FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
timecode.h
Go to the documentation of this file.
1 /*
2  * Copyright (C) 2006 Smartjog S.A.S, Baptiste Coudurier <baptiste.coudurier@gmail.com>
3  * Copyright (C) 2011 Smartjog S.A.S, Clément Bœsch <clement.boesch@smartjog.com>
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * Timecode helpers header
25  * This *private* API is deprecated, please use the one available in libavutil instead.
26  */
27 
28 #ifndef AVCODEC_TIMECODE_H
29 #define AVCODEC_TIMECODE_H
30 
31 #include "version.h"
32 
33 #if FF_API_OLD_TIMECODE
34 
35 #include <stdint.h>
36 #include "avcodec.h"
37 #include "libavutil/rational.h"
38 
39 #define TIMECODE_OPT(ctx, flags) \
40  "timecode", "set timecode value following hh:mm:ss[:;.]ff format, " \
41  "use ';' or '.' before frame number for drop frame", \
42  offsetof(ctx, tc.str), \
43  AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, flags
44 
45 struct ff_timecode {
46  char *str; ///< string following the hh:mm:ss[:;.]ff format
47  int start; ///< timecode frame start
48  int drop; ///< drop flag (1 if drop, else 0)
49  AVRational rate; ///< Frame rate in rational form
50 };
51 
52 /**
53  * @brief Adjust frame number for NTSC drop frame time code
54  * @param frame_num Actual frame number to adjust
55  * @return Adjusted frame number
56  * @warning Adjustment is only valid in NTSC 29.97
57  */
58 int avpriv_framenum_to_drop_timecode(int frame_num);
59 
60 /**
61  * @brief Convert frame id (timecode) to SMPTE 12M binary representation
62  * @param frame Frame number
63  * @param fps Frame rate
64  * @param drop Drop flag
65  * @return The actual binary representation
66  */
67 uint32_t avpriv_framenum_to_smpte_timecode(unsigned frame, int fps, int drop);
68 
69 /**
70  * @brief Load timecode string in buf
71  * @param buf Destination buffer
72  * @param tc Timecode struct pointer
73  * @param frame Frame id (timecode frame is computed with tc->start+frame)
74  * @return a pointer to the buf parameter
75  * @note timecode representation can be a negative timecode and have
76  * more than 24 hours.
77  * @note buf must have enough space to store the timecode representation: 16
78  * bytes is the minimum required size.
79  */
80 char *avpriv_timecode_to_string(char *buf, const struct ff_timecode *tc, unsigned frame);
81 
82 /**
83  * Check if timecode rate is valid and consistent with the drop flag.
84  *
85  * @return 0 on success, negative value on failure
86  */
87 int avpriv_check_timecode_rate(void *avcl, AVRational rate, int drop);
88 
89 /**
90  * Parse SMTPE 12M time representation (hh:mm:ss[:;.]ff). str and rate fields
91  * from tc struct must be set.
92  *
93  * @param avcl A pointer to an arbitrary struct of which the first field is a
94  * pointer to an AVClass struct (used for av_log).
95  * @param tc Timecode struct pointer
96  * @return 0 on success, negative value on failure
97  * @warning Adjustement is only valid in NTSC 29.97
98  */
99 int avpriv_init_smpte_timecode(void *avcl, struct ff_timecode *tc);
100 
101 attribute_deprecated int ff_framenum_to_drop_timecode(int frame_num);
102 attribute_deprecated uint32_t ff_framenum_to_smtpe_timecode(unsigned frame, int fps, int drop);
103 attribute_deprecated int ff_init_smtpe_timecode(void *avcl, struct ff_timecode *tc);
104 #endif
105 
106 #endif /* AVCODEC_TIMECODE_H */