GPAC A/V/2D/3D compositor/rendering. More...

Collaboration diagram for Compositor:

Enumerations
enum	GF_CompositorGrabMode { GF_SC_GRAB_DEPTH_NONE = 0 , GF_SC_GRAB_DEPTH_ONLY = 1 , GF_SC_GRAB_DEPTH_RGBD = 2 , GF_SC_GRAB_DEPTH_RGBDS = 3 }

enum	{ GF_ASPECT_RATIO_KEEP = 0 , GF_ASPECT_RATIO_16_9 , GF_ASPECT_RATIO_4_3 , GF_ASPECT_RATIO_FILL_SCREEN }

enum	{ GF_ANTIALIAS_NONE = 0 , GF_ANTIALIAS_TEXT , GF_ANTIALIAS_FULL }

enum	{ GF_STATE_PLAYING = 0 , GF_STATE_PAUSED , GF_STATE_STEP_PAUSE , GF_STATE_PLAY_LIVE = 10 }

enum	{ GF_INTERACT_NORMAL = 1 , GF_INTERACT_INPUT_SENSOR = 2 , GF_INTERACT_NAVIGATION = 4 }

enum	{ GF_BOUNDS_NONE = 0 , GF_BOUNDS_BOX , GF_BOUNDS_AABB }

enum	{ GF_WIREFRAME_NONE = 0 , GF_WIREFRAME_ONLY , GF_WIREFRAME_SOLID }

enum	{ GF_NAVIGATE_TYPE_NONE , GF_NAVIGATE_TYPE_2D , GF_NAVIGATE_TYPE_3D }

enum	{ GF_NAVIGATE_NONE = 0 , GF_NAVIGATE_WALK , GF_NAVIGATE_FLY , GF_NAVIGATE_PAN , GF_NAVIGATE_GAME , GF_NAVIGATE_SLIDE , GF_NAVIGATE_EXAMINE , GF_NAVIGATE_ORBIT , GF_NAVIGATE_VR }

enum	{ GF_COLLISION_NONE , GF_COLLISION_NORMAL , GF_COLLISION_DISPLACEMENT }

enum	{ GF_TEXTURE_TEXT_DEFAULT = 0 , GF_TEXTURE_TEXT_NEVER , GF_TEXTURE_TEXT_ALWAYS }

enum	{ GF_NORMALS_NONE = 0 , GF_NORMALS_FACE , GF_NORMALS_VERTEX }

enum	{ GF_BACK_CULL_OFF = 0 , GF_BACK_CULL_ON , GF_BACK_CULL_ALPHA }

enum	{ GF_DRAW_MODE_DEFER =0 , GF_DRAW_MODE_IMMEDIATE , GF_DRAW_MODE_DEFER_DEBUG }

enum	GF_CompositorOption { GF_OPT_ANTIALIAS =0 , GF_OPT_HIGHSPEED , GF_OPT_FULLSCREEN , GF_OPT_ORIGINAL_VIEW , GF_OPT_OVERRIDE_SIZE , GF_OPT_AUDIO_VOLUME , GF_OPT_AUDIO_PAN , GF_OPT_AUDIO_MUTE , GF_OPT_HAS_JAVASCRIPT , GF_OPT_CAN_SELECT_STREAMS , GF_OPT_INTERACTION_LEVEL , GF_OPT_VISIBLE , GF_OPT_FREEZE_DISPLAY , GF_OPT_IS_FINISHED , GF_OPT_IS_OVER , GF_OPT_ASPECT_RATIO , GF_OPT_REFRESH , GF_OPT_STRESS_MODE , GF_OPT_DRAW_BOUNDS , GF_OPT_TEXTURE_TEXT , GF_OPT_RELOAD_CONFIG , GF_OPT_NAVIGATION_TYPE , GF_OPT_NAVIGATION , GF_OPT_PLAY_STATE , GF_OPT_MAIN_ADDON , GF_OPT_VIDEO_BENCH , GF_OPT_USE_OPENGL , GF_OPT_DRAW_MODE , GF_OPT_SCALABLE_ZOOM , GF_OPT_YUV_HARDWARE , GF_OPT_YUV_FORMAT , GF_OPT_VIDEO_CACHE_SIZE , GF_OPT_HTTP_MAX_RATE , GF_OPT_FORCE_AUDIO_CONFIG , GF_OPT_RASTER_OUTLINES , GF_OPT_EMULATE_POW2 , GF_OPT_POLYGON_ANTIALIAS , GF_OPT_WIREFRAME , GF_OPT_NORMALS , GF_OPT_BACK_CULL , GF_OPT_NO_RECT_TEXTURE , GF_OPT_HEADLIGHT , GF_OPT_COLLISION , GF_OPT_GRAVITY , GF_OPT_NUM_STEREO_VIEWS , GF_OPT_MULTIVIEW_MODE , GF_OPT_ORIENTATION_SENSORS_ACTIVE }

Functions
GF_Err	gf_sc_load (GF_Compositor *compositor)

void	gf_sc_unload (GF_Compositor *compositor)

void	gf_sc_set_fps (GF_Compositor *compositor, GF_Fraction fps)

GF_Err	gf_sc_set_scene (GF_Compositor compositor, GF_SceneGraph scene_graph)

Bool	gf_sc_draw_frame (GF_Compositor compositor, Bool no_video_flush, s32 ms_till_next)

void	gf_sc_invalidate (GF_Compositor compositor, GF_Node node)

void	gf_sc_invalidate_next_frame (GF_Compositor *compositor)

