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332 lines
11 KiB
C
332 lines
11 KiB
C
/* GStreamer
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* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
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* Library <2002> Ronald Bultje <rbultje@ronald.bitfreak.net>
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* Copyright (C) 2007 David A. Schleef <ds@schleef.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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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "video-event.h"
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#define GST_VIDEO_EVENT_STILL_STATE_NAME "GstEventStillFrame"
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/**
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* gst_video_event_new_still_frame:
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* @in_still: boolean value for the still-frame state of the event.
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*
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* Creates a new Still Frame event. If @in_still is %TRUE, then the event
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* represents the start of a still frame sequence. If it is %FALSE, then
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* the event ends a still frame sequence.
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*
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* To parse an event created by gst_video_event_new_still_frame() use
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* gst_video_event_parse_still_frame().
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*
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* Returns: The new GstEvent
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*/
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GstEvent *
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gst_video_event_new_still_frame (gboolean in_still)
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{
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GstEvent *still_event;
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GstStructure *s;
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s = gst_structure_new (GST_VIDEO_EVENT_STILL_STATE_NAME,
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"still-state", G_TYPE_BOOLEAN, in_still, NULL);
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still_event = gst_event_new_custom (GST_EVENT_CUSTOM_DOWNSTREAM, s);
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return still_event;
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}
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/**
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* gst_video_event_parse_still_frame:
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* @event: A #GstEvent to parse
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* @in_still: (out):
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* A boolean to receive the still-frame status from the event, or NULL
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*
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* Parse a #GstEvent, identify if it is a Still Frame event, and
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* return the still-frame state from the event if it is.
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* If the event represents the start of a still frame, the in_still
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* variable will be set to TRUE, otherwise FALSE. It is OK to pass NULL for the
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* in_still variable order to just check whether the event is a valid still-frame
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* event.
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*
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* Create a still frame event using gst_video_event_new_still_frame()
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*
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* Returns: %TRUE if the event is a valid still-frame event. %FALSE if not
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*/
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gboolean
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gst_video_event_parse_still_frame (GstEvent * event, gboolean * in_still)
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{
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const GstStructure *s;
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gboolean ev_still_state;
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g_return_val_if_fail (event != NULL, FALSE);
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if (GST_EVENT_TYPE (event) != GST_EVENT_CUSTOM_DOWNSTREAM)
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return FALSE; /* Not a still frame event */
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s = gst_event_get_structure (event);
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if (s == NULL
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|| !gst_structure_has_name (s, GST_VIDEO_EVENT_STILL_STATE_NAME))
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return FALSE; /* Not a still frame event */
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if (!gst_structure_get_boolean (s, "still-state", &ev_still_state))
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return FALSE; /* Not a still frame event */
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if (in_still)
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*in_still = ev_still_state;
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return TRUE;
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}
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#define GST_VIDEO_EVENT_FORCE_KEY_UNIT_NAME "GstForceKeyUnit"
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/**
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* gst_video_event_new_downstream_force_key_unit:
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* @timestamp: the timestamp of the buffer that starts a new key unit
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* @stream_time: the stream_time of the buffer that starts a new key unit
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* @running_time: the running_time of the buffer that starts a new key unit
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* @all_headers: %TRUE to produce headers when starting a new key unit
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* @count: integer that can be used to number key units
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*
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* Creates a new downstream force key unit event. A downstream force key unit
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* event can be sent down the pipeline to request downstream elements to produce
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* a key unit. A downstream force key unit event must also be sent when handling
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* an upstream force key unit event to notify downstream that the latter has been
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* handled.
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*
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* To parse an event created by gst_video_event_new_downstream_force_key_unit() use
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* gst_video_event_parse_downstream_force_key_unit().
