codec_audio.h

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// SPDX-License-Identifier: AGPL-3.0-or-later
 
#ifndef __CODEC_AUDIO_H
#define __CODEC_AUDIO_H
 
#include <array>
#include <cstdint>
#include <mutex>
#include <vector>
 
extern "C" {
#include <libavcodec/avcodec.h>
#include <libavformat/avformat.h>
}
 
class cSoftHdAudio;
 
enum PassthroughMask {
    CODEC_AC3  = (1 << 2), 
    CODEC_EAC3 = (1 << 3), 
    CODEC_DTS  = (1 << 4), 
};
 
class cAudioDecoder {
public:
    cAudioDecoder(cSoftHdAudio *);
    ~cAudioDecoder(void);
    void Open(AVCodecID, AVCodecParameters * = nullptr, AVRational = { .num = 1, .den = 90000 });
    void Close(void);
    void Decode(const AVPacket *);
    void FlushBuffers(void);
    void SetPassthroughMask(int);
    AVCodecID GetCodecId() const { return m_codecId; };
 
private:
    cSoftHdAudio *m_pAudio;                     
    AVCodecContext *m_pAudioCtx = nullptr;      
    AVCodecID m_codecId = AV_CODEC_ID_NONE;     
    AVFrame *m_pFrame;                          
    int64_t m_lastPts = AV_NOPTS_VALUE;         
    int m_passthroughMask;                      
    int m_currentPassthroughMask;               
    int m_currentSampleRate;                    
    int m_currentNumChannels;                   
    int m_currentHwSampleRate;                  
    int m_currentHwNumChannels;                 
    std::mutex m_mutex;                         
 
    std::array<uint8_t, 32768> m_spdifIoBuffer; 
    AVFormatContext *m_spdifFmtCtx = nullptr;   
    std::vector<uint8_t> m_spdifOutputBuf;      
 
    constexpr static int AUDIO_PASSTHROUGH_NUM_CHANNELS = 2; 
    constexpr static int AUDIO_PASSTHROUGH_RATE_HZ = 48000;  
 
    bool OpenSpdifMuxer(AVCodecID, int);
    void CloseSpdifMuxer(void);
    const std::vector<uint8_t> &BuildIEC61937(const AVPacket *);
#if LIBAVFORMAT_VERSION_MAJOR >= 61
    static int SpdifWriteCallback(void *, const uint8_t *, int);
#else
    static int SpdifWriteCallback(void *, uint8_t *, int);
#endif
 
    bool ShouldTryPassthrough(void);
    int Passthrough(const AVPacket *);
    void DecodePCM(const AVPacket *);
    int CheckUpdateFormat(bool);
};
 
#endif