Bool	gf_sc_frame_was_produced (GF_Compositor *compositor)

u32	gf_sc_get_clock (GF_Compositor *compositor)

void	gf_sc_node_destroy (GF_Compositor compositor, GF_Node node, GF_SceneGraph *sg)

void	gf_sc_lock (GF_Compositor *compositor, Bool do_lock)

Bool	gf_sc_user_event (GF_Compositor compositor, GF_Event event)

void	gf_sc_disconnect (GF_Compositor *compositor)

void	gf_sc_connect_from_time (GF_Compositor compositor, const char URL, u64 startTime, u32 pause_at_first_frame, Bool secondary_scene, const char *parent_path)

void	gf_sc_map_point (GF_Compositor compositor, s32 X, s32 Y, Fixed bifsX, Fixed *bifsY)

Double	gf_sc_get_fps (GF_Compositor *compositor, Bool absoluteFPS)

Bool	gf_sc_has_text_selection (GF_Compositor *compositor)

const char *	gf_sc_get_selected_text (GF_Compositor *compositor)

GF_Err	gf_sc_paste_text (GF_Compositor compositor, const char text)

GF_Err	gf_sc_add_object (GF_Compositor compositor, const char url, Bool auto_play)

GF_Err	gf_sc_get_screen_buffer (GF_Compositor compositor, GF_VideoSurface framebuffer, GF_CompositorGrabMode depth_grab_mode)

GF_Err	gf_sc_get_offscreen_buffer (GF_Compositor compositor, GF_VideoSurface framebuffer, u32 view_idx, GF_CompositorGrabMode depth_grab_mode)

GF_Err	gf_sc_release_screen_buffer (GF_Compositor compositor, GF_VideoSurface framebuffer)

void	gf_sc_reset_graphics (GF_Compositor *compositor)

GF_Err	gf_sc_get_viewpoint (GF_Compositor compositor, u32 viewpoint_idx, const char out_name, Bool is_bound)

GF_Err	gf_sc_set_viewpoint (GF_Compositor compositor, u32 viewpoint_idx, const char viewpoint_name)

void	gf_sc_traverse_subscene (GF_Compositor compositor, GF_Node inline_parent, GF_SceneGraph subscene, void rs)

GF_Err	gf_sc_set_size (GF_Compositor *compositor, u32 new_width, u32 new_height)

void	gf_sc_register_extra_graph (GF_Compositor compositor, GF_SceneGraph extra_scene, Bool do_remove)

GF_Compositor *	gf_sc_get_compositor (GF_Node *node)

Bool	gf_sc_script_action (GF_Compositor compositor, GF_JSAPIActionType type, GF_Node node, GF_JSAPIParam *param)

Bool	gf_sc_uri_is_hardcoded_proto (GF_Compositor compositor, const char uri)

void	gf_sc_reload_config (GF_Compositor *compositor)

u32	gf_sc_get_time_in_ms (GF_Compositor *compositor)

void	gf_sc_switch_quality (GF_Compositor *compositor, Bool up)

void	gf_sc_toggle_addons (GF_Compositor *compositor, Bool show_addons)

GF_Err	gf_sc_set_speed (GF_Compositor *compositor, Fixed speed)

Bool	gf_sc_is_supported_url (GF_Compositor compositor, const char URL, Bool use_parent_url)

void	gf_sc_navigate_to (GF_Compositor compositor, const char toURL)

u32	gf_sc_play_from_time (GF_Compositor *compositor, u64 from_time, u32 pause_at_first_frame)

GF_Err	gf_sc_dump_scene (GF_Compositor compositor, char rad_name, char **filename, Bool xml_dump, Bool skip_proto)

GF_Err	gf_sc_scene_update (GF_Compositor compositor, char type, char *com)

void	gf_sc_select_service (GF_Compositor *compositor, u32 service_id)

const char *	gf_sc_get_url (GF_Compositor *compositor)

const void *	gf_sc_get_main_pid (GF_Compositor *compositor)

const char *	gf_sc_get_world_info (GF_Compositor compositor, GF_List descriptions)

u32	gf_sc_get_current_service_id (GF_Compositor *compositor)

Double	gf_sc_get_simulation_frame_rate (GF_Compositor compositor, u32 nb_frames_drawn)

GF_Err	gf_sc_set_option (GF_Compositor *compositor, GF_CompositorOption type, u32 value)

u32	gf_sc_get_option (GF_Compositor *compositor, GF_CompositorOption type)

Detailed Description

This section documents the compositor of GPAC in charge of assembling audio, images, video, text, 2D and 3D graphics in a timed fashion. The compositor can only be run as a filter starting from GPAC 0.9.0, as it requires the filters API to fetch media data. The compositor can work in real-time mode (player) or as a regular filter. See gpac -h compositorfor more information.

