I would like to ask if it is possible to resample, i.e. downsample or upsample in rx and tx direction.What is the system call which does this resampling. I am using RDK linux, ALSA driver with DM8168,
Neither the hardware nor the kernel driver are capable of resampling.
If your userspace accesses the device through alsa-lib, you can use its software resampler.
In reply to Clemens Ladisch:
I see that the application uses API which are probably alsa-lib. I understand that I can now downsample or upsample using the library, though I did not yet find the API for that.
In reply to Ran Shalit:
Resampling is automatically enabled if you use a device name like "default" or "plughw". "hw" would bypass all alsa-lib enhancements.
Thank you very much for the answers.In my case device nsame is "plughw" so I see that resampling is automatically enabled, but is there an API for changing the input rate or changing the playback sampling rate ?Can it be change to any value ?
The "plughw" device behaves like a device that supports all sample rates.
To change the input rate, just use another rate.
The playback sample rate is the nearest rate actually supported by the hardware.
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