1 /*-
70  * "power" should be in the range <0.0f .. 2.0f>
72  * The return value is in the range [-1.0f .. 1.0f]
75 wave_function_16(float phase, float power)  in wave_function_16()  argument
93 		return (-1.0f);  in wave_function_16()
101 			x ^= (mask - 1);  in wave_function_16()
115 	/* Compute the rest of the power series */  in wave_function_16()
118 			retval = (1.0f - retval) / 2.0f;  in wave_function_16()
119 			retval = powf(retval, power);  in wave_function_16()
122 			retval = powf(retval, power);  in wave_function_16()
128 		retval = -retval;  in wave_function_16()
137 	    "\t" "-F <frequency in HZ, default %d Hz>\n"  in usage()
138 	    "\t" "-D <duration in ms, from %d ms to %d ms, default %d ms>\n"  in usage()
139 	    "\t" "-r <sample rate in HZ, from %d Hz to %d Hz, default %d Hz>\n"  in usage()
140 	    "\t" "-d <OSS device (default %s)>\n"  in usage()
141 	    "\t" "-g <gain from %d to %d, default %d>\n"  in usage()
142 	    "\t" "-B Run in background\n"  in usage()
143 	    "\t" "-h Show usage\n",  in usage()
159 	size_t off;  in main()  local
166 	while ((c = getopt(argc, argv, "BF:D:r:g:d:h")) != -1) {  in main()
208 	if (caph_enter() == -1)  in main()
247 	for (p = off = 0; off != size; off++, p += d) {  in main()
250 		p = p - floorf(p);  in main()
253 		if (off < slope)  in main()
254 			sample = sample * off / (float)slope;  in main()
255 		else if (off > (size - slope))  in main()
256 			sample = sample * (size - off - 1) / (float)slope;  in main()
258 		buffer[off] = sample;  in main()