Thanks again Clemens,
I did it with success (moving the pointer with arithmetic forward after
each periodsize in the big buffer). Now I have a do-while loop with
select. Now a (I hope ...) last question:
To get the tcp-commands for stop/pause:
1.) Do I have to adapt the tcp-commands inside this loop or...
2.) Do I have to work with any poll descriptors (which?)
Best regards
Thomas
Am 13.08.2017 um 19:46 schrieb Clemens Ladisch:
ThomasJF wrote:
I have read a file to buffer with "allframes".
1.) Do I use snd_pcm_writei(...) with a size of "allframes" or loop it
with smaller packages (periodsize)
In blocking mode, the call would be able to write all bytes, eventually.
But in non-blocking mode, it is never possible to write more than the
buffer size immediately. So if you try with more frames, the function
will write as much as it can, and you have to retry with the remaining
frames later anyway.
2.) What are the actual functions to get the interrupt and send the
frames needed into the ringbuffer (standard I/O or select)?
The snd_pcm_writei() call sends the frames to the buffer. The
notification that the device is ready (i.e., that there is enough free
space in the buffer to write more samples) comes through any of the
file-handle-waiting functions (select, poll, epoll).
Regards,
Clemens
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