OpenShot Library | libopenshot 0.5.0
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openshot::ReaderBase Class Referenceabstract

This abstract class is the base class, used by all readers in libopenshot. More...

#include <ReaderBase.h>

Inheritance diagram for openshot::ReaderBase:
openshot::ChunkReader openshot::Clip openshot::DummyReader openshot::FFmpegReader openshot::FrameMapper openshot::ImageReader openshot::QtHtmlReader openshot::QtImageReader openshot::QtTextReader openshot::TextReader openshot::Timeline

Public Member Functions

virtual void Close ()=0
 Close the reader (and any resources it was consuming).
void DisplayInfo (std::ostream *out=&std::cout)
 Display file information in the standard output stream (stdout).
virtual openshot::CacheBase * GetCache ()=0
 Get the cache object used by this reader (note: not all readers use cache).
virtual std::shared_ptr< openshot::Frame > GetFrame (int64_t number)=0
virtual bool IsOpen ()=0
 Determine if reader is open or closed.
virtual std::string Json () const =0
 Generate JSON string of this object.
virtual Json::Value JsonValue () const =0
 Generate Json::Value for this object.
virtual std::string Name ()=0
 Return the type name of the class.
virtual void Open ()=0
 Open the reader (and start consuming resources, such as images or video files).
openshot::ClipBase * ParentClip ()
 Parent clip object of this reader (which can be unparented and NULL).
void ParentClip (openshot::ClipBase *new_clip)
 Set parent clip object of this reader.
 ReaderBase ()
 Constructor for the base reader, where many things are initialized.
virtual void SetJson (const std::string value)=0
 Load JSON string into this object.
virtual void SetJsonValue (const Json::Value root)=0
 Load Json::Value into this object.
virtual ~ReaderBase ()=default

Public Attributes

openshot::ReaderInfo info
 Information about the current media file.

Protected Attributes

openshot::ClipBase * clip
 Pointer to the parent clip instance (if any).
std::recursive_mutex getFrameMutex
 Mutex for multiple threads.

Detailed Description

This abstract class is the base class, used by all readers in libopenshot.

Readers are types of classes that read video, audio, and image files, and return openshot::Frame objects. The only requirements for a 'reader', are to derive from this base class, implement the GetFrame method, and populate ReaderInfo.

Definition at line 75 of file ReaderBase.h.

Constructor & Destructor Documentation

◆ ReaderBase()

ReaderBase::ReaderBase ( )

Constructor for the base reader, where many things are initialized.

Definition at line 26 of file ReaderBase.cpp.

Referenced by openshot::Clip::Clip(), openshot::FrameMapper::FrameMapper(), openshot::Clip::Reader(), openshot::Clip::Reader(), openshot::FrameMapper::Reader(), and openshot::FrameMapper::Reader().

◆ ~ReaderBase()

virtual openshot::ReaderBase::~ReaderBase ( )
virtualdefault

Member Function Documentation

◆ Close()

virtual void openshot::ReaderBase::Close ( )
pure virtual

Close the reader (and any resources it was consuming).

Implemented in openshot::ChunkReader, openshot::Clip, openshot::DummyReader, openshot::FFmpegReader, openshot::FrameMapper, openshot::ImageReader, openshot::QtHtmlReader, openshot::QtImageReader, openshot::QtTextReader, openshot::TextReader, and openshot::Timeline.

◆ DisplayInfo()

void ReaderBase::DisplayInfo ( std::ostream * out = &std::cout)

Display file information in the standard output stream (stdout).

Definition at line 60 of file ReaderBase.cpp.

Referenced by openshot::QtPlayer::SetSource(), and openshot::QtPlayer::SetTimelineSource().

◆ GetCache()

virtual openshot::CacheBase * openshot::ReaderBase::GetCache ( )
pure virtual

Get the cache object used by this reader (note: not all readers use cache).

Implemented in openshot::ChunkReader, openshot::Clip, openshot::DummyReader, openshot::FFmpegReader, openshot::FrameMapper, openshot::ImageReader, openshot::QtHtmlReader, openshot::QtImageReader, openshot::QtTextReader, openshot::TextReader, and openshot::Timeline.

Referenced by openshot::Timeline::ClearAllCache().

◆ GetFrame()

virtual std::shared_ptr< openshot::Frame > openshot::ReaderBase::GetFrame ( int64_t number)
pure virtual

This method is required for all derived classes of ReaderBase, and returns the openshot::Frame object, which contains the image and audio information for that frame of video.

