mini i2S backend to allow other DAC

components/squeezelite/null/dac_null.c

@@ -0,0 +1,32 @@
+/* 
+ *  Squeezelite for esp32
+ *
+ *  (c) Sebastien 2019
+ *      Philippe G. 2019, philippe_44@outlook.com
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+ 
+#include "adac.h"
+
+static bool init(int i2c_port_num, int i2s_num, i2s_config_t *config) { return true; };
+static void deinit(void) { };
+static void speaker(bool active) { };
+static void headset(bool active) { } ;
+static void volume(unsigned left, unsigned right) { };
+static void power(adac_power_e mode) { };
+
+struct adac_s dac_null = { init, deinit, power, speaker, headset, volume };
+