/* GStreamer * Copyright (C) 1999,2000 Erik Walthinsen * 2000 Wim Taymans * 2005 Wim Taymans * * gstevent.h: Header for GstEvent subsystem * * 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_EVENT_H__ #define __GST_EVENT_H__ #include #include #include #include #include #include #include G_BEGIN_DECLS extern GType _gst_event_type; typedef struct _GstEvent GstEvent; #define GST_TYPE_EVENT (_gst_event_type) #define GST_IS_EVENT(obj) (GST_IS_MINI_OBJECT_TYPE (obj, GST_TYPE_EVENT)) #define GST_EVENT_CAST(obj) ((GstEvent *)(obj)) #define GST_EVENT(obj) (GST_EVENT_CAST(obj)) /** * GST_EVENT_TRACE_NAME: * * The name used for memory allocation tracing */ #define GST_EVENT_TRACE_NAME "GstEvent" /** * GstEventTypeFlags: * @GST_EVENT_TYPE_UPSTREAM: Set if the event can travel upstream. * @GST_EVENT_TYPE_DOWNSTREAM: Set if the event can travel downstream. * @GST_EVENT_TYPE_SERIALIZED: Set if the event should be serialized with data * flow. * @GST_EVENT_TYPE_STICKY: Set if the event is sticky on the pads. * * #GstEventTypeFlags indicate the aspects of the different #GstEventType * values. You can get the type flags of a #GstEventType with the * gst_event_type_get_flags() function. */ typedef enum { GST_EVENT_TYPE_UPSTREAM = 1 << 0, GST_EVENT_TYPE_DOWNSTREAM = 1 << 1, GST_EVENT_TYPE_SERIALIZED = 1 << 2, GST_EVENT_TYPE_STICKY = 1 << 3 } GstEventTypeFlags; /** * GST_EVENT_TYPE_BOTH: * * The same thing as #GST_EVENT_TYPE_UPSTREAM | #GST_EVENT_TYPE_DOWNSTREAM. */ #define GST_EVENT_TYPE_BOTH \ (GST_EVENT_TYPE_UPSTREAM | GST_EVENT_TYPE_DOWNSTREAM) #define GST_EVENT_MAX_STICKY 16 #define GST_EVENT_STICKY_SHIFT 8 #define GST_EVENT_NUM_SHIFT (GST_EVENT_STICKY_SHIFT + 4) /** * GST_EVENT_MAKE_TYPE: * @num: the event number to create * @idx: the index in the sticky array * @flags: the event flags * * when making custom event types, use this macro with the num and * the given flags */ #define GST_EVENT_MAKE_TYPE(num,idx,flags) \ (((num) << GST_EVENT_NUM_SHIFT) | ((idx) << GST_EVENT_STICKY_SHIFT) | (flags)) #define FLAG(name) GST_EVENT_TYPE_##name #define GST_EVENT_STICKY_IDX_TYPE(type) (((type) >> GST_EVENT_STICKY_SHIFT) & 0xf) #define GST_EVENT_STICKY_IDX(ev) GST_EVENT_STICKY_IDX_TYPE(GST_EVENT_TYPE(ev)) /** * GstEventType: * @GST_EVENT_UNKNOWN: unknown event. * @GST_EVENT_FLUSH_START: Start a flush operation. This event clears all data * from the pipeline and unblock all streaming threads. * @GST_EVENT_FLUSH_STOP: Stop a flush operation. This event resets the * running-time of the pipeline. * @GST_EVENT_EOS: End-Of-Stream. No more data is to be expected to follow * without a SEGMENT event. * @GST_EVENT_SEGMENT: A new media segment follows in the dataflow. The * segment events contains information for clipping buffers and * converting buffer timestamps to running-time and * stream-time. * @GST_EVENT_TAG: A new set of metadata tags has been found in the stream. * @GST_EVENT_BUFFERSIZE: Notification of buffering requirements. Currently not * used yet. * @GST_EVENT_SINK_MESSAGE: An event that sinks turn into a message. Used to * send messages that should be emitted in sync with * rendering. * Since: 0.10.26 * @GST_EVENT_QOS: A quality message. Used to indicate to upstream elements * that the downstream elements should adjust their processing * rate. * @GST_EVENT_SEEK: A request for a new playback position and rate. * @GST_EVENT_NAVIGATION: Navigation events are usually used for communicating * user requests, such as mouse or keyboard movements, * to upstream elements. * @GST_EVENT_LATENCY: Notification of new latency adjustment. Sinks will use * the latency information to adjust their