An implementation of Ogg pages. More...

#include <oggpage.h>

Public Types

enum  ContainsPacketFlags { DoesNotContainPacket = 0x0000, CompletePacket = 0x0001, BeginsWithPacket = 0x0002, EndsWithPacket = 0x0004 }
enum  PaginationStrategy { SinglePagePerGroup, Repaginate }

Public Member Functions

 Page (File *file, long pageOffset)
virtual ~Page ()
long fileOffset () const
const PageHeaderheader () const
PagegetCopyWithNewPageSequenceNumber (int sequenceNumber)
int firstPacketIndex () const
void setFirstPacketIndex (int index)
ContainsPacketFlags containsPacket (int index) const
uint packetCount () const
ByteVectorList packets () const
int size () const
ByteVector render () const

Static Public Member Functions

static List< Page * > paginate (const ByteVectorList &packets, PaginationStrategy strategy, uint streamSerialNumber, int firstPage, bool firstPacketContinued=false, bool lastPacketCompleted=true, bool containsLastPacket=false)

Protected Member Functions

 Page (const ByteVectorList &packets, uint streamSerialNumber, int pageNumber, bool firstPacketContinued=false, bool lastPacketCompleted=true, bool containsLastPacket=false)

Detailed Description

An implementation of Ogg pages.

This is an implementation of the pages that make up an Ogg stream. This handles parsing pages and breaking them down into packets and handles the details of packets spanning multiple pages and pages that contiain multiple packets.

In most Xiph.org formats the comments are found in the first few packets, this however is a reasonably complete implementation of Ogg pages that could potentially be useful for non-meta data purposes.

Member Enumeration Documentation

When checking to see if a page contains a given packet this set of flags represents the possible values for that packets status in the page.

See Also
containsPacket()
Enumerator:
DoesNotContainPacket 

No part of the packet is contained in the page.

CompletePacket 

The packet is wholly contained in the page.

BeginsWithPacket 

The page starts with the given packet.

EndsWithPacket 

The page ends with the given packet.

Defines a strategy for pagination, or grouping pages into Ogg packets, for use with pagination methods.

Note
Yes, I'm aware that this is not a canonical "Strategy Pattern", the term was simply convenient.
Enumerator:
SinglePagePerGroup 

Attempt to put the specified set of packets into a single Ogg packet. If the sum of the packet data is greater than will fit into a single Ogg page – 65280 bytes – this will fall back to repagination using the recommended page sizes.

Repaginate 

Split the packet or group of packets into pages that conform to the sizes recommended in the Ogg standard.

Constructor & Destructor Documentation

TagLib::Ogg::Page::Page ( File file,
long  pageOffset 
)

Read an Ogg page from the file at the position pageOffset.

virtual TagLib::Ogg::Page::~Page ( )
virtual
TagLib::Ogg::Page::Page ( const ByteVectorList packets,
uint  streamSerialNumber,
int  pageNumber,
bool  firstPacketContinued = false,
bool  lastPacketCompleted = true,
bool  containsLastPacket = false 
)
protected

Creates an Ogg packet based on the data in packets. The page number for each page will be set to pageNumber.

Member Function Documentation

ContainsPacketFlags TagLib::Ogg::Page::containsPacket ( int  index) const

Checks to see if the specified packet is contained in the current page.

See Also
ContainsPacketFlags
long TagLib::Ogg::Page::fileOffset ( ) const

Returns the page's position within the file (in bytes).

int TagLib::Ogg::Page::firstPacketIndex ( ) const

Returns the index of the first packet wholly or partially contained in this page.

See Also
setFirstPacketIndex()
Page* TagLib::Ogg::Page::getCopyWithNewPageSequenceNumber ( int  sequenceNumber)

Returns a copy of the page with sequenceNumber set as sequence number.

See Also
header()
PageHeader::setPageSequenceNumber()
const PageHeader* TagLib::Ogg::Page::header ( ) const

Returns a pointer to the header for this page. This pointer will become invalid when the page is deleted.

uint TagLib::Ogg::Page::packetCount ( ) const

Returns the number of packets (whole or partial) in this page.

ByteVectorList TagLib::Ogg::Page::packets ( ) const

Returns a list of the packets in this page.

Note
Either or both the first and last packets may be only partial.
See Also
PageHeader::firstPacketContinued()
static List<Page *> TagLib::Ogg::Page::paginate ( const ByteVectorList packets,
PaginationStrategy  strategy,
uint  streamSerialNumber,
int  firstPage,
bool  firstPacketContinued = false,
bool  lastPacketCompleted = true,
bool  containsLastPacket = false 
)
static

Pack packets into Ogg pages using the strategy for pagination. The page number indicater inside of the rendered packets will start with firstPage and be incremented for each page rendered. containsLastPacket should be set to true if packets contains the last page in the stream and will set the appropriate flag in the last rendered Ogg page's header. streamSerialNumber should be set to the serial number for this stream.

Note
The "absolute granule position" is currently always zeroed using this method as this suffices for the comment headers.
Warning
The pages returned by this method must be deleted by the user. You can use List<T>::setAutoDelete(true) to set these pages to be automatically deleted when this list passes out of scope.
See Also
PaginationStrategy
List::setAutoDelete()
ByteVector TagLib::Ogg::Page::render ( ) const
void TagLib::Ogg::Page::setFirstPacketIndex ( int  index)

Sets the index of the first packet in the page.

See Also
firstPacketIndex()
int TagLib::Ogg::Page::size ( ) const

Returns the size of the page in bytes.


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