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aggregator: add buffer-consumed pad signal

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The signal will be emitted when a buffer was consumed on
a pad, if the newly-added "emit-signals" property has been
set to TRUE.

Handlers connected to the signal will receive a valid reference on
the consumed buffer, allowing for example the retrieval of metas in
order to forward them once an output buffer is pushed out.
This commit is contained in:
Mathieu Duponchelle 2019-04-01 12:22:49 +02:00 committed by Mathieu Duponchelle
parent 90beb712a0
commit ae57b1c76d
1 changed files with 92 additions and 6 deletions
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98
libs/gst/base/gstaggregator.c
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@ -130,7 +130,8 @@ static GstClockTime gst_aggregator_get_latency_property (GstAggregator * agg);
static GstClockTime gst_aggregator_get_latency_unlocked (GstAggregator * self);
static void gst_aggregator_pad_buffer_consumed (GstAggregatorPad * pad);
static void gst_aggregator_pad_buffer_consumed (GstAggregatorPad * pad,
GstBuffer * buffer);
GST_DEBUG_CATEGORY_STATIC (aggregator_debug);
#define GST_CAT_DEFAULT aggregator_debug
@ -261,6 +262,9 @@ struct _GstAggregatorPadPrivate
* the chain function is also happening.
*/
GMutex flush_lock;
/* properties */
gboolean emit_signals;
};
/* Must be called with PAD_LOCK held */
@ -817,7 +821,7 @@ gst_aggregator_pad_skip_buffers (GstElement * self, GstPad * epad,
if (GST_IS_BUFFER (item->data)
&& klass->skip_buffer (aggpad, agg, item->data)) {
GST_LOG_OBJECT (aggpad, "Skipping %" GST_PTR_FORMAT, item->data);
gst_aggregator_pad_buffer_consumed (aggpad);
gst_aggregator_pad_buffer_consumed (aggpad, GST_BUFFER (item->data));
gst_buffer_unref (item->data);
g_queue_delete_link (&aggpad->priv->data, item);
} else {
@ -2821,6 +2825,22 @@ gst_aggregator_pad_activate_mode_func (GstPad * pad,
************************************/
G_DEFINE_TYPE_WITH_PRIVATE (GstAggregatorPad, gst_aggregator_pad, GST_TYPE_PAD);
#define DEFAULT_PAD_EMIT_SIGNALS FALSE
enum
{
PAD_PROP_0,
PAD_PROP_EMIT_SIGNALS,
};
enum
{
PAD_SIGNAL_BUFFER_CONSUMED,
PAD_LAST_SIGNAL,
};
static guint gst_aggregator_pad_signals[PAD_LAST_SIGNAL] = { 0 };
static void
gst_aggregator_pad_constructed (GObject * object)
{
@ -2860,6 +2880,38 @@ gst_aggregator_pad_dispose (GObject * object)
G_OBJECT_CLASS (gst_aggregator_pad_parent_class)->dispose (object);
}
static void
gst_aggregator_pad_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstAggregatorPad *pad = GST_AGGREGATOR_PAD (object);
switch (prop_id) {
case PAD_PROP_EMIT_SIGNALS:
pad->priv->emit_signals = g_value_get_boolean (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_aggregator_pad_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstAggregatorPad *pad = GST_AGGREGATOR_PAD (object);
switch (prop_id) {
case PAD_PROP_EMIT_SIGNALS:
g_value_set_boolean (value, pad->priv->emit_signals);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_aggregator_pad_class_init (GstAggregatorPadClass * klass)
{
@ -2868,6 +2920,35 @@ gst_aggregator_pad_class_init (GstAggregatorPadClass * klass)
gobject_class->constructed = gst_aggregator_pad_constructed;
gobject_class->finalize = gst_aggregator_pad_finalize;
gobject_class->dispose = gst_aggregator_pad_dispose;
gobject_class->set_property = gst_aggregator_pad_set_property;
gobject_class->get_property = gst_aggregator_pad_get_property;
/**
* GstAggregatorPad::buffer-consumed:
*
* Signals that a buffer was consumed. As aggregator pads store buffers
* in an internal queue, there is no direct match between input and output
* buffers at any given time. This signal can be useful to forward metas
* such as #GstVideoTimeCodeMeta or #GstVideoCaptionMeta at the right time.
*
* Since: 1.16
*/
gst_aggregator_pad_signals[PAD_SIGNAL_BUFFER_CONSUMED] =
g_signal_new ("buffer-consumed", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST, 0, NULL, NULL, g_cclosure_marshal_generic,
G_TYPE_NONE, 1, GST_TYPE_BUFFER);
/**
* GstAggregatorPad:emit-signals:
*
* Enables the emission of signals such as #GstAggregatorPad::buffer-consumed
*
* Since: 1.16
*/
g_object_class_install_property (gobject_class, PAD_PROP_EMIT_SIGNALS,
g_param_spec_boolean ("emit-signals", "Emit signals",
"Send signals to signal data consumption", DEFAULT_PAD_EMIT_SIGNALS,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
}
static void
@ -2883,14 +2964,19 @@ gst_aggregator_pad_init (GstAggregatorPad * pad)
gst_aggregator_pad_reset_unlocked (pad);
pad->priv->negotiated = FALSE;
pad->priv->emit_signals = DEFAULT_PAD_EMIT_SIGNALS;
}
/* Must be called with the PAD_LOCK held */
static void
gst_aggregator_pad_buffer_consumed (GstAggregatorPad * pad)
gst_aggregator_pad_buffer_consumed (GstAggregatorPad * pad, GstBuffer * buffer)
{
pad->priv->num_buffers--;
GST_TRACE_OBJECT (pad, "Consuming buffer");
GST_TRACE_OBJECT (pad, "Consuming buffer %" GST_PTR_FORMAT, buffer);
if (buffer && pad->priv->emit_signals) {
g_signal_emit (pad, gst_aggregator_pad_signals[PAD_SIGNAL_BUFFER_CONSUMED],
0, buffer);
}
PAD_BROADCAST_EVENT (pad);
}
@ -2927,7 +3013,7 @@ gst_aggregator_pad_clip_buffer_unlocked (GstAggregatorPad * pad)
buffer = aggclass->clip (self, pad, buffer);
if (buffer == NULL) {
gst_aggregator_pad_buffer_consumed (pad);
gst_aggregator_pad_buffer_consumed (pad, buffer);
GST_TRACE_OBJECT (pad, "Clipping consumed the buffer");
}
}
@ -2966,7 +3052,7 @@ gst_aggregator_pad_pop_buffer (GstAggregatorPad * pad)
if (buffer) {
pad->priv->clipped_buffer = NULL;
gst_aggregator_pad_buffer_consumed (pad);
gst_aggregator_pad_buffer_consumed (pad, buffer);
GST_DEBUG_OBJECT (pad, "Consumed: %" GST_PTR_FORMAT, buffer);
}