FreeCalypso > hg > gsm-codec-lib
view libgsmefr/dtx.h @ 216:9d59df9b0e4e
amrconv: new program amr-ietf2cod
author | Mychaela Falconia <falcon@freecalypso.org> |
---|---|
date | Fri, 21 Apr 2023 21:28:02 +0000 |
parents | a18782a7d270 |
children |
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/*************************************************************************** * * File Name: dtx.h * * Purpose: Contains the prototypes for all the functions of DTX. * Also contains definitions of constants used in DTX functions. * **************************************************************************/ #define PN_INITIAL_SEED 0x70816958L /* Pseudo noise generator seed value */ #define CN_INT_PERIOD 24 /* Comfort noise interpolation period (nbr of frames between successive SID updates in the decoder) */ #define DTX_HANGOVER 7 /* Period when SP=1 although VAD=0. Used for comfort noise averaging */ /* Frame classification constants */ #define VALID_SID_FRAME 1 #define INVALID_SID_FRAME 2 #define GOOD_SPEECH_FRAME 3 #define UNUSABLE_FRAME 4 /* Encoder DTX control flags */ #define TX_SP_FLAG 0x0001 #define TX_VAD_FLAG 0x0002 #define TX_HANGOVER_ACTIVE 0x0004 #define TX_PREV_HANGOVER_ACTIVE 0x0008 #define TX_SID_UPDATE 0x0010 #define TX_USE_OLD_SID 0x0020 /* Decoder DTX control flags */ #define RX_SP_FLAG 0x0001 #define RX_UPD_SID_QUANT_MEM 0x0002 #define RX_FIRST_SID_UPDATE 0x0004 #define RX_CONT_SID_UPDATE 0x0008 #define RX_LOST_SID_FRAME 0x0010 #define RX_INVALID_SID_FRAME 0x0020 #define RX_NO_TRANSMISSION 0x0040 #define RX_DTX_MUTING 0x0080 #define RX_PREV_DTX_MUTING 0x0100 #define RX_CNI_BFI 0x0200 #define RX_FIRST_SP_FLAG 0x0400 void reset_tx_dtx (struct EFR_encoder_state *st); /* Reset tx dtx variables */ void reset_rx_dtx (struct EFR_decoder_state *st); /* Reset rx dtx variables */ void tx_dtx ( struct EFR_encoder_state *st, Word16 VAD_flag ); void rx_dtx ( struct EFR_decoder_state *st, Word16 TAF, Word16 bfi, Word16 SID_flag ); void CN_encoding ( struct EFR_encoder_state *st, Word16 params[], Word16 txdtx_ctrl ); void update_lsf_history ( Word16 lsf1[M], Word16 lsf2[M], Word16 lsf_old[DTX_HANGOVER][M] ); void update_lsf_p_CN ( Word16 lsf_old[DTX_HANGOVER][M], Word16 lsf_p_CN[M] ); void aver_lsf_history ( Word16 lsf_old[DTX_HANGOVER][M], Word16 lsf1[M], Word16 lsf2[M], Word16 lsf_aver[M] ); void update_gain_code_history_tx ( struct EFR_encoder_state *st, Word16 new_gain_code ); void update_gain_code_history_rx ( struct EFR_decoder_state *st, Word16 new_gain_code ); Word16 compute_CN_excitation_gain ( Word16 res2[L_SUBFR] ); Word16 update_gcode0_CN ( Word16 gain_code_old_tx[4 * DTX_HANGOVER] ); Word16 aver_gain_code_history ( Word16 CN_excitation_gain, Word16 gain_code_old[4 * DTX_HANGOVER] ); void build_CN_code ( Word16 cod[], Word32 *seed ); Word16 pseudonoise ( Word32 *shift_reg, Word16 no_bits ); Word16 interpolate_CN_param ( Word16 old_param, Word16 new_param, Word16 rx_dtx_state ); void interpolate_CN_lsf ( Word16 lsf_old_CN[M], Word16 lsf_new_CN[M], Word16 lsf_interp_CN[M], Word16 rx_dtx_state );