mgl_audio_wave_loader.h

[詳解]

// SPDX-License-Identifier: Zlib
/* ------------------------------------------------------------------------- */
/* ------------------------------------------------------------------------- */
 
#ifndef INCGUARD_MGL_AUDIO_WAVE_LOADER_H_1611731366
#define INCGUARD_MGL_AUDIO_WAVE_LOADER_H_1611731366
 
#include <mgl/file/mgl_file_throwing_handle.h>
 
namespace MGL::Audio
{
class WaveLoader
{
public:
    struct Format
    {
        uint16_t type;             
        uint16_t channelCount;     
        uint32_t samplesPerSec;    
        uint32_t bytesPerSec;      
        uint16_t blockSize;        
        uint16_t bitsPerSample;    
    };
    static_assert(sizeof(Format) == 16);
 
    /* ------------------------------------------------------------------------- */
    /* ------------------------------------------------------------------------- */
    [[nodiscard]] constexpr bool IsOpen() const noexcept
    {
        return _isOpen;
    }
 
    /* ------------------------------------------------------------------------- */
    /* ------------------------------------------------------------------------- */
    [[nodiscard]] constexpr const Format &GetFormat() const noexcept
    {
        return _format;
    }
 
    /* ------------------------------------------------------------------------- */
    /* ------------------------------------------------------------------------- */
    constexpr void Seek(uint32_t sampleFrame) noexcept
    {
        _currentDataOffset = static_cast<size_t>(sampleFrame) * _format.blockSize;
    }
 
    /* ------------------------------------------------------------------------- */
    /* ------------------------------------------------------------------------- */
    [[nodiscard]] constexpr bool IsFinished() const noexcept
    {
        return _currentDataOffset >= _dataSize;
    }
 
    /* ------------------------------------------------------------------------- */
    /* ------------------------------------------------------------------------- */
    [[nodiscard]] constexpr size_t GetDataSize() const noexcept
    {
        return _dataSize;
    }
 
    bool Open(const File::PathView &path) noexcept;
    void Close() noexcept;
 
    size_t GetSample(void *buffer, size_t bufferSize) noexcept;
    size_t GetSampleWithConvert(float *buffer, size_t bufferSize) noexcept;
 
private:
    bool _isOpen{false};
    Format _format{};
    File::ThrowingHandle _file;
    size_t _dataOffset{0};
    size_t _dataSize{0};
    size_t _currentDataOffset{0};
};
}    // namespace MGL::Audio
 
#endif    // INCGUARD_MGL_AUDIO_WAVE_LOADER_H_1611731366
 
// vim: et ts=4 sw=4 sts=4