c - Correctly sizing Alsa buffers, weird API -

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I am currently working on a project for which I have to do some sample with Alsa. I am trying to configure, but how am I determining my reading size correctly?

There are two priorities which are interesting to my work: 

  The name of the first one tells that the output will be a period of time for a sample period, although it is weird: If I am setting sample rate on  F = 44100Hz  should be in the sample duration (in nanosecond)  T0 = 1e 9/44100 ~ = 22676 ns  while the function answers  T1 = 725 us = 725000 ns . 
 
 In the meantime, even I have been asked to use non-locking primitives, even if I am trying to lock the 'readi' time profile, and this It is known that for the sample  T2 = 8028603 ns  in the worst case and  T3 = 12436217 ns  in the worst case. 
 
 In the end, I do not know what it means to the following two: 
 
  snd_pcm_hw_par Ams_get_buffer_time snd_pcm_hw_params_get_period_size  
 
 I buffer in time and How to measure the duration of the shape, however, returns the same value as  get_buffer_size , while the latter returns any value like  get_period_time . 
 
 Any hint?

  • Frames: Samples x channels (ie: stereo frames made of two samples Mono Frame is composed of 1 sample, ...)
  • Duration: The number of samples that are transmitted, after which the device accepts transfer to application (usually through a barrier).

* _size function returns the frames in the frame.

HH


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