codec_audio.h

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#ifndef __CODEC_AUDIO_H
#define __CODEC_AUDIO_H
 
#include <cstdint>
 
extern "C" {
#include <libavcodec/avcodec.h>
}
 
#define CODEC_AC3  0x04      
#define CODEC_EAC3 0x08      
#define CODEC_DTS  0x10      
 
enum IEC61937
{
    IEC61937_NULL = 0x00,      
    IEC61937_AC3 = 0x01,       
    IEC61937_EAC3 = 0x15,      
    IEC61937_DTS1 = 0x0B,      
    IEC61937_DTS2 = 0x0C,      
    IEC61937_DTS3 = 0x0D,      
    IEC61937_DTSHD = 0x11,     
    IEC61937_TRUEHD = 0x16,    
};
 
#define IEC61937_PREAMBLE1      0xF872
#define IEC61937_PREAMBLE2      0x4E1F
#define DTS_PREAMBLE_16BE_1     0x7FFE
#define DTS_PREAMBLE_16BE_2     0x8001
 
#define DTS1_FRAME_SIZE          512
#define DTS2_FRAME_SIZE         1024
#define DTS3_FRAME_SIZE         2048
#define AC3_FRAME_SIZE          1536
#define EAC3_FRAME_SIZE         6144
#define TRUEHD_FRAME_SIZE      15360    
 
#define MAX_FRAME_SIZE EAC3_FRAME_SIZE
 
class cSoftHdAudio;
 
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 SetPassthrough(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_currentPassthrough;                   
    int m_currentSampleRate;                    
    int m_currentNumChannels;                   
    int m_currentHwSampleRate;                  
    int m_currentHwNumChannels;                 
    uint16_t m_spdifOutput[MAX_FRAME_SIZE * 2]; 
    int m_spdifIndex;                           
    int m_spdifRepeatCount;                     
 
    int DecodePassthrough(const AVPacket *, AVFrame *);
    int UpdateFormat(void);
};
 
#endif