// This file is part of the CircuitPython project: https://circuitpython.org

//

// SPDX-FileCopyrightText: Copyright (c) 2024 Cooper Dalrymple

//

// SPDX-License-Identifier: MIT

#pragma once

#include "py/obj.h"

#include "shared-bindings/synthio/Biquad.h"

#include "shared-module/audiocore/__init__.h"

#include "shared-module/synthio/__init__.h"

#include "shared-module/synthio/block.h"

#include "shared-module/synthio/Biquad.h"

extern const mp_obj_type_t audiofilters_filter_type;

typedef struct {

audiosample_base_t base;

mp_obj_t filter;

synthio_block_slot_t mix;

mp_obj_t *filter_objs;

size_t filter_objs_len;

biquad_filter_state *filter_states;

int8_t *buffer[2];

uint8_t last_buf_idx;

uint32_t buffer_len; // max buffer in bytes

uint8_t *sample_remaining_buffer;

uint32_t sample_buffer_length;

int32_t *filter_buffer;

bool loop;

bool more_data;

mp_obj_t sample;

} audiofilters_filter_obj_t;

void audiofilters_filter_reset_buffer(audiofilters_filter_obj_t *self,

bool single_channel_output,

uint8_t channel);

audioio_get_buffer_result_t audiofilters_filter_get_buffer(audiofilters_filter_obj_t *self,

bool single_channel_output,

uint8_t channel,

uint8_t **buffer,

uint32_t *buffer_length); // length in bytes