The compositor object is the private data of the compositor filter and can be retrieved using gf_filter_get_udta

The compositor object will look for the following variables in the temp section of the GPAC config:

window-flags: output window initialization flags - see GF_VideoOutputWindowFlags
window-handle: OS-specific window handle (HWND on windows,
window-display

Enumeration Type Documentation

◆ GF_CompositorGrabMode

enum GF_CompositorGrabMode

compositor screen buffer grab mode

Enumerator
GF_SC_GRAB_DEPTH_NONE	grab color only
GF_SC_GRAB_DEPTH_ONLY	grab depth only
GF_SC_GRAB_DEPTH_RGBD	grab RGB+depth
GF_SC_GRAB_DEPTH_RGBDS	grab RGB+depth (7 bits) + 1 bit shape from alpha

◆ anonymous enum

anonymous enum

AspectRatio Type

Enumerator
GF_ASPECT_RATIO_KEEP	keep AR
GF_ASPECT_RATIO_16_9	keep 16/9
GF_ASPECT_RATIO_4_3	keep 4/3
GF_ASPECT_RATIO_FILL_SCREEN	none (all rendering area used)

◆ anonymous enum

anonymous enum

AntiAlias settings

Enumerator
GF_ANTIALIAS_NONE	no antialiasing
GF_ANTIALIAS_TEXT	only text has antialiasing
GF_ANTIALIAS_FULL	full antialiasing

◆ anonymous enum

anonymous enum

PlayState settings

Enumerator
GF_STATE_PLAYING	compositor is playing (get only)
GF_STATE_PAUSED	compositor is paused (get only)
GF_STATE_STEP_PAUSE	On set, compositor will pause after next frame (simulation tick). On get, indicates that rendering step hasn't performed yet
GF_STATE_PLAY_LIVE	indicates resume shall restart from live point if any rather than pause point (set only)

◆ anonymous enum

anonymous enum

interaction level settings

Note: GF_INTERACT_NORMAL and GF_INTERACT_NAVIGATION filter events. If set, any event processed by these 2 modules won't be forwarded to the user

Enumerator
GF_INTERACT_NORMAL	regular interactions enabled (touch sensors)
GF_INTERACT_INPUT_SENSOR	InputSensor interactions enabled (mouse and keyboard)
GF_INTERACT_NAVIGATION	all navigation interactions enabled (mouse and keyboard)

◆ anonymous enum

anonymous enum

BoundingVolume settings

Enumerator
GF_BOUNDS_NONE	doesn't draw bounding volume
GF_BOUNDS_BOX	draw object bounding box / rect
GF_BOUNDS_AABB	draw object AABB tree (3D only)

◆ anonymous enum

anonymous enum

Wireframe settings

Enumerator
GF_WIREFRAME_NONE	draw solid volumes
GF_WIREFRAME_ONLY	draw only wireframe
GF_WIREFRAME_SOLID	draw wireframe on solid object

◆ anonymous enum

anonymous enum

navigation type

Enumerator
GF_NAVIGATE_TYPE_NONE	navigation is disabled by content and cannot be forced by user
GF_NAVIGATE_TYPE_2D	2D navigation modes only can be used
GF_NAVIGATE_TYPE_3D	3D navigation modes only can be used

◆ anonymous enum

anonymous enum

navigation modes - non-VRML ones are simply blaxxun contact ones

Enumerator
GF_NAVIGATE_NONE	no navigation
GF_NAVIGATE_WALK	3D navigation modes walk navigation
GF_NAVIGATE_FLY	fly navigation
GF_NAVIGATE_PAN	pan navigation
GF_NAVIGATE_GAME	game navigation
GF_NAVIGATE_SLIDE	slide navigation, for 2D and 3D
GF_NAVIGATE_EXAMINE	all modes below disable collision detection & gravity in 3D
GF_NAVIGATE_ORBIT	orbit navigation - 3D only
GF_NAVIGATE_VR	QT-VR like navigation - 3D only

◆ anonymous enum

anonymous enum

collision flags

Enumerator
GF_COLLISION_NONE	no collision
GF_COLLISION_NORMAL	regular collision
GF_COLLISION_DISPLACEMENT	collision with camera displacement

◆ anonymous enum

anonymous enum

TextTexturing settings

Enumerator
GF_TEXTURE_TEXT_DEFAULT	text drawn as texture in 3D mode, regular in 2D mode
GF_TEXTURE_TEXT_NEVER	text never drawn as texture
GF_TEXTURE_TEXT_ALWAYS	text always drawn

◆ anonymous enum

anonymous enum

Normal drawing settings

Enumerator
GF_NORMALS_NONE	normals never drawn
GF_NORMALS_FACE	normals drawn per face (at barycenter)
GF_NORMALS_VERTEX	normals drawn per vertex

◆ anonymous enum

anonymous enum

Back-face culling mode

Enumerator
GF_BACK_CULL_OFF	backface culling disabled
GF_BACK_CULL_ON	backface culliong enabled
GF_BACK_CULL_ALPHA	backface culling enabled also for transparent meshes

◆ anonymous enum

anonymous enum

2D drawing mode

Enumerator
GF_DRAW_MODE_DEFER	defer draw mode (only modified parts of the canvas are drawn)
GF_DRAW_MODE_IMMEDIATE	immediate draw mode (canvas always redrawn)
GF_DRAW_MODE_DEFER_DEBUG	defer debug draw mode (only modified parts of the canvas are drawn, the rest of the canvas is erased)

