2015-04-22 19:22:01 +02:00
|
|
|
#ifndef MEDIA_OGGITERATOR_H
|
|
|
|
#define MEDIA_OGGITERATOR_H
|
|
|
|
|
2015-09-06 19:57:33 +02:00
|
|
|
#include "./oggpage.h"
|
2015-04-22 19:22:01 +02:00
|
|
|
|
|
|
|
#include <istream>
|
|
|
|
#include <vector>
|
|
|
|
|
|
|
|
namespace Media {
|
|
|
|
|
|
|
|
class LIB_EXPORT OggIterator
|
|
|
|
{
|
|
|
|
public:
|
|
|
|
OggIterator(std::istream &stream, uint64 startOffset, uint64 streamSize);
|
|
|
|
|
|
|
|
std::istream &stream();
|
|
|
|
void setStream(std::istream &stream);
|
|
|
|
void reset();
|
|
|
|
void nextPage();
|
|
|
|
void nextSegment();
|
|
|
|
void previousPage();
|
|
|
|
void previousSegment();
|
|
|
|
const std::vector<OggPage> &pages() const;
|
|
|
|
const OggPage ¤tPage() const;
|
|
|
|
std::vector<OggPage>::size_type currentPageIndex() const;
|
|
|
|
void setPageIndex(std::vector<OggPage>::size_type index);
|
|
|
|
void setSegmentIndex(std::vector<uint32>::size_type index);
|
|
|
|
std::vector<uint32>::size_type currentSegmentIndex() const;
|
|
|
|
uint64 currentSegmentOffset() const;
|
|
|
|
uint64 currentCharacterOffset() const;
|
|
|
|
uint32 currentSegmentSize() const;
|
|
|
|
void setFilter(uint32 streamSerialId);
|
|
|
|
void removeFilter();
|
|
|
|
bool areAllPagesFetched() const;
|
|
|
|
void read(char *buffer, size_t count);
|
|
|
|
void seekForward(size_t count);
|
|
|
|
|
|
|
|
operator bool() const;
|
|
|
|
OggIterator &operator ++();
|
|
|
|
OggIterator operator ++(int);
|
|
|
|
OggIterator &operator --();
|
|
|
|
OggIterator operator --(int);
|
|
|
|
|
|
|
|
private:
|
|
|
|
bool fetchNextPage();
|
|
|
|
bool matchesFilter(const OggPage &page);
|
|
|
|
|
|
|
|
std::istream *m_stream;
|
|
|
|
uint64 m_startOffset;
|
|
|
|
uint64 m_streamSize;
|
|
|
|
std::vector<OggPage> m_pages;
|
|
|
|
std::vector<OggPage>::size_type m_page;
|
|
|
|
std::vector<uint32>::size_type m_segment;
|
|
|
|
uint64 m_offset;
|
|
|
|
uint32 m_bytesRead;
|
|
|
|
bool m_hasIdFilter;
|
|
|
|
uint32 m_idFilter;
|
|
|
|
};
|
|
|
|
|
|
|
|
/*!
|
|
|
|
* \brief Constructs a new iterator for the specified \a stream of \a streamSize bytes at the specified \a startOffset.
|
|
|
|
*/
|
|
|
|
inline OggIterator::OggIterator(std::istream &stream, uint64 startOffset, uint64 streamSize) :
|
|
|
|
m_stream(&stream),
|
|
|
|
m_startOffset(startOffset),
|
|
|
|
m_streamSize(streamSize),
|
|
|
|
m_page(0),
|
|
|
|
m_segment(0),
|
|
|
|
m_offset(0),
|
|
|
|
m_bytesRead(0),
|
|
|
|
m_hasIdFilter(false),
|
|
|
|
m_idFilter(0)
|
|
|
|
{}
|
|
|
|
|
|
|
|
/*!
|
|
|
|
* \brief Returns the stream.
|
|
|
|
*
|
|
|
|
* The stream has been specified when constructing the iterator and might be changed using the setStream() methods.
|
|
|
|
*/
|
|
|
|
inline std::istream &OggIterator::stream()
|
|
|
|
{
|
|
|
|
return *m_stream;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*!
