/* GStreamer * Copyright (C) 1999,2000 Erik Walthinsen * 2000 Wim Taymans * * gstbasesink.h: * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ #ifndef __GST_BASE_SINK_H__ #define __GST_BASE_SINK_H__ #include G_BEGIN_DECLS #define GST_TYPE_BASE_SINK (gst_base_sink_get_type()) #define GST_BASE_SINK(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_BASE_SINK,GstBaseSink)) #define GST_BASE_SINK_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_BASE_SINK,GstBaseSinkClass)) #define GST_BASE_SINK_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_BASE_SINK, GstBaseSinkClass)) #define GST_IS_BASE_SINK(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_BASE_SINK)) #define GST_IS_BASE_SINK_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_BASE_SINK)) #define GST_BASE_SINK_CAST(obj) ((GstBaseSink *) (obj)) /** * GST_BASE_SINK_PAD: * @obj: base sink instance * * Gives the pointer to the #GstPad object of the element. */ #define GST_BASE_SINK_PAD(obj) (GST_BASE_SINK_CAST (obj)->sinkpad) typedef struct _GstBaseSink GstBaseSink; typedef struct _GstBaseSinkClass GstBaseSinkClass; typedef struct _GstBaseSinkPrivate GstBaseSinkPrivate; /** * GstBaseSink: * @element: the parent element. * * The opaque #GstBaseSink data structure. */ struct _GstBaseSink { GstElement element; /*< protected >*/ GstPad *sinkpad; GstActivateMode pad_mode; /*< protected >*/ /* with LOCK */ guint64 offset; gboolean can_activate_pull; gboolean can_activate_push; /*< protected >*/ /* with PREROLL_LOCK */ GQueue *preroll_queue; gint preroll_queue_max_len; gint preroll_queued; gint buffers_queued; gint events_queued; gboolean eos; gboolean eos_queued; gboolean need_preroll; gboolean have_preroll; gboolean playing_async; /*< protected >*/ /* with STREAM_LOCK */ gboolean have_newsegment; GstSegment segment; /*< private >*/ /* with LOCK */ GstClockID clock_id; GstClockTime end_time; gboolean sync; gboolean flushing; /*< private >*/ union { struct { /* segment used for clipping incomming buffers */ GstSegment *clip_segment; /* max amount of time a buffer can be late, -1 no limit. */ gint64 max_lateness; } ABI; gpointer _gst_reserved[GST_PADDING_LARGE - 1]; } abidata; GstBaseSinkPrivate *priv; }; /** * GstBaseSinkClass: * @parent_class: Element parent class * @get_caps: Called to get sink pad caps from the subclass * @set_caps: Notify subclass of changed caps * @buffer_alloc: Subclasses can override to perform custom buffer allocations * @get_times: Called to get the start and end times for synchronising * the passed buffer to the clock * @start: Start processing. Ideal for opening resources in the subclass * @stop: Stop processing. Subclasses should use this to close resources. * @unlock: Unlock any pending access to the resource. Subclasses should * unblock any blocked function ASAP * @unlock_stop: Clear the previous unlock request. Subclasses should clear * any state they set during unlock(), such as clearing command queues. * @event: Override this to handle events arriving on the sink pad * @preroll: Called to present the preroll buffer if desired * @render: Called when a buffer should be presented or output, at the * correct moment if the #GstBaseSink has been set to sync to the clock. * @async_play: Subclasses should override this when they need to perform * special processing when changing to the PLAYING state asynchronously. * Called with the OBJECT_LOCK held. * @activate_pull: Subclasses should override this when they can provide an * alternate method of spawning a thread to drive the pipeline in pull mode. * Should start or stop the pulling thread, depending on the value of the * "active" argument. Called after actually activating the sink pad in pull * mode. The default implementation starts a task on the sink pad. * @fixate: Only useful in pull mode, this vmethod will be called in response to * gst_pad_fixate_caps() being called on the sink pad. Implement if you have * ideas about what should be the default values for the caps you support. * * Subclasses can override any of the available virtual methods or not, as * needed. At the minimum, the @render method should be overridden to * output/present buffers. */ struct _GstBaseSinkClass { GstElementClass parent_class; /* get caps from subclass */ GstCaps* (*get_caps) (GstBaseSink *sink); /* notify subclass of new caps */ gboolean (*set_caps) (GstBaseSink *sink, GstCaps *caps); /* allocate a new buffer with given caps */ GstFlowReturn (*buffer_alloc) (GstBaseSink *sink, guint64 offset, guint size, GstCaps *caps, GstBuffer **buf); /* get the start and end times for syncing on this buffer */ void (*get_times) (GstBaseSink *sink, GstBuffer *buffer, GstClockTime *start, GstClockTime *end); /* start and stop processing, ideal for opening/closing the resource */ gboolean (*start) (GstBaseSink *sink); gboolean (*stop) (GstBaseSink *sink); /* unlock any pending access to the resource. subclasses should unlock * any function ASAP. */ gboolean (*unlock) (GstBaseSink *sink); /* notify subclass of event, preroll buffer or real buffer */ gboolean (*event) (GstBaseSink *sink, GstEvent *event); GstFlowReturn (*preroll) (GstBaseSink *sink, GstBuffer *buffer); GstFlowReturn (*render) (GstBaseSink *sink, GstBuffer *buffer); /* ABI additions */ /* when an ASYNC state change to PLAYING happens */ /* with LOCK */ GstStateChangeReturn (*async_play) (GstBaseSink *sink); /* start or stop a pulling thread */ gboolean (*activate_pull)(GstBaseSink *sink, gboolean active); /* fixate sink caps during pull-mode negotiation */ void (*fixate) (GstBaseSink *sink, GstCaps *caps); /* Clear a previously indicated unlock request not that unlocking is * complete. Sub-classes should clear any command queue or indicator they * set during unlock */ gboolean (*unlock_stop) (GstBaseSink *sink); /*< private >*/ gpointer _gst_reserved[GST_PADDING_LARGE-4]; }; GType gst_base_sink_get_type(void); GstFlowReturn gst_base_sink_wait_preroll (GstBaseSink *sink); void gst_base_sink_set_sync (GstBaseSink *sink, gboolean sync); gboolean gst_base_sink_get_sync (GstBaseSink *sink); void gst_base_sink_set_max_lateness (GstBaseSink *sink, gint64 max_lateness); gint64 gst_base_sink_get_max_lateness (GstBaseSink *sink); void gst_base_sink_set_qos_enabled (GstBaseSink *sink, gboolean enabled); gboolean gst_base_sink_is_qos_enabled (GstBaseSink *sink); gboolean gst_base_sink_query_latency (GstBaseSink *sink, gboolean *live, gboolean *upstream_live, GstClockTime *min_latency, GstClockTime *max_latency); GstClockTime gst_base_sink_get_latency (GstBaseSink *sink); G_END_DECLS #endif /* __GST_BASE_SINK_H__ */