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