synchronisation. * Since: 0.10.12 * @GST_EVENT_STEP: A request for stepping through the media. Sinks will usually * execute the step operation. Since: 0.10.24 * @GST_EVENT_RECONFIGURE: A request for upstream renegotiating caps and reconfiguring. * Since: 0.11.0 * @GST_EVENT_CUSTOM_UPSTREAM: Upstream custom event * @GST_EVENT_CUSTOM_DOWNSTREAM: Downstream custom event that travels in the * data flow. * @GST_EVENT_CUSTOM_DOWNSTREAM_OOB: Custom out-of-band downstream event. * @GST_EVENT_CUSTOM_BOTH: Custom upstream or downstream event. * In-band when travelling downstream. * @GST_EVENT_CUSTOM_BOTH_OOB: Custom upstream or downstream out-of-band event. * * #GstEventType lists the standard event types that can be sent in a pipeline. * * The custom event types can be used for private messages between elements * that can't be expressed using normal * GStreamer buffer passing semantics. Custom events carry an arbitrary * #GstStructure. * Specific custom events are distinguished by the name of the structure. */ /* NOTE: keep in sync with quark registration in gstevent.c */ typedef enum { GST_EVENT_UNKNOWN = GST_EVENT_MAKE_TYPE (0, 0, 0), /* bidirectional events */ GST_EVENT_FLUSH_START = GST_EVENT_MAKE_TYPE (1, 0, FLAG(BOTH)), GST_EVENT_FLUSH_STOP = GST_EVENT_MAKE_TYPE (2, 0, FLAG(BOTH) | FLAG(SERIALIZED)), /* downstream serialized events */ GST_EVENT_CAPS = GST_EVENT_MAKE_TYPE (5, 1, FLAG(DOWNSTREAM) | FLAG(SERIALIZED) | FLAG(STICKY)), GST_EVENT_SEGMENT = GST_EVENT_MAKE_TYPE (6, 2, FLAG(DOWNSTREAM) | FLAG(SERIALIZED) | FLAG(STICKY)), GST_EVENT_TAG = GST_EVENT_MAKE_TYPE (7, 3, FLAG(DOWNSTREAM) | FLAG(SERIALIZED) | FLAG(STICKY)), GST_EVENT_BUFFERSIZE = GST_EVENT_MAKE_TYPE (8, 4, FLAG(DOWNSTREAM) | FLAG(SERIALIZED) | FLAG(STICKY)), GST_EVENT_SINK_MESSAGE = GST_EVENT_MAKE_TYPE (9, 5, FLAG(DOWNSTREAM) | FLAG(SERIALIZED) | FLAG(STICKY)), GST_EVENT_EOS = GST_EVENT_MAKE_TYPE (10, 6, FLAG(DOWNSTREAM) | FLAG(SERIALIZED) | FLAG(STICKY)), /* upstream events */ GST_EVENT_QOS = GST_EVENT_MAKE_TYPE (15, 0, FLAG(UPSTREAM)), GST_EVENT_SEEK = GST_EVENT_MAKE_TYPE (16, 0, FLAG(UPSTREAM)), GST_EVENT_NAVIGATION = GST_EVENT_MAKE_TYPE (17, 0, FLAG(UPSTREAM)), GST_EVENT_LATENCY = GST_EVENT_MAKE_TYPE (18, 0, FLAG(UPSTREAM)), GST_EVENT_STEP = GST_EVENT_MAKE_TYPE (19, 0, FLAG(UPSTREAM)), GST_EVENT_RECONFIGURE = GST_EVENT_MAKE_TYPE (20, 0, FLAG(UPSTREAM)), /* custom events start here */ GST_EVENT_CUSTOM_UPSTREAM = GST_EVENT_MAKE_TYPE (32, 0, FLAG(UPSTREAM)), GST_EVENT_CUSTOM_DOWNSTREAM = GST_EVENT_MAKE_TYPE (32, 0, FLAG(DOWNSTREAM) | FLAG(SERIALIZED)), GST_EVENT_CUSTOM_DOWNSTREAM_OOB = GST_EVENT_MAKE_TYPE (32, 0, FLAG(DOWNSTREAM)), GST_EVENT_CUSTOM_BOTH = GST_EVENT_MAKE_TYPE (32, 0, FLAG(BOTH) | FLAG(SERIALIZED)), GST_EVENT_CUSTOM_BOTH_OOB = GST_EVENT_MAKE_TYPE (32, 0, FLAG(BOTH)) } GstEventType; #undef FLAG /** * GST_EVENT_TYPE: * @event: the event to query * * Get the #GstEventType of the event. */ #define GST_EVENT_TYPE(event) (GST_EVENT_CAST(event)->type) /** * GST_EVENT_TYPE_NAME: * @event: the event to query * * Get a constant string representation of the #GstEventType of the event. */ #define GST_EVENT_TYPE_NAME(event) (gst_event_type_get_name(GST_EVENT_TYPE(event))) /** * GST_EVENT_TIMESTAMP: * @event: the event to query * * Get the #GstClockTime timestamp of the event. This is the time when the event * was created. */ #define GST_EVENT_TIMESTAMP(event) (GST_EVENT_CAST(event)->timestamp) /** * GST_EVENT_SEQNUM: * @event: the event to query * * The sequence number of @event. */ #define GST_EVENT_SEQNUM(event) (GST_EVENT_CAST(event)->seqnum) /** * GST_EVENT_IS_UPSTREAM: * @ev: the event to query * * Check if an event can travel upstream. */ #define GST_EVENT_IS_UPSTREAM(ev) !!