◆ GF_CompositorOption

enum GF_CompositorOption

compositor options

Enumerator
GF_OPT_ANTIALIAS	set/get antialias flag (value: one of the AntiAlias enum) - may be ignored in OpenGL mode depending on graphic cards
GF_OPT_HIGHSPEED	set/get fast mode (value: boolean)
GF_OPT_FULLSCREEN	set/get fullscreen flag (value: boolean)
GF_OPT_ORIGINAL_VIEW	reset top-level transform to original (value: boolean)
GF_OPT_OVERRIDE_SIZE	overrides BIFS size info for simple AV - this is not recommended since it will resize the window to the size of the biggest texture (thus some elements may be lost)
GF_OPT_AUDIO_VOLUME	set / get audio volume (value is intensity between 0 and 100)
GF_OPT_AUDIO_PAN	set / get audio pan (value is pan between 0 (all left) and 100(all right) )
GF_OPT_AUDIO_MUTE	set / get audio mute
GF_OPT_HAS_JAVASCRIPT	get javascript flag (no set, depends on compil) - value: boolean, true if JS enabled in build
GF_OPT_CAN_SELECT_STREAMS	get selectable stream flag (no set) - value: boolean, true if audio/video/subtitle stream selection is possible with content (if an MPEG-4 scene description is not present). Use regular OD browsing to get streams
GF_OPT_INTERACTION_LEVEL	set/get control interaction, OR'ed combination of interaction flags
GF_OPT_VISIBLE	set display window visible / get show/hide state
GF_OPT_FREEZE_DISPLAY	set freeze display on/off / get freeze state freeze_display prevents any screen updates needed when output driver uses direct video memory access
GF_OPT_IS_FINISHED	Returns 1 if file playback is considered as done (all streams finished, no active time sensors and no user interactions in the scene)
GF_OPT_IS_OVER	Returns 1 if file timeline is considered as done (all streams finished, no active time sensors)
GF_OPT_ASPECT_RATIO	set/get aspect ratio (value: one of AspectRatio enum)
GF_OPT_REFRESH	send a redraw message (SetOption only): all graphics info (display list, vectorial path) is recomputed, and textures are reloaded in HW
GF_OPT_STRESS_MODE	set/get stress mode (value: boolean) - in stress mode a GF_OPT_FORCE_REDRAW is emulated at each frame
GF_OPT_DRAW_BOUNDS	get/set bounding volume drawing (value: one of the above option)
GF_OPT_TEXTURE_TEXT	get/set texture text option - when enabled and usable (that depends on content), text is first rendered to a texture and only the texture is drawn, rather than drawing all the text each time (CPU intensive)
GF_OPT_RELOAD_CONFIG	reload config file (set only), including drivers. Plugins configs are not reloaded
GF_OPT_NAVIGATION_TYPE	get: returns whether the content enable navigation and if it's 2D or 3D. set: reset viewpoint (whatever value is given)
GF_OPT_NAVIGATION	get current navigation mode - set navigation mode if allowed by content - this is not a resident option (eg not stored in cfg)
GF_OPT_PLAY_STATE	get/set Play state - cf above states for set
GF_OPT_MAIN_ADDON	get only: returns 1 if main addon is playing, 0 if regular scene is playing
GF_OPT_VIDEO_BENCH	get/set bench mode - if enabled, video frames are drawn as soon as possible witthout checking synchronisation
GF_OPT_USE_OPENGL	get/set OpenGL force mode - returns error if OpenGL is not supported
GF_OPT_DRAW_MODE	set/get draw mode
GF_OPT_SCALABLE_ZOOM	set/get scalable zoom (value: boolean)
GF_OPT_YUV_HARDWARE	set/get YUV acceleration (value: boolean)
GF_OPT_YUV_FORMAT	get (set not supported yet) hardware YUV format (value: YUV 4CC)
GF_OPT_VIDEO_CACHE_SIZE	max video cache size in kbytes
GF_OPT_HTTP_MAX_RATE	max HTTP download rate in bits per second, 0 if no limit
GF_OPT_FORCE_AUDIO_CONFIG	set only (value: boolean). If set, the main audio mixer can no longer be reconfigured.
GF_OPT_RASTER_OUTLINES	3D ONLY OPTIONS set/get raster outline flag (value: boolean) - when set, no vectorial outlining is done, only OpenGL raster outline
GF_OPT_EMULATE_POW2	set/get pow2 emulation flag (value: boolean) - when set, video textures with non power of 2 dimensions are emulated as pow2 by expanding the video buffer (image is not scaled). Otherwise the entire image is rescaled. This flag does not affect image textures, which are always rescaled
GF_OPT_POLYGON_ANTIALIAS	get/set polygon antialiasing flag (value: boolean) (may be ugly with some cards)
GF_OPT_WIREFRAME	get/set wireframe flag (value: cf above) (may be ugly with some cards)
GF_OPT_NORMALS	get/set wireframe flag (value: cf above) (may be ugly with some cards)
GF_OPT_BACK_CULL	disable backface culling
GF_OPT_NO_RECT_TEXTURE	get/set RECT Ext flag (value: boolean) - when set, GL rectangular texture extension is not used (but NPO2 texturing is if available)
GF_OPT_HEADLIGHT	set/get headlight (value: boolean)
GF_OPT_COLLISION	set/get collision (value: cf above)
GF_OPT_GRAVITY	set/get gravity
GF_OPT_NUM_STEREO_VIEWS	get the number of offscreen views in stereo mode, or 1 if no offscreen stereo views are available
GF_OPT_MULTIVIEW_MODE	set the mode of display of HEVC multiview videos, 0 to display the two views/layers and 1 to display just the first view/layer
GF_OPT_ORIENTATION_SENSORS_ACTIVE	get orientation sensors flag, true if sensors are activated false if not

Function Documentation

◆ gf_sc_load()

GF_Err gf_sc_load ( GF_Compositor * compositor )

loads a compositor object

Parameters

compositor a preallocated structure for the compositor to initialize

Returns: error if any

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◆ gf_sc_unload()

void gf_sc_unload ( GF_Compositor * compositor )

unloads compositor

Parameters

compositor the compositor object to unload. The structure memory is not freed

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◆ gf_sc_set_fps()

void gf_sc_set_fps	(	GF_Compositor *	compositor,
		GF_Fraction	fps
	)

sets simulation frame rate. The compositor framerate impacts the frequency at which time nodes and animations are updated, but does not impact the video objects frame rates.