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*
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* Returns: The new GstEvent
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*/
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GstEvent *
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gst_video_event_new_downstream_force_key_unit (GstClockTime timestamp,
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GstClockTime stream_time, GstClockTime running_time, gboolean all_headers,
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guint count)
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{
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GstEvent *force_key_unit_event;
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GstStructure *s;
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s = gst_structure_new (GST_VIDEO_EVENT_FORCE_KEY_UNIT_NAME,
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"timestamp", G_TYPE_UINT64, timestamp,
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"stream-time", G_TYPE_UINT64, stream_time,
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"running-time", G_TYPE_UINT64, running_time,
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"all-headers", G_TYPE_BOOLEAN, all_headers,
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"count", G_TYPE_UINT, count, NULL);
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force_key_unit_event = gst_event_new_custom (GST_EVENT_CUSTOM_DOWNSTREAM, s);
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return force_key_unit_event;
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}
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/**
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* gst_video_event_new_upstream_force_key_unit:
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* @running_time: the running_time at which a new key unit should be produced
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* @all_headers: %TRUE to produce headers when starting a new key unit
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* @count: integer that can be used to number key units
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*
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* Creates a new upstream force key unit event. An upstream force key unit event
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* can be sent to request upstream elements to produce a key unit.
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*
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* @running_time can be set to request a new key unit at a specific
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* running_time. If set to GST_CLOCK_TIME_NONE, upstream elements will produce a
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* new key unit as soon as possible.
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*
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* To parse an event created by gst_video_event_new_downstream_force_key_unit() use
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* gst_video_event_parse_downstream_force_key_unit().
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*
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* Returns: The new GstEvent
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*/
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GstEvent *
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gst_video_event_new_upstream_force_key_unit (GstClockTime running_time,
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gboolean all_headers, guint count)
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{
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GstEvent *force_key_unit_event;
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GstStructure *s;
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s = gst_structure_new (GST_VIDEO_EVENT_FORCE_KEY_UNIT_NAME,
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"running-time", GST_TYPE_CLOCK_TIME, running_time,
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"all-headers", G_TYPE_BOOLEAN, all_headers,
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"count", G_TYPE_UINT, count, NULL);
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force_key_unit_event = gst_event_new_custom (GST_EVENT_CUSTOM_UPSTREAM, s);
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return force_key_unit_event;
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}
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/**
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* gst_video_event_is_force_key_unit:
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* @event: A #GstEvent to check
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*
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* Checks if an event is a force key unit event. Returns true for both upstream
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* and downstream force key unit events.
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*
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* Returns: %TRUE if the event is a valid force key unit event
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*/
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gboolean
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gst_video_event_is_force_key_unit (GstEvent * event)
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{
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const GstStructure *s;
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g_return_val_if_fail (event != NULL, FALSE);
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if (GST_EVENT_TYPE (event) != GST_EVENT_CUSTOM_DOWNSTREAM &&
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GST_EVENT_TYPE (event) != GST_EVENT_CUSTOM_UPSTREAM)
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return FALSE; /* Not a force key unit event */
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s = gst_event_get_structure (event);
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if (s == NULL
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|| !gst_structure_has_name (s, GST_VIDEO_EVENT_FORCE_KEY_UNIT_NAME))
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return FALSE;
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return TRUE;
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}
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/**
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* gst_video_event_parse_downstream_force_key_unit:
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* @event: A #GstEvent to parse
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* @timestamp: (out): A pointer to the timestamp in the event
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* @stream_time: (out): A pointer to the stream-time in the event
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* @running_time: (out): A pointer to the running-time in the event
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* @all_headers: (out): A pointer to the all_headers flag in the event
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* @count: (out): A pointer to the count field of the event
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*
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* Get timestamp, stream-time, running-time, all-headers and count in the force
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* key unit event. See gst_video_event_new_downstream_force_key_unit() for a
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* full description of the downstream force key unit event.
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*
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* @running_time will be adjusted for any pad offsets of pads it was passing through.
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*
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* Returns: %TRUE if the event is a valid downstream force key unit event.
