1 /*
2 * Copyright (C) 2015 The Android Open Source Project
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 express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 //#define LOG_NDEBUG 0
18 #define LOG_TAG "MediaClock"
19 #include <utils/Log.h>
20
21 #include <media/stagefright/MediaClock.h>
22
23 #include <media/stagefright/foundation/ADebug.h>
24 #include <media/stagefright/foundation/ALooper.h>
25
26 namespace android {
27
MediaClock()28 MediaClock::MediaClock()
29 : mAnchorTimeMediaUs(-1),
30 mAnchorTimeRealUs(-1),
31 mMaxTimeMediaUs(INT64_MAX),
32 mStartingTimeMediaUs(-1),
33 mPlaybackRate(1.0) {
34 }
35
~MediaClock()36 MediaClock::~MediaClock() {
37 }
38
setStartingTimeMedia(int64_t startingTimeMediaUs)39 void MediaClock::setStartingTimeMedia(int64_t startingTimeMediaUs) {
40 Mutex::Autolock autoLock(mLock);
41 mStartingTimeMediaUs = startingTimeMediaUs;
42 }
43
clearAnchor()44 void MediaClock::clearAnchor() {
45 Mutex::Autolock autoLock(mLock);
46 mAnchorTimeMediaUs = -1;
47 mAnchorTimeRealUs = -1;
48 }
49
updateAnchor(int64_t anchorTimeMediaUs,int64_t anchorTimeRealUs,int64_t maxTimeMediaUs)50 void MediaClock::updateAnchor(
51 int64_t anchorTimeMediaUs,
52 int64_t anchorTimeRealUs,
53 int64_t maxTimeMediaUs) {
54 if (anchorTimeMediaUs < 0 || anchorTimeRealUs < 0) {
55 ALOGW("reject anchor time since it is negative.");
56 return;
57 }
58
59 Mutex::Autolock autoLock(mLock);
60 int64_t nowUs = ALooper::GetNowUs();
61 int64_t nowMediaUs =
62 anchorTimeMediaUs + (nowUs - anchorTimeRealUs) * (double)mPlaybackRate;
63 if (nowMediaUs < 0) {
64 ALOGW("reject anchor time since it leads to negative media time.");
65 return;
66 }
67 mAnchorTimeRealUs = nowUs;
68 mAnchorTimeMediaUs = nowMediaUs;
69 mMaxTimeMediaUs = maxTimeMediaUs;
70 }
71
updateMaxTimeMedia(int64_t maxTimeMediaUs)72 void MediaClock::updateMaxTimeMedia(int64_t maxTimeMediaUs) {
73 Mutex::Autolock autoLock(mLock);
74 mMaxTimeMediaUs = maxTimeMediaUs;
75 }
76
setPlaybackRate(float rate)77 void MediaClock::setPlaybackRate(float rate) {
78 CHECK_GE(rate, 0.0);
79 Mutex::Autolock autoLock(mLock);
80 if (mAnchorTimeRealUs == -1) {
81 mPlaybackRate = rate;
82 return;
83 }
84
85 int64_t nowUs = ALooper::GetNowUs();
86 mAnchorTimeMediaUs += (nowUs - mAnchorTimeRealUs) * (double)mPlaybackRate;
87 if (mAnchorTimeMediaUs < 0) {
88 ALOGW("setRate: anchor time should not be negative, set to 0.");
89 mAnchorTimeMediaUs = 0;
90 }
91 mAnchorTimeRealUs = nowUs;
92 mPlaybackRate = rate;
93 }
94
getPlaybackRate() const95 float MediaClock::getPlaybackRate() const {
96 Mutex::Autolock autoLock(mLock);
97 return mPlaybackRate;
98 }
99
getMediaTime(int64_t realUs,int64_t * outMediaUs,bool allowPastMaxTime) const100 status_t MediaClock::getMediaTime(
101 int64_t realUs, int64_t *outMediaUs, bool allowPastMaxTime) const {
102 if (outMediaUs == NULL) {
103 return BAD_VALUE;
104 }
105
106 Mutex::Autolock autoLock(mLock);
107 return getMediaTime_l(realUs, outMediaUs, allowPastMaxTime);
108 }
109
getMediaTime_l(int64_t realUs,int64_t * outMediaUs,bool allowPastMaxTime) const110 status_t MediaClock::getMediaTime_l(
111 int64_t realUs, int64_t *outMediaUs, bool allowPastMaxTime) const {
112 if (mAnchorTimeRealUs == -1) {
113 return NO_INIT;
114 }
115
116 int64_t mediaUs = mAnchorTimeMediaUs
117 + (realUs - mAnchorTimeRealUs) * (double)mPlaybackRate;
118 if (mediaUs > mMaxTimeMediaUs && !allowPastMaxTime) {
119 mediaUs = mMaxTimeMediaUs;
120 }
121 if (mediaUs < mStartingTimeMediaUs) {
122 mediaUs = mStartingTimeMediaUs;
123 }
124 if (mediaUs < 0) {
125 mediaUs = 0;
126 }
127 *outMediaUs = mediaUs;
128 return OK;
129 }
130
getRealTimeFor(int64_t targetMediaUs,int64_t * outRealUs) const131 status_t MediaClock::getRealTimeFor(
132 int64_t targetMediaUs, int64_t *outRealUs) const {
133 if (outRealUs == NULL) {
134 return BAD_VALUE;
135 }
136
137 Mutex::Autolock autoLock(mLock);
138 if (mPlaybackRate == 0.0) {
139 return NO_INIT;
140 }
141
142 int64_t nowUs = ALooper::GetNowUs();
143 int64_t nowMediaUs;
144 status_t status =
145 getMediaTime_l(nowUs, &nowMediaUs, true /* allowPastMaxTime */);
146 if (status != OK) {
147 return status;
148 }
149 *outRealUs = (targetMediaUs - nowMediaUs) / (double)mPlaybackRate + nowUs;
150 return OK;
151 }
152
153 } // namespace android
154