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timestamp.h
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1 /*
2  * This file is part of FFmpeg.
3  *
4  * FFmpeg is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * FFmpeg is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with FFmpeg; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 /**
20  * @file
21  * timestamp utils, mostly useful for debugging/logging purposes
22  */
23 
24 #ifndef AVUTIL_TIMESTAMP_H
25 #define AVUTIL_TIMESTAMP_H
26 
27 #include "common.h"
28 
29 #define AV_TS_MAX_STRING_SIZE 32
30 
31 /**
32  * Fill the provided buffer with a string containing a timestamp
33  * representation.
34  *
35  * @param buf a buffer with size in bytes of at least AV_TS_MAX_STRING_SIZE
36  * @param ts the timestamp to represent
37  * @return the buffer in input
38  */
39 static inline char *av_ts_make_string(char *buf, int64_t ts)
40 {
41  if (ts == AV_NOPTS_VALUE) snprintf(buf, AV_TS_MAX_STRING_SIZE, "NOPTS");
42  else snprintf(buf, AV_TS_MAX_STRING_SIZE, "%"PRId64"", ts);
43  return buf;
44 }
45 
46 /**
47  * Convenience macro, the return value should be used only directly in
48  * function arguments but never stand-alone.
49  */
50 #define av_ts2str(ts) av_ts_make_string((char[AV_TS_MAX_STRING_SIZE]){0}, ts)
51 
52 /**
53  * Fill the provided buffer with a string containing a timestamp time
54  * representation.
55  *
56  * @param buf a buffer with size in bytes of at least AV_TS_MAX_STRING_SIZE
57  * @param ts the timestamp to represent
58  * @param tb the timebase of the timestamp
59  * @return the buffer in input
60  */
61 static inline char *av_ts_make_time_string(char *buf, int64_t ts, AVRational *tb)
62 {
63  if (ts == AV_NOPTS_VALUE) snprintf(buf, AV_TS_MAX_STRING_SIZE, "NOPTS");
64  else snprintf(buf, AV_TS_MAX_STRING_SIZE, "%.6g", av_q2d(*tb) * ts);
65  return buf;
66 }
67 
68 /**
69  * Convenience macro, the return value should be used only directly in
70  * function arguments but never stand-alone.
71  */
72 #define av_ts2timestr(ts, tb) av_ts_make_time_string((char[AV_TS_MAX_STRING_SIZE]){0}, ts, tb)
73 
74 #endif /* AVUTIL_TIMESTAMP_H */