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livetrax/libs/surfaces/control_protocol/smpte.cc
David Robillard 532f6aad4a Merged with trunk R1283. 
NOTE: Compiles, but broken (crash on adding MIDI track).


git-svn-id: svn://localhost/ardour2/branches/midi@1292 d708f5d6-7413-0410-9779-e7cbd77b26cf
2007-01-09 23:24:54 +00:00

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/*
Copyright (C) 2006 Paul Davis
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser 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.
*/
#define SMPTE_IS_AROUND_ZERO( sm ) (!(sm).frames && !(sm).seconds && !(sm).minutes && !(sm).hours)
#define SMPTE_IS_ZERO( sm ) (!(sm).frames && !(sm).seconds && !(sm).minutes && !(sm).hours && !(sm.subframes))
#include <control_protocol/smpte.h>
#include <ardour/configuration.h>
namespace SMPTE {
float Time::default_rate = 30.0;
/** Increment @a smpte by exactly one frame (keep subframes value).
* Realtime safe.
* @return true if seconds wrap.
*/
Wrap
increment( Time& smpte )
{
Wrap wrap = NONE;
if (smpte.negative) {
if (SMPTE_IS_AROUND_ZERO(smpte) && smpte.subframes) {
// We have a zero transition involving only subframes
smpte.subframes = ARDOUR::Config->get_subframes_per_frame() - smpte.subframes;
smpte.negative = false;
return SECONDS;
}
smpte.negative = false;
wrap = decrement( smpte );
if (!SMPTE_IS_ZERO( smpte )) {
smpte.negative = true;
}
return wrap;
}
switch ((int)ceil(smpte.rate)) {
case 24:
if (smpte.frames == 23) {
smpte.frames = 0;
wrap = SECONDS;
}
break;
case 25:
if (smpte.frames == 24) {
smpte.frames = 0;
wrap = SECONDS;
}
break;
case 30:
if (smpte.drop) {
if (smpte.frames == 29) {
if ( ((smpte.minutes + 1) % 10) && (smpte.seconds == 59) ) {
smpte.frames = 2;
}
else {
smpte.frames = 0;
}
wrap = SECONDS;
}
} else {
if (smpte.frames == 29) {
smpte.frames = 0;
wrap = SECONDS;
}
}
break;
case 60:
if (smpte.frames == 59) {
smpte.frames = 0;
wrap = SECONDS;
}
break;
}
if (wrap == SECONDS) {
if (smpte.seconds == 59) {
smpte.seconds = 0;
wrap = MINUTES;
if (smpte.minutes == 59) {
smpte.minutes = 0;
wrap = HOURS;
smpte.hours++;
} else {
smpte.minutes++;
}
} else {
smpte.seconds++;
}
} else {
smpte.frames++;
}
return wrap;
}
/** Decrement @a smpte by exactly one frame (keep subframes value)
* Realtime safe.
* @return true if seconds wrap. */
Wrap
decrement( Time& smpte )
{
Wrap wrap = NONE;
if (smpte.negative || SMPTE_IS_ZERO(smpte)) {
smpte.negative = false;
wrap = increment( smpte );
smpte.negative = true;
return wrap;
} else if (SMPTE_IS_AROUND_ZERO(smpte) && smpte.subframes) {
// We have a zero transition involving only subframes
smpte.subframes = ARDOUR::Config->get_subframes_per_frame() - smpte.subframes;
smpte.negative = true;
return SECONDS;
}
switch ((int)ceil(smpte.rate)) {
case 24:
if (smpte.frames == 0) {
smpte.frames = 23;
wrap = SECONDS;
}
break;
case 25:
if (smpte.frames == 0) {
smpte.frames = 24;
wrap = SECONDS;
}
break;
case 30:
if (smpte.drop) {
if ((smpte.minutes % 10) && (smpte.seconds == 0)) {
if (smpte.frames <= 2) {
smpte.frames = 29;
wrap = SECONDS;
}
} else if (smpte.frames == 0) {
smpte.frames = 29;
wrap = SECONDS;
}
} else {
if (smpte.frames == 0) {
smpte.frames = 29;
wrap = SECONDS;
}
}
break;
case 60:
if (smpte.frames == 0) {
smpte.frames = 59;
wrap = SECONDS;
}
break;
}
if (wrap == SECONDS) {
if (smpte.seconds == 0) {
smpte.seconds = 59;
wrap = MINUTES;
if (smpte.minutes == 0) {
smpte.minutes = 59;
wrap = HOURS;
smpte.hours--;
}
else {
smpte.minutes--;
}
} else {
smpte.seconds--;
}
} else {
smpte.frames--;
}
if (SMPTE_IS_ZERO( smpte )) {
smpte.negative = false;
}
return wrap;
}
/** Go to lowest absolute subframe value in this frame (set to 0 :-) ) */
