Constructor
new StreamBandwidthEstimator()
Members
DEFAULT_AUDIO_BITRATE_ :number
Since audio bandwidth does not vary much, we are going to use a constant
approximation for audio bit rate allowing use to more accurately guess at
the video bitrate.
YouTube's suggested bitrate for stereo audio is 384 kbps so we are going to
assume that: https://support.google.com/youtube/answer/1722171?hl=en
Type:
- number
DEFAULT_IMAGE_BITRATE_ :number
Since we don't normally get the bitrate for image, we still want to create
some approximation so that it can influence progress.
The size of the thumbnail usually is 2KB.
Type:
- number
DEFAULT_TEXT_BITRATE_ :number
Since we don't normally get the bitrate for text, we still want to create
some approximation so that it can influence progress. This will use the
bitrate from "Tears of Steal" to give some kind of data-driven result.
The file size for English subtitles is 4.7 KB. The video is 12:14 long,
which means that the text's bit rate is around 52 bps.
Type:
- number
estimateByStreamId_ :Object.<number, number>
Type:
- Object.<number, number>
Methods
addImage(image)
Create an estimate for the image stream.
Parameters:
Name | Type | Description |
---|---|---|
image |
shaka.extern.Stream |
addText(text)
Create an estimate for the text stream.
Parameters:
Name | Type | Description |
---|---|---|
text |
shaka.extern.Stream |
addVariant(variant)
Add a new variant to the estimator. This will update the estimates for all
streams in the variant.
Parameters:
Name | Type | Description |
---|---|---|
variant |
shaka.extern.Variant |
getEstimate_(id) → {number}
Parameters:
Name | Type | Description |
---|---|---|
id |
number |
Returns:
- Type
- number
getInitSegmentEstimate(id) → {number}
Get the estimate for an init segment for a stream that has already
added to the estimator.
Parameters:
Name | Type | Description |
---|---|---|
id |
number |
Returns:
- Type
- number
getSegmentEstimate(id, segmentnon-null) → {number}
Get the estimate for a segment that is part of a stream that has already
added to the estimator.
Parameters:
Name | Type | Description |
---|---|---|
id |
number | |
segment |
shaka.media.SegmentReference |
Returns:
- Type
- number
setBitrate_(stream, bitRate)
Parameters:
Name | Type | Description |
---|---|---|
stream |
number | |
bitRate |
number |