Parameters

compositor	the target compositor
fps	the desired frame rate

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◆ gf_sc_set_scene()

GF_Err gf_sc_set_scene	(	GF_Compositor *	compositor,
		GF_SceneGraph *	scene_graph
	)

sets the root scene graph of the compositor.

Parameters

compositor	the target compositor
scene_graph	the scene graph to attach. If NULL, removes current scene and resets simulation time

Returns: error if any

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◆ gf_sc_draw_frame()

Bool gf_sc_draw_frame	(	GF_Compositor *	compositor,
		Bool	no_video_flush,
		s32 *	ms_till_next
	)

draws a single frame. If the frame is drawn, a packet is sent on the compositor vout output pi

Parameters

compositor	the target compositor
no_video_flush	disables video frame flushing to graphics card. Ignored in non-player mode
ms_till_next	set to the number of milliseconds until next expected frame

Returns: GF_TRUE if there are pending tasks (frame late, fonts pending, etc) or GF_FALSE if everything was ready while drawing the frame

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◆ gf_sc_invalidate()

void gf_sc_invalidate	(	GF_Compositor *	compositor,
		GF_Node *	node
	)

notify the given node has been modified. The compositor filters object to decide whether the scene graph has to be traversed or not.

Parameters

compositor	the target compositor
node	the node to invalidate. If NULL, this means complete traversing of the graph is requested

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◆ gf_sc_invalidate_next_frame()

void gf_sc_invalidate_next_frame ( GF_Compositor * compositor )

mark next frame as required to be refreshed

Parameters

compositor the target compositor

◆ gf_sc_frame_was_produced()

Bool gf_sc_frame_was_produced ( GF_Compositor * compositor )

checks if a frame has been produced since last call to gf_sc_invalidate_next_frame. This is typically used when the caller app has no control over flush

Parameters

compositor the target compositor

Returns: GF_TRUE if frame was produced , GF_FALSE otherwise

◆ gf_sc_get_clock()

u32 gf_sc_get_clock ( GF_Compositor * compositor )

returns the compositor time. The compositor time is the time every time line is synchronized to

Parameters

compositor the target compositor

Returns: compositor time in milliseconds

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◆ gf_sc_node_destroy()

void gf_sc_node_destroy	(	GF_Compositor *	compositor,
		GF_Node *	node,
		GF_SceneGraph *	sg
	)

signals the node or scenegraph is about to be destroyed. This should be called after the node destructor if any. This function cleans up any pending events on the target node or graph.

Parameters

compositor	the target compositor
node	the target node. If NULL, sg shall be set to the scenegraph about to be destroyed
sg	the target scenegraph

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◆ gf_sc_lock()

void gf_sc_lock	(	GF_Compositor *	compositor,
		Bool	do_lock
	)

locks/unlocks the visual scene rendering. Modifications of the scene tree shall only happen when scene compositor is locked

Parameters

compositor	the target compositor
do_lock	indicates if the compositor should be locked (GF_TRUE) or released (GF_FALSE)

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◆ gf_sc_user_event()

Bool gf_sc_user_event	(	GF_Compositor *	compositor,
		GF_Event *	event
	)

notify user input

Parameters

compositor	the target compositor
event	the target event to notify

Returns: GF_FALSE if event hasn't been handled by the compositor, GF_TRUE otherwise

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◆ gf_sc_disconnect()

void gf_sc_disconnect ( GF_Compositor * compositor )

disconnects the current url

Parameters

compositor the target compositor

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◆ gf_sc_connect_from_time()

void gf_sc_connect_from_time	(	GF_Compositor *	compositor,
		const char *	URL,
		u64	startTime,
		u32	pause_at_first_frame,
		Bool	secondary_scene,
		const char *	parent_path
	)

connects a given url

Parameters

compositor	the target compositor
URL	the target URL
startTime	start time in milliseconds
pause_at_first_frame	indicate if compositor should pause once first frame is reached If 1, pauses at the first frame If 2, pauses at the first frame only if the compositor is in paused state otherwise do not pause
secondary_scene	indicate this is a secondary scene (subs, etc)
parent_path	parent path of URL, may be NULL

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◆ gf_sc_map_point()

void gf_sc_map_point	(	GF_Compositor *	compositor,
		s32	X,
		s32	Y,
		Fixed *	bifsX,
		Fixed *	bifsY
	)

maps screen coordinates to bifs 2D coordinates for the current zoom/pan settings. The input coordinate X and Y are point coordinates in the display expressed in BIFS-like fashion (0,0) at center of display and Y increasing from bottom to top

Parameters

compositor	the target compositor
X	horizontal point coordinate
Y	vertical point coordinate
bifsX	set to the scene horizontal coordinate of the point
bifsY	set to the scene vertical coordinate of the point

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◆ gf_sc_get_fps()

