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/**
* @class dash::mpd::ITimeline
* @brief This interface is needed for accessing the attributes of <b><tt>S</tt></b> elements, as specified in <em>ISO/IEC 23009-1, Part 1, 2012</em>, section 5.3.9.6.1
* @details dash::mpd::ITimeline objects correspond to <b><tt>S</tt></b> elements of the <tt><b>SegmentTimeline</b></tt> \n \n
* The <b><tt>S</tt></b> element contains a mandatory \c \@d attribute specifying the MPD duration,
* an optional \c \@r repeat count attribute specifying the number of contiguous Segments with identical MPD duration minus one
* and an optional \c \@t time attribute specifying the MPD start time of the first Segment in the series.
* @see dash::mpd::ISegmentTimeline dash::mpd::IMultipleSegmentBase dash::mpd::IMPDElement
*
* @author bitmovin Softwareentwicklung OG \n
* Email: libdash-dev@vicky.bitmovin.net
* @version 2.1
* @date 2013
* @copyright bitmovin Softwareentwicklung OG, All Rights Reserved \n\n
* This source code and its use and distribution, is subject to the terms
* and conditions of the applicable license agreement.
*/
#ifndef ITIMELINE_H_
#define ITIMELINE_H_
#include "config.h"
#include "IMPDElement.h"
namespace dash
{
namespace mpd
{
class ITimeline : public virtual IMPDElement
{
public:
virtual ~ITimeline(){}
/**
* Returns an integer that specifies the MPD start time, in \c \@timescale units, the first Segment in the series starts relative to the beginning of the Period.\n
* The value of this attribute must be equal to or greater than the sum of the previous <tt><b>S</b></tt> element earliest presentation time and
* the sum of the contiguous Segment durations. \n
* If the value of the attribute is greater than what is expressed by the previous <tt><b>S</b></tt> element, it expresses discontinuities in the timeline.\n
* If not present then the value shall be assumed to be zero for the first S element and for the subsequent <tt><b>S</b></tt> elements,
* the value shall be assumed to be the sum of the previous <tt><b>S</b></tt> element's earliest presentation time and contiguous duration
* (i.e. previous <tt><b>S</b>\@t</tt> + \c \@d * (\c \@r + 1)).\n\n
* \em StartTime corresponds to the \c \@t attribute.
* @return an unsigned integer
*/
virtual uint32_t GetStartTime () const = 0;
/**
* Returns the integer that specifies the Segment duration, in units of the value of the \c \@timescale. \n\n
* \em Duration corresponds to the \c \@d attribute.
* @return an unsigned integer
*/
virtual uint32_t GetDuration () const = 0;
/**
* Returns an integer that specifies the repeat count of the number of following contiguous Segments with the same duration expressed by the value of \c \@d.
* This value is zero-based (e.g. a value of three means four Segments in the contiguous series). \n\n
* \em RepeatCount corresponds to the \c \@r attribute.
* @return an unsigned integer
*/
virtual uint32_t GetRepeatCount () const = 0;
};
}
}
#endif /* ITIMELINE_H_ */
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