DASHAlgorithm interface

DASH and HLS user-defined rate adaptation algorithms. More...

Collaboration diagram for DASHAlgorithm interface:

Data Structures
interface	_DASHCustomAlgorithm
interface	_DASHGroup
interface	_DASHQualityInfo
interface	_DASHSegmentInfo
interface	_DASHGroupStatistics
interface	_DASHSRD

Detailed Description

The DASH demuxer can be provided with a custom JS algorithm, provided as an object implementing the the DASHAlgorithm interface.

When running the session in multithreaded mode, the dash demuxer will always be scheduled on the main thread if a custom algorithm is bound.

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Data Structure Documentation

_DASHGroup

interface _DASHGroup

interface for custom DASH groups

Collaboration diagram for _DASHGroup:

Data Fields
attribute readonly	idx	Index of group, as used in callbacks
attribute readonly Array	qualities	List of _DASHQualityInfo for group
attribute readonly unsigned long	duration	period duration in milliseconds, 0 if unknown
_DASHSRD	SRD	SRD object or null if no SRD defined

_DASHQualityInfo

interface _DASHQualityInfo

interface for custom DASH groups

Data Fields
attribute readonly unsigned long	bandwidth	bandwidth in bits per second
attribute readonly DOMString	ID	ID (representation ID in DASH)
attribute readonly DOMString	mime	MIME type
attribute readonly DOMString	codec	codec parameter string
attribute readonly unsigned long	width	width in pixels, 0 if not visual
attribute readonly unsigned long	height	height in pixels, 0 if not visual
attribute readonly boolean	interlaced	interlaced flag, false 0 if not visual
attribute readonly _Fraction	fps	Frame Rate (Fraction), 0/0 if not visual
attribute readonly _Fraction	sar	Sample Aspect Ration (Fraction), 0/0 if not visual
attribute readonly unsigned long	sample_rate	Samplerate, 0 if not audio
attribute readonly unsigned long	nb_channels	Number of channels, 0 if not audio
attribute readonly disabled	disabled	set to true if quality is disabled (no playback support)
attribute readonly boolean	is_selected	set to true if quality is selected
attribute readonly double	ast_offset	AST offset for DASH low latency mode, 0 otherwise
attribute readonly double	avg_duration	Average segment duration in seconds, 0 if unknown
attribute readonly Array	sizes	list of segment _DASHSegmentInfo for onDemand profiles or empty otherwise

_DASHSegmentInfo

interface _DASHSegmentInfo

segemnt size info

Data Fields
attribute readonly unsigned long long	size	segemnt size
attribute readonly unsigned long	duration	segemnt duration

_DASHGroupStatistics

interface _DASHGroupStatistics

statistics for rate adaptation

statistics for download monitoring

Data Fields
attribute readonly unsigned long	download_rate	download rate of last segment in bits per second, divided by current playback speed
attribute readonly unsigned long	file_size	size of last segment in bytes
attribute readonly double	speed	current playback speed
attribute readonly double	max_available_speed	max playback speed based on associated codec runtime statistics
attribute readonly unsigned long	display_width	display width in pixels of object
attribute readonly unsigned long	display_height	display height in pixels of object
attribute readonly unsigned long	active_quality_idx	index of current quality or last downloaded quality
attribute readonly unsigned long	buffer_min	minimum buffer in milliseconds, below witch rebuffer occurs
attribute readonly unsigned long self	buffer_max	maximum buffer in milliseconds, algorithm should not fill more than this
attribute readonly unsigned long self	buffer	current buffer in milliseconds
attribute readonly unsigned long self	quality_degradation_hint	degradation hint, 0 means no degradation, 100 means tile completely hidden
attribute readonly unsigned long self	total_rate	cumulated download rate of all active groups in bytes per seconds - 0 means all files are local
attribute readonly unsigned long	bits_per_sec	download rate of last segment in bits per second
attribute readonly unsigned long	total_bytes	total number of bytes in segment
attribute readonly unsigned long long	bytes_done	number of downloaded bytes from segment (starting from first byte)
attribute readonly unsigned longlong	time_since_start	number of microseconds elapsed since segment was scheduled for download
attribute readonly unsigned long	buffer_dur	current buffer length in milliseconds
attribute readonly unsigned long	current_seg_dur	duration of segment being downloaded, in milliseconds - 0 if unknown

_DASHSRD

interface _DASHSRD

Spacial Relationship Descriptor for DASH group

Data Fields
attribute readonly unsigned long	x	X coordinate of SRD for this tile
attribute readonly unsigned long	y	Y coordinate of SRD for this tile
attribute readonly unsigned long	w	width of SRD for this tile - 0 for tile base track
attribute readonly unsigned long	h	height of SRD for this tile - 0 for tile base track
attribute readonly unsigned long	fw	total width of SRD descriptor for this tile
attribute readonly unsigned long	fh	total height of SRD descriptor for this tile