_SELECTOR (object);
g_mutex_clear (&sel->lock);
g_cond_clear (&sel->cond);
G_OBJECT_CLASS (parent_class)->finalize (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;
/* guard against users setting a src pad or foreign pad as active pad */
if (pad != NULL) {
g_return_val_if_fail (GST_PAD_IS_SINK (pad), FALSE);
g_return_val_if_fail (GST_IS_SELECTOR_PAD (pad), FALSE);
g_return_val_if_fail (GST_PAD_PARENT (pad) == GST_ELEMENT_CAST (self),
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->events_pending = TRUE;
active_pad_p = &self->active_sinkpad;
gst_object_replace ((GstObject **) active_pad_p, GST_OBJECT_CAST (pad));
if (old && old != new)
gst_pad_push_event (GST_PAD_CAST (old), gst_event_new_reconfigure ());
if (new)
gst_pad_push_event (GST_PAD_CAST (new), gst_event_new_reconfigure ());
GST_DEBUG_OBJECT (self, "New active pad is %" GST_PTR_FORMAT,
self->active_sinkpad);
if (old != new && new && new->eos) {
new->eos_sent = FALSE;
GST_INPUT_SELECTOR_BROADCAST (self);
}
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);
sel->active_sinkpad_from_user = ! !pad;
#if DEBUG_CACHED_BUFFERS
gst_input_selector_debug_cached_buffers (sel);
#endif
gst_input_selector_set_active_pad (sel, pad);
#if DEBUG_CACHED_BUFFERS
gst_input_selector_debug_cached_buffers (sel);
#endif
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;
case PROP_SYNC_MODE:
GST_INPUT_SELECTOR_LOCK (sel);
sel->sync_mode = g_value_get_enum (value);
GST_INPUT_SELECTOR_UNLOCK (sel);
break;
case PROP_CACHE_BUFFERS:
GST_INPUT_SELECTOR_LOCK (object);
sel->cache_buffers = 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_active_pad_changed (GstInputSelector * sel,
GParamSpec * pspec, gpointer user_data)
{
/* Wake up all non-active pads in sync mode, they might be
* the active pad now */
if (sel->sync_streams)
GST_INPUT_SELECTOR_BROADCAST (sel);
}
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;
case PROP_SYNC_MODE:
GST_INPUT_SELECTOR_LOCK (object);
g_value_set_enum (value, sel->sync_mode);
GST_INPUT_SELECTOR_UNLOCK (object);
break;
case PROP_CACHE_BUFFERS:
GST_INPUT_SELECTOR_LOCK (object);
g_value_set_boolean (value, sel->cache_buffers);
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, GstObject * parent, 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 (parent);
/* Send upstream events to all sinkpads */
iter = gst_element_iterate_sink_pads (GST_ELEMENT_CAST (sel));
GST_INPUT_SELECTOR_LOCK (sel);
eventpad = gst_input_selector_get_active_sinkpad (sel);
if (eventpad) {
gst_object_ref (eventpad);
GST_INPUT_SELECTOR_UNLOCK (sel);
gst_event_ref (event);
result |= gst_pad_push_event (eventpad, event);
pushed_pads = g_list_append (pushed_pads, eventpad);
gst_object_unref (eventpad);
} else {
GST_INPUT_SELECTOR_UNLOCK (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);
pushed_pads = g_list_append (pushed_pads, eventpad);
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;
}
typedef struct
{
gboolean live;
GstClockTime min, max;
} LatencyFoldData;
static gboolean
query_latency_default_fold (const GValue * item, GValue * ret,
gpointer user_data)
{
GstPad *pad = g_value_get_object (item), *peer;
LatencyFoldData *fold_data = user_data;
GstQuery *query;
gboolean res = FALSE;
query = gst_query_new_latency ();
peer = gst_pad_get_peer (pad);
if (peer) {
res = gst_pad_peer_query (pad, query);
} else {
GST_LOG_OBJECT (pad, "No peer pad found, ignoring this pad");
}
if (res) {
gboolean live;
GstClockTime min, max;
gst_query_parse_latency (query, &live, &min, &max);
GST_LOG_OBJECT (pad, "got latency live:%s min:%" G_GINT64_FORMAT
" max:%" G_GINT64_FORMAT, live ? "true" : "false", min, max);
if (live) {
if (min > fold_data->min)
fold_data->min = min;
if (fold_data->max == GST_CLOCK_TIME_NONE)
fold_data->max = max;
else if (max < fold_data->max)
fold_data->max = max;
fold_data->live = live;
}
} else if (peer) {
GST_DEBUG_OBJECT (pad, "latency query failed");
g_value_set_boolean (ret, FALSE);
}
gst_query_unref (query);
if (peer)
gst_object_unref (peer);
