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394 lines
16 KiB
C
394 lines
16 KiB
C
/* GStreamer aggregator base class
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* Copyright (C) 2014 Mathieu Duponchelle <mathieu.duponchelle@oencreed.com>
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* Copyright (C) 2014 Thibault Saunier <tsaunier@gnome.org>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __GST_AGGREGATOR_H__
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#define __GST_AGGREGATOR_H__
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#include <gst/gst.h>
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#include <gst/base/base-prelude.h>
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G_BEGIN_DECLS
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/**************************
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* GstAggregator Structs *
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*************************/
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typedef struct _GstAggregator GstAggregator;
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typedef struct _GstAggregatorPrivate GstAggregatorPrivate;
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typedef struct _GstAggregatorClass GstAggregatorClass;
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/************************
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* GstAggregatorPad API *
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***********************/
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#define GST_TYPE_AGGREGATOR_PAD (gst_aggregator_pad_get_type())
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#define GST_AGGREGATOR_PAD(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_AGGREGATOR_PAD, GstAggregatorPad))
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#define GST_AGGREGATOR_PAD_CAST(obj) ((GstAggregatorPad *)(obj))
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#define GST_AGGREGATOR_PAD_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_AGGREGATOR_PAD, GstAggregatorPadClass))
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#define GST_AGGREGATOR_PAD_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj),GST_TYPE_AGGREGATOR_PAD, GstAggregatorPadClass))
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#define GST_IS_AGGREGATOR_PAD(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_AGGREGATOR_PAD))
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#define GST_IS_AGGREGATOR_PAD_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_AGGREGATOR_PAD))
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/****************************
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* GstAggregatorPad Structs *
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***************************/
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typedef struct _GstAggregatorPad GstAggregatorPad;
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typedef struct _GstAggregatorPadClass GstAggregatorPadClass;
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typedef struct _GstAggregatorPadPrivate GstAggregatorPadPrivate;
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/**
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* GstAggregatorPad:
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* @segment: last segment received.
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*
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* The implementation the GstPad to use with #GstAggregator
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*
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* Since: 1.14
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*/
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struct _GstAggregatorPad
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{
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GstPad parent;
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/*< public >*/
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/* Protected by the OBJECT_LOCK */
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GstSegment segment;
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/* < private > */
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GstAggregatorPadPrivate * priv;
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gpointer _gst_reserved[GST_PADDING];
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};
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/**
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* GstAggregatorPadClass:
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* @flush: Optional
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* Called when the pad has received a flush stop, this is the place
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* to flush any information specific to the pad, it allows for individual
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* pads to be flushed while others might not be.
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* @skip_buffer: Optional
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* Called before input buffers are queued in the pad, return %TRUE
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* if the buffer should be skipped.
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*
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* Since: 1.14
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*/
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struct _GstAggregatorPadClass
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{
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GstPadClass parent_class;
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GstFlowReturn (*flush) (GstAggregatorPad * aggpad, GstAggregator * aggregator);
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gboolean (*skip_buffer) (GstAggregatorPad * aggpad, GstAggregator * aggregator, GstBuffer * buffer);
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/*< private >*/
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gpointer _gst_reserved[GST_PADDING_LARGE];
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};
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GST_BASE_API
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GType gst_aggregator_pad_get_type (void);
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/****************************
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* GstAggregatorPad methods *
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***************************/
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GST_BASE_API
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GstBuffer * gst_aggregator_pad_pop_buffer (GstAggregatorPad * pad);
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GST_BASE_API
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GstBuffer * gst_aggregator_pad_peek_buffer (GstAggregatorPad * pad);
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GST_BASE_API
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gboolean gst_aggregator_pad_drop_buffer (GstAggregatorPad * pad);
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GST_BASE_API
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gboolean gst_aggregator_pad_has_buffer (GstAggregatorPad * pad);
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GST_BASE_API
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gboolean gst_aggregator_pad_is_eos (GstAggregatorPad * pad);
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/*********************
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* GstAggregator API *
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********************/
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#define GST_TYPE_AGGREGATOR (gst_aggregator_get_type())
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#define GST_AGGREGATOR(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_AGGREGATOR,GstAggregator))
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#define GST_AGGREGATOR_CAST(obj) ((GstAggregator *)(obj))
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#define GST_AGGREGATOR_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_AGGREGATOR,GstAggregatorClass))
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#define GST_AGGREGATOR_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj),GST_TYPE_AGGREGATOR,GstAggregatorClass))
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#define GST_IS_AGGREGATOR(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_AGGREGATOR))
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#define GST_IS_AGGREGATOR_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_AGGREGATOR))
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#define GST_AGGREGATOR_FLOW_NEED_DATA GST_FLOW_CUSTOM_ERROR
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/**
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* GstAggregator:
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* @srcpad: the aggregator's source pad
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*
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* Aggregator base class object structure.
