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-rw-r--r--gst/switch/gstswitch-marshal.list4
-rw-r--r--gst/switch/gstswitch.c163
-rw-r--r--gst/switch/gstswitch.h4
3 files changed, 117 insertions, 54 deletions
diff --git a/gst/switch/gstswitch-marshal.list b/gst/switch/gstswitch-marshal.list
index 56014826..97c741cb 100644
--- a/gst/switch/gstswitch-marshal.list
+++ b/gst/switch/gstswitch-marshal.list
@@ -1,2 +1,2 @@
-UINT64:VOID
-VOID:STRING,UINT64,UINT64
+INT64:VOID
+VOID:STRING,INT64,INT64
diff --git a/gst/switch/gstswitch.c b/gst/switch/gstswitch.c
index 5e2e4462..fd4a4a33 100644
--- a/gst/switch/gstswitch.c
+++ b/gst/switch/gstswitch.c
@@ -3,6 +3,7 @@
* Copyright (C) 2005 Ronald S. Bultje <rbultje@ronald.bitfreak.net>
* Copyright (C) 2005 Jan Schmidt <thaytan@mad.scientist.com>
* Copyright (C) 2007 Wim Taymans <wim.taymans@gmail.com>
+ * Copyright (C) 2007 Andy Wingo <wingo@pobox.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
@@ -60,7 +61,7 @@ enum
enum
{
- PAD_PROP_LAST_STOP_TIME = 1
+ PAD_PROP_RUNNING_TIME = 1
};
enum
@@ -119,6 +120,7 @@ static void gst_selector_pad_get_property (GObject * object,
static GstPadClass *selector_pad_parent_class = NULL;
+static gint64 gst_selector_pad_get_running_time (GstSelectorPad * pad);
static void gst_selector_pad_reset (GstSelectorPad * pad);
static gboolean gst_selector_pad_event (GstPad * pad, GstEvent * event);
static GstCaps *gst_selector_pad_getcaps (GstPad * pad);
@@ -163,10 +165,9 @@ gst_selector_pad_class_init (GstSelectorPadClass * klass)
gobject_class->get_property =
GST_DEBUG_FUNCPTR (gst_selector_pad_get_property);
- g_object_class_install_property (gobject_class, PAD_PROP_LAST_STOP_TIME,
- g_param_spec_uint64 ("last-stop-time", "Last stop time",
- "Last stop time seen on pad", 0, G_MAXUINT64, GST_CLOCK_TIME_NONE,
- G_PARAM_READABLE));
+ g_object_class_install_property (gobject_class, PAD_PROP_RUNNING_TIME,
+ g_param_spec_int64 ("running-time", "Running time",
+ "Running time of stream on pad", 0, G_MAXINT64, 0, G_PARAM_READABLE));
gobject_class->finalize = gst_selector_pad_finalize;
}
@@ -174,6 +175,7 @@ gst_selector_pad_class_init (GstSelectorPadClass * klass)
static void
gst_selector_pad_init (GstSelectorPad * pad)
{
+ gst_selector_pad_reset (pad);
}
static void
@@ -193,21 +195,39 @@ gst_selector_pad_get_property (GObject * object, guint prop_id,
GstSelectorPad *spad = GST_SELECTOR_PAD_CAST (object);
switch (prop_id) {
- case PAD_PROP_LAST_STOP_TIME:{
- GST_OBJECT_LOCK (object);
- if (spad->active)
- g_value_set_uint64 (value, spad->segment.last_stop);
- else
- g_value_set_uint64 (value, GST_CLOCK_TIME_NONE);
- GST_OBJECT_UNLOCK (object);
+ case PAD_PROP_RUNNING_TIME:
+ g_value_set_int64 (value, gst_selector_pad_get_running_time (spad));
break;
- }
+
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
+static gint64
+gst_selector_pad_get_running_time (GstSelectorPad * pad)
+{
+ gint64 ret = 0;
+
+ GST_OBJECT_LOCK (pad);
+
+ if (pad->active) {
+ gint64 last_stop = pad->segment.last_stop;
+
+ if (last_stop >= 0)
+ ret = gst_segment_to_running_time (&pad->segment, GST_FORMAT_TIME,
+ last_stop);
+ }
+
+ GST_OBJECT_UNLOCK (pad);
+
+ GST_DEBUG_OBJECT (pad, "running time: %" GST_TIME_FORMAT,
+ GST_TIME_ARGS (ret));
+
+ return ret;
+}
+
static void
gst_selector_pad_reset (GstSelectorPad * pad)
{
@@ -446,9 +466,9 @@ static GstStateChangeReturn gst_stream_selector_change_state (GstElement *
element, GstStateChange transition);
static GList *gst_stream_selector_get_linked_pads (GstPad * pad);
static GstCaps *gst_stream_selector_getcaps (GstPad * pad);
-static GstClockTime gst_stream_selector_block (GstStreamSelector * self);
+static gint64 gst_stream_selector_block (GstStreamSelector * self);
static void gst_stream_selector_switch (GstStreamSelector * self,
- const gchar * pad_name, GstClockTime stop_time, GstClockTime start_time);
+ const gchar * pad_name, gint64 stop_time, gint64 start_time);
static GstElementClass *parent_class = NULL;
@@ -512,33 +532,61 @@ gst_stream_selector_class_init (GstStreamSelectorClass * klass)
/**
* GstStreamSelector::block:
- * @streamselector: the streamselector element to emit this signal on
+ * @streamselector: the #GstStreamSelector
*
* Block all sink pads in preparation for a switch. Returns the stop time of
- * the current switch segment, or #GST_CLOCK_TIME_NONE if there is no current
+ * the current switch segment, as a running time, or 0 if there is no current
* active pad or the current active pad never received data.
