pc_tiantian/core/luaScript/Tools/MusicPlayer.lua

return function()
	-- 当前正在播放的背景音乐
	local currentBGPlayer;
	local currentBGMusic;
	local currentBGDelay;
	local currentPlayConfig;
	local bindSoundIndex;

	-- 强制停止当前背景音乐
	local function _stopCustomMusic()
		if currentBGPlayer then
			-- 停止计时
			currentBGPlayer:cancelTimer();
			-- 淡出
			if not tolua.isnull(currentBGMusic) then
				local timerId;
				local fadeOutTime = currentBGPlayer:getConfig().FadeOut;
				local sound = currentBGMusic;
				if fadeOutTime <= 0 then
					if not tolua.isnull(sound) then
						--print("停止音乐" , debug.traceback());
						cc.AudioController:getInstance():stopSound(sound);
					end
				else
					local function interpolate(from , to , t)
						-- SINE_IN_OUT
						t = -0.5 * (math.cos(math.pi * t) - 1.0);
						return from + (to - from) * t;
					end

					local fromGain = sound:getGain();

					local offset = 0;
					local function update(dt)
						offset = offset + dt;
						if offset >= fadeOutTime then
							cc.Director:getInstance():getScheduler():unscheduleScriptEntry(timerId);
							if not tolua.isnull(sound) then
								--print("停止音乐" , debug.traceback());
								cc.AudioController:getInstance():stopSound(sound);
							end
						end
						if not tolua.isnull(sound) then
							local gain = interpolate(fromGain , 0 , offset / fadeOutTime);
							sound:setGain(gain);
						else
							cc.Director:getInstance():getScheduler():unscheduleScriptEntry(timerId);
						end
					end

					-- 一段时间检测一下
					timerId = cc.Director:getInstance():getScheduler():scheduleScriptFunc(update, 0, false);
				end
			end
			-- 结束
			currentBGPlayer = nil;
			-- 清空下配置
			--currentPlayConfig = nil
		end
		currentBGMusic = nil;
	end

	-- 播放背景音乐
	--[[
		-- 保存所有配置
		playConfig = 
		{
			-- 唯一的名字，如果正在播的是这个名字，就忽略
			Name = "login";
			-- 需要播放的声音列表，会从中随机一首
			Files = {"res/sound/BW/BW1.ogg" , "res/sound/BW/BW2.ogg"};
			-- 播放几率，[0-100]
			Rate = 100;
			-- 每批的间隔
			IntervalMin = 0;
			IntervalMax = 0;
			-- 一批播放多少次
			PlayCountMin = 1;
			PlayCountMax = 1;
			-- 循环多少批，0表示无限循环
			LoopCount = 1;
			-- 延迟几秒才开始播放
			DelayTime = 3;
			-- 声音停止时的淡出时间（秒）
			FadeOut = 3;
		}
	--]]
	-- 播放音乐
	local function _playCustomMusic(playConfig)
		-- 先停止音乐
		_stopCustomMusic();
		-- 停止音乐
		local function stop()
			if not tolua.isnull(currentBGMusic) then
				--print("停止音乐" , debug.traceback());
				cc.AudioController:getInstance():stopSound(currentBGMusic);
			end
			currentBGMusic = nil;
		end
		-- 播放音乐
		local function play()
			stop();
			local filePath = playConfig.Files[math.random(1 , #playConfig.Files)];
			--print("播放音乐" , debug.traceback());
			cc.AudioController:getInstance():setPlaySound(true)
			currentBGMusic = cc.AudioController:getInstance():playSound(filePath , true);
			cc.AudioController:getInstance():setPlaySound(app.systemSetting.info.sound)
			-- currentBGMusic 如果为空直接返回
			if not currentBGMusic then 
				return 	
			end
			
			local musicVolume = app.systemSetting.info.musicVolume
			currentBGMusic:setGain(musicVolume)
			
			currentBGMusic:play();

			local function onEvent(state)
				-- 结束通知
				if state == 3 and currentBGMusic then
					currentBGMusic = nil;
					currentBGPlayer:onPlayEnd();
				end
			end
			currentBGMusic:addListener(onEvent);
		end
		
		currentBGPlayer = cc.RandomPlayer:new();
		currentBGPlayer:setPlayFunc(play);
		currentBGPlayer:setStopFunc(stop);
		-- 配置(播放音乐必须的配置)
		currentBGPlayer:setConfig(playConfig);
		-- 开始播放
		currentBGPlayer:start(app.mainScene);
	end
	
	
	-- 停止背景音乐
	local function stopBGMusic()
		-- 取消延迟
		if currentBGDelay then
			currentBGDelay();
			currentBGDelay = nil;
		end
		
		if bindSoundIndex then
			app.mainScene:unbind(app.systemSetting.info, "music", bindSoundIndex);
			bindSoundIndex = nil;
		end
		_stopCustomMusic();
	end	
	-- 播放背景音乐
	local function playBGMusic(playConfig)
		-- 如果当前正在播放，且声音相同，就忽略
		if currentBGPlayer and currentPlayConfig and currentPlayConfig.Name == playConfig.Name then
			return;
		end
		
		-- 先停止音乐
		stopBGMusic()
		local isTest = false;
		if not isTest then
			playConfig.IntervalMax = math.max(playConfig.IntervalMin , playConfig.IntervalMax);
			playConfig.PlayCountMax = math.max(playConfig.PlayCountMin , playConfig.PlayCountMax);
			-- LUA层的配置
			currentPlayConfig = playConfig
			-- 开始播放音乐
			local function onMusicSettingChanged(key , value)
				if not value then
					-- 停止当前音乐
					_stopCustomMusic()
				else
					-- 如果已经开放播放了则不需要播放了
					if not currentBGPlayer and currentPlayConfig then
						_playCustomMusic(currentPlayConfig)
					end
				end
			end
			
			local function onMusicVolumeChanged(key, value)
				local musicVolume = app.systemSetting.info.musicVolume
				if currentBGMusic then
					currentBGMusic:setGain(musicVolume)	
				end
			end
			
			-- 开始播放音乐
			local function start()
				currentBGDelay = nil;
				bindSoundIndex = app.mainScene:bind(app.systemSetting.info, "music" , onMusicSettingChanged);
				
				app.mainScene:bind(app.systemSetting.info, "musicVolume", onMusicVolumeChanged)
			end
			
			-- 没有延迟立马开始
			if playConfig.DelayTime == nil or playConfig.DelayTime <= 0 then
				start();
			else
				currentBGDelay = runDelay(playConfig.DelayTime, start);
			end
		end
	end
	
	return { playBGMusic = playBGMusic , stopBGMusic = stopBGMusic};
end;