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annotate libgsmefr/gsm_efr.h @ 555:62943a1ad64e

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doc/FR1-Rx-DTX-detail: grammar fix
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 11 Oct 2024 00:22:47 +0000
parents f2d0f2f15d5f
children
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1 /*
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2 * This header file is the external public interface to libgsmefr:
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3 * Themyscira Wireless implementation of GSM-EFR speech codec
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4 * based on the original ETSI code of GSM 06.53, adapted to the
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5 * RTP frame format of ETSI TS 101 318.
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6 *
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7 * This header file should be installed in some system include directory
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8 * such that it can be included by C sources as <gsm_efr.h>.
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9 */
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11 #ifndef __GSM_EFR_H
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12 #define __GSM_EFR_H
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14 #include <stdint.h>
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16 #define EFR_RTP_FRAME_LEN 31
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17 #define EFR_NUM_PARAMS 57
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19 struct EFR_encoder_state; /* opaque to external users */
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20 struct EFR_decoder_state; /* ditto */
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22 extern struct EFR_encoder_state *EFR_encoder_create(int dtx);
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23 extern struct EFR_decoder_state *EFR_decoder_create(void);
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24 /* use standard free() call to free both afterward */
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26 /* reset state to initial */
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27 extern void EFR_encoder_reset(struct EFR_encoder_state *st, int dtx);
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28 extern void EFR_decoder_reset(struct EFR_decoder_state *st);
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30 /* encoder public functions */
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32 extern void EFR_encode_params(struct EFR_encoder_state *st, const int16_t *pcm,
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33 int16_t *params, int *sp, int *vad);
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34 extern void EFR_encode_frame(struct EFR_encoder_state *st, const int16_t *pcm,
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35 uint8_t *frame, int *sp, int *vad);
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37 /* decoder public functions */
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39 extern void EFR_decode_params(struct EFR_decoder_state *st,
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40 const int16_t *params, int bfi, int sid, int taf,
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41 int16_t *pcm);
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42 extern void EFR_decode_frame(struct EFR_decoder_state *st, const uint8_t *frame,
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43 int bfi, int taf, int16_t *pcm);
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44 extern void EFR_decode_bfi_nodata(struct EFR_decoder_state *st, int taf,
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45 int16_t *pcm);
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46 extern int EFR_decode_rtp(struct EFR_decoder_state *st, const uint8_t *rtp_pl,
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47 unsigned rtp_pl_len, int16_t *pcm);
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49 /* stateless utility functions */
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51 extern int EFR_sid_classify(const uint8_t *frame);
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52 extern void EFR_frame2params(const uint8_t *frame, int16_t *params);
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53 extern void EFR_params2frame(const int16_t *params, uint8_t *frame);
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54 extern void EFR_insert_sid_codeword(uint8_t *frame);
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56 /* public const data item */
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58 extern const uint8_t EFR_decoder_homing_frame[EFR_RTP_FRAME_LEN];
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60 /* sizes of state structures, to support alternative malloc schemes */
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62 extern const unsigned EFR_encoder_state_size;
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63 extern const unsigned EFR_decoder_state_size;
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65 #endif /* include guard */