ltcencoder.h

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#pragma once
 
 
#include <promeki/config.h>
#if PROMEKI_ENABLE_PROAV
#include <promeki/framerate.h>
#include <promeki/list.h>
#include <promeki/namespace.h>
#include <promeki/timecode.h>
#include <promeki/uniqueptr.h>
#include <vtc/ltc_audio.h>
 
PROMEKI_NAMESPACE_BEGIN
 
class LtcEncoder {
        public:
                using UPtr = UniquePtr<LtcEncoder>;
 
                LtcEncoder(int sampleRate, const FrameRate &frameRate, float level = 0.5f);
 
                ~LtcEncoder() = default;
 
                LtcEncoder(const LtcEncoder &) = delete;
                LtcEncoder &operator=(const LtcEncoder &) = delete;
                LtcEncoder(LtcEncoder &&) = default;
                LtcEncoder &operator=(LtcEncoder &&) = default;
 
                int sampleRate() const { return _encoder.sample_rate; }
 
                FrameRate frameRate() const { return _frameRate; }
 
                float level() const { return _encoder.level; }
 
                void setLevel(float level);
 
                List<int8_t> encode(const Timecode &tc);
 
                void resetSlicing();
 
                size_t frameSizeApprox(const VtcFormat *format) const;
 
        private:
                VtcLTCEncoder _encoder;
                FrameRate     _frameRate;
 
                // Chunked-emission state (active only when _frameRate.isValid()).
                // _codewordBuf holds the most recent full libvtc codeword's audio;
                // _codewordCursor counts samples already emitted from it.  The
                // sample-count counters track exact long-term emission to avoid
                // rounding drift at NTSC fractional rates.
                List<int8_t> _codewordBuf;
                size_t       _codewordCursor = 0;
                int64_t      _videoFramesEmitted = 0;
                int64_t      _samplesEmittedTotal = 0;
};
 
PROMEKI_NAMESPACE_END
 
#endif // PROMEKI_ENABLE_PROAV