libs/ardour/session_time.cc

   1
   2 /*
   3   Copyright (C) 1999-2002 Paul Davis
   4
   5   This program is free software; you can redistribute it and/or modify
   6   it under the terms of the GNU General Public License as published by
   7   the Free Software Foundation; either version 2 of the License, or
   8   (at your option) any later version.
   9
  10   This program is distributed in the hope that it will be useful,
  11   but WITHOUT ANY WARRANTY; without even the implied warranty of
  12   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13   GNU General Public License for more details.
  14
  15   You should have received a copy of the GNU General Public License
  16   along with this program; if not, write to the Free Software
  17   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18
  19 */
  20
  21 #ifdef WAF_BUILD
  22 #include "libardour-config.h"
  23 #endif
  24
  25 #include <iostream>
  26 #include <cmath>
  27 #include <unistd.h>
  28
  29 #include "ardour/timestamps.h"
  30
  31 #include "pbd/error.h"
  32 #include "pbd/enumwriter.h"
  33 #include "pbd/stacktrace.h"
  34
  35 #include "ardour/session.h"
  36 #include "ardour/tempo.h"
  37
  38 #include "pbd/i18n.h"
  39
  40 using namespace std;
  41 using namespace ARDOUR;
  42 using namespace PBD;
  43
  44 /* BBT TIME*/
  45
  46 void
  47 Session::bbt_time (framepos_t when, Timecode::BBT_Time& bbt)
  48 {
  49         bbt = _tempo_map->bbt_at_frame (when);
  50 }
  51
  52 /* Timecode TIME */
  53
  54 double
  55 Session::timecode_frames_per_second() const
  56 {
  57         return Timecode::timecode_to_frames_per_second (config.get_timecode_format());
  58 }
  59
  60 bool
  61 Session::timecode_drop_frames() const
  62 {
  63         return Timecode::timecode_has_drop_frames(config.get_timecode_format());
  64 }
  65
  66 void
  67 Session::sync_time_vars ()
  68 {
  69         _current_frame_rate = (framecnt_t) round (_nominal_frame_rate * (1.0 + (config.get_video_pullup()/100.0)));
  70         _frames_per_timecode_frame = (double) _current_frame_rate / (double) timecode_frames_per_second();
  71         if (timecode_drop_frames()) {
  72           _frames_per_hour = (int32_t)(107892 * _frames_per_timecode_frame);
  73         } else {
  74           _frames_per_hour = (int32_t)(3600 * rint(timecode_frames_per_second()) * _frames_per_timecode_frame);
  75         }
  76         _timecode_frames_per_hour = rint(timecode_frames_per_second() * 3600.0);
  77
  78         last_timecode_valid = false;
  79         // timecode type bits are the middle two in the upper nibble
  80         switch ((int) ceil (timecode_frames_per_second())) {
  81         case 24:
  82                 mtc_timecode_bits = 0;
  83                 break;
  84
  85         case 25:
  86                 mtc_timecode_bits = 0x20;
  87                 break;
  88
  89         case 30:
  90         default:
  91                 if (timecode_drop_frames()) {
  92                         mtc_timecode_bits = 0x40;
  93                 } else {
  94                         mtc_timecode_bits =  0x60;
  95                 }
  96                 break;
  97         };
  98         ltc_tx_parse_offset();
  99 }
 100
 101 void
 102 Session::timecode_to_sample( Timecode::Time& timecode, framepos_t& sample, bool use_offset, bool use_subframes ) const
 103 {
 104         timecode.rate = timecode_frames_per_second();
 105
 106         Timecode::timecode_to_sample(
 107                 timecode, sample, use_offset, use_subframes,
 108                 _current_frame_rate,
 109                 config.get_subframes_per_frame(),
 110                 config.get_timecode_offset_negative(), config.get_timecode_offset()
 111                 );
 112
 113 }
 114
 115 void
 116 Session::sample_to_timecode (framepos_t sample, Timecode::Time& timecode, bool use_offset, bool use_subframes ) const
 117 {
 118         Timecode::sample_to_timecode (
 119                 sample, timecode, use_offset, use_subframes,
 120
 121                 timecode_frames_per_second(),
 122                 timecode_drop_frames(),
 123                 double(_current_frame_rate),
 124
 125                 config.get_subframes_per_frame(),
 126                 config.get_timecode_offset_negative(), config.get_timecode_offset()
 127                 );
 128 }
 129
 130 void
 131 Session::timecode_time (framepos_t when, Timecode::Time& timecode)
 132 {
 133         if (last_timecode_valid && when == last_timecode_when) {
 134                 timecode = last_timecode;
 135                 return;
 136         }
 137
 138         this->sample_to_timecode( when, timecode, true /* use_offset */, false /* use_subframes */ );
 139
 140         last_timecode_when = when;
 141         last_timecode = timecode;
 142         last_timecode_valid = true;
 143 }
 144
 145 void
 146 Session::timecode_time_subframes (framepos_t when, Timecode::Time& timecode)
 147 {
 148         if (last_timecode_valid && when == last_timecode_when) {
 149                 timecode = last_timecode;
 150                 return;
 151         }
 152
 153         this->sample_to_timecode( when, timecode, true /* use_offset */, true /* use_subframes */ );
