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4269bccfeb
livetrax/libs/timecode/src/time.cc
Robin Gareus 4269bccfeb fix drop-frame TC subframe rounding 
git-svn-id: svn://localhost/ardour2/branches/3.0@13523 d708f5d6-7413-0410-9779-e7cbd77b26cf
2012-11-18 09:53:11 +00:00

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/*
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 <stdio.h>
#include <stdlib.h>
#include "timecode/time.h"
namespace Timecode {
double 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;
}
}
double
timecode_to_frames_per_second(TimecodeFormat t)
{
switch (t) {
case timecode_23976:
return (24000.0/1001.0); //23.976;
break;
case timecode_24:
return 24;
break;
case timecode_24976:
return (25000.0/1001.0); //24.976;
break;
case timecode_25:
return 25;
break;
case timecode_2997:
return (30000.0/1001.0); //29.97;
break;
case timecode_2997drop:
return (30000.0/1001.0); //29.97;
break;
case timecode_2997000:
return 29.97;
break;
case timecode_2997000drop:
return 29.97;
break;
case timecode_30:
return 30;
break;
case timecode_30drop:
return 30;
break;
case timecode_5994:
return (60000.0/1001.0); //59.94;
break;
case timecode_60:
return 60;
break;
default:
//std::cerr << "Editor received unexpected timecode type" << std::endl;
break;
}
return 30.0;
}
bool
timecode_has_drop_frames(TimecodeFormat t)
{
switch (t) {
case timecode_23976:
return false;
break;
case timecode_24:
return false;
break;
case timecode_24976:
return false;
break;
case timecode_25:
return false;
break;
case timecode_2997:
return false;
break;
case timecode_2997drop:
return true;
break;
case timecode_2997000:
return false;
break;
case timecode_2997000drop:
return true;
break;
case timecode_30:
return false;
break;
case timecode_30drop:
return true;
break;
case timecode_5994:
return false;
break;
case timecode_60:
return false;
break;
default:
//error << "Editor received unexpected timecode type" << endmsg;
break;
}
return false;
}
std::string
timecode_format_name (TimecodeFormat const t)
{
switch (t) {
case timecode_23976:
return "23.98";
break;
case timecode_24:
return "24";
break;
case timecode_24976:
return "24.98";
break;
case timecode_25:
return "25";
break;
case timecode_2997000:
case timecode_2997:
return "29.97";
break;
case timecode_2997000drop:
case timecode_2997drop:
return "29.97 drop";
break;
case timecode_30:
return "30";
break;
case timecode_30drop:
return "30 drop";
break;
case timecode_5994:
return "59.94";
break;
case timecode_60:
return "60";
break;
default:
break;
}
return "??";
}
std::string timecode_format_time (Timecode::Time TC)
{
char buf[32];
if (TC.negative) {
snprintf (buf, sizeof (buf), "-%02" PRIu32 ":%02" PRIu32 ":%02" PRIu32 "%c%02" PRIu32,
TC.hours, TC.minutes, TC.seconds, TC.drop ? ';' : ':', TC.frames);
} else {
snprintf (buf, sizeof (buf), " %02" PRIu32 ":%02" PRIu32 ":%02" PRIu32 "%c%02" PRIu32,
TC.hours, TC.minutes, TC.seconds, TC.drop ? ';' : ':', TC.frames);
}
return std::string(buf);
}
std::string timecode_format_sampletime (
int64_t sample,
double sample_frame_rate,
double timecode_frames_per_second, bool timecode_drop_frames)
{
Time t;
sample_to_timecode(
sample, t, false, false,
timecode_frames_per_second, timecode_drop_frames,
sample_frame_rate,
80, false, 0);
return timecode_format_time(t);
}
bool parse_timecode_format(std::string tc, Timecode::Time &TC) {
char negative[2];
char ignored[2];
TC.subframes = 0;
if (sscanf (tc.c_str(), "%[- ]%" PRId32 ":%" PRId32 ":%" PRId32 "%[:;]%" PRId32,
negative, &TC.hours, &TC.minutes, &TC.seconds, ignored, &TC.frames) != 6) {
TC.hours = TC.minutes = TC.seconds = TC.frames = 0;
TC.negative = false;
return false;
}
if (negative[0]=='-') {
TC.negative = true;
} else {
TC.negative = false;
}
return true;
}
void
timecode_to_sample(
Timecode::Time& timecode, int64_t& sample,
bool use_offset, bool use_subframes,
/* Note - framerate info is taken from Timecode::Time& */
double sample_frame_rate /**< may include pull up/down */,
uint32_t subframes_per_frame,
/* optional offset - can be improved: function pointer to lazily query this*/
bool offset_is_negative, int64_t offset_samples
)
{
const double frames_per_timecode_frame = (double) sample_frame_rate / (double) timecode.rate;
if (timecode.drop) {
// The drop frame format was created to better approximate the 30000/1001 = 29.97002997002997....
