Implement the "Mix audio with other apps" setting on Android.

Core/Config.cpp

@@ -825,6 +825,16 @@ std::string DefaultProAdhocServer() {
 	return "socom.cc";
 }
 
+bool DefaultAudioMixWithOthers() {
+#if PPSSPP_PLATFORM(IOS)
+	// On iOS, it's generally best to mix with others by default, since users expect that and the hardware is generally good enough to handle it.
+	return true;
+#else
+	// On Android, we historically took audio focus.
+	return false;
+#endif
+}
+
 static const ConfigSetting soundSettings[] = {
 	ConfigSetting("Enable", SETTING(g_Config, bEnableSound), true, CfgFlag::PER_GAME),
 	ConfigSetting("ExtraAudioBuffering", SETTING(g_Config, bExtraAudioBuffering), false, CfgFlag::DEFAULT),
@@ -850,7 +860,7 @@ static const ConfigSetting soundSettings[] = {
 
 	ConfigSetting("AudioDevice", SETTING(g_Config, sAudioDevice), "", CfgFlag::DEFAULT),
 	ConfigSetting("AutoAudioDevice", SETTING(g_Config, bAutoSwitchAudioDevice), true, CfgFlag::DEFAULT),
-	ConfigSetting("AudioMixWithOthers", SETTING(g_Config, bAudioMixWithOthers), true, CfgFlag::DEFAULT),
+	ConfigSetting("AudioMixWithOthers", SETTING(g_Config, bAudioMixWithOthers), &DefaultAudioMixWithOthers, CfgFlag::DEFAULT),
 	ConfigSetting("AudioRespectSilentMode", SETTING(g_Config, bAudioRespectSilentMode), false, CfgFlag::DEFAULT),
 	ConfigSetting("UseOldAtrac", SETTING(g_Config, bUseOldAtrac), false, CfgFlag::DEFAULT),
 };