From b3fe29af410d0e809d4c2e5e15e78a064fda63e4 Mon Sep 17 00:00:00 2001 From: Carl Hetherington Date: Mon, 3 Jan 2011 23:54:36 +0000 Subject: Cope with non-unity transport speed when sending MTC. git-svn-id: svn://localhost/ardour2/branches/3.0@8422 d708f5d6-7413-0410-9779-e7cbd77b26cf --- libs/ardour/session_midi.cc | 46 ++++++++++++++++++++++----------------------- 1 file changed, 22 insertions(+), 24 deletions(-) (limited to 'libs/ardour/session_midi.cc') diff --git a/libs/ardour/session_midi.cc b/libs/ardour/session_midi.cc index 43fedefc15..31e4e9ca47 100644 --- a/libs/ardour/session_midi.cc +++ b/libs/ardour/session_midi.cc @@ -411,7 +411,7 @@ Session::send_full_time_code (framepos_t const t) * earlier already this cycle by send_full_time_code) */ int -Session::send_midi_time_code_for_cycle (pframes_t nframes) +Session::send_midi_time_code_for_cycle (framepos_t start_frame, framepos_t end_frame, pframes_t nframes) { if (_slave || !session_send_mtc || transmitting_timecode_time.negative || (next_quarter_frame_to_send < 0)) { // cerr << "(MTC) Not sending MTC\n"; @@ -422,57 +422,55 @@ Session::send_midi_time_code_for_cycle (pframes_t nframes) assert (next_quarter_frame_to_send <= 7); /* Duration of one quarter frame */ - framecnt_t quarter_frame_duration = ((framecnt_t) _frames_per_timecode_frame) >> 2; + framecnt_t const quarter_frame_duration = ((framecnt_t) _frames_per_timecode_frame) >> 2; - DEBUG_TRACE (DEBUG::MTC, string_compose ("TF %1 SF %2 NQ %3 FD %4\n", _transport_frame, outbound_mtc_timecode_frame, + DEBUG_TRACE (DEBUG::MTC, string_compose ("TF %1 SF %2 NQ %3 FD %4\n", start_frame, outbound_mtc_timecode_frame, next_quarter_frame_to_send, quarter_frame_duration)); - assert((outbound_mtc_timecode_frame + (next_quarter_frame_to_send * quarter_frame_duration)) - >= _transport_frame); + assert ((outbound_mtc_timecode_frame + (next_quarter_frame_to_send * quarter_frame_duration)) >= _transport_frame); - - // Send quarter frames for this cycle - while (_transport_frame + nframes > (outbound_mtc_timecode_frame + - (next_quarter_frame_to_send * quarter_frame_duration))) { + /* Send quarter frames for this cycle */ + while (end_frame > (outbound_mtc_timecode_frame + (next_quarter_frame_to_send * quarter_frame_duration))) { DEBUG_TRACE (DEBUG::MTC, string_compose ("next frame to send: %1\n", next_quarter_frame_to_send)); switch (next_quarter_frame_to_send) { case 0: - mtc_msg[1] = 0x00 | (transmitting_timecode_time.frames & 0xf); + mtc_msg[1] = 0x00 | (transmitting_timecode_time.frames & 0xf); break; case 1: - mtc_msg[1] = 0x10 | ((transmitting_timecode_time.frames & 0xf0) >> 4); + mtc_msg[1] = 0x10 | ((transmitting_timecode_time.frames & 0xf0) >> 4); break; case 2: - mtc_msg[1] = 0x20 | (transmitting_timecode_time.seconds & 0xf); + mtc_msg[1] = 0x20 | (transmitting_timecode_time.seconds & 0xf); break; case 3: - mtc_msg[1] = 0x30 | ((transmitting_timecode_time.seconds & 0xf0) >> 4); + mtc_msg[1] = 0x30 | ((transmitting_timecode_time.seconds & 0xf0) >> 4); break; case 4: - mtc_msg[1] = 0x40 | (transmitting_timecode_time.minutes & 0xf); + mtc_msg[1] = 0x40 | (transmitting_timecode_time.minutes & 0xf); break; case 5: mtc_msg[1] = 0x50 | ((transmitting_timecode_time.minutes & 0xf0) >> 4); break; case 6: - mtc_msg[1] = 0x60 | ((mtc_timecode_bits|transmitting_timecode_time.hours) & 0xf); + mtc_msg[1] = 0x60 | ((mtc_timecode_bits | transmitting_timecode_time.hours) & 0xf); break; case 7: - mtc_msg[1] = 0x70 | (((mtc_timecode_bits|transmitting_timecode_time.hours) & 0xf0) >> 4); + mtc_msg[1] = 0x70 | (((mtc_timecode_bits | transmitting_timecode_time.hours) & 0xf0) >> 4); break; } - const framepos_t msg_time = (outbound_mtc_timecode_frame - + (quarter_frame_duration * next_quarter_frame_to_send)); + const framepos_t msg_time = outbound_mtc_timecode_frame + (quarter_frame_duration * next_quarter_frame_to_send); + cout << " " << msg_time << "\n"; // This message must fall within this block or something is broken - assert(msg_time >= _transport_frame); - assert(msg_time < _transport_frame + nframes); + assert (msg_time >= start_frame); + assert (msg_time < end_frame); - framepos_t out_stamp = msg_time - _transport_frame; - assert(out_stamp < nframes); + /* convert from session frames back to JACK frames using the transport speed */ + pframes_t const out_stamp = (msg_time - start_frame) / _transport_speed; + assert (out_stamp < nframes); if (MIDI::Manager::instance()->mtc_output_port()->midimsg (mtc_msg, 2, out_stamp)) { error << string_compose(_("Session: cannot send quarter-frame MTC message (%1)"), strerror (errno)) @@ -495,8 +493,8 @@ Session::send_midi_time_code_for_cycle (pframes_t nframes) // Wrap quarter frame counter next_quarter_frame_to_send = 0; // Increment timecode time twice - Timecode::increment( transmitting_timecode_time, config.get_subframes_per_frame() ); - Timecode::increment( transmitting_timecode_time, config.get_subframes_per_frame() ); + Timecode::increment (transmitting_timecode_time, config.get_subframes_per_frame()); + Timecode::increment (transmitting_timecode_time, config.get_subframes_per_frame()); // Re-calculate timing of first quarter frame //timecode_to_sample( transmitting_timecode_time, outbound_mtc_timecode_frame, true /* use_offset */, false ); outbound_mtc_timecode_frame += 8 * quarter_frame_duration; -- cgit v1.2.3