/*
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_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 {
-float Time::default_rate = 30.0;
+double Time::default_rate = 30.0;
/** Increment @a timecode by exactly one frame (keep subframes value).
timecode.negative = false;
return SECONDS;
}
-
+
timecode.negative = false;
wrap = decrement (timecode, subframes_per_frame);
if (!Timecode_IS_ZERO (timecode)) {
}
break;
}
-
+
if (wrap == SECONDS) {
if (timecode.seconds == 59) {
timecode.seconds = 0;
} else {
timecode.frames++;
}
-
+
return 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 SECONDS;
}
-
+
switch ((int)ceil (timecode.rate)) {
case 24:
if (timecode.frames == 0) {
timecode.frames = 29;
wrap = SECONDS;
}
-
+
} else {
if (timecode.frames == 0) {
timecode.frames = 29;
}
break;
}
-
+
if (wrap == SECONDS) {
if (timecode.seconds == 0) {
timecode.seconds = 59;
} else {
timecode.frames--;
}
-
+
if (Timecode_IS_ZERO (timecode)) {
timecode.negative = false;
}
-
+
return 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);
}
return wrap;
}
-
+
timecode.subframes++;
if (timecode.subframes >= subframes_per_frame) {
timecode.subframes = 0;
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)) {
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);
timecode.frames = 59;
break;
}
-
+
// Increment by one frame
wrap = increment (timecode, subframes_per_frame);
}
-
+
return wrap;
}
{
// Clear subframes
frames_floor (timecode);
-
+
// Go to lowest possible frame in this second
switch ((int)ceil (timecode.rate)) {
case 24:
}
break;
}
-
+
if (Timecode_IS_ZERO (timecode)) {
timecode.negative = false;
}
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);
// Wrap minute by incrementing second
wrap = increment_seconds (timecode, subframes_per_frame);
}
-
+
return 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);
timecode.minutes = 59;
wrap = increment_minutes (timecode, subframes_per_frame);
}
-
+
return wrap;
}
timecode.seconds = 0;
timecode.frames = 0;
timecode.subframes = 0;
-
+
if (Timecode_IS_ZERO (timecode)) {
timecode.negative = false;
}
}
-float
+double
timecode_to_frames_per_second(TimecodeFormat t)
{
switch (t) {
break;
case timecode_2997:
- return 29.97;
+ 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;
case timecode_2997drop:
return true;
+ break;
+ case timecode_2997000:
+ return false;
+
+ break;
+ case timecode_2997000drop:
+ return true;
+
break;
case timecode_30:
return false;
return "25";
break;
+ case timecode_2997000:
case timecode_2997:
return "29.97";
break;
+ case timecode_2997000drop:
case timecode_2997drop:
return "29.97 drop";
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 = (int64_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 (use_subframes && timecode.subframes == subframes_per_frame) {
+ timecode_frames_left++;
+ timecode.subframes = 0;
+ }
+
+ timecode.minutes = timecode_frames_left / ((int32_t) lrint (timecode_frames_per_second) * 60);
+ timecode_frames_left = timecode_frames_left % ((int32_t) lrint (timecode_frames_per_second) * 60);
+ timecode.seconds = timecode_frames_left / (int32_t) lrint(timecode_frames_per_second);
+ timecode.frames = timecode_frames_left % (int32_t) lrint(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)
+std::ostream&
+operator<<(std::ostream& ostr, const Timecode::Time& t)
{
return t.print (ostr);
}
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