// framerate of NTSC color TV. The used frame rate of drop frame is 29.97, which drifts by about
// 0.108 frame per hour, or about 1.3 frames per 12 hours. This is not perfect, but a lot better
// than using 30 non drop, which will drift with about 1.8 frame per minute.
// Using 29.97, drop frame real time can be accurate only every 10th minute (10 minutes of 29.97 fps
// is exactly 17982 frames). One minute is 1798.2 frames, but we count 30 frames per second
// (30 * 60 = 1800). This means that at the first minute boundary (at the end of 0:0:59:29) we
// are 1.8 frames too late relative to real time. By dropping 2 frames (jumping to 0:1:0:2) we are
// approx. 0.2 frames too early. This adds up with 0.2 too early for each minute until we are 1.8
// frames too early at 0:9:0:2 (9 * 0.2 = 1.8). The 10th minute brings us 1.8 frames later again
// (at end of 0:9:59:29), which sums up to 0 (we are back to zero at 0:10:0:0 :-).
//
// In table form:
//
// Timecode value frames offset subframes offset seconds (rounded) 44100 sample (rounded)
// 0:00:00:00 0.0 0 0.000 0 (accurate)
// 0:00:59:29 1.8 144 60.027 2647177
// 0:01:00:02 -0.2 -16 60.060 2648648
// 0:01:59:29 1.6 128 120.020 5292883
// 0:02:00:02 -0.4 -32 120.053 5294354
// 0:02:59:29 1.4 112 180.013 7938588
// 0:03:00:02 -0.6 -48 180.047 7940060
// 0:03:59:29 1.2 96 240.007 10584294
// 0:04:00:02 -0.8 -64 240.040 10585766
// 0:04:59:29 1.0 80 300.000 13230000
// 0:05:00:02 -1.0 -80 300.033 13231471
// 0:05:59:29 0.8 64 359.993 15875706
// 0:06:00:02 -1.2 -96 360.027 15877177
// 0:06:59:29 0.6 48 419.987 18521411
// 0:07:00:02 -1.4 -112 420.020 18522883
// 0:07:59:29 0.4 32 478.980 21167117
// 0:08:00:02 -1.6 -128 480.013 21168589
// 0:08:59:29 0.2 16 539.973 23812823
// 0:09:00:02 -1.8 -144 540.007 23814294
// 0:09:59:29 0.0+ 0+ 599.967 26458529
// 0:10:00:00 0.0 0 600.000 26460000 (accurate)
//
// Per Sigmond <per@sigmond.no>
//
// This schma would compensate exactly for a frame-rate of 30 * 0.999. but the
// actual rate is 30000/1001 - which results in an offset of -3.6ms per hour or
// about -86ms over a 24-hour period. (SMPTE 12M-1999)
//
// Robin Gareus <robin@gareus.org>
const int64_t fps_i = ceil(timecode.rate);
int64_t totalMinutes = 60 * timecode.hours + timecode.minutes;
int64_t frameNumber = fps_i * 3600 * timecode.hours
+ fps_i * 60 * timecode.minutes
+ fps_i * timecode.seconds + timecode.frames
- 2 * (totalMinutes - totalMinutes / 10);
sample = frameNumber * sample_frame_rate / (double) timecode.rate;
} else {
/*
Non drop is easy.. just note the use of
rint(timecode.rate) * frames_per_timecode_frame
(frames per Timecode second), which is larger than
frame_rate() in the non-integer Timecode rate case.
