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Re: Web Audio API sequencer capabilities

From: Chris Rogers <crogers@google.com>
Date: Mon, 8 Oct 2012 18:47:51 -0700
Message-ID: <CA+EzO0kTvZCJn4L-o0CA+_Bo+stS3wMKKFLryu1dOGJTVuGTuQ@mail.gmail.com>
To: Srikumar Karaikudi Subramanian <srikumarks@gmail.com>
Cc: Patrick Borgeat <patrick.borgeat@gmail.com>, Joe Berkovitz <joe@noteflight.com>, Jussi Kalliokoski <jussi.kalliokoski@gmail.com>, "public-audio@w3.org Group" <public-audio@w3.org>
On Mon, Oct 8, 2012 at 4:59 PM, Srikumar Karaikudi Subramanian <
srikumarks@gmail.com> wrote:

>
> On 9 Oct, 2012, at 1:00 AM, Chris Rogers <crogers@google.com> wrote:
>
> On Sat, Oct 6, 2012 at 1:09 AM, Patrick Borgeat <patrick.borgeat@gmail.com
> > wrote:
>
>>
>> Since the GainNode doesn't produce a signal we would need to feed him a
>> Unity signal, but all the possibilities I see in the API would require the
>> developer to specify the lifetime of the unity signal (I think it would be
>> more straightforward for a UnitySourceNode to be collected automatically).
>>
>>
> I think Joe already mentioned this, but if an AudioBufferSourceNode is in
> "loop" mode, then it's not necessary to manage it's lifetime, and it will
> simply play forever until gc.  Also, if an application often needs to deal
> with these "unity sources", then it's pretty easy to just create a single
> one, then share it among any nodes needing it.
>
>
> I'm not sure how the "shared unity source" approach can work in the
> general case. If the singleton source is fed into multiple nodes, and one
> part of this graph is to be trashed, we cannot disconnect only that
> connection. A disconnect() call on the unity source node would disconnect
> all the connections of the shared unity source. If we disconnect only some
> terminal node of subgraph fed by the unity source, then the nodes in that
> subgraph will continue to survive GC if I understand correctly.
>
> The only approach I see is to create separate unity sources for each
> dynamic part of the audio graph that needs one.
>
>
You're right, I was overgeneralizing the usefulness of sharing a single
unity source.  For long-lived parts of the graph they could be used, but
each dynamic part needs its own...

Chris


> Best,
> -Kumar
>
Received on Tuesday, 9 October 2012 01:48:18 UTC

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