#include <videoplayer.h>

Public Member Functions
	VideoPlayer (VideoService &service)

const VideoFile &	getFile () const

const Video &	getVideo () const

Video &	getVideo ()

int	getIndex () const

int	getCount () const

bool	selectVideo (int index, utility::ErrorState &error)

void	play (double startTime=0.0)

void	stopPlayback ()

bool	isPlaying () const

void	loop (bool value)

bool	isLooping () const

void	setSpeed (float speed)

float	getSpeed () const

void	seek (double seconds)

double	getCurrentTime () const

double	getDuration () const

int	getWidth () const

int	getHeight () const

bool	hasAudio () const

virtual bool	start (utility::ErrorState &errorState) override

virtual void	stop () override

bool	hasSelection () const

Texture2D &	getYTexture ()

Texture2D &	getUTexture ()

Texture2D &	getVTexture ()

Public Member Functions inherited from Resource
	Resource ()

Public Member Functions inherited from Object
	Object ()

virtual	~Object ()

virtual bool	init (utility::ErrorState &errorState)

virtual void	onDestroy ()

	Object (Object &)=delete

Object &	operator= (const Object &)=delete

	Object (Object &&)=delete

Object &	operator= (Object &&)=delete

Public Attributes
std::vector< nap::ResourcePtr< VideoFile > >	mVideoFiles
	Property: 'Files' All video file links. More...

nap::uint	mVideoIndex = 0
	Property: 'Index' Selected video index. More...

bool	mLoop = false
	Property: 'Loop' if the selected video loops. More...

float	mSpeed = 1.0f
	Property: 'Speed' video playback speed. More...

nap::Signal< nap::VideoPlayer & >	VideoChanged

Public Attributes inherited from Object
std::string	mID
	Property: 'mID' unique name of the object. Used as an identifier by the system. More...

Additional Inherited Members
Static Public Member Functions inherited from Object
static bool	isIDProperty (rtti::Instance &object, const rtti::Property &property)

Description

Video playback device.

Decodes a video, from a list of videos, in a background thread and stores the result in a set of YUV textures. The textures are filled with the latest frame data on update(), which is a non-blocking operation. The nap::VideoService calls update() automatically each frame.

The main thread will consume the frames when they are present in the frame queue and their timestamp has 'passed'. Internally the textures are only updated when needed. YUV to RGB Conversion can be done in a shader.

Videos are cached internally. This means that all videos in the playlist are created on start(), including the associated video format and video codec contexts. This ensures that a video can be started and stopped fast, without having to re-open a video when switching. The IO and decode threads are spawned on play() and stopped on stopPlayback().

Note that the YUV textures are (re)-created when the video dimensions change from selection to selection. This is done to ensure there is always only 1 set of YUV textures allocated on the GPU per video player instance, instead of a set of textures per video. A valid set of textures is always available after a successful call to selectVideo() Listen to the VideoChanged signal to get notified about a video change.

Every video must contain a video stream, the audio stream is optional. Use a nap::VideoAudioComponent to decode and play back the audio of a video. Without a nap::VideoAudioComponent no audio is decoded and therefore played back.

Do not call start() and stop() at runtime, unless you want to completely restart the device and free all memory, start() and stop() are called automatically by the engine at the appropiate time. Use play() and stopPlayback() instead to start and stop playback of the currently selected video. You always have to call play() after selecting a different video:

utility::ErrorState error;
if (!mVideoPlayer->selectVideo(new_selection, error))
   nap::Logger::error(error.toString());
else
   mVideoPlayer->play();

Inheritance diagram for VideoPlayer:

[legend]

Collaboration diagram for VideoPlayer:

[legend]

Constructor & Destructor Documentation

◆ VideoPlayer()

VideoPlayer ( VideoService & service )

Member Function Documentation

◆ getCount()

int getCount ( ) const

Returns: total number of available videos to choose from

◆ getCurrentTime()

double getCurrentTime ( ) const

Returns: The current playback position in seconds.

◆ getDuration()

double getDuration ( ) const

Returns: The duration of the video in seconds.

◆ getFile()

const VideoFile& getFile ( ) const

Returns: currently selected video file.

◆ getHeight()

int getHeight ( ) const

Returns: Height of the video, in pixels.

◆ getIndex()

int getIndex ( ) const

Returns: selected video index

◆ getSpeed()

float getSpeed ( ) const

Returns: current video playback speed

◆ getUTexture()

Texture2D& getUTexture ( )

Returns the decoded video U texture. The texture is not initialized to zero, but to the 'black' equivalent in YUV space. The size of the U texture is HALF the width * height.