(GST_EVENT_TYPE (ev) & GST_EVENT_TYPE_UPSTREAM) /** * GST_EVENT_IS_DOWNSTREAM: * @ev: the event to query * * Check if an event can travel downstream. */ #define GST_EVENT_IS_DOWNSTREAM(ev) !!(GST_EVENT_TYPE (ev) & GST_EVENT_TYPE_DOWNSTREAM) /** * GST_EVENT_IS_SERIALIZED: * @ev: the event to query * * Check if an event is serialized with the data stream. */ #define GST_EVENT_IS_SERIALIZED(ev) !!(GST_EVENT_TYPE (ev) & GST_EVENT_TYPE_SERIALIZED) /** * GST_EVENT_IS_STICKY: * @ev: the event to query * * Check if an event is sticky on the pads. */ #define GST_EVENT_IS_STICKY(ev) !!(GST_EVENT_TYPE (ev) & GST_EVENT_TYPE_STICKY) /** * gst_event_is_writable: * @ev: a #GstEvent * * Tests if you can safely write data into a event's structure or validly * modify the seqnum and timestamp field. */ #define gst_event_is_writable(ev) gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (ev)) /** * gst_event_make_writable: * @ev: (transfer full): a #GstEvent * * Makes a writable event from the given event. If the source event is * already writable, this will simply return the same event. A copy will * otherwise be made using gst_event_copy(). * * Returns: (transfer full): a writable event which may or may not be the * same as @ev */ #define gst_event_make_writable(ev) GST_EVENT_CAST (gst_mini_object_make_writable (GST_MINI_OBJECT_CAST (ev))) /** * gst_event_replace: * @old_event: (inout) (transfer full): pointer to a pointer to a #GstEvent * to be replaced. * @new_event: (allow-none) (transfer none): pointer to a #GstEvent that will * replace the event pointed to by @old_event. * * Modifies a pointer to a #GstEvent to point to a different #GstEvent. The * modification is done atomically (so this is useful for ensuring thread safety * in some cases), and the reference counts are updated appropriately (the old * event is unreffed, the new one is reffed). * * Either @new_event or the #GstEvent pointed to by @old_event may be NULL. * * Since: 0.10.3 */ #define gst_event_replace(old_event,new_event) \ gst_mini_object_replace ((GstMiniObject **)(old_event), GST_MINI_OBJECT_CAST (new_event)) /** * GstQOSType: * @GST_QOS_TYPE_OVERFLOW: The QoS event type that is produced when downstream * elements are producing data too quickly and the element can't keep up * processing the data. Upstream should reduce their processing rate. This * type is also used when buffers arrive early or in time. * @GST_QOS_TYPE_UNDERFLOW: The QoS event type that is produced when downstream * elements are producing data too slowly and need to speed up their processing * rate. * @GST_QOS_TYPE_THROTTLE: The QoS event type that is produced when the * application enabled throttling to limit the datarate. * * The different types of QoS events that can be given to the * gst_event_new_qos() method. * * Since: 0.10.33 */ typedef enum { GST_QOS_TYPE_OVERFLOW = 0, GST_QOS_TYPE_UNDERFLOW = 1, GST_QOS_TYPE_THROTTLE = 2 } GstQOSType; /** * GstEvent: * @mini_object: the parent structure * @type: the #GstEventType of the event * @timestamp: the timestamp of the event * @structure: the #GstStructure containing the event info. * * A #GstEvent. */ struct _GstEvent { GstMiniObject mini_object; /*< public >*/ /* with COW */ GstEventType type; guint64 timestamp; guint32 seqnum; }; const gchar* gst_event_type_get_name (GstEventType type); GQuark gst_event_type_to_quark (GstEventType type); GstEventTypeFlags gst_event_type_get_flags (GstEventType type); /* refcounting */ /** * gst_event_ref: * @event: The event to refcount * * Increase the refcount of