Bluetooth LE Stack
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Outline
#define BTSTACK_LC3_H
#include <stdint.h>
btstack_lc3_frame_duration_t
btstack_lc3_decoder_t
btstack_lc3_encoder_t
btstack_lc3_frame_duration_in_us(btstack_lc3_frame_duration_t);
btstack_lc3_samples_per_frame(uint32_t, btstack_lc3_frame_duration_t);
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SourceVuRaspberry Pi Pico SDK and ExamplesBluetooth LE Stacksrc/btstack_lc3.h
 
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/* * Copyright (C) 2022 BlueKitchen GmbH * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the copyright holders nor the names of * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BLUEKITCHEN * GMBH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * *//* ... */ /** * @title LC3 Interface * * Interface for LC3 implementations * *//* ... */ #ifndef BTSTACK_LC3_H #define BTSTACK_LC3_H #include <stdint.h> #if defined __cplusplus extern "C" { #endif /* API_START */ typedef enum { BTSTACK_LC3_FRAME_DURATION_10000US, BTSTACK_LC3_FRAME_DURATION_7500US ...} btstack_lc3_frame_duration_t; typedef struct { /** * Configure Decoder * @param context * @param sample_rate * @param frame_duration * @param octets_per_frame * @return status *//* ... */ uint8_t (*configure)(void * context, uint32_t sample_rate, btstack_lc3_frame_duration_t frame_duration, uint16_t octets_per_frame); /** * Decode LC3 Frame into signed 16-bit samples * @param context * @param bytes * @param BFI Bad Frame Indication flags * @param pcm_out buffer for decoded PCM samples * @param stride count between two consecutive samples * @param BEC_detect Bit Error Detected flag * @return status *//* ... */ uint8_t (*decode_signed_16)(void * context, const uint8_t *bytes, uint8_t BFI, int16_t* pcm_out, uint16_t stride, uint8_t * BEC_detect); /** * Decode LC3 Frame into signed 24-bit samples, sign-extended to 32-bit * @param context * @param bytes * @param BFI Bad Frame Indication flags * @param pcm_out buffer for decoded PCM samples * @param stride count between two consecutive samples * @param BEC_detect Bit Error Detected flag * @return status *//* ... */ uint8_t (*decode_signed_24)(void * context, const uint8_t *bytes, uint8_t BFI, int32_t* pcm_out, uint16_t stride, uint8_t * BEC_detect); ...} btstack_lc3_decoder_t; typedef struct { /** * Configure Decoder * @param context * @param sample_rate * @param frame_duration * @param octets_per_frame * @return status *//* ... */ uint8_t (*configure)(void * context, uint32_t sample_rate, btstack_lc3_frame_duration_t frame_duration, uint16_t octets_per_frame); /** * Encode LC3 Frame with 16-bit signed PCM samples * @param context * @param pcm_in buffer for decoded PCM samples * @param stride count between two consecutive samples * @param bytes * @return status *//* ... */ uint8_t (*encode_signed_16)(void * context, const int16_t* pcm_in, uint16_t stride, uint8_t *bytes); /** * Encode LC3 Frame with 24-bit signed PCM samples, sign-extended to 32 bit * @param context * @param pcm_in buffer for decoded PCM samples * @param stride count between two consecutive samples * @param bytes * @return status *//* ... */ uint8_t (*encode_signed_24)(void * context, const int32_t* pcm_in, uint16_t stride, uint8_t *bytes); ...} btstack_lc3_encoder_t; /** * @brief Map enum to ISO Interval in us * @param frame_duration enum * @return frame_duratoin in us or 0 for invalid frame_duration enum *//* ... */ uint16_t btstack_lc3_frame_duration_in_us(btstack_lc3_frame_duration_t frame_duration); /** * @bbrief Calculate number of samples per ISO Interval * @param sample_rate * @param frame_duration * @return *//* ... */ uint16_t btstack_lc3_samples_per_frame(uint32_t sample_rate, btstack_lc3_frame_duration_t frame_duration); /* API_END */ #if defined __cplusplus }extern "C" { ... } #endif/* ... */ #endif // LC3_H
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