dec_dtx.h
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上传日期:2013-07-19
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文件大小:2k
- /*
- *===================================================================
- * 3GPP AMR Wideband Floating-point Speech Codec
- *===================================================================
- */
- #ifndef DEC_DTX_H
- #define DEC_DTX_H
- #include "typedef.h"
- #define M 16 /* Order of LP filter */
- #define SPEECH 0
- #define DTX 1
- #define D_DTX_MUTE 2
- #define D_DTX_HIST_SIZE 8
- typedef struct {
- Word16 mem_isf_buf[M * D_DTX_HIST_SIZE]; /* ISF vector history (8 frames)*/
- Word16 mem_isf[M]; /* ISF vector */
- Word16 mem_isf_prev[M]; /* Previous ISF vector */
- Word16 mem_log_en_buf[D_DTX_HIST_SIZE];/* logarithmic frame energy history*/
- Word16 mem_true_sid_period_inv; /* inverse of true SID update rate */
- Word16 mem_log_en; /* logarithmic frame energy */
- Word16 mem_log_en_prev; /* previous logarithmic frame energy */
- Word16 mem_cng_seed; /* Comfort noise excitation seed */
- Word16 mem_hist_ptr; /* index to beginning of LSF history */
- Word16 mem_dither_seed; /* comfort noise dithering seed */
- Word16 mem_cn_dith; /* background noise stationarity information*/
- UWord8 mem_dec_ana_elapsed_count;/* counts elapsed speech frames after DTX*/
- UWord8 mem_dtx_global_state; /* DTX state flags */
- UWord8 mem_since_last_sid; /* number of frames since last SID frame */
- UWord8 mem_data_updated; /* flags CNI updates */
- UWord8 mem_dtx_hangover_count;/* counts down in hangover period */
- UWord8 mem_sid_frame; /* flags SID frames */
- UWord8 mem_valid_data; /* flags SID frames containing valid data */
- UWord8 mem_dtx_hangover_added;/* flags hangover period at end of speech */
- } D_DTX_State;
- int D_DTX_init(D_DTX_State **st, const Word16 *isf_init);
- int D_DTX_reset(D_DTX_State *st, const Word16 *isf_init);
- void D_DTX_exit(D_DTX_State **st);
- UWord8 D_DTX_rx_handler(D_DTX_State *st, UWord8 frame_type);
- void D_DTX_exe(D_DTX_State *st, Word16 *exc2, Word16 new_state,
- Word16 isf[], Word16 **prms);
- void D_DTX_activity_update(D_DTX_State *st, Word16 isf[], Word16 exc[]);
- #endif