axmol/cocos/audio/include/AudioDecoderWav.h

/****************************************************************************
 Copyright (c) 2016 Chukong Technologies Inc.
 Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.
 Copyright (c) 2018 HALX99.

 http://www.cocos2d-x.org

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 all copies or substantial portions of the Software.

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 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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#pragma once

#include "audio/include/AudioDecoder.h"
#include "platform/PXFileStream.h"

#pragma pack(push,1)
// http://soundfile.sapp.org/doc/WaveFormat/
struct WAV_FILE_HEADER {
    uint32_t ChunkID;
    uint32_t ChunkSize;
    uint32_t Format;
    uint32_t Subchunk1ID;
    uint32_t Subchunk1Size;
    uint16_t AudioFormat;
    uint16_t NumChannels;
    uint32_t SampleRate;
    uint32_t ByteRate;
    uint16_t BlockAlign;
    uint16_t BitsPerSample;
    uint32_t Subchunk2ID;
    uint32_t Subchunk2Size;
};
#pragma pack(pop)

struct WAV_FILE
{
    WAV_FILE_HEADER FileHeader;
    uint32_t PcmDataOffset;
    uint32_t BytesPerFrame;
    uint16_t ExtraParamSize;
    uint32_t Samples;
    uint32_t ChannelMask;
    cocos2d::PXFileStream FileStream;
};

namespace cocos2d {

/**
 * @brief The class for decoding compressed audio file to PCM buffer.
 */
class AudioDecoderWav : public AudioDecoder
{
public:
    /**
     * @brief Opens an audio file specified by a file path.
     * @return true if succeed, otherwise false.
     */
    virtual bool open(const std::string& 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:
    AudioDecoderWav();
    ~AudioDecoderWav();

    mutable WAV_FILE _wavf;
    friend class AudioDecoderManager;
};

} // namespace cocos2d {