Allow FIFO input sample rate to be configurable

Refs #275.

While it was mentioned that the ability to acquire this information from MPD
would be useful, allowing it to be configured explicitly could be allow FIFO
to be used for non-MPD sources as well.

cava.c

@@ -461,7 +461,7 @@ as of 0.4.0 all options are specified in config file, see in '/home/username/.co
 	if (p.im == 2) {
 		//starting fifomusic listener
 		thr_id = pthread_create(&p_thread, NULL, input_fifo, (void*)&audio);
-		audio.rate = 44100;
+		audio.rate = p.fifoSample;
 	}
 
 	#ifdef PULSE

config.c

@@ -13,7 +13,7 @@ double monstercat, integral, gravity, ignore, sens;
 unsigned int lowcf, highcf;
 double *smooth;
 int smcount, customEQ, im, om, col, bgcol, autobars, stereo, is_bin, ascii_range,
- bit_format, gradient, gradient_count, fixedbars, framerate, bw, bs, autosens, overshoot, waves, FFTbufferSize;
+ bit_format, gradient, gradient_count, fixedbars, framerate, bw, bs, autosens, overshoot, waves, FFTbufferSize, fifoSample;
 
 };
 
@@ -510,6 +510,7 @@ if (strcmp(inputMethod, "alsa") == 0) {
 if (strcmp(inputMethod, "fifo") == 0) {
 	p->im = 2;
 	p->audio_source = (char *)iniparser_getstring(ini, "input:source", "/tmp/mpd.fifo");
+	p->fifoSample = iniparser_getint(ini, "input:sample_rate", 44100);
 }
 if (strcmp(inputMethod, "pulse") == 0) {
 	p->im = 3;