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view libgsmefr/gsm_efr.h @ 183:452c1d5a6268

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libgsmefr BFI w/o data: emit zero output after decoder reset In real-life usage, each EFR decoder session will most likely begin with lots of BFI frames before the first real frame arrives. However, because the spec-defined home state of the decoder is speech rather than CN, our regular logic for BFI w/o data would have to feed pseudorandom noise to the decoder (in the "fixed codebook excitation pulses" part), which is silly to do at the beginning of the decoder session right out of reset. Therefore, let's check reset_flag_old, and if we are still in the reset state, simply emit zero output.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 03 Jan 2023 00:12:18 +0000
parents 88468d5b3590
children 9499d12d315b
line wrap: on
line source

/*
 * This header file is the external public interface to libgsmefr;
 * it should be installed in the same system include directory
 * as <gsm.h> and <gsm_fr_preproc.h> for the older FR codec.
 */

#ifndef	__GSM_EFR_H
#define	__GSM_EFR_H

#include <stdint.h>

#define	EFR_RTP_FRAME_LEN	31
#define	EFR_NUM_PARAMS		57

struct EFR_encoder_state;	/* opaque to external users */
struct EFR_decoder_state;	/* ditto */

extern struct EFR_encoder_state *EFR_encoder_create(int dtx);
extern struct EFR_decoder_state *EFR_decoder_create(void);
/* use standard free() call to free both afterward */

/* reset state to initial */
extern void EFR_encoder_reset(struct EFR_encoder_state *st, int dtx);
extern void EFR_decoder_reset(struct EFR_decoder_state *st);

/* encoder public functions */

extern void EFR_encode_params(struct EFR_encoder_state *st, const int16_t *pcm,
			      int16_t *params, int *sp, int *vad);
extern void EFR_encode_frame(struct EFR_encoder_state *st, const int16_t *pcm,
			     uint8_t *frame, int *sp, int *vad);

/* decoder public functions */

extern void EFR_decode_params(struct EFR_decoder_state *st,
			      const int16_t *params, int bfi, int sid, int taf,
			      int16_t *pcm);
extern void EFR_decode_frame(struct EFR_decoder_state *st, const uint8_t *frame,
			     int bfi, int taf, int16_t *pcm);
extern void EFR_decode_bfi_nodata(struct EFR_decoder_state *st, int taf,
				  int16_t *pcm);

/* stateless utility functions */

extern int EFR_sid_classify(const uint8_t *frame);
extern void EFR_frame2params(const uint8_t *frame, int16_t *params);
extern void EFR_params2frame(const int16_t *params, uint8_t *frame);
extern void EFR_insert_sid_codeword(uint8_t *frame);

#endif	/* include guard */