FFmpegAudioDecoder.h

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#pragma once
#include "HephAudioShared.h"
#include "FFmpegAudioShared.h"
#include "IAudioDecoder.h"
#include "FFmpegEncodedAudioBuffer.h"
 
namespace HephAudio
{
    class HEPH_API FFmpegAudioDecoder final : public IAudioDecoder
    {
    private:
        static constexpr size_t AUDIO_STREAM_INDEX_NOT_FOUND = -1;
 
    private:
        size_t fileDuration_frame;
        size_t audioStreamIndex;
        int64_t firstPacketPts;
        AVFormatContext* avFormatContext;
        AVCodecContext* avCodecContext;
        SwrContext* swrContext;
        AVFrame* avFrame;
        AVPacket* avPacket;
 
    public:
        FFmpegAudioDecoder();
 
        FFmpegAudioDecoder(const std::filesystem::path& filePath);
 
        FFmpegAudioDecoder(FFmpegAudioDecoder&& rhs) noexcept;
 
        FFmpegAudioDecoder(const FFmpegAudioDecoder&) = delete;
 
        ~FFmpegAudioDecoder();
        
        FFmpegAudioDecoder& operator=(const FFmpegAudioDecoder&) = delete;
        FFmpegAudioDecoder& operator=(FFmpegAudioDecoder&& rhs) noexcept;
        void ChangeFile(const std::filesystem::path& newFilePath) override;
        void CloseFile() override;
        bool IsFileOpen() const override;
        AudioFormatInfo GetOutputFormatInfo() const override;
        size_t GetFrameCount() const override;
        bool Seek(size_t frameIndex) override;
        AudioBuffer Decode() override;
        AudioBuffer Decode(size_t frameCount) override;
        AudioBuffer Decode(size_t frameIndex, size_t frameCount) override;
        AudioBuffer Decode(const EncodedAudioBuffer& encodedBuffer) override;
 
    private:
        void OpenFile(const std::filesystem::path& filePath);
        int SeekFrame(size_t& frameIndex);
    };
}