[pulseaudio-discuss] Async API - need some help

[Zeno Endemann]

Tanu Kaskinen wrote on 19.06.2011 12:18:
>> I tried using pa_stream_begin_write, but it always returns a nullpointer
>> there...
> 
> It shouldn't return a null pointer. Check the error code.
Nevermind, I made the mistake to set nbytes to 0 instead of (size_t)-1.
pa_stream_begin_write works fine now.

Anyway, no matter what I choose for the offset, I still get always
underruns and bad latencies when rewriting buffers like this:
  int tmpOff = 10000; // also tried: 0, 100, -100, -10000
  int16_t *tmpBuf = 0;
  size_t n = (size_t) -1;
  pa_stream_begin_write(cs->pa_Strm, (void **)&tmpBuf, &n);
  writeToneToBuffer(tmpBuf, n/4, cs);
  pa_stream_write(cs->pa_Strm, tmpBuf, 4*(n/4), 0, tmpOff,
PA_SEEK_RELATIVE_ON_READ );

I've uploaded the latest version:
http://www2.informatik.hu-berlin.de/~endemann/PulseStress_0.2.tar.bz2

Zeno