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*/
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gboolean
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gst_video_event_parse_downstream_force_key_unit (GstEvent * event,
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GstClockTime * timestamp, GstClockTime * stream_time,
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GstClockTime * running_time, gboolean * all_headers, guint * count)
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{
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const GstStructure *s;
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GstClockTime ev_timestamp, ev_stream_time, ev_running_time;
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gboolean ev_all_headers;
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guint ev_count;
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g_return_val_if_fail (event != NULL, FALSE);
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if (GST_EVENT_TYPE (event) != GST_EVENT_CUSTOM_DOWNSTREAM)
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return FALSE; /* Not a force key unit event */
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s = gst_event_get_structure (event);
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if (s == NULL
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|| !gst_structure_has_name (s, GST_VIDEO_EVENT_FORCE_KEY_UNIT_NAME))
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return FALSE;
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if (!gst_structure_get_clock_time (s, "timestamp", &ev_timestamp))
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ev_timestamp = GST_CLOCK_TIME_NONE;
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if (!gst_structure_get_clock_time (s, "stream-time", &ev_stream_time))
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ev_stream_time = GST_CLOCK_TIME_NONE;
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if (!gst_structure_get_clock_time (s, "running-time", &ev_running_time))
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ev_running_time = GST_CLOCK_TIME_NONE;
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if (!gst_structure_get_boolean (s, "all-headers", &ev_all_headers))
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ev_all_headers = FALSE;
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if (!gst_structure_get_uint (s, "count", &ev_count))
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ev_count = 0;
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if (timestamp)
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*timestamp = ev_timestamp;
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if (stream_time)
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*stream_time = ev_stream_time;
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if (running_time) {
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gint64 offset = gst_event_get_running_time_offset (event);
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*running_time = ev_running_time;
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/* Catch underflows */
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if (*running_time > -offset)
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*running_time += offset;
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else
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*running_time = 0;
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}
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if (all_headers)
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*all_headers = ev_all_headers;
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if (count)
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*count = ev_count;
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return TRUE;
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}
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/**
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* gst_video_event_parse_upstream_force_key_unit:
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* @event: A #GstEvent to parse
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* @running_time: (out): A pointer to the running_time in the event
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* @all_headers: (out): A pointer to the all_headers flag in the event
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* @count: (out): A pointer to the count field in the event
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*
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* Get running-time, all-headers and count in the force key unit event. See
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* gst_video_event_new_upstream_force_key_unit() for a full description of the
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* upstream force key unit event.
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*
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* Create an upstream force key unit event using gst_video_event_new_upstream_force_key_unit()
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*
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* @running_time will be adjusted for any pad offsets of pads it was passing through.
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*
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* Returns: %TRUE if the event is a valid upstream force-key-unit event. %FALSE if not
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*/
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gboolean
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gst_video_event_parse_upstream_force_key_unit (GstEvent * event,
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GstClockTime * running_time, gboolean * all_headers, guint * count)
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{
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const GstStructure *s;
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GstClockTime ev_running_time;
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gboolean ev_all_headers;
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guint ev_count;
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g_return_val_if_fail (event != NULL, FALSE);
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if (GST_EVENT_TYPE (event) != GST_EVENT_CUSTOM_UPSTREAM)
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return FALSE; /* Not a force key unit event */
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s = gst_event_get_structure (event);
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if (s == NULL
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|| !gst_structure_has_name (s, GST_VIDEO_EVENT_FORCE_KEY_UNIT_NAME))
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return FALSE;
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if (!gst_structure_get_clock_time (s, "running-time", &ev_running_time))
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ev_running_time = GST_CLOCK_TIME_NONE;
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if (!gst_structure_get_boolean (s, "all-headers", &ev_all_headers))
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ev_all_headers = FALSE;
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if (!gst_structure_get_uint (s, "count", &ev_count))
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ev_count = 0;
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if (running_time) {
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gint64 offset = gst_event_get_running_time_offset (event);
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*running_time = ev_running_time;
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/* Catch underflows */
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if (*running_time > -offset)
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*running_time += offset;
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else
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*running_time = 0;
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}
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if (all_headers)
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*all_headers = ev_all_headers;
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if (count)
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*count = ev_count;
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return TRUE;
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}
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