429 lines
8.2 KiB
C++
429 lines
8.2 KiB
C++
/*
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Copyright (C) 2006 Paul Davis
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This program is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published
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by the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#define SMPTE_IS_AROUND_ZERO( sm ) (!(sm).frames && !(sm).seconds && !(sm).minutes && !(sm).hours)
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#define SMPTE_IS_ZERO( sm ) (!(sm).frames && !(sm).seconds && !(sm).minutes && !(sm).hours && !(sm.subframes))
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#include <control_protocol/smpte.h>
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#include <ardour/configuration.h>
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namespace SMPTE {
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float Time::default_rate = 30.0;
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/** Increment @a smpte by exactly one frame (keep subframes value).
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* Realtime safe.
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* @return true if seconds wrap.
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*/
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Wrap
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increment( Time& smpte )
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{
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Wrap wrap = NONE;
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if (smpte.negative) {
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if (SMPTE_IS_AROUND_ZERO(smpte) && smpte.subframes) {
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// We have a zero transition involving only subframes
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smpte.subframes = ARDOUR::Config->get_subframes_per_frame() - smpte.subframes;
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smpte.negative = false;
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return SECONDS;
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}
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smpte.negative = false;
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wrap = decrement( smpte );
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if (!SMPTE_IS_ZERO( smpte )) {
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smpte.negative = true;
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}
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return wrap;
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}
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switch ((int)ceil(smpte.rate)) {
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case 24:
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if (smpte.frames == 23) {
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smpte.frames = 0;
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wrap = SECONDS;
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}
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break;
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case 25:
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if (smpte.frames == 24) {
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smpte.frames = 0;
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wrap = SECONDS;
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}
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break;
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case 30:
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if (smpte.drop) {
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if (smpte.frames == 29) {
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if ( ((smpte.minutes + 1) % 10) && (smpte.seconds == 59) ) {
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smpte.frames = 2;
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}
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else {
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smpte.frames = 0;
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}
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wrap = SECONDS;
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}
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} else {
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if (smpte.frames == 29) {
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smpte.frames = 0;
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wrap = SECONDS;
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}
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}
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break;
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case 60:
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if (smpte.frames == 59) {
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smpte.frames = 0;
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wrap = SECONDS;
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}
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break;
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}
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if (wrap == SECONDS) {
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if (smpte.seconds == 59) {
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smpte.seconds = 0;
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wrap = MINUTES;
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if (smpte.minutes == 59) {
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smpte.minutes = 0;
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wrap = HOURS;
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smpte.hours++;
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} else {
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smpte.minutes++;
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}
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} else {
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smpte.seconds++;
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}
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} else {
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smpte.frames++;
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}
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return wrap;
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}
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/** Decrement @a smpte by exactly one frame (keep subframes value)
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* Realtime safe.
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* @return true if seconds wrap. */
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Wrap
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decrement( Time& smpte )
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{
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Wrap wrap = NONE;
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if (smpte.negative || SMPTE_IS_ZERO(smpte)) {
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smpte.negative = false;
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wrap = increment( smpte );
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smpte.negative = true;
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return wrap;
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} else if (SMPTE_IS_AROUND_ZERO(smpte) && smpte.subframes) {
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// We have a zero transition involving only subframes
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smpte.subframes = ARDOUR::Config->get_subframes_per_frame() - smpte.subframes;
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smpte.negative = true;
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return SECONDS;
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}
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switch ((int)ceil(smpte.rate)) {
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case 24:
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if (smpte.frames == 0) {
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smpte.frames = 23;
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wrap = SECONDS;
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}
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break;
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case 25:
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if (smpte.frames == 0) {
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smpte.frames = 24;
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wrap = SECONDS;
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}
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break;
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case 30:
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if (smpte.drop) {
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if ((smpte.minutes % 10) && (smpte.seconds == 0)) {
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if (smpte.frames <= 2) {
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smpte.frames = 29;
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wrap = SECONDS;
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}
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} else if (smpte.frames == 0) {
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smpte.frames = 29;
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wrap = SECONDS;
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}
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} else {
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if (smpte.frames == 0) {
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smpte.frames = 29;
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wrap = SECONDS;
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}
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}
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break;
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case 60:
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if (smpte.frames == 0) {
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smpte.frames = 59;
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wrap = SECONDS;
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}
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break;
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}
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if (wrap == SECONDS) {
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if (smpte.seconds == 0) {
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smpte.seconds = 59;
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wrap = MINUTES;
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if (smpte.minutes == 0) {
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smpte.minutes = 59;
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wrap = HOURS;
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smpte.hours--;
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}
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else {
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smpte.minutes--;
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}
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} else {
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smpte.seconds--;
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}
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} else {
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smpte.frames--;
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}
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if (SMPTE_IS_ZERO( smpte )) {
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smpte.negative = false;
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}
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return wrap;
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}
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/** Go to lowest absolute subframe value in this frame (set to 0 :-) ) */
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void
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frames_floor( Time& smpte )
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{
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smpte.subframes = 0;
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if (SMPTE_IS_ZERO(smpte)) {
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smpte.negative = false;
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}
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}
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/** Increment @a smpte by one subframe */