*/
gst_stream_selector_signals[SIGNAL_BLOCK] =
g_signal_new ("block", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstStreamSelectorClass, block),
- NULL, NULL, gst_switch_marshal_UINT64__VOID, G_TYPE_UINT64, 0);
+ NULL, NULL, gst_switch_marshal_INT64__VOID, G_TYPE_INT64, 0);
/**
* GstStreamSelector::switch:
- * @streamselector: the streamselector element to emit this signal on
+ * @streamselector: the #GstStreamSelector
* @pad: name of pad to switch to
- * @stop_time: time at which to close the previous segment, or
- * #GST_CLOCK_TIME_NONE for the last time on the previously
- * active pad
- * @start_time: start time for new segment, or foo
+ * @stop_time: running time at which to close the previous segment, or -1
+ * to use the running time of the previously active sink pad
+ * @start_time: running time at which to start the new segment, or -1 to
+ * use the running time of the newly active sink pad
+ *
+ * Switch to a new feed. The segment opened by the previously active pad, if
+ * any, will be closed, and a new segment opened before data flows again.
+ *
+ * This signal must be emitted when the element has been blocked via the <link
+ * linkend="GstStreamSelector-block">block</link> signal.
+ *
+ * If you have a stream with only one switch element, such as an audio-only
+ * stream, a stream switch should be performed by first emitting the block
+ * signal, and then emitting the switch signal with -1 for the stop and start
+ * time values.
*
- * Switch the given open file descriptor to multifdsink to write to and
- * specify the burst parameters for the new connection.
+ * The intention of the @stop_time and @start_time arguments is to allow
+ * multiple switch elements to switch and maintain stream synchronization.
+ * When switching a stream with multiple feeds, you will need as many switch
+ * elements as you have feeds. For example, a feed with audio and video will
+ * have one switch element between the audio feeds and one for video.
+ *
+ * A switch over multiple switch elements should be performed as follows:
+ * First, emit the <link linkend="GstStreamSelector-block">block</link>
+ * signal, collecting the returned values. The maximum running time returned
+ * by block should then be used as the time at which to close the previous
+ * segment.
+ *
+ * Then, query the running times of the new audio and video pads that you will
+ * switch to. Naturally, these pads are on separate switch elements. Take the
+ * minimum running time for those streams and use it for the time at which to
+ * open the new segment.
+ *
+ * If @pad is the same as the current active pad, the element will cancel any
+ * previous block without adjusting segments.
*/
gst_stream_selector_signals[SIGNAL_SWITCH] =
g_signal_new ("switch", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstStreamSelectorClass, switch_),
- NULL, NULL, gst_switch_marshal_VOID__STRING_UINT64_UINT64,
- G_TYPE_NONE, 3, G_TYPE_STRING, G_TYPE_UINT64, G_TYPE_UINT64);
+ NULL, NULL, gst_switch_marshal_VOID__STRING_INT64_INT64,
+ G_TYPE_NONE, 3, G_TYPE_STRING, G_TYPE_INT64, G_TYPE_INT64);
klass->block = GST_DEBUG_FUNCPTR (gst_stream_selector_block);
klass->switch_ = GST_DEBUG_FUNCPTR (gst_stream_selector_switch);
@@ -580,9 +628,32 @@ gst_stream_selector_dispose (GObject * object)
G_OBJECT_CLASS (parent_class)->dispose (object);
}
+/* Solve the following equation for B.timestamp, and set that as the segment
+ * stop:
+ * B.running_time = (B.timestamp - NS.start) / NS.abs_rate + NS.accum
+ */
+static gint64
+gst_segment_get_timestamp (GstSegment * segment, gint64 running_time)
+{
+ return (running_time - segment->accum) * segment->abs_rate + segment->start;
+}
+
+static void
+gst_segment_set_stop (GstSegment * segment, gint64 running_time)
+{
+ segment->stop = gst_segment_get_timestamp (segment, running_time);
