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authorPaul Davis <paul@linuxaudiosystems.com>2008-06-02 21:41:35 +0000
committerPaul Davis <paul@linuxaudiosystems.com>2008-06-02 21:41:35 +0000
commit449aab3c465bbbf66d221fac3d7ea559f1720357 (patch)
tree6843cc40c88250a132acac701271f1504cd2df04 /libs/ardour/session_time.cc
parent9c0d7d72d70082a54f823cd44c0ccda5da64bb6f (diff)
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
Diffstat (limited to 'libs/ardour/session_time.cc')
-rw-r--r--libs/ardour/session_time.cc606
1 files changed, 606 insertions, 0 deletions
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 <iostream>
+#include <cmath>
+#include <unistd.h>
+
+#include <ardour/timestamps.h>
+
+#include <pbd/error.h>
+#include <pbd/enumwriter.h>
+#include <pbd/stacktrace.h>
+
+#include <ardour/ardour.h>
+#include <ardour/configuration.h>
+#include <ardour/audioengine.h>
+#include <ardour/session.h>
+#include <ardour/tempo.h>
+
+#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 <per@sigmond.no>
+
+ // 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;
+}