1 /* ------------------------------------------------------------------
2 * Copyright (C) 1998-2009 PacketVideo
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
13 * express or implied.
14 * See the License for the specific language governing permissions
15 * and limitations under the License.
16 * -------------------------------------------------------------------
17 */
18 #include "media_clock_converter.h"
19
20 // Use default DLL entry point for Symbian
21 #include "oscl_dll.h"
OSCL_DLL_ENTRY_POINT_DEFAULT()22 OSCL_DLL_ENTRY_POINT_DEFAULT()
23
24 // All the rounding in this utility is using method rounding up
25 // For example, normal calculation
26 // A / B
27 // is replaced as
28 // (A + (B - 1))/ B
29 // In an average roudning up is same as rounding down, but it resolve some issue
30
31 //////////////////////////////////////////////////////////////////////////////////
32 OSCL_EXPORT_REF void MediaClockConverter::set_value(const MediaClockConverter& src)
33 {
34 // Timescale value cannot be zero
35 OSCL_ASSERT(src.get_timescale() != 0);
36 if (src.get_timescale() == 0)
37 {
38 OSCL_LEAVE(OsclErrCorrupt);
39 }
40
41 OSCL_ASSERT(timescale != 0);
42 if (0 == timescale)
43 {
44 OSCL_LEAVE(OsclErrCorrupt);
45 }
46
47 uint64 value = (uint64(src.get_wrap_count())) << 32;
48
49 value += src.get_current_timestamp();
50
51 // rounding up
52 value = (uint64(value) * timescale + uint64(src.get_timescale() - 1)) / src.get_timescale();
53
54 wrap_count = ((uint32)(value >> 32)) % timescale;
55
56 current_ts = (uint32)(value & 0xFFFFFFFF);
57 }
58
59 //////////////////////////////////////////////////////////////////////////////////
set_timescale(uint32 new_timescale)60 OSCL_EXPORT_REF void MediaClockConverter::set_timescale(uint32 new_timescale)
61 {
62 // Timescale value cannot be zero
63 OSCL_ASSERT(new_timescale != 0);
64 if (0 == new_timescale)
65 {
66 OSCL_LEAVE(OsclErrArgument);
67 }
68
69 OSCL_ASSERT(timescale != 0);
70 if (0 == timescale)
71 {
72 OSCL_LEAVE(OsclErrCorrupt);
73 }
74
75 uint64 value = ((uint64)wrap_count) << 32;
76 value += current_ts;
77
78 // rounding up
79 value = (value * new_timescale + uint64(timescale - 1)) / timescale;
80
81 timescale = new_timescale;
82
83 wrap_count = ((uint32)(value >> 32)) % timescale;
84
85 current_ts = (uint32)(value & 0xFFFFFFFF);
86 }
87
88 //////////////////////////////////////////////////////////////////////////////////
set_clock_other_timescale(uint32 value,uint32 in_timescale)89 OSCL_EXPORT_REF void MediaClockConverter::set_clock_other_timescale(uint32 value,
90 uint32 in_timescale)
91 {
92 // Timescale value cannot be zero
93 OSCL_ASSERT(in_timescale != 0);
94 if (0 == in_timescale)
95 {
96 OSCL_LEAVE(OsclErrArgument);
97 }
98
99 OSCL_ASSERT(timescale != 0);
100 if (0 == timescale)
101 {
102 OSCL_LEAVE(OsclErrCorrupt);
103 }
104
105 uint64 new_value = (uint64)value * timescale;
106 uint64 in_timescale64Comp = (uint64)(in_timescale - 1);
107
108 // rounding up
109 new_value = new_value + in_timescale64Comp ;
110 new_value /= in_timescale;
111
112 wrap_count = ((uint32)(new_value >> 32)) % timescale;
113
114 current_ts = (uint32)(new_value & 0xFFFFFFFF);
115 }
116
117 //////////////////////////////////////////////////////////////////////////////////
get_timediff_and_update_clock(uint32 value,uint32 in_timescale,uint32 output_timescale)118 OSCL_EXPORT_REF uint32 MediaClockConverter::get_timediff_and_update_clock(uint32 value,
119 uint32 in_timescale,
120 uint32 output_timescale)
121 {
122 // Timescale value cannot be zero
123 OSCL_ASSERT(in_timescale != 0);
124 if (0 == in_timescale)
125 {
126 OSCL_LEAVE(OsclErrArgument);
127 }
128
129 // convert to native timescale
130 // rounding up
131 uint64 new_value = (uint64)value * timescale + uint64(in_timescale - 1);
132 new_value /= in_timescale;
133
134 uint32 new_timevalue = ((uint32)(new_value & 0xFFFFFFFF));
135
136 return get_timediff_and_update_clock(new_timevalue, output_timescale);
137
138 }
139
140 //////////////////////////////////////////////////////////////////////////////////
get_timediff_and_update_clock(uint32 value,uint32 output_timescale)141 OSCL_EXPORT_REF uint32 MediaClockConverter::get_timediff_and_update_clock(uint32 value,
142 uint32 output_timescale)
143 {
144 // Timescale value cannot be zero
145 OSCL_ASSERT(timescale != 0);
146 if (0 == timescale)
147 {
148 OSCL_LEAVE(OsclErrCorrupt);
149 }
150
151 uint32 diff = value - current_ts;
152
153 // convert to output timescale
154 // rounding up
155 uint64 new_value = (uint64)diff * output_timescale + uint64(timescale - 1);
156 new_value /= timescale;
157
158 diff = ((uint32)(new_value & 0xFFFFFFFF));
159
160 if (update_clock(value))
161 {
162 return diff;
163 }
164
165 return 0;
166 }
167
168
169 //////////////////////////////////////////////////////////////////////////////////
update_clock(uint32 new_ts)170 OSCL_EXPORT_REF bool MediaClockConverter::update_clock(uint32 new_ts)
171 {
172 uint32 diff = new_ts - current_ts;
173 if (new_ts < current_ts)
174 {
175 if (diff < WRAP_THRESHOLD)
176 {
177 if (++wrap_count >= timescale)
178 {
179 wrap_count = 0;
180 }
181 current_ts = new_ts;
182 return true;
183 }
184 // otherwise this an earlier value so ignore it.
185 }
186 else
187 {
188 if (diff < MISORDER_THRESHOLD)
189 {
190 current_ts = new_ts;
191 return true;
192 }
193 // otherwise this an earlier value so ignore it.
194 }
195 return false;
196 }
197
198 //////////////////////////////////////////////////////////////////////////////////
get_converted_ts(uint32 new_timescale) const199 OSCL_EXPORT_REF uint32 MediaClockConverter::get_converted_ts(uint32 new_timescale) const
200 {
201 // Timescale value cannot be zero
202 OSCL_ASSERT(timescale != 0);
203 if (0 == timescale)
204 {
205 OSCL_LEAVE(OsclErrCorrupt);
206 }
207
208 uint64 value = ((uint64)wrap_count) << 32;
209 // rounding up
210 value = ((value + uint64(current_ts)) * uint64(new_timescale) + uint64(timescale - 1)) / uint64(timescale);
211
212 return ((uint32) value);
213
214 }
215