audiooutputdigitalencoder.h

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#ifndef AUDIOOUTPUTREENCODER
#define AUDIOOUTPUTREENCODER
 
extern "C" {
#include "libavcodec/avcodec.h"
};
 
#include "spdifencoder.h"
#include "audiooutputsettings.h"
 
static constexpr ssize_t INBUFSIZE  {    131072 };
static constexpr ssize_t OUTBUFSIZE { INBUFSIZE };
 
class AudioOutputDigitalEncoder
{
 
  public:
    AudioOutputDigitalEncoder(void);
    ~AudioOutputDigitalEncoder();
 
    bool   Init(AVCodecID codec_id, int bitrate, int samplerate, int channels);
    int Encode(void *input, int len, AudioFormat format);
    int GetFrames(void *ptr, int maxlen);
    int    Buffered(void) const
    // assume 32 bit samples = 4 byte
    { return m_inlen / 4 / m_avContext->ch_layout.nb_channels; }
    void    clear();
 
  private:
    void   Reset(void);
    static void *realloc(void *ptr, size_t old_size, size_t new_size);
 
    AVCodecContext *m_avContext         {nullptr};
    uint8_t        *m_outbuf            {nullptr};
    ssize_t         m_outSize           {0};
    // m_inbuf  = 6 channel data converted to S32 or FLT samples interleaved
    uint8_t        *m_inbuf             {nullptr};
    // m_framebuf = 1 frame, deinterleaved into planar format
    uint8_t        *m_framebuf          {nullptr};
    ssize_t         m_inSize            {0};
    int             m_outlen            {0};
    // m_inlen = number of bytes available in m_inbuf
    int             m_inlen             {0};
    int             m_samplesPerFrame   {0};
    SPDIFEncoder   *m_spdifEnc          {nullptr};
    AVFrame        *m_frame             {nullptr};
};
 
#endif