/*
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.
#include <math.h>
#include <stdio.h>
+#include <stdlib.h>
#include "timecode/time.h"
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;
}
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_2997000:
- return "29.97000";
-
- break;
- case timecode_2997000drop:
- return "29.97000 drop";
-
break;
case timecode_30:
return "30";
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,
// 0:10:00:00 0.0 0 600.000 26460000 (accurate)
//
// Per Sigmond <per@sigmond.no>
-
- // Samples inside time dividable by 10 minutes (real time accurate)
- int64_t base_samples = (int64_t) (((timecode.hours * 107892) + ((timecode.minutes / 10) * 17982)) * frames_per_timecode_frame);
-
- // Samples inside time exceeding the nearest 10 minutes (always offset, see above)
- int32_t exceeding_df_minutes = timecode.minutes % 10;
- int32_t exceeding_df_seconds = (exceeding_df_minutes * 60) + timecode.seconds;
- int32_t exceeding_df_frames = (30 * exceeding_df_seconds) + timecode.frames - (2 * exceeding_df_minutes);
- int64_t exceeding_samples = (int64_t) rint(exceeding_df_frames * frames_per_timecode_frame);
- sample = base_samples + exceeding_samples;
+ //
+ // 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
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));
+ 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) (((double)timecode.subframes * frames_per_timecode_frame) / subframes_per_frame);
+ sample += (int64_t) rint(((double)timecode.subframes * frames_per_timecode_frame) / (double)subframes_per_frame);
}
if (use_offset) {
bool offset_is_negative, int64_t offset_samples
)
{
- const double frames_per_timecode_frame = (double) sample_frame_rate / (double) timecode_frames_per_second;
- int32_t frames_per_hour;
-
- if (timecode_drop_frames) {
- frames_per_hour = (int32_t)(107892 * frames_per_timecode_frame);
- } else {
- frames_per_hour = (int32_t)(3600 * rint(timecode_frames_per_second) * frames_per_timecode_frame);
- }
-
- /* do the work */
int64_t offset_sample;
if (!use_offset) {
- offset_sample = sample;
- timecode.negative = false;
+ timecode.negative = (sample < 0);
+ offset_sample = ::llabs(sample);
} else {
if (offset_is_negative) {
offset_sample = sample + offset_samples;
}
}
- double timecode_frames_left_exact;
- double timecode_frames_fraction;
- uint64_t timecode_frames_left;
+ if (timecode_drop_frames) {
+ int64_t frameNumber = floor( (double)offset_sample * timecode_frames_per_second / sample_frame_rate);
- // Extract whole hours. Do this to prevent rounding errors with
- // high sample numbers in the calculations that follow.
- timecode.hours = offset_sample / frames_per_hour;
- offset_sample = offset_sample % frames_per_hour;
+ /* there are 17982 frames in 10 min @ 29.97df */
+ const int64_t D = frameNumber / 17982;
+ const int64_t M = frameNumber % 17982;
- // Calculate exact number of (exceeding) timecode frames and fractional frames
- timecode_frames_left_exact = (double) offset_sample / frames_per_timecode_frame;
- timecode_frames_fraction = timecode_frames_left_exact - floor( timecode_frames_left_exact );
- timecode.subframes = (int32_t) floor(timecode_frames_fraction * subframes_per_frame);
+ timecode.subframes = rint(subframes_per_frame
+ * ((double)offset_sample * timecode_frames_per_second / sample_frame_rate - (double)frameNumber));
- // XXX Not sure if this is necessary anymore...
- if (timecode.subframes == subframes_per_frame) {
- // This can happen with 24 fps (and 29.97 fps ?)
- timecode_frames_left_exact = ceil( timecode_frames_left_exact );
- timecode.subframes = 0;
- }
+ if (timecode.subframes == subframes_per_frame) {
+ timecode.subframes = 0;
+ frameNumber++;
+ }
- // Extract hour-exceeding frames for minute, second and frame calculations
- timecode_frames_left = (uint64_t) floor (timecode_frames_left_exact);
+ frameNumber += 18*D + 2*((M - 2) / 1798);
- if (timecode_drop_frames) {
- // See int32_t explanation in timecode_to_sample()...
-
- // Number of 10 minute chunks
- timecode.minutes = (timecode_frames_left / 17982) * 10; // exactly 17982 frames in 10 minutes
- // frames exceeding the nearest 10 minute barrier
- int32_t exceeding_df_frames = timecode_frames_left % 17982;
-
- // Find minutes exceeding the nearest 10 minute barrier
- if (exceeding_df_frames >= 1800) { // nothing to do if we are inside the first minute (0-1799)
- exceeding_df_frames -= 1800; // take away first minute (different number of frames than the others)
- int32_t extra_minutes_minus_1 = exceeding_df_frames / 1798; // how many minutes after the first one
- exceeding_df_frames -= extra_minutes_minus_1 * 1798; // take away the (extra) minutes just found
- timecode.minutes += extra_minutes_minus_1 + 1; // update with exceeding minutes
- }
+ timecode.frames = frameNumber % 30;
+ timecode.seconds = (frameNumber / 30) % 60;
+ timecode.minutes = ((frameNumber / 30) / 60) % 60;
+ timecode.hours = (((frameNumber / 30) / 60) / 60);
- // Adjust frame numbering for dropped frames (frame 0 and 1 skipped at start of every minute except every 10th)
- if (timecode.minutes % 10) {
- // Every minute except every 10th
- if (exceeding_df_frames < 28) {
- // First second, frames 0 and 1 are skipped
- timecode.seconds = 0;
- timecode.frames = exceeding_df_frames + 2;
- } else {
- // All other seconds, all 30 frames are counted
- exceeding_df_frames -= 28;
- timecode.seconds = (exceeding_df_frames / 30) + 1;
- timecode.frames = exceeding_df_frames % 30;
- }
- } else {
- // Every 10th minute, all 30 frames counted in all seconds
- timecode.seconds = exceeding_df_frames / 30;
- timecode.frames = exceeding_df_frames % 30;
- }
} else {
- // Non drop is easy
- 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);
+ 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) {
} // 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);
}
projects / ardour.git / blobdiff