Re: [LAD] ALSA MIDI latency test results are far away from reality | Linuxaudio.org

Re: [LAD] ALSA MIDI latency test results are far away from reality

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From: Robin Gareus <robin@...>

To: Ralf Mardorf <ralf.mardorf@...>

Cc: 64studio-users <64studio-users@...>, Clemens Ladisch <clemens@...>, 64studio-devel <64studio-devel@...>, Linux-Audio-Dev <linux-audio-dev@...>, qtractor-devel <qtractor-devel@...>

Subject: Re: [LAD] ALSA MIDI latency test results are far away from reality

Date: Wednesday, July 14, 2010 - 3:40 pm

On 07/14/2010 05:27 PM, Ralf Mardorf wrote:

quoted text> On Wed, 2010-07-14 at 17:24 +0200, Ralf Mardorf wrote:

>> On Wed, 2010-07-14 at 17:21 +0200, Ralf Mardorf wrote:

>>> On Wed, 2010-07-14 at 10:53 -0400, Paul Davis wrote:

>>>> On Wed, Jul 14, 2010 at 9:52 AM, Clemens Ladisch  wrote:

>>>>> Is this connection through JACK or through ALSA, i.e., does it show up

>>>>> in the output of "aconnect -l"?  From what I understand, JACK's sample-

>>>>> synchronous timing always adds latency, and might add period-related

>>>>> jitter depending on the implementation.

>>>>

>>>> the good stuff adds 1 JACK period of latency to whatever the ALSA

>

> PPS:

>

> A misunderstanding by me?

>

>>>> sequencer's direct delivery + the driver does, and zero jitter.

>

> Is there JACK MIDI for hw MIDI too, but only for virtual synth?
No, JACK-MIDI is a protocol in software.
There are bridges to hardware which go connect either via ALSA-sequencer

or raw-ALSA interface to the MIDI hardware.
JACKd itself includes those bridges (-Xseq, -Rraw) and there are also

stand-alone apps (fi a2jmidi_bridge, a2jmidid,..) which can do the same.
> - Ralf

quoted text>

> *Offline now*

>

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Messages in current thread:

[LAD] ALSA MIDI latency test results are far away from reality, Ralf Mardorf, (Wed Jul 14, 1:23 pm)

Re: [LAD] ALSA MIDI latency test results are far away from r..., Niels Mayer, (Thu Jul 15, 5:07 pm)

Re: [LAD] ALSA MIDI latency test results are far away from r..., Robin Gareus, (Wed Jul 14, 7:46 pm)

Re: [LAD] ALSA MIDI latency test results are far away from r..., Ralf Mardorf, (Wed Jul 14, 8:32 pm)

Re: [LAD] ALSA MIDI latency test results are far away from r..., Ralf Mardorf, (Wed Jul 14, 8:16 pm)

Re: [LAD] ALSA MIDI latency test results are far away from r..., Ralf Mardorf, (Wed Jul 14, 8:24 pm)

[LAD] Tests directly routing pc's midi-in to midi-out (was: ..., Arnout Engelen, (Wed Jul 14, 5:56 pm)

Re: [LAD] Tests directly routing pc's midi-in to midi-out (w..., Ralf Mardorf, (Wed Jul 14, 6:09 pm)

Re: [LAD] Tests directly routing pc's midi-in to midi-out, Clemens Ladisch, (Thu Jul 15, 6:26 am)

Re: [LAD] Tests directly routing pc's midi-in to midi-out, Ralf Mardorf, (Thu Jul 15, 8:41 am)

Re: [LAD] Tests directly routing pc's midi-in to midi-out, Arnout Engelen, (Thu Jul 15, 9:48 am)

Re: [LAD] Tests directly routing pc's midi-in to midi-out, Ralf Mardorf, (Thu Jul 15, 10:18 am)

Re: [LAD] Tests directly routing pc's midi-in to midi-out, Clemens Ladisch, (Thu Jul 15, 10:55 am)

Re: [LAD] Tests directly routing pc's midi-in to midi-out, Ralf Mardorf, (Thu Jul 15, 11:08 am)

Re: [LAD] Tests directly routing pc's midi-in to midi-out, Robin Gareus, (Thu Jul 15, 11:45 am)

Re: [LAD] Tests directly routing pc's midi-in to midi-out, Clemens Ladisch, (Thu Jul 15, 2:31 pm)

Re: [LAD] Tests directly routing pc's midi-in to midi-out, Ralf Mardorf, (Thu Jul 15, 12:45 pm)

Re: [LAD] Tests directly routing pc's midi-in to midi-out, Robin Gareus, (Thu Jul 15, 1:36 pm)

Re: [LAD] Tests directly routing pc's midi-in to midi-out, Ralf Mardorf, (Thu Jul 15, 10:49 am)

Re: [LAD] Tests directly routing pc's midi-in to midi-out (w..., Arnout Engelen, (Wed Jul 14, 7:37 pm)

