73 lines
3.6 KiB
C
73 lines
3.6 KiB
C
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/*
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*===================================================================
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* 3GPP AMR Wideband Floating-point Speech Codec
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*===================================================================
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*/
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#ifndef ENC_F_DTX_H
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#define ENC_F_DTX_H
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#include "typedef.h"
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#define M 16 /* Order of LP filter */
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#define DTX_HIST_SIZE 8 /* 8 frames */
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#define COMPLEN 12 /* Number of sub-bands used by VAD */
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#define F_5TH_CNT 5 /* Number of 5th order filters in VAD */
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#define F_3TH_CNT 6 /* Number of 3th order filters in VAD */
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typedef struct {
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Float32 mem_isf[M * DTX_HIST_SIZE]; /* LSP history */
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Float32 mem_distance[28]; /* ISF history distance matrix */
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Float32 mem_distance_sum[DTX_HIST_SIZE];/* Sum of ISF history distances */
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Float32 mem_log_en[DTX_HIST_SIZE]; /* logarithmic frame energy history */
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Word16 mem_hist_ptr; /* pointer to the cyclic history vectors */
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Word16 mem_log_en_index; /* Index for logarithmic energy */
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Word16 mem_cng_seed; /* Comfort noise excitation seed */
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Word16 mem_dtx_hangover_count; /* DTX hangover period */
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Word16 mem_dec_ana_elapsed_count;/* counter for elapsed speech frames */
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/* in DTX */
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} E_DTX_State;
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typedef struct {
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Float64 mem_pow_sum; /* power of previous frame */
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Float32 mem_bckr_est[COMPLEN]; /* background noise estimate */
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Float32 mem_ave_level[COMPLEN]; /* averaged input components */
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/* for stationary estimation */
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Float32 mem_level[COMPLEN]; /* input levels of the previous frame */
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Float32 mem_sub_level[COMPLEN]; /* input levels calculated at the end of */
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/* a frame (lookahead) */
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Float32 mem_a_data5[F_5TH_CNT][2];/* memory for the filter bank */
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Float32 mem_a_data3[F_3TH_CNT]; /* memory for the filter bank */
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Float32 mem_sp_max; /* maximum level */
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Float32 mem_speech_level; /* estimated speech level */
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Word16 mem_burst_count; /* counts length of a speech burst */
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Word16 mem_hang_count; /* hangover counter */
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Word16 mem_stat_count; /* stationary counter */
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Word16 mem_vadreg; /* flags for intermediate VAD decisions */
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Word16 mem_pitch_tone; /* flags for pitch and tone detection */
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Word16 mem_sp_est_cnt; /* counter for speech level estimation */
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Word16 mem_sp_max_cnt; /* counts frames that contains speech */
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} E_DTX_Vad_State;
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Word32 E_DTX_init(E_DTX_State **st);
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Word32 E_DTX_reset(E_DTX_State *st);
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void E_DTX_exit(E_DTX_State **st);
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void E_DTX_tx_handler(E_DTX_State *st, Word32 vad_flag, Word16 *usedMode);
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void E_DTX_buffer(E_DTX_State *st, Float32 isf_new[], Float32 enr,
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Word16 codec_mode);
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void E_DTX_exe(E_DTX_State *st, Float32 *exc2, Word16 **pt_prms);
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Word32 E_DTX_vad_init(E_DTX_Vad_State **st);
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Word32 E_DTX_vad_reset(E_DTX_Vad_State *st);
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void E_DTX_vad_exit(E_DTX_Vad_State **st);
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void E_DTX_pitch_tone_detection(E_DTX_Vad_State *st, Float32 p_gain);
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Word16 E_DTX_vad(E_DTX_Vad_State *st, Float32 in_buf[]);
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#endif
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