From 449aab3c465bbbf66d221fac3d7ea559f1720357 Mon Sep 17 00:00:00 2001 From: Paul Davis Date: Mon, 2 Jun 2008 21:41:35 +0000 Subject: rollback to 3428, before the mysterious removal of libs/* at 3431/3432 git-svn-id: svn://localhost/ardour2/branches/3.0@3435 d708f5d6-7413-0410-9779-e7cbd77b26cf --- libs/ardour/session_time.cc | 606 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 606 insertions(+) create mode 100644 libs/ardour/session_time.cc (limited to 'libs/ardour/session_time.cc') diff --git a/libs/ardour/session_time.cc b/libs/ardour/session_time.cc new file mode 100644 index 0000000000..a388e31d80 --- /dev/null +++ b/libs/ardour/session_time.cc @@ -0,0 +1,606 @@ + +/* + Copyright (C) 1999-2002 Paul Davis + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, 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 General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + +*/ + +#include +#include +#include + +#include + +#include +#include +#include + +#include +#include +#include +#include +#include + +#include "i18n.h" + +using namespace ARDOUR; +using namespace PBD; + +/* BBT TIME*/ + +void +Session::bbt_time (nframes_t when, BBT_Time& bbt) +{ + _tempo_map->bbt_time (when, bbt); +} + +/* SMPTE TIME */ +float +Session::smpte_frames_per_second() const +{ + switch (Config->get_smpte_format()) { + case smpte_23976: + return 23.976; + + break; + case smpte_24: + return 24; + + break; + case smpte_24976: + return 24.976; + + break; + case smpte_25: + return 25; + + break; + case smpte_2997: + return 29.97; + + break; + case smpte_2997drop: + return 29.97; + + break; + case smpte_30: + return 30; + + break; + case smpte_30drop: + return 30; + + break; + case smpte_5994: + return 59.94; + + break; + case smpte_60: + return 60; + + break; + default: + cerr << "Editor received unexpected smpte type" << endl; + } + return 30.0; +} +bool +Session::smpte_drop_frames() const +{ + switch (Config->get_smpte_format()) { + case smpte_23976: + return false; + + break; + case smpte_24: + return false; + + break; + case smpte_24976: + return false; + + break; + case smpte_25: + return false; + + break; + case smpte_2997: + return false; + + break; + case smpte_2997drop: + return true; + + break; + case smpte_30: + return false; + + break; + case smpte_30drop: + return true; + + break; + case smpte_5994: + return false; + + break; + case smpte_60: + return false; + + break; + default: + cerr << "Editor received unexpected smpte type" << endl; + } + return false; +} +void +Session::sync_time_vars () +{ + _current_frame_rate = (nframes_t) round (_base_frame_rate * (1.0 + (Config->get_video_pullup()/100.0))); + _frames_per_smpte_frame = (double) _current_frame_rate / (double) smpte_frames_per_second(); + if (smpte_drop_frames()) { + _frames_per_hour = (long)(107892 * _frames_per_smpte_frame); + } else { + _frames_per_hour = (long)(3600 * rint(smpte_frames_per_second()) * _frames_per_smpte_frame); + } + _smpte_frames_per_hour = (nframes_t)rint(smpte_frames_per_second() * 3600.0); + + last_smpte_valid = false; + // smpte type bits are the middle two in the upper nibble + switch ((int) ceil (smpte_frames_per_second())) { + case 24: + mtc_smpte_bits = 0; + break; + + case 25: + mtc_smpte_bits = 0x20; + break; + + case 30: + default: + if (smpte_drop_frames()) { + mtc_smpte_bits = 0x40; + } else { + mtc_smpte_bits = 0x60; + } + break; + }; +} + +int +Session::set_smpte_format (SmpteFormat format) +{ + /* this will trigger any other changes needed */ + Config->set_smpte_format (format); + return 0; +} + +void +Session::set_smpte_offset (nframes_t off) +{ + _smpte_offset = off; + last_smpte_valid = false; + + SMPTEOffsetChanged (); /* EMIT SIGNAL */ +} + +void +Session::set_smpte_offset_negative (bool neg) +{ + _smpte_offset_negative = neg; + last_smpte_valid = false; + + SMPTEOffsetChanged (); /* EMIT SIGNAL */ +} + +void +Session::smpte_to_sample( SMPTE::Time& smpte, nframes_t& sample, bool use_offset, bool use_subframes ) const +{ + + if (smpte.drop) { + // The drop