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Wrap
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increment_subframes( Time& smpte )
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{
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Wrap wrap = NONE;
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if (smpte.negative) {
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smpte.negative = false;
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wrap = decrement_subframes( smpte );
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if (!SMPTE_IS_ZERO(smpte)) {
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smpte.negative = true;
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}
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return wrap;
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}
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smpte.subframes++;
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if (smpte.subframes >= ARDOUR::Config->get_subframes_per_frame()) {
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smpte.subframes = 0;
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increment( smpte );
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return FRAMES;
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}
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return NONE;
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}
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/** Decrement @a smpte by one subframe */
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Wrap
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decrement_subframes( Time& smpte )
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{
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Wrap wrap = NONE;
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if (smpte.negative) {
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smpte.negative = false;
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wrap = increment_subframes( smpte );
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smpte.negative = true;
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return wrap;
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}
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if (smpte.subframes <= 0) {
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smpte.subframes = 0;
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if (SMPTE_IS_ZERO(smpte)) {
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smpte.negative = true;
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smpte.subframes = 1;
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return FRAMES;
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} else {
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decrement( smpte );
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smpte.subframes = 79;
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return FRAMES;
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}
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} else {
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smpte.subframes--;
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if (SMPTE_IS_ZERO(smpte)) {
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smpte.negative = false;
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}
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return NONE;
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}
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}
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/** Go to next whole second (frames == 0 or frames == 2) */
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Wrap
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increment_seconds( Time& smpte )
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{
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Wrap wrap = NONE;
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// Clear subframes
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frames_floor( smpte );
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if (smpte.negative) {
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// Wrap second if on second boundary
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wrap = increment(smpte);
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// Go to lowest absolute frame value
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seconds_floor( smpte );
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if (SMPTE_IS_ZERO(smpte)) {
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smpte.negative = false;
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}
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} else {
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// Go to highest possible frame in this second
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switch ((int)ceil(smpte.rate)) {
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case 24:
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smpte.frames = 23;
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break;
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case 25:
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smpte.frames = 24;
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break;
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case 30:
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smpte.frames = 29;
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break;
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case 60:
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smpte.frames = 59;
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break;
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}
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// Increment by one frame
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wrap = increment( smpte );
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}
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return wrap;
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}
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/** Go to lowest (absolute) frame value in this second
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* Doesn't care about positive/negative */
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void
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seconds_floor( Time& smpte )
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{
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// Clear subframes
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frames_floor( smpte );
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// Go to lowest possible frame in this second
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switch ((int)ceil(smpte.rate)) {
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case 24:
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case 25:
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case 30:
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case 60:
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if (!(smpte.drop)) {
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smpte.frames = 0;
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} else {
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if ((smpte.minutes % 10) && (smpte.seconds == 0)) {
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smpte.frames = 2;
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} else {
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smpte.frames = 0;
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}
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}
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break;
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}
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if (SMPTE_IS_ZERO(smpte)) {
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smpte.negative = false;
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}
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}
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/** Go to next whole minute (seconds == 0, frames == 0 or frames == 2) */
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Wrap
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increment_minutes( Time& smpte )
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{
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Wrap wrap = NONE;
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// Clear subframes
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frames_floor( smpte );
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if (smpte.negative) {
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// Wrap if on minute boundary
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wrap = increment_seconds( smpte );
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// Go to lowest possible value in this minute
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minutes_floor( smpte );
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} else {
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// Go to highest possible second
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smpte.seconds = 59;
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// Wrap minute by incrementing second
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wrap = increment_seconds( smpte );
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}
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return wrap;
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}
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/** Go to lowest absolute value in this minute */
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void
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minutes_floor( Time& smpte )
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{
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// Go to lowest possible second
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smpte.seconds = 0;
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// Go to lowest possible frame
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seconds_floor( smpte );
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if (SMPTE_IS_ZERO(smpte)) {
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smpte.negative = false;
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}
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}
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/** Go to next whole hour (minute = 0, second = 0, frame = 0) */
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Wrap
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increment_hours( Time& smpte )
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{
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Wrap wrap = NONE;
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// Clear subframes
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frames_floor(smpte);
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if (smpte.negative) {
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// Wrap if on hour boundary
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wrap = increment_minutes( smpte );
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// Go to lowest possible value in this hour
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hours_floor( smpte );
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} else {
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smpte.minutes = 59;
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wrap = increment_minutes( smpte );
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}
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return wrap;
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}
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/** Go to lowest absolute value in this hour */
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void
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hours_floor( Time& smpte )
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{
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smpte.minutes = 0;
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smpte.seconds = 0;
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smpte.frames = 0;
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smpte.subframes = 0;
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if (SMPTE_IS_ZERO(smpte)) {
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smpte.negative = false;
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}
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}
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} // namespace SMPTE
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