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*
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* Since: 1.14
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*/
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struct _GstAggregator
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{
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GstElement parent;
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/*< public >*/
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GstPad * srcpad;
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/*< private >*/
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GstAggregatorPrivate * priv;
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gpointer _gst_reserved[GST_PADDING_LARGE];
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};
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/**
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* GstAggregatorClass:
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* @flush: Optional.
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* Called after a successful flushing seek, once all the flush
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* stops have been received. Flush pad-specific data in
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* #GstAggregatorPad->flush.
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* @clip: Optional.
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* Called when a buffer is received on a sink pad, the task of
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* clipping it and translating it to the current segment falls
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* on the subclass. The function should use the segment of data
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* and the negotiated media type on the pad to perform
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* clipping of input buffer. This function takes ownership of
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* buf and should output a buffer or return NULL in
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* if the buffer should be dropped.
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* @finish_buffer: Optional.
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* Called when a subclass calls gst_aggregator_finish_buffer()
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* from their aggregate function to push out a buffer.
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* Subclasses can override this to modify or decorate buffers
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* before they get pushed out. This function takes ownership
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* of the buffer passed. Subclasses that override this method
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* should always chain up to the parent class virtual method.
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* @sink_event: Optional.
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* Called when an event is received on a sink pad, the subclass
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* should always chain up.
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* @sink_query: Optional.
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* Called when a query is received on a sink pad, the subclass
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* should always chain up.
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* @src_event: Optional.
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* Called when an event is received on the src pad, the subclass
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* should always chain up.
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* @src_query: Optional.
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* Called when a query is received on the src pad, the subclass
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* should always chain up.
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* @src_activate: Optional.
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* Called when the src pad is activated, it will start/stop its
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* pad task right after that call.
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* @aggregate: Mandatory.
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* Called when buffers are queued on all sinkpads. Classes
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* should iterate the GstElement->sinkpads and peek or steal
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* buffers from the #GstAggregatorPads. If the subclass returns
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* GST_FLOW_EOS, sending of the eos event will be taken care
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* of. Once / if a buffer has been constructed from the
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* aggregated buffers, the subclass should call _finish_buffer.
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* @stop: Optional.
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* Called when the element goes from PAUSED to READY.
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* The subclass should free all resources and reset its state.
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* @start: Optional.
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* Called when the element goes from READY to PAUSED.
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* The subclass should get ready to process
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* aggregated buffers.
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* @get_next_time: Optional.
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* Called when the element needs to know the running time of the next
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* rendered buffer for live pipelines. This causes deadline
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* based aggregation to occur. Defaults to returning
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* GST_CLOCK_TIME_NONE causing the element to wait for buffers
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* on all sink pads before aggregating.
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* @create_new_pad: Optional.
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* Called when a new pad needs to be created. Allows subclass that
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* don't have a single sink pad template to provide a pad based
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* on the provided information.
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* @update_src_caps: Lets subclasses update the #GstCaps representing
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* the src pad caps before usage. The result should end up
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* in @ret. Return %GST_AGGREGATOR_FLOW_NEED_DATA to indicate that the
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* element needs more information (caps, a buffer, etc) to
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* choose the correct caps. Should return ANY caps if the
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* stream has not caps at all.
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* @fixate_src_caps: Optional.
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* Fixate and return the src pad caps provided. The function takes
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* ownership of @caps and returns a fixated version of
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* @caps. @caps is not guaranteed to be writable.
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* @negotiated_src_caps: Optional.
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* Notifies subclasses what caps format has been negotiated
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* @decide_allocation: Optional.
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* Allows the subclass to influence the allocation choices.
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* Setup the allocation parameters for allocating output
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* buffers. The passed in query contains the result of the
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* downstream allocation query.
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* @propose_allocation: Optional.
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* Allows the subclass to handle the allocation query from upstream.
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* @negotiate: Optional.
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* Negotiate the caps with the peer (Since: 1.18).
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* @sink_event_pre_queue: Optional.
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* Called when an event is received on a sink pad before queueing up
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* serialized events. The subclass should always chain up (Since: 1.18).
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* @sink_query_pre_queue: Optional.
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* Called when a query is received on a sink pad before queueing up
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* serialized queries. The subclass should always chain up (Since: 1.18).
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*
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* The aggregator base class will handle in a thread-safe way all manners of
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* concurrent flushes, seeks, pad additions and removals, leaving to the
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* subclass the responsibility of clipping buffers, and aggregating buffers in
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* the way the implementor sees fit.
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*
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* It will also take care of event ordering (stream-start, segment, eos).
