Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

Add interactions with capture/presentation/receive/RTP timestamps #112

Draft
wants to merge 1 commit into
base: main
Choose a base branch
from
Draft

Add interactions with capture/presentation/receive/RTP timestamps #112

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
17 changes: 14 additions & 3 deletions index.bs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -21,6 +21,10 @@ url: https://streams.spec.whatwg.org/#readablestream-controller; text: [[control
<pre class=link-defaults>
spec:infra; type:dfn; text:queue
spec:streams; type:interface; text:WritableStream
spec:mediacapture-extensions; type:dfn; text:capture timestamp
spec:mediacapture-extensions; type:dfn; text:presentation timestamp
spec:mediacapture-extensions; type:dfn; text:receive timestamp
spec:mediacapture-extensions; type:dfn; text:RTP timestamp
</pre>

# Introduction # {#introduction}
Expand Down Expand Up @@ -218,8 +222,12 @@ It is defined by running the following steps:
1. If |processor|.`[[queue]]` has |processor|.`[[maxBufferSize]]` elements, run the following steps:
1. Let |droppedFrame| be the result of [=queue/dequeueing=] |processor|.`[[queue]]`.
1. Run the [=Close VideoFrame=] algorithm with |droppedFrame|.
2. [=queue/Enqueue=] the new frame media data in |processor|.`[[queue]]`.
3. [=Queue a task=] to run the [=maybeReadFrame=] algorithm with |processor| as parameter.
1. Initialize {{VideoFrame/timestamp}} from [=presentation timestamp=] if set, otherwise leave the attribute [=map/exist|not present=].
1. Initialize {{VideoFrameMetadata/captureTime}} from [=capture timestamp=] if set, otherwise leave the attribute [=map/exist|not present=].
1. Initialize {{VideoFrameMetadata/receiveTime}} from [=receive timestamp=] if set, otherwise leave the attribute [=map/exist|not present=].
1. Initialize {{VideoFrameMetadata/rtpTimestamp}} from [=RTP timestamp=] if set, otherwise leave the attribute [=map/exist|not present=].
1. [=queue/Enqueue=] the new frame media data in |processor|.`[[queue]]`.
1. [=Queue a task=] to run the [=maybeReadFrame=] algorithm with |processor| as parameter.

At any time, the UA MAY [=list/remove=] any frame from |processor|.`[[queue]]`.
The UA may decide to remove frames from |processor|.`[[queue]]`, for example,
Expand All @@ -236,7 +244,6 @@ When the `[[track]]` of a {{MediaStreamTrackProcessor}} |processor|
[=track|ends=], the [=processorClose=] algorithm must be
executed with |processor| as parameter.


## VideoTrackGenerator ## {#video-track-generator}
A {{VideoTrackGenerator}} allows the creation of a video source for a
{{MediaStreamTrack}} in the
Expand Down Expand Up @@ -306,6 +313,10 @@ The <dfn>writeFrame</dfn> algorithm is given a |generator| and a |frame| as inpu
1. If the value of |frame|’s {{platform object/[[Detached]]}} internal slot is true, return [=a promise rejected with=] a {{TypeError}}.
1. If |generator|.`[[isMuted]]` is false, for each live track sourced from |generator|, named |track|, run the following steps:
1. Let |clone| be the result of running the [=Clone videoFrame=] algorithm with |frame|.
1. Set [=presentation timestamp=] to the value of {{VideoFrame/timestamp}}.
1. Set [=capture timestamp=] to the value of {{VideoFrameMetadata/captureTime}} if [=map/exist|present=].
1. Set [=receive timestamp=] to the value of {{VideoFrameMetadata/receiveTime}} if [=map/exist|present=].
1. Set [=RTP timestamp=] to the value of {{VideoFrameMetadata/rtpTimestamp}} if [=map/exist|present=].
1. Send |clone| to |track|.
1. Run the [=Close VideoFrame=] algorithm with |frame|.
1. Return [=a promise resolved with=] undefined.
Expand Down
Loading