Double gf_sc_get_fps	(	GF_Compositor *	compositor,
		Bool	absoluteFPS
	)

returns current FPS

Parameters

compositor	the target compositor
absoluteFPS	if set to GF_TRUE, the return value is the absolute framerate, eg NbFrameCount/NbTimeSpent regardless of whether a frame has been drawn or not, which means the FPS returned can be much greater than the compositor FPS. If set to GF_FALSE, the return value is the FPS taking into account not drawn frames (eg, less than or equal to compositor FPS)

Returns: the current frame rate

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◆ gf_sc_has_text_selection()

Bool gf_sc_has_text_selection ( GF_Compositor * compositor )

checks if a text selection is in progress

Parameters

compositor the target compositor

Returns: GF_TRUE is some text is selected, GF_FALSE otherwise

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◆ gf_sc_get_selected_text()

const char* gf_sc_get_selected_text ( GF_Compositor * compositor )

gets text selection

Parameters

compositor the target compositor

Returns: the selected text as UTF8 string

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◆ gf_sc_paste_text()

GF_Err gf_sc_paste_text	(	GF_Compositor *	compositor,
		const char *	text
	)

replace text selection content

Parameters

compositor	the target compositor
text	the text to paste as UTF8 string

Returns: error if any

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◆ gf_sc_add_object()

GF_Err gf_sc_add_object	(	GF_Compositor *	compositor,
		const char *	url,
		Bool	auto_play
	)

adds an object to the scene - only possible if scene has selectable streams (cf GF_OPT_CAN_SELECT_STREAMS option)

Parameters

compositor	the target compositor
url	the URL of the object to inject
auto_play	selcts the object for playback when inserting it

Returns: error if any

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◆ gf_sc_get_screen_buffer()

GF_Err gf_sc_get_screen_buffer	(	GF_Compositor *	compositor,
		GF_VideoSurface *	framebuffer,
		GF_CompositorGrabMode	depth_grab_mode
	)

gets screen buffer. This locks the scene graph too until gf_sc_get_offscreen_buffer is called

Parameters

compositor	the target compositor
framebuffer	will be set to the grabbed framebuffer. The pixel data is owned by the compositor and shall not be freed
depth_grab_mode	mode for depth grabbing in 3D

Returns: error if any

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◆ gf_sc_get_offscreen_buffer()

GF_Err gf_sc_get_offscreen_buffer	(	GF_Compositor *	compositor,
		GF_VideoSurface *	framebuffer,
		u32	view_idx,
		GF_CompositorGrabMode	depth_grab_mode
	)

gets offscreen buffer in autostereo rendering modes. This locks the scene graph too until gf_sc_get_offscreen_buffer is called

Parameters

compositor	the target compositor
framebuffer	will be set to the grabbed framebuffer. The pixel data is owned by the compositor and shall not be freed
view_idx	indicates the 0-based index of the view to grab
depth_grab_mode	mode for depth grabbing in 3D

Returns: error if any

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◆ gf_sc_release_screen_buffer()

GF_Err gf_sc_release_screen_buffer	(	GF_Compositor *	compositor,
		GF_VideoSurface *	framebuffer
	)

releases screen buffer and unlocks graph

Parameters

compositor	the target compositor
framebuffer	used during grab call

Returns: error if any

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◆ gf_sc_reset_graphics()

void gf_sc_reset_graphics ( GF_Compositor * compositor )

forces full graphics reset (deletes GL textures, FBO, 2D offscreen caches, etc ...).

Parameters

compositor the target compositor

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◆ gf_sc_get_viewpoint()

GF_Err gf_sc_get_viewpoint	(	GF_Compositor *	compositor,
		u32	viewpoint_idx,
		const char **	out_name,
		Bool *	is_bound
	)

gets viewpoints/viewports for main scene - idx is 1-based, and if greater than number of viewpoints return GF_EOS

Parameters

compositor	the target compositor
viewpoint_idx	the index of the requested viewport. This is a 1-based index, and if greater than number of viewpoints the function will return GF_EOS
out_name	set to the viewport name. May be NULL
is_bound	set to GF_TRUE if the viewport is bound. May be NULL

Returns: GF_EOS if no more viewpoint, or error if any

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◆ gf_sc_set_viewpoint()

GF_Err gf_sc_set_viewpoint	(	GF_Compositor *	compositor,
		u32	viewpoint_idx,
		const char *	viewpoint_name
	)

sets viewpoints/viewports for main scene given its name - idx is 1-based, or 0 to retrieve by viewpoint name if only one viewpoint is present in the scene, this will bind/unbind it

Parameters

compositor	the target compositor
viewpoint_idx	the index of the viewport to bind. This is a 1-based index, and if greater than number of viewpoints the function will return GF_EOS. Use 0 to bind the viewpoint with the given name.
viewpoint_name	name of the viewpoint to bind if viewpoint_idx is 0

Returns: error if any

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◆ gf_sc_traverse_subscene()

void gf_sc_traverse_subscene	(	GF_Compositor *	compositor,
		GF_Node *	inline_parent,
		GF_SceneGraph *	subscene,
		void *	rs
	)

renders subscene root node. rs is the current traverse stack

Parameters

compositor	the target compositor
inline_parent	the parent node of the subscene (VRML Inline, SVG animation, ...)
subscene	the subscene tree to render
rs	the rendering state at the parent level. This is needed to handle graph metrics changes between scenes

