初始化

cocos2d-x/cocos/audio/apple/AudioCache.h

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+/****************************************************************************
+ Copyright (c) 2014-2016 Chukong Technologies Inc.
+ Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.
+
+ http://www.cocos2d-x.org
+
+ Permission is hereby granted, free of charge, to any person obtaining a copy
+ of this software and associated documentation files (the "Software"), to deal
+ in the Software without restriction, including without limitation the rights
+ to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ copies of the Software, and to permit persons to whom the Software is
+ furnished to do so, subject to the following conditions:
+
+ The above copyright notice and this permission notice shall be included in
+ all copies or substantial portions of the Software.
+
+ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ THE SOFTWARE.
+ ****************************************************************************/
+
+#pragma once
+
+#include "platform/CCPlatformConfig.h"
+#if CC_TARGET_PLATFORM == CC_PLATFORM_IOS || CC_TARGET_PLATFORM == CC_PLATFORM_MAC
+
+#import <OpenAL/al.h>
+
+#include <string>
+#include <mutex>
+#include <vector>
+
+#include "base/ccMacros.h"
+#include "audio/apple/AudioMacros.h"
+
+NS_CC_BEGIN
+class AudioEngineImpl;
+class AudioPlayer;
+
+class AudioCache
+{
+public:
+
+    enum class State
+    {
+        INITIAL,
+        LOADING,
+        READY,
+        FAILED
+    };
+
+    AudioCache();
+    ~AudioCache();
+
+    void addPlayCallback(const std::function<void()>& callback);
+
+    void addLoadCallback(const std::function<void(bool)>& callback);
+
+protected:
+    void setSkipReadDataTask(bool isSkip) { _isSkipReadDataTask = isSkip; };
+    void readDataTask(unsigned int selfId);
+
+    void invokingPlayCallbacks();
+
+    void invokingLoadCallbacks();
+
+    //pcm data related stuff
+    ALenum _format;
+    ALsizei _sampleRate;
+    float _duration;
+    uint32_t _totalFrames;
+    uint32_t _framesRead;
+
+    /*Cache related stuff;
+     * Cache pcm data when sizeInBytes less than PCMDATA_CACHEMAXSIZE
+     */
+    ALuint _alBufferId;
+    char* _pcmData;
+
+    /*Queue buffer related stuff
+     *  Streaming in openal when sizeInBytes greater then PCMDATA_CACHEMAXSIZE
+     */
+    char* _queBuffers[QUEUEBUFFER_NUM];
+    ALsizei _queBufferSize[QUEUEBUFFER_NUM];
+    uint32_t _queBufferFrames;
+
+    std::mutex _playCallbackMutex;
+    std::vector< std::function<void()> > _playCallbacks;
+
+    // loadCallbacks doesn't need mutex since it's invoked only in Cocos thread.
+    std::vector< std::function<void(bool)> > _loadCallbacks;
+
+    std::mutex _readDataTaskMutex;
+
+    State _state;
+
+    std::shared_ptr<bool> _isDestroyed;
+    std::string _fileFullPath;
+    unsigned int _id;
+    bool _isLoadingFinished;
+    bool _isSkipReadDataTask;
+
+    friend class AudioEngineImpl;
+    friend class AudioPlayer;
+};
+
+NS_CC_END
+
+#endif