this event. * * Returns: (transfer full): @event (for convenience when doing assignments) */ #ifdef _FOOL_GTK_DOC_ G_INLINE_FUNC GstEvent * gst_event_ref (GstEvent * event); #endif static inline GstEvent * gst_event_ref (GstEvent * event) { return (GstEvent *) gst_mini_object_ref (GST_MINI_OBJECT_CAST (event)); } /** * gst_event_unref: * @event: (transfer full): the event to refcount * * Decrease the refcount of an event, freeing it if the refcount reaches 0. */ #ifdef _FOOL_GTK_DOC_ G_INLINE_FUNC void gst_event_unref (GstEvent * event); #endif static inline void gst_event_unref (GstEvent * event) { gst_mini_object_unref (GST_MINI_OBJECT_CAST (event)); } /* copy event */ /** * gst_event_copy: * @event: The event to copy * * Copy the event using the event specific copy function. * * Returns: (transfer full): the new event */ #ifdef _FOOL_GTK_DOC_ G_INLINE_FUNC GstEvent * gst_event_copy (const GstEvent * event); #endif static inline GstEvent * gst_event_copy (const GstEvent * event) { return GST_EVENT_CAST (gst_mini_object_copy (GST_MINI_OBJECT_CONST_CAST (event))); } /* custom event */ GstEvent* gst_event_new_custom (GstEventType type, GstStructure *structure); const GstStructure * gst_event_get_structure (GstEvent *event); GstStructure * gst_event_writable_structure (GstEvent *event); gboolean gst_event_has_name (GstEvent *event, const gchar *name); /* identifiers for events and messages */ guint32 gst_event_get_seqnum (GstEvent *event); void gst_event_set_seqnum (GstEvent *event, guint32 seqnum); /* flush events */ GstEvent * gst_event_new_flush_start (void); GstEvent * gst_event_new_flush_stop (void); /* EOS event */ GstEvent * gst_event_new_eos (void); /* Caps events */ GstEvent * gst_event_new_caps (GstCaps *caps); void gst_event_parse_caps (GstEvent *event, GstCaps **caps); /* segment event */ GstEvent* gst_event_new_segment (GstSegment *segment); void gst_event_parse_segment (GstEvent *event, const GstSegment **segment); void gst_event_copy_segment (GstEvent *event, GstSegment *segment); /* tag event */ GstEvent* gst_event_new_tag (GstTagList *taglist); void gst_event_parse_tag (GstEvent *event, GstTagList **taglist); /* buffer */ GstEvent * gst_event_new_buffer_size (GstFormat format, gint64 minsize, gint64 maxsize, gboolean async); void gst_event_parse_buffer_size (GstEvent *event, GstFormat *format, gint64 *minsize, gint64 *maxsize, gboolean *async); /* QOS events */ GstEvent* gst_event_new_qos (GstQOSType type, gdouble proportion, GstClockTimeDiff diff, GstClockTime timestamp); void gst_event_parse_qos (GstEvent *event, GstQOSType *type, gdouble *proportion, GstClockTimeDiff *diff, GstClockTime *timestamp); /* seek event */ GstEvent* gst_event_new_seek (gdouble rate, GstFormat format, GstSeekFlags flags, GstSeekType start_type, gint64 start, GstSeekType stop_type, gint64 stop); void gst_event_parse_seek (GstEvent *event, gdouble *rate, GstFormat *format, GstSeekFlags *flags, GstSeekType *start_type, gint64 *start, GstSeekType *stop_type, gint64 *stop); /* navigation event */ GstEvent* gst_event_new_navigation (GstStructure *structure); /* latency event */ GstEvent* gst_event_new_latency (GstClockTime latency); void gst_event_parse_latency (GstEvent *event, GstClockTime *latency); /* step event */ GstEvent* gst_event_new_step (GstFormat format, guint64 amount, gdouble rate, gboolean flush, gboolean intermediate); void gst_event_parse_step (GstEvent *event, GstFormat *format, guint64 *amount, gdouble *rate, gboolean *flush, gboolean *intermediate); /* renegotiate event */ GstEvent* gst_event_new_reconfigure (void); G_END_DECLS #endif /* __GST_EVENT_H__ */