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/**
@brief self-test encode and decode LTC
@file ltcloop.c
@author Robin Gareus <robin@gareus.org>
Copyright (C) 2006-2022 Robin Gareus <robin@gareus.org>
Copyright (C) 2008-2009 Jan <jan@geheimwerk.de>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser Public License as published by
the Free Software Foundation; either version 3, 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 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, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ltc.h>
int main(int argc, char **argv) {
double fps = 25;
double samplerate = 48000;
int vframe_cnt = 0;
int vframe_end = 1;
LTCEncoder* encoder = ltc_encoder_create (samplerate, fps, 0, 0);
ltc_encoder_set_filter(encoder, 0);
ltc_encoder_set_volume(encoder, -3.0);
int frame_size = ltc_encoder_get_buffersize (encoder) * sizeof (ltcsnd_sample_t);
ltcsnd_sample_t* buf = malloc ((1 + vframe_end) * frame_size);
/* Encode */
int off = 0;
for (vframe_cnt = 0; vframe_cnt < vframe_end; ++ vframe_cnt) {
ltc_encoder_encode_frame (encoder);
off += ltc_encoder_copy_buffer (encoder, &buf[off]);
ltc_encoder_inc_timecode (encoder);
}
/* finish frame */
ltc_encoder_end_encode (encoder);
off += ltc_encoder_copy_buffer (encoder, &buf[off]);
ltc_encoder_free(encoder);
#if 0
printf ("Encoded: %d [bytes]\n", off);
ltcsnd_sample_t last = 0;
for (int i = 0; i < off; ++i) {
if (buf[i] != last) {
printf ("%3d : %d\n", i, buf[i]);
last = buf[i];
}
}
#endif
/* Decode */
LTCDecoder* decoder = ltc_decoder_create(samplerate / fps, vframe_end);
LTCFrameExt frame;
ltc_decoder_write (decoder, buf, off, 0);
while (ltc_decoder_read (decoder, &frame)) {
SMPTETimecode stime;
ltc_frame_to_time (&stime, &frame.ltc, 0);
--vframe_cnt;
#if 0
printf("%02d:%02d:%02d%c%02d | %8lld %8lld%s\n",
stime.hours,
stime.mins,
stime.secs,
(frame.ltc.dfbit) ? '.' : ':',
stime.frame,
frame.off_start,
frame.off_end,
frame.reverse ? " R" : ""
);
#endif
}
ltc_decoder_free (decoder);
free (buf);
return vframe_cnt == 0 ? 0 : -1;
}
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