|
|
|
|
* \brief Sets the stream.
|
|
|
|
* \remarks The new stream must have the same data as the old stream to keep the iterator in a sane state.
|
|
|
|
* \sa stream()
|
|
|
|
*/
|
|
|
|
inline void OggIterator::setStream(std::istream &stream)
|
|
|
|
{
|
|
|
|
m_stream = &stream;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*!
|
|
|
|
* \brief Returns a vector of containing the OGG pages that have been fetched yet.
|
|
|
|
*/
|
|
|
|
inline const std::vector<OggPage> &OggIterator::pages() const
|
|
|
|
{
|
|
|
|
return m_pages;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*!
|
|
|
|
* \brief Returns the current OGG page.
|
|
|
|
* \remarks Calling this method when the iterator is invalid causes undefined behaviour.
|
|
|
|
*/
|
|
|
|
inline const OggPage &OggIterator::currentPage() const
|
|
|
|
{
|
|
|
|
return m_pages[m_page];
|
|
|
|
}
|
|
|
|
|
|
|
|
/*!
|
|
|
|
* \brief Returns an indication whether the iterator is valid.
|
|
|
|
*
|
|
|
|
* The iterator is invalid when it has just been constructed. Incrementing and decrementing
|
|
|
|
* might cause invalidation.
|
|
|
|
*
|
|
|
|
* If the iterator is invalid, it can be reseted using the reset() method.
|
|
|
|
*
|
|
|
|
* Some methods might cause undefined behaviour if called on an invalid iterator.
|
|
|
|
*/
|
|
|
|
inline OggIterator::operator bool() const
|
|
|
|
{
|
|
|
|
return m_page < m_pages.size() && m_segment < m_pages[m_page].segmentSizes().size();
|
|
|
|
}
|
|
|
|
|
|
|
|
/*!
|
|
|
|
* \brief Returns the index of the current page if the iterator is valid; otherwise an undefined index is returned.
|
|
|
|
*/
|
|
|
|
inline std::vector<OggPage>::size_type OggIterator::currentPageIndex() const
|
|
|
|
{
|
|
|
|
return m_page;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*!
|
|
|
|
* \brief Sets the current page index.
|
|
|
|
*
|
|
|
|
* This method should never be called with an \a index out of range (which is the defined by the number of fetched pages), since this causes undefined behaviour.
|
|
|
|
*/
|
|
|
|
inline void OggIterator::setPageIndex(std::vector<OggPage>::size_type index)
|
|
|
|
{
|
|
|
|
const OggPage &page = m_pages[m_page = index];
|
|
|
|
m_segment = 0;
|
|
|
|
m_offset = page.startOffset() + page.headerSize();
|
|
|
|
}
|
|
|
|
|
|
|
|
/*!
|
|
|
|
* \brief Sets the current segment index.
|
|
|
|
*
|
|
|
|
* This method should never be called with an \a index out of range (which is defined by the number of segments in the current page), since this causes undefined behaviour.
|
|
|
|
*/
|
|
|
|
inline void OggIterator::setSegmentIndex(std::vector<uint32>::size_type index)
|
|
|
|
{
|
|
|
|
const OggPage &page = m_pages[m_page];
|
|
|
|
m_offset = page.dataOffset(m_segment = index);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*!
|
|
|
|
* \brief Returns the index of the current segment (in the current page) if the iterator is valid; otherwise an undefined index is returned.
|
|
|
|
*/
|
|
|
|
inline std::vector<uint32>::size_type OggIterator::currentSegmentIndex() const
|
|
|
|
{
|
|
|
|
return m_segment;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*!
|
|
|
|
* \brief Returns the start offset of the current segment in the input stream if the iterator is valid; otherwise an undefined offset is returned.
|
|
|
|
* \sa currentCharacterOffset()
|
|
|
|
*/
|
|
|
|
inline uint64 OggIterator::currentSegmentOffset() const
|
|
|
|
{
|
|
|
|
return m_offset;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*!
