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56 lines
1.4 KiB
56 lines
1.4 KiB
8 years ago
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/*
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* AudioFilterFIR_F32.cpp
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*
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* Chip Audette, OpenAudio, Apr 2017
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*
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* MIT License, Use at your own risk.
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*
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*/
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#include "AudioFilterFIR_F32.h"
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void AudioFilterFIR_F32::update(void)
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{
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audio_block_f32_t *block, *block_new;
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block = AudioStream_F32::receiveReadOnly_f32();
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if (!block) return;
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// If there's no coefficient table, give up.
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if (coeff_p == NULL) {
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AudioStream_F32::release(block);
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return;
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}
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// do passthru
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if (coeff_p == FIR_F32_PASSTHRU) {
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// Just passthrough
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AudioStream_F32::transmit(block);
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AudioStream_F32::release(block);
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//Serial.println("AudioFilterFIR_F32: update(): PASSTHRU.");
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return;
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}
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// get a block for the FIR output
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block_new = AudioStream_F32::allocate_f32();
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if (block_new) {
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//check to make sure our FIR instance has the right size
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if (block->length != configured_block_size) {
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//doesn't match. re-initialize
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Serial.println("AudioFilterFIR_F32: block size doesn't match. Re-initializing FIR.");
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begin(coeff_p, n_coeffs, block->length); //initialize with same coefficients, just a new block length
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}
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//apply the FIR
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arm_fir_f32(&fir_inst, block->data, block_new->data, block->length);
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block_new->length = block->length;
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//transmit the data
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AudioStream_F32::transmit(block_new); // send the FIR output
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AudioStream_F32::release(block_new);
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}
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AudioStream_F32::release(block);
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}
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