+ segment->last_stop = -1;
+}
+
+static void
+gst_segment_set_start (GstSegment * segment, gint64 running_time)
+{
+ segment->start = gst_segment_get_timestamp (segment, running_time);
+}
+
static void
gst_stream_selector_set_active_pad (GstStreamSelector * self,
- const gchar * pad_name, GstClockTime stop_time, GstClockTime start_time)
+ const gchar * pad_name, gint64 stop_time, gint64 start_time)
{
GstPad *pad;
GstSelectorPad *old, *new;
@@ -601,20 +672,18 @@ gst_stream_selector_set_active_pad (GstStreamSelector * self,
old = GST_SELECTOR_PAD_CAST (self->active_sinkpad);
new = GST_SELECTOR_PAD_CAST (pad);
- if (old && old->active && !self->pending_stop
- && GST_CLOCK_TIME_IS_VALID (stop_time)) {
+ if (old && old->active && !self->pending_stop && stop_time >= 0) {
/* schedule a last_stop update if one isn't already scheduled, and a
segment has been pushed before. */
memcpy (&self->pending_stop_segment, &old->segment,
sizeof (self->pending_stop_segment));
- gst_segment_set_last_stop (&self->pending_stop_segment,
- old->segment.format, stop_time);
+ gst_segment_set_stop (&self->pending_stop_segment, stop_time);
self->pending_stop = TRUE;
}
- if (new && GST_CLOCK_TIME_IS_VALID (start_time)) {
+ if (new && new->active && start_time >= 0) {
/* schedule a new segment push */
- new->segment.start = start_time;
+ gst_segment_set_start (&new->segment, start_time);
new->segment_pending = TRUE;
}
@@ -842,10 +911,11 @@ gst_stream_selector_change_state (GstElement * element,
return result;
}
-static GstClockTime
+static gint64
gst_stream_selector_block (GstStreamSelector * self)
{
- GstClockTime ret = GST_CLOCK_TIME_NONE;
+ gint64 ret = 0;
+ GstSelectorPad *spad;
GST_OBJECT_LOCK (self);
@@ -853,20 +923,12 @@ gst_stream_selector_block (GstStreamSelector * self)
GST_WARNING_OBJECT (self, "switch already blocked");
self->blocked = TRUE;
+ spad = GST_SELECTOR_PAD_CAST (self->active_sinkpad);
- if (self->active_sinkpad) {
- GstSelectorPad *spad = GST_SELECTOR_PAD_CAST (self->active_sinkpad);
-
- if (spad->active) {
- ret = spad->segment.last_stop;
- GST_DEBUG_OBJECT (self, "last stop on %" GST_PTR_FORMAT ": %"
- GST_TIME_FORMAT, spad, GST_TIME_ARGS (ret));
- } else {
- GST_DEBUG_OBJECT (self, "pad %" GST_PTR_FORMAT " never got data", spad);
- }
- } else {
+ if (self->active_sinkpad)
+ ret = gst_selector_pad_get_running_time (spad);
+ else
GST_DEBUG_OBJECT (self, "no active pad while blocking");
- }
GST_OBJECT_UNLOCK (self);
@@ -884,7 +946,7 @@ gst_stream_selector_push_pending_stop (GstStreamSelector * self)
GstSegment *seg = &self->pending_stop_segment;
event = gst_event_new_new_segment_full (TRUE, seg->rate,
- seg->applied_rate, seg->format, seg->start, seg->last_stop, seg->time);
+ seg->applied_rate, seg->format, seg->start, seg->stop, seg->stop);
self->pending_stop = FALSE;
}
@@ -895,9 +957,10 @@ gst_stream_selector_push_pending_stop (GstStreamSelector * self)
gst_pad_push_event (self->srcpad, event);
}
+/* stop_time and start_time are running times */
static void
gst_stream_selector_switch (GstStreamSelector * self, const gchar * pad_name,
- GstClockTime stop_time, GstClockTime start_time)
+ gint64 stop_time, gint64 start_time)
{
g_return_if_fail (self->blocked == TRUE);
diff --git a/gst/switch/gstswitch.h b/gst/switch/gstswitch.h
index b1699593..75b20ebf 100644
--- a/gst/switch/gstswitch.h
+++ b/gst/switch/gstswitch.h
@@ -58,9 +58,9 @@ struct _GstStreamSelector {
struct _GstStreamSelectorClass {
GstElementClass parent_class;
- GstClockTime (*block) (GstStreamSelector *self);
+ gint64 (*block) (GstStreamSelector *self);
void (*switch_) (GstStreamSelector *self, const gchar *pad_name,
- GstClockTime stop_time, GstClockTime start_time);
+ gint64 stop_time, gint64 start_time);
};
GType gst_stream_selector_get_type (void);
generated by cgit v1.2.1 (git 2.18.0) at 2024-07-01 11:43:52 +0000