#ifndef _AUDIO_HW_H
#define _AUDIO_HW_H

#include <stdint.h>

#include "co_list.h"

typedef void (*audio_hw_request_pcm_t)(void *pcm, uint32_t samples, uint8_t channels);
typedef void (*audio_hw_receive_pcm_ntf_t)(uint32_t samples);

typedef enum {
    AUDIO_HW_TYPE_I2S,
    AUDIO_HW_TYPE_CODEC,
    AUDIO_HW_TYPE_PDM,
} audio_hw_type_t;

typedef enum {
    AUDIO_HW_DIR_IN = 0x01,
    AUDIO_HW_DIR_OUT = 0x02,
    AUDIO_HW_DIR_INOUT = (AUDIO_HW_DIR_IN | AUDIO_HW_DIR_OUT),
} audio_hw_dir_t;

typedef struct {
    struct co_list_hdr hdr;

    audio_hw_type_t type;
    audio_hw_dir_t dir;
    uint8_t channels;
    uint32_t sample_rate;
    uint32_t base_addr;
    void *hw_handle;

    /* used for output mode */
    audio_hw_request_pcm_t request_handler;
    int16_t *pcm_out;

    /* used for input mode */
    uint32_t wr_ptr;        /* unit is sample */
    struct co_list output_list;
    uint32_t pcm_samples;   /* unit is sample */
    uint8_t *pcm;
} audio_hw_t;

typedef struct {
    struct co_list_hdr hdr;
    
    audio_hw_t *audio_hw;
    audio_hw_receive_pcm_ntf_t handler;
    uint32_t rd_ptr;    /* unit is sample */
} audio_hw_output_t;

audio_hw_t *audio_hw_create(audio_hw_type_t type, audio_hw_request_pcm_t handler, uint32_t base_addr, audio_hw_dir_t dir, uint32_t sample_rate, uint8_t channels);

void audio_hw_destroy(audio_hw_t *hw);

audio_hw_output_t *audio_hw_output_add(audio_hw_t *hw, audio_hw_receive_pcm_ntf_t handler);

void audio_hw_output_remove(audio_hw_t *hw, audio_hw_output_t *output);

uint32_t audio_hw_read_pcm(audio_hw_output_t *output, void *pcm, uint32_t samples, uint8_t channels);

#endif  // _AUDIO_HW_H