feat(AFE): modify alloc_from_PSRAM to support flexible memory allocation

audio_front_end/esp_afe_sr_1mic.c

@@ -142,6 +142,8 @@ static esp_afe_sr_data_t *afe_create_from_config(afe_config_t *afe_config)
             abort();
         }
         afe->agc_mode = afe_config->agc_mode;
+        if (afe->agc_mode > 3) afe->agc_mode = 3;
+        if (afe->agc_mode < 0) afe->agc_mode = 0;
     } else {
         afe->wn_nch = 1;
         afe->enable_wn = 0;
@@ -290,8 +292,9 @@ static int afe_fetch(esp_afe_sr_data_t *afe, int16_t *out)
         res = afe->wakenet->detect(afe->model_data, afe->buff_wn);
         //selector & gainer
         afe->channel_id = afe->wakenet->get_triggered_channel(afe->model_data);
-        if (res > 0 && afe->agc_mode) {
-            out_gain = afe->wakenet->get_vol_gain(afe->model_data, -5);
+        if (res > 0 && afe->agc_mode>=0) {
+            if (afe->agc_mode == 0) out_gain = 1;
+            else out_gain = afe->wakenet->get_vol_gain(afe->model_data, (afe->agc_mode-6));
         }
 
         int shift = afe->audio_chunksize * afe->channel_id;

audio_front_end/include/esp_afe_sr_iface.h

@@ -37,7 +37,7 @@ typedef struct {
     int afe_perferred_core;
     int afe_perferred_priority;
     int afe_ringbuf_size;
-    bool alloc_from_psram;
+    int alloc_from_psram;
     int agc_mode;
 } afe_config_t;
 
@@ -54,7 +54,7 @@ typedef struct {
     .afe_perferred_core = 0, \
     .afe_perferred_priority = 5, \
     .afe_ringbuf_size = 50, \
-    .alloc_from_psram = true, \
+    .alloc_from_psram = 1, \
     .agc_mode = 2, \
 }