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◆ gf_sc_set_size()

GF_Err gf_sc_set_size	(	GF_Compositor *	compositor,
		u32	new_width,
		u32	new_height
	)

sets output (display) size

Parameters

compositor	the target compositor
new_width	the desired new output width
new_height	the desired new output height

Returns: error if any

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◆ gf_sc_register_extra_graph()

void gf_sc_register_extra_graph	(	GF_Compositor *	compositor,
		GF_SceneGraph *	extra_scene,
		Bool	do_remove
	)

adds or removes extra scene from compositor. Extra scenes are on-screen displays, text tracks or any other scene graphs not directly loaded by the main scene

Parameters

compositor	the target compositor
extra_scene	the scene graph to add/remove
do_remove	if set to GF_TRUE, the given scene graph will be unregistered; otherwise, the given scene graph will be registered

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◆ gf_sc_get_compositor()

GF_Compositor* gf_sc_get_compositor ( GF_Node * node )

retrieves the compositor object associated with a node. Currently GPAC only handles one possible compositor per node.

Parameters

node	the target node

Returns: the compositor used by the node

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◆ gf_sc_script_action()

Bool gf_sc_script_action	(	GF_Compositor *	compositor,
		GF_JSAPIActionType	type,
		GF_Node *	node,
		GF_JSAPIParam *	param
	)

executes a script action

Parameters

compositor	the target compositor
type	the script action type
node	the optional node on which the action takes place
param	the parameter for this action

Returns: GF_TRUE if success

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◆ gf_sc_uri_is_hardcoded_proto()

Bool gf_sc_uri_is_hardcoded_proto	(	GF_Compositor *	compositor,
		const char *	uri
	)

checks if the given URI matches a built-in GPAC VRML Prototype node

Parameters

compositor	the target compositor
uri	the URI to test

Returns: GF_TRUE if the URI indicates a built-in prototype, GF_FALSE otherwise

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◆ gf_sc_reload_config()

void gf_sc_reload_config ( GF_Compositor * compositor )

reloads the compositor configuration from the GPAC config file

Parameters

compositor the target compositor

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◆ gf_sc_get_time_in_ms()

u32 gf_sc_get_time_in_ms ( GF_Compositor * compositor )

gets main scene current time

Parameters

compositor the target compositor

Returns: time in milliseconds

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◆ gf_sc_switch_quality()

void gf_sc_switch_quality	(	GF_Compositor *	compositor,
		Bool	up
	)

switches quality up or down - can be called several time in the same direction this will call all decoders to adjust their quality levels

Parameters

compositor	the target compositor
up	if GF_TRUE, switches quality up,otherwise down

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◆ gf_sc_toggle_addons()

void gf_sc_toggle_addons	(	GF_Compositor *	compositor,
		Bool	show_addons
	)

sets addon on or off (only one addon possible for now). When OFF, the associated service is shut down

Parameters

compositor	the target compositor
show_addons	if GF_TRUE, displays addons otheriwse hides the addons

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◆ gf_sc_set_speed()

GF_Err gf_sc_set_speed	(	GF_Compositor *	compositor,
		Fixed	speed
	)

sets playback speed

Parameters

compositor	the target compositor
speed	the requested speed

Returns: error if any

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◆ gf_sc_is_supported_url()

Bool gf_sc_is_supported_url	(	GF_Compositor *	compositor,
		const char *	URL,
		Bool	use_parent_url
	)

checks if given URL is understood by client.

Parameters

compositor	the target compositor
URL	the URL to check
use_parent_url	if GF_TRUE, relative URLs are solved against the current presentation URL

Returns: GF_TRUE if client should be able to handle the URL

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◆ gf_sc_navigate_to()

void gf_sc_navigate_to	(	GF_Compositor *	compositor,
		const char *	toURL
	)

navigates to a given destination or shutdown/restart the current one if any. This is the only safe way of restarting/jumping a presentation from inside the EventProc where doing a disconnect/connect could deadlock if toURL is NULL, uses the current URL

Parameters

compositor	the target compositor
toURL	the new target URL

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◆ gf_sc_play_from_time()

u32 gf_sc_play_from_time	(	GF_Compositor *	compositor,
		u64	from_time,
		u32	pause_at_first_frame
	)

restarts url from given time (in ms).

Parameters

compositor	the target compositor
from_time	restart time in milliseconds
pause_at_first_frame	if 1, pauses at the first frame. If 2, pauses at the first frame only if the compositor is in paused state.

Returns: 0: service is not connected yet, 1: service has no seeking capabilities, 2: service has been seeked

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◆ gf_sc_dump_scene()

GF_Err gf_sc_dump_scene	(	GF_Compositor *	compositor,
		char *	rad_name,
		char **	filename,
		Bool	xml_dump,
		Bool	skip_proto
	)

dumps scene graph in specified file, in BT or XMT format

Parameters

compositor	the target compositor
rad_name	file radical (NULL for stdout) - if not NULL MUST BE GF_MAX_PATH length
filename	sets to the complete filename (rad + ext) and shall be destroyed by caller (optional can be NULL)
xml_dump	if GF_TRUE, duimps using XML format (XMT-A, X3D) for scene graphs having both XML and simple text representations
skip_proto	is GF_TRUE, proto declarations are not dumped

Returns: error if any

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◆ gf_sc_scene_update()