Returns
The requested frame of video
Parameters
[in]numberThe frame number that is requested.

Implemented in openshot::ChunkReader, openshot::Clip, openshot::DummyReader, openshot::FFmpegReader, openshot::FrameMapper, openshot::ImageReader, openshot::QtHtmlReader, openshot::QtImageReader, openshot::QtTextReader, openshot::TextReader, and openshot::Timeline.

Referenced by openshot::ChunkWriter::WriteFrame(), openshot::FFmpegWriter::WriteFrame(), and openshot::ImageWriter::WriteFrame().

◆ IsOpen()

virtual bool openshot::ReaderBase::IsOpen ( )
pure virtual

Determine if reader is open or closed.

Implemented in openshot::ChunkReader, openshot::Clip, openshot::DummyReader, openshot::FFmpegReader, openshot::FrameMapper, openshot::ImageReader, openshot::QtHtmlReader, openshot::QtImageReader, openshot::QtTextReader, openshot::TextReader, and openshot::Timeline.

◆ Json()

virtual std::string openshot::ReaderBase::Json ( ) const
pure virtual

Generate JSON string of this object.

Implemented in openshot::ChunkReader, openshot::Clip, openshot::DummyReader, openshot::FFmpegReader, openshot::FrameMapper, openshot::ImageReader, openshot::QtHtmlReader, openshot::QtImageReader, openshot::QtTextReader, openshot::TextReader, and openshot::Timeline.

◆ JsonValue()

Json::Value ReaderBase::JsonValue ( ) const
pure virtual

Generate Json::Value for this object.

Implemented in openshot::ChunkReader, openshot::Clip, openshot::DummyReader, openshot::FFmpegReader, openshot::FrameMapper, openshot::ImageReader, openshot::QtHtmlReader, openshot::QtImageReader, openshot::QtTextReader, openshot::TextReader, and openshot::Timeline.

Definition at line 106 of file ReaderBase.cpp.

Referenced by openshot::ChunkReader::JsonValue(), openshot::DummyReader::JsonValue(), openshot::FFmpegReader::JsonValue(), openshot::FrameMapper::JsonValue(), openshot::ImageReader::JsonValue(), openshot::QtHtmlReader::JsonValue(), openshot::QtImageReader::JsonValue(), openshot::QtTextReader::JsonValue(), openshot::TextReader::JsonValue(), and openshot::Timeline::JsonValue().

◆ Name()

virtual std::string openshot::ReaderBase::Name ( )
pure virtual

Return the type name of the class.

Implemented in openshot::ChunkReader, openshot::Clip, openshot::DummyReader, openshot::FFmpegReader, openshot::FrameMapper, openshot::ImageReader, openshot::QtHtmlReader, openshot::QtImageReader, openshot::QtTextReader, openshot::TextReader, and openshot::Timeline.

Referenced by openshot::Clip::Reader().

◆ Open()

virtual void openshot::ReaderBase::Open ( )
pure virtual

Open the reader (and start consuming resources, such as images or video files).

Implemented in openshot::ChunkReader, openshot::Clip, openshot::DummyReader, openshot::FFmpegReader, openshot::FrameMapper, openshot::ImageReader, openshot::QtHtmlReader, openshot::QtImageReader, openshot::QtTextReader, openshot::TextReader, and openshot::Timeline.

◆ ParentClip() [1/2]

openshot::ClipBase * ReaderBase::ParentClip ( )

Parent clip object of this reader (which can be unparented and NULL).

Definition at line 240 of file ReaderBase.cpp.

Referenced by openshot::FrameMapper::GetFrame(), and openshot::ObjectDetection::GetFrame().

◆ ParentClip() [2/2]

void ReaderBase::ParentClip ( openshot::ClipBase * new_clip)

Set parent clip object of this reader.

Definition at line 245 of file ReaderBase.cpp.

◆ SetJson()

virtual void openshot::ReaderBase::SetJson ( const std::string value)
pure virtual

Load JSON string into this object.

Implemented in openshot::ChunkReader, openshot::Clip, openshot::DummyReader, openshot::FFmpegReader, openshot::FrameMapper, openshot::ImageReader, openshot::QtHtmlReader, openshot::QtImageReader, openshot::QtTextReader, openshot::TextReader, and openshot::Timeline.

◆ SetJsonValue()

void ReaderBase::SetJsonValue ( const Json::Value root)
pure virtual

Load Json::Value into this object.

