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Aegisub/aegisub/vfr.cpp

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// Copyright (c) 2005-2006, Rodrigo Braz Monteiro, Fredrik Mellbin
// 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
//
///////////
// Headers
#include <wx/filename.h>
#include "options.h"
#include "vfr.h"
#include "utils.h"
#include "text_file_reader.h"
#include "text_file_writer.h"
/////////////////////
// V2 Clear function
void FrameRate::Clear () {
Frame.clear();
}
////////////////
// V2 Add frame
void FrameRate::AddFrame(int ms) {
Frame.push_back(ms);
}
//////////////////
// V2 Get Average
void FrameRate::CalcAverage() {
if (Frame.size() <= 1)
throw _("No timecodes to average");
AverageFrameRate = double(Frame.back()) / (Frame.size()-1);
}
//////////////////////// FrameRate //////////////////////
///////////////
// Constructor
FrameRate::FrameRate() {
Unload();
}
//////////////
// Destructor
FrameRate::~FrameRate() {
Unload();
}
//////////////////
// Loads VFR file
void FrameRate::Load(wxString filename) {
using namespace std;
Unload();
// Check if file exists
wxFileName filetest(filename);
if (!filetest.FileExists()) throw _T("File not found.");
// Open file
TextFileReader file(filename);
try {
// Read header
wxString curLine;
curLine = file.ReadLineFromFile();
wxString header = curLine;
bool first = (header.Left(7).Lower() == _T("assume "));
// V1, code converted from avcvfr9
if (header == _T("# timecode format v1") || first) {
// Locate the default fps line
do {
// Get next line
if (!first) curLine = file.ReadLineFromFile();
first = false;
// Skip empty lines and comments
if (curLine == _T("") || curLine.Left(1) == _T("#")) continue;
else if (curLine.Left(7).Lower() != _T("assume ")) throw _T("Encountered data before 'Assume <fps>' line");
else {
if (!curLine.Mid(6).ToDouble(&AverageFrameRate) || AverageFrameRate <= 0) throw _T("Invalid 'Assume <fps>' line");
break;
}
} while (file.HasMoreLines());
// Read and expand all timecodes to v2
wxString curline;
double currenttime = 0;
int lposition = -1;
long lstart;
long lend;
double lfps;
while (file.HasMoreLines()) {
curLine = file.ReadLineFromFile();
// Skip empty lines and comments
if (curLine == _T("") || curLine.Left(1) == _T("#"))
continue;
wxString tmp = curLine.AfterFirst(_T(','));
wxString temp = curLine.BeforeFirst(_T(','));
if (!temp.ToLong(&lstart) || lstart < 0)
throw _T("Timecode parsing error, invalid start format found");
temp = tmp.BeforeLast(_T(','));
if (!temp.ToLong(&lend) || lend < 0)
throw _T("Timecode parsing error, invalid end format found");
temp = tmp.AfterLast(_T(','));
if (!temp.ToDouble(&lfps) || lfps <= 0)
throw _T("Timecode parsing error, invalid fps format found");
for (int i = 0; i <= lstart - lposition - 2; i++)
AddFrame((int)(floor(currenttime+(i*1000) / AverageFrameRate)));
currenttime += ((lstart - lposition - 1)*1000) / AverageFrameRate;
for (int i = 0; i <= lend - lstart; i++)
AddFrame((int)(floor(currenttime+(i*1000) / lfps)));
currenttime += ((lend - lstart + 1)*1000) / lfps;
lposition = lend;
}
last_time = currenttime;
last_frame = (int)Frame.size();
}
// V2
else if (header == _T("# timecode format v2")) {
// Assigns new VFR file
FrameRateType = VFR;
long lftime = -1;
long cftime = 0;
last_frame = 0;
// Reads body
while (file.HasMoreLines()) {
curLine = file.ReadLineFromFile();
//skip empty lines and comments
