replace delete in AudioThread.h with std::unique_ptr (#9651)

Is part of the unique_ptr modernization effort.

src/AudioThread.h

@@ -4,6 +4,7 @@
 #include "configuration.h"
 #include "main.h"
 #include "sleep.h"
+#include <memory>
 
 #ifdef HAS_I2S
 #include <AudioFileSourcePROGMEM.h>
@@ -29,9 +30,9 @@ class AudioThread : public concurrency::OSThread
         io.digitalWrite(EXPANDS_AMP_EN, HIGH);
 #endif
         setCPUFast(true);
-        rtttlFile = new AudioFileSourcePROGMEM(data, len);
-        i2sRtttl = new AudioGeneratorRTTTL();
-        i2sRtttl->begin(rtttlFile, audioOut);
+        rtttlFile = std::unique_ptr<AudioFileSourcePROGMEM>(new AudioFileSourcePROGMEM(data, len));
+        i2sRtttl = std::unique_ptr<AudioGeneratorRTTTL>(new AudioGeneratorRTTTL());
+        i2sRtttl->begin(rtttlFile.get(), audioOut.get());
     }
 
     // Also handles actually playing the RTTTL, needs to be called in loop
@@ -47,12 +48,10 @@ class AudioThread : public concurrency::OSThread
     {
         if (i2sRtttl != nullptr) {
             i2sRtttl->stop();
-            delete i2sRtttl;
             i2sRtttl = nullptr;
         }
 
         if (rtttlFile != nullptr) {
-            delete rtttlFile;
             rtttlFile = nullptr;
         }
 
@@ -66,16 +65,14 @@ class AudioThread : public concurrency::OSThread
     {
         if (i2sRtttl != nullptr) {
             i2sRtttl->stop();
-            delete i2sRtttl;
             i2sRtttl = nullptr;
         }
 
 #ifdef T_LORA_PAGER
         io.digitalWrite(EXPANDS_AMP_EN, HIGH);
 #endif
-        ESP8266SAM *sam = new ESP8266SAM;
-        sam->Say(audioOut, text);
-        delete sam;
+        auto sam = std::unique_ptr<ESP8266SAM>(new ESP8266SAM);
+        sam->Say(audioOut.get(), text);
         setCPUFast(false);
 #ifdef T_LORA_PAGER
         io.digitalWrite(EXPANDS_AMP_EN, LOW);
@@ -96,15 +93,15 @@ class AudioThread : public concurrency::OSThread
   private:
     void initOutput()
     {
-        audioOut = new AudioOutputI2S(1, AudioOutputI2S::EXTERNAL_I2S);
+        audioOut = std::unique_ptr<AudioOutputI2S>(new AudioOutputI2S(1, AudioOutputI2S::EXTERNAL_I2S));
         audioOut->SetPinout(DAC_I2S_BCK, DAC_I2S_WS, DAC_I2S_DOUT, DAC_I2S_MCLK);
         audioOut->SetGain(0.2);
     };
 
-    AudioGeneratorRTTTL *i2sRtttl = nullptr;
-    AudioOutputI2S *audioOut = nullptr;
+    std::unique_ptr<AudioGeneratorRTTTL> i2sRtttl = nullptr;
+    std::unique_ptr<AudioOutputI2S> audioOut = nullptr;
 
-    AudioFileSourcePROGMEM *rtttlFile = nullptr;
+    std::unique_ptr<AudioFileSourcePROGMEM> rtttlFile = nullptr;
 };
 
 #endif