983058 - Write a WPT that tests the a MediaElementAudioSourceNode has the same number of channels as the original HTMLMediaElement

Status: NEW

(Core :: Web Audio, defect, P4)

Description

[Karl Tomlinson (:karlt)]

"The first AudioMediaStreamTrack from the MediaStream will be used as a source of audio."

"The number of channels of the output corresponds to the number of channels of the AudioMediaStreamTrack."

Currently all audio unblocked tracks are mixed, and the channel count is the union of channel counts from all tracks.

Perhaps it makes sense to use all the enabled (not blocked?) tracks, and the Web Audio spec could be changed.

Comment 1

[Maire Reavy [:mreavy]]

Paul -- is this still valid?  And if so, should the spec be updated, or should we modify our implementation to match the spec?

Also, what should be the priority of this?

Thanks

Comment 2

[Paul Adenot (:padenot)]

We talked about it at a spec level, we've agreed what to do, but we haven't written the text yet, and the solution was a bit weird.

https://github.com/WebAudio/web-audio-api/issues/132

Comment 3

[Paul Adenot (:padenot)]

P2 I guess. There are more important things to work on, but since we are implementing (or have implemented) related APIs (MediaStream ctor, AddTrack, etc.), it makes sense to have this up to date per spec.

Comment 4

[Bulk Bug Changes for mreavy's org]

Mass change P3->P4 to align with new Mozilla triage process.

Comment 5

[Paul Adenot (:padenot)]

We now doing the right thing, but it would be good to have a WPT that tests it.

Comment 6

[Paul Adenot (:padenot)]

It will be easy to write a test for this when AudioWorklet is finished: it makes it easy to inspect the number of channel of an input.