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livetrax/libs/timecode/src/time.cc
David Robillard 9882fe9ab0 Clean up libtimecode, make license of bbt_time.h LGPL.
git-svn-id: svn://localhost/ardour2/branches/3.0@8272 d708f5d6-7413-0410-9779-e7cbd77b26cf
2010-12-14 19:07:50 +00:00

434 lines
8.9 KiB
C++

/*
Copyright (C) 2006-2010 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 Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#define Timecode_IS_AROUND_ZERO(sm) (!(sm).frames && !(sm).seconds && !(sm).minutes && !(sm).hours)
#define Timecode_IS_ZERO(sm) (!(sm).frames && !(sm).seconds && !(sm).minutes && !(sm).hours && !(sm.subframes))
#include <math.h>
#include "timecode/time.h"
namespace Timecode {
float Time::default_rate = 30.0;
/** Increment @a timecode by exactly one frame (keep subframes value).
* Realtime safe.
* @return true if seconds wrap.
*/
Wrap
increment (Time& timecode, uint32_t subframes_per_frame)
{
Wrap wrap = NONE;
if (timecode.negative) {
if (Timecode_IS_AROUND_ZERO (timecode) && timecode.subframes) {
// We have a zero transition involving only subframes
timecode.subframes = subframes_per_frame - timecode.subframes;
timecode.negative = false;
return SECONDS;
}
timecode.negative = false;
wrap = decrement (timecode, subframes_per_frame);
if (!Timecode_IS_ZERO (timecode)) {
timecode.negative = true;
}
return wrap;
}
switch ((int)ceil (timecode.rate)) {
case 24:
if (timecode.frames == 23) {
timecode.frames = 0;
wrap = SECONDS;
}
break;
case 25:
if (timecode.frames == 24) {
timecode.frames = 0;
wrap = SECONDS;
}
break;
case 30:
if (timecode.drop) {
if (timecode.frames == 29) {
if (((timecode.minutes + 1) % 10) && (timecode.seconds == 59)) {
timecode.frames = 2;
}
else {
timecode.frames = 0;
}
wrap = SECONDS;
}
} else {
if (timecode.frames == 29) {
timecode.frames = 0;
wrap = SECONDS;
}
}
break;
case 60:
if (timecode.frames == 59) {
timecode.frames = 0;
wrap = SECONDS;
}
break;
}
if (wrap == SECONDS) {
if (timecode.seconds == 59) {
timecode.seconds = 0;
wrap = MINUTES;
if (timecode.minutes == 59) {
timecode.minutes = 0;
wrap = HOURS;
timecode.hours++;
} else {
timecode.minutes++;
}
} else {
timecode.seconds++;
}
} else {
timecode.frames++;
}
return wrap;
}
/** Decrement @a timecode by exactly one frame (keep subframes value)
* Realtime safe.
* @return true if seconds wrap. */
Wrap
decrement (Time& timecode, uint32_t subframes_per_frame)
{
Wrap wrap = NONE;
if (timecode.negative || Timecode_IS_ZERO (timecode)) {
timecode.negative = false;
wrap = increment (timecode, subframes_per_frame);
timecode.negative = true;
return wrap;
} else if (Timecode_IS_AROUND_ZERO (timecode) && timecode.subframes) {
// We have a zero transition involving only subframes
timecode.subframes = subframes_per_frame - timecode.subframes;
timecode.negative = true;
return SECONDS;
}
switch ((int)ceil (timecode.rate)) {
case 24:
if (timecode.frames == 0) {
timecode.frames = 23;
wrap = SECONDS;
}
break;
case 25:
if (timecode.frames == 0) {
timecode.frames = 24;
wrap = SECONDS;
}
break;
case 30:
if (timecode.drop) {
if ((timecode.minutes % 10) && (timecode.seconds == 0)) {
if (timecode.frames <= 2) {
timecode.frames = 29;
wrap = SECONDS;
}
} else if (timecode.frames == 0) {
timecode.frames = 29;
wrap = SECONDS;
}
} else {
if (timecode.frames == 0) {
timecode.frames = 29;
wrap = SECONDS;
}
}
break;
case 60:
if (timecode.frames == 0) {
timecode.frames = 59;
wrap = SECONDS;
}
break;
}
if (wrap == SECONDS) {
if (timecode.seconds == 0) {
timecode.seconds = 59;
wrap = MINUTES;
if (timecode.minutes == 0) {
timecode.minutes = 59;
wrap = HOURS;
timecode.hours--;
}
else {
timecode.minutes--;
}
} else {
timecode.seconds--;
}
} else {
timecode.frames--;
}
if (Timecode_IS_ZERO (timecode)) {
timecode.negative = false;
}
return wrap;
}
/** Go to lowest absolute subframe value in this frame (set to 0 :-)) */
void
frames_floor (Time& timecode)
{
timecode.subframes = 0;
if (Timecode_IS_ZERO (timecode)) {
timecode.negative = false;
}
}
/** Increment @a timecode by one subframe */
Wrap
