879672 - [MediaEncoder] Connect MediaStreamAudioDestinationNode::MediaStream with Audio recording API

Status: RESOLVED DUPLICATE of bug 896353

(Core :: Web Audio, defect)

Description

[u459114]

MediaStreamAudioDestinationNode is a destination node in WebAudio. MediaStreamAudioDestinationNode aggregate a media stream object, which can be an input of Media recorder. MediaRecoder should be able to generate encode blob from MediaStreamAudioDestinationNode::MediaStream correctly.

Comment 1

[(no longer active)]

Hmm, I'm not sure if I understand what this bug is about.  Could you please explain what you need a bit more?  Thanks!

Comment 2

[u459114]

Sure.
After Bug 865257 complete, we could assign a MediaStreamAudioDestinationNode node as desination node in web audio graph. sample code looks like:

var node = atx.createMediaStreamDestination();
var mr = new MediaRecorder(node.stream);

By taking MediaStreamAudioDestinationNode.stream as input of MediaRecoder, we are able to record and encode audio stream. Apps, such as audio mixer, need this kind of feature.

Comment 3

[(no longer active)]

I see.  I was not aware that we have an implementation of MediaRecorder.  Has it landed yet?  Or is there a bug for that?

Comment 4

[u459114]

Bug 803414 - MediaRecorder WebAPI. To support this API, we need to have native media encoding framework.
Bug 879688 - which is the meta issue for media encoder.

Comment 5

[(no longer active)]

Can you please tell us more about what needs to happen in this bug?

Comment 6

[u459114]

Thanks for reminding.
If we create a new MediaRecorder and boundle that MediaRecorder with a MediaStreamAudioDestinationNode::MediaStream, it should be able to get encoded audio samples from onDataAvailable function or manually request by mr::requestData. 

JW,
Please help to verify this issue.

Comment 7

[JW Wang [:jwwang] [:jw_wang]]

It is duplicate of Bug 896353.