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Leave some notes about downsampling.

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Themaister 2012-10-16 10:45:46 +02:00
parent ff914dd862
commit d027287d71
1 changed files with 3 additions and 0 deletions
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audio/sinc.c
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@ -230,6 +230,9 @@ static void process_sinc(rarch_resampler_t *resamp, float *out_buffer)
void resampler_process(rarch_resampler_t *re, struct resampler_data *data) void resampler_process(rarch_resampler_t *re, struct resampler_data *data)
{ {
// If data->ratio is < 1, we are downsampling.
// The sinc table is not set up for this, as it always assumes upsampling.
// Downsampling will work, but with some added noise due to aliasing might be present.
uint32_t ratio = PHASES_WRAP / data->ratio; uint32_t ratio = PHASES_WRAP / data->ratio;
const sample_t *input = data->data_in; const sample_t *input = data->data_in;