using namespace std;
using namespace ARDOUR;
-using namespace MIDI;
using namespace PBD;
using namespace Timecode;
* This filter is adaptive so that fast vari-speed signals
* will not be affected by it.
*/
-#define LTC_RISE_TIME(speed) MIN (100, MAX(25, (4000000 / ((speed==0)?1:speed) / engine().frame_rate())))
+#define LTC_RISE_TIME(speed) MIN (100, MAX(40, (4000000 / ((speed==0)?1:speed) / engine().frame_rate())))
+
+#define TV_STANDARD(tcf) \
+ (timecode_to_frames_per_second(tcf)==25.0 ? LTC_TV_625_50 : \
+ timecode_has_drop_frames(tcf)? LTC_TV_525_60 : LTC_TV_FILM_24)
void
Session::ltc_tx_initialize()
{
ltc_enc_tcformat = config.get_timecode_format();
+ ltc_tx_parse_offset();
DEBUG_TRACE (DEBUG::LTC, string_compose("LTC TX init sr: %1 fps: %2\n", nominal_frame_rate(), timecode_to_frames_per_second(ltc_enc_tcformat)));
ltc_encoder = ltc_encoder_create(nominal_frame_rate(),
timecode_to_frames_per_second(ltc_enc_tcformat),
- -2);
+ TV_STANDARD(ltc_enc_tcformat), 0);
ltc_encoder_set_bufsize(ltc_encoder, nominal_frame_rate(), 23.0);
ltc_encoder_set_filter(ltc_encoder, LTC_RISE_TIME(1.0));
ltc_tx_resync_latency();
Xrun.connect_same_thread (*this, boost::bind (&Session::ltc_tx_reset, this));
engine().GraphReordered.connect_same_thread (*this, boost::bind (&Session::ltc_tx_resync_latency, this));
+ restarting = false;
}
void
Session::ltc_tx_cleanup()
{
DEBUG_TRACE (DEBUG::LTC, "LTC TX cleanup\n");
- if (ltc_enc_buf) free(ltc_enc_buf);
+ free(ltc_enc_buf);
+ ltc_enc_buf = NULL;
ltc_encoder_free(ltc_encoder);
ltc_encoder = NULL;
}
ltc_encoder_reset(ltc_encoder);
}
+void
+Session::ltc_tx_parse_offset() {
+ Timecode::Time offset_tc;
+ Timecode::parse_timecode_format(config.get_timecode_generator_offset(), offset_tc);
+ offset_tc.rate = timecode_frames_per_second();
+ offset_tc.drop = timecode_drop_frames();
+ timecode_to_sample(offset_tc, ltc_timecode_offset, false, false);
+ ltc_timecode_negative_offset = !offset_tc.negative;
+}
+
void
Session::ltc_tx_recalculate_position()
{
Timecode::timecode_to_sample (a3tc, ltc_enc_pos, true, false,
(double)frame_rate(),
config.get_subframes_per_frame(),
- config.get_timecode_offset_negative(), config.get_timecode_offset()
+ ltc_timecode_negative_offset, ltc_timecode_offset
);
+ restarting = false;
}
void
TimecodeFormat cur_timecode = config.get_timecode_format();
if (cur_timecode != ltc_enc_tcformat) {
DEBUG_TRACE (DEBUG::LTC, string_compose("LTC TX1: TC format mismatch - reinit sr: %1 fps: %2\n", nominal_frame_rate(), timecode_to_frames_per_second(cur_timecode)));
- if (ltc_encoder_reinit(ltc_encoder, nominal_frame_rate(), timecode_to_frames_per_second(cur_timecode), -2)) {
+ if (ltc_encoder_reinit(ltc_encoder, nominal_frame_rate(),
+ timecode_to_frames_per_second(cur_timecode),
+ TV_STANDARD(cur_timecode), 0
+ )) {
PBD::error << _("LTC encoder: invalid framerate - LTC encoding is disabled for the remainder of this session.") << endmsg;
ltc_tx_cleanup();
return;
}
ltc_encoder_set_filter(ltc_encoder, LTC_RISE_TIME(ltc_speed));
ltc_enc_tcformat = cur_timecode;
+ ltc_tx_parse_offset();
ltc_tx_reset();
}
*/
framepos_t cycle_start_frame = (current_speed < 0) ? (start_frame - ltc_out_latency.max) : (start_frame + ltc_out_latency.max);
+ /* LTC TV standard offset */
+ cycle_start_frame -= ltc_frame_alignment(frames_per_timecode_frame(), TV_STANDARD(cur_timecode));
