[haiku-development] Re: Multi Audio Specification
- From: Ingo Weinhold <ingo_weinhold@xxxxxx>
- To: haiku-development@xxxxxxxxxxxxx
- Date: Sun, 13 Dec 2009 13:48:33 +0100
On 2009-12-13 at 13:14:11 [+0100], Jérôme Duval <korli@xxxxxxxxxxxxxxxx>
wrote:
> 2009/12/13 Ingo Weinhold <ingo_weinhold@xxxxxx>:
> > just a quick question: Is there a specification for the multi audio
> > protocol? Besides the header, that is.
>
> The usual answer: I'm afraid no spec documentation is available,
> reading the sources might help.
That's kind of a problem, since I want to check the sources (the
MultiAudioNode and hda driver) against the specs.
> A newsletter was written at Be, no real specification though:
> http://www.haiku-os.org/legacy-docs/benewsletter/Issue5-1.html
The article refers to the documents multi_audio.gb and multi_audio.txt as
the '"complete" documentation'. Does anyone have these files?
> Better ask questions here :)
I'm primarily interested in the exact semantics of the
B_MULTI_BUFFER_EXCHANGE call. Particularly whether indeed all fields of
multi_buffer_info structure are output parameters -- the doxygen comment at
the HDA driver's buffer_exchange() function suggests that
playback_buffer_cycle isn't, but it still completely ignores it -- and what
the call is supposed to be waiting for -- the end of the currently played
buffer or shall it indeed return immediately (with incorrect return
values), if B_MULTI_BUFFER_EXCHANGE wasn't called for a previous buffer, as
the HDA driver does.
CU, Ingo
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