Implemented in openshot::ChunkReader, openshot::Clip, openshot::DummyReader, openshot::FFmpegReader, openshot::FrameMapper, openshot::ImageReader, openshot::QtHtmlReader, openshot::QtImageReader, openshot::QtTextReader, openshot::TextReader, and openshot::Timeline.

Definition at line 157 of file ReaderBase.cpp.

Referenced by openshot::ChunkReader::SetJsonValue(), openshot::DummyReader::SetJsonValue(), openshot::FFmpegReader::SetJsonValue(), openshot::FrameMapper::SetJsonValue(), openshot::ImageReader::SetJsonValue(), openshot::QtHtmlReader::SetJsonValue(), openshot::QtImageReader::SetJsonValue(), openshot::QtTextReader::SetJsonValue(), openshot::TextReader::SetJsonValue(), and openshot::Timeline::SetJsonValue().

Member Data Documentation

◆ clip

openshot::ClipBase* openshot::ReaderBase::clip
protected

Pointer to the parent clip instance (if any).

Definition at line 80 of file ReaderBase.h.

Referenced by openshot::Timeline::AddClip(), openshot::Timeline::ApplyMapperToClips(), openshot::Timeline::Clear(), openshot::Timeline::ClearAllCache(), openshot::Timeline::ClipEffects(), openshot::Timeline::Close(), openshot::Timeline::GetClip(), openshot::Timeline::GetClipEffect(), openshot::Timeline::GetFrame(), ParentClip(), ParentClip(), ReaderBase(), openshot::Timeline::RemoveClip(), and openshot::Timeline::Timeline().

◆ getFrameMutex

std::recursive_mutex openshot::ReaderBase::getFrameMutex
protected

Mutex for multiple threads.

Definition at line 79 of file ReaderBase.h.

Referenced by openshot::Timeline::AddClip(), openshot::Timeline::AddEffect(), openshot::Timeline::ApplyJsonDiff(), openshot::Timeline::Clear(), openshot::FFmpegReader::Close(), openshot::FrameMapper::Close(), openshot::Timeline::Close(), openshot::DummyReader::GetFrame(), openshot::FFmpegReader::GetFrame(), openshot::FrameMapper::GetFrame(), openshot::QtHtmlReader::GetFrame(), openshot::QtImageReader::GetFrame(), openshot::QtTextReader::GetFrame(), openshot::Timeline::GetFrame(), openshot::FFmpegReader::Open(), openshot::Timeline::RemoveClip(), openshot::Timeline::RemoveEffect(), openshot::Timeline::SetCache(), openshot::Timeline::SetJson(), and openshot::Timeline::SetJsonValue().

◆ info

openshot::ReaderInfo openshot::ReaderBase::info

Information about the current media file.

Definition at line 88 of file ReaderBase.h.

Referenced by openshot::Timeline::apply_effects(), openshot::FrameMapper::ChangeMapping(), openshot::FFmpegReader::Close(), openshot::QtHtmlReader::Close(), openshot::QtImageReader::Close(), openshot::QtTextReader::Close(), openshot::WriterBase::CopyReaderInfo(), DisplayInfo(), openshot::AudioWaveformer::ExtractSamples(), openshot::AudioWaveformer::ExtractSamples(), openshot::AudioWaveformer::ExtractSamples(), openshot::FFmpegReader::FFmpegReader(), openshot::FrameMapper::FrameMapper(), openshot::FFmpegReader::GetFrame(), openshot::FrameMapper::GetFrame(), openshot::QtHtmlReader::GetFrame(), openshot::QtImageReader::GetFrame(), openshot::QtTextReader::GetFrame(), openshot::Timeline::GetFrame(), openshot::FrameMapper::GetMappedFrame(), openshot::Timeline::GetMaxFrame(), openshot::Timeline::GetMinFrame(), openshot::Clip::init_reader_settings(), JsonValue(), openshot::Clip::Open(), openshot::DummyReader::Open(), openshot::FFmpegReader::Open(), openshot::ImageReader::Open(), openshot::QtHtmlReader::Open(), openshot::QtImageReader::Open(), openshot::QtTextReader::Open(), openshot::TextReader::Open(), openshot::Clip::PropertiesJSON(), ReaderBase(), openshot::FrameMapper::ResampleMappedAudio(), SetJsonValue(), openshot::Timeline::SetJsonValue(), openshot::Timeline::SetMaxSize(), openshot::QtPlayer::SetSource(), openshot::Timeline::Timeline(), openshot::Timeline::Timeline(), and openshot::Timeline::Timeline().

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