QtFFPlay Class Reference

A class that handles the low-level SDL aspects of video playback. More...

#include <qtffplay.h>

Collaboration diagram for QtFFPlay:


Public Slots
QImage *	grabFrame ()
Public Member Functions
void	grabWindow ()
	If the video is to be played inside a window based on QT, this function will effectively "grab" that window and place the SDL overlay inside it.
Uint32	convert_yuv_rgb (Uint8 Y, Uint8 U, Uint8 V)
	Grabs a capture from the current stream.
	QtFFPlay (QWidget *parent=0, Qt::WFlags flags=0)
	The default constructor.
void	togglePause ()
	Toggles a pause of the currently playing stream (does not work currently).
int	init ()
	This MUST be called before a video stream is set up and run.
void	fill_rectangle (SDL_Surface *myscreen, int x, int y, int w, int h, int color)
void	blend_subrect (AVPicture dst, const AVSubtitleRect rect)
void	free_subpicture (SubPicture *sp)
void	video_image_display (VideoState *is)
int	compute_mod (int a, int b)
void	video_audio_display (VideoState *s)
void	video_display (VideoState *is)
void	schedule_refresh (VideoState *is, int delay)
void	stream_seek (VideoState *is, int64_t pos, int rel)
void	video_refresh_timer (void *opaque)
void	alloc_picture (void *opaque)
VideoState *	stream_open (QString filename, AVInputFormat iformat)
void	stream_close (VideoState *is)
void	stream_cycle_channel (VideoState *is, int codec_type)
void	toggle_full_screen (void)
void	toggle_pause (void)
void	step_to_next_frame (void)
void	do_exit (void)
void	toggle_audio_display (void)
void	opt_width (const char *arg)
void	opt_height (const char *arg)
void	opt_format (const char *arg)
void	opt_image_format (const char *arg)
void	opt_rtp_tcp (void)
void	opt_sync (const char *arg)
void	opt_seek (const char *arg)
void	opt_debug (const char *arg)
void	opt_vismv (const char *arg)
void	opt_thread_count (const char *arg)
void	show_help (void)
void	parse_arg_file (const char *filename)
Public Attributes
VideoState *	is
QString	input_filename
	A string holding the name of the input file.
Protected Member Functions
void	resizeEvent (QResizeEvent *)
void	paintEvent (QPaintEvent *)
Private Member Functions
void	save_pgm (unsigned char buf, int wrap, int xsize, int ysize, char filename)
	A small function to save a buffer to an image in the PGM file format.
Private Attributes
QLabel	myLabel
	A label that can be used for displaying a QPixmap.
Uint32 *	buffer_rgb
	The buffer that holds data converted from YUV to RGB.
int	buffer_init
	A flag that keeps track of whether the buffer was malloc'd.
QTimer *	mtimer
	A timer that can be set up to periodically grab frames, for instance.
int	flags
int	w
int	h
int	alreadyInit
SDL_Surface	tmpSurface
qtffthread	mythread
	The thread that does all the low-level work.

Detailed Description

A class that handles the low-level SDL aspects of video playback.

This class interfaces with the SDL and ffmpeg libraries for video playback.

This class has an instance of qtffthread which is derived from QThread, and runs separately to decode the video and copy frame information into a buffer. This class then uses that buffer information for frame grabbing.

Several of the member functions have no documentation; this is because they were derived from ffplay, which had no documentation. Sorry.

Definition at line 28 of file qtffplay.h.

Constructor & Destructor Documentation

QtFFPlay::QtFFPlay	(	QWidget *	parent = `0`,
		Qt::WFlags	flags = `0`
	)

The default constructor.

Parameters:

	parent	A pointer to the parent widget.
	flags	Flags that can be passed along to this widget related to QWidget properties.

Definition at line 13 of file qtffplay.cpp.

References alreadyInit, and buffer_init.

Member Function Documentation

Uint32 QtFFPlay::convert_yuv_rgb	(	Uint8	Y,
		Uint8	U,
		Uint8	V
	)

Grabs a capture from the current stream.

In order to display a grabbed frame, it must be converted from a standard video format (YUV) to RGB (red, green, blue). This function does just that and returns the pixel value in 32-bit ARGB format (where the Alpha value is not used).