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efb8033bac
Original commit message from CVS: * gst/gstchildproxy.h: * libs/gst/base/gstbasesink.h: * libs/gst/base/gstbasesrc.h: * libs/gst/base/gstbasetransform.h: More docs coverage and some ChangeLog surgery (add missing names)
200 lines
7.3 KiB
C
200 lines
7.3 KiB
C
/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2000 Wim Taymans <wtay@chello.be>
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*
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* gstbasesink.h:
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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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifndef __GST_BASE_SINK_H__
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#define __GST_BASE_SINK_H__
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#include <gst/gst.h>
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G_BEGIN_DECLS
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#define GST_TYPE_BASE_SINK (gst_base_sink_get_type())
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#define GST_BASE_SINK(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_BASE_SINK,GstBaseSink))
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#define GST_BASE_SINK_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_BASE_SINK,GstBaseSinkClass))
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#define GST_BASE_SINK_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_BASE_SINK, GstBaseSinkClass))
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#define GST_IS_BASE_SINK(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_BASE_SINK))
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#define GST_IS_BASE_SINK_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_BASE_SINK))
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#define GST_BASE_SINK_CAST(obj) ((GstBaseSink *) (obj))
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/**
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* GST_BASE_SINK_PAD:
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* @obj: base sink instance
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*
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* Gives the pointer to the #GstPad object of the element.
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*/
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#define GST_BASE_SINK_PAD(obj) (GST_BASE_SINK_CAST (obj)->sinkpad)
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typedef struct _GstBaseSink GstBaseSink;
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typedef struct _GstBaseSinkClass GstBaseSinkClass;
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typedef struct _GstBaseSinkPrivate GstBaseSinkPrivate;
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/**
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* GstBaseSink:
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* @element: the parent element.
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*
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* The opaque #GstBaseSink data structure.
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*/
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struct _GstBaseSink {
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GstElement element;
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/*< protected >*/
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GstPad *sinkpad;
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GstActivateMode pad_mode;
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/*< protected >*/ /* with LOCK */
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guint64 offset;
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gboolean can_activate_pull;
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gboolean can_activate_push;
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/*< protected >*/ /* with PREROLL_LOCK */
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GQueue *preroll_queue;
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gint preroll_queue_max_len;
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gint preroll_queued;
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gint buffers_queued;
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gint events_queued;
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gboolean eos;
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gboolean eos_queued;
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gboolean need_preroll;
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gboolean have_preroll;
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gboolean playing_async;
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/*< protected >*/ /* with STREAM_LOCK */
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gboolean have_newsegment;
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GstSegment segment;
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/*< private >*/ /* with LOCK */
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GstClockID clock_id;
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GstClockTime end_time;
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gboolean sync;
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gboolean flushing;
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/*< private >*/
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union {
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struct {
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/* segment used for clipping incomming buffers */
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GstSegment *clip_segment;
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/* max amount of time a buffer can be late, -1 no limit. */
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gint64 max_lateness;
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} ABI;
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gpointer _gst_reserved[GST_PADDING_LARGE - 1];
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} abidata;
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GstBaseSinkPrivate *priv;
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};
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/**
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* GstBaseSinkClass:
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* @parent_class: Element parent class
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* @get_caps: Called to get sink pad caps from the subclass
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* @set_caps: Notify subclass of changed caps
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* @buffer_alloc: Subclasses can override to perform custom buffer allocations
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* @get_times: Called to get the start and end times for synchronising
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* the passed buffer to the clock
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* @start: Start processing. Ideal for opening resources in the subclass
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* @stop: Stop processing. Subclasses should use this to close resources.
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* @unlock: Unlock any pending access to the resource. Subclasses should
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* unblock any blocked function ASAP
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* @event: Override this to handle events arriving on the sink pad
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* @preroll: Called to present the preroll buffer if desired
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* @render: Called when a buffer should be presented or output, at the
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* correct moment if the #GstBaseSink has been set to sync to the clock.
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* @async_play: Subclasses should override this when they need to perform
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* special processing when changing to the PLAYING state asynchronously.
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* Called with the OBJECT_LOCK held.
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* @activate_pull: Subclasses should override this when they can provide an
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* alternate method of spawning a thread to drive the pipeline in pull mode.
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* Should start or stop the pulling thread, depending on the value of the
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* "active" argument. Called after actually activating the sink pad in pull
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* mode. The default implementation starts a task on the sink pad.
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* @fixate: Only useful in pull mode, this vmethod will be called in response to
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* gst_pad_fixate_caps() being called on the sink pad. Implement if you have
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* ideas about what should be the default values for the caps you support.
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*
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* Subclasses can override any of the available virtual methods or not, as
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* needed. At the minimum, the @render method should be overridden to
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* output/present buffers.
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*/
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struct _GstBaseSinkClass {
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GstElementClass parent_class;
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/* get caps from subclass */
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GstCaps* (*get_caps) (GstBaseSink *sink);
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/* notify subclass of new caps */
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gboolean (*set_caps) (GstBaseSink *sink, GstCaps *caps);
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/* allocate a new buffer with given caps */
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GstFlowReturn (*buffer_alloc) (GstBaseSink *sink, guint64 offset, guint size,
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GstCaps *caps, GstBuffer **buf);
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/* get the start and end times for syncing on this buffer */
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void (*get_times) (GstBaseSink *sink, GstBuffer *buffer,
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GstClockTime *start, GstClockTime *end);
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/* start and stop processing, ideal for opening/closing the resource */
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gboolean (*start) (GstBaseSink *sink);
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gboolean (*stop) (GstBaseSink *sink);
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/* unlock any pending access to the resource. subclasses should unlock
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* any function ASAP. */
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gboolean (*unlock) (GstBaseSink *sink);
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/* notify subclass of event, preroll buffer or real buffer */
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gboolean (*event) (GstBaseSink *sink, GstEvent *event);
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GstFlowReturn (*preroll) (GstBaseSink *sink, GstBuffer *buffer);
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GstFlowReturn (*render) (GstBaseSink *sink, GstBuffer *buffer);
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/* ABI additions */
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/* when an ASYNC state change to PLAYING happens */ /* with LOCK */
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GstStateChangeReturn (*async_play) (GstBaseSink *sink);
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/* start or stop a pulling thread */
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gboolean (*activate_pull)(GstBaseSink *sink, gboolean active);
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/* fixate sink caps during pull-mode negotiation */
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void (*fixate) (GstBaseSink *sink, GstCaps *caps);
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/*< private >*/
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gpointer _gst_reserved[GST_PADDING_LARGE-3];
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};
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GType gst_base_sink_get_type(void);
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GstFlowReturn gst_base_sink_wait_preroll (GstBaseSink *sink);
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void gst_base_sink_set_sync (GstBaseSink *sink, gboolean sync);
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gboolean gst_base_sink_get_sync (GstBaseSink *sink);
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void gst_base_sink_set_max_lateness (GstBaseSink *sink, gint64 max_lateness);
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gint64 gst_base_sink_get_max_lateness (GstBaseSink *sink);
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void gst_base_sink_set_qos_enabled (GstBaseSink *sink, gboolean enabled);
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gboolean gst_base_sink_is_qos_enabled (GstBaseSink *sink);
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gboolean gst_base_sink_query_latency (GstBaseSink *sink, gboolean *live, gboolean *upstream_live,
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GstClockTime *min_latency, GstClockTime *max_latency);
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GstClockTime gst_base_sink_get_latency (GstBaseSink *sink);
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G_END_DECLS
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#endif /* __GST_BASE_SINK_H__ */
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