| Hi Michael:
I'm sorry, this is confusing:
"Employing the ALSA plugin layer works well with either -odac:plughw:0 or -odac:plughw:2."
I meant using plughw with -+rtaudio=portaudio.
Best,
dp
gogins@pipeline.com wrote:
>OK, I thought you got good latency with PortAudio using -odac:plughw, but
>you are saying that it was bad with PortAudio but good with ALSA native. It
>used to be good with PortAudio using -odac:plughw, and then for a while it
>was good with just PortAudio -odac 1 or 2 or whatever. Needs more
>investigation.
>
>
>Original Message:
>-----------------
>From: Dave Phillips dlphilp@bright.net
>Date: Fri, 18 Feb 2005 10:52:15 -0500
>To: csound-devel@lists.sourceforge.net
>Subject: Re: [Cs-dev] MME rtaudio plugin for Win32
>
>
>Hi Michael:
>
> If the latency from PortAudio is simply unavoidable when using its own
>device selection, then yes, it should be documented with the preferable
>device selection. Btw, I also tried these settings with -+rtaudio=pa :
>
> -odac:hw:2 - failed with this error again (same error with -odac2) :
>
> Using Portaudio output device hw:2.
> Suggested PortAudio output latency = 0.000000 seconds.
> paBlockingWriteOpen: nchnls 2 sr 44100.000000 buffer frames 1024
>device -2
> paBlockingWriteOpen returned -9998.
> PortAudio error -9998: Invalid number of channels.
> Failed to initialise real time audio output
>
> -odac:hw:0 - worked well, negligible latency
>
>So to further summarize:
>
> Using -+rtaudio=pa fails with either -odac2 or -odac:hw:2. RT
>performance is poor with -odac0, but good with -odac:hw:0. Employing the
>ALSA plugin layer works well with either -odac:plughw:0 or -odac:plughw:2.
>
> These results come from the simple midi-in test file I posted a few
>days ago. Device 0 is my SBLive, device 2 is my Delta 66. My device 1 is
>the ALSA virtual MIDI device and is not used in these tests.
>
>Best regards,
>
>dp
>
>
>
>gogins@pipeline.com wrote:
>
>
>
>>Yes, that's what I was working for, and it is the same as my experience.
>>This seems quite usable to me as long as the right argument for -dac is
>>used.
>>
>>Would you consider the argument issue to be a bug that needs to be fixed,
>>or is it sufficient to document it?
>>
>>Thanks again.
>>
>>Original Message:
>>-----------------
>>From: Dave Phillips dlphilp@bright.net
>>Date: Fri, 18 Feb 2005 09:00:13 -0500
>>To: csound-devel@lists.sourceforge.net
>>Subject: Re: [Cs-dev] MME rtaudio plugin for Win32
>>
>>
>>Michael Gogins wrote:
>>
>>
>>
>>
>>
>>>The blocking API is not usable, at least not six months ago last time
>>>I tried on Linux, that is why pa_blocking.c exists.
>>>
>>>Art, Dave, can you repeat your findings for me?
>>>
>>>
>>>
>>>
>>Hi Michael:
>>
>> I sent the results of my PortAudio tests to the list yesterday, I
>>assume you saw them. Is that what you're looking for ?
>>
>> To summarize: When using -+rtaudio=pa I get the following results from
>>my output device selections (when using the midi-in.csd test) :
>>
>> -dac2 (Delta66) - Csound aborts with an error regarding the number
>>of channels reported by PA
>> -dac0 (SBLive) - Csound plays, but latency is atrocious, on the
>>order of 1 second delay between keypress and sound
>> -dac:plughw:2 - Csound plays, latency is unnoticeable
>> -dac:plughw:0 - ditto
>>
>>Best regards,
>>
>>dp
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
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