 154
 155         last_timecode_when = when;
 156         last_timecode = timecode;
 157         last_timecode_valid = true;
 158 }
 159
 160 void
 161 Session::timecode_duration (framecnt_t when, Timecode::Time& timecode) const
 162 {
 163         this->sample_to_timecode( when, timecode, false /* use_offset */, true /* use_subframes */ );
 164 }
 165
 166 void
 167 Session::timecode_duration_string (char* buf, size_t len, framepos_t when) const
 168 {
 169         Timecode::Time timecode;
 170
 171         timecode_duration (when, timecode);
 172         snprintf (buf, len, "%02" PRIu32 ":%02" PRIu32 ":%02" PRIu32 ":%02" PRIu32, timecode.hours, timecode.minutes, timecode.seconds, timecode.frames);
 173 }
 174
 175 void
 176 Session::timecode_time (Timecode::Time &t)
 177
 178 {
 179         timecode_time (_transport_frame, t);
 180 }
 181
 182 int
 183 Session::backend_sync_callback (TransportState state, framepos_t pos)
 184 {
 185         bool slave = synced_to_engine();
 186
 187         switch (state) {
 188         case TransportStopped:
 189                 if (slave && _transport_frame != pos && post_transport_work() == 0) {
 190                         request_locate (pos, false);
 191                         // cerr << "SYNC: stopped, locate to " << pos->frame << " from " << _transport_frame << endl;
 192                         return false;
 193                 } else {
 194                         return true;
 195                 }
 196
 197         case TransportStarting:
 198                 // cerr << "SYNC: starting @ " << pos->frame << " a@ " << _transport_frame << " our work = " <<  post_transport_work() << " pos matches ? " << (_transport_frame == pos->frame) << endl;
 199                 if (slave) {
 200                         return _transport_frame == pos && post_transport_work() == 0;
 201                 } else {
 202                         return true;
 203                 }
 204                 break;
 205
 206         case TransportRolling:
 207                 // cerr << "SYNC: rolling slave = " << slave << endl;
 208                 if (slave) {
 209                         start_transport ();
 210                 }
 211                 break;
 212
 213         default:
 214                 error << string_compose (_("Unknown transport state %1 in sync callback"), state)
 215                       << endmsg;
 216         }
 217
 218         return true;
 219 }
 220
 221
 222 ARDOUR::framecnt_t
 223 Session::convert_to_frames (AnyTime const & position)
 224 {
 225         double secs;
 226
 227         switch (position.type) {
 228         case AnyTime::BBT:
 229                 return _tempo_map->frame_at_bbt (position.bbt);
 230                 break;
 231
 232         case AnyTime::Timecode:
 233                 /* XXX need to handle negative values */
 234                 secs = position.timecode.hours * 60 * 60;
 235                 secs += position.timecode.minutes * 60;
 236                 secs += position.timecode.seconds;
 237                 secs += position.timecode.frames / timecode_frames_per_second();
 238                 if (config.get_timecode_offset_negative()) {
 239                         return (framecnt_t) floor (secs * frame_rate()) - config.get_timecode_offset();
 240                 } else {
 241                         return (framecnt_t) floor (secs * frame_rate()) + config.get_timecode_offset();
 242                 }
 243                 break;
 244
 245         case AnyTime::Seconds:
 246                 return (framecnt_t) floor (position.seconds * frame_rate());
 247                 break;
 248
 249         case AnyTime::Frames:
 250                 return position.frames;
 251                 break;
 252         }
 253
 254         return position.frames;
 255 }
 256
 257 ARDOUR::framecnt_t
 258 Session::any_duration_to_frames (framepos_t position, AnyTime const & duration)
 259 {
 260         double secs;
 261
 262         switch (duration.type) {
 263         case AnyTime::BBT:
 264                 return (framecnt_t) ( _tempo_map->framepos_plus_bbt (position, duration.bbt) - position);
 265                 break;
 266
 267         case AnyTime::Timecode:
 268                 /* XXX need to handle negative values */
 269                 secs = duration.timecode.hours * 60 * 60;
 270                 secs += duration.timecode.minutes * 60;
 271                 secs += duration.timecode.seconds;
 272                 secs += duration.timecode.frames / timecode_frames_per_second();
 273                 if (config.get_timecode_offset_negative()) {
 274                         return (framecnt_t) floor (secs * frame_rate()) - config.get_timecode_offset();
 275                 } else {
 276                         return (framecnt_t) floor (secs * frame_rate()) + config.get_timecode_offset();
 277                 }
 278                 break;
 279
 280         case AnyTime::Seconds:
 281                 return (framecnt_t) floor (duration.seconds * frame_rate());
 282                 break;
 283
 284         case AnyTime::Frames:
 285                 return duration.frames;
 286                 break;
 287         }
 288
 289         return duration.frames;
 290 }