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Explicitly clone/close VideoFrames in generator and processor #108

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Feb 15, 2024
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Explicitly clone/close VideoFrames in generator and processor #108

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Explicitly clone/close VideoFrames in generator and processor
youennf Feb 8, 2024
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Update index.bs
youennf Feb 15, 2024
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19 changes: 12 additions & 7 deletions index.bs
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Expand Up @@ -186,10 +186,11 @@ The <dfn>processorPull</dfn> algorithm is given a |processor| as input. It is de

The <dfn>maybeReadFrame</dfn> algorithm is given a |processor| as input. It is defined by the following steps:
1. If |processor|.`[[queue]]` is [=queue/empty=], abort these steps.
2. If |processor|.`[[numPendingReads]]` equals zero, abort these steps.
3. [=queue/Dequeue=] a frame from |processor|.`[[queue]]` and [=ReadableStream/Enqueue=] it in |processor|.{{MediaStreamTrackProcessor/readable}}.
4. Decrement |processor|.`[[numPendingReads]]` by 1.
5. Go to step 1.
1. If |processor|.`[[numPendingReads]]` equals zero, abort these steps.
1. Let |frame| be the result of [=queue/dequeueing=] a frame media data from |processor|.`[[queue]]`.
1. [=ReadableStream/Enqueue=] |frame| in |processor|.{{MediaStreamTrackProcessor/readable}}.
1. Decrement |processor|.`[[numPendingReads]]` by 1.
1. Go to step 1.

The <dfn>processorCancel</dfn> algorithm is given a |processor| as input.
It is defined by running the following steps:
Expand All @@ -214,8 +215,10 @@ with |processor| as parameter.

The <dfn>handleNewFrame</dfn> algorithm is given a |processor| as input.
It is defined by running the following steps:
1. If |processor|.`[[queue]]` has |processor|.`[[maxBufferSize]]` elements, [=queue/dequeue=] an item from |processor|.`[[queue]]`.
2. [=queue/Enqueue=] the new frame in |processor|.`[[queue]]`.
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.

At any time, the UA MAY [=list/remove=] any frame from |processor|.`[[queue]]`.
Expand Down Expand Up @@ -301,7 +304,9 @@ is accessed for the first time, it MUST be initialized with the following steps:
The <dfn>writeFrame</dfn> algorithm is given a |generator| and a |frame| as input. It is defined by running the following steps:
1. If |frame| is not a {{VideoFrame}} object, return [=a promise rejected with=] a {{TypeError}}.
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, send the media data backing |frame| to all live tracks sourced from |generator|.
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. Send |clone| to |track|.
1. Run the [=Close VideoFrame=] algorithm with |frame|.
1. Return [=a promise resolved with=] undefined.

Expand Down