[alsa-devel] pointer callback question

Tim Blechmann tim at klingt.org
Thu Feb 12 18:50:45 CET 2009

hi all,

one question about the pointer callback.

the docs say:
>  This callback is called when the PCM middle layer inquires the current
>  hardware position on the buffer. The position must be returned in
>  ranging from 0 to buffer_size - 1.

i am using a ringbuffer to communicate with my audio device. but when
the position is reset to 0, alsa requests to stop the stream

the brief log is (4 periods of 64 frames):
stream_pointer at 64
stream_pointer at 128
stream_pointer at 192
stream_pointer at 256
stream_pointer at 0

after returning 0, a stop is requested.

am i missing something?
thanks, tim

tim at klingt.org

Contrary to general belief, an artist is never ahead of his time but
most people are far behind theirs.
  Edgar Varèse

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