add RSSI + disable equalizer when not needed - release

components/squeezelite/embedded.c

@@ -23,6 +23,7 @@
 #include "esp_pthread.h"
 #include "esp_system.h"
 #include "esp_timer.h"
+#include "esp_wifi.h"
 
 void get_mac(u8_t mac[]) {
     esp_read_mac(mac, ESP_MAC_WIFI_STA);
@@ -58,3 +59,11 @@ void embedded_init(void) {
 	sb_controls_init();
 	if (sb_display_init()) custom_player_id = 100;
 }
+
+u16_t get_RSSI(void) {
+    wifi_ap_record_t wifidata;
+    esp_wifi_sta_get_ap_info(&wifidata);
+	// we'll assume dBm, -30 to -100
+    if (wifidata.primary != 0) return 100 + wifidata.rssi + 30;
+    else return 0xffff;
+}	

components/squeezelite/embedded.h

@@ -59,6 +59,9 @@ void 		register_external(void);
 void 		deregister_external(void);
 void 		decode_restore(int external);
 
+// must provide or define as 0xffff
+u16_t		get_RSSI(void);
+
 // to be defined to nothing if you don't want to support these
 extern struct visu_export_s {
 	pthread_mutex_t mutex;

components/squeezelite/equalizer.c

@@ -45,11 +45,18 @@ void equalizer_open(u32_t sample_rate) {
 	equalizer.update = false;
     
 	if (equalizer.handle) {
-		LOG_INFO("equalizer initialized");
+		bool active = false;
+		
 		for (int i = 0; i < EQ_BANDS; i++) {
 			esp_equalizer_set_band_value(equalizer.handle, equalizer.gain[i], i, 0);
 			esp_equalizer_set_band_value(equalizer.handle, equalizer.gain[i], i, 1);
+			active |= equalizer.gain[i] != 0;
 		}
+		
+		// do not activate equalizer if all gain are 0
+		if (!active) equalizer_close();
+		
+		LOG_INFO("equalizer initialized %u", active);
 	} else {
 		LOG_WARN("can't init equalizer");
 	}	

components/squeezelite/slimproto.c

@@ -183,7 +183,11 @@ static void sendSTAT(const char *event, u32_t server_timestamp) {
 	packN(&pkt.stream_buffer_size, status.stream_size);
 	packN(&pkt.bytes_received_H, (u64_t)status.stream_bytes >> 32);
 	packN(&pkt.bytes_received_L, (u64_t)status.stream_bytes & 0xffffffff);
+#if EMBEDDED
+	packn(&pkt.signal_strength, get_RSSI());
+#else 
 	pkt.signal_strength = 0xffff;
+#endif	
 	packN(&pkt.jiffies, now);
 	packN(&pkt.output_buffer_size, status.output_size);
 	packN(&pkt.output_buffer_fullness, status.output_full);