Audio: Add mp3 support + new demo

examples/PlayMusic/main.cpp

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+/*
+** DopplerEffect - Introduction à la lecture de son spatialisé (+ démonstration de l'effet doppler)
+** Prérequis: Aucun
+** Utilisation du noyau et du module audio
+** Présente:
+** - Chargement, lecture et positionnement d'un son
+** - Gestion basique d'une horloge
+** - Gestion basique de position 3D
+*/
+
+#include <Nazara/Audio.hpp>
+#include <Nazara/Core/Clock.hpp>
+#include <Nazara/Core/Modules.hpp>
+#include <Nazara/Math/Vector3.hpp>
+#include <Nazara/Platform/Keyboard.hpp>
+#include <Nazara/Platform/Platform.hpp>
+#include <chrono>
+#include <iostream>
+#include <thread>
+
+int main()
+{
+	std::filesystem::path resourceDir = "resources";
+	if (!std::filesystem::is_directory(resourceDir) && std::filesystem::is_directory(".." / resourceDir))
+		resourceDir = ".." / resourceDir;
+
+	Nz::Modules<Nz::Audio> audio;
+
+	Nz::SoundStreamParams streamParams;
+	streamParams.forceMono = false;
+
+	Nz::Music music;
+	if (!music.OpenFromFile(resourceDir / "file_example_MP3_700KB.mp3", streamParams))
+	{
+		std::cout << "Failed to load sound" << std::endl;
+		std::getchar();
+		return EXIT_FAILURE;
+	}
+
+	music.Play();
+
+	std::cout << "Playing sound..." << std::endl;
+
+	while (music.IsPlaying())
+		std::this_thread::sleep_for(std::chrono::milliseconds(100));
+
+	return EXIT_SUCCESS;
+}

examples/PlayMusic/xmake.lua

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+target("PlayMusic")
+	set_group("Examples")
+	set_kind("binary")
+	add_deps("NazaraAudio")
+	add_files("main.cpp")