Aegisub/aegisub/src/ass_time.cpp
2009-05-15 12:31:09 +00:00

444 lines
10 KiB
C++

// Copyright (c) 2005, Rodrigo Braz Monteiro
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
// * Neither the name of the Aegisub Group nor the names of its contributors
// may be used to endorse or promote products derived from this software
// without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//
// -----------------------------------------------------------------------------
//
// AEGISUB
//
// Website: http://aegisub.cellosoft.com
// Contact: mailto:zeratul@cellosoft.com
//
////////////
// Includes
#include "config.h"
#include <wx/regex.h>
#include <math.h>
#include <fstream>
#include <algorithm>
#include "ass_time.h"
#include "vfr.h"
#include "utils.h"
////////////////////// AssTime //////////////////////
// AssTime constructors
AssTime::AssTime () {
time = 0;
}
////////////////////
// Parses from ASS
// ---------------
// Note that this function is atomic, it won't touch the values if it's invalid.
void AssTime::ParseASS (const wxString text) {
// Prepare
size_t pos = 0;
size_t end = 0;
long th=0,tm=0,tms=0;
// Count the number of colons
size_t len = text.Length();
int colons = 0;
for (pos=0;pos<len;pos++) if (text[pos] == _T(':')) colons++;
pos = 0;
// Set start so that there are only two colons at most
if (colons > 2) {
for (pos=0;pos<len;pos++) {
if (text[pos] == _T(':')) {
colons--;
if (colons == 2) break;
}
}
pos++;
end = pos;
}
try {
// Hours
if (colons == 2) {
while (text[end++] != _T(':'));
th = AegiStringToInt(text,pos,end);
pos = end;
}
// Minutes
if (colons >= 1) {
while (text[end++] != _T(':'));
tm = AegiStringToInt(text,pos,end);
pos = end;
}
// Miliseconds (includes seconds)
end = text.Length();
tms = AegiStringToFix(text,3,pos,end);
}
// Something went wrong, don't change anything
catch (...) {
return;
}
// OK, set values
time = tms + tm*60000 + th*3600000;
}
///////////////////
// Parses from SRT
void AssTime::ParseSRT (const wxString _text) {
// Prepare
wxString text = _text;
text.Trim(false);
text.Trim(true);
long tempv;
wxString temp;
int ms,s,m,h;
// Parse
temp = text.Mid(0,2);
temp.ToLong(&tempv);
h = tempv;
temp = text.Mid(3,2);
temp.ToLong(&tempv);
m = tempv;
temp = text.Mid(6,2);
temp.ToLong(&tempv);
s = tempv;
temp = text.Mid(9,3);
temp.ToLong(&tempv);
ms = tempv;
// Set value
time = ms + s*1000 + m*60000 + h*3600000;
}
//////////////////////////////////////////
// AssTime conversion to/from miliseconds
int AssTime::GetMS () const {
if (!UseMSPrecision) return time/10*10;
else return time;
}
void AssTime::SetMS (int _ms) {
time = _ms;
}
////////////////
// ASS Formated
wxString AssTime::GetASSFormated (bool msPrecision) {
int h,m,s,ms;
int _ms = time;
// Centisecond precision
msPrecision = msPrecision || UseMSPrecision;
if (!msPrecision) _ms = _ms/10*10;
// Reset
h = m = s = ms = 0;
if (_ms < 0) _ms = 0;
// Hours
while (_ms >= 3600000) {
_ms -= 3600000;
h++;
}
// Ass overflow
if (h > 9) {
h = 9;
m = 59;
s = 59;
ms = 999;
}
// Minutes
while (_ms >= 60000) {
_ms -= 60000;
m++;
}
// Seconds
while (_ms >= 1000) {
_ms -= 1000;
s++;
}
ms = _ms;
if (msPrecision) return wxString::Format(_T("%01i:%02i:%02i.%03i"),h,m,s,ms);
else return wxString::Format(_T("%01i:%02i:%02i.%02i"),h,m,s,ms/10);
}
////////////////
// SRT Formated
wxString AssTime::GetSRTFormated () {
int h,m,s,ms;
int _ms = time;
// Centisecond precision
if (!UseMSPrecision) _ms = _ms/10*10;
// Reset
h = m = s = ms = 0;
if (_ms < 0) _ms = 0;
// Hours
while (_ms >= 3600000) {
_ms -= 3600000;
h++;
}
// Ass overflow
if (h > 9) {
h = 9;
m = 59;
s = 59;
ms = 999;
}
// Minutes
while (_ms >= 60000) {
_ms -= 60000;
m++;
}
// Seconds
while (_ms >= 1000) {
_ms -= 1000;
s++;
}
ms = _ms;
wxString result = wxString::Format(_T("%02i:%02i:%02i,%03i"),h,m,s,ms);
return result;
}
//////////////////////
// AssTime comparison
bool operator < (AssTime &t1, AssTime &t2) {
return (t1.GetMS() < t2.GetMS());
}
bool operator > (AssTime &t1, AssTime &t2) {
return (t1.GetMS() > t2.GetMS());
}
bool operator <= (AssTime &t1, AssTime &t2) {
return (t1.GetMS() <= t2.GetMS());
}
bool operator >= (AssTime &t1, AssTime &t2) {
return (t1.GetMS() >= t2.GetMS());
}
bool operator == (AssTime &t1, AssTime &t2) {
return (t1.GetMS() == t2.GetMS());
}
