1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
|
/*
* VFR translation functions for OverLua
*
* $Id$
*
* (C) 2003-2006 Gabest
* (C) 2006-2010 see AUTHORS
*
* This file is part of mplayerc.
*
* Mplayerc 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.
*
* Mplayerc 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/>.
*
*/
#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 § = 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(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, 50, 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(vfrfile, "r");
VFRTranslator *res = 0;
if (fgets(buf, 32, f) && buf[0] == '#') {
// So do some really shoddy parsing here, assume the file is good
if (buf[19] == '1') {
res = new TimecodesV1(f);
} else if (buf[19] == '2') {
res = new TimecodesV2(f);
}
}
fclose(f);
return res;
}
|
