How does MPD handle ALSA?

[LarsGrootkarzijn]

Hello all,

I have a custom ALSA-lib for my device to handle my soundcard correctly. Now, this lib does not work with MPD at the moment. When playbacking music via MPD how does this get handled? It seems like MPD never sends a command to alsa-lib to change the bitrate. Usually there would be a call to snd_pcm_hw_param_set() to change the bitrate. For example when 44.1khz this function would get called with 44100. However, MPD does not seem to do this. Is this correct?

[MaxKellermann]

You mean sample rate, not bit rate?

Usually there would be a call to snd_pcm_hw_param_set() to change the bitrate.

[quotation needed]

And here's my quotation right from the MPD source code:

MPD/src/lib/alsa/HwSetup.cxx

Lines 203 to 204 in 99885c4

	err = snd_pcm_hw_params_set_rate_near(pcm, hwparams,
	&output_sample_rate, nullptr);

This call has been working fine for MPD for the last 20 years.

[LarsGrootkarzijn]

Hi, I indeed did mean sample rate.
Thank you for you answer, I will probably change alsalib a bit more to work with snd_pcm_hw_params_set_rate_near aswell. Thank you.