ardour/livetrax
13
0
Fork 0
Code
7bd41538d9
livetrax/libs/ardour/session_time.cc
David Robillard 7bd41538d9 Merged with trunk R920. 
git-svn-id: svn://localhost/ardour2/branches/midi@921 d708f5d6-7413-0410-9779-e7cbd77b26cf
2006-09-19 03:29:16 +00:00

518 lines
15 KiB
C++
Raw Blame History

/*
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.
$Id$
*/
#include <iostream>
#include <cmath>
#include <unistd.h>
#include <ardour/timestamps.h>
#include <pbd/error.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 (jack_nframes_t when, BBT_Time& bbt)
{
_tempo_map->bbt_time (when, bbt);
}
/* SMPTE TIME */
void
Session::sync_time_vars ()
{
_current_frame_rate = (jack_nframes_t) round (_base_frame_rate * (1.0 + (video_pullup/100.0)));
_frames_per_hour = _current_frame_rate * 3600;
_frames_per_smpte_frame = (double) _current_frame_rate / (double) smpte_frames_per_second;
_smpte_frames_per_hour = (unsigned long) (smpte_frames_per_second * 3600.0);
}
int
Session::set_smpte_type (float fps, bool drop_frames)
{
smpte_frames_per_second = fps;
smpte_drop_frames = drop_frames;
last_smpte_valid = false;
// smpte type bits are the middle two in the upper nibble
switch ((int) ceil (fps)) {
case 24:
mtc_smpte_bits = 0;
SMPTE::Time::default_rate = SMPTE::MTC_24_FPS;
break;
case 25:
mtc_smpte_bits = 0x20;
SMPTE::Time::default_rate = SMPTE::MTC_25_FPS;
break;
case 30:
default:
if (drop_frames) {
mtc_smpte_bits = 0x40;
SMPTE::Time::default_rate = SMPTE::MTC_30_FPS_DROP;
} else {
mtc_smpte_bits = 0x60;
SMPTE::Time::default_rate = SMPTE::MTC_30_FPS;
}
break;
};
sync_time_vars();
SMPTETypeChanged (); /* EMIT SIGNAL */
set_dirty();
return 0;
}
int
Session::set_video_pullup (float pull)
{
video_pullup = pull;
sync_time_vars();
PullupChanged (); /* EMIT SIGNAL */
set_dirty();
return 0;
}
void
Session::set_smpte_offset (jack_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, jack_nframes_t& sample, bool use_offset, bool use_subframes ) const
{
if (smpte_drop_frames) {
// 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)
jack_nframes_t base_samples = ((smpte.hours * 60 * 60) + ((smpte.minutes / 10) * 10 * 60)) * frame_rate();
// 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);
jack_nframes_t exceeding_samples = (jack_nframes_t) rint(exceeding_df_frames * _frames_per_smpte_frame);
sample = base_samples + exceeding_samples;
} else {
// Non drop is easy:
sample = (((smpte.hours * 60 * 60) + (smpte.minutes * 60) + smpte.seconds) * frame_rate()) + (jack_nframes_t)rint(smpte.frames * _frames_per_smpte_frame);
}
if (use_subframes) {
sample += (long) (((double)smpte.subframes * _frames_per_smpte_frame) / 80.0);
}
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( jack_nframes_t sample, SMPTE::Time& smpte, bool use_offset, bool use_subframes ) const
{
jack_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 * 80.0);
// XXX Not sure if this is necessary anymore...
if (smpte.subframes == 80) {
// 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) smpte_frames_per_second * 60);
smpte_frames_left = smpte_frames_left % ((long) smpte_frames_per_second * 60);
smpte.seconds = smpte_frames_left / (long) smpte_frames_per_second;
smpte.frames = smpte_frames_left % (long) smpte_frames_per_second;
}
if (!use_subframes) {
smpte.subframes = 0;
}
}
void
Session::smpte_time (jack_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 (jack_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 (jack_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, jack_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,
jack_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 (auto_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
}
jack_nframes_t
Session::convert_to_frames_at (jack_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 (jack_nframes_t) floor (secs * frame_rate()) - _smpte_offset;
}
else
{
return (jack_nframes_t) floor (secs * frame_rate()) + _smpte_offset;
}
break;
case AnyTime::Seconds:
return (jack_nframes_t) floor (any.seconds * frame_rate());
break;
case AnyTime::Frames:
return any.frames;
break;
}
return any.frames;
}
View Git Blame Copy Permalink