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libraries/audio-tools/examples/examples-desktop/mp3/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.20)
+
+# set the project name
+project(mp3_dt)
+set (CMAKE_CXX_STANDARD 11)
+set (DCMAKE_CXX_FLAGS "-Werror")
+
+include(FetchContent)
+option(BUILD_SHARED_LIBS "Build using shared libraries" OFF)
+option(ADD_PORTAUDIO "Add Portaudio Library" ON)
+
+if(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
+    add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/../../.. ${CMAKE_CURRENT_BINARY_DIR}/arduino-audio-tools )
+endif()
+
+# Build with libhelix
+FetchContent_Declare(arduino_helix GIT_REPOSITORY "https://github.com/pschatzmann/arduino-libhelix.git" GIT_TAG main )
+FetchContent_GetProperties(arduino_helix)
+if(NOT arduino_helix_POPULATED)
+    FetchContent_Populate(arduino_helix)
+    add_subdirectory(${arduino_helix_SOURCE_DIR})
+endif()
+
+# build sketch as executable
+set_source_files_properties(mp3.ino PROPERTIES LANGUAGE CXX)
+add_executable (mp3_dt mp3.ino)
+
+# set preprocessor defines
+target_compile_definitions(arduino_emulator PUBLIC -DDEFINE_MAIN)
+target_compile_definitions(arduino_helix PUBLIC -DARDUINO -DHELIX_LOGGING_ACTIVE=0)
+target_compile_definitions(mp3_dt PUBLIC -DIS_DESKTOP)
+
+# OS/X might need this setting for core audio
+target_compile_options(portaudio PRIVATE -Wno-deprecated)
+
+# specify libraries
+target_link_libraries(mp3_dt portaudio arduino_emulator arduino-audio-tools arduino_helix)
+

libraries/audio-tools/examples/examples-desktop/mp3/README.md

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+# Playing Sound on your Desktop
+
+We provide some generic output which will also work on Linux, Windows and OS/X
+The cmake is downloading all dependencies and builds an executable from the sketch.
+
+We use the more comprehensive new EncodedAudioStream class.
+
+You just need to provide an Arduino Sketch as cpp file. To build the example execute:
+
+```
+mkdir build
+cd build
+cmake ..
+make
+```
+

libraries/audio-tools/examples/examples-desktop/mp3/mp3.ino

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+// Simple wrapper for Arduino sketch to compilable with cpp in cmake
+#include "Arduino.h"
+#include "AudioTools.h"
+#include "BabyElephantWalk60_mp3.h"
+#include "AudioTools/AudioLibs/PortAudioStream.h"
+#include "AudioTools/AudioCodecs/CodecMP3Helix.h"
+
+
+MemoryStream mp3(BabyElephantWalk60_mp3, BabyElephantWalk60_mp3_len);
+PortAudioStream out;   // Output of sound on desktop 
+EncodedAudioStream dec(&out, new MP3DecoderHelix()); // MP3 data source
+StreamCopy copier(dec, mp3); // copy in to out
+
+void setup(){
+  Serial.begin(115200);
+  AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Info);  
+
+  out.begin();
+  mp3.begin();
+  dec.begin();
+}
+
+void loop(){
+  if (mp3) {
+    copier.copy();
+  } else {
+    auto info = dec.decoder().audioInfo();
+    LOGI("The audio rate from the mp3 file is %d", info.sample_rate);
+    LOGI("The channels from the mp3 file is %d", info.channels);
+    exit(0);
+  }
+}