axmol/cocos/audio/include/AudioDecoderWav.h

/****************************************************************************
 Copyright (c) 2016 Chukong Technologies Inc.
 Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.
 Copyright (c) 2018-2019 HALX99.
 Copyright (c) 2020 c4games.com.

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#pragma once

#include "audio/include/AudioDecoder.h"

#if !defined(MAKE_FOURCC)
#define MAKE_FOURCC(a,b,c,d) ((uint32_t)((a) | ((b) << 8) | ((c) << 16) | (((uint32_t)(d)) << 24)))
#endif

#if !defined(_WIN32)
typedef struct _GUID {
    unsigned long  Data1;
    unsigned short Data2;
    unsigned short Data3;
    unsigned char  Data4[8];
} GUID;
__inline int IsEqualGUID(const GUID& rguid1, const GUID& rguid2)
{
    return !::memcmp(&rguid1, &rguid2, sizeof(GUID));
}
#endif

namespace cocos2d {

// http://soundfile.sapp.org/doc/WaveFormat/
enum class WAV_FORMAT : uint16_t
{
    UNKNOWN = 0x0,       // Unknown Wave Format
    PCM = 0x1,           // PCM Format
    ADPCM = 0x2,         // Microsoft ADPCM Format
    IEEE = 0x3,          // IEEE float/double
    ALAW = 0x6,          // 8-bit ITU-T G.711 A-law
    MULAW = 0x7,         // 8-bit ITU-T G.711 MUL-law
    IMA_ADPCM = 0x11,    // IMA ADPCM Format
    EXT = 0xFFFE         // Set via subformat
};

#pragma pack(push,1)
struct WAV_CHUNK_HEADER {
    uint32_t ChunkID;
    /*
    ** The ChunkSize gives the size of the valid data in the chunk. It does not include the padding, the size of chunkID, or the size of chunkSize.
    ** see: https://docs.microsoft.com/en-us/windows/win32/xaudio2/resource-interchange-file-format--riff-
    */
    uint32_t ChunkSize;
};
struct WAV_RIFF_CHUNK {
    WAV_CHUNK_HEADER Header;
    uint32_t Format;
};
struct WAV_FMT_CHUNK {
    WAV_CHUNK_HEADER Header;
    WAV_FORMAT AudioFormat;
    uint16_t NumChannels;
    uint32_t SampleRate;
    uint32_t ByteRate;
    uint16_t BlockAlign;
    uint16_t BitsPerSample;
    struct {
        /* The follow fields is optional */
        uint16_t cbSize;
        union {
            uint16_t ValidBitsPerSample;
            uint16_t SamplesPerBlock;
            uint16_t Reserved;
        } Samples;
        uint32_t     ChannelMask;
        GUID         SubFormat;
    } ExtParams;
};
struct WAV_FILE_HEADER {
    WAV_RIFF_CHUNK Riff;
    WAV_FMT_CHUNK Fmt;
    WAV_CHUNK_HEADER PcmData;
};
#pragma pack(pop)

struct WAV_FILE
{
    WAV_FILE_HEADER FileHeader;
    AUDIO_SOURCE_FORMAT SourceFormat;
    uint32_t PcmDataOffset;
    cocos2d::FileStream Stream;
};


/**
 * @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.
     */
    bool open(const std::string& path) override;

    /**
    * @brief The helper function for convert frames to bytes
    */
    uint32_t framesToBytes(uint32_t frames) const override;

    /**
    * @brief The helper function for convert bytes to frames
    */
    uint32_t bytesToFrames(uint32_t bytes) const override;

    /**
     * @brief Closes opened audio file.
     * @note The method will also be automatically invoked in the destructor.
     */
    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| / samplesPerBlock * _bytesPerBlock.
     * @return The number of frames actually read, it's probably less than 'framesToRead'. Returns 0 means reach the end of file.
     */
    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
     */
    bool seek(uint32_t frameOffset) override;

protected:

    friend class AudioDecoderManager;
    AudioDecoderWav();
    ~AudioDecoderWav();

    mutable WAV_FILE _wavf;
};

} // namespace cocos2d {