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27 lines
872 B
27 lines
872 B
/*
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* AudioFilterBiquad_F32.cpp
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*
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* Chip Audette, OpenAudio, Apr 2017
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* MIT License, Use at your own risk.
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*
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* This filter has been running in F32 as a single stage. This
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* would work by using multiple instantations, but compute time and
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* latency suffer. So, Feb 2021 convert to MAX_STAGES 4 as is the I16
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* Teensy Audio library. Bob Larkin
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*
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* See AudioFilterBiquad_F32.h for more notes.
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*/
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#include "AudioFilterBiquad_F32.h"
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void AudioFilterBiquad_F32::update(void) {
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audio_block_f32_t *block;
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block = AudioStream_F32::receiveWritable_f32();
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if (!block) return; // Out of memory
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if(doBiquad) // Filter is defined, so go to it
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arm_biquad_cascade_df1_f32(&iir_inst, block->data,
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block->data, block->length);
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// Transmit the data, filtered or unfiltered
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AudioStream_F32::transmit(block);
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AudioStream_F32::release(block);
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}
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