Use of snd_pcm_format_set_silence

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Hello,

I have an application where in I need to silence the first few samples of
the buffer that is read from snd_pcm_readi(). In order to do this, I call
the snd_pcm_format_set_silence() providing the same buffer that the
snd_pcm_readi() reads to.

1) By doing this, is there going to be a timing delay due to the use of
snd_pcm_format_set_silence()?
2) Is snd_pcm_format_set_silence() the correct function to achieve this
goal or are there better methods?
Please do let me know.

Thank you,
Ankhit
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