OutputTinyGPU Class Reference

Bridges VideoDecoder's write() calls to a TinyGPU ILI9341Driver - VideoDecoder always hands over one complete frame per write() call (see its class comment), so this can push the whole frame in one go. Usually the data is in RGB565 format, but other formats are supported as well. More...

#include <OutputTinyGPU.h>

Inheritance diagram for OutputTinyGPU:

Public Member Functions
	OutputTinyGPU (ILI9341Driver< RGB565 > &driver, int width, int height, int pinBacklight, int bandHeight=40)
bool	begin ()
void	clearScreen ()
virtual void	flush ()
void	setVideoInfo (VideoInfo info)
	Defines the video format and dimensions - call before begin() if you.
void	setVideoInfoSource (VideoInfoSource &source)
	Defines the source of the video information (width, height, fps, format)
size_t	write (const uint8_t *data, size_t len) override

Protected Attributes
int	height = 240
VideoInfo	info_
int	kBandHeight
int	kPinBacklight
VideoInfoSource *	p_info = nullptr
ILI9341Driver< RGB565 > &	tftDriver
int	width = 320

Detailed Description

Bridges VideoDecoder's write() calls to a TinyGPU ILI9341Driver - VideoDecoder always hands over one complete frame per write() call (see its class comment), so this can push the whole frame in one go. Usually the data is in RGB565 format, but other formats are supported as well.

write() never allocates or copies a full-frame buffer of its own: it wraps the caller's already-decoded frame in a SurfaceWithExternalBuffer (a TinyGPU view over externally-owned memory) and hands that straight to the display driver, so RAM use stays independent of the frame size - only clearScreen()'s small band buffer (kBandHeight rows) is actually owned/allocated here.

Author

Phil Schatzmann

Copyright

GPLv3

Constructor & Destructor Documentation

OutputTinyGPU()

OutputTinyGPU ( ILI9341Driver< RGB565 > &  driver, int  width, int  height, int  pinBacklight, int  bandHeight = 40  )

inline

Parameters

bandHeight

height (in pixels) of the strip used to clear the screen in begin() - kept small (default 40) so the clear buffer stays a small, single allocation instead of a full-screen framebuffer; see TinyGPU's bouncing-ball example for the same technique.

Member Function Documentation

begin()

bool begin ( )

inline

clearScreen()

void clearScreen ( )

inline

flush()

virtual void flush ( )

inlinevirtualinherited

Finalizes the frame most recently written via one or more write() calls - see class comment. Default no-op for implementations that display/decode synchronously in write() instead.

Reimplemented in Muxer, H264Decoder, H264DecoderESP32S3< Alloc >, MJPEGDecoder, MPGDecoder, and OutputOpenCV.

setVideoInfo()

void setVideoInfo ( VideoInfo  info )

inline

Defines the video format and dimensions - call before begin() if you.

setVideoInfoSource()

void setVideoInfoSource ( VideoInfoSource &  source )

inline

Defines the source of the video information (width, height, fps, format)

write()

size_t write ( const uint8_t *  data, size_t  len  )

inlineoverridevirtual

Implements VideoOutput.

Member Data Documentation

height

int height = 240

protected

info_

VideoInfo info_

protected

kBandHeight

int kBandHeight

protected

kPinBacklight

int kPinBacklight

protected

p_info

VideoInfoSource* p_info = nullptr

protected

tftDriver

ILI9341Driver<RGB565>& tftDriver

protected

width

int width = 320

protected

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The documentation for this class was generated from the following file:

• src/AudioTools/Video/OutputTinyGPU.h