bool operator != (AssTime &t1, AssTime &t2) {
return (t1.GetMS() != t2.GetMS());
}
/////////////////
// Static option
bool AssTime::UseMSPrecision = false;
///////
// Get
int AssTime::GetTimeHours() { return time / 3600000; }
int AssTime::GetTimeMinutes() { return (time % 3600000)/60000; }
int AssTime::GetTimeSeconds() { return (time % 60000)/1000; }
int AssTime::GetTimeMiliseconds() { return (time % 1000); }
int AssTime::GetTimeCentiseconds() { return (time % 1000)/10; }
///////
// Constructor
FractionalTime::FractionalTime (wxString separator, int numerator, int denominator, bool dropframe) {
drop = dropframe;
if (drop) {
// no dropframe for any other framerates
num = 30000;
den = 1001;
} else {
num = numerator;
den = denominator;
}
sep = separator;
// fractions < 1 are not welcome here
if ((num <= 0 || den <= 0) || (num < den))
throw _T("FractionalTime: nonsensical enumerator or denominator");
if (sep.IsEmpty())
throw _T("FractionalTime: no separator specified");
}
///////
// Destructor
FractionalTime::~FractionalTime () {
sep.Clear();
}
///////
// SMPTE text string to milliseconds conversion
int FractionalTime::ToMillisecs (wxString _text) {
wxString text = _text;
wxString re_str = _T("");
text.Trim(false);
text.Trim(true);
long h=0,m=0,s=0,f=0;
// hour minute second fraction
re_str << _T("(\\d+)") << sep << _T("(\\d+)") << sep << _T("(\\d+)") << sep << _T("(\\d+)");
wxRegEx re(re_str, wxRE_ADVANCED);
if (!re.IsValid())
throw _T("FractionalTime: regex failure");
if (!re.Matches(text))
return 0; // FIXME: throw here too?
re.GetMatch(text,1).ToLong(&h);
re.GetMatch(text,2).ToLong(&m);
re.GetMatch(text,3).ToLong(&s);
re.GetMatch(text,4).ToLong(&f);
int msecs_f = 0;
int fn = 0;
// dropframe? do silly things
if (drop) {
fn += h * frames_per_period * 6;
fn += (m % 10) * frames_per_period;
if (m > 0) {
fn += 1800;
m--;
fn += m * 1798; // two timestamps dropped per minute after the first
fn += s * 30 + f - 2;
}
else { // minute is evenly divisible by 10, keep first two timestamps
fn += s * 30;
fn += f;
}
msecs_f = (fn * num) / den;
}
// no dropframe, may or may not sync with wallclock time
// (see comment in FromMillisecs for an explanation of why it's done like this)
else {
int fps_approx = floor((double(num)/double(den))+0.5);
fn += h * 3600 * fps_approx;
fn += m * 60 * fps_approx;
fn += s * fps_approx;
fn += f;
msecs_f = (fn * num) / den;
}
return msecs_f;
}
///////
// SMPTE text string to AssTime conversion
AssTime FractionalTime::ToAssTime (wxString _text) {
AssTime time;
time.SetMS((int)ToMillisecs(_text));
return time;
}
///////
// AssTime to SMPTE text string conversion
wxString FractionalTime::FromAssTime(AssTime time) {
return FromMillisecs(time.GetMS());
}
///////
// Milliseconds to SMPTE text string conversion
wxString FractionalTime::FromMillisecs(int64_t msec) {
int h=0, m=0, s=0, f=0; // hours, minutes, seconds, fractions
int fn = (msec*(int64_t)num) / (1000*den); // frame number
// return 00:00:00:00
if (msec <= 0)
goto RETURN;
// dropframe?
if (drop) {
fn += 2 * (fn / (30 * 60)) - 2 * (fn / (30 * 60 * 10));
h = fn / (30 * 60 * 60);
m = (fn / (30 * 60)) % 60;
s = (fn / 30) % 60;
f = fn % 30;
}
// no dropframe; h/m/s may or may not sync to wallclock time
else {
/*
This is truly the dumbest shit. What we're trying to ensure here
is that non-integer framerates are desynced from the wallclock
time by a correct amount of time. For example, in the
NTSC-without-dropframe case, 3600*num/den would be 107892
(when truncated to int), which is quite a good approximation of
how a long an hour is when counted in 30000/1001 frames per second.
Unfortunately, that's not what we want, since frame numbers will
still range from 00 to 29, meaning that we're really getting _30_
frames per second and not 29.97 and the full hour will be off by
almost 4 seconds (108000 frames versus 107892).
DEATH TO SMPTE
*/
int fps_approx = floor((double(num)/double(den))+0.5);
int frames_per_h = 3600*fps_approx;
int frames_per_m = 60*fps_approx;
int frames_per_s = fps_approx;
while (fn >= frames_per_h) {
h++; fn -= frames_per_h;
}
while (fn >= frames_per_m) {
m++; fn -= frames_per_m;
}
while (fn >= frames_per_s) {
s++; fn -= frames_per_s;
}
f = fn;
}
RETURN:
return wxString::Format(_T("%02i") + sep + _T("%02i") + sep + _T("%02i") + sep + _T("%02i"),h,m,s,f);
}