1/*
2Copyright (c) 2012, Broadcom Europe Ltd
3All rights reserved.
4
5Redistribution and use in source and binary forms, with or without
6modification, are permitted provided that the following conditions are met:
7 * Redistributions of source code must retain the above copyright
8 notice, this list of conditions and the following disclaimer.
9 * Redistributions in binary form must reproduce the above copyright
10 notice, this list of conditions and the following disclaimer in the
11 documentation and/or other materials provided with the distribution.
12 * Neither the name of the copyright holder nor the
13 names of its contributors may be used to endorse or promote products
14 derived from this software without specific prior written permission.
15
16THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
17ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY
20DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
21(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
23ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
25SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26*/
27#ifndef VC_CONTAINERS_TIME_H
28#define VC_CONTAINERS_TIME_H
29
30/** \file
31 * Utility functions to help with timestamping of elementary stream frames
32 */
33
34typedef struct VC_CONTAINER_TIME_T
35{
36 uint32_t samplerate_num;
37 uint32_t samplerate_den;
38 uint32_t time_base;
39
40 uint32_t remainder;
41
42 int64_t time;
43
44} VC_CONTAINER_TIME_T;
45
46/*****************************************************************************/
47STATIC_INLINE void vc_container_time_init( VC_CONTAINER_TIME_T *time, uint32_t time_base )
48{
49 time->samplerate_num = 0;
50 time->samplerate_den = 0;
51 time->remainder = 0;
52 time->time_base = time_base;
53 time->time = VC_CONTAINER_TIME_UNKNOWN;
54}
55
56/*****************************************************************************/
57STATIC_INLINE int64_t vc_container_time_get( VC_CONTAINER_TIME_T *time )
58{
59 if (time->time == VC_CONTAINER_TIME_UNKNOWN || !time->samplerate_num || !time->samplerate_den)
60 return VC_CONTAINER_TIME_UNKNOWN;
61 return time->time + time->remainder * (int64_t)time->time_base * time->samplerate_den / time->samplerate_num;
62}
63
64/*****************************************************************************/
65STATIC_INLINE void vc_container_time_set_samplerate( VC_CONTAINER_TIME_T *time, uint32_t samplerate_num, uint32_t samplerate_den )
66{
67 if(time->samplerate_num == samplerate_num &&
68 time->samplerate_den == samplerate_den)
69 return;
70
71 /* We're changing samplerate, we need to reset our remainder */
72 if(time->remainder)
73 time->time = vc_container_time_get( time );
74 time->remainder = 0;
75 time->samplerate_num = samplerate_num;
76 time->samplerate_den = samplerate_den;
77}
78
79/*****************************************************************************/
80STATIC_INLINE void vc_container_time_set( VC_CONTAINER_TIME_T *time, int64_t new_time )
81{
82 if (new_time == VC_CONTAINER_TIME_UNKNOWN)
83 return;
84 time->remainder = 0;
85 time->time = new_time;
86}
87
88/*****************************************************************************/
89STATIC_INLINE int64_t vc_container_time_add( VC_CONTAINER_TIME_T *time, uint32_t samples )
90{
91 uint32_t increment;
92
93 if (time->time == VC_CONTAINER_TIME_UNKNOWN || !time->samplerate_num || !time->samplerate_den)
94 return VC_CONTAINER_TIME_UNKNOWN;
95
96 samples += time->remainder;
97 increment = samples * time->samplerate_den / time->samplerate_num;
98 time->time += increment * time->time_base;
99 time->remainder = samples - increment * time->samplerate_num / time->samplerate_den;
100 return vc_container_time_get(time);
101}
102
103#endif /* VC_CONTAINERS_TIME_H */
104