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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double last = 0.0;
int frames = 0;
for (std::vector<int>::iterator cur=Frame.begin();cur!=Frame.end();cur++) {
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last = *cur;
frames++;
}
AverageFrameRate = double(frames)*1000.0/last;
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}
//////////////////////// FrameRate //////////////////////
///////////////
// Constructor
FrameRate::FrameRate() {
Unload();
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}
//////////////
// Destructor
FrameRate::~FrameRate() {
Clear();
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}
/////////////////////////////
// Gets frame number at time
int FrameRate::GetFrameAtTime(int ms) {
if (!loaded) return -1;
ms = MAX(ms,0); //fix me, unsafe for CorrectFrame... for frame 0?
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if (FrameRateType == CFR) {
return floor((double(ms)/1000.0) * AverageFrameRate);
}
else if (FrameRateType == VFR) {
if (ms < floor(last_time)) {
// Binary search
size_t start = 0;
size_t end = last_frame;
size_t cur;
bool largerEqual;
while (start <= end) {
cur = (start+end)>>1;
largerEqual = Frame[cur] >= ms;
// Found
if (largerEqual && (cur == 0 || Frame[cur-1] < ms))
return cur;
// Not found
if (largerEqual) end = cur-1;
else start = cur+1;
}
} else if (assumefps != 0) {
return last_frame + floor((ms-last_time) * assumefps / 1000);
}
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}
return -1;
}
//////////////////////
// Gets time at frame
int FrameRate::GetTimeAtFrame(int frame) {
if (!loaded) return -1;
wxASSERT(frame >= 0);
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if (FrameRateType == CFR) {
return floor(double(frame) / AverageFrameRate * 1000);
} else if (FrameRateType == VFR) {
if (frame < last_frame)
return Frame.at(frame);
else if (assumefps != 0)
return floor(last_time + (frame-last_frame+1) / assumefps * 1000);
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}
return -1;
}
//////////////////
// Loads VFR file
void FrameRate::Load(wxString filename) {
using namespace std;
// 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.");
//fix me, will b0rk if loading the file fails
Unload();
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// 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()) {
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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 {
curLine.Mid(6).ToDouble(&assumefps);
break;
}
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}
//read and expand all timecodes to v2
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wxString curline;
double currenttime = 0;
int lposition = -1;
long lstart;
long lend;
double lfps;
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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(','));
temp.ToLong(&lstart);
temp = tmp.BeforeLast(_T(','));
temp.ToLong(&lend);
temp = tmp.AfterLast(_T(','));
temp.ToDouble(&lfps);
for (int i = 0; i <= lstart - lposition - 2; i++)
AddFrame(floor(currenttime+(i*1000) / assumefps));
currenttime += ((lstart - lposition - 1)*1000) / assumefps;
for (int i = 0; i <= lend - lstart; i++)
AddFrame(floor(currenttime+(i*1000) / lfps));
currenttime += ((lend - lstart + 1)*1000) / lfps;
lposition = lend;
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}
last_time = currenttime;
last_frame = Frame.size();
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}
// V2
else if (header == _T("# timecode format v2")) {
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// Assigns new VFR file
FrameRateType = VFR;
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);
wxASSERT(lftime < cftime);
AddFrame(cftime);
lftime = cftime;
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}
last_time = cftime;
last_frame = Frame.size();
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}
// Unknown
else {
file.close();
Unload();
throw _T("Unknown file format.");
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}
// Run test
bool doTest = false;
if (doTest) {
int fail = 0;
int res;
for (int i=0;i<1000;i++) {
res = GetFrameAtTime(GetTimeAtFrame(i));
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if (res != i) {
wxLogMessage(wxString::Format(_T("Expected %i but got %i (%i)"),i,res,GetTimeAtFrame(i)));
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fail++;
}
}
if (fail) wxLogMessage(wxString::Format(_T("Failed %i times"),fail));
else wxLogMessage(_T("VFR passes test"));
}
// Close file
file.close();
loaded = true;
vfrFile = filename;
FrameRateType = VFR;
CalcAverage();
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}
//////////
// Unload
void FrameRate::Unload () {
FrameRateType = NONE;
AverageFrameRate = 0;
assumefps = 0;
last_time = 0;
last_frame = 0;
Clear();
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loaded = false;
vfrFile = _T("");
}
///////////////
// Sets to CFR
void FrameRate::SetCFR(double fps,bool ifunset) {
if (loaded && ifunset) return;
Unload();
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loaded = true;
vfrFile = _T("");
FrameRateType = CFR;
AverageFrameRate = fps;
}
///////////////
// Sets to VFR
void FrameRate::SetVFR(std::vector<int> newTimes) {
// Prepare
Unload();
loaded = true;
vfrFile = _T("");
FrameRateType = VFR;
// Set new VFR
AverageFrameRate = newTimes.back() / (newTimes.size()-1);
Frame = newTimes;
last_time = newTimes.back();
last_frame = newTimes.size()-1;
}
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/////////////////////////////
// Get correct frame at time
// returns the adjusted time for end frames when start=false
// otherwise for start frames
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int FrameRate::CorrectFrameAtTime(int ms,bool start) {
int frame;
// CFR
if (FrameRateType == CFR) {
int delta = 0;
if (start) delta = 1;
frame = GetFrameAtTime(ms-delta)+delta;
int time = GetTimeAtFrame(frame);
if (start && time < ms) frame++;
if (!start && time > ms) frame--;
}
// VFR
else {
frame = GetFrameAtTime(ms);
if (!start) frame--;
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}
return frame;
}
/////////////////////////////
// Get correct time at frame
// compensates and returns an end time when start=false
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int FrameRate::CorrectTimeAtFrame(int frame,bool start) {
if (start)
return GetTimeAtFrame(frame);
else
return GetTimeAtFrame(frame+1);
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}
///////////
// Globals
FrameRate VFR_Output;
FrameRate VFR_Input;