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Pass the Clock interface into the constructor

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This commit is contained in:
sneelavara 2020-04-09 18:45:44 -07:00 committed by Ian Baker
parent 0ef38fcd1a
commit f4f13d9132
2 changed files with 20 additions and 11 deletions
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4
library/core/src/main/java/com/google/android/exoplayer2/text/SubtitleDecoderFactory.java
View File

@ -27,6 +27,7 @@ import com.google.android.exoplayer2.text.ttml.TtmlDecoder;
import com.google.android.exoplayer2.text.tx3g.Tx3gDecoder;
import com.google.android.exoplayer2.text.webvtt.Mp4WebvttDecoder;
import com.google.android.exoplayer2.text.webvtt.WebvttDecoder;
import com.google.android.exoplayer2.util.Clock;
import com.google.android.exoplayer2.util.MimeTypes;
/**
@ -108,7 +109,8 @@ public interface SubtitleDecoderFactory {
return new Tx3gDecoder(format.initializationData);
case MimeTypes.APPLICATION_CEA608:
case MimeTypes.APPLICATION_MP4CEA608:
return new Cea608Decoder(mimeType, format.accessibilityChannel);
return new Cea608Decoder(mimeType, format.accessibilityChannel
16000L, Clock.DEFAULT);
case MimeTypes.APPLICATION_CEA708:
return new Cea708Decoder(format.accessibilityChannel, format.initializationData);
case MimeTypes.APPLICATION_DVBSUBS:

27
library/core/src/main/java/com/google/android/exoplayer2/text/cea/Cea608Decoder.java
View File

@ -31,6 +31,7 @@ import com.google.android.exoplayer2.text.Subtitle;
import com.google.android.exoplayer2.text.SubtitleDecoder;
import com.google.android.exoplayer2.text.SubtitleInputBuffer;
import com.google.android.exoplayer2.util.Assertions;
import com.google.android.exoplayer2.util.Clock;
import com.google.android.exoplayer2.util.Log;
import com.google.android.exoplayer2.util.MimeTypes;
import com.google.android.exoplayer2.util.ParsableByteArray;
@ -260,18 +261,23 @@ public final class Cea608Decoder extends CeaDecoder {
// Static counter to keep track of last CC rendered. This is used to force erase the caption when
// the stream does not explicitly send control codes to remove caption as specified by
// CEA-608 Annex C.9
private long ccTimeOutCounter = C.TIME_UNSET;
private long lastCueUpdateMs = C.TIME_UNSET;
private boolean captionEraseCommandSeen = false;
// CEA-608 Annex C.9 propose that if no data are received for the selected caption channel within
// a given time, the decoder should automatically erase the caption. The time limit should be no
// less than 16 seconds
public static final int VALID_DATA_CHANNEL_TIMEOUT_MS = 16000;
public Cea608Decoder(String mimeType, int accessibilityChannel) {
// This value is set in the constructor. The automatic erasure is disabled when this value is 0
private long validDataChannelTimeoutMs = 0;
private Clock clock;
public Cea608Decoder(String mimeType, int accessibilityChannel, long timeoutMs, Clock clock) {
ccData = new ParsableByteArray();
cueBuilders = new ArrayList<>();
currentCueBuilder = new CueBuilder(CC_MODE_UNKNOWN, DEFAULT_CAPTIONS_ROW_COUNT);
currentChannel = NTSC_CC_CHANNEL_1;
validDataChannelTimeoutMs = timeoutMs;
this.clock = clock;
packetLength = MimeTypes.APPLICATION_MP4CEA608.equals(mimeType) ? 2 : 3;
switch (accessibilityChannel) {
case 1:
@ -320,7 +326,7 @@ public final class Cea608Decoder extends CeaDecoder {
repeatableControlCc2 = 0;
currentChannel = NTSC_CC_CHANNEL_1;
isInCaptionService = true;
ccTimeOutCounter = C.TIME_UNSET;
lastCueUpdateMs = C.TIME_UNSET;
}
@Override
@ -433,8 +439,8 @@ public final class Cea608Decoder extends CeaDecoder {
if (captionDataProcessed) {
if (captionMode == CC_MODE_ROLL_UP || captionMode == CC_MODE_PAINT_ON) {
cues = getDisplayCues();
if (!captionEraseCommandSeen) {
ccTimeOutCounter = System.currentTimeMillis();
if ((validDataChannelTimeoutMs != 0) && !captionEraseCommandSeen) {
lastCueUpdateMs = clock.elapsedRealtime();
}
}
}
@ -1036,13 +1042,14 @@ public final class Cea608Decoder extends CeaDecoder {
protected void clearStuckCaptions()
{
if (ccTimeOutCounter != C.TIME_UNSET) {
long timeElapsed = System.currentTimeMillis() - ccTimeOutCounter;
if (timeElapsed >= VALID_DATA_CHANNEL_TIMEOUT_MS) {
if ((validDataChannelTimeoutMs != 0) &&
(lastCueUpdateMs != C.TIME_UNSET)) {
long timeElapsed = clock.elapsedRealtime() - lastCueUpdateMs;
if (timeElapsed >= validDataChannelTimeoutMs) {
// Force erase captions. There might be stale captions stuck on screen.
// (CEA-608 Annex C.9)
cues = Collections.emptyList();
ccTimeOutCounter = C.TIME_UNSET;
lastCueUpdateMs = C.TIME_UNSET;
}
}
}