lc3_file.h

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/*
 * Copyright (c) 2024 Nordic Semiconductor ASA
 *
 * SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
 */
 
#ifndef LC3_FILE_H__
#define LC3_FILE_H__
 
#include <stddef.h>
#include <stdint.h>
 
#include <zephyr/fs/fs.h>
#include <zephyr/sys/util.h>
 
struct lc3_file_header {
        uint16_t file_id;        /* Constant value, 0xCC1C */
        uint16_t hdr_size;       /* Header size, 0x0012 */
        uint16_t sample_rate;    /* Sample frequency / 100 */
        uint16_t bit_rate;       /* Bit rate / 100 (total for all channels) */
        uint16_t channels;       /* Number of channels */
        uint16_t frame_duration; /* Frame duration in ms * 100 */
        uint16_t rfu;            /* Reserved for future use */
        uint16_t signal_len_lsb; /* Number of samples in signal, 16 LSB */
        uint16_t signal_len_msb; /* Number of samples in signal, 16 MSB (>> 16) */
} __packed;
 
struct lc3_file_ctx {
        struct fs_file_t file_object;
        struct lc3_file_header lc3_header;
        uint32_t number_of_samples;
};
 
int lc3_header_get(struct lc3_file_ctx const *const file, struct lc3_file_header *header);
 
int lc3_file_frame_get(struct lc3_file_ctx *file, uint8_t *buffer, size_t buffer_size);
 
int lc3_file_open(struct lc3_file_ctx *file, const char *file_name);
 
int lc3_file_close(struct lc3_file_ctx *file);
 
int lc3_file_init(void);
 
#endif /* LC3_FILE_H__ */