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Support seeking in un-intearleaved tracks in Mp4Extractor

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A client can pass the id of the track on which they want to seek.

PiperOrigin-RevId: 437248055
This commit is contained in:
aquilescanta 2022-03-25 15:00:57 +00:00 committed by Ian Baker
parent acacb23ba6
commit 67acfc67de
1 changed files with 29 additions and 9 deletions
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38
libraries/extractor/src/main/java/androidx/media3/extractor/mp4/Mp4Extractor.java
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@ -281,6 +281,22 @@ public final class Mp4Extractor implements Extractor, SeekMap {
@Override
public SeekPoints getSeekPoints(long timeUs) {
return getSeekPoints(timeUs, /* trackId= */ C.INDEX_UNSET);
}
// Non-inherited public methods.
/**
* Equivalent to {@link SeekMap#getSeekPoints(long)}, except it adds the {@code trackId}
* parameter.
*
* @param timeUs A seek time in microseconds.
* @param trackId The id of the track on which to seek for {@link SeekPoints}. May be {@link
* C#INDEX_UNSET} if the extractor is expected to define the strategy for generating {@link
* SeekPoints}.
* @return The corresponding seek points.
*/
public SeekPoints getSeekPoints(long timeUs, int trackId) {
if (tracks.length == 0) {
return new SeekPoints(SeekPoint.START);
}
@ -290,9 +306,11 @@ public final class Mp4Extractor implements Extractor, SeekMap {
long secondTimeUs = C.TIME_UNSET;
long secondOffset = C.POSITION_UNSET;
// Note that the id matches the index in tracks.
int mainTrackIndex = trackId != C.INDEX_UNSET ? trackId : firstVideoTrackIndex;
// If we have a video track, use it to establish one or two seek points.
if (firstVideoTrackIndex != C.INDEX_UNSET) {
TrackSampleTable sampleTable = tracks[firstVideoTrackIndex].sampleTable;
if (mainTrackIndex != C.INDEX_UNSET) {
TrackSampleTable sampleTable = tracks[mainTrackIndex].sampleTable;
int sampleIndex = getSynchronizationSampleIndex(sampleTable, timeUs);
if (sampleIndex == C.INDEX_UNSET) {
return new SeekPoints(SeekPoint.START);
@ -312,13 +330,15 @@ public final class Mp4Extractor implements Extractor, SeekMap {
firstOffset = Long.MAX_VALUE;
}
// Take into account other tracks.
for (int i = 0; i < tracks.length; i++) {
if (i != firstVideoTrackIndex) {
TrackSampleTable sampleTable = tracks[i].sampleTable;
firstOffset = maybeAdjustSeekOffset(sampleTable, firstTimeUs, firstOffset);
if (secondTimeUs != C.TIME_UNSET) {
secondOffset = maybeAdjustSeekOffset(sampleTable, secondTimeUs, secondOffset);
if (trackId == C.INDEX_UNSET) {
// Take into account other tracks, but only if the caller has not specified a trackId.
for (int i = 0; i < tracks.length; i++) {
if (i != firstVideoTrackIndex) {
TrackSampleTable sampleTable = tracks[i].sampleTable;
firstOffset = maybeAdjustSeekOffset(sampleTable, firstTimeUs, firstOffset);
if (secondTimeUs != C.TIME_UNSET) {
secondOffset = maybeAdjustSeekOffset(sampleTable, secondTimeUs, secondOffset);
}
}
}
}