frame format was created to better approximate the 30000/1001 = 29.97002997002997.... + // framerate of NTSC color TV. The used frame rate of drop frame is 29.97, which drifts by about + // 0.108 frame per hour, or about 1.3 frames per 12 hours. This is not perfect, but a lot better + // than using 30 non drop, which will drift with about 1.8 frame per minute. + // Using 29.97, drop frame real time can be accurate only every 10th minute (10 minutes of 29.97 fps + // is exactly 17982 frames). One minute is 1798.2 frames, but we count 30 frames per second + // (30 * 60 = 1800). This means that at the first minute boundary (at the end of 0:0:59:29) we + // are 1.8 frames too late relative to real time. By dropping 2 frames (jumping to 0:1:0:2) we are + // approx. 0.2 frames too early. This adds up with 0.2 too early for each minute until we are 1.8 + // frames too early at 0:9:0:2 (9 * 0.2 = 1.8). The 10th minute brings us 1.8 frames later again + // (at end of 0:9:59:29), which sums up to 0 (we are back to zero at 0:10:0:0 :-). + // + // In table form: + // + // SMPTE value frames offset subframes offset seconds (rounded) 44100 sample (rounded) + // 0:00:00:00 0.0 0 0.000 0 (accurate) + // 0:00:59:29 1.8 144 60.027 2647177 + // 0:01:00:02 -0.2 -16 60.060 2648648 + // 0:01:59:29 1.6 128 120.020 5292883 + // 0:02:00:02 -0.4 -32 120.053 5294354 + // 0:02:59:29 1.4 112 180.013 7938588 + // 0:03:00:02 -0.6 -48 180.047 7940060 + // 0:03:59:29 1.2 96 240.007 10584294 + // 0:04:00:02 -0.8 -64 240.040 10585766 + // 0:04:59:29 1.0 80 300.000 13230000 + // 0:05:00:02 -1.0 -80 300.033 13231471 + // 0:05:59:29 0.8 64 359.993 15875706 + // 0:06:00:02 -1.2 -96 360.027 15877177 + // 0:06:59:29 0.6 48 419.987 18521411 + // 0:07:00:02 -1.4 -112 420.020 18522883 + // 0:07:59:29 0.4 32 478.980 21167117 + // 0:08:00:02 -1.6 -128 480.013 21168589 + // 0:08:59:29 0.2 16 539.973 23812823 + // 0:09:00:02 -1.8 -144 540.007 23814294 + // 0:09:59:29 0.0+ 0+ 599.967 26458529 + // 0:10:00:00 0.0 0 600.000 26460000 (accurate) + // + // Per Sigmond + + // Samples inside time dividable by 10 minutes (real time accurate) + nframes_t base_samples = (nframes_t) (((smpte.hours * 107892) + ((smpte.minutes / 10) * 17982)) * _frames_per_smpte_frame); + + // Samples inside time exceeding the nearest 10 minutes (always offset, see above) + long exceeding_df_minutes = smpte.minutes % 10; + long exceeding_df_seconds = (exceeding_df_minutes * 60) + smpte.seconds; + long exceeding_df_frames = (30 * exceeding_df_seconds) + smpte.frames - (2 * exceeding_df_minutes); + nframes_t exceeding_samples = (nframes_t) rint(exceeding_df_frames * _frames_per_smpte_frame); + sample = base_samples + exceeding_samples; + } else { + /* + Non drop is easy.. just note the use of + rint(smpte.rate) * _frames_per_smpte_frame + (frames per SMPTE second), which is larger than + frame_rate() in the non-integer SMPTE rate case. + */ + + sample = (nframes_t)rint((((smpte.hours * 60 * 60) + (smpte.minutes * 60) + smpte.seconds) * (rint(smpte.rate) * _frames_per_smpte_frame)) + (smpte.frames * _frames_per_smpte_frame)); + } + + if (use_subframes) { + sample += (long) (((double)smpte.subframes * _frames_per_smpte_frame) / Config->get_subframes_per_frame()); + } + + if (use_offset) { + if (smpte_offset_negative()) { + if (sample >= smpte_offset()) { + sample -= smpte_offset(); + } else { + /* Prevent song-time from becoming negative */ + sample = 0; + } + } else { + if (smpte.negative) { + if (sample <= smpte_offset()) { + sample = smpte_offset() - sample; + } else { + sample = 0; + } + } else { + sample += smpte_offset(); + } + } + } + +} + + +void +Session::sample_to_smpte( nframes_t sample, SMPTE::Time& smpte, bool use_offset, bool use_subframes ) const +{ + nframes_t offset_sample; + + if (!use_offset) { + offset_sample = sample; + smpte.negative = false; + } else { + if (_smpte_offset_negative) { + offset_sample = sample + _smpte_offset; + smpte.negative = false; + } else { + if (sample < _smpte_offset) { + offset_sample = (_smpte_offset - sample); + smpte.negative = true; + } else { + offset_sample = sample - _smpte_offset; + smpte.negative = false; + } + } + } + + double smpte_frames_left_exact; + double smpte_frames_fraction; + unsigned long smpte_frames_left; + + // Extract whole hours. Do this to prevent rounding errors with + // high sample numbers in the calculations that follow. + smpte.hours = offset_sample / _frames_per_hour; + offset_sample = offset_sample % _frames_per_hour; + + // Calculate exact number of (exceeding) smpte frames and fractional frames + smpte_frames_left_exact = (double) offset_sample / _frames_per_smpte_frame; + smpte_frames_fraction = smpte_frames_left_exact - floor( smpte_frames_left_exact ); + smpte.subframes = (long) rint(smpte_frames_fraction * Config->get_subframes_per_frame()); + + // XXX Not sure if this is necessary anymore... + if (smpte.subframes == Config->get_subframes_per_frame()) { + // This can happen with 24 fps (and 29.97 fps ?) + smpte_frames_left_exact = ceil( smpte_frames_left_exact ); + smpte.subframes = 0; + } + + // Extract hour-exceeding frames for minute, second and frame calculations + smpte_frames_left = ((long) floor( smpte_frames_left_exact )); + + if (smpte_drop_frames()) { + // See long explanation in smpte_to_sample()... + + // Number of 10 minute chunks + smpte.minutes = (smpte_frames_left / 17982) * 10; // exactly 17982 frames in 10 minutes + // frames exceeding the nearest 10 minute barrier + long exceeding_df_frames = smpte_frames_left % 17982; + + // Find minutes exceeding the nearest 10 minute barrier + if (exceeding_df_frames >= 1800) { // nothing to do if we are inside the first minute (0-1799) + exceeding_df_frames -= 1800; // take away first minute (different number of frames than the others) + long extra_minutes_minus_1 = exceeding_df_frames / 1798; // how many minutes after the first one + exceeding_df_frames -= extra_minutes_minus_1 * 1798; // take away the (extra) minutes just found + smpte.minutes += extra_minutes_minus_1 + 1; // update with exceeding minutes + } + + // Adjust frame numbering for dropped frames (frame 0 and 1 skipped at start of every minute except every 10th) + if (smpte.minutes % 10) { + // Every minute except every 10th + if (exceeding_df_frames < 28) { + // First second, frames 0 and 1 are skipped + smpte.seconds = 0; + smpte.frames = exceeding_df_frames + 2; + } else { + // All other seconds, all 30 frames are counted + exceeding_df_frames -= 28; + smpte.seconds = (exceeding_df_frames / 30) + 1; + smpte.frames = exceeding_df_frames % 30; + } + } else { + // Every 10th minute, all 30 frames counted in all seconds + smpte.seconds = exceeding_df_frames / 30; + smpte.frames = exceeding_df_frames % 30; + } + } else { + // Non drop is easy + smpte.minutes = smpte_frames_left / ((long) rint (smpte_frames_per_second ()) * 60); + smpte_frames_left = smpte_frames_left % ((long) rint (smpte_frames_per_second ()) * 60); + smpte.seconds = smpte_frames_left / (long) rint(smpte_frames_per_second ()); + smpte.frames = smpte_frames_left % (long) rint(smpte_frames_per_second ()); + } + + if (!use_subframes) { + smpte.subframes = 0; + } + /* set frame rate and drop frame */ + smpte.rate = smpte_frames_per_second (); + smpte.drop = smpte_drop_frames(); +} + +void +Session::smpte_time (nframes_t when, SMPTE::Time& smpte) +{ + if (last_smpte_valid && when == last_smpte_when) { + smpte = last_smpte; + return; + } + + sample_to_smpte( when, smpte, true /* use_offset */, false /* use_subframes */ ); + + last_smpte_when = when; + last_smpte = smpte; + last_smpte_valid = true; +} + +void +Session::smpte_time_subframes (nframes_t when, SMPTE::Time& smpte) +{ + if (last_smpte_valid && when == last_smpte_when) { + smpte = last_smpte; + return; + } + + sample_to_smpte( when, smpte, true /* use_offset */, true /* use_subframes */ ); + + last_smpte_when = when; + last_smpte = smpte; + last_smpte_valid = true; +} + +void +Session::smpte_duration (nframes_t when, SMPTE::Time& smpte) const +{ + sample_to_smpte( when, smpte, false /* use_offset */, true /* use_subframes */ ); +} + +void +Session::smpte_duration_string (char* buf, nframes_t when) const +{ + SMPTE::Time smpte; + + smpte_duration (when, smpte); + snprintf (buf, sizeof (buf), "%02" PRIu32 ":%02" PRIu32 ":%02" PRIu32 ":%02" PRIu32, smpte.hours, smpte.minutes, smpte.seconds, smpte.frames); +} + +void +Session::smpte_time (SMPTE::Time &t) + +{ + smpte_time (_transport_frame, t); +} + +int +Session::jack_sync_callback (jack_transport_state_t state, + jack_position_t* pos) +{ + bool slave = synced_to_jack(); + + switch (state) { + case JackTransportStopped: + if (slave && _transport_frame != pos->frame && post_transport_work == 0) { + request_locate (pos->frame, false); + // cerr << "SYNC: stopped, locate to " << pos->frame << " from " << _transport_frame << endl; + return false; + } else { + return true; + } + + case JackTransportStarting: + // cerr << "SYNC: starting @ " << pos->frame << " a@ " << _transport_frame << " our work = " << post_transport_work << " pos matches ? " << (_transport_frame == pos->frame) << endl; + if (slave) { + return _transport_frame == pos->frame && post_transport_work == 0; + } else { + return true; + } + break; + + case JackTransportRolling: + // cerr << "SYNC: rolling slave = " << slave << endl; + if (slave) { + start_transport (); + } + break; + + default: + error << string_compose (_("Unknown JACK transport state %1 in sync callback"), state) + << endmsg; + } + + return true; +} + +void +Session::jack_timebase_callback (jack_transport_state_t state, + nframes_t nframes, + jack_position_t* pos, + int new_position) +{ + BBT_Time bbt; + + /* frame info */ + + pos->frame = _transport_frame; + pos->valid = JackPositionTimecode; + + /* BBT info */ + + if (_tempo_map) { + + TempoMap::Metric metric (_tempo_map->metric_at (_transport_frame)); + _tempo_map->bbt_time_with_metric (_transport_frame, bbt, metric); + + pos->bar = bbt.bars; + pos->beat = bbt.beats; + pos->tick = bbt.ticks; + + // XXX still need to set bar_start_tick + + pos->beats_per_bar = metric.meter().beats_per_bar(); + pos->beat_type = metric.meter().note_divisor(); + pos->ticks_per_beat = Meter::ticks_per_beat; + pos->beats_per_minute = metric.tempo().beats_per_minute(); + + pos->valid = jack_position_bits_t (pos->valid | JackPositionBBT); + } + +#ifdef HAVE_JACK_VIDEO_SUPPORT + //poke audio video ratio so Ardour can track Video Sync + pos->audio_frames_per_video_frame = frame_rate() / smpte_frames_per_second(); + pos->valid = jack_position_bits_t (pos->valid | JackAudioVideoRatio); +#endif + +#if 0 + /* SMPTE info */ + + t.smpte_offset = _smpte_offset; + t.smpte_frame_rate = smpte_frames_per_second(); + + if (_transport_speed) { + + if (play_loop) { + + Location* location = _locations.auto_loop_location(); + + if (location) { + + t.transport_state = JackTransportLooping; + t.loop_start = location->start(); + t.loop_end = location->end(); + t.valid = jack_transport_bits_t (t.valid | JackTransportLoop); + + } else { + + t.loop_start = 0; + t.loop_end = 0; + t.transport_state = JackTransportRolling; + + } + + } else { + + t.loop_start = 0; + t.loop_end = 0; + t.transport_state = JackTransportRolling; + + } + + } + +#endif +} + +ARDOUR::nframes_t +Session::convert_to_frames_at (nframes_t position, AnyTime& any) +{ + double secs; + + switch (any.type) { + case AnyTime::BBT: + return _tempo_map->frame_time ( any.bbt); + break; + + case AnyTime::SMPTE: + /* XXX need to handle negative values */ + secs = any.smpte.hours * 60 * 60; + secs += any.smpte.minutes * 60; + secs += any.smpte.seconds; + secs += any.smpte.frames / smpte_frames_per_second(); + if (_smpte_offset_negative) + { + return (nframes_t) floor (secs * frame_rate()) - _smpte_offset; + } + else + { + return (nframes_t) floor (secs * frame_rate()) + _smpte_offset; + } + break; + + case AnyTime::Seconds: + return (nframes_t) floor (any.seconds * frame_rate()); + break; + + case AnyTime::Frames: + return any.frames; + break; + } + + return any.frames; +} -- cgit v1.2.3