void
frames_floor( Time& smpte )
{
smpte.subframes = 0;
if (SMPTE_IS_ZERO(smpte)) {
smpte.negative = false;
}
}
/** Increment @a smpte by one subframe */
Wrap
increment_subframes( Time& smpte )
{
Wrap wrap = NONE;
if (smpte.negative) {
smpte.negative = false;
wrap = decrement_subframes( smpte );
if (!SMPTE_IS_ZERO(smpte)) {
smpte.negative = true;
}
return wrap;
}
smpte.subframes++;
if (smpte.subframes >= ARDOUR::Config->get_subframes_per_frame()) {
smpte.subframes = 0;
increment( smpte );
return FRAMES;
}
return NONE;
}
/** Decrement @a smpte by one subframe */
Wrap
decrement_subframes( Time& smpte )
{
Wrap wrap = NONE;
if (smpte.negative) {
smpte.negative = false;
wrap = increment_subframes( smpte );
smpte.negative = true;
return wrap;
}
if (smpte.subframes <= 0) {
smpte.subframes = 0;
if (SMPTE_IS_ZERO(smpte)) {
smpte.negative = true;
smpte.subframes = 1;
return FRAMES;
} else {
decrement( smpte );
smpte.subframes = 79;
return FRAMES;
}
} else {
smpte.subframes--;
if (SMPTE_IS_ZERO(smpte)) {
smpte.negative = false;
}
return NONE;
}
}
/** Go to next whole second (frames == 0 or frames == 2) */
Wrap
increment_seconds( Time& smpte )
{
Wrap wrap = NONE;
// Clear subframes
frames_floor( smpte );
if (smpte.negative) {
// Wrap second if on second boundary
wrap = increment(smpte);
// Go to lowest absolute frame value
seconds_floor( smpte );
if (SMPTE_IS_ZERO(smpte)) {
smpte.negative = false;
}
} else {
// Go to highest possible frame in this second
switch ((int)ceil(smpte.rate)) {
case 24:
smpte.frames = 23;
break;
case 25:
smpte.frames = 24;
break;
case 30:
smpte.frames = 29;
break;
case 60:
smpte.frames = 59;
break;
}
// Increment by one frame
wrap = increment( smpte );
}
return wrap;
}
/** Go to lowest (absolute) frame value in this second
* Doesn't care about positive/negative */
void
seconds_floor( Time& smpte )
{
// Clear subframes
frames_floor( smpte );
// Go to lowest possible frame in this second
switch ((int)ceil(smpte.rate)) {
case 24:
case 25:
case 30:
case 60:
if (!(smpte.drop)) {
smpte.frames = 0;
} else {
if ((smpte.minutes % 10) && (smpte.seconds == 0)) {
smpte.frames = 2;
} else {
smpte.frames = 0;
}
}
break;
}
if (SMPTE_IS_ZERO(smpte)) {
smpte.negative = false;
}
}
/** Go to next whole minute (seconds == 0, frames == 0 or frames == 2) */
Wrap
increment_minutes( Time& smpte )
{
Wrap wrap = NONE;
// Clear subframes
frames_floor( smpte );
if (smpte.negative) {
// Wrap if on minute boundary
wrap = increment_seconds( smpte );
// Go to lowest possible value in this minute
minutes_floor( smpte );
} else {
// Go to highest possible second
smpte.seconds = 59;
// Wrap minute by incrementing second
wrap = increment_seconds( smpte );
}
return wrap;
}
/** Go to lowest absolute value in this minute */
void
minutes_floor( Time& smpte )
{
// Go to lowest possible second
smpte.seconds = 0;
// Go to lowest possible frame
seconds_floor( smpte );
if (SMPTE_IS_ZERO(smpte)) {
smpte.negative = false;
}
}
/** Go to next whole hour (minute = 0, second = 0, frame = 0) */
Wrap
increment_hours( Time& smpte )
{
Wrap wrap = NONE;
// Clear subframes
frames_floor(smpte);
if (smpte.negative) {
// Wrap if on hour boundary
wrap = increment_minutes( smpte );
// Go to lowest possible value in this hour
hours_floor( smpte );
} else {
smpte.minutes = 59;
wrap = increment_minutes( smpte );
}
return wrap;
}
/** Go to lowest absolute value in this hour */
void
hours_floor( Time& smpte )
{
smpte.minutes = 0;
smpte.seconds = 0;
smpte.frames = 0;
smpte.subframes = 0;
if (SMPTE_IS_ZERO(smpte)) {
smpte.negative = false;
}
}
} // namespace SMPTE
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