[alsa-devel] Conversion to int16_t and resolution loss with rate converter plugins

[Pavel Hofman]

Dne 5.4.2018 v 23:21 Flavio Protasio Ribeiro napsal(a):
> Hi Pavel,
> 
> Thanks for the reference to your previous discussion and the patches.
> They were super helpful. As you can see from my reply to Takashi, I'm
> proposing adding a convert_s32 method that doesn't impose dependency
> on a HW FPU on alsa-lib. The convert_s32 method would operate on an
> array of int32's.
> 
> From the point of view of the plugin developer, the change from
> convert_s16 to convert_s32 is pretty trivial. The plugins that I
> personally care about operate internally with floats. The plugin
> would remain responsible for converting between int32 and float.

Sounds much better than my attempt at float API.
> 
> I agree that a libsoxr plugin would be great. Getting higher quality
> real-time resampling is my ultimate goal :)

If you make it work, you will be praised by countless users :-)

But the existing rate API will have to be modified since libsoxr behaves 
a bit different to speex or libresample - see the library author 
discussing the issues 
http://mailman.alsa-project.org/pipermail/alsa-devel/2013-September/066764.html

Thanks,

Pavel.