blob: b8219bcd840a92033015ec0aa02507d4bff7f7dd
| 1 | /* |
| 2 | *=================================================================== |
| 3 | * 3GPP AMR Wideband Floating-point Speech Codec |
| 4 | *=================================================================== |
| 5 | */ |
| 6 | #ifndef DEC_DTX_H |
| 7 | #define DEC_DTX_H |
| 8 | |
| 9 | #include "typedef.h" |
| 10 | |
| 11 | #define M 16 /* Order of LP filter */ |
| 12 | #define SPEECH 0 |
| 13 | #define DTX 1 |
| 14 | #define D_DTX_MUTE 2 |
| 15 | #define D_DTX_HIST_SIZE 8 |
| 16 | |
| 17 | typedef struct { |
| 18 | Word16 mem_isf_buf[M * D_DTX_HIST_SIZE]; /* ISF vector history (8 frames)*/ |
| 19 | Word16 mem_isf[M]; /* ISF vector */ |
| 20 | Word16 mem_isf_prev[M]; /* Previous ISF vector */ |
| 21 | Word16 mem_log_en_buf[D_DTX_HIST_SIZE];/* logarithmic frame energy history*/ |
| 22 | Word16 mem_true_sid_period_inv; /* inverse of true SID update rate */ |
| 23 | Word16 mem_log_en; /* logarithmic frame energy */ |
| 24 | Word16 mem_log_en_prev; /* previous logarithmic frame energy */ |
| 25 | Word16 mem_cng_seed; /* Comfort noise excitation seed */ |
| 26 | Word16 mem_hist_ptr; /* index to beginning of LSF history */ |
| 27 | Word16 mem_dither_seed; /* comfort noise dithering seed */ |
| 28 | Word16 mem_cn_dith; /* background noise stationarity information*/ |
| 29 | Word16 mem_since_last_sid; /* number of frames since last SID frame */ |
| 30 | |
| 31 | UWord8 mem_dec_ana_elapsed_count;/* counts elapsed speech frames after DTX*/ |
| 32 | UWord8 mem_dtx_global_state; /* DTX state flags */ |
| 33 | UWord8 mem_data_updated; /* flags CNI updates */ |
| 34 | UWord8 mem_dtx_hangover_count;/* counts down in hangover period */ |
| 35 | UWord8 mem_sid_frame; /* flags SID frames */ |
| 36 | UWord8 mem_valid_data; /* flags SID frames containing valid data */ |
| 37 | UWord8 mem_dtx_hangover_added;/* flags hangover period at end of speech */ |
| 38 | |
| 39 | } D_DTX_State; |
| 40 | |
| 41 | int D_DTX_init(D_DTX_State **st, const Word16 *isf_init); |
| 42 | int D_DTX_reset(D_DTX_State *st, const Word16 *isf_init); |
| 43 | void D_DTX_exit(D_DTX_State **st); |
| 44 | UWord8 D_DTX_rx_handler(D_DTX_State *st, UWord8 frame_type); |
| 45 | void D_DTX_exe(D_DTX_State *st, Word16 *exc2, Word16 new_state, |
| 46 | Word16 isf[], Word16 **prms); |
| 47 | void D_DTX_activity_update(D_DTX_State *st, Word16 isf[], Word16 exc[]); |
| 48 | |
| 49 | #endif |
| 50 |