QVideoEncoder Class Reference

Video encoder based on FFmpeg. More...

#include <QVideoEncoder.h>

Collaboration diagram for QVideoEncoder:

Classes
struct	OutputFormat
	Output format. More...

Public Member Functions
	QVideoEncoder (QString filename, int width, int height, unsigned bitrate, int gop=12, int fps=25)
	Default constructor. More...
virtual	~QVideoEncoder ()
bool	open (QString formatShortName, QStringList &errors)
	Creates an (empty) video/anmiation file. More...
bool	isOpen () const
	Returns whether the file is opened or not. More...
virtual bool	encodeImage (const QImage &image, int frameIndex, QString *errorString=nullptr)
	Adds an image to the stream. More...
virtual bool	close ()
	Closes the file. More...

Static Public Member Functions
static bool	GetSupportedOutputFormats (std::vector< OutputFormat > &formats, bool ignoreIfNoFileExtension=true)
	Returns the list of supported output formats. More...

Protected Member Functions
bool	isSizeValid ()
	Returns whether the image size is valid. More...
bool	initFrame ()
void	freeFrame ()
bool	convertImage_sws (const QImage &image, QString *errorString=nullptr)
	Convert the QImage to the internal YUV format. More...

Protected Attributes
QString	m_filename
int	m_width
int	m_height
unsigned	m_bitrate
int	m_gop
int	m_fps
bool	m_isOpen
FFmpegStuffEnc *	m_ff
	FFmpeg variables. More...

Detailed Description

Video encoder based on FFmpeg.

Definition at line 14 of file QVideoEncoder.h.

Constructor & Destructor Documentation

QVideoEncoder()

QVideoEncoder::QVideoEncoder	(	QString	filename,
		int	width,
		int	height,
		unsigned	bitrate,
		int	gop = 12,
		int	fps = 25
	)

Default constructor.

Parameters

filename	video filename
width	video width (must be a multiple of 8)
height	video height (must be a multiple of 8)
bitrate	bit rate (e.g. 400 000)
gop	keyframe interval
fps	frame rate

Definition at line 47 of file QVideoEncoder.cpp.

~QVideoEncoder()

QVideoEncoder::~QVideoEncoder ( )

virtual

Definition at line 62 of file QVideoEncoder.cpp.

References close(), and m_ff.

Member Function Documentation

close()

bool QVideoEncoder::close ( )

virtual

Closes the file.

Definition at line 330 of file QVideoEncoder.cpp.

References FFmpegStuffEnc::codecContext, FFmpegStuffEnc::formatContext, freeFrame(), m_ff, m_isOpen, and write_frame().

Referenced by ~QVideoEncoder().

convertImage_sws()

bool QVideoEncoder::convertImage_sws ( const QImage &  image, QString *  errorString = nullptr  )

protected

Convert the QImage to the internal YUV format.

Warning

The QImage is allocated by QT without guarantee about the alignment and bytes per lines. It should be okay as we make sure the image size is a multiple of 8 bytes however it is not guaranteed that sws_scale won't at some point require more bytes per line.

Definition at line 492 of file QVideoEncoder.cpp.

References format, FFmpegStuffEnc::frame, image, m_ff, m_height, m_width, and FFmpegStuffEnc::swsContext.

Referenced by encodeImage().

encodeImage()

bool QVideoEncoder::encodeImage ( const QImage &  image, int  frameIndex, QString *  errorString = nullptr  )

virtual

Adds an image to the stream.

Definition at line 394 of file QVideoEncoder.cpp.

References FFmpegStuffEnc::codecContext, convertImage_sws(), FFmpegStuffEnc::frame, image, isOpen(), m_ff, and write_frame().

freeFrame()

void QVideoEncoder::freeFrame ( )

protected

Definition at line 98 of file QVideoEncoder.cpp.

References FFmpegStuffEnc::frame, and m_ff.

Referenced by close().

GetSupportedOutputFormats()

bool QVideoEncoder::GetSupportedOutputFormats ( std::vector< OutputFormat > &  formats, bool  ignoreIfNoFileExtension = true  )

static

Returns the list of supported output formats.

Definition at line 106 of file QVideoEncoder.cpp.

References cloudViewer_ff_const59, QVideoEncoder::OutputFormat::extensions, format, QVideoEncoder::OutputFormat::longName, and QVideoEncoder::OutputFormat::shortName.

Referenced by qAnimationDlg::qAnimationDlg().

initFrame()

bool QVideoEncoder::initFrame ( )

protected

Definition at line 75 of file QVideoEncoder.cpp.

References FFmpegStuffEnc::codecContext, FFmpegStuffEnc::frame, and m_ff.

Referenced by open().

isOpen()

bool QVideoEncoder::isOpen ( ) const

inline

Returns whether the file is opened or not.

Definition at line 43 of file QVideoEncoder.h.

References m_isOpen.

Referenced by encodeImage().

isSizeValid()

bool QVideoEncoder::isSizeValid ( )

protected

Returns whether the image size is valid.

Definition at line 71 of file QVideoEncoder.cpp.

References m_height, and m_width.

Referenced by open().

open()

bool QVideoEncoder::open	(	QString	formatShortName,
		QStringList &	errors
	)

Creates an (empty) video/anmiation file.

Parameters

formatShortName	output format (short name) If empty, the format will be automatically guessed from the filename. If it can't be guessed this way then MPEG is used by default.
errors	(if any)

Returns

success

Definition at line 180 of file QVideoEncoder.cpp.

References cloudViewer_ff_const59, FFmpegStuffEnc::codecContext, FFmpegStuffEnc::formatContext, initFrame(), isSizeValid(), m_bitrate, m_ff, m_filename, m_fps, m_gop, m_height, m_isOpen, m_width, and FFmpegStuffEnc::videoStream.

Member Data Documentation

m_bitrate

unsigned QVideoEncoder::m_bitrate

protected

Definition at line 69 of file QVideoEncoder.h.

Referenced by open().

m_ff

FFmpegStuffEnc* QVideoEncoder::m_ff

protected

FFmpeg variables.

Definition at line 75 of file QVideoEncoder.h.

Referenced by close(), convertImage_sws(), encodeImage(), freeFrame(), initFrame(), open(), and ~QVideoEncoder().

m_filename

QString QVideoEncoder::m_filename

protected

Definition at line 66 of file QVideoEncoder.h.

Referenced by open().

m_fps

int QVideoEncoder::m_fps

protected

Definition at line 71 of file QVideoEncoder.h.

Referenced by open().

m_gop

int QVideoEncoder::m_gop

protected

Definition at line 70 of file QVideoEncoder.h.

Referenced by open().

m_height

int QVideoEncoder::m_height

protected

Definition at line 68 of file QVideoEncoder.h.

Referenced by convertImage_sws(), isSizeValid(), and open().

m_isOpen

bool QVideoEncoder::m_isOpen

protected

Definition at line 72 of file QVideoEncoder.h.

Referenced by close(), isOpen(), and open().

m_width

int QVideoEncoder::m_width

protected

Definition at line 67 of file QVideoEncoder.h.

Referenced by convertImage_sws(), isSizeValid(), and open().

---

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

• /root/ACloudViewer/plugins/core/Standard/qAnimation/extern/QTFFmpegWrapper/QVideoEncoder.h
• /root/ACloudViewer/plugins/core/Standard/qAnimation/extern/QTFFmpegWrapper/QVideoEncoder.cpp