return TRUE;
}
static gboolean
gst_input_selector_query_latency (GstInputSelector * sel, GstPad * pad,
GstQuery * query)
{
GstIterator *it;
GstIteratorResult res;
GValue ret = G_VALUE_INIT;
gboolean query_ret;
LatencyFoldData fold_data;
/* This is basically gst_pad_query_latency_default() but with a different
* iterator. We query all sinkpads! */
it = gst_element_iterate_sink_pads (GST_ELEMENT_CAST (sel));
if (!it) {
GST_DEBUG_OBJECT (pad, "Can't iterate internal links");
return FALSE;
}
g_value_init (&ret, G_TYPE_BOOLEAN);
retry:
fold_data.live = FALSE;
fold_data.min = 0;
fold_data.max = GST_CLOCK_TIME_NONE;
g_value_set_boolean (&ret, TRUE);
res = gst_iterator_fold (it, query_latency_default_fold, &ret, &fold_data);
switch (res) {
case GST_ITERATOR_OK:
g_assert_not_reached ();
break;
case GST_ITERATOR_DONE:
break;
case GST_ITERATOR_ERROR:
g_value_set_boolean (&ret, FALSE);
break;
case GST_ITERATOR_RESYNC:
gst_iterator_resync (it);
goto retry;
default:
g_assert_not_reached ();
break;
}
gst_iterator_free (it);
query_ret = g_value_get_boolean (&ret);
if (query_ret) {
GST_LOG_OBJECT (pad, "got latency live:%s min:%" G_GINT64_FORMAT
" max:%" G_GINT64_FORMAT, fold_data.live ? "true" : "false",
fold_data.min, fold_data.max);
if (fold_data.min > fold_data.max) {
GST_ERROR_OBJECT (pad, "minimum latency bigger than maximum latency");
}
gst_query_set_latency (query, fold_data.live, fold_data.min, fold_data.max);
} else {
GST_LOG_OBJECT (pad, "latency query failed");
}
return query_ret;
}
static gboolean
gst_input_selector_query (GstPad * pad, GstObject * parent, GstQuery * query)
{
GstInputSelector *sel = GST_INPUT_SELECTOR (parent);
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_LATENCY:
/* Query all sink pads for the latency, not just the active one */
return gst_input_selector_query_latency (sel, pad, query);
default:
return gst_pad_query_default (pad, parent, query);
}
}
/* 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_get_active_sinkpad (GstInputSelector * sel)
{
GstPad *active_sinkpad;
active_sinkpad = sel->active_sinkpad;
if (active_sinkpad == NULL) {
GValue item = G_VALUE_INIT;
GstIterator *iter = gst_element_iterate_sink_pads (GST_ELEMENT_CAST (sel));
GstIteratorResult ires;
while ((ires = gst_iterator_next (iter, &item)) == GST_ITERATOR_RESYNC)
gst_iterator_resync (iter);
if (ires == GST_ITERATOR_OK) {
/* If no pad is currently selected, we return the first usable pad to
* guarantee consistency */
active_sinkpad = sel->active_sinkpad = g_value_dup_object (&item);
g_value_reset (&item);
GST_DEBUG_OBJECT (sel, "Activating pad %s:%s",
GST_DEBUG_PAD_NAME (active_sinkpad));
} else
GST_WARNING_OBJECT (sel, "Couldn't find a default sink pad");
gst_iterator_free (iter);
}
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 sink_%u", sel->padcount);
name = g_strdup_printf ("sink_%u", 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_query_function (sinkpad,
GST_DEBUG_FUNCPTR (gst_selector_pad_query));
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_OBJECT_FLAG_SET (sinkpad, GST_PAD_FLAG_PROXY_CAPS);
GST_OBJECT_FLAG_SET (sinkpad, GST_PAD_FLAG_PROXY_ALLOCATION);
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->active_sinkpad_from_user = FALSE;
}
sel->n_pads--;
GST_INPUT_SELECTOR_UNLOCK (sel);
gst_pad_set_active (pad, FALSE);
gst_element_remove_pad (GST_ELEMENT (sel), pad);
}
static void
gst_input_selector_reset (GstInputSelector * sel)
{
GList *walk;
GST_INPUT_SELECTOR_LOCK (sel);
/* clear active pad */
if (sel->active_sinkpad && !sel->active_sinkpad_from_user) {
gst_object_unref (sel->active_sinkpad);
sel->active_sinkpad = NULL;
}
sel->eos_sent = 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_unref (selpad->tags);
selpad->tags = NULL;
}
}
sel->have_group_id = TRUE;
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->eos = 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->eos = TRUE;
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;
}
Reference in a new issue View git blame Copy permalink