From 4b861e603972148a29638cade51cee27ebc997a2 Mon Sep 17 00:00:00 2001 From: David Robillard Date: Tue, 14 Dec 2010 18:13:37 +0000 Subject: Rename libmusictime libtimecode (consistent with already used namespace "Timecode"). Move BBT_Time to libtimecode. git-svn-id: svn://localhost/ardour2/branches/3.0@8271 d708f5d6-7413-0410-9779-e7cbd77b26cf --- libs/timecode/src/time.cc | 435 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 435 insertions(+) create mode 100644 libs/timecode/src/time.cc (limited to 'libs/timecode/src/time.cc') diff --git a/libs/timecode/src/time.cc b/libs/timecode/src/time.cc new file mode 100644 index 0000000000..c87662a18c --- /dev/null +++ b/libs/timecode/src/time.cc @@ -0,0 +1,435 @@ +/* + 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 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 + +#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); +} -- cgit v1.2.3