if (curLine == _T("") || curLine.Left(1) == _T("#"))
continue;
wxString tmp = curLine.BeforeFirst(_T('.'));
tmp.ToLong(&cftime);
if (lftime >= cftime)
throw _T("Out of order/too close timecodes found");
AddFrame(cftime);
lftime = cftime;
}
last_time = cftime;
last_frame = (int)Frame.size();
CalcAverage();
}
// Unknown
else {
throw _T("Unknown time code file format.");
}
}
catch (...) {
Unload();
throw;
}
// Close file
loaded = true;
vfrFile = filename;
FrameRateType = VFR;
// Add to recent
Options.AddToRecentList(filename,_T("Recent timecodes"));
}
////////
// Save
void FrameRate::Save(wxString filename) {
TextFileWriter file(filename,_T("ASCII"));
file.WriteLineToFile(_T("# timecode format v2"));
for (size_t i=0;i<Frame.size();i++) {
file.WriteLineToFile(wxString::Format(_T("%f"),(float)Frame[i]));
}
}
//////////
// Unload
void FrameRate::Unload () {
FrameRateType = NONE;
AverageFrameRate = 0;
last_time = 0;
last_frame = 0;
Clear();
loaded = false;
vfrFile = _T("");
}
///////////////
// Sets to CFR
void FrameRate::SetCFR(double fps) {
Unload();
loaded = true;
FrameRateType = CFR;
AverageFrameRate = fps;
}
///////////////
// Sets to VFR
void FrameRate::SetVFR(std::vector<int> newTimes) {
// Prepare
Unload();
loaded = true;
FrameRateType = VFR;
// Set new VFR;
Frame = newTimes;
CalcAverage();
last_time = newTimes.back();
last_frame = (int)newTimes.size();
}
/////////////////////////////
// Gets frame number at time
int FrameRate::PFrameAtTime(int ms,bool useceil) {
// Check if it's loaded
if (!loaded) return -1;
// Normalize miliseconds
ms = MAX(ms,0);
// Get for constant frame rate
if (FrameRateType == CFR || Frame.size() == 0) {
double value = double(ms) * AverageFrameRate / 1000.0;
if (useceil) return (int)ceil(value);
else return (int)floor(value);
}
// Get for variable frame rate
else if (FrameRateType == VFR) {
// Get last
double trueLast;
//if (useceil) trueLast = ceil(last_time);
//else trueLast = floor(last_time);
trueLast = Frame[Frame.size()-1];
// Inside VFR range
if (ms < trueLast) {
// Prepare binary search
size_t start = 0;
size_t end = last_frame;
size_t cur;
bool largerEqual;
// Do binary search
while (start <= end) {
// Current frame being checked
cur = (start+end)>>1;
// Is it larger or equal to searched time?
largerEqual = Frame[cur] >= ms;
// If it is, is the previous smaller?
// If so, this is the frame we're looking for
if (largerEqual && (cur == 0 || Frame[cur-1] < ms)) {
if (useceil) return (int)cur;
return (int)(cur)-1;
}
// Not found, continue search
if (largerEqual) end = cur-1;
else start = cur+1;
}
}
// After VFR range
else {
if (useceil) return (int)(last_frame + ceil((ms-last_time) * AverageFrameRate / 1000));
else return (int)(last_frame + floor((ms-last_time) * AverageFrameRate / 1000));
}
}
return -1;
}
//////////////////////
// Gets time at frame
int FrameRate::PTimeAtFrame(int frame) {
// Not loaded
if (!loaded) return -1;
// For negative/zero times, fallback to zero
if (frame <= 0) return 0;
// Constant frame rate
if (FrameRateType == CFR || Frame.size() == 0) {
return (int)floor(double(frame) / AverageFrameRate * 1000.0);
}
// Variable frame rate
else if (FrameRateType == VFR) {
// Is it inside frame rate range? If so, just get the value from timecodes table
if (frame < (signed) Frame.size()) return Frame.at(frame);
// Otherwise, calculate it
else return (int)floor(Frame.back() + double(frame-Frame.size()+1) / AverageFrameRate * 1000.0);
