OpenShot Audio Library | OpenShotAudio 0.3.2
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juce::SubregionStream Class Reference

#include <juce_SubregionStream.h>

Inheritance diagram for juce::SubregionStream:
juce::InputStream

Public Member Functions

 SubregionStream (InputStream *sourceStream, int64 startPositionInSourceStream, int64 lengthOfSourceStream, bool deleteSourceWhenDestroyed)
 
 ~SubregionStream () override
 
int64 getTotalLength () override
 
int64 getPosition () override
 
bool setPosition (int64 newPosition) override
 
int read (void *destBuffer, int maxBytesToRead) override
 
bool isExhausted () override
 
- Public Member Functions inherited from juce::InputStream
virtual ~InputStream ()=default
 
int64 getNumBytesRemaining ()
 
ssize_t read (void *destBuffer, size_t maxBytesToRead)
 
virtual char readByte ()
 
virtual bool readBool ()
 
virtual short readShort ()
 
virtual short readShortBigEndian ()
 
virtual int readInt ()
 
virtual int readIntBigEndian ()
 
virtual int64 readInt64 ()
 
virtual int64 readInt64BigEndian ()
 
virtual float readFloat ()
 
virtual float readFloatBigEndian ()
 
virtual double readDouble ()
 
virtual double readDoubleBigEndian ()
 
virtual int readCompressedInt ()
 
virtual String readNextLine ()
 
virtual String readString ()
 
virtual String readEntireStreamAsString ()
 
virtual size_t readIntoMemoryBlock (MemoryBlock &destBlock, ssize_t maxNumBytesToRead=-1)
 
virtual void skipNextBytes (int64 numBytesToSkip)
 

Detailed Description

Wraps another input stream, and reads from a specific part of it.

This lets you take a subsection of a stream and present it as an entire stream in its own right.

Definition at line 34 of file juce_SubregionStream.h.

Constructor & Destructor Documentation

◆ SubregionStream()

juce::SubregionStream::SubregionStream ( InputStream sourceStream,
int64  startPositionInSourceStream,
int64  lengthOfSourceStream,
bool  deleteSourceWhenDestroyed 
)

Creates a SubregionStream from an input source.

Parameters
sourceStreamthe source stream to read from
startPositionInSourceStreamthis is the position in the source stream that corresponds to position 0 in this stream
lengthOfSourceStreamthis specifies the maximum number of bytes from the source stream that will be passed through by this stream. When the position of this stream exceeds lengthOfSourceStream, it will cause an end-of-stream. If the length passed in here is greater than the length of the source stream (as returned by getTotalLength()), then the smaller value will be used. Passing a negative value for this parameter means it will keep reading until the source's end-of-stream.
deleteSourceWhenDestroyedwhether the sourceStream that is passed in should be deleted by this object when it is itself deleted.

Definition at line 26 of file juce_SubregionStream.cpp.

◆ ~SubregionStream()

juce::SubregionStream::~SubregionStream ( )
override

Destructor.

This may also delete the source stream, if that option was chosen when the buffered stream was created.

Definition at line 36 of file juce_SubregionStream.cpp.

Member Function Documentation

◆ getPosition()

int64 juce::SubregionStream::getPosition ( )
overridevirtual

Returns the offset of the next byte that will be read from the stream.

See also
setPosition

Implements juce::InputStream.

Definition at line 48 of file juce_SubregionStream.cpp.

Referenced by isExhausted(), and read().

◆ getTotalLength()

int64 juce::SubregionStream::getTotalLength ( )
overridevirtual

Returns the total number of bytes available for reading in this stream.

Note that this is the number of bytes available from the start of the stream, not from the current position.

If the size of the stream isn't actually known, this will return -1.

See also
getNumBytesRemaining

Implements juce::InputStream.

Definition at line 40 of file juce_SubregionStream.cpp.

◆ isExhausted()

bool juce::SubregionStream::isExhausted ( )
overridevirtual

Returns true if the stream has no more data to read.

Implements juce::InputStream.

Definition at line 73 of file juce_SubregionStream.cpp.

◆ read()

int juce::SubregionStream::read ( void destBuffer,
int  maxBytesToRead 
)
overridevirtual

Reads some data from the stream into a memory buffer.

This is the only read method that subclasses actually need to implement, as the InputStream base class implements the other read methods in terms of this one (although it's often more efficient for subclasses to implement them directly).

Parameters
destBufferthe destination buffer for the data. This must not be null.
maxBytesToReadthe maximum number of bytes to read - make sure the memory block passed in is big enough to contain this many bytes. This value must not be negative.
Returns
the actual number of bytes that were read, which may be less than maxBytesToRead if the stream is exhausted before it gets that far

Implements juce::InputStream.

Definition at line 58 of file juce_SubregionStream.cpp.

◆ setPosition()

bool juce::SubregionStream::setPosition ( int64  newPosition)
overridevirtual

Tries to move the current read position of the stream.

The position is an absolute number of bytes from the stream's start.

Some streams might not be able to do this, in which case they should do nothing and return false. Others might be able to manage it by resetting themselves and skipping to the correct position, although this is obviously a bit slow.

Returns
true if the stream manages to reposition itself correctly
See also
getPosition

Implements juce::InputStream.

Definition at line 53 of file juce_SubregionStream.cpp.

Referenced by SubregionStream().


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