Returns: The video Y texture.

◆ getVideo() [1/2]

Video& getVideo ( )

Returns: selected video context

◆ getVideo() [2/2]

const Video& getVideo ( ) const

Returns: selected video context

◆ getVTexture()

Texture2D& getVTexture ( )

Returns the decoded video V texture. The texture is not initialized to zero, but to the 'black' equivalent in YUV space. The size of the V texture is HALF the width * height.

Returns: The video V texture.

◆ getWidth()

int getWidth ( ) const

Returns: Width of the video, in pixels.

◆ getYTexture()

Texture2D& getYTexture ( )

Returns the decoded video Y texture. The texture is not initialized to zero, but to the 'black' equivalent in YUV space. The size of the Y texture is width * height.

Returns: The video Y texture.

◆ hasAudio()

bool hasAudio ( ) const

Returns: Whether this video has an audio stream.

◆ hasSelection()

bool hasSelection ( ) const

Returns: if there is a video selected.

◆ isLooping()

bool isLooping ( ) const

Returns: if the current video is looping

◆ isPlaying()

bool isPlaying ( ) const

Check if the currently loaded video is playing.

Returns: If the video is currently playing.

◆ loop()

void loop ( bool value )

If the video re-starts after completion.

Parameters

value if the video re-starts after completion.

◆ play()

void play ( double startTime = 0.0 )

Starts playback of the current video at the given offset in seconds.

Parameters

startTime The offset in seconds to start the video at.

◆ seek()

void seek ( double seconds )

Seeks within the video to the time provided. This can be called while playing.

Parameters

seconds the time offset in seconds in the video.

◆ selectVideo()

bool selectVideo	(	int	index,
		utility::ErrorState &	error
	)

Loads a new video to play, returns false if selection fails. The 'VideoChanged' signal is emitted on success. Call play() afterwards to start playback of the video.

utility::ErrorState error;
if (!mVideoPlayer->selectVideo(new_selection, error))
   nap::Logger::error(error.toString());
else
   mVideoPlayer->play();

A new set of YUV textures is generated IF the new video has different dimensions or is the first to be selected. The old set of textures will be destroyed immediately and will be invalid after this call.

Parameters

index	index of the video to load.
error	contains the error if changing the video fails.

Returns: if video selection succeeded or failed

◆ setSpeed()

void setSpeed ( float speed )

Changes the playback speed of the player.

Parameters

speed new playback speed, 1.0f = default speed.

◆ start()

virtual bool start ( utility::ErrorState & errorState )

overridevirtual

Starts the device.

Parameters

errorState contains the error if the device can't be started

Returns: if the device started

Reimplemented from Device.

◆ stop()

virtual void stop ( )

overridevirtual

Stops the device

Reimplemented from Device.

◆ stopPlayback()

void stopPlayback ( )

Stops playback of the current video.

Member Data Documentation

◆ mLoop

bool mLoop = false

Property: 'Loop' if the selected video loops.

◆ mSpeed

float mSpeed = 1.0f

Property: 'Speed' video playback speed.

◆ mVideoFiles

std::vector<nap::ResourcePtr<VideoFile> > mVideoFiles

Property: 'Files' All video file links.

◆ mVideoIndex

nap::uint mVideoIndex = 0

Property: 'Index' Selected video index.

◆ VideoChanged

nap::Signal<nap::VideoPlayer&> VideoChanged

Emitted after a successful video switch.

Public Member Functions

Public Attributes

Additional Inherited Members

Description

Constructor & Destructor Documentation

◆ VideoPlayer()

Member Function Documentation

◆ getCount()

◆ getCurrentTime()

◆ getDuration()

◆ getFile()

◆ getHeight()

◆ getIndex()

◆ getSpeed()

◆ getUTexture()

◆ getVideo() [1/2]

◆ getVideo() [2/2]

◆ getVTexture()

◆ getWidth()

◆ getYTexture()

◆ hasAudio()

◆ hasSelection()

◆ isLooping()

◆ isPlaying()

◆ loop()

◆ play()

◆ seek()

◆ selectVideo()

◆ setSpeed()

◆ start()

◆ stop()

◆ stopPlayback()

Member Data Documentation

◆ mLoop

◆ mSpeed

◆ mVideoFiles

◆ mVideoIndex

◆ VideoChanged