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Decimation wins for better speed with accuracy

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Troy
2024-03-04 10:19:58 -05:00
parent ed897968b9
commit 639e911e4b
1 changed files with 6 additions and 9 deletions
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15
usermods/audioreactive/audio_source.h
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@@ -359,13 +359,13 @@ class I2SSource : public AudioSource {
memset(buffer, 0, sizeof(float) * num_samples); // clear output buffer
I2S_datatype *newSamples = newSampleBuffer; // use global input buffer
I2S_datatype *newSamples4x = newSampleBuffer4x; // use oversampling global input buffer
I2S_datatype *newSamples_buff = newSampleBuffer4x; // use oversampling global input buffer
if (num_samples > I2S_SAMPLES_MAX) num_samples = I2S_SAMPLES_MAX; // protect the buffer from overflow
if (_sampleRate == 96000) {
num_samples *= 4;
err = i2s_read(I2S_NUM_0, (void *)newSamples4x, num_samples * sizeof(I2S_datatype), &bytes_read, portMAX_DELAY);
err = i2s_read(I2S_NUM_0, (void *)newSamples_buff, num_samples * sizeof(I2S_datatype), &bytes_read, portMAX_DELAY);
} else {
err = i2s_read(I2S_NUM_0, (void *)newSamples, num_samples * sizeof(I2S_datatype), &bytes_read, portMAX_DELAY);
}
@@ -382,13 +382,10 @@ class I2SSource : public AudioSource {
}
if (_sampleRate == 96000) {
for (int i = 0; i < num_samples/4; i++) {
// Code for averaging. Decimation seems fine too.
// newSamples[i] = 0;
// for (int x = 0; x < 4; x++) {
// newSamples[i] += newSamples4x[(i*4)+x]/4;
// }
newSamples[i] = newSamples4x[(i*4)]; // every 4th sample, skip the rest.
int current = 0;
for (int i = 0; i < 2048; i += 4) {
newSamples[current] = newSamples_buff[i];
current++;
}
num_samples /= 4; // back to 512 samples
}