[pulseaudio-discuss] [PATCH] loopback: don't reuse low-numbered message IDs

Alexander E. Patrakov patrakov at gmail.com
Mon Feb 16 03:35:11 PST 2015

16.02.2015 15:52, David Henningsson wrote:
> Well, the big issue I guess is that in current state,
> PA_SOURCE_OUTPUT_MESSAGE_GET_LATENCY messages always return 0.
> Maybe there should be a sentence about that, or I could just push it as
> it is. What do you think?

Well, I did not think about the exact message being hidden. I only 
noticed that the enum did not use the = PA_SOURCE_OUTPUT_MESSAGE_MAX. 
But of course, you are right. So here is an alternative commit message, 
please use it if you like it better.

loopback: don't use 0 for custom source output message id

Message id 0 is PA_SOURCE_OUTPUT_MESSAGE_GET_LATENCY. So, every time 
PulseAudio sent PA_SOURCE_OUTPUT_MESSAGE_GET_LATENCY message to the 
loopback source output, it actually hit the 
SOURCE_OUTPUT_MESSAGE_LATENCY_SNAPSHOT handler instead. As a result, the 
intended, the default PA_SOURCE_OUTPUT_MESSAGE_GET_LATENCY handler was 
not called at all, and the latency was thus evaluated incorrectly.

Signed-off-by: Alexander E. Patrakov <patrakov at gmail.com>

Alexander E. Patrakov

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