|
|
|
|
* \brief Returns the offset of the current character in the input stream if the iterator is valid; otherwise an undefined offset is returned.
|
|
|
|
* \sa currentSegmentOffset()
|
|
|
|
*/
|
|
|
|
inline uint64 OggIterator::currentCharacterOffset() const
|
|
|
|
{
|
|
|
|
return m_offset + m_bytesRead;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*!
|
|
|
|
* \brief Returns the size of the current segment.
|
|
|
|
*
|
|
|
|
* This method should never be called on an invalid iterator, since this causes undefined behaviour.
|
|
|
|
*/
|
|
|
|
inline uint32 OggIterator::currentSegmentSize() const
|
|
|
|
{
|
|
|
|
return m_pages[m_page].segmentSizes()[m_segment];
|
|
|
|
}
|
|
|
|
|
|
|
|
/*!
|
|
|
|
* \brief Allows to filter pages by the specified \a streamSerialId.
|
|
|
|
*
|
|
|
|
* Pages which do not match the specified \a streamSerialId will be skipped when getting the previous or
|
|
|
|
* the next page.
|
|
|
|
*
|
|
|
|
* \sa removeFilter()
|
|
|
|
*/
|
|
|
|
inline void OggIterator::setFilter(uint32 streamSerialId)
|
|
|
|
{
|
|
|
|
m_hasIdFilter = true;
|
|
|
|
m_idFilter = streamSerialId;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*!
|
|
|
|
* \brief Removes a previously set filter.
|
|
|
|
* \sa setFilter()
|
|
|
|
*/
|
|
|
|
inline void OggIterator::removeFilter()
|
|
|
|
{
|
|
|
|
m_hasIdFilter = false;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*!
|
|
|
|
* \brief Returns an indication whether all pages have been fetched.
|
|
|
|
*
|
|
|
|
* This means that for each page in the stream in the specified range (stream and range have been specified when
|
|
|
|
* constructing the iterator) an OggPage instance has been created and pushed to pages(). This is independend from
|
|
|
|
* the current iterator position. Fetched pages remain after resetting the iterator.
|
|
|
|
*/
|
|
|
|
inline bool OggIterator::areAllPagesFetched() const
|
|
|
|
{
|
|
|
|
return (m_pages.empty() ? m_startOffset : m_pages.back().startOffset() + m_pages.back().totalSize()) >= m_streamSize;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*!
|
|
|
|
* \brief Increments the current position by one segment if the iterator is valid; otherwise nothing happens.
|
|
|
|
*/
|
|
|
|
inline OggIterator &OggIterator::operator ++()
|
|
|
|
{
|
|
|
|
nextSegment();
|
|
|
|
return *this;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*!
|
|
|
|
* \brief Increments the current position by one segment if the iterator is valid; otherwise nothing happens.
|
|
|
|
*/
|
|
|
|
inline OggIterator OggIterator::operator ++(int)
|
|
|
|
{
|
|
|
|
OggIterator tmp = *this;
|
|
|
|
nextSegment();
|
|
|
|
return tmp;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*!
|
|
|
|
* \brief Decrements the current position by one segment if the iterator is valid; otherwise nothing happens.
|
|
|
|
*/
|
|
|
|
inline OggIterator &OggIterator::operator --()
|
|
|
|
{
|
|
|
|
previousSegment();
|
|
|
|
return *this;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*!
|
|
|
|
* \brief Decrements the current position by one segment if the iterator is valid; otherwise nothing happens.
|
|
|
|
*/
|
|
|
|
inline OggIterator OggIterator::operator --(int)
|
|
|
|
{
|
|
|
|
OggIterator tmp = *this;
|
|
|
|
previousSegment();
|
|
|
|
return tmp;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*!
|
|
|
|
* \brief Returns whether the specified \a page matches the current filter.
|
|
|
|
*/
|
|
|
|
inline bool OggIterator::matchesFilter(const OggPage &page)
|
|
|
|
{
|
|
|
|
return !m_hasIdFilter || m_idFilter == page.streamSerialNumber();
|
|
|
|
}
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
#endif // MEDIA_OGGITERATOR_H
|