}
// Unknown frame rate type
return -1;
}
/////////////////////////////
// Get correct frame at time
// returns the adjusted time for end frames when start=false
// otherwise for start frames
int FrameRate::GetFrameAtTime(int ms,bool start) {
return PFrameAtTime(ms,start);
}
/////////////////////////////
// Get correct time at frame
// compensates and returns an end time when start=false
int FrameRate::GetTimeAtFrame(int frame,bool start,bool exact) {
int finalTime;
// Exact, for display
if (exact) {
finalTime = PTimeAtFrame(frame);
}
// Adjusted, for subs sync
else {
if (start) {
finalTime = (PTimeAtFrame(frame-1) + PTimeAtFrame(frame))/2;
}
else {
//if (FrameRateType == VFR) finalTime = PTimeAtFrame(frame);
//else finalTime = (PTimeAtFrame(frame) + PTimeAtFrame(frame+1))/2;
finalTime = (PTimeAtFrame(frame) + PTimeAtFrame(frame+1))/2;
}
}
return finalTime;
}
////////////////////////////////////////
// Get the current list of frames/times
wxArrayInt FrameRate::GetFrameTimeList() {
wxArrayInt final;
for (unsigned int i=0;i<Frame.size();i++) final.Add(Frame[i]);
return final;
}
///////////////////////////////////////////
// Calculate the common FPS for evil stuff
// e.g., in a mix of 24fps and 30fps, returns 120fps
double FrameRate::GetCommonFPS() {
// Variables
int curDist;
int lastDist = 0;
int sectionStart = 0;
double curFps;
// List of likely frame rates
std::vector<double> frameRates;
frameRates.push_back(15.0 / 1.001);
frameRates.push_back(15);
frameRates.push_back(24.0 / 1.001);
frameRates.push_back(24);
frameRates.push_back(30.0 / 1.001);
frameRates.push_back(30);
frameRates.push_back(120.0 / 1.001);
frameRates.push_back(120);
// List of rates found
std::vector<double> found;
// Find the relative fps of each area
for (unsigned int i=1;i<Frame.size();i++) {
// Find the current frame distance
curDist = Frame[i]-Frame[i-1];
// See if it's close enough to the last
if ((abs(curDist - lastDist) < 2 || i-1 == (unsigned) sectionStart) && i != Frame.size()-1) {
lastDist = curDist;
continue;
}
// Calculate section fps
curFps = (i - sectionStart - 1) * 1000.0 / double(Frame[i-1]-Frame[sectionStart]);
sectionStart = i;
lastDist = curDist;
// See if it's close enough to one of the likely rates
for (unsigned int j=0;j<frameRates.size();j++) {
if (curFps-0.01 <= frameRates[j] && curFps+0.01 >= frameRates[j]) {
curFps = frameRates[j];
break;
}
}
// See if it's on list
bool onList = false;
for (unsigned int j=0;j<found.size();j++) {
if (found[j] == curFps) {
onList = true;
break;
}
}
// If not, add it
if (!onList) found.push_back(curFps);
}
// Find common between them
double v1,v2,minInt,tempd;
int tempi1,tempi2;
while (found.size() > 1) {
// Extract last two values
v1 = found.back();
found.pop_back();
v2 = found.back();
found.pop_back();
// Divide them
v2 = v1/v2;
// Find what it takes to make it an integer
for (minInt = 1;minInt<20;minInt++) {
tempd = v2 * minInt;
tempi1 = (int)(tempd-0.001);
tempi2 = (int)(tempd+0.001);
if (tempi1 != tempi2) break;
}
if (minInt != 20) v1 = v1*minInt;
// See if it's close enough to one of the likely rates
for (unsigned int j=0;j<frameRates.size();j++) {
if (v1-0.01 <= frameRates[j] && v1+0.01 >= frameRates[j]) {
v1 = frameRates[j];
break;
}
}
// Re-insert obtained result
found.push_back(v1);
}
return found.back();
}
///////////
// Globals
FrameRate VFR_Output;
FrameRate VFR_Input;
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