fix low volume due to wrong init of audioDAC_data

add support for mixing stereo to mono through dsp_processor (fixes #106)
add sdkconfigs to github action workflow
suppress warnings from flac git submodule
remove unused variable and address some compiler warnings
remove some dead code

Signed-off-by: Karl Osterseher <karl_osterseher@gmx.at>

components/network_interface/eth_interface.c

@@ -476,7 +476,6 @@ static void eth_on_got_ipv6(void *arg, esp_event_base_t event_base,
 void eth_start(void) {
   // Initialize Ethernet driver
   esp_eth_handle_t *eth_handles;
-  esp_netif_t *eth_netif;
 
   if (!connIpSemaphoreHandle) {
     connIpSemaphoreHandle = xSemaphoreCreateMutex();
@@ -486,6 +485,8 @@ void eth_start(void) {
 
 #if CONFIG_SNAPCLIENT_USE_INTERNAL_ETHERNET || \
     CONFIG_SNAPCLIENT_USE_SPI_ETHERNET
+  esp_netif_t *eth_netif;
+
   // Create instance(s) of esp-netif for Ethernet(s)
   if (eth_port_cnt == 1) {
     // Use ESP_NETIF_DEFAULT_ETH when just one Ethernet interface is used and

components/network_interface/include/wifi_interface.h

@@ -1,6 +1,10 @@
 #ifndef _WIFI_INTERFACE_H_
 #define _WIFI_INTERFACE_H_
 
+#include <stdbool.h>
+
+#include "esp_netif.h"
+
 // use wifi provisioning
 #define ENABLE_WIFI_PROVISIONING CONFIG_ENABLE_WIFI_PROVISIONING
 

components/network_interface/network_interface.c

@@ -22,7 +22,6 @@
 #include "freertos/FreeRTOS.h"
 #include "freertos/event_groups.h"
 #include "freertos/task.h"
-#include "include/eth_interface.h"
 #include "sdkconfig.h"
 
 #if CONFIG_SNAPCLIENT_USE_INTERNAL_ETHERNET || \

components/network_interface/wifi_interface.c

@@ -4,9 +4,10 @@
 
     Must be taken over/merge with wifi provision
 */
-
 #include "wifi_interface.h"
 
+#include <string.h>  // for memcpy
+
 #include "esp_event.h"
 #include "esp_log.h"
 #include "esp_mac.h"
@@ -20,8 +21,6 @@
 #include "nvs_flash.h"
 
 #if ENABLE_WIFI_PROVISIONING
-#include <string.h>  // for memcpy
-
 #include "wifi_provisioning.h"
 #endif