35 void rate_estimator_destroy(struct rate_estimator *re)  in rate_estimator_destroy()  argument
37 	if (re)  in rate_estimator_destroy()
38 		free(re);  in rate_estimator_destroy()
45 	struct rate_estimator *re;  in rate_estimator_create()  local
47 	re = (struct rate_estimator *)calloc(1, sizeof(*re));  in rate_estimator_create()
48 	if (re == NULL)  in rate_estimator_create()
51 	re->window_size = *window_size;  in rate_estimator_create()
52 	re->estimated_rate = rate;  in rate_estimator_create()
53 	re->smooth_factor = smooth_factor;  in rate_estimator_create()
55 	return re;  in rate_estimator_create()
58 void rate_estimator_add_frames(struct rate_estimator *re, int fr)  in rate_estimator_add_frames()  argument
60 	re->level_diff += fr;  in rate_estimator_add_frames()
63 double rate_estimator_get_rate(struct rate_estimator *re)  in rate_estimator_get_rate()  argument
65 	return re->estimated_rate;  in rate_estimator_get_rate()
68 void rate_estimator_reset_rate(struct rate_estimator *re, unsigned int rate)  in rate_estimator_reset_rate()  argument
70 	re->estimated_rate = rate;  in rate_estimator_reset_rate()
71 	least_square_reset(&re->lsq);  in rate_estimator_reset_rate()
72 	re->window_start_ts.tv_sec = 0;  in rate_estimator_reset_rate()
73 	re->window_start_ts.tv_nsec = 0;  in rate_estimator_reset_rate()
74 	re->window_frames = 0;  in rate_estimator_reset_rate()
75 	re->level_diff = 0;  in rate_estimator_reset_rate()
76 	re->last_level = 0;  in rate_estimator_reset_rate()
79 int rate_estimator_check(struct rate_estimator *re, int level,  in rate_estimator_check()  argument
84 	if (re->window_start_ts.tv_sec == 0) {  in rate_estimator_check()
85 		re->window_start_ts = *now;  in rate_estimator_check()
89 	subtract_timespecs(now, &re->window_start_ts, &td);  in rate_estimator_check()
90 	re->window_frames += abs(re->last_level - level + re->level_diff);  in rate_estimator_check()
91 	re->level_diff = 0;  in rate_estimator_check()
92 	re->last_level = level;  in rate_estimator_check()
94 	least_square_add_sample(&re->lsq,  in rate_estimator_check()
96 				re->window_frames);  in rate_estimator_check()
97 	if (timespec_after(&td, &re->window_size) &&  in rate_estimator_check()
98 	    re->lsq.num_samples > 1) {  in rate_estimator_check()
99 		double rate = least_square_best_fit_slope(&re->lsq);  in rate_estimator_check()
100 		if (fabs(re->estimated_rate - rate) < MAX_RATE_SKEW)  in rate_estimator_check()
101 			re->estimated_rate = rate * (1 - re->smooth_factor) +  in rate_estimator_check()
102 					re->smooth_factor * re->estimated_rate;  in rate_estimator_check()
103 		least_square_reset(&re->lsq);  in rate_estimator_check()
104 		re->window_start_ts = *now;  in rate_estimator_check()
105 		re->window_frames = 0;  in rate_estimator_check()