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/*
* (C) 2003-2006 Gabest
* (C) 2006-2013 see Authors.txt
*
* This file is part of MPC-HC.
*
* MPC-HC is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* MPC-HC 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
// VFR translation functions for OverLua
#include "stdafx.h"
#include "vfr.h"
#include <stdio.h>
#include <string.h>
#include <vector>
// Work with seconds per frame (spf) here instead of fps since that's more natural for the translation we're doing
class TimecodesV1 : public VFRTranslator
{
private:
// Used when sections run out
double default_spf;
double first_non_section_timestamp;
int first_non_section_frame;
// Also generate sections for unspecified ones
// (use the default framerate then)
struct FrameRateSection {
double start_time;
double spf;
int start_frame;
int end_frame;
};
std::vector<FrameRateSection> sections;
public:
virtual double TimeStampFromFrameNumber(int n) {
// Find correct section
for (size_t i = 0; i < sections.size(); i++) {
FrameRateSection& sect = sections[i];
if (n >= sect.start_frame && n <= sect.end_frame) {
return sect.start_time + (n - sect.start_frame) * sect.spf;
}
}
// Not in a section
if (n < 0) {
return 0.0;
}
return first_non_section_timestamp + (n - first_non_section_frame) * default_spf;
}
TimecodesV1(FILE* vfrfile) {
char buf[100];
default_spf = -1;
double cur_time = 0.0;
FrameRateSection temp_section;
temp_section.start_time = 0.0;
temp_section.spf = -1;
temp_section.start_frame = 0;
temp_section.end_frame = 0;
while (fgets(buf, 100, vfrfile)) {
// Comment?
if (buf[0] == '#') {
continue;
}
if (_strnicmp(buf, "Assume ", 7) == 0 && default_spf < 0) {
char* num = buf + 7;
default_spf = atof(num);
if (default_spf > 0) {
default_spf = 1 / default_spf;
} else {
default_spf = -1;
}
temp_section.spf = default_spf;
continue;
}
int start_frame, end_frame;
float fps;
if (sscanf_s(buf, "%d,%d,%f", &start_frame, &end_frame, &fps) == 3) {
// Finish the current temp section
temp_section.end_frame = start_frame - 1;
if (temp_section.end_frame >= temp_section.start_frame) {
cur_time += (temp_section.end_frame - temp_section.start_frame + 1) * temp_section.spf;
sections.push_back(temp_section);
}
// Insert the section corresponding to this line
temp_section.spf = 1 / fps;
temp_section.start_frame = start_frame;
temp_section.end_frame = end_frame;
temp_section.start_time = cur_time;
cur_time += (end_frame - start_frame + 1) / fps;
sections.push_back(temp_section);
// Begin new temp section
temp_section.spf = default_spf;
temp_section.start_frame = end_frame + 1;
temp_section.end_frame = end_frame; // yes, negative duration
temp_section.start_time = cur_time;
}
}
first_non_section_timestamp = cur_time;
first_non_section_frame = temp_section.start_frame;
}
};
class TimecodesV2 : public VFRTranslator
{
private:
// Main data
std::vector<double> timestamps;
// For when data are exhausted (well, they shouldn't, then the vfr file is bad)
int last_known_frame;
double last_known_timestamp;
double assumed_spf;
public:
virtual double TimeStampFromFrameNumber(int n) {
if (n < (int)timestamps.size() && n >= 0) {
return timestamps[n];
}
if (n < 0) {
return 0.0;
}
return last_known_timestamp + (n - last_known_frame) * assumed_spf;
}
TimecodesV2(FILE* vfrfile) {
char buf[50];
timestamps.reserve(8192); // should be enough for most cases
while (fgets(buf, _countof(buf), vfrfile)) {
// Comment?
if (buf[0] == '#') {
continue;
}
// Otherwise assume it's a good timestamp
timestamps.push_back(atof(buf) / 1000);
}
last_known_frame = (int)timestamps.size() - 1;
last_known_timestamp = timestamps[last_known_frame];
assumed_spf = last_known_timestamp - timestamps[last_known_frame - 1];
}
};
VFRTranslator* GetVFRTranslator(const char* vfrfile)
{
char buf[32];
buf[19] = 0; // In "# timecode format v1" the version number is character index 19
FILE* f;
fopen_s(&f, vfrfile, "r"); // errno_t err = <-- TODO: Check if fopen_s fails
VFRTranslator* res = 0;
if (fgets(buf, _countof(buf), f) && buf[0] == '#') {
// So do some really shoddy parsing here, assume the file is good
if (buf[19] == '1') {
res = DEBUG_NEW TimecodesV1(f);
} else if (buf[19] == '2') {
res = DEBUG_NEW TimecodesV2(f);
}
}
fclose(f);
return res;
}
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