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

 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
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 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,
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 THE SOFTWARE.
 ****************************************************************************/

#pragma once

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

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 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;
    uint32_t PcmDataOffset;
    uint32_t BytesPerFrame;
    PCM_FORMAT PcmFormat;
    uint16_t ExtraParamSize; // unused
    uint32_t Samples; // unused
    uint32_t ChannelMask; // unused
    cocos2d::PXFileStream 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.
     */
    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 {