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Macros | |
| #define | G729_TILT_FACTOR_PLUS 6554 |
| tilt compensation factor (G.729, k1>0) 0.2 in Q15 More... | |
| #define | G729_TILT_FACTOR_MINUS 29491 |
| tilt compensation factor (G.729, k1<0) 0.9 in Q15 More... | |
| #define | FORMANT_PP_FACTOR_NUM 18022 |
| #define | FORMANT_PP_FACTOR_DEN 22938 |
| #define | G729_AGC_FACTOR 32358 |
| gain adjustment factor (G.729, 4.2.4) 0.9875 in Q15 More... | |
| #define | G729_AGC_FAC1 (32768-G729_AGC_FACTOR) |
| #define | MIN_LT_FILT_FACTOR_A 21845 |
| 1.0 / (1.0 + 0.5) in Q15 where 0.5 is the minimum value of weight factor, controlling amount of long-term postfiltering More... | |
| #define | SHORT_INT_FILT_LEN 2 |
| Short interpolation filter length. More... | |
| #define | LONG_INT_FILT_LEN 8 |
| Long interpolation filter length. More... | |
| #define | ANALYZED_FRAC_DELAYS 7 |
| Number of analyzed fractional pitch delays in second stage of long-term postfilter. More... | |
| #define | RES_PREV_DATA_SIZE (PITCH_DELAY_MAX + LONG_INT_FILT_LEN + 1) |
| Amount of past residual signal data stored in buffer. More... | |
Functions | |
| void | ff_g729_postfilter (AudioDSPContext *adsp, int16_t *ht_prev_data, int *voicing, const int16_t *lp_filter_coeffs, int pitch_delay_int, int16_t *residual, int16_t *res_filter_data, int16_t *pos_filter_data, int16_t *speech, int subframe_size) |
| Signal postfiltering (4.2) More... | |
| int16_t | ff_g729_adaptive_gain_control (int gain_before, int gain_after, int16_t *speech, int subframe_size, int16_t gain_prev) |
| Adaptive gain control (4.2.4) More... | |
| #define G729_TILT_FACTOR_PLUS 6554 |
tilt compensation factor (G.729, k1>0) 0.2 in Q15
Definition at line 31 of file g729postfilter.h.
Referenced by apply_tilt_comp().
| #define G729_TILT_FACTOR_MINUS 29491 |
tilt compensation factor (G.729, k1<0) 0.9 in Q15
Definition at line 37 of file g729postfilter.h.
Referenced by apply_tilt_comp().
| #define FORMANT_PP_FACTOR_NUM 18022 |
Definition at line 40 of file g729postfilter.h.
| #define FORMANT_PP_FACTOR_DEN 22938 |
Definition at line 41 of file g729postfilter.h.
| #define G729_AGC_FACTOR 32358 |
gain adjustment factor (G.729, 4.2.4) 0.9875 in Q15
Definition at line 47 of file g729postfilter.h.
Referenced by ff_g729_adaptive_gain_control().
| #define G729_AGC_FAC1 (32768-G729_AGC_FACTOR) |
Definition at line 48 of file g729postfilter.h.
Referenced by ff_g729_adaptive_gain_control().
| #define MIN_LT_FILT_FACTOR_A 21845 |
1.0 / (1.0 + 0.5) in Q15 where 0.5 is the minimum value of weight factor, controlling amount of long-term postfiltering
Definition at line 55 of file g729postfilter.h.
Referenced by long_term_filter().
| #define SHORT_INT_FILT_LEN 2 |
Short interpolation filter length.
Definition at line 60 of file g729postfilter.h.
Referenced by long_term_filter().
| #define LONG_INT_FILT_LEN 8 |
Long interpolation filter length.
Definition at line 65 of file g729postfilter.h.
Referenced by long_term_filter().
| #define ANALYZED_FRAC_DELAYS 7 |
Number of analyzed fractional pitch delays in second stage of long-term postfilter.
Definition at line 71 of file g729postfilter.h.
Referenced by long_term_filter().
| #define RES_PREV_DATA_SIZE (PITCH_DELAY_MAX + LONG_INT_FILT_LEN + 1) |
Amount of past residual signal data stored in buffer.
Definition at line 76 of file g729postfilter.h.
Referenced by ff_g729_postfilter(), and long_term_filter().
| void ff_g729_postfilter | ( | AudioDSPContext * | adsp, |
| int16_t * | ht_prev_data, | ||
| int * | voicing, | ||
| const int16_t * | lp_filter_coeffs, | ||
| int | pitch_delay_int, | ||
| int16_t * | residual, | ||
| int16_t * | res_filter_data, | ||
| int16_t * | pos_filter_data, | ||
| int16_t * | speech, | ||
| int | subframe_size | ||
| ) |
Signal postfiltering (4.2)
| dsp | initialized DSP context |
| ht_prev_data | [in/out] (Q12) pointer to variable receiving tilt compensation filter data from previous subframe |
| voicing | [in/out] (Q0) pointer to variable receiving voicing decision |
| lp_filter_coeffs | (Q12) LP filter coefficients |
| pitch_delay_int | integer part of the pitch delay |
| residual | [in/out] (Q0) residual signal buffer (used in long-term postfilter) |
| res_filter_data | [in/out] (Q0) speech data of previous subframe |
| pos_filter_data | [in/out] (Q0) previous speech data for short-term postfilter |
| speech | [in/out] (Q0) signal buffer |
| subframe_size | size of subframe |
Filtering has the following stages: Long-term postfilter (4.2.1) Short-term postfilter (4.2.2). Tilt-compensation (4.2.3)
Definition at line 514 of file g729postfilter.c.
Referenced by decode_frame().
| int16_t ff_g729_adaptive_gain_control | ( | int | gain_before, |
| int | gain_after, | ||
| int16_t * | speech, | ||
| int | subframe_size, | ||
| int16_t | gain_prev | ||
| ) |
Adaptive gain control (4.2.4)
| gain_before | (Q0) gain of speech before applying postfilters |
| gain_after | (Q0) gain of speech after applying postfilters |
| speech | [in/out] (Q0) signal buffer |
| subframe_size | length of subframe |
| gain_prev | (Q12) previous value of gain coefficient |
| gain_before | gain of speech before applying postfilters |
| gain_after | gain of speech after applying postfilters |
| speech | [in/out] signal buffer |
| subframe_size | length of subframe |
| gain_prev | (3.12) previous value of gain coefficient |
Definition at line 574 of file g729postfilter.c.
Referenced by decode_frame().
1.8.6