AudioFilterFIR_F32.cpp

/*
 * AudioFilterFIR_F32.cpp
 *
 * Chip Audette, OpenAudio, Apr 2017
 *
 * MIT License,  Use at your own risk.
 *
*/

#include "AudioFilterFIR_F32.h"


void AudioFilterFIR_F32::update(void)
{
  audio_block_f32_t *block, *block_new;

  block = AudioStream_F32::receiveReadOnly_f32();
  if (!block) return;

  // If there's no coefficient table, give up.  
  if (coeff_p == NULL) {
    AudioStream_F32::release(block);
    return;
  }

  // do passthru
  if (coeff_p == FIR_F32_PASSTHRU) {
    // Just passthrough
    AudioStream_F32::transmit(block);
    AudioStream_F32::release(block);
	//Serial.println("AudioFilterFIR_F32: update(): PASSTHRU.");
    return;
  }

	// get a block for the FIR output
	block_new = AudioStream_F32::allocate_f32();
	if (block_new) {
		
		//check to make sure our FIR instance has the right size
		if (block->length != configured_block_size) {
			//doesn't match.  re-initialize
			Serial.println("AudioFilterFIR_F32: block size doesn't match.  Re-initializing FIR.");
			begin(coeff_p, n_coeffs, block->length);  //initialize with same coefficients, just a new block length
		}
		
		//apply the FIR
		arm_fir_f32(&fir_inst, block->data, block_new->data, block->length);
		block_new->length = block->length;

		//transmit the data
		AudioStream_F32::transmit(block_new); // send the FIR output
		AudioStream_F32::release(block_new);
	}
	AudioStream_F32::release(block);
}