kopia lustrzana https://github.com/espressif/esp-idf
84 wiersze
2.3 KiB
C
84 wiersze
2.3 KiB
C
/*
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* SPDX-FileCopyrightText: 2015-2021 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#ifndef _SBC_PLC_H
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#define _SBC_PLC_H
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#include <stdint.h>
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#if defined __cplusplus
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extern "C" {
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#endif
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/* Paramter for PLC (16 kHZ)*/
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#define SBC_FS 120 /* SBC Frame Size */
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#define SBC_N 256 /* 16ms - Window Length for pattern matching */
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#define SBC_M 64 /* 4ms - Template for matching */
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#define SBC_LHIST (SBC_N + SBC_FS - 1) /* Length of history buffer required */
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#define SBC_RT 36 /* SBC Reconvergence Time (samples) */
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#define SBC_OLAL 16 /* OverLap-Add Length (samples) */
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/* PLC State Information */
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typedef struct sbc_plc_state {
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int16_t hist[SBC_LHIST + SBC_FS + SBC_RT + SBC_OLAL];
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int16_t bestlag;
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int nbf;
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} sbc_plc_state_t;
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/* Prototypes */
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/**
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* Perform PLC initialization of memory vectors.
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*
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* @param plc_state pointer to PLC state memory
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*/
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void sbc_plc_init(sbc_plc_state_t *plc_state);
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/**
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* Perform PLC deinitialization of memory vectors.
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*
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* @param plc_state pointer to PLC state memory
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*/
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void sbc_plc_deinit(sbc_plc_state_t *plc_state);
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/**
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* Perform bad frame processing.
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*
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* @param plc_state pointer to PLC state memory
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* @param ZIRbuf pointer to the ZIR response of the SBC decoder
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* @param out pointer to the output samples
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*/
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void sbc_plc_bad_frame(sbc_plc_state_t *plc_state, int16_t *ZIRbuf, int16_t *out);
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/**
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* Perform good frame processing. Most of the time, this function
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* just updates history buffers and passes the input to the output,
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* but in the first good frame after frame loss, it must conceal the
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* received signal as it reconverges with the true output.
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*
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* @param plc_state pointer to PLC state memory
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* @param in pointer to the input vector
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* @param out pointer to the output samples
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*/
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void sbc_plc_good_frame(sbc_plc_state_t *plc_state, int16_t *in, int16_t *out);
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/**
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* Get a zero signal eSCO frame
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* @return pointer to data buffer
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*/
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uint8_t * sbc_plc_zero_signal_frame(void);
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/**
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* Get a zero signal eSCO pcm frame
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* @return pointer to data buffer
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*/
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int16_t * sbc_plc_zero_signal_frame_pcm(void);
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#if defined __cplusplus
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}
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#endif
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#endif /// _SBC_PLC_H
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