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61 lines
1.9 KiB
61 lines
1.9 KiB
/**********************************************************************
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Copyright (c) Microsoft Corporation 1994-1996. All Rights Reserved
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LtcDecode, Ken Greenebaum, November 1996
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**********************************************************************/
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#ifndef _H_LTCDECODER
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#define _H_LTCDECODER
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#include <wtypes.h>
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#include "timecode.h"
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typedef struct bitData {
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int value;
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LONGLONG sample;
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} foo;
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typedef struct LTCuserBits {
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int user1:4;
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int user2:4;
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int user3:4;
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int user4:4;
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int user5:4;
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int user6:4;
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int user7:4;
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int user8:4;
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} bar;
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class LTCdecoder {
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public:
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LTCdecoder(); // XXX really should spec format, rate...
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int decodeBuffer(short **buffer, int *bufferSize);
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int getTimeCode(TimeCode *tc); // convert LTC bits to SMPTE timecode
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int getUserBits(LTCuserBits *bits);
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int getStartStopSample(LONGLONG *start, LONGLONG *end);
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private:
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int _addBuffer(int bit, LONGLONG sample); // store the bit and detect sync
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int _bitWidth; // dynamicaly adjusted bit width
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int _sampleWidth; // length of the state we are sampling
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int _verticalEpsilon; // how close we have to be to the rail
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int _waveState; // high or low
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int _lastBit; // width of last bit (0-long, 1-short, 2-2nd short)
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// ring buffer
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bitData _ringBuffer[80];// this is where we keep our bits!
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int _bufferIndex;
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int _bitsRecorded; // total number of bits intered (morbid, eh?)
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LONGLONG _samplesProcessed; // number of audio samples processed
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int _validTimeCode; // set if the ringBuffer contains a timecode
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// sync detector
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int _onesCount; // track number of consequiative ones! (12==sync)
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LONGLONG _syncSample; // the sample corresponding to the LTC sync
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LONGLONG _endSample; // the sample corresponding to end of LTC
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};
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#endif /* _H_LTCDECODER */
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