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*
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* Basically, a simple implementation will override @aggregate, and call
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* _finish_buffer from inside that function.
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*
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* Since: 1.14
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*/
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struct _GstAggregatorClass {
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GstElementClass parent_class;
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GstFlowReturn (*flush) (GstAggregator * aggregator);
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GstBuffer * (*clip) (GstAggregator * aggregator,
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GstAggregatorPad * aggregator_pad,
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GstBuffer * buf);
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GstFlowReturn (*finish_buffer) (GstAggregator * aggregator,
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GstBuffer * buffer);
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/* sinkpads virtual methods */
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gboolean (*sink_event) (GstAggregator * aggregator,
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GstAggregatorPad * aggregator_pad,
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GstEvent * event);
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gboolean (*sink_query) (GstAggregator * aggregator,
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GstAggregatorPad * aggregator_pad,
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GstQuery * query);
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/* srcpad virtual methods */
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gboolean (*src_event) (GstAggregator * aggregator,
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GstEvent * event);
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gboolean (*src_query) (GstAggregator * aggregator,
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GstQuery * query);
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gboolean (*src_activate) (GstAggregator * aggregator,
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GstPadMode mode,
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gboolean active);
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GstFlowReturn (*aggregate) (GstAggregator * aggregator,
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gboolean timeout);
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gboolean (*stop) (GstAggregator * aggregator);
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gboolean (*start) (GstAggregator * aggregator);
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GstClockTime (*get_next_time) (GstAggregator * aggregator);
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GstAggregatorPad * (*create_new_pad) (GstAggregator * self,
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GstPadTemplate * templ,
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const gchar * req_name,
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const GstCaps * caps);
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/**
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* GstAggregatorClass::update_src_caps:
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* @ret: (out) (allow-none):
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*/
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GstFlowReturn (*update_src_caps) (GstAggregator * self,
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GstCaps * caps,
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GstCaps ** ret);
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GstCaps * (*fixate_src_caps) (GstAggregator * self,
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GstCaps * caps);
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gboolean (*negotiated_src_caps) (GstAggregator * self,
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GstCaps * caps);
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gboolean (*decide_allocation) (GstAggregator * self,
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GstQuery * query);
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gboolean (*propose_allocation) (GstAggregator * self,
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GstAggregatorPad * pad,
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GstQuery * decide_query,
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GstQuery * query);
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gboolean (*negotiate) (GstAggregator * self);
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gboolean (*sink_event_pre_queue) (GstAggregator * aggregator,
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GstAggregatorPad * aggregator_pad,
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GstEvent * event);
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gboolean (*sink_query_pre_queue) (GstAggregator * aggregator,
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GstAggregatorPad * aggregator_pad,
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GstQuery * query);
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/*< private >*/
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gpointer _gst_reserved[GST_PADDING_LARGE-3];
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};
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/************************************
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* GstAggregator convenience macros *
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***********************************/
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/**
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* GST_AGGREGATOR_SRC_PAD:
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* @agg: a #GstAggregator
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*
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* Convenience macro to access the source pad of #GstAggregator
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*
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* Since: 1.6
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*/
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#define GST_AGGREGATOR_SRC_PAD(agg) (((GstAggregator *)(agg))->srcpad)
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/*************************
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* GstAggregator methods *
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************************/
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GST_BASE_API
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GstFlowReturn gst_aggregator_finish_buffer (GstAggregator * aggregator,
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GstBuffer * buffer);
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GST_BASE_API
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void gst_aggregator_set_src_caps (GstAggregator * self,
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GstCaps * caps);
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GST_BASE_API
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gboolean gst_aggregator_negotiate (GstAggregator * self);
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GST_BASE_API
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void gst_aggregator_set_latency (GstAggregator * self,
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GstClockTime min_latency,
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GstClockTime max_latency);
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GST_BASE_API
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GType gst_aggregator_get_type(void);
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GST_BASE_API
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GstClockTime gst_aggregator_get_latency (GstAggregator * self);
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GST_BASE_API
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GstBufferPool * gst_aggregator_get_buffer_pool (GstAggregator * self);
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GST_BASE_API
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void gst_aggregator_get_allocator (GstAggregator * self,
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GstAllocator ** allocator,
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GstAllocationParams * params);
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GST_BASE_API
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GstClockTime gst_aggregator_simple_get_next_time (GstAggregator * self);
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G_END_DECLS
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G_DEFINE_AUTOPTR_CLEANUP_FUNC(GstAggregator, gst_object_unref)
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G_DEFINE_AUTOPTR_CLEANUP_FUNC(GstAggregatorPad, gst_object_unref)
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#endif /* __GST_AGGREGATOR_H__ */
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