Use heap_caps_malloc_prefer instead of switching allocator by CONFIG_SPIRAM.

Author: ciniml

Diff for: src/webrtc.cpp

@@ -37,20 +37,20 @@ static void oai_onconnectionstatechange_task(PeerConnectionState state,
 #endif
   } else if (state == PEER_CONNECTION_CONNECTED) {
 #ifndef LINUX_BUILD
-#if CONFIG_SPIRAM
     constexpr size_t stack_size = 20000;
-    StackType_t *stack_memory = (StackType_t *)heap_caps_malloc(
-        20000 * sizeof(StackType_t), MALLOC_CAP_SPIRAM);
-#else // CONFIG_SPIRAM
-    constexpr size_t stack_size = 20000;
-    StackType_t *stack_memory = (StackType_t *)malloc(stack_size * sizeof(StackType_t));
-#endif // CONFIG_SPIRAM
+    // Allocate the stack memory from the PSRAM if available. Otherwise,
+    // allocate from the internal memory.
+    StackType_t *stack_memory = (StackType_t *)heap_caps_malloc_prefer(
+        stack_size * sizeof(StackType_t), 2,
+        MALLOC_CAP_SPIRAM | MALLOC_CAP_8BIT,
+        MALLOC_CAP_INTERNAL | MALLOC_CAP_8BIT);
     if (stack_memory == nullptr) {
       ESP_LOGE(LOG_TAG, "Failed to allocate stack memory for audio publisher.");
       esp_restart();
     }
-    xTaskCreateStaticPinnedToCore(oai_send_audio_task, "audio_publisher", stack_size,
-                                  NULL, 7, stack_memory, &task_buffer, 0);
+    xTaskCreateStaticPinnedToCore(oai_send_audio_task, "audio_publisher",
+                                  stack_size, NULL, 7, stack_memory,
+                                  &task_buffer, 0);
 #endif
   }
 }