+
/* cycle-start may become negative due to latency compensation */
if (cycle_start_frame < 0) { cycle_start_frame = 0; }
timecode_drop_frames(),
(double)frame_rate(),
config.get_subframes_per_frame(),
- config.get_timecode_offset_negative(), config.get_timecode_offset()
+ ltc_timecode_negative_offset, ltc_timecode_offset
);
/* convert timecode back to sample-position */
Timecode::timecode_to_sample (tc_start, tc_sample_start, true, false,
(double)frame_rate(),
config.get_subframes_per_frame(),
- config.get_timecode_offset_negative(), config.get_timecode_offset()
+ ltc_timecode_negative_offset, ltc_timecode_offset
);
/* difference between current frame and TC frame in samples */
maxdiff = slave()->resolution();
} else {
maxdiff = ceil(fabs(ltc_speed))*2.0;
+ if (nominal_frame_rate() != frame_rate()) {
+ maxdiff *= 3.0;
+ }
+ if (ltc_enc_tcformat == Timecode::timecode_23976 || ltc_enc_tcformat == Timecode::timecode_24976) {
+ maxdiff *= 15.0;
+ }
}
DEBUG_TRACE (DEBUG::LTC, string_compose("LTC TX4: enc: %1 + %2 - %3 || buf-bytes: %4 enc-byte: %5\n",
DEBUG_TRACE (DEBUG::LTC, string_compose("LTC TX5 restart encoder: soff %1 byte %2 cycoff %3\n",
soff, ltc_enc_byte, cyc_off));
+ if ( (ltc_speed < 0 && ltc_enc_byte !=9 ) || (ltc_speed >= 0 && ltc_enc_byte !=0 ) ) {
+ restarting = true;
+ }
+
if (cyc_off > 0 && cyc_off <= nframes) {
/* offset in this cycle */
txf= rint(cyc_off / fabs(ltc_speed));
/* reduce (low freq) jitter.
* The granularity of the LTC encoder speed is 1 byte =
* (frames-per-timecode-frame / 10) audio-samples.
- * Thus, tiny speed changes [as produced by the slave]
+ * Thus, tiny speed changes [as produced by some slaves]
* may not have any effect in the cycle when they occur,
* but they will add up over time.
*
- * This is a linear approx to compensate for this drift
+ * This is a linear approx to compensate for this jitter
* and prempt re-sync when the drift builds up.
*
* However, for very fast speeds - when 1 LTC bit is
}
}
- if (ltc_encoder_encode_byte(ltc_encoder, ltc_enc_byte, (ltc_speed==0)?1.0:(1.0/ltc_speed))) {
- DEBUG_TRACE (DEBUG::LTC, string_compose("LTC TX6.3 encoder error byte %1\n", ltc_enc_byte));
- ltc_encoder_buffer_flush(ltc_encoder);
- ltc_tx_reset();
- return;
+ int enc_frames;
+
+ if (restarting) {
+ /* write zero bytes -- don't touch encoder until we're at a frame-boundary
+ * otherwise the biphase polarity may be inverted.
+ */
+ enc_frames = fptcf / 10.0;
+ memset(<c_enc_buf[ltc_buf_len], 127, enc_frames * sizeof(ltcsnd_sample_t));
+ } else {
+ if (ltc_encoder_encode_byte(ltc_encoder, ltc_enc_byte, (ltc_speed==0)?1.0:(1.0/ltc_speed))) {
+ DEBUG_TRACE (DEBUG::LTC, string_compose("LTC TX6.3 encoder error byte %1\n", ltc_enc_byte));
+ ltc_encoder_buffer_flush(ltc_encoder);
+ ltc_tx_reset();
+ return;
+ }
+ enc_frames = ltc_encoder_get_buffer(ltc_encoder, &(ltc_enc_buf[ltc_buf_len]));
}
- int enc_frames = ltc_encoder_get_buffer(ltc_encoder, &(ltc_enc_buf[ltc_buf_len]));
+
#ifdef LTC_GEN_FRAMEDBUG
DEBUG_TRACE (DEBUG::LTC, string_compose("LTC TX6.3 encoded %1 bytes for LTC-byte %2 at spd %3\n", enc_frames, ltc_enc_byte, ltc_speed));
#endif
ltc_enc_cnt = 0;
} else if (ltc_enc_byte == 0) {
ltc_enc_cnt = 0;
+ restarting=false;
}
}
#ifdef LTC_GEN_FRAMEDBUG
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