*/
sample = (int64_t)rint((((timecode.hours * 60 * 60) + (timecode.minutes * 60) + timecode.seconds) * (rint(timecode.rate) * frames_per_timecode_frame)) + (timecode.frames * frames_per_timecode_frame));
}
if (use_subframes) {
sample += (int64_t) rint(((double)timecode.subframes * frames_per_timecode_frame) / (double)subframes_per_frame);
}
if (use_offset) {
if (offset_is_negative) {
if (sample >= offset_samples) {
sample -= offset_samples;
} else {
/* Prevent song-time from becoming negative */
sample = 0;
}
} else {
if (timecode.negative) {
if (sample <= offset_samples) {
sample = offset_samples - sample;
} else {
sample = 0;
}
} else {
sample += offset_samples;
}
}
}
}
void
sample_to_timecode (
int64_t sample, Timecode::Time& timecode,
bool use_offset, bool use_subframes,
/* framerate info */
double timecode_frames_per_second,
bool timecode_drop_frames,
double sample_frame_rate/**< can include pull up/down */,
uint32_t subframes_per_frame,
/* optional offset - can be improved: function pointer to lazily query this*/
bool offset_is_negative, int64_t offset_samples
)
{
int64_t offset_sample;
if (!use_offset) {
timecode.negative = (sample < 0);
offset_sample = llabs(sample);
} else {
if (offset_is_negative) {
offset_sample = sample + offset_samples;
timecode.negative = false;
} else {
if (sample < offset_samples) {
offset_sample = (offset_samples - sample);
timecode.negative = true;
} else {
offset_sample = sample - offset_samples;
timecode.negative = false;
}
}
}
if (timecode_drop_frames) {
int64_t frameNumber = floor( (double)offset_sample * timecode_frames_per_second / sample_frame_rate);
/* there are 17982 frames in 10 min @ 29.97df */
const int64_t D = frameNumber / 17982;
const int64_t M = frameNumber % 17982;
timecode.subframes = rint(subframes_per_frame
* ((double)offset_sample * timecode_frames_per_second / sample_frame_rate - (double)frameNumber));
if (timecode.subframes == subframes_per_frame) {
timecode.subframes = 0;
frameNumber++;
}
frameNumber += 18*D + 2*((M - 2) / 1798);
timecode.frames = frameNumber % 30;
timecode.seconds = (frameNumber / 30) % 60;
timecode.minutes = ((frameNumber / 30) / 60) % 60;
timecode.hours = (((frameNumber / 30) / 60) / 60);
} else {
double timecode_frames_left_exact;
double timecode_frames_fraction;
int64_t timecode_frames_left;
const double frames_per_timecode_frame = sample_frame_rate / timecode_frames_per_second;
const int64_t frames_per_hour = (int32_t)(3600 * rint(timecode_frames_per_second) * frames_per_timecode_frame);
timecode.hours = offset_sample / frames_per_hour;
// Extract whole hours. Do this to prevent rounding errors with
// high sample numbers in the calculations that follow.
timecode_frames_left_exact = (double)(offset_sample % frames_per_hour) / frames_per_timecode_frame;
timecode_frames_fraction = timecode_frames_left_exact - floor( timecode_frames_left_exact );
timecode.subframes = (int32_t) rint(timecode_frames_fraction * subframes_per_frame);
timecode_frames_left = (int64_t) floor (timecode_frames_left_exact);
if (timecode.subframes == subframes_per_frame) {
timecode_frames_left++;
timecode.subframes = 0;
}
timecode.minutes = timecode_frames_left / ((int32_t) rint (timecode_frames_per_second) * 60);
timecode_frames_left = timecode_frames_left % ((int32_t) rint (timecode_frames_per_second) * 60);
timecode.seconds = timecode_frames_left / (int32_t) rint(timecode_frames_per_second);
timecode.frames = timecode_frames_left % (int32_t) rint(timecode_frames_per_second);
}
if (!use_subframes) {
timecode.subframes = 0;
}
/* set frame rate and drop frame */
timecode.rate = timecode_frames_per_second;
timecode.drop = timecode_drop_frames;
}
} // namespace Timecode
std::ostream&
operator<<(std::ostream& ostr, const Timecode::Time& t)
{
return t.print (ostr);
}
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