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Fix handling of PTS wraparound.

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This commit is contained in:
Oliver Woodman 2015-01-27 15:12:33 +00:00
parent ee83468084
commit b7be7bc01b
1 changed files with 34 additions and 14 deletions
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48
library/src/main/java/com/google/android/exoplayer/hls/TsExtractor.java
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@ -53,19 +53,21 @@ public final class TsExtractor {
private static final int TS_STREAM_TYPE_ID3 = 0x15;
private static final int TS_STREAM_TYPE_EIA608 = 0x100; // 0xFF + 1
private static final long MAX_PTS = 0x1FFFFFFFFL;
private final BitArray tsPacketBuffer;
private final SparseArray<SampleQueue> sampleQueues; // Indexed by streamType
private final SparseArray<TsPayloadReader> tsPayloadReaders; // Indexed by pid
private final SamplePool samplePool;
private final boolean shouldSpliceIn;
/* package */ final long firstSampleTimestamp;
private final long firstSampleTimestamp;
// Accessed only by the consuming thread.
private boolean spliceConfigured;
// Accessed only by the loading thread.
/* package */ boolean pendingFirstSampleTimestampAdjustment;
/* package */ long sampleTimestampOffsetUs;
private long timestampOffsetUs;
private long lastPts;
// Accessed by both the loading and consuming threads.
private volatile boolean prepared;
@ -75,12 +77,12 @@ public final class TsExtractor {
this.firstSampleTimestamp = firstSampleTimestamp;
this.samplePool = samplePool;
this.shouldSpliceIn = shouldSpliceIn;
pendingFirstSampleTimestampAdjustment = true;
tsPacketBuffer = new BitArray();
sampleQueues = new SparseArray<SampleQueue>();
tsPayloadReaders = new SparseArray<TsPayloadReader>();
tsPayloadReaders.put(TS_PAT_PID, new PatReader());
largestParsedTimestampUs = Long.MIN_VALUE;
lastPts = Long.MIN_VALUE;
}
/**
@ -294,6 +296,33 @@ public final class TsExtractor {
out.timeUs = in.timeUs;
}
/**
* Adjusts a PTS value to the corresponding time in microseconds, accounting for PTS wraparound.
*
* @param pts The raw PTS value.
* @return The corresponding time in microseconds.
*/
/* package */ long ptsToTimeUs(long pts) {
if (lastPts != Long.MIN_VALUE) {
// The wrap count for the current PTS may be closestWrapCount or (closestWrapCount - 1),
// and we need to snap to the one closest to lastPts.
long closestWrapCount = (lastPts + (MAX_PTS / 2)) / MAX_PTS;
long ptsWrapBelow = pts + (MAX_PTS * (closestWrapCount - 1));
long ptsWrapAbove = pts + (MAX_PTS * closestWrapCount);
pts = Math.abs(ptsWrapBelow - lastPts) < Math.abs(ptsWrapAbove - lastPts)
? ptsWrapBelow : ptsWrapAbove;
}
// Calculate the corresponding timestamp.
long timeUs = (pts * C.MICROS_PER_SECOND) / 90000;
// If we haven't done the initial timestamp adjustment, do it now.
if (lastPts == Long.MIN_VALUE) {
timestampOffsetUs = firstSampleTimestamp - timeUs;
}
// Record the adjusted PTS to adjust for wraparound next time.
lastPts = pts;
return timeUs + timestampOffsetUs;
}
/**
* Parses payload data.
*/
@ -482,7 +511,7 @@ public final class TsExtractor {
pesBuffer.skipBits(1);
pts |= pesBuffer.readBitsLong(15);
pesBuffer.skipBits(1);
timeUs = (pts * C.MICROS_PER_SECOND) / 90000;
timeUs = ptsToTimeUs(pts);
// Skip the rest of the header.
pesBuffer.skipBytes(headerDataLength - 5);
} else {
@ -690,7 +719,6 @@ public final class TsExtractor {
}
protected void addSample(Sample sample) {
adjustTimestamp(sample);
largestParsedTimestampUs = Math.max(largestParsedTimestampUs, sample.timeUs);
internalQueue.add(sample);
}
@ -703,14 +731,6 @@ public final class TsExtractor {
sample.size += size;
}
private void adjustTimestamp(Sample sample) {
if (pendingFirstSampleTimestampAdjustment) {
sampleTimestampOffsetUs = firstSampleTimestamp - sample.timeUs;
pendingFirstSampleTimestampAdjustment = false;
}
sample.timeUs += sampleTimestampOffsetUs;
}
}
/**