Re: [LAD] Tests directly routing pc's midi-in to midi-out (w..., Ralf Mardorf, (Wed Jul 14, 9:21 pm)

Re: [LAD] Tests directly routing pc's midi-in to midi-out (w..., Ralf Mardorf, (Wed Jul 14, 9:29 pm)

Re: [LAD] Tests directly routing pc's midi-in to midi-out (w..., , (Wed Jul 14, 9:43 pm)

Re: [LAD] Tests directly routing pc's midi-in to midi-out (w..., Ralf Mardorf, (Wed Jul 14, 9:55 pm)

Re: [LAD] Tests directly routing pc's midi-in to midi-out (w..., Arnout Engelen, (Thu Jul 15, 6:23 am)

Re: [LAD] Tests directly routing pc's midi-in to midi-out (w..., , (Wed Jul 14, 10:46 pm)

Re: [LAD] Tests directly routing pc's midi-in to midi-out (w..., Ralf Mardorf, (Wed Jul 14, 11:46 pm)

Re: [LAD] Tests directly routing pc's midi-in to midi-out (w..., , (Thu Jul 15, 8:07 am)

Re: [LAD] Tests directly routing pc's midi-in to midi-out (w..., Ralf Mardorf, (Wed Jul 14, 11:15 pm)

Re: [LAD] Tests directly routing pc's midi-in to midi-out (w..., Arnold Krille, (Thu Jul 15, 7:57 am)

Re: [LAD] Tests directly routing pc's midi-in to midi-out (w..., Ralf Mardorf, (Fri Jul 16, 9:26 am)

Re: [LAD] Tests directly routing pc's midi-in to midi-out (w..., Arnold Krille, (Fri Jul 16, 9:47 am)

Re: [LAD] Tests directly routing pc's midi-in to midi-out, Robin Gareus, (Fri Jul 16, 11:26 am)

Re: [LAD] Tests directly routing pc's midi-in to midi-out, Ralf Mardorf, (Fri Jul 16, 11:30 am)

Re: [LAD] Tests directly routing pc's midi-in to midi-out (w..., Ralf Mardorf, (Fri Jul 16, 10:06 am)

Re: [LAD] Tests directly routing pc's midi-in to midi-out (w..., drew Roberts, (Fri Jul 16, 11:02 am)

Re: [LAD] Tests directly routing pc's midi-in to midi-out (w..., Ralf Mardorf, (Fri Jul 16, 11:23 am)

Re: [LAD] Tests directly routing pc's midi-in to midi-out (w..., Arnold Krille, (Fri Jul 16, 10:19 am)

Re: [LAD] Tests directly routing pc's midi-in to midi-out (w..., Ralf Mardorf, (Fri Jul 16, 10:46 am)

Re: [LAD] Tests directly routing pc's midi-in to midi-out (w..., Ralf Mardorf, (Fri Jul 16, 10:50 am)

Re: [LAD] Tests directly routing pc's midi-in to midi-out (w..., , (Thu Jul 15, 7:57 am)

Re: [LAD] ALSA MIDI latency test results are far away from r..., Clemens Ladisch, (Wed Jul 14, 1:52 pm)

Re: [LAD] ALSA MIDI latency test results are far away from r..., Ralf Mardorf, (Wed Jul 14, 3:11 pm)

Re: [LAD] ALSA MIDI latency test results are far away from r..., Paul Davis, (Wed Jul 14, 2:53 pm)

Re: [LAD] ALSA MIDI latency test results are far away from r..., Ralf Mardorf, (Wed Jul 14, 3:21 pm)

Re: [LAD] ALSA MIDI latency test results are far away from r..., Ralf Mardorf, (Wed Jul 14, 3:24 pm)

Re: [LAD] ALSA MIDI latency test results are far away from r..., Ralf Mardorf, (Wed Jul 14, 3:27 pm)

Re: [LAD] ALSA MIDI latency test results are far away from r..., Robin Gareus, (Wed Jul 14, 3:40 pm)

Re: [LAD] ALSA MIDI latency test results are far away from r..., Robin Gareus, (Wed Jul 14, 1:45 pm)

Re: [LAD] ALSA MIDI latency test results are far away from r..., Ralf Mardorf, (Wed Jul 14, 2:22 pm)

Re: [LAD] ALSA MIDI latency test results are far away from r..., Robin Gareus, (Wed Jul 14, 3:31 pm)

Re: [LAD] ALSA MIDI latency test results are far away from r..., Ralf Mardorf, (Wed Jul 14, 5:58 pm)

Re: [LAD] ALSA MIDI latency test results are far away from r..., Robin Gareus, (Wed Jul 14, 7:43 pm)

Re: [LAD] ALSA MIDI latency test results are far away from r..., Ralf Mardorf, (Wed Jul 14, 8:08 pm)