sw_codec_select.h

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/*
 * Copyright (c) 2018 Nordic Semiconductor ASA
 *
 * SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
 */
 
#ifndef _SW_CODEC_SELECT_H_
#define _SW_CODEC_SELECT_H_
 
#include <zephyr/kernel.h>
#include "channel_assignment.h"
 
#if (CONFIG_SW_CODEC_LC3)
#define LC3_MAX_FRAME_SIZE_MS   10
#define LC3_ENC_MONO_FRAME_SIZE (CONFIG_LC3_BITRATE_MAX * LC3_MAX_FRAME_SIZE_MS / (8 * 1000))
 
#define LC3_PCM_NUM_BYTES_MONO                                                                     \
        (CONFIG_AUDIO_SAMPLE_RATE_HZ * CONFIG_AUDIO_BIT_DEPTH_OCTETS * LC3_MAX_FRAME_SIZE_MS / 1000)
#define LC3_ENC_TIME_US 3000
#define LC3_DEC_TIME_US 1500
#else
#define LC3_ENC_MONO_FRAME_SIZE 0
#define LC3_PCM_NUM_BYTES_MONO  0
#define LC3_ENC_TIME_US         0
#define LC3_DEC_TIME_US         0
#endif /* CONFIG_SW_CODEC_LC3 */
 
/* Max will be used when multiple codecs are supported */
#define ENC_MAX_FRAME_SIZE   MAX(LC3_ENC_MONO_FRAME_SIZE, 0)
#define ENC_TIME_US          MAX(LC3_ENC_TIME_US, 0)
#define DEC_TIME_US          MAX(LC3_DEC_TIME_US, 0)
#define PCM_NUM_BYTES_MONO   MAX(LC3_PCM_NUM_BYTES_MONO, 0)
#define PCM_NUM_BYTES_STEREO (PCM_NUM_BYTES_MONO * 2)
 
enum sw_codec_select {
        SW_CODEC_NONE,
        SW_CODEC_LC3, /* Low Complexity Communication Codec */
};
 
enum sw_codec_channel_mode {
        SW_CODEC_MONO = 1,
        SW_CODEC_STEREO,
};
 
struct sw_codec_encoder {
        bool enabled;
        int bitrate;
        enum sw_codec_channel_mode channel_mode;
        uint8_t num_ch;
        enum audio_channel audio_ch;
        uint32_t sample_rate_hz;
};
 
struct sw_codec_decoder {
        bool enabled;
        enum sw_codec_channel_mode channel_mode; /* Mono or stereo. */
        uint8_t num_ch;                          /* Number of decoder channels. */
        enum audio_channel audio_ch;             /* Used to choose which channel to use. */
        uint32_t sample_rate_hz;
};
 
struct sw_codec_config {
        enum sw_codec_select sw_codec;   /* sw_codec to be used, e.g. LC3, etc. */
        struct sw_codec_decoder decoder; /* Struct containing settings for decoder. */
        struct sw_codec_encoder encoder; /* Struct containing settings for encoder. */
        bool initialized;                /* Status of codec. */
};
 
bool sw_codec_is_initialized(void);
 
int sw_codec_encode(void *pcm_data, size_t pcm_size, uint8_t **encoded_data, size_t *encoded_size);
 
int sw_codec_decode(uint8_t const *const encoded_data, size_t encoded_size, bool bad_frame,
                    void **pcm_data, size_t *pcm_size);
 
int sw_codec_uninit(struct sw_codec_config sw_codec_cfg);
 
int sw_codec_init(struct sw_codec_config sw_codec_cfg);
 
#endif /* _SW_CODEC_SELECT_H_ */