resample-method в PulseAudio

static pa_resample_method_t choose_auto_resampler(pa_resample_flags_t flags) {
    pa_resample_method_t method;

    if (pa_resample_method_supported(PA_RESAMPLER_SPEEX_FLOAT_BASE + 1))
        method = PA_RESAMPLER_SPEEX_FLOAT_BASE + 1;
    else if (flags & PA_RESAMPLER_VARIABLE_RATE)
        method = PA_RESAMPLER_TRIVIAL;
    else
        method = PA_RESAMPLER_FFMPEG;

    return method;
}

Support for resampler '%s' not compiled in, reverting to 'auto'
Resampler '%s' cannot do variable rate, reverting to resampler 'auto'
The 'peaks' resampler only supports downsampling, reverting to resampler 'auto'

PA_RESAMPLER_AUTO, /* automatic select based on sample format */