GF_Err gf_sc_scene_update	(	GF_Compositor *	compositor,
		char *	type,
		char *	com
	)

sends a set of scene commands (BT, XMT, X3D, LASeR+XML) to the scene

Parameters

compositor	the target compositor
type	indicates the language used - accepted values are "model/x3d+xml" or "x3d": commands is an X3D+XML scene "model/x3d+vrml" or "xrdv": commands is an X3D+VRML scene "model/vrml" or "vrml": commands is an VRML scene "application/x-xmt" or "xmt": commands is an XMT-A scene or a list of XMT-A updates "application/x-bt" or "bt": commands is a BT scene or a list of BT updates "image/svg+xml" or "svg": commands is an SVG scene "application/x-laser+xml" or "laser": commands is an SVG/LASeR+XML scene or a list of LASeR+XML updates if not specified, the type will be guessed from the current root node if any
com	the textual update

Returns: error if any

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◆ gf_sc_select_service()

void gf_sc_select_service	(	GF_Compositor *	compositor,
		u32	service_id
	)

selects service by given ID for multiplexed services (MPEG-2 TS)

Parameters

compositor	the target compositor
service_id	the service ID to select

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◆ gf_sc_get_url()

const char* gf_sc_get_url ( GF_Compositor * compositor )

gets URL of main scene

Parameters

compositor the target compositor

Returns: URL

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◆ gf_sc_get_main_pid()

const void* gf_sc_get_main_pid ( GF_Compositor * compositor )

gets main pid in scene

Parameters

compositor the target compositor

Returns: PID

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◆ gf_sc_get_world_info()

const char* gf_sc_get_world_info	(	GF_Compositor *	compositor,
		GF_List *	descriptions
	)

gets world info of root scene

Parameters

compositor	the target compositor
descriptions	filled with descriptions strings (do not free)

Returns: world title or NULL if no world info

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◆ gf_sc_get_current_service_id()

u32 gf_sc_get_current_service_id ( GF_Compositor * compositor )

gets service ID of root scene

Parameters

compositor the target compositor

Returns: service ID or 0 if none speicifed (single service in URL)

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◆ gf_sc_get_simulation_frame_rate()

Double gf_sc_get_simulation_frame_rate	(	GF_Compositor *	compositor,
		u32 *	nb_frames_drawn
	)

gets simulation frame rate

Parameters

compositor	the target compositor
nb_frames_drawn	set to the number of frames drawn

Returns: simulation frames per seconds

◆ gf_sc_set_option()

GF_Err gf_sc_set_option	(	GF_Compositor *	compositor,
		GF_CompositorOption	type,
		u32	value
	)

sets compositor run-time option

Parameters

compositor	the target compositor
type	the target option type
value	the target option value

Returns: error if any

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◆ gf_sc_get_option()

u32 gf_sc_get_option	(	GF_Compositor *	compositor,
		GF_CompositorOption	type
	)

gets compositor run-time option.

Parameters

compositor	the target compositor
type	the target option type

Returns: the option value

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Enumerations

Functions

Detailed Description

Enumeration Type Documentation

◆ GF_CompositorGrabMode

◆ anonymous enum

◆ anonymous enum

◆ anonymous enum

◆ anonymous enum

◆ anonymous enum

◆ anonymous enum

◆ anonymous enum

◆ anonymous enum

◆ anonymous enum

◆ anonymous enum

◆ anonymous enum

◆ anonymous enum

◆ anonymous enum

◆ GF_CompositorOption

Function Documentation

◆ gf_sc_load()

◆ gf_sc_unload()

◆ gf_sc_set_fps()

◆ gf_sc_set_scene()

◆ gf_sc_draw_frame()

◆ gf_sc_invalidate()

◆ gf_sc_invalidate_next_frame()

◆ gf_sc_frame_was_produced()

◆ gf_sc_get_clock()

◆ gf_sc_node_destroy()

◆ gf_sc_lock()

◆ gf_sc_user_event()

◆ gf_sc_disconnect()

◆ gf_sc_connect_from_time()

◆ gf_sc_map_point()

◆ gf_sc_get_fps()

◆ gf_sc_has_text_selection()

◆ gf_sc_get_selected_text()

◆ gf_sc_paste_text()

◆ gf_sc_add_object()

◆ gf_sc_get_screen_buffer()

◆ gf_sc_get_offscreen_buffer()

◆ gf_sc_release_screen_buffer()

◆ gf_sc_reset_graphics()

◆ gf_sc_get_viewpoint()

◆ gf_sc_set_viewpoint()

◆ gf_sc_traverse_subscene()

◆ gf_sc_set_size()

◆ gf_sc_register_extra_graph()

◆ gf_sc_get_compositor()

◆ gf_sc_script_action()

◆ gf_sc_uri_is_hardcoded_proto()

◆ gf_sc_reload_config()

◆ gf_sc_get_time_in_ms()

◆ gf_sc_switch_quality()

◆ gf_sc_toggle_addons()

◆ gf_sc_set_speed()

◆ gf_sc_is_supported_url()

◆ gf_sc_navigate_to()

◆ gf_sc_play_from_time()

◆ gf_sc_dump_scene()

◆ gf_sc_scene_update()

◆ gf_sc_select_service()

◆ gf_sc_get_url()

◆ gf_sc_get_main_pid()

◆ gf_sc_get_world_info()

◆ gf_sc_get_current_service_id()

◆ gf_sc_get_simulation_frame_rate()

◆ gf_sc_set_option()

◆ gf_sc_get_option()