decoder.h

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/*
   libltc - en+decode linear timecode
 
   Copyright (C) 2006-2012 Robin Gareus <robin@gareus.org>
 
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU Lesser General Public License as
   published by the Free Software Foundation, either version 3 of the
   License, or (at your option) any later version.
 
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU Lesser General Public License for more details.
 
   You should have received a copy of the GNU Lesser General Public
   License along with this library.
   If not, see <http://www.gnu.org/licenses/>.
*/
 
#include "ltc/ltc.h"
#ifndef SAMPLE_CENTER // also defined in encoder.h
#define SAMPLE_CENTER 128 // unsigned 8 bit.
#endif
 
struct LTCDecoder {
        LTCFrameExt* queue;
        int queue_len;
        int queue_read_off;
        int queue_write_off;
 
        unsigned char biphase_state;
        unsigned char biphase_prev;
        unsigned char snd_to_biphase_state;
        int snd_to_biphase_cnt;         
        int snd_to_biphase_lmt; 
        double snd_to_biphase_period;   
 
        ltcsnd_sample_t snd_to_biphase_min;
        ltcsnd_sample_t snd_to_biphase_max;
 
        unsigned short decoder_sync_word;
        LTCFrame ltc_frame;
        int bit_cnt;
 
        ltc_off_t frame_start_off;
        ltc_off_t frame_start_prev;
 
        float biphase_tics[LTC_FRAME_BIT_COUNT];
        int biphase_tic;
};
 
 
void decode_ltc(LTCDecoder *d, ltcsnd_sample_t *sound, size_t size, ltc_off_t posinfo);