blob: 9967bfeb9ea7071e6d4e81531a31ebfb0850e606 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
|
/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.mozilla.thirdparty.com.google.android.exoplayer2;
import androidx.annotation.Nullable;
import org.mozilla.thirdparty.com.google.android.exoplayer2.util.Clock;
import org.mozilla.thirdparty.com.google.android.exoplayer2.util.MediaClock;
import org.mozilla.thirdparty.com.google.android.exoplayer2.util.StandaloneMediaClock;
/**
* Default {@link MediaClock} which uses a renderer media clock and falls back to a
* {@link StandaloneMediaClock} if necessary.
*/
/* package */ final class DefaultMediaClock implements MediaClock {
/**
* Listener interface to be notified of changes to the active playback parameters.
*/
public interface PlaybackParameterListener {
/**
* Called when the active playback parameters changed. Will not be called for {@link
* #setPlaybackParameters(PlaybackParameters)}.
*
* @param newPlaybackParameters The newly active {@link PlaybackParameters}.
*/
void onPlaybackParametersChanged(PlaybackParameters newPlaybackParameters);
}
private final StandaloneMediaClock standaloneClock;
private final PlaybackParameterListener listener;
@Nullable private Renderer rendererClockSource;
@Nullable private MediaClock rendererClock;
private boolean isUsingStandaloneClock;
private boolean standaloneClockIsStarted;
/**
* Creates a new instance with listener for playback parameter changes and a {@link Clock} to use
* for the standalone clock implementation.
*
* @param listener A {@link PlaybackParameterListener} to listen for playback parameter
* changes.
* @param clock A {@link Clock}.
*/
public DefaultMediaClock(PlaybackParameterListener listener, Clock clock) {
this.listener = listener;
this.standaloneClock = new StandaloneMediaClock(clock);
isUsingStandaloneClock = true;
}
/**
* Starts the standalone fallback clock.
*/
public void start() {
standaloneClockIsStarted = true;
standaloneClock.start();
}
/**
* Stops the standalone fallback clock.
*/
public void stop() {
standaloneClockIsStarted = false;
standaloneClock.stop();
}
/**
* Resets the position of the standalone fallback clock.
*
* @param positionUs The position to set in microseconds.
*/
public void resetPosition(long positionUs) {
standaloneClock.resetPosition(positionUs);
}
/**
* Notifies the media clock that a renderer has been enabled. Starts using the media clock of the
* provided renderer if available.
*
* @param renderer The renderer which has been enabled.
* @throws ExoPlaybackException If the renderer provides a media clock and another renderer media
* clock is already provided.
*/
public void onRendererEnabled(Renderer renderer) throws ExoPlaybackException {
MediaClock rendererMediaClock = renderer.getMediaClock();
if (rendererMediaClock != null && rendererMediaClock != rendererClock) {
if (rendererClock != null) {
throw ExoPlaybackException.createForUnexpected(
new IllegalStateException("Multiple renderer media clocks enabled."));
}
this.rendererClock = rendererMediaClock;
this.rendererClockSource = renderer;
rendererClock.setPlaybackParameters(standaloneClock.getPlaybackParameters());
}
}
/**
* Notifies the media clock that a renderer has been disabled. Stops using the media clock of this
* renderer if used.
*
* @param renderer The renderer which has been disabled.
*/
public void onRendererDisabled(Renderer renderer) {
if (renderer == rendererClockSource) {
this.rendererClock = null;
this.rendererClockSource = null;
isUsingStandaloneClock = true;
}
}
/**
* Syncs internal clock if needed and returns current clock position in microseconds.
*
* @param isReadingAhead Whether the renderers are reading ahead.
*/
public long syncAndGetPositionUs(boolean isReadingAhead) {
syncClocks(isReadingAhead);
return getPositionUs();
}
// MediaClock implementation.
@Override
public long getPositionUs() {
return isUsingStandaloneClock ? standaloneClock.getPositionUs() : rendererClock.getPositionUs();
}
@Override
public void setPlaybackParameters(PlaybackParameters playbackParameters) {
if (rendererClock != null) {
rendererClock.setPlaybackParameters(playbackParameters);
playbackParameters = rendererClock.getPlaybackParameters();
}
standaloneClock.setPlaybackParameters(playbackParameters);
}
@Override
public PlaybackParameters getPlaybackParameters() {
return rendererClock != null
? rendererClock.getPlaybackParameters()
: standaloneClock.getPlaybackParameters();
}
private void syncClocks(boolean isReadingAhead) {
if (shouldUseStandaloneClock(isReadingAhead)) {
isUsingStandaloneClock = true;
if (standaloneClockIsStarted) {
standaloneClock.start();
}
return;
}
long rendererClockPositionUs = rendererClock.getPositionUs();
if (isUsingStandaloneClock) {
// Ensure enabling the renderer clock doesn't jump backwards in time.
if (rendererClockPositionUs < standaloneClock.getPositionUs()) {
standaloneClock.stop();
return;
}
isUsingStandaloneClock = false;
if (standaloneClockIsStarted) {
standaloneClock.start();
}
}
// Continuously sync stand-alone clock to renderer clock so that it can take over if needed.
standaloneClock.resetPosition(rendererClockPositionUs);
PlaybackParameters playbackParameters = rendererClock.getPlaybackParameters();
if (!playbackParameters.equals(standaloneClock.getPlaybackParameters())) {
standaloneClock.setPlaybackParameters(playbackParameters);
listener.onPlaybackParametersChanged(playbackParameters);
}
}
private boolean shouldUseStandaloneClock(boolean isReadingAhead) {
// Use the standalone clock if the clock providing renderer is not set or has ended. Also use
// the standalone clock if the renderer is not ready and we have finished reading the stream or
// are reading ahead to avoid getting stuck if tracks in the current period have uneven
// durations. See: https://github.com/google/ExoPlayer/issues/1874.
return rendererClockSource == null
|| rendererClockSource.isEnded()
|| (!rendererClockSource.isReady()
&& (isReadingAhead || rendererClockSource.hasReadStreamToEnd()));
}
}
|
