/* port latency compensation:
* The _generated timecode_ is offset by the port-latency,
* therefore the offset depends on the direction of transport.
+ *
+ * latency is compensated by adding it to the timecode to
+ * be generated. e.g. if the signal will reach the output in
+ * N samples time from now, generate the timecode for (now + N).
+ *
+ * sample-sync is achieved by further calculating the difference
+ * between the timecode and the session-transport and offsetting the
+ * buffer.
+ *
+ * The timecode is generated directly in the Session process callback
+ * using _transport_frame. It requires that the session has set the
+ * port's playback latency to worst_playback_latency() prior to
+ * calling ltc_tx_send_time_code_for_cycle().
*/
framepos_t cycle_start_frame;
if (current_speed < 0) {
- cycle_start_frame = (start_frame - ltc_out_latency.max);
+ cycle_start_frame = (start_frame - ltc_out_latency.max + worst_playback_latency());
} else if (current_speed > 0) {
- cycle_start_frame = (start_frame + ltc_out_latency.max);
+ cycle_start_frame = (start_frame + ltc_out_latency.max - worst_playback_latency());
} else {
/* There is no need to compensate for latency when not rolling
* rather send the accurate NOW timecode