Audio clock / timestamps drift issue with internet streams

[Christophe Dongieux]

Hi,

I'm running gstreamer on a device that is not a PC, and after some tests,
it appears that the audio clock on this device is slower than it should be.
The test to reveal this was to take an audio file and start playing it on
both the device and a PC: the file is about 1 hour long, and at the end of
it, there was about 1min30sec difference between the time the file ended on
the device and on the PC (yeah, big drift!).

In the case of a local file playing, this is not a big deal to be a little
slower. But in the case of a live playing (in my case MMS radio), there is
a drift between the internet stream time and alsasink (local) time, so
alsasink starts complaining after about an hour with audio cuts and this
message: "Unexpected discontinuity in audio timestamps of more than half a
second".

There are 2 aproaches to deal with this problem: understand and fix the
audio clock rate, or make some tricks in gstreamer/alsasink to avoid the
drift.
In the case I can't find out the audio clock rate fix, do you have any idea
what would be the tricks to make internet radios play fine and long on my
device?

I saw in alsasink plenty of properties that are related to the clock, but
it is not really clear for me what could help me (documentation does not
help me so much).

Thanks in advance,
Christophe Dongieux.
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