Linear Resampler

sherpa-onnx provides a linear resampler for sample rate conversion through the SherpaOnnxCreateLinearResampler() API.

See also

SherpaOnnxCreateLinearResampler, SherpaOnnxDestroyLinearResampler

const SherpaOnnxLinearResampler *resampler =
    SherpaOnnxCreateLinearResampler(48000, 16000, 0, 0);
 
// Process intermediate chunks (flush = 0)
const SherpaOnnxResampleOut *out =
    SherpaOnnxLinearResamplerResample(resampler, input_samples, n, 0);
// Use out->samples[0..out->n-1]
SherpaOnnxLinearResamplerResampleFree(out);
 
// Flush the final chunk (flush = 1)
out = SherpaOnnxLinearResamplerResample(resampler, last_chunk, last_n, 1);
SherpaOnnxLinearResamplerResampleFree(out);
 
SherpaOnnxDestroyLinearResampler(resampler);

If filter_cutoff_hz or num_zeros is 0, default values are used:

float min_freq = samp_rate_in_hz < samp_rate_out_hz ? samp_rate_in_hz
                                                     : samp_rate_out_hz;
float filter_cutoff_hz = 0.99f * 0.5f * min_freq;
int32_t num_zeros = 6;