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Add ability to not offset in PtsTimestampAdjuster.

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Issue: #1078
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=111325745
This commit is contained in:
olly 2016-01-04 08:57:08 -08:00 committed by Oliver Woodman
parent 890dd5afb5
commit 18a39f3350
1 changed files with 12 additions and 5 deletions
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17
library/src/main/java/com/google/android/exoplayer/extractor/ts/PtsTimestampAdjuster.java
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@ -23,6 +23,12 @@ import com.google.android.exoplayer.C;
*/
public final class PtsTimestampAdjuster {
/**
* A special {@code firstSampleTimestampUs} value indicating that presentation timestamps should
* not be offset.
*/
public static final long DO_NOT_OFFSET = Long.MAX_VALUE;
/**
* The value one greater than the largest representable (33 bit) presentation timestamp.
*/
@ -35,7 +41,8 @@ public final class PtsTimestampAdjuster {
/**
* @param firstSampleTimestampUs The desired result of the first call to
* {@link #adjustTimestamp(long)}.
* {@link #adjustTimestamp(long)}, or {@link #DO_NOT_OFFSET} if presentation timestamps
* should not be offset.
*/
public PtsTimestampAdjuster(long firstSampleTimestampUs) {
this.firstSampleTimestampUs = firstSampleTimestampUs;
@ -57,9 +64,9 @@ public final class PtsTimestampAdjuster {
}
/**
* Scales and adjusts an MPEG-2 TS presentation timestamp.
* Scales and offsets an MPEG-2 TS presentation timestamp.
*
* @param pts The unscaled MPEG-2 TS presentation timestamp.
* @param pts The MPEG-2 TS presentation timestamp.
* @return The adjusted timestamp in microseconds.
*/
public long adjustTimestamp(long pts) {
@ -74,8 +81,8 @@ public final class PtsTimestampAdjuster {
}
// Calculate the corresponding timestamp.
long timeUs = ptsToUs(pts);
// If we haven't done the initial timestamp adjustment, do it now.
if (lastPts == Long.MIN_VALUE) {
if (firstSampleTimestampUs != DO_NOT_OFFSET && lastPts == Long.MIN_VALUE) {
// Calculate the timestamp offset.
timestampOffsetUs = firstSampleTimestampUs - timeUs;
}
// Record the adjusted PTS to adjust for wraparound next time.