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-rw-r--r--libs/ardour/smpte.cc405
1 files changed, 0 insertions, 405 deletions
diff --git a/libs/ardour/smpte.cc b/libs/ardour/smpte.cc
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index 9ee582b802..0000000000
--- a/libs/ardour/smpte.cc
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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 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.,
- 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 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 <ardour/smpte.h>
-
-namespace SMPTE {
-
-FPS Time::default_rate = MTC_30_FPS;
-
-
-/** 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 = 80 - smpte.subframes;
- smpte.negative = false;
- return SECONDS;
- }
-
- smpte.negative = false;
- wrap = decrement( smpte );
- if (!SMPTE_IS_ZERO( smpte )) {
- smpte.negative = true;
- }
- return wrap;
- }
-
- switch (smpte.rate) {
- case MTC_24_FPS:
- if (smpte.frames == 23) {
- smpte.frames = 0;
- wrap = SECONDS;
- }
- break;
- case MTC_25_FPS:
- if (smpte.frames == 24) {
- smpte.frames = 0;
- wrap = SECONDS;
- }
- break;
- case MTC_30_FPS_DROP:
- if (smpte.frames == 29) {
- if ( ((smpte.minutes + 1) % 10) && (smpte.seconds == 59) ) {
- smpte.frames = 2;
- }
- else {
- smpte.frames = 0;
- }
- wrap = SECONDS;
- }
- break;
- case MTC_30_FPS:
- if (smpte.frames == 29) {
- 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 = 80 - smpte.subframes;
- smpte.negative = true;
- return SECONDS;
- }
-
- switch (smpte.rate) {
- case MTC_24_FPS:
- if (smpte.frames == 0) {
- smpte.frames = 23;
- wrap = SECONDS;
- }
- break;
- case MTC_25_FPS:
- if (smpte.frames == 0) {
- smpte.frames = 24;
- wrap = SECONDS;
- }
- break;
- case MTC_30_FPS_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;
- }
- break;
- case MTC_30_FPS:
- if (smpte.frames == 0) {
- smpte.frames = 29;
- 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 >= 80) {
- 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 (smpte.rate) {
- case MTC_24_FPS:
- smpte.frames = 23;
- break;
- case MTC_25_FPS:
- smpte.frames = 24;
- break;
- case MTC_30_FPS_DROP:
- case MTC_30_FPS:
- smpte.frames = 29;
- 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 (smpte.rate) {
- case MTC_24_FPS:
- case MTC_25_FPS:
- case MTC_30_FPS:
- smpte.frames = 0;
- break;
- case MTC_30_FPS_DROP:
- 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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