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cocos2d-x/cocos/audio/win32/AudioDecoderMp3.h

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+/****************************************************************************
+ Copyright (c) 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 "audio/win32/AudioDecoder.h"
+
+struct mpg123_handle_struct;
+
+namespace cocos2d { 
+
+/**
+ * @brief The class for decoding compressed audio file to PCM buffer.
+ */
+class AudioDecoderMp3 : public AudioDecoder
+{
+public:
+    /**
+     * @brief Opens an audio file specified by a file path.
+     * @return true if succeed, otherwise false.
+     */
+    virtual bool open(const char* path) override;
+
+    /**
+     * @brief Closes opened audio file.
+     * @note The method will also be automatically invoked in the destructor.
+     */
+    virtual void close() override;
+
+    /**
+     * @brief Reads audio frames of PCM format.
+     * @param framesToRead The number of frames excepted to be read.
+     * @param pcmBuf The buffer to hold the frames to be read, its size should be >= |framesToRead| * _bytesPerFrame.
+     * @return The number of frames actually read, it's probably less than 'framesToRead'. Returns 0 means reach the end of file.
+     */
+    virtual uint32_t read(uint32_t framesToRead, char* pcmBuf) override;
+
+    /**
+     * @brief Sets frame offest to be read.
+     * @param frameOffset The frame offest to be set.
+     * @return true if succeed, otherwise false
+     */
+    virtual bool seek(uint32_t frameOffset) override;
+
+    /**
+     * @brief Tells the current frame offset.
+     * @return The current frame offset.
+     */
+    virtual uint32_t tell() const override;
+
+protected:
+
+    AudioDecoderMp3();
+    ~AudioDecoderMp3();
+
+    static bool lazyInit();
+    static void destroy();
+
+    struct mpg123_handle_struct* _mpg123handle;
+
+    friend class AudioDecoderManager;
+};
+
+} // namespace cocos2d {