Aegisub/core/vfr.cpp

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// Copyright (c) 2005-2006, Rodrigo Braz Monteiro, Fredrik Mellbin
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// 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 "vfr.h"
#include "utils.h"
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#include <wx/filename.h>
#include <fstream>
#include <algorithm>
/////////////////////
// V2 Clear function
void FrameRate::Clear () {
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Frame.clear();
}
////////////////
// V2 Add frame
void FrameRate::AddFrame(int ms) {
Frame.push_back(ms);
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}
//////////////////
// V2 Get Average
void FrameRate::CalcAverage() {
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if (Frame.size() <= 1)
throw _("No timecodes to average");
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AverageFrameRate = double(Frame.back()) / (Frame.size()-1);
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}
//////////////////////// FrameRate //////////////////////
///////////////
// Constructor
FrameRate::FrameRate() {
Unload();
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}
//////////////
// Destructor
FrameRate::~FrameRate() {
Unload();
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}
//////////////////
// Loads VFR file
void FrameRate::Load(wxString filename) {
using namespace std;
Unload();
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// Check if file exists
wxFileName filetest(filename);
if (!filetest.FileExists()) throw _T("File not found.");
// Open file
ifstream file;
file.open(filename.mb_str(wxConvLocal));
if (!file.is_open()) throw _T("Could not open file.");
try {
// Read header
char buffer[65536];
file.getline(buffer,65536);
wxString header(buffer,wxConvUTF8);
// V1, code converted from avcvfr9
if (header == _T("# timecode format v1")) {
//locate the default fps line
while (!file.eof()) {
file.getline(buffer,65536);
wxString curLine(buffer,wxConvUTF8);
//skip empty lines and comments
if (curLine == _T("") || curLine.Left(1) == _T("#"))
continue;
//fix me? should be case insensitive comparison
else if (curLine.Left(7) != _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;
}
}
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//read and expand all timecodes to v2
wxString curline;
double currenttime = 0;
int lposition = -1;
long lstart;
long lend;
double lfps;
while (!file.eof()) {
file.getline(buffer,65536);
wxString curLine(buffer,wxConvUTF8);
//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(floor(currenttime+(i*1000) / AverageFrameRate));
currenttime += ((lstart - lposition - 1)*1000) / AverageFrameRate;
for (int i = 0; i <= lend - lstart; i++)
AddFrame(floor(currenttime+(i*1000) / lfps));
currenttime += ((lend - lstart + 1)*1000) / lfps;
lposition = lend;
}
last_time = currenttime;
last_frame = Frame.size();
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}
// V2
else if (header == _T("# timecode format v2")) {
// Assigns new VFR file
FrameRateType = VFR;
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long lftime = -1;
long cftime = 0;
last_frame = 0;
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// Reads body
while (!file.eof()) {
file.getline (buffer,65536);
wxString curLine(buffer,wxConvUTF8);
//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 = Frame.size();
CalcAverage();
}
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// Unknown
else
throw _T("Unknown file format.");
// Run test
/*bool doTest = false;
if (doTest) {
int fail = 0;
int res;
for (int i=0;i<1000;i++) {
res = GetFrameAtTime(GetTimeAtFrame(i));
if (res != i) {
wxLogMessage(wxString::Format(_T("Expected %i but got %i (%i)"),i,res,GetTimeAtFrame(i)));
fail++;
}
}
if (fail) wxLogMessage(wxString::Format(_T("Failed %i times"),fail));
else wxLogMessage(_T("VFR passes test"));
}*/
} catch (wchar_t *) {
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file.close();
Unload();
throw;
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}
// Close file
file.close();
loaded = true;
vfrFile = filename;
FrameRateType = VFR;
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}
//////////
// Unload
void FrameRate::Unload () {
FrameRateType = NONE;
AverageFrameRate = 0;
last_time = 0;
last_frame = 0;
Clear();
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loaded = false;
vfrFile = _T("");
}
///////////////
// Sets to CFR
void FrameRate::SetCFR(double fps) {
Unload();
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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 = 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) {
double value = double(ms)/1000.0 * AverageFrameRate;
if (useceil) return ceil(value);
else return floor(value);
}
// Get for variable frame rate
else if (FrameRateType == VFR) {
// Inside VFR range
if (ms < floor(last_time)) {
// 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 cur;
return cur-1;
}
// Not found, continue search
if (largerEqual) end = cur-1;
else start = cur+1;
}
}
// After VFR range
else {
return 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) {
return 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 < last_frame) return Frame.at(frame);
// Otherwise, calculate it
else return floor(last_time + double(frame-last_frame) / AverageFrameRate * 1000.0);
}
// Unknown frame rate type
return -1;
}
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/////////////////////////////
// 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) {
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return PFrameAtTime(ms,start);
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}
/////////////////////////////
// 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;
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}
///////////
// Globals
FrameRate VFR_Output;
FrameRate VFR_Input;