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Old 23rd May 2013, 02:10 PM   #21
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They are not my "unreasonable" prerequisites.....They're theirs.
As for me, I'm always trying to figure out a way to do exactly as told and if it's impossible, I move to a "layer down" by giving my customers another "close to this" solution.
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Old 23rd May 2013, 02:13 PM   #22
Julf is offline Julf  Europe
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Quote:
Originally Posted by hipro5 View Post
They are not my "unreasonable" prerequisites.....They're theirs.
As for me, I'm always trying to figure out a way to do exactly as told and if it's impossible, I move to a "layer down" by giving my customers another "close to this" solution.
Right. In this case, the answer is to accept higher latency (at lest the time for packet to time out and be retransmitted) or accept occasional dropouts.
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Old 23rd May 2013, 02:21 PM   #23
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OK.

a. BUT maximum latency must be at least 500ms

b. By the "occasional dropouts" what exactly do you mean?.......A note of an instrament (ex. saxophone) of theirs perhaps - I can't understant it.

Last edited by hipro5; 23rd May 2013 at 02:23 PM.
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Old 23rd May 2013, 02:47 PM   #24
Julf is offline Julf  Europe
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Originally Posted by hipro5 View Post
b. By the "occasional dropouts" what exactly do you mean?.......A note of an instrament (ex. saxophone) of theirs perhaps - I can't understant it.
What happens if the network drops a packet? There are two things you can do. One is to wait for the sender to retransmit the packet (with an adaptive timeout as per RFC793) causing latency, the other is to "fake it" by not producing any sound for the length of the packet. The shorter you make the packet (a 1024 byte packet corresponds to 1 ms at 24 bit 192 KHz stereo), the shorter the possible dropout, but the higher the overhead and the risk of packet loss.

I don't think there is any way to guarantee a 500 ms timeout/retransmit using TCP, so you would have to implement your own acknowledgement/timeout/retransmit protocol on top of UDP.
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Old 23rd May 2013, 03:17 PM   #25
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OK - let's forget the Network and let's suppose that we have an IDIAL network without any dropouts.
From the system we're talking about now, what will be the maximum latency?
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Old 23rd May 2013, 03:20 PM   #26
Julf is offline Julf  Europe
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Originally Posted by hipro5 View Post
OK - let's forget the Network and let's suppose that we have an IDIAL network without any dropouts.
From the system we're talking about now, what will be the maximum latency?
For the pure buffer latency, a 1024 byte packet corresponds to 1 ms at 24 bit 192 KHz stereo. The rest of the latency depends on your hardware and OS.
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Old 23rd May 2013, 03:21 PM   #27
Julf is offline Julf  Europe
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Quote:
Originally Posted by hipro5 View Post
They are not my "unreasonable" prerequisites.....They're theirs.
As for me, I'm always trying to figure out a way to do exactly as told and if it's impossible, I move to a "layer down" by giving my customers another "close to this" solution.
Umh... "Customer"? Is this something you are doing on a commercial basis for a customer?
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Old 23rd May 2013, 03:32 PM   #28
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There are some "crazy" musicians who asked me if I could find a way/someone to do this.
.........and I think that the one who pays me for something, I could call him "customer", No?
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Old 23rd May 2013, 03:34 PM   #29
Julf is offline Julf  Europe
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Originally Posted by hipro5 View Post
There are some "crazy" musicians who asked me if I could find a way/someone to do this.
OK, so you are doing this just to help them, without monetary gain? The word "customer" just sounded odd...
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Old 23rd May 2013, 03:43 PM   #30
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.....yes, I'm a Greek guy and my English are good (I think) but not THAT good!...

For example:

" think the OP needs to go back and tell his musician friends that unless they can find a way to avoid causality and the Nyquist sampling theorem......"

I didn't got it..... I can't "fully" understand with these strange words involved.
Sorry.
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