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fix LTC frame TVstandard offset

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<pre>
       Ardour-
      transport
     01:00:00:01
          |
          |
    5   5 |           NTSC Line
    2   2 |                                     1
    4   5 v 1   2   3   4   5   6   7   8   9   0
  ____________________             ________________    TV
  |   |   | | | | | | |_|_|_|_|_|_| | | | | | |   |

                          ^
                          |
                          v

    +-+ +-+ + + +-+   +-+ +---+   +---+
  | | | | | | | | |   | | |   |   |   |   |            LTC
  +-+ +-+ +-+ +-+ +---+ +-+   +---+   +---+

           SYNC-WORD      |
              LTC       B | B       LTC
          01:00:00:00   I | I   01:00:00:01
                        T   T
                        7
                        9   0
</pre>

git-svn-id: svn://localhost/ardour2/branches/3.0@13524 d708f5d6-7413-0410-9779-e7cbd77b26cf
This commit is contained in:
Robin Gareus 2012-11-18 09:53:13 +00:00
parent 4269bccfeb
commit 89fa20bb75
2 changed files with 5 additions and 5 deletions
Download patch file Download diff file Expand all files Collapse all files

8
libs/ardour/ltc_slave.cc
View file

@ -359,13 +359,13 @@ LTC_Slave::process_ltc(framepos_t const now)
ltc_frame_increment(&frame.ltc, fps_i, tv_standard, 0);
ltc_frame_to_time(&stime, &frame.ltc, 0);
transport_direction = 1;
frame.off_start += ltc_frame_alignment(session.frames_per_timecode_frame(), tv_standard);
frame.off_end += ltc_frame_alignment(session.frames_per_timecode_frame(), tv_standard);
frame.off_start -= ltc_frame_alignment(session.frames_per_timecode_frame(), tv_standard);
frame.off_end -= ltc_frame_alignment(session.frames_per_timecode_frame(), tv_standard);
} else {
ltc_frame_decrement(&frame.ltc, fps_i, tv_standard, 0);
int off = frame.off_end - frame.off_start;
frame.off_start += off + ltc_frame_alignment(session.frames_per_timecode_frame(), tv_standard);
frame.off_end += off + ltc_frame_alignment(session.frames_per_timecode_frame(), tv_standard);
frame.off_start += off - ltc_frame_alignment(session.frames_per_timecode_frame(), tv_standard);
frame.off_end += off - ltc_frame_alignment(session.frames_per_timecode_frame(), tv_standard);
transport_direction = -1;
}

2
libs/ardour/session_ltc.cc
View file

@ -246,7 +246,7 @@ Session::ltc_tx_send_time_code_for_cycle (framepos_t start_frame, framepos_t end
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_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; }