increment_subframes (Time& timecode, uint32_t subframes_per_frame)
{
Wrap wrap = NONE;
if (timecode.negative) {
timecode.negative = false;
wrap = decrement_subframes (timecode, subframes_per_frame);
if (!Timecode_IS_ZERO (timecode)) {
timecode.negative = true;
}
return wrap;
}
timecode.subframes++;
if (timecode.subframes >= subframes_per_frame) {
timecode.subframes = 0;
increment (timecode, subframes_per_frame);
return FRAMES;
}
return NONE;
}
/** Decrement @a timecode by one subframe */
Wrap
decrement_subframes (Time& timecode, uint32_t subframes_per_frame)
{
Wrap wrap = NONE;
if (timecode.negative) {
timecode.negative = false;
wrap = increment_subframes (timecode, subframes_per_frame);
timecode.negative = true;
return wrap;
}
if (timecode.subframes <= 0) {
timecode.subframes = 0;
if (Timecode_IS_ZERO (timecode)) {
timecode.negative = true;
timecode.subframes = 1;
return FRAMES;
} else {
decrement (timecode, subframes_per_frame);
timecode.subframes = 79;
return FRAMES;
}
} else {
timecode.subframes--;
if (Timecode_IS_ZERO (timecode)) {
timecode.negative = false;
}
return NONE;
}
}
/** Go to next whole second (frames == 0 or frames == 2) */
Wrap
increment_seconds (Time& timecode, uint32_t subframes_per_frame)
{
Wrap wrap = NONE;
// Clear subframes
frames_floor (timecode);
if (timecode.negative) {
// Wrap second if on second boundary
wrap = increment (timecode, subframes_per_frame);
// Go to lowest absolute frame value
seconds_floor (timecode);
if (Timecode_IS_ZERO (timecode)) {
timecode.negative = false;
}
} else {
// Go to highest possible frame in this second
switch ((int)ceil (timecode.rate)) {
case 24:
timecode.frames = 23;
break;
case 25:
timecode.frames = 24;
break;
case 30:
timecode.frames = 29;
break;
case 60:
timecode.frames = 59;
break;
}
// Increment by one frame
wrap = increment (timecode, subframes_per_frame);
}
return wrap;
}
/** Go to lowest (absolute) frame value in this second
* Doesn't care about positive/negative */
void
seconds_floor (Time& timecode)
{
// Clear subframes
frames_floor (timecode);
// Go to lowest possible frame in this second
switch ((int)ceil (timecode.rate)) {
case 24:
case 25:
case 30:
case 60:
if (!(timecode.drop)) {
timecode.frames = 0;
} else {
if ((timecode.minutes % 10) && (timecode.seconds == 0)) {
timecode.frames = 2;
} else {
timecode.frames = 0;
}
}
break;
}
if (Timecode_IS_ZERO (timecode)) {
timecode.negative = false;
}
}
/** Go to next whole minute (seconds == 0, frames == 0 or frames == 2) */
Wrap
increment_minutes (Time& timecode, uint32_t subframes_per_frame)
{
Wrap wrap = NONE;
// Clear subframes
frames_floor (timecode);
if (timecode.negative) {
// Wrap if on minute boundary
wrap = increment_seconds (timecode, subframes_per_frame);
// Go to lowest possible value in this minute
minutes_floor (timecode);
} else {
// Go to highest possible second
timecode.seconds = 59;
// Wrap minute by incrementing second
wrap = increment_seconds (timecode, subframes_per_frame);
}
return wrap;
}
/** Go to lowest absolute value in this minute */
void
minutes_floor (Time& timecode)
{
// Go to lowest possible second
timecode.seconds = 0;
// Go to lowest possible frame
seconds_floor (timecode);
if (Timecode_IS_ZERO (timecode)) {
timecode.negative = false;
}
}
/** Go to next whole hour (minute = 0, second = 0, frame = 0) */
Wrap
increment_hours (Time& timecode, uint32_t subframes_per_frame)
{
Wrap wrap = NONE;
// Clear subframes
frames_floor (timecode);
if (timecode.negative) {
// Wrap if on hour boundary
wrap = increment_minutes (timecode, subframes_per_frame);
// Go to lowest possible value in this hour
hours_floor(timecode);
} else {
timecode.minutes = 59;
wrap = increment_minutes (timecode, subframes_per_frame);
}
return wrap;
}
/** Go to lowest absolute value in this hour */
void
hours_floor(Time& timecode)
{
timecode.minutes = 0;
timecode.seconds = 0;
timecode.frames = 0;
timecode.subframes = 0;
if (Timecode_IS_ZERO (timecode)) {
timecode.negative = false;
}
}
} // namespace Timecode
std::ostream&
operator<<(std::ostream& ostr, const Timecode::Time& t)
{
return t.print (ostr);
}